EP1840251B1 - Rotary dobby, weaving loom equipped with such a dobby and driving element for such a dobby - Google Patents

Rotary dobby, weaving loom equipped with such a dobby and driving element for such a dobby Download PDF

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Publication number
EP1840251B1
EP1840251B1 EP07356036A EP07356036A EP1840251B1 EP 1840251 B1 EP1840251 B1 EP 1840251B1 EP 07356036 A EP07356036 A EP 07356036A EP 07356036 A EP07356036 A EP 07356036A EP 1840251 B1 EP1840251 B1 EP 1840251B1
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EP
European Patent Office
Prior art keywords
finger
bisector
height
dobby
edges
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EP07356036A
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German (de)
French (fr)
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EP1840251A1 (en
Inventor
Jean-Pierre Pages
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Staubli Faverges SCA
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Staubli Faverges SCA
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Publication of EP1840251A1 publication Critical patent/EP1840251A1/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C1/00—Dobbies
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C1/00—Dobbies
    • D03C1/14—Features common to dobbies of different types
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C1/00—Dobbies
    • D03C1/14—Features common to dobbies of different types
    • D03C1/144—Features common to dobbies of different types linking to the heald frame

Definitions

  • the invention relates to a rotating dobby for the control of heald frames mounted on a loom, and to a loom equipped with such a dobby.
  • the invention also relates to a driving element belonging to such a dobby.
  • EP-A-0 851 046 EP-A-0 851 045 to equip a rotary dobby of an oscillating piece for each of its blades, this part being coupled to a heddle frame and associated with an eccentric mounted crazy on a main shaft of the dobby.
  • a movable ratchet makes it possible to couple a plate integral with the eccentric and carrying this member to a disc-shaped drive member, itself rotatably connected to the main shaft of the dobby.
  • this drive element is provided with two diametrically opposed notches in each of which can be received a finger belonging to the pawl. This finger comes, by its lateral faces, bearing against the edges of the notch in which it is engaged, which allows to drive the plate or to brake according to the movements of the drive element, itself even rotated by the main shaft of the dobby.
  • the rotating dobbies must be able to operate at higher and higher speeds, which has led to optimizing the zones of interaction between pivoting levers controlled by a device for reading the dobby and corresponding wedging surfaces formed on the tray, as is apparent from EP-A-0 851 046 . These arrangements are satisfactory.
  • the invention more particularly intends to remedy by proposing a new rotary dobby in which the premature wear of the parts in contact with the pawl and the driving element is greatly reduced or even eliminated.
  • This dobby is characterized in that the height of the orthogonal projection, on the bisector of the lateral faces of the finger or on the bisector of the edges of the notch, of the second interface is greater than the height of the orthogonal projection of the first interface. on the same bisector.
  • the area of the braking interface between the finger and the notch in which it is engaged can be relatively large, so that sliding under load at this interface, slip that occurs during finger extraction during braking of the drive element, is distributed over a relatively large area.
  • the contact pressure is lower and the wear of the movable member and the notches of the driving element is reduced compared to the dobbies of the prior art.
  • the height of the second interface projected on the bisector is greater than that of the first interface projected on the bisector allows that, during the extraction of the finger, the stroke of the movable member may remain of low amplitude, this is particularly advantageous because, during this movement, the inertia of the adjacent pivoting lever and that of the movable member must be overcome, as well as the effort due to the first means elastic.
  • the area of the first interface can be kept relatively low because the driving force is exerted without relative movement between the driving part and the driven part, which is less severe in terms of wear of the parts. that the sliding force obtained at the second interface during the extraction of the finger.
  • the movable member tilts under the effect of the first elastic means and the inertia of the moving parts is smaller than in the case of the extraction of the finger, so that the stroke of the movable member may, in this case, be greater than the stroke of clearance or extraction of the finger.
  • the invention therefore makes it possible to provide a gain in terms of performance for the dobby, without additional cost compared with existing solutions, especially those known from EP-A-0 851 046 . Indeed, this solution involves only local geometrical modifications of the moving parts, in contrast to a solution where one or more specific surface treatments would be applied, which would be costly and poorly adapted to the manufacturing in large series of metal parts. In addition, the control modes of moving parts are not questioned by the invention.
  • the height of the orthogonal projection of the second edge on the bisector of the edges of each notch is greater than the height of the orthogonal projection of the first edge of the notch on the same bisector, the orthogonal projections of the lateral faces of the finger on the bisector of these faces having substantially the same height.
  • each notch is asymmetrical, its edge on the braking interface side being higher than its edge on the interface side engine.
  • the same drive element can be used in both directions of rotation of the dobby, provided to be returned to move from one direction to another.
  • the movable member or pawl is, for its part, identical and keeps the same position whatever the direction of rotation.
  • the end face of the finger of the movable member is at least partly substantially complementary to a portion of the outer radial surface of the driving element in the vicinity of the second edge of each of its notches, which allows the finger to slide easily on the outer radial surface of the drive element before entering the notch.
  • the height of the orthogonal projection of the second lateral face of the finger on the bisector of the lateral faces of this finger is greater than the height of the orthogonal projection of the first lateral face of the finger.
  • the orthogonal projections of the edges of the notches on the bisector of these edges having substantially the same height.
  • the drive device can be used in the same position, regardless of the direction of rotation of the shaft, two different types of movable members being used depending on the direction of rotation of the shaft. training.
  • the height of the orthogonal projection of the second edge, on the bisector of the edges of each notch is greater than the height of the orthogonal projection of the first edge of the notch on the same bisector, while the The height of the orthogonal projection of the second lateral face of the finger on the bisector of the lateral faces of this finger is greater than the height of the orthogonal projection of its first lateral face on the bisector of these faces.
  • the radial height of the interfaces is optimized, an adaptation of the movable member and the drive element in the direction of rotation of the shaft.
  • the end face of the finger of the movable member may be substantially complementary to the bottom of the notch.
  • the bisector of the first and second lateral faces of the finger and / or the bisector of the first and second edges of each notch is or are merged with a radial radius by relative to the geometric axis of rotation of the drive shaft.
  • these faces and these edges may be parallel to such a radius which is then coincident with the aforesaid bisectors.
  • each notch may comprise a rounded central relief of support of the end face of the movable member.
  • the invention also relates to a loom equipped with a dobby as described above.
  • a loom is more reliable and easier to maintain than those of the state of the art.
  • the invention finally relates to a driving element belonging to a dobby as mentioned above and, more specifically, to a driving element provided with two notches intended to selectively receive a finger belonging to a mobile coupling member carried by the plateau, while the height of the orthogonal projection of an edge of each notch intended to transmit to the finger a braking force of the plateau on the bisector of the edges of this notch is greater than the height of the orthogonal projection, on the same bisector, an edge of each notch for transmitting to the finger a drive motor drive in rotation of the plate.
  • the dobby R represented at Figures 1 to 3 comprises a main shaft 1 animated by an intermittent rotation movement, with stopping every half-turn.
  • This shaft receives bearings 1a in number equal to that of the heald frames or blades of the craft.
  • On each bearing 1a is mounted idler an eccentric 2 secured laterally to a plate 3.
  • Around each eccentric 2 is mounted, with the interposition of a bearing 2a, a connecting rod 4 whose free end 4a is coupled to a pivoting arm 5 which ensures, thanks to a connection rods 6a, the vertical movement of the heald frame or blade 6 considered.
  • This framework is very schematically represented in the figure 1 .
  • the trade M thus comprises the dobby R represented on the left of the figure 1 , as well as several frames of the frame type 6, each frame being moved according to a vertical oscillations movement represented by the double arrow F 1 , by a lever 5, itself actuated by a connecting rod 4.
  • X 1 denotes the longitudinal geometric axis of the shaft 1, this axis constituting the axis of rotation of this shaft.
  • the shaft 1 carries a drive member 7 of elongate shape and whose central opening is substantially circular and centered on an axis X 7 .
  • the central opening of the member 7 is provided with two teeth 71 engaged in longitudinal grooves of corresponding shape formed at the periphery of the shaft 1.
  • the axes X 1 and X 7 are merged.
  • the member 7 is integral in rotation with the shaft 1.
  • the member 7 is provided with two notches 72 arranged on the same diameter D 1 of the shaft 1, symmetrical with respect to this diameter and intended to selectively receive a finger 81 of a pawl 8 articulated on an axis 9 carried by the plate 3 integral with the eccentric 2 corresponding.
  • a spring 10 tends to permanently recall the finger 81 of the pawl 8 towards the shaft 1, that is to say to engage the finger 81 in one of the notches 72 when disposed opposite this finger.
  • each lever 11 has a generally angled profile and is biased by a spring 13 in order to come into abutment with a shank 111 against a corresponding fixed abutment 14.
  • the shank 111 of each lever 11 can be selectively controlled by a pusher (not shown) reading, as represented by the arrows 15.
  • each lever 11 is provided with a spout 112 provided to cooperate with two wedging surfaces 31 and 32 formed at the periphery of the plate 3.
  • the spring 13 form an elastic means which tends to engage the nose 112 of each lever 11 with one of the two wedging surfaces 31 and 32. Thanks to the spouts 112 and surfaces 31 and 32, the plate 3 can be immobilized in two positions separated by a 180 ° rotation of the shaft 1. More specifically, the plate 3 can be immobilized in the position of the figure 1 or in a position in which the surface 31 cooperates with the spout 112 of the lever 11 shown on the left of this figure, while its surface 32 cooperates with the spout 112 of the lever shown on the right of this figure.
  • the springs 13 act on the levers 11 so that the nozzles 112 engage with the surfaces 31 and 32 when they arrive opposite the one of these spouts due to the rotation of the shaft 1.
  • This has the effect of exerting on a tail 82 of the pawl 8 a centripetal force F 2 which rotates the pawl in the direction of the arrow F 3 to the figure 1 , against the action of the spring 10.
  • the finger 81 is thus clear of the notch 72 in which it was previously introduced.
  • This engagement of the nozzles 112 with the surfaces 31 and 32 has the effect of immobilizing the plate 3 angularly and with it the eccentric 2 and the connecting rod 4 which are integral in rotation of this plate.
  • the member 7 can therefore be driven over a 180 ° stroke by the shaft 1, without itself driving the plate 3, the eccentric 2 and the connecting rod 4.
  • the rotational movement F 4 of the member 7 around the axis X 1 is transmitted to the finger 81 at an interface I 1 through which passes a motor force F 5 of the member 7 to the finger 81
  • This force is exerted by a first edge 721 of the notch 72 against which is supported a flat lateral face 811 of the finger 81.
  • the interface I 1 is formed by the portions bearing the edge 721 and the face 811. It constitutes a "motor" interface for driving the pawl 8 and elements 2, 3 and 4 associated.
  • the thickness of the edge 721 and the face 811 perpendicular to the plane of the figure 2 is limited by the width available for the placement of elements 7 and 2 in the division of the trade, this division being generally between 10 and 20 mm. It is therefore not possible to act on this width to increase the contact area between the edge 721 and the face 811. However, this area can be relatively small since the effort F 5 is a variable effort which is exercised while the edge 721 remains fixed relative to the face 811, when the member 7 drives the pawl 8.
  • the finger 81 also carries, by a flat lateral face 812 opposite the face 811, against a second edge 722 of the notch 72, this at an interface I 2 at which a braking force F 6 is transmitted.
  • the interface I 2 thus constitutes a braking interface between the pawl 8 and the member 7.
  • the faces 811 and 812 and the edges 721 and 722 are shown as not being supported, which is the case in certain phases of movement due to possible functional gaps.
  • the interfaces I 1 and I 2 extend over the height of the plane portions of the faces 811 and 812 and the edges 721 and 722 which are capable of coming into surface abutment against each other.
  • B 1 is the bisector of faces 811 and 812.
  • B 2 is the bisector of the plane portions of edges 721 and 722.
  • these bisectors are merged with each other and with a radius R 1 radial to the axis X 1 and passing equidistant from the faces 811 and 812.
  • the finger 81 When the force F 6 is applied, that is to say while the elements 1 and 7 are being decelerated, the finger 81 begins to be removed from the notch 72, in the direction of the arrow F 7 to the figure 2 , which induces a sliding under load of the face 812 against the edge 722, in the direction of the arrow F 8 to the figure 2 .
  • the height H 1 of the orthogonal projection I ' 1 of the interface I 1 on the bisector B 1 is not increased so as not to hinder the disengagement movement F 7 of the finger 81 when it is appropriate to to extract from the notch 72 under the effect of the force F 2 .
  • the performance of the extraction control remains the same when the race and the extraction rate remain unchanged.
  • the performance of the extraction control is not reduced.
  • the height H 2 is greater than the height H 1 . Taking into account the fact that the thickness of the parts 7 and 8 is uniform, this induces that the interface I 2 has an area greater than the interface I 1 , which allows optimized transmission of the forces at the time when the driving of the pawl 8 by the member 7 and during the release or extraction of the finger 81 relative to the notch 72.
  • edges 721 and 722 of the notch 72 are generally parallel to each other and to the bisector B 2 .
  • the lateral faces 811 and 812 of the finger 81 are parallel to each other and to the bisector B 1 .
  • each notch 72 has a relief in the form of a rounded boss 724, formed in its central part and against which the face 813.
  • the dobby is in the configuration of the figure 3 .
  • the face 813 is configured to slide then on the outer radial surface 73 of the member 7 in the direction of the arrow F 9 , before the finger 81 is engaged in the notch 72 under the effect of the elastic force of spring 10, this as soon as the notch 72 reaches opposite this finger 81.
  • the face 813 is substantially complementary to the surface 73 in its adjacent portion of the edge 722 of each notch.
  • only part of the face 813 may be substantially complementary to the surface 73.
  • the difference in the radial heights H 2 and H 1 is related to the fact that the orthogonal projection of the edge 722 on the bisector B 2 has a height h 2 greater than the height h 1 of the orthogonal projection of the edge 721 on this bisector B 2 .
  • the orthogonal projections of the faces 811 and 812 on the bisector B 1 have heights h ' 1 and h' 2 substantially equal.
  • a dobby R is partially represented. This dobby comprises elements similar to elements 2, 4, 5 and 11 to 14 of the first embodiment which are not shown.
  • the drive shaft 1 of this dobby is integral in rotation with a drive disk 7 having substantially the same function as the member 7 of the first embodiment but which is generally shaped circular disc centered on the axis X 1 of rotation of the shaft 1.
  • the disc 7 is provided with four teeth 71 for securing in rotation with the shaft 1 and two notches 72 diametrically opposed along a radius D 1 perpendicular to the X axis 1 of rotation of the shaft 1.
  • a pawl 8 is pivotally mounted on an axis 9 carried by a plate 3, this pawl 8 being subjected to the action of a spring 10 tending to engage a finger 81 of the ratchet in one of the notches 72.
  • the shaft 1 rotates clockwise at the figure 5 , as represented by the arrow F 4 , that is to say in a direction opposite to the direction of rotation of the shaft 1 to Figures 1 to 3 .
  • the transmission interface of the motor force F 5 between the disk 7 and the finger 81 is respectively denoted I 1 , this interface being defined between a first flat lateral surface 811 of the finger 81 and a first edge 721 of the notch 72.
  • I 2 note the braking interface between a second flat lateral face 812 of the finger 81 and a second edge 722 of the notch 72, the braking force F 6 of the finger 81 being exerted at this interface to the end of 180 ° rotation of the shaft 1.
  • the orthogonal projection I ' 2 of the interface I 2 on the bisectors B 1 and B 2 has a height H 2 greater than the height H 1 of the orthogonal projection I' 1 of the interface I 1 on these bisectors.
  • the orthogonal projections on the bisector B 2 of the edges 721 and 722 have substantially the same radial height, h 1 and h 2 , whereas the height h 2 of the orthogonal projection of the face 812 on the bisector B 1 is greater than the height h ' 1 of the orthogonal projection of the face 811 on this bisector B 1 .
  • H 2 , h 1 , h 2 and h ' 2 are substantially equal while the values of H 1 and h' 1 are equal to and lower than the previous ones.
  • the bottom 723 of the notch 72 is generally perpendicular to the edges 721 and 722, while the end face 813 of the finger 81 is inclined relative to a median radius R 1 between the faces 811 and 812 which are parallel to each other and at this radius, as well as the edges 721 and 722.
  • This embodiment has the advantage that a same drive disk can be used regardless of the direction of rotation F 4 of the shaft 1. Only the pawl 8 must be adapted by a corresponding distribution of its first side face 811 and its second side face 812 which respectively define the interfaces I 1 and I 2 .
  • the orthogonal projections I ' 1 and I' 2 , on the bisectors B 1 and B 2 defined as above, interfaces I 1 and I 2 , defined as above, have different heights, the height H 2 of the projection I ' 2 being greater than the height H 1 of the projection I ' 1 .
  • This embodiment differs from the previous embodiment in that the end face 813 of the finger 81 is substantially complementary in shape to the bottom 723 of the notch 72.
  • the heights H 2 , h 2 and h ' 2 are equal to each other, while the heights H 1 , h 1 and h' 1 are equal to each other and lower than the previous ones.
  • the side faces 811 and 812 of the finger 81 are parallel to each other and to the bisector B 1
  • the edges 721 and 722 of the notch 72 are parallel to each other and to the bisector B 2 .
  • the member 7 of the first embodiment may be disk-shaped and the disk 7 of the second embodiment may be oblong.
  • a relief of the type of the bump 724 can be provided in all embodiments to receive in support the finger 81.
  • the bisectors B 1 and B 2 are combined when the finger 81 is engaged in a notch 72. However, this is not mandatory. In addition, it is not mandatory for the bisectors B 1 and B 2 to be confused with a radial radius at the axis X 1 .
  • the invention has been shown with a finger 81 whose side faces 811 and 812 are flat and notches 72 whose edges 721 and 722 are straight. These faces and / or these edges may be curved, it being understood that the contact interfaces are then not strictly linear but surface based on surface pressures.
  • the bisectors and the orthogonal projections of these interfaces are then defined in a manner analogous to those mentioned above.
  • an average line is defined, for example a cord of an arc of a circle or a tangent in a central zone of these edges or faces, as representative of the orientation of these edges or faces. From such average lines, a bisector is defined as before.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Looms (AREA)
  • Catching Or Destruction (AREA)
  • Woven Fabrics (AREA)
  • Transmission Devices (AREA)

Abstract

The rotating dobby for weaving loom, comprises blades, an oscillating part fixed with a harness and associated with an actuating element mounted on a main shaft of the dobby, and a movable coupling body carried by a tray integrated with a coupling element. The movable body is subjected to first elastic means for operating an angular joint of the plate with a driving element (7) rotating with main shaft, where the driving element is equipped with notches (72) diametrically opposed to finger plate of the coupling body. The finger plate is contacted with edges of the notches. The rotating dobby for weaving loom, comprises blades, an oscillating part fixed with a harness and associated with an actuating element mounted on a main shaft of the dobby, and a movable coupling body carried by a tray integrated with the coupling element. The movable body is subjected to first elastic means for operating an angular joint of the plate with a driving element (7) rotating with main shaft, where the driving element is equipped with notches (72) diametrically opposed to finger plate of the coupling body. The finger plate is contacted with edges of the notches in which the finger is engaged at a first interface defined between a first lateral side of the finger and a first edge of the notch and engaged at a second interface defined between a second lateral side of the finger and a second edge of the notch. A braking effort and a motive force for rotating the tray is transmitted to the movable body. A height of an orthogonal projection of the second interface on a bisector of lateral sides (811, 812) of the finger or on a bisector of edges (721, 722) of the notch is greater than a height of an orthogonal projection of the first interface on the same bisector. A height of the orthogonal projection of the second edge on the bisector of edges of each notch is greater than a radial height of the orthogonal projection of first edge of the notch on the same bisector. The orthogonal projections of lateral sides of finger on the bisector and orthogonal projections of edges of notches on the bisector have substantially same height. A side end of finger of the movable body is complementary of a portion of an external radial surface of the driving element in a vicinity of the second edge of each of its notches, and complementary of a base of the notch. A height of the orthogonal projection of second lateral side of the finger on the bisector of lateral sides of that finger is greater than a height of the orthogonal projection of the first lateral side of the finger on the same bisector. The bisector of first and second lateral sides of the finger and/or bisector of first and second edges of each notch are merged with a radius with respect to a geometric axis of rotation of a driving shaft. The first and second lateral sides of the finger and first and second edges of each notch are parallel to radius with respect to the geometric axis of rotation of the driving shaft and are merged with the bisectors of sides of the finger and edges of the notch. Independent claims are included for: (1) a weaving loom; and (2) a driving element.

Description

L'invention a trait à une ratière rotative pour la commande des cadres de lisses montés sur un métier à tisser, ainsi qu'à un métier à tisser équipé d'une telle ratière. L'invention concerne également un élément d'entraînement appartenant à une telle ratière.The invention relates to a rotating dobby for the control of heald frames mounted on a loom, and to a loom equipped with such a dobby. The invention also relates to a driving element belonging to such a dobby.

Il est connu de EP-A-0 851 046 ; EP-A-0 851 045 d'équiper une ratière rotative d'une pièce oscillante pour chacune de ses lames, cette pièce étant attelée à un cadre de lisses et associée à un excentrique monté fou sur un arbre principal de la ratière. Un cliquet mobile permet d'accoupler un plateau solidaire de l'excentrique et portant cet organe à un élément d'entraînement en forme de disque, lui-même solidaire en rotation de l'arbre principal de la ratière. Pour ce faire, cet élément d'entraînement est pourvu de deux encoches diamétralement opposées dans chacune desquelles peut être reçu un doigt appartenant au cliquet. Ce doigt vient, par ses faces latérales, en appui contre les bords de l'encoche dans laquelle il est engagé, ce qui permet d'entraîner le plateau ou de le freiner en fonction des mouvements de l'élément d'entraînement, lui-même mis en rotation par l'arbre principal de la ratière.It is known to EP-A-0 851 046 ; EP-A-0 851 045 to equip a rotary dobby of an oscillating piece for each of its blades, this part being coupled to a heddle frame and associated with an eccentric mounted crazy on a main shaft of the dobby. A movable ratchet makes it possible to couple a plate integral with the eccentric and carrying this member to a disc-shaped drive member, itself rotatably connected to the main shaft of the dobby. To do this, this drive element is provided with two diametrically opposed notches in each of which can be received a finger belonging to the pawl. This finger comes, by its lateral faces, bearing against the edges of the notch in which it is engaged, which allows to drive the plate or to brake according to the movements of the drive element, itself even rotated by the main shaft of the dobby.

Les ratières rotatives doivent pouvoir fonctionner à des vitesses de plus en plus élevées, ce qui a conduit à optimiser les zones d'interactions entre des leviers pivotants commandés par un dispositif de lisage de la ratière et des surfaces de coincement correspondantes ménagées sur le plateau, ainsi que cela ressort de EP-A-0 851 046 . Ces aménagements donnent satisfaction.The rotating dobbies must be able to operate at higher and higher speeds, which has led to optimizing the zones of interaction between pivoting levers controlled by a device for reading the dobby and corresponding wedging surfaces formed on the tray, as is apparent from EP-A-0 851 046 . These arrangements are satisfactory.

Toutefois, on a pu relever une usure des encoches et du doigt du cliquet précités du fait des introductions/extractions répétées de ce doigt dans ces encoches. En particulier, lors de la décélération de l'arbre d'entraînement, lorsque celui-ci parvient au voisinage de l'une de ces deux positions d'arrêt décalées angulairement de 180°, le doigt du cliquet et l'élément d'entraînement sont en contact par une face latérale du doigt et un bord de l'encoche dans laquelle il est engagé. Pour extraire le doigt du cliquet, on doit procéder par glissement sous charge de ces surfaces car l'extraction du doigt est amorcée avant l'arrêt de l'arbre principal. Plus la vitesse de rotation augmente, plus les efforts subis par ces surfaces et les vitesses d'extraction sont importants, ce qui favorise l'usure mentionnée ci-dessus.However, it has been possible to note a wear of the notches and the ratchet finger mentioned above because of repeated introductions / extractions of this finger into these notches. In particular, during the deceleration of the drive shaft, when it reaches the vicinity of one of these two staggered stopping positions angularly 180 °, the ratchet finger and the driving element are in contact by a lateral face of the finger and an edge of the notch in which it is engaged. To extract the finger from the pawl, one must proceed by sliding under load of these surfaces because the extraction of the finger is initiated before stopping the main shaft. The higher the speed of rotation, the greater the forces on these surfaces and the extraction speeds are important, which promotes the wear mentioned above.

Une telle usure limite en pratique les performances de la ratière car elle est susceptible d'entraîner des dysfonctionnements tels qu'une éjection intempestive du doigt du cliquet par rapport à l'encoche, alors que l'arbre et l'élément d'entraînement sont en cours de rotation. Ceci provoque l'arrêt du mouvement de la lame dans une position intermédiaire et peut générer la casse de certains fils de chaîne et une faute dans le motif en cours de tissage.Such wear in practice limits the performance of the dobby because it is likely to cause malfunctions such as inadvertent ejection of the ratchet finger relative to the notch, while the shaft and the driving element are in rotation. This causes the movement of the blade to stop in an intermediate position and can cause the breakage of certain warp threads and a fault in the pattern being woven.

C'est à ces inconvénients qu'entend plus particulièrement remédier l'invention en proposant une nouvelle ratière rotative dans laquelle l'usure prématurée des parties en contact du cliquet et de l'élément d'entraînement est fortement diminuée, voire supprimée.It is to these drawbacks that the invention more particularly intends to remedy by proposing a new rotary dobby in which the premature wear of the parts in contact with the pawl and the driving element is greatly reduced or even eliminated.

A cet effet, l'invention concerne une ratière rotative pour un métier à tisser, cette ratière comprenant pour chacune de ses lames :

  • une pièce oscillante attelée à un cadre de lisse et associée à un élément d'actionnement monté fou sur un arbre principal de la ratière,
  • un organe mobile d'accouplement porté par un plateau solidaire de l'élément d'actionnement, cet organe mobile étant soumis à des premiers moyens élastiques pour opérer la liaison angulaire du plateau avec un élément d'entraînement solidaire en rotation de l'arbre principal et pourvu de deux encoches diamétralement opposées de réception d'un doigt de l'organe d'accouplement, ce doigt étant apte à venir en contact avec les bords d'une encoche dans laquelle il est engagé au niveau d'une première interface, définie entre une première face latérale du doigt et un premier bord de l'encoche et par laquelle est transmis à l'organe mobile un effort moteur d'entraînement en rotation du plateau, et d'une seconde interface, définie entre une deuxième face latérale du doigt et un deuxième bord de l'encoche et par laquelle est transmis à l'organe mobile un effort de freinage du plateau.
For this purpose, the invention relates to a rotating dobby for a loom, this dobby comprising for each of its blades:
  • an oscillating piece coupled to a heddle frame and associated with an actuating element mounted idly on a main shaft of the dobby,
  • a movable coupling member carried by a plate integral with the actuating element, this movable member being subjected to first resilient means for operating the angular connection of the plate with a drive element integral in rotation with the main shaft and provided with two diametrically opposed notches of receiving a finger of the coupling member, said finger being adapted to come into contact with the edges of a notch in which it is engaged at a first interface, defined between a first lateral face of the finger and a first edge of the notch and through which is transmitted to the movable member a drive motor drive in rotation of the plate, and a second interface, defined between a second side face of the finger and a second edge of the notch and by which is transmitted to the movable member a brake force of the plate.

Cette ratière est caractérisée en ce que la hauteur de la projection orthogonale, sur la bissectrice des faces latérales du doigt ou sur la bissectrice des bords de l'encoche, de la seconde interface est supérieure à la hauteur de la projection orthogonale de la première interface sur la même bissectrice.This dobby is characterized in that the height of the orthogonal projection, on the bisector of the lateral faces of the finger or on the bisector of the edges of the notch, of the second interface is greater than the height of the orthogonal projection of the first interface. on the same bisector.

Grâce à l'invention, l'aire de l'interface de freinage entre le doigt et l'encoche dans laquelle il est engagé peut être relativement importante, de sorte que le glissement sous charge au niveau de cette interface, glissement qui se produit lors de l'extraction du doigt pendant le freinage de l'élément d'entraînement, est réparti sur une surface relativement importante. Ainsi, la pression de contact est plus faible et l'usure de l'organe mobile et des encoches de l'élément d'entraînement est diminuée par rapport aux ratières de l'art antérieur. Le fait que la hauteur de la seconde interface projetée sur la bissectrice est plus importante que celle de la première interface projetée sur la bissectrice permet que, lors de l'extraction du doigt, la course de l'organe mobile peut demeurer de faible amplitude, ce qui est particulièrement avantageux car, lors de ce mouvement, l'inertie du levier pivotant voisin et celle de l'organe mobile doivent être vaincues, de même que l'effort dû aux premiers moyens élastiques. L'aire de la première interface peut être conservée avec une valeur relativement faible car l'effort moteur d'entraînement s'exerce sans mouvement relatif entre la pièce menante et la pièce menée, ce qui est moins sévère en termes d'usure des pièces que l'effort de glissement obtenu au niveau de la seconde interface lors de l'extraction du doigt. Lorsque le doigt doit être introduit dans l'une des encoches, l'organe mobile bascule sous l'effet des premiers moyens élastiques et l'inertie des pièces en mouvement est plus faible que dans le cas de l'extraction du doigt, de sorte que la course de l'organe mobile peut, dans ce cas, être plus importante que la course de dégagement ou d'extraction du doigt.Thanks to the invention, the area of the braking interface between the finger and the notch in which it is engaged can be relatively large, so that sliding under load at this interface, slip that occurs during finger extraction during braking of the drive element, is distributed over a relatively large area. Thus, the contact pressure is lower and the wear of the movable member and the notches of the driving element is reduced compared to the dobbies of the prior art. The fact that the height of the second interface projected on the bisector is greater than that of the first interface projected on the bisector allows that, during the extraction of the finger, the stroke of the movable member may remain of low amplitude, this is particularly advantageous because, during this movement, the inertia of the adjacent pivoting lever and that of the movable member must be overcome, as well as the effort due to the first means elastic. The area of the first interface can be kept relatively low because the driving force is exerted without relative movement between the driving part and the driven part, which is less severe in terms of wear of the parts. that the sliding force obtained at the second interface during the extraction of the finger. When the finger must be introduced into one of the notches, the movable member tilts under the effect of the first elastic means and the inertia of the moving parts is smaller than in the case of the extraction of the finger, so that the stroke of the movable member may, in this case, be greater than the stroke of clearance or extraction of the finger.

L'invention permet donc d'apporter un gain en termes de performance pour la ratière, sans surcoût par rapport aux solutions existantes, notamment celles connues de EP-A-0 851 046 . En effet, cette solution n'implique que des modifications géométriques locales des pièces en mouvement, à l'inverse d'une solution où l'on appliquerait un ou plusieurs traitements de surface spécifiques, ce qui serait coûteux et mal adapté à la fabrication en grande série de pièces métalliques. En outre, les modes de commande des pièces en mouvement ne sont pas remis en question par l'invention.The invention therefore makes it possible to provide a gain in terms of performance for the dobby, without additional cost compared with existing solutions, especially those known from EP-A-0 851 046 . Indeed, this solution involves only local geometrical modifications of the moving parts, in contrast to a solution where one or more specific surface treatments would be applied, which would be costly and poorly adapted to the manufacturing in large series of metal parts. In addition, the control modes of moving parts are not questioned by the invention.

Selon un premier mode de réalisation avantageux de l'invention, la hauteur de la projection orthogonale du deuxième bord sur la bissectrice des bords de chaque encoche est supérieure à la hauteur de la projection orthogonale du premier bord de l'encoche sur la même bissectrice, les projections orthogonales des faces latérales du doigt sur la bissectrice de ces faces ayant sensiblement la même hauteur. En d'autres termes, chaque encoche est dissymétrique, son bord du côté interface de freinage étant plus haut que son bord du côté interface moteur. Le même élément d'entraînement peut être utilisé dans les deux sens de rotation de la ratière, à condition d'être retourné pour passer d'un sens à l'autre. L'organe mobile ou cliquet est, quant à lui, identique et garde la même position quel que soit le sens de rotation. On peut, en outre, prévoir que la face d'extrémité du doigt de l'organe mobile est au moins en partie sensiblement complémentaire d'une portion de la surface radiale externe de l'élément d'entraînement au voisinage du deuxième bord de chacune de ses encoches, ce qui permet que le doigt glisse facilement sur la surface radiale externe de l'élément d'entraînement avant de pénétrer dans l'encoche.According to a first advantageous embodiment of the invention, the height of the orthogonal projection of the second edge on the bisector of the edges of each notch is greater than the height of the orthogonal projection of the first edge of the notch on the same bisector, the orthogonal projections of the lateral faces of the finger on the bisector of these faces having substantially the same height. In other words, each notch is asymmetrical, its edge on the braking interface side being higher than its edge on the interface side engine. The same drive element can be used in both directions of rotation of the dobby, provided to be returned to move from one direction to another. The movable member or pawl is, for its part, identical and keeps the same position whatever the direction of rotation. It may further be provided that the end face of the finger of the movable member is at least partly substantially complementary to a portion of the outer radial surface of the driving element in the vicinity of the second edge of each of its notches, which allows the finger to slide easily on the outer radial surface of the drive element before entering the notch.

Selon un autre mode de réalisation avantageux de l'invention, la hauteur de la projection orthogonale de la deuxième face latérale du doigt sur la bissectrice des faces latérales de ce doigt est supérieure à la hauteur de la projection orthogonale de la première face latérale du doigt sur la même bissectrice, les projections orthogonales des bords des encoches sur la bissectrice de ces bords ayant sensiblement la même hauteur. Dans ce cas, le dispositif d'entraînement peut être utilisé dans la même position, quel que soit le sens de rotation de l'arbre, deux types d'organes mobiles différents étant utilisés en fonction du sens de rotation de l'arbre d'entraînement.According to another advantageous embodiment of the invention, the height of the orthogonal projection of the second lateral face of the finger on the bisector of the lateral faces of this finger is greater than the height of the orthogonal projection of the first lateral face of the finger. on the same bisector, the orthogonal projections of the edges of the notches on the bisector of these edges having substantially the same height. In this case, the drive device can be used in the same position, regardless of the direction of rotation of the shaft, two different types of movable members being used depending on the direction of rotation of the shaft. training.

Selon un autre mode de réalisation, la hauteur de la projection orthogonale du deuxième bord, sur la bissectrice des bords de chaque encoche, est supérieure à la hauteur de la projection orthogonale du premier bord de l'encoche sur la même bissectrice, alors que la hauteur de la projection orthogonale de la deuxième face latérale du doigt sur la bissectrice des faces latérales de ce doigt est supérieure à la hauteur de la projection orthogonale de sa première face latérale sur la bissectrice de ces faces. Dans ce cas, la hauteur radiale des interfaces est optimisée, moyennant une adaptation de l'organe mobile et de l'élément d'entraînement au sens de rotation de l'arbre. La face d'extrémité du doigt de l'organe mobile peut être sensiblement complémentaire du fond de l'encoche.According to another embodiment, the height of the orthogonal projection of the second edge, on the bisector of the edges of each notch, is greater than the height of the orthogonal projection of the first edge of the notch on the same bisector, while the The height of the orthogonal projection of the second lateral face of the finger on the bisector of the lateral faces of this finger is greater than the height of the orthogonal projection of its first lateral face on the bisector of these faces. In this case, the radial height of the interfaces is optimized, an adaptation of the movable member and the drive element in the direction of rotation of the shaft. The end face of the finger of the movable member may be substantially complementary to the bottom of the notch.

Quel que soit le mode de réalisation considéré et selon des aspects avantageux de l'invention, la bissectrice des premières et deuxièmes faces latérales du doigt et/ou la bissectrice des premiers et deuxièmes bords de chaque encoche est ou sont confondues avec un rayon radial par rapport à l'axe géométrique de rotation de l'arbre d'entraînement. En outre, ces faces et ces bords peuvent être parallèles à un tel rayon qui est alors confondu avec les bissectrices précitées.Whatever the embodiment considered and according to advantageous aspects of the invention, the bisector of the first and second lateral faces of the finger and / or the bisector of the first and second edges of each notch is or are merged with a radial radius by relative to the geometric axis of rotation of the drive shaft. In addition, these faces and these edges may be parallel to such a radius which is then coincident with the aforesaid bisectors.

En outre, le fond de chaque encoche peut comprendre un relief central arrondi d'appui de la face d'extrémité de l'organe mobile.In addition, the bottom of each notch may comprise a rounded central relief of support of the end face of the movable member.

L'invention concerne également un métier à tisser équipé d'une ratière telle que précédemment décrite. Un tel métier à tisser est plus fiable et plus aisé à entretenir que ceux de l'état de la technique.The invention also relates to a loom equipped with a dobby as described above. Such a loom is more reliable and easier to maintain than those of the state of the art.

L'invention concerne enfin un élément d'entraînement appartenant à une ratière telle que mentionné ci-dessus et, plus spécifiquement, un élément d'entraînement pourvu de deux encoches destinées à recevoir sélectivement un doigt appartenant à un organe mobile d'accouplement porté par le plateau, alors que la hauteur de la projection orthogonale d'un bord de chaque encoche destiné à transmettre au doigt un effort de freinage du plateau sur la bissectrice des bords de cette encoche est supérieure à la hauteur de la projection orthogonale, sur la même bissectrice, d'un bord de chaque encoche destiné à transmettre au doigt un effort moteur d'entraînement en rotation du plateau.The invention finally relates to a driving element belonging to a dobby as mentioned above and, more specifically, to a driving element provided with two notches intended to selectively receive a finger belonging to a mobile coupling member carried by the plateau, while the height of the orthogonal projection of an edge of each notch intended to transmit to the finger a braking force of the plateau on the bisector of the edges of this notch is greater than the height of the orthogonal projection, on the same bisector, an edge of each notch for transmitting to the finger a drive motor drive in rotation of the plate.

L'invention sera mieux comprise et d'autres avantages de celle-ci apparaîtront plus clairement à la lumière de la description de trois modes de réalisation d'une ratière et d'un métier à tisser conformes à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés dans lesquels :

  • la figure 1 est une représentation schématique de principe d'un métier à tisser conforme à l'invention comprenant une ratière conforme à l'invention ;
  • la figure 2 est une vue à plus grande échelle du détail II à la figure 1 ;
  • la figure 3 est une vue analogue à la figure 2, mais à plus petite échelle, lorsque la ratière est dans une autre configuration de fonctionnement ;
  • la figure 4 est une vue analogue à la figure 2 et représente le cas où l'arbre de la ratière est entraîné dans le sens opposé de celui représenté aux figures 1 à 3,
  • la figure 5 est une vue partielle d'une ratière conforme à un second mode de réalisation de l'invention ;
  • la figure 6 est une vue à plus grande échelle du détail VI à la figure 5 et
  • la figure 7 est une vue analogue à la figure 6 pour une ratière conforme à un troisième mode de réalisation de l'invention.
The invention will be better understood and other advantages thereof will appear more clearly in the light of the description of three embodiments of a dobby and a loom according to its principle, given solely by way of example and with reference to the appended drawings in which:
  • the figure 1 is a schematic representation of a weaving loom according to the invention comprising a dobby according to the invention;
  • the figure 2 is a larger-scale view of detail II to the figure 1 ;
  • the figure 3 is a view similar to the figure 2 but on a smaller scale, when the dobby is in another operating configuration;
  • the figure 4 is a view similar to the figure 2 and represents the case where the dobby tree is driven in the opposite direction from that shown in Figures 1 to 3 ,
  • the figure 5 is a partial view of a dobby according to a second embodiment of the invention;
  • the figure 6 is a larger-scale view of detail VI to the figure 5 and
  • the figure 7 is a view similar to the figure 6 for a dobby according to a third embodiment of the invention.

La ratière R représentée aux figures 1 à 3 comprend un arbre principal 1 animé d'un mouvement de rotation intermittent, avec arrêt tous les demi-tours. Cet arbre reçoit des roulements 1a en nombre égal à celui des cadres de lisses ou lames du métier. Sur chaque roulement 1a est monté fou un excentrique 2 solidaire latéralement d'un plateau 3. Autour de chaque excentrique 2 est monté, avec interposition d'un roulement 2a, une bielle 4 dont l'extrémité libre 4a est attelée à un bras pivotant 5 qui assure, grâce à une liaison par bielles 6a, le déplacement vertical du cadre de lisses ou lame 6 considéré. Ce cadre est représenté de façon très schématique à la figure 1.The dobby R represented at Figures 1 to 3 comprises a main shaft 1 animated by an intermittent rotation movement, with stopping every half-turn. This shaft receives bearings 1a in number equal to that of the heald frames or blades of the craft. On each bearing 1a is mounted idler an eccentric 2 secured laterally to a plate 3. Around each eccentric 2 is mounted, with the interposition of a bearing 2a, a connecting rod 4 whose free end 4a is coupled to a pivoting arm 5 which ensures, thanks to a connection rods 6a, the vertical movement of the heald frame or blade 6 considered. This framework is very schematically represented in the figure 1 .

Le métier M comprend donc la ratière R représentée sur la gauche de la figure 1, ainsi que plusieurs cadres du type du cadre 6, chaque cadre étant déplacé selon un mouvement d'oscillations verticales représenté par la double flèche F1, par un levier 5, lui-même actionné par une bielle 4.The trade M thus comprises the dobby R represented on the left of the figure 1 , as well as several frames of the frame type 6, each frame being moved according to a vertical oscillations movement represented by the double arrow F 1 , by a lever 5, itself actuated by a connecting rod 4.

On note X1 l'axe géométrique longitudinal de l'arbre 1, cet axe constituant l'axe de rotation de cet arbre.X 1 denotes the longitudinal geometric axis of the shaft 1, this axis constituting the axis of rotation of this shaft.

Entre deux excentriques 2 contigus, l'arbre 1 porte un organe d'entraînement 7 de forme allongée et dont l'ouverture centrale est sensiblement circulaire et centrée sur un axe X7. L'ouverture centrale de l'organe 7 est pourvue de deux dents 71 engagées dans des rainures longitudinales de forme correspondante ménagées à la périphérie de l'arbre 1. En configuration montée de la ratière, les axes X1 et X7 sont confondus. Ainsi, l'organe 7 est solidaire en rotation de l'arbre 1. Par ailleurs, l'organe 7 est pourvu de deux encoches 72 disposées sur un même diamètre D1 de l'arbre 1, symétriques par rapport à ce diamètre et destinées à recevoir sélectivement un doigt 81 d'un cliquet 8 articulé sur un axe 9 porté par le plateau 3 solidaire de l'excentrique 2 correspondant. Un ressort 10 tend à rappeler en permanence le doigt 81 du cliquet 8 en direction de l'arbre 1, c'est-à-dire à engager ce doigt 81 dans l'une des encoches 72 lorsqu'elle est disposée en regard de ce doigt.Between two adjacent eccentrics 2, the shaft 1 carries a drive member 7 of elongate shape and whose central opening is substantially circular and centered on an axis X 7 . The central opening of the member 7 is provided with two teeth 71 engaged in longitudinal grooves of corresponding shape formed at the periphery of the shaft 1. In the mounted configuration of the dobby, the axes X 1 and X 7 are merged. Thus, the member 7 is integral in rotation with the shaft 1. Moreover, the member 7 is provided with two notches 72 arranged on the same diameter D 1 of the shaft 1, symmetrical with respect to this diameter and intended to selectively receive a finger 81 of a pawl 8 articulated on an axis 9 carried by the plate 3 integral with the eccentric 2 corresponding. A spring 10 tends to permanently recall the finger 81 of the pawl 8 towards the shaft 1, that is to say to engage the finger 81 in one of the notches 72 when disposed opposite this finger.

La commande du cliquet 8 associée à chaque lame 6 est assurée à l'aide de deux leviers pivotants 11 articulés chacun autour d'un axe fixe 12 parallèle à l'arbre 1. Chaque levier 11 présente un profil globalement en équerre et est sollicité par un ressort 13 afin de venir en appui par une queue 111 contre une butée fixe correspondante 14. La queue 111 de chaque levier 11 peut être sélectivement commandée par un poussoir non représenté d'un dispositif de lisage, comme représenté par les flèches 15. A l'opposé de sa queue 111, chaque levier 11 est pourvu d'un bec 112 prévu pour coopérer avec deux surfaces de coincement 31 et 32 ménagées à la périphérie du plateau 3. Le ressort 13 forme un moyen élastique qui tend à engager le bec 112 de chaque levier 11 avec l'une des deux surfaces de coincement 31 et 32. Grâce aux becs 112 et aux surfaces 31 et 32, le plateau 3 peut être immobilisé dans deux positions séparées par une rotation de 180° de l'arbre 1. Plus précisément, le plateau 3 peut être immobilisé dans la position de la figure 1 ou dans une position dans laquelle la surface 31 coopère avec le bec 112 du levier 11 représenté sur la gauche de cette figure, alors que sa surface 32 coopère avec le bec 112 du levier représenté sur la droite de cette figure.The control of the pawl 8 associated with each blade 6 is provided by means of two pivoting levers 11 articulated each around a fixed axis 12 parallel to the shaft 1. Each lever 11 has a generally angled profile and is biased by a spring 13 in order to come into abutment with a shank 111 against a corresponding fixed abutment 14. The shank 111 of each lever 11 can be selectively controlled by a pusher (not shown) reading, as represented by the arrows 15. In contrast to its tail 111, each lever 11 is provided with a spout 112 provided to cooperate with two wedging surfaces 31 and 32 formed at the periphery of the plate 3. The spring 13 form an elastic means which tends to engage the nose 112 of each lever 11 with one of the two wedging surfaces 31 and 32. Thanks to the spouts 112 and surfaces 31 and 32, the plate 3 can be immobilized in two positions separated by a 180 ° rotation of the shaft 1. More specifically, the plate 3 can be immobilized in the position of the figure 1 or in a position in which the surface 31 cooperates with the spout 112 of the lever 11 shown on the left of this figure, while its surface 32 cooperates with the spout 112 of the lever shown on the right of this figure.

En l'absence d'action sur la queue 111 des leviers 11 par le dispositif de lisage, les ressorts 13 agissent sur les leviers 11 pour que les becs 112 s'engagent avec les surfaces 31 et 32 lorsqu'elles parviennent en regard de l'un de ces becs du fait de la rotation de l'arbre 1. Ceci a pour effet d'exercer sur une queue 82 du cliquet 8 un effort centripète F2 qui fait pivoter le cliquet dans le sens de la flèche F3 à la figure 1, à l'encontre de l'action du ressort 10. Le doigt 81 est ainsi dégagé de l'encoche 72 dans laquelle il était précédemment introduit. Cet engagement des becs 112 avec les surfaces 31 et 32 a pour effet d'immobiliser angulairement le plateau 3 et avec lui l'excentrique 2 et la bielle 4 qui sont solidaires en rotation de ce plateau. L'organe 7 peut donc être entraîné sur une course de 180° par l'arbre 1, sans entraîner lui-même le plateau 3, l'excentrique 2 et la bielle 4.In the absence of action on the shank 111 of the levers 11 by the reading device, the springs 13 act on the levers 11 so that the nozzles 112 engage with the surfaces 31 and 32 when they arrive opposite the one of these spouts due to the rotation of the shaft 1. This has the effect of exerting on a tail 82 of the pawl 8 a centripetal force F 2 which rotates the pawl in the direction of the arrow F 3 to the figure 1 , against the action of the spring 10. The finger 81 is thus clear of the notch 72 in which it was previously introduced. This engagement of the nozzles 112 with the surfaces 31 and 32 has the effect of immobilizing the plate 3 angularly and with it the eccentric 2 and the connecting rod 4 which are integral in rotation of this plate. The member 7 can therefore be driven over a 180 ° stroke by the shaft 1, without itself driving the plate 3, the eccentric 2 and the connecting rod 4.

Au contraire, si le dispositif de lisage exerce sur le levier 11 dont le bec 112 est en prise avec la surface 31 un effort dans le sens d'une des flèches 15, le bec 112 de ce levier s'écarte de la surface 31 et le doigt 81 du cliquet 8 demeure en prise dans l'encoche 72 dans laquelle il est engagé, ce qui permet à l'organe 7 qui tourne dans le sens de la flèche F4 d'entraîner les éléments 8, 3, 2 et 4 autour de l'axe X1, dans le même sens.On the contrary, if the reading device exerts on the lever 11 whose spout 112 is engaged with the surface 31 a force in the direction of one of the arrows 15, the spout 112 of this lever deviates from the surface 31 and the finger 81 of the pawl 8 remains engaged in the notch 72 in which it is engaged, which allows the member 7 which rotates in the direction of the arrow F 4 d driving the elements 8, 3, 2 and 4 around the axis X 1 , in the same direction.

Comme il ressort plus particulièrement de la figure 2, le mouvement de rotation F4 de l'organe 7 autour de l'axe X1 est transmis au doigt 81 au niveau d'une interface I1 à travers laquelle passe un effort moteur F5 de l'organe 7 vers le doigt 81. Cet effort est exercé par un premier bord 721 de l'encoche 72 contre lequel est en appui une face latérale plane 811 du doigt 81. L'interface I1 est formée par les portions en appui du bord 721 et de la face 811. Elle constitue une interface « moteur » pour l'entraînement du cliquet 8 et des éléments 2, 3 et 4 associés.As is clear from the figure 2 , the rotational movement F 4 of the member 7 around the axis X 1 is transmitted to the finger 81 at an interface I 1 through which passes a motor force F 5 of the member 7 to the finger 81 This force is exerted by a first edge 721 of the notch 72 against which is supported a flat lateral face 811 of the finger 81. The interface I 1 is formed by the portions bearing the edge 721 and the face 811. It constitutes a "motor" interface for driving the pawl 8 and elements 2, 3 and 4 associated.

L'épaisseur du bord 721 et de la face 811 perpendiculairement au plan de la figure 2 est limitée par la largeur disponible pour la mise en place des éléments 7 et 2 dans la division du métier, cette division étant généralement comprise entre 10 et 20 mm. Il n'est donc pas possible d'agir sur cette largeur pour augmenter l'aire de contact entre le bord 721 et la face 811. Toutefois, cette aire peut être relativement faible dans la mesure où l'effort F5 est un effort variable qui s'exerce alors que le bord 721 demeure fixe par rapport à la face 811, lorsque l'organe 7 entraîne le cliquet 8.The thickness of the edge 721 and the face 811 perpendicular to the plane of the figure 2 is limited by the width available for the placement of elements 7 and 2 in the division of the trade, this division being generally between 10 and 20 mm. It is therefore not possible to act on this width to increase the contact area between the edge 721 and the face 811. However, this area can be relatively small since the effort F 5 is a variable effort which is exercised while the edge 721 remains fixed relative to the face 811, when the member 7 drives the pawl 8.

Le doigt 81 porte également, par une face latérale plane 812 opposée à la face 811, contre un second bord 722 de l'encoche 72, ceci au niveau d'une interface I2 au niveau de laquelle est transmis un effort de freinage F6 lorsque l'organe 7 décélère, ce qui se produit lorsque l'arbre 1 arrive au voisinage d'une de ses deux positions d'arrêt diamétralement opposées. L'interface I2 constitue donc une interface de freinage entre le cliquet 8 et l'organe 7.The finger 81 also carries, by a flat lateral face 812 opposite the face 811, against a second edge 722 of the notch 72, this at an interface I 2 at which a braking force F 6 is transmitted. when the member 7 decelerates, which occurs when the shaft 1 arrives in the vicinity of one of its two diametrically opposite stop positions. The interface I 2 thus constitutes a braking interface between the pawl 8 and the member 7.

Sur les figures, les faces 811 et 812 et les bords 721 et 722 sont représentés comme n'étant pas en appui, ce qui est le cas dans certaines phases de mouvement du fait d'éventuels jeux fonctionnels. Lorsque l'effort moteur F5 ou l'effort de freinage F6 est transmis, ces jeux sont rattrapés. Les interfaces I1 et I2 s'étendent sur la hauteur des parties planes des faces 811 et 812 et des bords 721 et 722 qui sont susceptibles de venir en appui surfacique les uns contre les autres.In the figures, the faces 811 and 812 and the edges 721 and 722 are shown as not being supported, which is the case in certain phases of movement due to possible functional gaps. When the driving force F 5 or the braking force F 6 is transmitted, these games are caught. The interfaces I 1 and I 2 extend over the height of the plane portions of the faces 811 and 812 and the edges 721 and 722 which are capable of coming into surface abutment against each other.

On note B1 la bissectrice des faces 811 et 812. On note B2 la bissectrice des parties planes des bords 721 et 722. Dans l'exemple des figures 1 à 4, lorsque le doigt 81 est engagé et centré dans une encoche 72, ces bissectrices sont confondues entre elles et avec un rayon R1 radial par rapport à l'axe X1 et passant à égale distance des faces 811 et 812.B 1 is the bisector of faces 811 and 812. B 2 is the bisector of the plane portions of edges 721 and 722. In the example of FIGS. Figures 1 to 4 when the finger 81 is engaged and centered in a notch 72, these bisectors are merged with each other and with a radius R 1 radial to the axis X 1 and passing equidistant from the faces 811 and 812.

Lorsque l'effort F6 est appliqué, c'est-à-dire alors que les éléments 1 et 7 sont en cours de décélération, le doigt 81 commence à être retiré de l'encoche 72, dans le sens de la flèche F7 à la figure 2, ce qui induit un glissement sous charge de la face 812 contre le bord 722, dans le sens de la flèche F8 à la figure 2.When the force F 6 is applied, that is to say while the elements 1 and 7 are being decelerated, the finger 81 begins to be removed from the notch 72, in the direction of the arrow F 7 to the figure 2 , which induces a sliding under load of the face 812 against the edge 722, in the direction of the arrow F 8 to the figure 2 .

Pour éviter que ce glissement sous charge provoque une usure prématurée du doigt 81 ou du bord 722, lorsque le doigt 81 est engagé dans une encoche 72, la hauteur H2 de la projection orthogonale I'2 de l'interface I2 sur la bissectrice B1 est augmentée par rapport aux dispositifs de l'art antérieur.To prevent this sliding under load causes premature wear of the finger 81 or the edge 722, when the finger 81 is engaged in a notch 72, the height H 2 of the orthogonal projection I ' 2 of the interface I 2 on the bisector B 1 is increased compared to devices of the prior art.

Toutefois, la hauteur H1 de la projection orthogonale I'1 de l'interface I1 sur la bissectrice B1, n'est pas augmentée afin de ne pas gêner le mouvement de dégagement F7 du doigt 81 lorsqu'il convient de l'extraire de l'encoche 72 sous l'effet de l'effort F2. En effet, la performance de la commande d'extraction reste identique lorsque la course et la vitesse d'extraction demeurent inchangées. En n'augmentant pas la hauteur H1, on ne diminue donc pas la performance de la commande d'extraction.However, the height H 1 of the orthogonal projection I ' 1 of the interface I 1 on the bisector B 1 , is not increased so as not to hinder the disengagement movement F 7 of the finger 81 when it is appropriate to to extract from the notch 72 under the effect of the force F 2 . Indeed, the performance of the extraction control remains the same when the race and the extraction rate remain unchanged. By not increasing the height H 1 , the performance of the extraction control is not reduced.

La différence des hauteurs H1 et H2 demeure, que l'on définisse ces hauteurs par la projection des interfaces I1 et I2 sur la bissectrice B1 ou sur la bissectrice B2. Au demeurant, dans le cas d'espèce, ces bissectrices sont confondues lorsque le doigt 81 est engagé et centré dans une encoche 72.The difference between the heights H 1 and H 2 remains, that these heights are defined by the projection of the interfaces I 1 and I 2 on the bisector B 1 or on the bisector B 2 . Moreover, in the case in point, these bisectors are confused when the finger 81 is engaged and centered in a notch 72.

Ainsi, la hauteur H2 est supérieure à la hauteur H1. En tenant compte du fait que l'épaisseur des pièces 7 et 8 est uniforme, ceci induit que l'interface I2 a une aire supérieure à l'interface I1, alors ce qui permet une transmission optimisée des efforts à la fois lors de l'entraînement du cliquet 8 par l'organe 7 et lors du dégagement ou de l'extraction du doigt 81 par rapport à l'encoche 72.Thus, the height H 2 is greater than the height H 1 . Taking into account the fact that the thickness of the parts 7 and 8 is uniform, this induces that the interface I 2 has an area greater than the interface I 1 , which allows optimized transmission of the forces at the time when the driving of the pawl 8 by the member 7 and during the release or extraction of the finger 81 relative to the notch 72.

Les bords 721 et 722 de l'encoche 72 sont globalement parallèles entre eux et à la bissectrice B2. De la même façon, les faces latérales 811 et 812 du doigt 81 sont parallèles entre elles et à la bissectrice B1.The edges 721 and 722 of the notch 72 are generally parallel to each other and to the bisector B 2 . In the same way, the lateral faces 811 and 812 of the finger 81 are parallel to each other and to the bisector B 1 .

La face d'extrémité 813 du doigt 81 est globalement perpendiculaire aux faces 811 et 812. Par ailleurs, le fond 723 de chaque encoche 72 présente un relief en forme de bosse arrondie 724, ménagée dans sa partie centrale et contre laquelle vient en appui la face 813.The end face 813 of the finger 81 is generally perpendicular to the faces 811 and 812. Furthermore, the bottom 723 of each notch 72 has a relief in the form of a rounded boss 724, formed in its central part and against which the face 813.

Lorsque, du fait d'une action antérieure sur la queue 82, le doigt 81 se trouve à l'extérieur d'une encoche 72 lorsque l'organe 7 parvient à proximité d'une de ses postions d'arrêt, la ratière est dans la configuration de la figure 3. La face 813 est configurée pour glisser alors sur la surface radiale externe 73 de l'organe 7 dans le sens de la flèche F9, avant que le doigt 81 ne soit engagé dans l'encoche 72 sous l'effet de l'effort élastique du ressort 10, ceci dès que l'encoche 72 parvient en regard de ce doigt 81. Pour ce faire, la face 813 est sensiblement complémentaire de la surface 73 dans sa partie voisine du bord 722 de chaque encoche. En variante, seule une partie de la face 813 peut être sensiblement complémentaire de la surface 73.When, due to an earlier action on the tail 82, the finger 81 is outside a notch 72 when the member 7 reaches close to one of its stop positions, the dobby is in the configuration of the figure 3 . The face 813 is configured to slide then on the outer radial surface 73 of the member 7 in the direction of the arrow F 9 , before the finger 81 is engaged in the notch 72 under the effect of the elastic force of spring 10, this as soon as the notch 72 reaches opposite this finger 81. To do this, the face 813 is substantially complementary to the surface 73 in its adjacent portion of the edge 722 of each notch. Alternatively, only part of the face 813 may be substantially complementary to the surface 73.

Comme il ressort plus particulièrement de cette figure 3, la différence des hauteurs radiales H2 et H1 est liée au fait que la projection orthogonale du bord 722 sur la bissectrice B2 présente une hauteur h2 supérieure à la hauteur h1 de la projection orthogonale du bord 721 sur cette bissectrice B2. Au contraire, les projections orthogonales des faces 811 et 812 sur la bissectrice B1 ont des hauteurs h'1 et h'2 sensiblement égales.As is clear from this figure 3 , the difference in the radial heights H 2 and H 1 is related to the fact that the orthogonal projection of the edge 722 on the bisector B 2 has a height h 2 greater than the height h 1 of the orthogonal projection of the edge 721 on this bisector B 2 . On the contrary, the orthogonal projections of the faces 811 and 812 on the bisector B 1 have heights h ' 1 and h' 2 substantially equal.

Il est ainsi possible d'utiliser un même cliquet 8, dans la même position et avec la même géométrie, quel que soit le sens de rotation F4 de l'arbre 1 autour de l'axe X1, l'organe 7 étant simplement retourné, comme représenté à la figure 4, pour que le bord le plus haut 722 de ses encoches 72 soit disposé, par rapport au doigt 81 du cliquet 8, de façon à constituer l'interface de freinage I2. Ceci implique toutefois que les interfaces I1 et I2 soient symétriques par rapport au rayon R1.It is thus possible to use the same pawl 8, in the same position and with the same geometry, whatever the direction of rotation F 4 of the shaft 1 about the axis X 1 , the member 7 being simply returned, as shown in figure 4 , so that the highest edge 722 of its notches 72 is disposed relative to the finger 81 of the pawl 8, so as to constitute the braking interface I 2 . This implies, however, that the interfaces I 1 and I 2 are symmetrical with respect to the radius R 1 .

Dans le second mode de réalisation de l'invention représenté à la figure 5, les éléments analogues à ceux représentés pour le premier mode de réalisation portent des références identiques. Sur cette figure, une ratière R est représentée de façon partielle. Cette ratière comprend des éléments analogues aux éléments 2, 4, 5 et 11 à 14 du premier mode de réalisation qui ne sont pas représentés.In the second embodiment of the invention shown in figure 5 , elements similar to those shown for the first embodiment bear identical references. In this figure, a dobby R is partially represented. This dobby comprises elements similar to elements 2, 4, 5 and 11 to 14 of the first embodiment which are not shown.

L'arbre d'entraînement 1 de cette ratière est solidaire en rotation d'un disque d'entraînement 7 ayant sensiblement la même fonction que l'organe 7 du premier mode de réalisation mais qui est de forme globalement circulaire centrée sur l'axe X1 de rotation de l'arbre 1. Le disque 7 est pourvu de quatre dents 71 de solidarisation en rotation avec l'arbre 1 et de deux encoches 72 diamétralement opposées selon un rayon D1 perpendiculaire à l'axe X1 de rotation de l'arbre 1. Un cliquet 8 est monté pivotant sur un axe 9 porté par un plateau 3, ce cliquet 8 étant soumis à l'action d'un ressort 10 tendant à engager un doigt 81 de ce cliquet dans l'une des encoches 72. L'arbre 1 tourne dans le sens horaire à la figure 5, comme représenté par la flèche F4, c'est-à-dire dans un sens opposé au sens de rotation de l'arbre 1 aux figures 1 à 3.The drive shaft 1 of this dobby is integral in rotation with a drive disk 7 having substantially the same function as the member 7 of the first embodiment but which is generally shaped circular disc centered on the axis X 1 of rotation of the shaft 1. The disc 7 is provided with four teeth 71 for securing in rotation with the shaft 1 and two notches 72 diametrically opposed along a radius D 1 perpendicular to the X axis 1 of rotation of the shaft 1. A pawl 8 is pivotally mounted on an axis 9 carried by a plate 3, this pawl 8 being subjected to the action of a spring 10 tending to engage a finger 81 of the ratchet in one of the notches 72. The shaft 1 rotates clockwise at the figure 5 , as represented by the arrow F 4 , that is to say in a direction opposite to the direction of rotation of the shaft 1 to Figures 1 to 3 .

On note respectivement I1 l'interface de transmission de l'effort moteur F5 entre le disque 7 et le doigt 81, cette interface étant définie entre une première surface latérale plane 811 du doigt 81 et un premier bord 721 de l'encoche 72. On note I2 l'interface de freinage entre une deuxième face latérale plane 812 du doigt 81 et un deuxième bord 722 de l'encoche 72, l'effort de freinage F6 du doigt 81 étant exercé au niveau de cette interface à la fin d'un mouvement de rotation sur 180° de l'arbre 1.The transmission interface of the motor force F 5 between the disk 7 and the finger 81 is respectively denoted I 1 , this interface being defined between a first flat lateral surface 811 of the finger 81 and a first edge 721 of the notch 72. I 2 note the braking interface between a second flat lateral face 812 of the finger 81 and a second edge 722 of the notch 72, the braking force F 6 of the finger 81 being exerted at this interface to the end of 180 ° rotation of the shaft 1.

Comme précédemment, la projection orthogonale I'2 de l'interface I2 sur les bissectrices B1 et B2, définies comme précédemment, a une hauteur H2 supérieure à la hauteur H1 de la projection orthogonale I'1 de l'interface I1 sur ces bissectrices.As previously, the orthogonal projection I ' 2 of the interface I 2 on the bisectors B 1 and B 2 , defined as above, has a height H 2 greater than the height H 1 of the orthogonal projection I' 1 of the interface I 1 on these bisectors.

Dans ce cas, les projections orthogonales sur la bissectrice B2 des bords 721 et 722 ont sensiblement la même hauteur radiale, h1 et h2, alors que la hauteur h'2 de la projection orthogonale de la face 812 sur la bissectrice B1 est supérieure à la hauteur h'1 de la projection orthogonale de la face 811 sur cette bissectrice B1.In this case, the orthogonal projections on the bisector B 2 of the edges 721 and 722 have substantially the same radial height, h 1 and h 2 , whereas the height h 2 of the orthogonal projection of the face 812 on the bisector B 1 is greater than the height h ' 1 of the orthogonal projection of the face 811 on this bisector B 1 .

En pratique, les valeurs de H2, h1, h2 et h'2 sont sensiblement égales alors que les valeurs de H1 et h'1 sont égales et inférieures aux précédentes.In practice, the values of H 2 , h 1 , h 2 and h ' 2 are substantially equal while the values of H 1 and h' 1 are equal to and lower than the previous ones.

Le fond 723 de l'encoche 72 est globalement perpendiculaire aux bords 721 et 722, alors que la face d'extrémité 813 du doigt 81 est inclinée par rapport à un rayon R1 médian entre les faces 811 et 812 qui sont parallèles entre elles et à ce rayon, de même que les bords 721 et 722.The bottom 723 of the notch 72 is generally perpendicular to the edges 721 and 722, while the end face 813 of the finger 81 is inclined relative to a median radius R 1 between the faces 811 and 812 which are parallel to each other and at this radius, as well as the edges 721 and 722.

Ce mode de réalisation présente l'avantage qu'un même disque d'entraînement peut être utilisé quel que soit le sens de rotation F4 de l'arbre 1. Seul le cliquet 8 doit être adapté par une répartition correspondante de sa première face latérale 811 et de sa deuxième face latérale 812 qui définissent respectivement les interfaces I1 et I2.This embodiment has the advantage that a same drive disk can be used regardless of the direction of rotation F 4 of the shaft 1. Only the pawl 8 must be adapted by a corresponding distribution of its first side face 811 and its second side face 812 which respectively define the interfaces I 1 and I 2 .

Dans le troisième mode de réalisation de l'invention représenté à la figure 7, les projections orthogonales I'1 et I'2, sur les bissectrices B1 et B2 définies comme précédemment, des interfaces I1 et I2, définies comme précédemment, ont des hauteurs différentes, la hauteur H2 de la projection I'2 étant supérieure à la hauteur H1 de la projection I'1. Ce mode de réalisation diffère du précédent en ce que la face d'extrémité 813 du doigt 81 est de forme sensiblement complémentaire du fond 723 de l'encoche 72.In the third embodiment of the invention shown in figure 7 , the orthogonal projections I ' 1 and I' 2 , on the bisectors B 1 and B 2 defined as above, interfaces I 1 and I 2 , defined as above, have different heights, the height H 2 of the projection I ' 2 being greater than the height H 1 of the projection I ' 1 . This embodiment differs from the previous embodiment in that the end face 813 of the finger 81 is substantially complementary in shape to the bottom 723 of the notch 72.

En prenant les mêmes définitions que précédemment, les hauteurs H2, h2 et h'2 sont égales entre elles, alors que les hauteurs H1, h1 et h'1 sont égales entre elles et inférieures aux précédentes.Taking the same definitions as above, the heights H 2 , h 2 and h ' 2 are equal to each other, while the heights H 1 , h 1 and h' 1 are equal to each other and lower than the previous ones.

Comme précédemment, les faces latérales 811 et 812 du doigt 81 sont parallèles entre elles et à la bissectrice B1, alors que les bords 721 et 722 de l'encoche 72 sont parallèles entre eux et à la bissectrice B2.As previously, the side faces 811 and 812 of the finger 81 are parallel to each other and to the bisector B 1 , while the edges 721 and 722 of the notch 72 are parallel to each other and to the bisector B 2 .

Les caractéristiques techniques des différents modes de réalisation représentées peuvent être combinées entre elles. En particulier, l'organe 7 du premier mode de réalisation peut être en forme de disque et le disque 7 du deuxième mode de réalisation peut être de forme oblongue. De même, un relief du type de la bosse 724 peut être prévu dans tous les modes de réalisation pour recevoir en appui le doigt 81.The technical characteristics of the various embodiments shown can be combined with each other. In particular, the member 7 of the first embodiment may be disk-shaped and the disk 7 of the second embodiment may be oblong. Similarly, a relief of the type of the bump 724 can be provided in all embodiments to receive in support the finger 81.

Dans les trois modes de réalisation représentés, les bissectrices B1 et B2 sont confondues lorsque le doigt 81 est engagé dans une encoche 72. Toutefois, ceci n'est pas obligatoire. En outre, il n'est pas obligatoire que les bissectrices B1 et B2 soient confondues avec un rayon radial à l'axe X1.In the three embodiments shown, the bisectors B 1 and B 2 are combined when the finger 81 is engaged in a notch 72. However, this is not mandatory. In addition, it is not mandatory for the bisectors B 1 and B 2 to be confused with a radial radius at the axis X 1 .

L'invention a été représentée avec un doigt 81 dont les faces latérales 811 et 812 sont planes et des encoches 72 dont les bords 721 et 722 sont rectilignes. Ces faces et/ou ces bords peuvent être bombés, étant entendu que les interfaces de contact ne sont alors pas rigoureusement linéiques mais surfaciques compte tenu des pressions de surface. Les bissectrices et les projections orthogonales de ces interfaces sont alors définies de façon analogue à celles mentionnées ci-dessus. En particulier, si les bords ou faces latérales considérées pour définir ces bissectrices ne sont pas rectilignes, on définit une droite moyenne, par exemple une corde d'un arc de cercle ou une tangente dans une zone centrale de ces bords ou faces, comme représentative de l'orientation de ces bords ou faces. A partir de telles droites moyennes, on définit une bissectrice comme précédemment.The invention has been shown with a finger 81 whose side faces 811 and 812 are flat and notches 72 whose edges 721 and 722 are straight. These faces and / or these edges may be curved, it being understood that the contact interfaces are then not strictly linear but surface based on surface pressures. The bisectors and the orthogonal projections of these interfaces are then defined in a manner analogous to those mentioned above. In particular, if the edges or lateral faces considered for defining these bisectors are not rectilinear, an average line is defined, for example a cord of an arc of a circle or a tangent in a central zone of these edges or faces, as representative of the orientation of these edges or faces. From such average lines, a bisector is defined as before.

Claims (10)

  1. Rotary dobby for a weaving loom, comprising for each of the plates thereof:
    - an oscillating component (4) which is connected to a heald frame (6) and which is associated with an actuation element (2) which is mounted loosely on a main shaft (1) of the dobby (R);
    - a movable coupling member (8) which is carried by a plate (3) which is fixedly joined to the actuation element, this movable member being subject to first resilient means (10) in order to operate the angular connection of the plate with a driving element (7) which is fixedly joined in terms of rotation to the main shaft and which is provided with two diametrically opposed recesses (72) for receiving a finger (81) of the coupling member, the finger being able to move into contact with the edges (721, 722) of a recess, in which it is engaged in the region of a first interface (I1) defined between a first lateral face (811) of the finger and a first edge (721) of the recess and via which there is transmitted to the movable member a drive force (F5) for rotating the plate, and a second interface (I2) defined between a second lateral face (812) of the finger and a second edge (722) of the recess and via which there is transmitted to the movable member a force (F6) for braking the plate,
    characterised in that the height (H2) of the orthogonal projection (I'2) of the second interface (I2) on the bisector (B1) of the lateral faces (811, 812) of the finger (81) or on the bisector (B2) of the edges (721, 722) of the recess (72) is greater than the height (H1) of the orthogonal projection (I'1) of the first interface (I1) on the same bisector (B1 or B2) .
  2. Dobby according to claim 1, characterised in that the height (h2) of the orthogonal projection of the second edge (722) on the bisector (B2) of the edges (721, 722) of each recess (72) is greater than the radial height (h1) of the orthogonal projection of the first edge (721) of the recess on the same bisector (B2) , the orthogonal projections of the lateral faces (811, 812) of the finger (81) on the bisector (B1) of these faces having substantially the same height (h'1, h'2).
  3. Dobby according to claim 2, characterised in that the end face (813) of the finger (81) of the movable member (8) at least partially substantially complements a portion (73) of the outer radial surface of the drive element (7) in the region of the second edge (722) of each of the recesses (72) thereof.
  4. Dobby according to claim 1, characterised in that the height (h'2) of the orthogonal projection of the second lateral face (812) of the finger (81) on the bisector (B1) of the lateral faces (811, 812) of this finger is greater than the height (h'1) of the orthogonal projection of the first lateral face (811) of the finger on the same bisector (B1), the orthogonal projections of the edges (721, 722) of the recesses on the bisector (B2) of these edges having substantially the same height (h1, h2).
  5. Dobby according to claim 1, characterised in that the height (h2) of the orthogonal projection of the second edge (722) on the bisector (B2) of the edges (721, 722) of each recess (72) is greater than the height (h1) of the orthogonal projection of the first edge (721) of the recess on the same bisector (B2) , whilst the height (h'2) of the orthogonal projection of the second lateral face (812) of the finger (81) on the bisector (B1) of the lateral faces (811, 812) of this finger is greater than the height (h'1) of the orthogonal projection of the first lateral face (811) thereof on the bisector (B1) of these faces.
  6. Dobby according to claim 5, characterised in that the end face (813) of the finger (81) substantially complements the base (723) of the recess (72).
  7. Dobby according to any one of the preceding claims,
    characterised in that the bisector (B1) of the first and second lateral faces (811, 812) of the finger (81) and/or the bisector (B2) of the first and second edges (721, 722) of each recess (72) become(s) merged with a radius (R1) which is radial relative to the geometric rotation axis (X1) of the drive shaft (1).
  8. Dobby according to any one of the preceding claims,
    characterised in that the first and second lateral faces (811, 812) of the finger (81) and the first and second edges (721, 722) of each recess (72) are substantially parallel with a radius (R1) which is radial relative to the geometric rotation axis (X1) of the drive shaft (1) and which becomes merged with the bisectors (B1, B2) of these faces (811, 812) and edges (721, 722).
  9. Weaving loom (M) which is provided with a dobby (R) according to any one of the preceding claims.
  10. Drive element (7) which belongs to a dobby according to any one of claims 1 to 3 and 5 to 8 and which is intended to rotate a plate (3) which is fixedly joined to an actuation element (2) which is associated with an oscillating component (4) of the dobby, the drive element being provided with two recesses (72) which are intended to selectively receive a finger (81) which belongs to a movable coupling member (8) which is carried by the plate (3), characterised in that the height (h2) of the orthogonal projection of an edge (722) of each recess which is intended to transmit to the finger (81) a force (F6) for braking the plate on the bisector (B2) of the edges (721, 722) of this recess (72) is greater than the height (h1) of the orthogonal projection, on the same bisector (B2), of an edge (721) of this recess which is intended to transmit to the finger (81) a drive force (F5) for rotating the plate.
EP07356036A 2006-03-31 2007-03-26 Rotary dobby, weaving loom equipped with such a dobby and driving element for such a dobby Active EP1840251B1 (en)

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FR0602830A FR2899244B1 (en) 2006-03-31 2006-03-31 ROTARY RATIERE, WEAVING EQUIPPED WITH SUCH REAL ESTATE AND TRAINING ELEMENT FOR SUCH REAL ESTATE

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EP (1) EP1840251B1 (en)
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AT (1) ATE440161T1 (en)
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CN101709525B (en) * 2009-11-19 2011-04-13 常熟纺织机械厂有限公司 Three-shed shedding mechanism for rotary electronic dobby
FR2957366B1 (en) * 2010-03-12 2012-04-13 Staubli Sa Ets ROTARY RATIERE AND WEAVING EQUIPPED WITH SUCH A RETIRE

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EP0768402A1 (en) * 1995-10-06 1997-04-16 FIMTEXTILE S.p.A. Device for programming rotary dobbies in weaving machines

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EP0080547A1 (en) * 1981-11-30 1983-06-08 GebràœDer Sulzer Aktiengesellschaft Operation process for a coupling device to control the heald frames of a loom, and relevant coupling device
DE3278209D1 (en) * 1982-12-03 1988-04-14 Sulzer Ag Loom dobby
FR2540524B1 (en) * 1983-02-07 1985-07-26 Staubli Sa Ets SYNCHRONIZED ROTARY RATIERE FOR WEAVING
FR2757882B1 (en) * 1996-12-31 1999-02-19 Staubli Sa Ets ROTARY RATIERE AND WEAVING MACHINE EQUIPPED WITH SUCH A RATIERE

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Publication number Priority date Publication date Assignee Title
EP0768402A1 (en) * 1995-10-06 1997-04-16 FIMTEXTILE S.p.A. Device for programming rotary dobbies in weaving machines

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EP1840251A1 (en) 2007-10-03
FR2899244B1 (en) 2008-06-13
FR2899244A1 (en) 2007-10-05
CN101046022A (en) 2007-10-03
DE602007001990D1 (en) 2009-10-01
ATE440161T1 (en) 2009-09-15
CN101046022B (en) 2012-02-01

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