EP3162932B1 - Shedding mechanism comprising a level adjustment device and weaving machine including said mechanism - Google Patents

Description

The present invention relates to a weave mechanism for a loom having a leveling device. Finally, the invention relates to a loom comprising such armor mechanics.

In the field of looms, it is known to equip a loom with armor mechanics so that frames of the trade are moved by oscillating levers armor mechanics. These levers are mounted on a shaft and are provided with follower rollers against cams of the armor mechanics. During weaving, the frames of the loom and the levers of the armor mechanics are in a so-called weaving configuration. On the contrary, during certain operations of maintenance or adjustment of the loom, for example at the occasion of a fault of the loom or a breakage of a warp, it is necessary to bring all the executives of the profession, and thus the levers of mechanics, in a common so-called leveling configuration.

In this regard, it is known, for example FR-A-2,868,090 to equip the armor mechanics with a leveling device configured to mechanically disengage the follower rollers with the cams. The leveling device is a crank-handle system: an electric motor is configured to actuate a threaded rod on which is mounted a nut integral with an operating arm. The operating arm makes it possible to exert a rotation torque on an eccentric linked to the shaft of the oscillating levers. Thus, the eccentric can swing the lever shaft between the weave pattern and the leveling pattern. However, according to this approach, the motor oscillates within the frame between the weave configuration and the leveling configuration. In addition, this approach induces sealing problems of the electric motor and some difficulties for the arrangement of the leveling device in the loom.

In this respect, it is also known, for example EP-A-0 580 528 , to use a leveling device equipped with an eccentric integral with the shaft of the levers and articulated between a movable rod of a jack and an arched link. The cylinder and the arched link are articulated on a frame of armor mechanics. The jack is configured to rotate the eccentric and move the lever shaft between the weave pattern and the leveling pattern. However, such a leveling device requires a powerful actuator. The cylinder is highly stressed and must exert a major effort to to move the lever shaft. In addition, the operation of such a leveling device is accompanied by a jerk of the actuator, which is detrimental to the life of the armor mechanics. Finally, such a leveling device also suffers from problems concerning the dimensioning of the parts, their resistance to forces and lubrication.

It is these drawbacks that the invention intends to remedy more particularly by proposing a new leveling device that makes it possible to use a low-power motor.

In this spirit, the invention relates to a weave mechanism for a loom equipped with a leveling device of a plurality of oscillating levers, the oscillating levers being provided with follower rollers and mounted on a shaft of the levers, lever shaft being movable between a weaving pattern, wherein the follower rollers of the swing levers are in abutment against cams of the armor mechanics, and a leveling configuration, wherein the follower rollers of the swing levers are spaced from the cams of the armor mechanics. The leveling device comprises an eccentric leveling member integral with the lever shaft. According to the invention, the armor mechanics further comprises a slider movable in translation along a fixed axis between a first position corresponding to the weaving configuration of the lever shaft and a second position corresponding to the leveling configuration of the lever shaft, and at least one leveling rod having a first end pivotally mounted on the eccentric leveling member about an axis of the connecting rod parallel to the central axis of the lever shaft and a second end pivotally mounted on the pad about an axis of articulation of the pad parallel to the axis of the lever shaft.

Thanks to the invention, the leveling device allows the use of a fixed electric motor and positioned outside the frame. In addition, the forces of transmission of the engine torque to the leveling lever are reduced by the use of a rod and higher than those of the previous solutions, which allows the use of a low power electric motor so that the The power required for leveling is halved compared to current solutions. The leveling rod has a large lever arm which drives the lever shaft, while the pad makes it possible to make up the efforts of the leveling device in order to preserve the motor axis. The size of this leveling device is moderate. In addition, it is easily accessible for a maintenance operator.

• L'axe de translation du patin est perpendiculaire à l'axe d'articulation de la bielle de nivelage sur le patin.
• En configuration de tissage :
  • une projection orthogonale, dans un plan de projection perpendiculaire à l'axe central de l'arbre des leviers, d'un axe longitudinal de la bielle de nivelage qui relie perpendiculairement l'axe de la bielle de nivelage et l'axe d'articulation du patin
  • une projection orthogonale, dans le même plan de projection, d'un axe qui relie perpendiculairement l'axe de la bielle de nivelage et l'axe central de l'arbre des leviers
  définissent un premier angle dont la valeur est comprise entre 80° et 100°, de préférence égale à 90° à 2° près.
• En configuration de tissage :
  • une projection orthogonale, dans un plan de projection perpendiculaire à l'axe de l'arbre des leviers, de l'axe de translation du patin et
  • une projection orthogonale, dans le même plan de projection, d'un axe longitudinal de la bielle de nivelage qui relie perpendiculairement l'axe de la bielle de nivelage et l'axe d'articulation du patin et
  définissent, dans le plan de déplacement, un angle de l'organe excentrique dont la valeur est comprise entre 90° et 110°, de préférence égale à 95° à 2° près, ce second angle étant défini du côté de la course du patin lorsqu'il est dans la configuration de tissage.
• L'arbre des leviers est :
  • guidé en translation à chacune de ses extrémités par une rainure de guidage définie dans une platine, et
  • mobile en translation le long d'un axe de chaque rainure de guidage, entre la configuration de tissage et la configuration de nivelage.
• La mécanique d'armure comprend, en outre :
  • un bras latéral solidaire de l'arbre des leviers et mobile en rotation autour de l'axe central de l'arbre des leviers entre une première position angulaire correspondant à la configuration de tissage de l'arbre des leviers et une deuxième position angulaire correspondant à la configuration de nivelage de l'arbre des leviers, et
  • au moins une biellette montée pivotante sur l'organe excentrique de nivelage au niveau d'une extrémité du bras autour d'un axe du bras et montée pivotante sur un bâti de la mécanique d'armure autour d'un axe du bâti et mobile entre une troisième position correspondant à la configuration de tissage de l'arbre des leviers et une quatrième position correspondant à la configuration de nivelage de l'arbre des leviers.
• Lorsque la biellette est dans la troisième position, l'entraxe entre l'axe du bras et l'axe du bâti est égal à une première valeur et lorsque la biellette est dans la quatrième position, cet entraxe est égal à une seconde valeur, la première valeur étant supérieure à la seconde valeur.
• L'organe excentrique de nivelage est solidaire d'un organe de liaison mobile en rotation autour d'un axe fixe, l'axe central de l'arbre des leviers est parallèle et non coïncidant avec l'axe de rotation de l'organe excentrique de nivelage, et l'arbre des leviers est mobile en rotation autour de l'axe de rotation de l'organe excentrique de nivelage entre la configuration de tissage et la configuration de nivelage.
• L'organe excentrique de nivelage est comprend un bras mobile en rotation autour de l'axe fixe, le bras s'étendant parallèlement à l'axe central de l'arbre des leviers et solidarisant en rotation l'arbre des leviers à l'organe excentrique de nivelage de façon excentrique par rapport à l'axe fixe.
• L'organe excentrique de nivelage est un levier de nivelage qui comporte au moins un bras monté pivotant sur l'axe de la bielle de nivelage et une portion centrale solidaire en rotation de l'arbre des leviers.
• Le patin est un écrou taraudé qui est monté sur une tige filetée mobile en rotation autour de l'axe du patin.
• La tige filetée est entraînée en rotation autour de l'axe du patin par un moteur électrique fixé sur un bâti de la mécanique d'armure.
• Le patin est immergé dans un bain d'huile de lubrification d'un bâti de la mécanique d'armure.

According to advantageous but non-obligatory aspects of the invention, such armor mechanics may include one or more of the following features, taken in any technically permissible combination:

• The axis of translation of the pad is perpendicular to the axis of articulation of the leveling rod on the pad.
• In weaving configuration:
  • an orthogonal projection, in a plane of projection perpendicular to the central axis of the lever shaft, of a longitudinal axis of the leveling rod which perpendicularly connects the axis of the leveling rod and the axis of articulation skating
  • an orthogonal projection, in the same plane of projection, of an axis which connects perpendicularly the axis of the leveling rod and the central axis of the lever shaft
  define a first angle whose value is between 80 ° and 100 °, preferably equal to 90 ° to 2 °.
• In weaving configuration:
  • an orthogonal projection, in a plane of projection perpendicular to the axis of the shaft of the levers, of the axis of translation of the pad and
  • an orthogonal projection, in the same plane of projection, of a longitudinal axis of the leveling rod which perpendicularly connects the axis of the leveling rod and the axis of articulation of the skid and
  define, in the plane of displacement, an angle of the eccentric member whose value is between 90 ° and 110 °, preferably equal to 95 ° to 2 °, this second angle being defined on the side of the run of the pad when in the weaving configuration.
• The tree of the levers is:
  • guided in translation at each of its ends by a guide groove defined in a plate, and
  • movable in translation along an axis of each guide groove, between the weave pattern and the leveling pattern.
• The armor mechanics further includes:
  • a lateral arm integral with the lever shaft and movable in rotation about the central axis of the lever shaft between a first angular position corresponding to the weaving configuration of the lever shaft and a second angular position corresponding to the leveling configuration of the levers shaft, and
  • at least one rod pivotally mounted on the eccentric leveling member at one end of the arm about an axis of the arm and pivotally mounted on a frame of the armor mechanics about an axis of the arm constructed and movable between a third position corresponding to the weaving pattern of the lever shaft and a fourth position corresponding to the leveling configuration of the lever shaft.
• When the rod is in the third position, the distance between the axis of the arm and the axis of the frame is equal to a first value and when the link is in the fourth position, this distance is equal to a second value, the first value being greater than the second value.
• The eccentric leveling member is secured to a connecting member movable in rotation about a fixed axis, the central axis of the lever shaft is parallel and not coinciding with the axis of rotation of the eccentric member of leveling, and the shaft of the levers is rotatable about the axis of rotation of the eccentric leveling member between the weave configuration and the leveling configuration.
• The eccentric leveling member comprises an arm movable in rotation about the fixed axis, the arm extending parallel to the central axis of the lever shaft and solidarisant in rotation the shaft of the levers to the organ eccentric leveling eccentrically with respect to the fixed axis.
• The eccentric leveling member is a leveling lever which comprises at least one arm pivotally mounted on the axis of the leveling rod and a central portion integral in rotation with the lever shaft.
• The pad is a threaded nut which is mounted on a threaded rod movable in rotation about the axis of the pad.
• The threaded rod is rotated about the axis of the shoe by an electric motor attached to a frame of the armor mechanics.
• The pad is immersed in a lubricating oil bath of a frame of armor mechanics.

Finally, the invention relates to a loom comprising a weave mechanism as described above.

• la figure 1 est une vue en perspective d'une mécanique d'armure selon un premier mode de réalisation, dont certains composants ont été omis pour la clarté du dessin et lorsque un arbre des leviers est dans une configuration de tissage ;
• la figure 2 est une vue éclatée de la mécanique d'armures à la figure 1, dont certains composants ont été omis et lorsque l'arbre des leviers est dans une configuration de nivelage ;
• la figure 3 est une vue, selon la flèche III à la figure 1, d'un organe articulé de nivelage du dispositif de nivelage ;
• la figure 4 est une coupe, selon le plan IV-IV à la figure 3, de l'organe articulé de nivelage ;
• la figure 5 est une coupe partielle, selon le plan V-V à la figure 4, de l'organe articulé du nivelage ;
• la figure 6 est une vue de côté de la mécanique d'armure à la figure 1 ;
• la figure 7 est une vue en perspective partielle, selon la flèche VII à la figure 1, du dispositif de nivelage ;
• la figure 8 est une vue analogue à la figure 6, lorsque l'arbre des leviers est dans la configuration de nivelage ;
• la figure 9 est une vue analogue à la figure 7, lorsque l'arbre des leviers est dans la configuration de nivelage ;
• la figure 10 est une vue éclatée d'une mécanique d'armure selon un deuxième mode de réalisation et dont certains composants ont été omis;
• la figure 11 est une vue en perspective d'un levier de nivelage et de l'arbre des leviers de la mécanique d'armure de la figure 10 ;
• la figure 12 est une vue de côté de la mécanique d'armure à la figure 10, lorsque l'organe articulé de nivelage est dans la configuration de tissage ;
• la figure 13 est une vue analogue à la figure 12, lorsque l'organe articulé de nivelage est dans la configuration de nivelage ;
• la figure 14 est une vue analogue à la figure 3 d'une variante de l'organe articulé de nivelage ;
• la figure 15 est une coupe, selon le plan XV-XV à la figure 14, de l'organe articulé de nivelage ;
• la figure 16 est une coupe, selon le plan XVI-XVI à la figure 14, de l'organe articulé de nivelage ; et
• les figures 17 et 18 sont des vues en perspective d'organes de nivelage de l'arbre de leviers appartenant à des mécaniques d'armures selon d'autres modes de réalisation.

The invention and other advantages thereof will appear more clearly in the light of the following description of several embodiments of a weave mechanism in accordance with its principle, given solely by way of example and with reference to the drawings in which:

• the figure 1 is a perspective view of a weave mechanism according to a first embodiment, some components of which have been omitted for clarity of the drawing and when a lever shaft is in a weave pattern;
• the figure 2 is an exploded view of the armor mechanics at the figure 1 , some components have been omitted and the lever shaft is in a leveling configuration;
• the figure 3 is a view, according to the arrow III to the figure 1 an articulated leveling member of the leveling device;
• the figure 4 is a section, according to plane IV-IV at the figure 3 of the articulated leveling member;
• the figure 5 is a partial section, according to plan VV at figure 4 , the articulated body of the leveling;
• the figure 6 is a side view of the armor mechanics at the figure 1 ;
• the figure 7 is a partial perspective view, according to arrow VII at figure 1 , of the leveling device;
• the figure 8 is a view similar to the figure 6 when the lever shaft is in the leveling configuration;
• the figure 9 is a view similar to the figure 7 when the lever shaft is in the leveling configuration;
• the figure 10 is an exploded view of a weave mechanism according to a second embodiment and some components of which have been omitted;
• the figure 11 is a perspective view of a leveling lever and lever shaft of the armor mechanics of the figure 10 ;
• the figure 12 is a side view of the armor mechanics at the figure 10 when the articulated leveling member is in the weave pattern;
• the figure 13 is a view similar to the figure 12 when the articulated leveling member is in the leveling configuration;
• the figure 14 is a view similar to the figure 3 a variant of the articulated leveling member;
• the figure 15 is a cup, according to plan XV-XV at the figure 14 of the articulated leveling member;
• the figure 16 is a cup, according to plan XVI-XVI at the figure 14 of the articulated leveling member; and
• the Figures 17 and 18 are perspective views of leveling members of the lever shaft belonging to armor mechanics according to other embodiments.

A loom, not shown in the figures, includes a plurality of loom frames. The different frames of the trade are animated by an oscillating movement vertical, printed using a 1 armor mechanic. The loom thus comprises two phases of operation: a first phase, called weaving, and a second phase, called leveling.

In the weaving phase, weave mechanics 1 prints the swing motion to the frames. The craft is thus weaving. In the leveling phase, the craft stops weaving and the frames are all arranged in a neutral position where a sheet of warp threads is in a single plane.

The armature mechanics 1, of the mechanical cam type, comprises a frame 2, a set 4 of cams, a system 6 of levers, a leveling device 8, a motor 10 and two plates 12.

The frame 2 is configured to contain the components of the armor mechanics 1 and defines a support plane P0 in which the components are arranged. The frame 2 comprises a base 14 and a cover 16. A quantity of lubricating oil is received in the base 14, so that the components of the armor mechanics 1 are immersed in a bath of lubricating oil. .

The cover 16 of the frame 2 is configured to close the armor mechanics 1 and thus exerts a protective function for the components of the armor mechanics 1.

The cam assembly 4 comprises a plurality of cams 18, a camshaft 20 and an actuator, which is not shown in the figures. Each cam 18 has an outer race 22 and is mounted on the shaft 20. X20 is a longitudinal axis of the shaft 20. This axis represents the shaft 20 to figures 1 and 2 . The shaft 20 is rotatable about its axis X20 and is driven by the actuator of the cam machine 4. Thus, the cams 18 are also rotatable about the axis X20 of the shaft 20.

The shaft 20 is supported by the plates 12 which are fixed to the frame 2. In particular, each plate 12 comprises a bearing 24 in which the shaft 20 is arranged.

The system of the levers 6 comprises a plurality of oscillating levers 26, a stop 27 and a shaft 28 of the levers.

The levers 26 are provided in number equivalent to the number of loom frames of the loom. For example, the number of levers 26 is equal to eight or ten, preferably equal to ten.

Each lever 26 is coupled to one of the aforementioned frames, using a connecting rod 30 and a crank lever 32 and a set of rods not shown draws. Alternatively, cables connect the levers 26 to the corresponding heddle frame.

Each lever 26 has an elongated portion 34 and a central portion 36. The elongated portion 34 is configured to transmit the vertical oscillation motion to the connecting rod 30 mentioned above. The central portion 36 is equipped with an orifice 38 and two flanges 40. Between each flange 40 and the central portion 36 is mounted as a yoke follower roller 42. Thus, each lever 26 comprises two follower rollers 42 which are fit to come in support against the tracks 22 of the cams 18.

The levers 26 are mounted on the shaft 28 which defines a central axis X28 which is parallel to the axis X20. Thus, the shaft 28 of the levers is movable, around the central axis X28, between a first configuration, called weaving, and a second configuration, called leveling.

The weave configuration of the shaft 28 corresponds to the weaving phase of the loom. In particular in the weaving configuration, the follower rollers 42 of the levers 26 bear against the tracks 22 of the cams 18.

On the contrary, the leveling configuration corresponds to the leveling phase of the loom. In particular, the follower rollers 42 of the levers 26 are spaced from the tracks 22 of the cams 18. It may happen occasionally that one of the two follower rollers 42 of a lever remains in contact with a track 22 in accordance with the provision of the cam 18 relative to its axis X20 which is opposite. The leveling configuration ensures alignment of frames at the same height despite these casual contacts.

The stop 27 of the levers 26 has a semi-cylindrical shape. It is arranged parallel to the X20 and X28 axes. The stop 27 is supported by the plates 12 and is arranged at a certain height relative to the base 14 of the frame 2. The stop 27 is configured to stop the tilting of the levers 26 driven by the weight of the rotating frames to the leveling configuration . The shaft 28 is also supported by the plates 12 fixed to the frame 2. In particular each plate 12 defines a groove 44 for guiding the shaft 28. Each guide groove 44 generally has a shape of C inclined with respect to the plane of P0 support of the frame 2. For example, the grooves 44 are centered on an axis X44 inclined relative to the P0 plane of about 40 °. Each guide groove 44 thus has a bottom 440 adapted to receive bearing shaft 28 in the weave configuration.

Thus, the shaft 28 of the levers 26 is movable, further, in translation along the axis X44 of each groove 44, between the weave configuration and the leveling configuration.

The shaft 28 is cylindrical and circular in a plane P1 perpendicular to the plane P0 of the frame 2. Note d28 the outer diameter of the shaft 28 measured parallel to the plane P1. There are also two surfaces of the shaft 28 defining the ends of the shaft 28.

The shaft 28 of the levers 26 is divided into several portions. There is a first guide portion, a support portion of the levers, a second guide portion, and a hinge portion. The first and second guide portions 46 and 50 are configured to be each arranged in a guide groove 44. The portion 48 represents the shaft portion 28 where the levers 26 are mounted. The hinge portion 52 is secured to the device leveling 8 of the armor mechanics 1.

The portions 46, 48, 50 and 52 of the shaft 28 are separated by circlips 53.

According to a variant which is not shown in the figures, the portions of the shaft 28 are separated by shoulders having a diameter along the plane P1 greater than the diameter d28 of the shaft 28.

The leveling device 8 is configured to actuate the shaft 28 of the levers 26 and move it between the weave configuration and the leveling configuration, in rotation around the axis X28 and in translation along the grooves 44.

The motor 10 is an asynchronous electric motor of low power, for example less than 500 W. The motor 10 is disposed on the same side of the shaft 28 as the leveling device 8. The arrangement of the motor 10 is not limiting: the motor 10 can be positioned, for example, opposite the leveling device 8 with respect to the shaft 28.

The leveling device 8 comprises an articulated leveling member 54 and a locking mechanism 56. As shown in FIG. figure 1 , the member 54 and the mechanism 56 are arranged on the same side of the system 6 of the levers 26. In particular, the member 54 and the mechanism 56 are disposed on either side of the plate 12 adjacent.

The position of the leveling device 8 is not limiting. Alternatively, the leveling device 8 is disposed opposite the cam assembly 4 relative to the shaft 28 or in another position along the axis X28.

The articulated leveling member 54 comprises a transmission system 58, two leveling rods 60 and an eccentric leveling member 62.

The transmission system 58 is, in the example shown in the figures, a screw-nut system. In particular, the system 58 comprises a threaded rod 64, a shoe 66, a lower guide 68 and a guide 70 upper.

The threaded rod 64 is positioned parallel to the plane P0 of the frame 2 and defines a longitudinal axis X64 which is parallel to this plane P0. The threaded rod 64 is secured to a rotating shaft of the motor 10 by means of a nozzle 72. Thus, the threaded rod 64 is rotatable about its axis X64.

The shoe 66 of the transmission system 58 is a threaded nut mounted on the threaded rod 64. The pad 66 thus comprises a tapping 74 adapted to receive the threaded rod 64 and two lateral bosses 76 configured to secure the leveling rods 60 to the pads 66 .

X66 is an axis of the shoe 66 which passes through the threaded thread 74. When the shoe 66 is mounted on the threaded rod 64, the axes X64 and X66 are coincident and fixed relative to the frame 2. A rotation of the threaded rod 64 induces thus a displacement of the shoe 66 along its axis X66. Thus, the shoe 66 is movable in translation along its axis X66 between a first position, called weaving position and represented at the figure 6 which corresponds to the weaving configuration of the shaft 28 of the levers 26, and a second position, referred to as leveling, and represented in FIG. figure 8 which corresponds to the leveling configuration of the shaft 28.

The shoe 66 is cast iron. Alternatively, the pad 66 is steel or bronze.

The threaded rod 64 is supported by two bearings 78 which are fixed to the rod 64 by means of pins 80. In addition, needle bearings 82 are provided bearing on the upper guide 70 in order to compensate for axial forces generated by the threaded rod 64.

The lower guides 68 and upper 70 are configured to guide the shoe 66 in its displacement along the axis X66 and to catch radial forces generated by the rod 64. The guides 68 and 70 are rails that form plan supports for the shoe 66. They form linear paths integral with the frame 2. The lower guide 68 is a steel strip. The lower guides 68 and upper 70 define contact surfaces which are made of pre-treated steel. Indeed, during the displacement of the pad 66, a good quality of the surfaces of the guides 68 and 70 optimizes the sliding and the range of the pad 66 under load.

The threaded rod 64 and the pad 66 are immersed in the lubricating oil bath of the frame 2 so that sliding contact of the pad on the rod is performed in the presence of oil between the weave and leveling configuration.

The rods 60 are configured to transmit a displacement force of the pad 66 to the eccentric leveling member 62. In practice, the leveling rods 60 are able to provide a torque C to the eccentric leveling member 62. leveling 60 has a first end 84 hinged to the eccentric leveling member 62 and a second end 86 hinged to a corresponding boss 76 of the pad 66. In practice, the leveling rods 60 are mounted as a yoke on the lateral bosses 76 of the pad 66. The leveling rods 60 are assembled using a plurality of screws and spacers. Thus, the leveling rods 60 form a single body rigid leveling. Each connecting rod 60 extends essentially along an axis X60 which connects the ends 84 and 86 of this connecting rod 60.

X84 is noted the hinge axis about which the first end 84 of a leveling rod 60 is articulated on the eccentric leveling member 62. X86 is also noted a hinge axis about which the second end 86 is hinged on the shoe 66. The axes X84 and X86 are parallel to each other and perpendicular to the axis X66 of the shoe 66. Thus, the axes X84 and X86 are also parallel to the axes X20 of the shaft 20 and X28 of the shaft 28 Each axis X60 interconnects the X84 and X86 axes.

The eccentric leveling member 62 is movable between two distinct positions respectively corresponding to the leveling and weaving configurations of the shaft 28. P2 is a plane of displacement of the eccentric leveling member 62. The plane P2 is the plane geometric which is parallel to the plane P1 and which contains the center of gravity of the eccentric leveling member 62 in its two distinct positions mentioned above.

Here, the eccentric leveling member 62 moves in the plane P2, that is to say that its center of gravity is contained in the plane P2 throughout its movement between its two distinct positions.

X62 denotes a longitudinal axis of the eccentric leveling member 62 which is perpendicular to the plane P2 and which passes through the geometric center of a connection zone of the eccentric leveling member 62 with the shaft of the levers 28.

X62 is a lateral axis of the eccentric leveling member 62, which connects the axis X84 of the eccentric leveling member and the axis X28 of the lever shaft perpendicularly. In the embodiment illustrated in Figures 1 to 9 the lever arm 88 extends substantially along the axis X62 'and the axis X62' belongs to the plane P2.

The eccentric leveling member 62 is articulated on the first ends 84 of the leveling rods 60, as described above. It is secured to the lever shaft 26. In particular, the eccentric leveling member 62 is a leveling lever which comprises a lever arm 88 and a central portion 90. The lever arm 88 is made of a yoke between the first ends 84 of the leveling rods 60. The central portion 90 has a central bore 92 which is centered on the axis X62. More specifically, the axis X62 is perpendicular to the section of the central bore 92 and passes through the center of the section, here circular, of this central bore 92. This section here forms the connection zone. In the mounted configuration of the leveling device 8, the axis X62 coincides with the axis X28 of the shaft 28 of the levers 26. Thus, the axis X62 of the eccentric member of leveling 62 is parallel to the axis X20 of the camshaft 18 and also to the hinge pins X84 and X86 of the leveling rods 60.

The central portion 90 comprises a slot 94 and a screw 96. The slot 94 is configured to adapt the bore 92 to the diameter d28 of the shaft 28 of the levers 26. The screw 96 is able to clamp the slot 94, so as to locking in the bore 92 the shaft 28 of the levers 26.

Thus, the eccentric leveling member 62 is movable, with the shaft 28 of the levers 26, rotating about its central axis X62, which coincides with the axis X28 of the shaft 28, and in translation along the grooves 44 turntables 12.

In practice, the eccentric leveling member 62 is movable, as described above, in the displacement plane P2. This P2 plan corresponds to the plan of figure 4 , 6 , 8 , 12 and 13 . A median plane of the rigid leveling member 60, equivalent to the plane of symmetry of inner surfaces of the rods 60 which constitute this member, coincides with the plane of displacement P2. The assembly formed by the leveling rods 60 and the eccentric leveling member 62 moves in the plane P2. The displacement plane P2 is perpendicular to the support plane P0 and parallel to the plane P1. Thus, the translation axis X66 of the shoe 66 is disposed in the plane of displacement P2, while the axes X20, X28, X62, X84 and X86 are perpendicular to the plane of movement P2. In addition, the displacement plane P2 is between the two end surfaces 45 of the shaft 28. The axis X60 is meanwhile parallel to the displacement plane P2.

The leveling rods 60 and the eccentric leveling member 62 are thus configured to generate a torque C on the shaft 28. The torque C is necessary to rotate the shaft 28 about its axis X28 of a configuration to the other.

The locking mechanism 56 of the leveling device 8 is configured to lock the shaft 28 and the leveling device 8 in the weaving and leveling configurations. The locking mechanism 56 comprises a lateral arm 98 and a rod 100.

The lateral arm 98 is integral with the shaft 28 of the levers 26. Thus, the lateral arm 98 is rotatable, with the shaft 28, around the central axis X28 of the shaft 28 between a first angular position, represented at figure 6 which corresponds to the weaving configuration of the shaft 28, and a second angular position, represented in FIG. figure 8 which corresponds to the leveling configuration of the shaft 28. The lateral arm 98 has a central portion 102 and an extension 104. The central portion 102 is secured around the shaft 28 of the levers 26, while the extension 104 extends radially to the axis X28 of the shaft 28 and is configured to articulate on the rod 100 at an axis X104.

The rod 100 is configured to transmit a locking force to the lateral arm 98 and thus to the shaft 28. The link 100 is articulated between the extension 104 of the lateral arm 98 and a fixed point 106 of a plate 12 of the frame 2 X106 is the axis about which the link is articulated on the plate 12. The rod 100 is steel and crescent between the axes of pivots X104 and X106. Thus, the rod 100 is movable about the axis X106 in the plane P1 between a third position, called weaving position and represented in FIG. figure 6 which corresponds to the weaving configuration of the shaft 28 of the levers 26, and a fourth position, referred to as leveling, and represented in FIG. figure 8 which corresponds to the leveling configuration of the shaft 28. The weaving configuration of the shaft 28 biases the link 100 resiliently in its third position. The distance measured between the axes X104 and X106 in the plane P1 is noted between e100. When the rod 100 is in its third position, the center distance e100 is equal to a first value. When the rod 100 is in its fourth position, the center distance e100 is equal to a second value. The first value of the center distance e100 is greater than the second value. The center distance e100 may for example be 201 mm in third position and 199 mm in fourth position. Due to this difference in values of the center distance e100, when it is in its third position, the link 100 is in tension and constitutes means of elastic recalls for the leveling device able to maintain the arm 98 in its first position. angular, in other words able to keep the tree in its weaving position.

According to a variant which is not shown in the figures, the leveling device 8 comprises two identical locking mechanisms 56 and arranged on either side of the system 6 of the levers 26.

Finally, the armor mechanics 1 comprises a plurality of sensors 107 of the position of the shaft 28. The position sensors 107 are of the non-contact type and able to detect the end of travel in the weaving configuration and in the leveling configuration. of the shaft 28 to control the movement of the motor and the side arm 98 between two positions.

The operation of the armor mechanics 1 is described below:
When the loom is in the weaving phase, the shaft 28 of the levers 26 is in its weaving configuration. In particular, the shoe 66 is in its first position. Thus, as represented in figures 1 and 6 , the leveling rods 60 are perpendicular to the plane P0 of the frame 2. The orthogonal projections of the axes X60 and X62 ' in a projection plane perpendicular to the axis X28 of the lever shaft define an angle α in this plane of projection. This angle α is defined between these projections, on the side of the race of the pad 66 when it is in the weave configuration. The value of the angle α is between 80 ° and 100 °, preferably equal to 90 ° to 2 °. The projection plane is here confused with the displacement plane P2 defined above.

The orthogonal projections of the X60 and X66 axes in a projection plane perpendicular to the axis X28 of the lever shaft define an angle β in this projection plane. This angle β is defined between these projections, on the side of the race of the pad 66 when it is in the weave configuration. The value of the angle β is between 90 ° and 110 °, preferably close to 95 °, that is to say equal to 95 ° to 2 °. This projection plane is here confused with the displacement plane P2. Advantageously, the angle β close to 95 ° makes it possible to locate an axis X64 of the rod 64 close to the horizontal and a leveling rod 60 close to the vertical in the weaving configuration, which opposes the unlocking movement of the lever shaft 28.

In addition, the side arm 98 is in its first angular position, while the link 100 is in its third position. Thus, the shaft 28 is supported on the bottom 440 of the grooves 44 and locked by the locking mechanism 56. The follower rollers 42 of the levers 26 are in contact with the tracks 22 of the cams 18 of the cam machine 4. Thus, the rotation of the shaft 20 around the axis X20 generates the oscillating movements of the levers 26 which is transmitted, via the rods 30 and the levers 32, to the frames of the loom.

So that the loom can pass into the leveling phase, the leveling device 8 is actuated. The motor 10 is turned on and drives the threaded rod 64 in rotation about the axis X64. This rotation generates the movement of the shoe 66 from its first position to its second position. The pad generates a force E66 along its translation axis X66.

The force E66 generated by the shoe 66 induces the displacement of the leveling rods 60 and the eccentric leveling member 62. Thus, the leveling rods 60 and the eccentric leveling member 62 are driven by the shoe 66, as represented at figure 8 . In particular, the leveling lever 62 rotates around the axis X62 by an angle of between 45 ° and 100 °, preferably equal to 75 °.

As described above, the eccentric leveling member 62 transmits the torque C to the shaft 28. The shaft 28 rotates about its axis X28 and leaves the bottom 440 of the grooves 44 to move away.

The rotation of the shaft 28 also generates the rotation of the lateral arm 98 of the locking mechanism 56, towards its second angular position, and the movement of the link 100 towards its fourth position.

In addition, due to the rotation of the shaft 28, the follower rollers 42 are spaced from the cams 18. The levers 26 bear against the stop 27 and the loom is in the leveling configuration.

Then, to move from the leveling configuration to the weaving pattern of the loom, the motor 10 drives the threaded rod 64 in a reverse direction of rotation that moves the shoe 66 from its second position to its first position. The shoe 66 generates a force E66 'of equal intensity and opposite to the force E66. The force E66 'is transmitted to the connecting rods 60 and to the eccentric leveling member 62 which, similarly, generate a torque C' of equal intensity and opposite to the torque C. The shaft 28 is rotated around its X28 axis and reaches the weaving pattern again. Thus, the shaft 28 is supported at the bottom 440 of the grooves 44, the follower rollers 42 being again in contact with the cams 18 of the cam machine 4. The force E66 and the torque C may not be constant while during the movement of the shoe 66 between its second and first positions, because of the geometry of the joints of the leveling.

The Figures 10 to 13 show a second embodiment of the invention. The elements of the weave mechanism 1 of this second embodiment similar to those of the first embodiment bear the same references and are not described in detail insofar as the above description can be transposed to them.

The leveling device 8 of this second embodiment comprises an articulated member 54 and a connecting member 108. The device is not provided with the locking mechanism 56.

The eccentric leveling member 62 here bears the reference 62 '. The member 62 'here is identical to the member 62 and differs only for the fact that its axis X62 is distinct from the central axis X28 of the shaft 28.

The connecting member 108 comprises a first arm 110 and a second arm 112. The arms 110 and 112 are of cylindrical section and have a diameter substantially equal to the diameter d28 of the shaft 28. The arms 110 and 112 are arranged from and in particular of the shaft 28. In particular, the arms 110 and 112 are respectively fixed on one of the ends 45 of the shaft 28. The arm 110 is arranged in the bore 92 of the eccentric member of leveling 62 '. The arm 110 defines an axis X110 which is coincident with the axis X62 of the eccentric leveling member 62 '. The axis 110 is fixed relative to the frame of the mechanical. Thus, the eccentric leveling member is secured, indirectly, to the shaft 28, thanks to the arm 110.

The shaft 28 remains integral with the eccentric leveling member 62 'being mounted between the arms 110 and 112 of the connecting member 108 eccentrically relative to the eccentric leveling member 62'. Indeed, the central axis X28 of the shaft 28 is parallel and non-coinciding with the central axis X62 of the eccentric leveling member 62 '. We note e the distance between the axes X28 and X62.

The plates 12 are not provided with guide grooves 44. In contrast, the plates 12 each comprise a bearing 114 in which is arranged the shaft 28 along the axis X110.

The shaft 28 is rotatable about the axis X62 of the eccentric leveling member 62 'between the weave pattern and the leveling pattern. Indeed, the spacing e between the axes X28 and X62 allows the lever shaft 28 to travel, during its movement, an arc sufficient to move the axis X28 away from the shaft 28 of the axis X20 of the shaft 20 and thus lose the cam contact 18 with the follower rollers 42.

According to a variant not shown of this second embodiment of the invention, the shaft 28 is mounted on the connecting member 108 by means of rolling means such as plain bearings, roller bearings or other means of rotary guide arranged in the connecting member, so that the shaft 28 can rotate about its axis X28 and about the axis X62 of the eccentric leveling member 62 '.

According to a variant of the articulated leveling member 54 of the leveling device 8, which is shown in FIGS. Figures 14 to 16 and which is compatible with both embodiments of the invention described above, the transmission system 58 of the leveling device 8 comprises a single lower guide 68. The shoe 66 is equipped with two lateral claws 116 configured to take into account clevis the lower guide 68, so as to maintain contact between the shoe 66 and the lower guide 68. The lower guide 68 has an I-shaped or T-shaped profile and is fixed to the base 14 of the frame 2.

According to another variant which is not shown in the figures, the guides 68 and 70 comprise bearings, such as steel wheels, taken between the two guides 68 and 70.

According to yet another variant not shown, the articulated leveling member 54 comprises a single leveling rod 60 which for example is cantilevered or is clevised between two ears of the eccentric leveling member 62 when the one This is a leveling lever.

According to another variant which is not shown, the locking mechanism envisaged may vary in that the lateral arm 98 is omitted. The rod 100 is then attached directly to the assembly formed of the leveling rod 60 and the eccentric leveling member 62 '.

According to another variant represented in figure 17 the eccentric leveling member 62 'is replaced by an eccentric leveling member 63 which performs the same function. The eccentric leveling member 63 comprises a disc 65, for example circular or elliptical, which has a circular bore centered on the axis of articulation X84 around which the leveling rod 60 is pivotally mounted. An arm 120 is secured to the disc 65 and extends along a longitudinal axis X120. The axis X120 is fixed relative to the frame 2 of the machine 1. X63 is a longitudinal axis of the eccentric leveling member 63. The axes X63 and X120 are coincident. The X63 axis has the same function vis-à-vis the eccentric leveling member 63 as the X62 axis vis-à-vis the eccentric leveling member 62 mentioned above. The connection zone defined above corresponds here to the portion of the face of the disc 65 which is in direct contact with the arm 120.

A connecting member 121 connects the arm 120 to the shaft of the levers 28, so that the arm 120 and the shaft 28 are parallel to each other with a lateral offset e 'between the axes X28 and X120. The lateral offset e 'is measured perpendicular to the X28 and X120 axes. This connecting member 121 is fixed without degree of freedom to one end of the shaft 28 by fastening means such as assembly screws 123 received in the connecting member 121. The connecting member 121 is also fixed without degree of freedom at one end of the arm 120, for example with screw means identical to the screws 123. Thus, the eccentric leveling member 63 is integral with the shaft 28, thanks to the arm 120 and to the connecting member 121. Here, the arm 120 and the connecting member 121 form part of the eccentric leveling member 63. The disc 65 and the arm 120 advantageously represent a one-piece assembly rotatable in the frame 2, around the housing. X120 axis. The connecting member 121 could also be integral with the arm 120 and the disk 65. In other words, the entire disk 65, the arm 120 and the connecting member 121 form a crank articulated with the leveling rod 60 around the axis X84 and with the lever 26 around the axis X28.

Alternatively, the eccentric leveling member 63 does not include the arm 120 and the connecting member 121.

According to another variant represented in figure 18 , the shaft of the levers 28 is directly attached to an eccentric leveling member 63 ', which replaces the eccentric leveling 62. The eccentric leveling member 63 'is for example a cylindrical eccentric circular base, here identical to the disc 65. At its other end, the shaft of the levers 28 is fixed to another eccentric member 67 , for example identical to the eccentric leveling member 63 '. This is for example the common tree known to FR-A-2,868,090 . The shaft of the levers 28 is then supported relative to the frame 2 by means of the two eccentric members 63 'and 67 with bearings mounted in the frame 2. The eccentric leveling member 63' is rotatable about an axis of rotation X63 'perpendicular to the plane P2 and which passes through the center of the eccentric leveling member 63'. The axis X63 'has the same function vis-à-vis the eccentric leveling member 63' as the axis X62 vis-à-vis the eccentric leveling member 62 'mentioned above. This axis X63 'is parallel to the axis X28 and is arranged eccentrically with respect to this axis X63'. The axis X63 'is fixed relative to the frame 2. The distance between the axes X 63' and X 28 is denoted by "e" .The shaft of the levers 28 is able to rotate about the axis X 63 'between the configurations The eccentric leveling member 63 'here has a circular shape to ensure rotation in the scope of the frame 2.

Whatever the embodiment, the articulated member 54 is arranged so that the leveling rod (s) 60 is perpendicular (s) to the plane P0 of the frame 2 in the weaving phase. Thus, the leveling rod (s) 60 and the eccentric leveling member 62, 63 or 63 'define the angle α of 90 ° between them when the lever shaft 28 is in the weaving configuration.

The embodiments and alternatives contemplated above may be combined with one another to generate new embodiments of the invention.

Claims (15)

1. A shedding mechanism (1) for a weaving machine equipped with a level adjustment device (8) for a plurality of oscillating levers (26), the oscillating levers being provided with cam followers (42) and mounted on a shaft (28) of the levers, the shaft of the levers being movable between:

   - a weaving configuration, where the cam followers of the oscillating levers bear against cams (18) of the shedding mechanism, and

   - a level adjustment configuration, where the cam followers of the oscillating levers are separated from the cams of the shedding mechanism,

   the level adjustment device comprising a level adjustment picking cam member (62) secured to the shaft of the levers, and
   the shedding mechanism being characterized in that it further comprises:

   - a pad (66) translatable along a fixed axis (X66) between a first position corresponding to the weaving configuration of the shaft (28) of the levers (26) and a second position corresponding to the level adjustment configuration of the shaft of the levers, and

   - at least one level adjustment connecting rod (60) including a first end (84) mounted pivoting on the level adjustment picking cam member (62) around an axis (X84) of the connecting rod parallel to the central axis (X28) of the shaft of the levers and a second end (86) mounted pivoting on the pad (66) around an articulation axis (X86) of the pad parallel to the axis of the shaft of the levers.
2. The shedding mechanism (1) according to claim 1, characterized in that the translation axis (X66) of the pad (66) is perpendicular to the articulation axis (X86) of the level adjustment connecting rod (60) on the pad (66).
3. The shedding mechanism (1) according to claim 2, characterized in that, in the weaving configuration,

   - an orthogonal projection, in a projection plane perpendicular to the central axis (X28) of the shaft of the levers, of a longitudinal axis (X60) of the level adjustment connecting rod (60) that perpendicularly connects the axis (X84) of the level adjustment connecting rod (60) and the articulation axis (X86) of the pad (66), and

   - an orthogonal projection, in the same projection plane, of an axis (X62') that perpendicularly connects the axis (X84) of the level adjustment connecting rod (60) and the central axis (X28) of the shaft of the levers,

   define a first angle (α), the value of which is comprised between 80° and 100°, preferably equal to 90°, to within 2°.
4. The shedding mechanism (1) according to one of claims 2 or 3, characterized in that, in the weaving configuration,

   - an orthogonal projection, in a projection plane perpendicular to the axis of the shaft of the levers, of the translation axis (X66) of the pad (66), and

   - an orthogonal projection, in the same projection plane, of a longitudinal axis (X60) of the level adjustment connecting rod (60) that perpendicularly connects the axis (X84) of the level adjustment connecting rod (60) and the articulation axis (X86) of the pad (66)

   define, in the movement plane (P2), an angle (β) of the picking cam member whereof the value is comprised between 90° and 110°, preferably equal to 95° to within 2°, this second angle (β) being defined on the side of the travel of the pad (66) when it is in the weaving configuration.
5. The shedding mechanism (1) according to one of the preceding claims, characterized in that the shaft (28) of the levers (26) is:

   - guided in translation at each of its ends (45) by a guide slot (44) defined in a platen (12), and

   - translatable along an axis (X44) of each guide slot (44), between the weaving configuration and the level adjustment configuration.
6. The shedding mechanism (1) according to claim 5, characterized in that it further comprises:

   - a side arm (98) secured to the shaft (28) of the levers (26) and rotatable around the central axis (X28) of the shaft of the levers between a first angular position corresponding to the weaving configuration of the shaft of the levers and a second angular position corresponding to the level adjustment configuration of the shaft of the levers, and

   - at least one connecting rod (100) mounted pivoting on the level adjustment picking cam member (62) at one end (104) of the arm (98) around an axis (X104) of the arm and mounted pivoting on a frame (2) of the shedding mechanism (1) around an axis (X106) of the frame and movable between a third position corresponding to the weaving configuration of the shaft of the levers and a fourth position corresponding to the level adjustment configuration of the shaft of the levers.
7. The shedding mechanism (1) according to claim 6, characterized in that when the connecting rod (100) is in the third position, the center distance (e100) between the axis (X104) of the arm and the axis (X106) of the frame is equal to a first value, and when the connecting rod (100) is in the fourth position, this center distance (e100) is equal to a second value, the first value being greater than the second value.
8. The shedding mechanism (1) according to one of claims 1 or 4, characterized in that:

   - the level adjustment picking cam member (62'; 63; 63') is rotatable around a fixed axis (X110; X120; X63'),

   - the central axis (X28) of the shaft of the levers is parallel to and does not coincide with the rotation axis (X110; X120; X63') of the level adjustment picking cam member, and

   - the shaft of the levers is rotatable around the rotation axis (X110; X120; X63') of the level adjustment picking cam member between the weaving configuration and the level adjustment configuration.
9. The mechanism according to claim 8, characterized in that the level adjustment picking cam member (62'; 63) comprises an arm (110, 120) rotatable around the fixed axis (X110; X120), the arm extending parallel to the central axis (X28) of the shaft of the levers and securing the shaft of the levers (28) in rotation with the level adjustment picking cam member (62'; 63) eccentrically relative to the fixed axis (X110; X120).
10. The mechanism according to claim 8, characterized in that the level adjustment picking cam member (63') is directly fixed eccentrically to the shaft of the levers (28).
11. The shedding mechanism (1) according to one of the preceding claims, characterized in that the level adjustment picking cam member (62) is a level adjustment lever (62) that comprises at least one arm (88) mounted pivoting on the axis (X84) of the level adjustment connecting rod (60) and a central portion (90) secured in rotation with the shaft (28) of the levers.
12. The shedding mechanism (1) according to one of the preceding claims, characterized in that the pad (66) is a tapped nut that is mounted on a threaded rod (64) rotatable around the axis (X66) of the pad.
13. The shedding mechanism (1) according to claim 12, characterized in that threaded rod (64) is rotated around the axis (X66) of the pad (66) by an electric motor (10) fixed on a frame (2) of the shedding mechanism (1).
14. The shedding mechanism (1) according to one of the preceding claims, characterized in that the pad (66) is submerged in a lubricating oil bath of a frame (2) of the shedding mechanism (1).
15. A weaving machine including a shedding mechanism (1), characterized in that the shedding mechanism (1) is according to one of the preceding claims.

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