Rotary dobby and loom comprising such a dobby

Abstract

Rotary dobby and loom comprising such a dobby The present invention relates to a rotary dobby for a loom comprising a frame, a main shaft, an output lever shaft, a subassembly (200') formed of a first blade (202) and at least one second blade (204), mounted adjacent. The subassembly comprises a first output lever (42) and a first actuating rod (52) belonging to the first blade (202), a second output lever (44) and a second actuating rod (54) belonging to the second blade (204), an eccentric (56), mounted around the main shaft, comprising a first zone (56A) configured to cooperate with the first rod (52), a second zone (56B) configured to cooperate with a guide ring (59) and a third zone (56C) configured to cooperate with the second rod (54), and a coupling device (210). Figure for abstract: Figure 5

Description

Title of the invention: Rotary dobby and loom comprising such a dobby

[0001] The present invention relates to a rotary dobby for a weaving loom, as well as to a weaving loom comprising such a dobby.

[0002] The invention relates to the field of weaving looms and their shedding machines, in particular to the field of rotary dobbies for controlling heddle frames.

[0003] In the field of weaving, it is known to use dobby-type shedding machines for controlling heddle frames. In rotary dobbies, the alternating vertical movement of the heddle frames is ensured by pulling mechanisms controlled by actuating elements belonging to blades. These actuating elements are mounted on a main shaft of the dobby which is driven by an intermittent rotational movement and, each time this shaft stops, a readout device controls the securing of the actuating element with the shaft to control an oscillating part according to the weave to be obtained on the fabric being woven.

[0004] During weaving, when a frame does not require to be actuated up or down, the associated eccentric is retained in its angular position by retaining and immobilizing means such as jaw and return spring assemblies.

[0005] Certain textile applications, particularly for carpet weaving, involve the formation of a shed with significant dynamic frame forces. These dynamic forces increase when the frame is in a high or low position.

[0006] EP 1 845 181 A1 describes a rotary dobby for a weaving loom comprising, for each connecting rod-oscillating lever assembly, an eccentric-type actuating element for driving an actuating connecting rod into motion, thereby inducing the oscillating reciprocating movement of a heddle frame. When the eccentric must be held in an angular position, legs carried by the eccentric cooperate with a retaining arm.

[0007] EP 1 382 725 A1 and EP 3 556 920 A1 describe other rotary dobbies for which each frame is driven by an oscillating connecting rod-lever assembly controlled by an eccentric. The angular position of the eccentric is maintained by the cooperation of elements of the reading device with beaks provided on the eccentric.

[0008] However, these different dobby models do not allow us to support weaving applications for which the dynamic forces of the frame transmitted to a blade, in particular to the eccentric driving the blade, are significant and also for in which the warp thread tension forces are significant. In particular, the forces exerted when the eccentric must be maintained in an angular position are such that the retaining and immobilizing means described in the prior art do not sufficiently retain the eccentric, to the point that the heddle frames risk moving unexpectedly.

[0009] The invention therefore aims to remedy this drawback by providing a new rotary dobby capable of withstanding significant forces, in particular due to the tension of the warp threads, including when the heddle frames are in the high or low position of their vertical oscillating stroke.

[0010] The subject of the invention is a rotary dobby for a weaving loom comprising a frame, a main shaft supported by the frame and extending along a main axis, a shaft of the output levers, supported by the frame and extending along a common axis parallel to the main axis and at least one subassembly formed by a first blade and at least one second blade, mounted adjacent and respectively defining a first plane perpendicular to the main axis and a second plane perpendicular to the main axis. The subassembly comprises a first output lever belonging to the first blade and a second output lever belonging to the second blade, the first and second output levers being adjacent along the common axis, mounted to rotate about the shaft of the output levers and driven by an alternative oscillation movement during weaving, a first actuating rod belonging to the first blade,coupled to the first output lever and mounted so as to be mobile in rotation around the main shaft, a second actuating rod belonging to the second blade, coupled to the second output lever and mounted so as to be mobile in rotation around the main shaft, an eccentric mounted around the main shaft and comprising a first zone configured to cooperate with a first zone of the first connecting rod by constituting a first articulation, by means of which the eccentric and the first actuating rod are pivotable relative to each other around a first axis parallel to the main axis, a second zone configured to cooperate with a guide ring carried by the main shaft by constituting a second articulation, by means of which the eccentric and the main shaft are pivotable relative to each other around the main axis and a coupling device,able to selectively secure in rotation the main shaft and the eccentric in a coupled configuration of the coupling device, and to leave the eccentric free to rotate relative to the main shaft in a decoupled configuration of the coupling device. According to the invention, the eccentric comprises a third zone configured to cooperate with a first zone of the second connecting rod by constituting a third articulation, by means of which the eccentric and the second actuating connecting rod are, pivoting relative to each other around the first axis.

[0011] Thanks to the invention, the forces exerted by a stringer frame are distributed over two blades whose movement is synchronized thanks to a common eccentric, this synchronization allowing an optimized vertical alternating movement of the stringer frame.

[0012] According to other advantageous aspects of the invention, the rotary dobby for a weaving loom comprises one or more of the following characteristics, taken in isolation or in any technically possible combination:

[0013] - The coupling device comprises a driver secured to the main shaft, and two locks, articulated on the eccentric and capable of cooperating with the driver in the coupled configuration of the coupling device to secure the eccentric and the main shaft in rotation around the main axis.

[0014] - The first articulation comprises a first intercalated bearing, radially at first axis, between the eccentric and the first actuating rod, while the second articulation comprises a second bearing interposed, radially to the main axis, between the eccentric and the main shaft and the third articulation comprises a third bearing interposed, radially to the first axis, between the eccentric and the second actuating rod.

[0015] - The second bearing comprises rollers which extend parallel to the main shaft overlapping the foreground and the middle ground.

[0016] - The eccentric comprises a cylindrical element which has two spaced flanks of an axial gap greater than an axial distance between the first plane and the second plane, an outer peripheral surface, which defines the first zone as a first raceway for the first bearing and the third zone as a third raceway for the third bearing, and a bore whose inner surface defines the second zone as a second raceway for the second bearing.

[0017] - The eccentric comprises retaining means and the dobby comprises means for immobilizing the eccentric, the immobilizing means being configured to engage with the retaining means when the coupling device is in the uncoupled configuration or when the eccentric is in a stop position around the main shaft.

[0018] - First immobilizing means are mounted on a front surface of the first actuating rod or on a front surface of the second actuating rod and comprise elastic return means configured to return to the engagement position of the immobilization means with retaining means.

[0019] - The dobby comprises second immobilization means adapted to select tively operate the coupling device between the decoupled configuration and the coupled configuration in the eccentric stop position.

[0020] - A first retaining means and a first immobilizing means are centered on a third plane perpendicular to the main axis and located between the first plane and the second plane.

[0021] - The coupling device is centered on a fourth plane perpendicular to the main axis and a second retaining means and a second immobilizing means are centered on the fourth plane.

[0022] - The first and / or second retaining means comprises a plate centered on the third or fourth plane perpendicular to the main shaft and riveted to one side of the cylindrical element of the eccentric.

[0023] - The cylindrical element of the eccentric comprises a chamber arranged between the two sides of the cylindrical element, having an opening on the external peripheral surface of the cylindrical element and configured to at least partially receive a plate belonging to the first retaining means.

[0024] - The dobby comprises a modulator configured to mechanically modulate the rotation of the main shaft from the rotation of a dobby drive shaft and, during the continuous rotation of the drive shaft, the main shaft performs a rotary movement marked by an alternating movement of amplitude at the stop position of the eccentric.

[0025] The invention also relates to a loom comprising a rotary dobby as mentioned above and a drawing mechanism for controlling a heddle frame, this drawing mechanism comprising at least one set of connecting rods and return levers coupling the heddle frame to the first blade and to the second blade and configured to return an alternating oscillating movement of the first output lever and the second output lever to the heddle frame, the heddle frame having an alternating movement between a high position and a low position.

[0026] According to other advantageous aspects of the invention, the weaving loom comprises one or more of the following characteristics, taken in isolation or in any technically possible combination:

[0027] - The pulling mechanism comprises a first attack rod, coupled to the first output lever of the first blade and which drives at least a first return lever on which a first connecting rod is coupled to the frame, and a second attack connecting rod, coupled to the second output lever of the second blade and which drives at least a second return lever on which a second connecting rod is coupled to the frame, while the first and second connecting rods to the frame are coupled to the same stringer frame.

[0028] - The pulling mechanism comprises a first staple and a second staple adjustable, respectively mounted on the first output lever and the second lever dobby outlet and configured to provide pivotal assembly and adjustment of the first outlet lever and the second outlet lever with the pull mechanism and the staples are secured to each other.

[0029] The invention will appear more clearly on reading the following description of two embodiments of a dobby and a weaving loom in accordance with its principle, given solely as a non-limiting example, and made with reference to the drawings in which:

[0030] [Fig-1] [Fig. 1] is a partial view of a loom according to a first embodiment of the invention, incorporating a dobby according to the invention;

[0031] [Fig.2] [Fig.2] is an exploded perspective view of twin blades of the loom weave from [Fig.l];

[0032] [Fig.3] [Fig.3] is a perspective view, with the hood open, of the dobby of [Fig.l],

[0033] [Fig.4] [Fig.4] is a perspective view of an actuating mechanism of the twin blades of [Fig.2], insert A highlighting the driving blade and insert B highlighting the driven blade,

[0034] [Fig.5] [Fig.5] is a partial exploded view of the actuating mechanism of the [Fig.4],

[0035] [Fig.6] [Fig.6] is a partial front view of the actuating device of the [Fig.4] ,

[0036] [Fig.7] [Fig.7] is a perspective view similar to insert A) of [Fig.4], of a mechanism for actuating twin blades of the type shown in [Fig.2], this actuating mechanism belonging to a dobby according to a second embodiment, and

[0037] [Fig.8] [Fig.8] is a graphical representation of the law of motion of the mo dobby controller of [Fig.3],

[0038] [Fig.9] [Fig.9] is a perspective view of a length adjustment device of the connecting rods of the loom of [Fig.l].

[0039] [Fig.l] shows a partial view of a loom M according to the invention. The loom M comprises heddle frames 2, only two of which are shown in [Fig.l] for the sake of simplification and which are each actuated by a drawing mechanism 4 connected to a rotary dobby R.

[0040] The rotary dobby R is a shedding machine of the loom M whose function is to actuate the drawing mechanisms 4 of the heddle frames 2, to determine the weave of the fabric produced by the loom M.

[0041] The loom comprises a beam E, on which warp threads 6 are wound before passing through eyelets 8a belonging to heddles 8 carried by the heddle frames 2. Insertion means, not shown, make it possible to insert one or more weft threads into the shed formed by the warp threads moved in height. by the heddle frames 2, so as to form at least one fabric T which is wound onto a reel B, at the exit of the loom M.

[0042] In [Fig.l], only a few warp threads 6 and a few heddles 8 are shown, for the sake of clarity of the drawing.

[0043] A pulling mechanism 4 comprises, for each heald frame 2, an assembly formed of connecting rods to the frame, return levers, at least one horizontal connecting rod and at least one attack connecting rod connected, by means of a clip to a blade of the rotary dobby R.

[0044] The rotary dobby R and consequently the loom M according to the invention comprise two types of blades: single blades 200 and sub-assemblies 200' of twin blades.

[0045] For a first type of pulling mechanism 4, the connecting rods to the frame 10 are coupled to the heald frame 2 and mounted by means of the return levers 12 on a horizontal connecting rod 14. The horizontal connecting rod 14 is connected to a driving connecting rod 16. The driving connecting rod 16 is connected by means of a clip 18 to a single blade 200 of the rotary dobby R.

[0046] Each single blade 200 actuates a heald frame 2 by a pulling mechanism 4. A single single blade 200 is shown in the figures and actuates, via the associated pulling mechanism 4, the heald frame 2 shown furthest back and to the right in [Fig.l]. The pulling mechanism 4 associated with a single blade 200 comprises, for example, four connecting rods to the frame 10. The single blades 200 are of the type of those of the dobbies described in EP 1 845 181 A1, EP 1 382 725 A1 and EP 3 556 920 A1

[0047] A single subassembly 200' is shown in the figures and actuates, via the associated pulling mechanism 4, the heald frame 2 shown furthest forward and to the left in [Fig.l].

[0048] Each subassembly 200' comprises two twin blades 202 and 204, namely a first single blade 202 and an adjacent second single blade 204. The first blade 202 may be referred to as a "leading" blade and the second blade 204 may be referred to as a "driven" blade. A subassembly 200' of twin blades 202, 204 may also be referred to as a double blade.

[0049] A pulling mechanism 4 associated with a subassembly 200' is of a second type and makes it possible to actuate a single heald frame 2 from the first and second twin blades 202 and 204 of this subassembly 200'. Such a pulling mechanism 4 is shown in [Fig.2].

[0050] The first blade 202 is connected to a first driving rod 162 by a clip 182. The first driving rod 162 is connected to a first horizontal rod 142. The first horizontal rod 142 drives a plurality of first return levers 122. On at least one return lever 122 is coupled a first rod to the frame 102. The first connecting rods to the frame 102 are attached to the stringer frame 2, more particularly to its lower crosspiece 2a.

[0051] The second blade 204 is connected to a second driving rod 164 by a clip 184. The second driving rod 164 is connected to a second horizontal rod 144. The second horizontal rod 144 drives a plurality of second return levers 124. On at least one return lever 124 is coupled a second rod to the frame 104. The second rods to the frame 104 are coupled to the heald frame 2, more particularly to its lower crosspiece 2a.

[0052] The first connecting rods to the frame 102 and the second connecting rods to the frame 104 are coupled to the same heald frame 2, preferably to the same lower crosspiece 2a. The first and second blades 202 and 204 of the double blade 200' therefore actuate the same heald frame 2. The simultaneous actuation of the same heald frame 2 by the two twin blades 202, 204 of a subassembly 200' makes it possible to distribute the forces exerted by the heald frame 2 on the two blades 202, 204.

[0053] In the example of [Fig.2], the stringer frame 2 is driven by a pair of connecting rods to the frame 102 and by a pair of connecting rods to the frame 104. The pairs of connecting rods to the frame 102 and 104 are adjacent.

[0054] The connecting rods to the frame 104 actuated by the second blade 204 are positioned closest to the dobby R, on the heald frame 2, relative to the connecting rods to the frame 102 actuated by the first blade 202.

[0055] Alternatively, other distributions of the connecting rods to the frame 102 and 104 are conceivable.

[0056] The clips 18, 182, 184 make it possible to secure the driving connecting rods 16, 162, 164 to the blades 200, 202, 204 respectively. The positioning of the clips 18, 182, 184 is adjustable in height along the blades 200, 202, 204. This height positioning determines the amplitude of the shed formed downstream of the heald frame 2. In Figures 2 to 5, the clips 182, 184 of the blades 202, 204 are positioned at the maximum height. This maximum height makes it possible to have the greatest possible shed amplitude.

[0057] Advantageously, the clip 182 of the first blade 202 and the clip 184 of the second blade 204 are secured. This securing allows a common adjustment of the shed amplitude for the blades 202, 204 and ensures optimal vertical movement of the heald frame 2.

[0058] Advantageously, the first and second clips 182 and 184 are secured together by means of a key 186 which passes through two orifices 188 respectively provided in the first and second clips. In Figures 3 and 4, the key 186 is represented by its longitudinal axis and only the orifice 188 of the first clip 182 is visible.

[0059] In practice, the loom M comprises several single blades 200 and several twin blades 202, 204 constituting subassemblies 200'. For example, eight single blades 200 driving eight heald frames 2 and eight twin blades 202, 204 constituting four subassemblies 200' driving four heald frames 2. Other numbers of single and double blades are possible as a variant.

[0060] According to another embodiment not shown, the loom M only comprises twin blades 202, 204.

[0061] The correct realization of the vertical movement of the stringer frame 2 actuated by the subassembly 200' is ensured by the synchronized movement of the twin blades 202, 204.

[0062] The rotary dobby R comprises, for each pair of twin blades 202, 204, a twin blade drive device 206 which is described in detail in the remainder of the description.

[0063] As visible in [Fig.3], the rotary dobby R comprises a frame 22 which constitutes a fixed part of the dobby R. The frame 22 is a rigid structural part of the dobby R. The frame 22 is advantageously a casting part, or possibly a set of mechanically welded parts. A cover, not shown, is fixed on the frame 22. The frame 22 and the cover define an interior volume of the rotary dobby R, enclosing the different internal parts of the dobby R described below.

[0064] The frame 22 comprises a base 22A. The frame 22 comprises two support plates 23 and 24, located in the interior volume of the frame 22. The plates 23 and 24 project upwards from the base 22A of the frame 22.

[0065] The dobby R comprises a main shaft 32 supported by the frame 22, in its interior volume. The main shaft 32 is supported at one end by the plate 23, via a pivot connection of the plate 23, and at an intermediate part of the main shaft 32 by the plate 24, via a pivot connection of the plate 24. The main shaft 32 extends along a main axis X32 which is an axis of rotation of the main shaft.

[0066] The dobby R comprises a shaft of the output levers 34 supported by the frame 22, in its interior volume. The shaft of the output levers 34 is supported at its ends by the plates 23 and 24. The shaft of the output levers 34 extends along a common axis X34. The common axis X34 is parallel to the main axis X32. The axis of the levers 34 is preferably fixed in rotation around its axis X34 relative to the frame 22.

[0067] The main shaft 32 is driven by an intermittent rotational movement with a stop every half-turn.

[0068] The rotation of the main shaft 32 is carried out by a modulator 36 and a bevel gear 38 comprising a crown 38a and a pinion 38b. The modulator 36, adjacent to the plate 24, is mechanically connected to the main shaft 32. The bevel gear 38 is mechanically connected to a control shaft 40 of the dobby R. The control shaft 40 is partially located outside the frame 22 and extends according to an axis X40 perpendicular to the axis X32. The modulator 36 and the bevel gear 38 transform the continuous rotational movement of the control shaft 40 into the intermittent rotational movement of the main shaft 32.

[0069] The main shaft 32 has a driving function for driving the blades 20. To do this, the main shaft 32 receives a series of driving devices allowing each blade 20 to be set in motion.

[0070] A single blade 200 and a double blade 200' with a pair of twin blades 202, 204 are shown in [Fig.3].

[0071] Each single blade 200 is associated with a drive device of the type of drive device described in detail in EP 1 845 181 AL

[0072] Each pair of twin blades 202, 204 is associated with a drive device 206 shown in FIGS. 4 to 6. Advantageously, the dobby R comprises as many twin blade drive devices as there are pairs of twin blades 202, 204, i.e. double blades 200'. In practice, in a rotary dobby of standard size, it is possible to provide, for example, between two and eight pairs of twin blades 202, 204 and thus between two and eight drive devices 206 for twin blades 202, 204.

[0073] The drive device 206 comprises a kinematic chain 208 coupled to a coupling device 210. These two elements 208 and 210 make it possible to selectively subject, that is to say to link, the rotation of the main shaft 32 to the movement of the blades 202, 204.

[0074] The first blade 202 comprises a first output lever 42 and a first actuating rod 52. The first blade 202 defines a first plane P2 perpendicular to the main axis X32.

[0075] The second blade 204 comprises a second output lever 44 and a second actuating rod 54. The second blade 204 defines a second plane P4 perpendicular to the main axis X32.

[0076] The first output lever 42 is preferably of a flat and thin shape like a plate. The first output lever 42 is partially contained in the frame 22, for a first part carried by the shaft of the output levers 34 and also comprises a second part in the form of an arm which extends out of the dobby R by crossing the cover. For this purpose, the cover of the dobby R comprises one or more openings. The first output lever 42 is mounted to be able to rotate around the shaft of the output levers 34. During weaving, the first output lever 42 is driven by an alternating oscillation movement around the common axis X34.

[0077] In a manner known per se, the first actuating rod 52 is coupled to the first output lever 42.

[0078] The first actuating rod 52 is mounted to be able to rotate around the shaft main 32.

[0079] The first actuating rod 52 is articulated on an eccentric 56.

[0080] The eccentric 56 comprises a cylindrical element 57. The cylindrical element 57 is defined by two flat flanks 571 and 572, an external peripheral surface 573 and a central bore 574.

[0081] Preferably, the cylindrical element 57 is a single piece. In an alternative not shown, the cylindrical element 57 is made in two parts which are screwed or welded together.

[0082] The two flat flanks 571 and 572 of the cylindrical element 57 are spaced apart by an axial distance, measured along the main axis X32, greater than the axial distance, measured along the main axis X32, between the first plane P2 defined by the first blade 202 and the second plane P4 defined by the second blade 204.

[0083] A first zone 52A of the first actuating rod 52 cooperates with a first zone 56A of the eccentric 56 to constitute a first articulation. By means of this first articulation, the first actuating rod 52 and the eccentric 56 are pivotable relative to each other around a first axis XI parallel to the main axis X32, but radially offset from the latter by a non-zero distance.

[0084] The first zone 52A of the first actuating connecting rod 52 corresponds to the inner surface of a central bore of the connecting rod 52. Preferably, as shown in [Fig.5], the first zone 52A accommodates a cage 521 and balls 522 defining a first bearing.

[0085] The first zone 56A of the eccentric 56 belongs to the external peripheral surface 573 of the cylindrical element 57 of the eccentric 56. The first bearing is interposed, radially to the axis XI, between the first actuating rod 52 and the eccentric 56. The first zone 56A of the eccentric constitutes a first rolling track for the first bearing.

[0086] The second output lever 44 is preferably of the same shape as the first output lever 42. In a similar manner to the first output lever 42, the second output lever 44 is partially contained in the interior volume of the frame 22. The second output lever 44 is mounted to rotate about the shaft of the output levers 34, which is thus a shaft common to the different levers. The second output lever 44 is adjacent to the first output lever 42 along the common axis X34. The first output lever 44 is driven by the same reciprocating oscillation movement during weaving as the first output lever 42.

[0087] The second actuating rod 54 is coupled to the second output lever 44. The second actuating rod 54 is mounted to be able to rotate around the main shaft 32.

[0088] The second actuating rod 54 is also articulated on the eccentric 56.

[0089] A first zone 54A of the second actuating rod 54 cooperates with a third zone 56C of the eccentric 56 to constitute a third articulation. By means of this third articulation, the second actuating rod 54 and the eccentric 56 are pivotable relative to each other around the first axis XL

[0090] The first zone 54A of the second actuating connecting rod 54 corresponds to the inner surface of a central bore of the connecting rod 54. Preferably, the first zone 54A accommodates a cage 541 and balls 542 defining a third bearing.

[0091] The third zone 56C of the eccentric 56 belongs to the external peripheral surface 573 of the cylindrical element 57 of the eccentric 56. The third bearing is interposed radially between the second actuating rod 54 and the eccentric 56. The third zone 56C constitutes a third raceway for the third bearing.

[0092] Advantageously, the first zone 56A constituting the first rolling track for the first bearing articulating the first actuating rod 52 to the eccentric 56 and the third zone 56C constituting the third rolling track for the third bearing articulating the second actuating rod 54 to the eccentric 56 belong to the same surface 573 ensuring perfect parallelism of the articulations linking the actuating rods 52, 54 to the eccentric 56.

[0093] In a variant not shown, the balls 522 and / or 542 can be replaced by rollers.

[0094] According to another variant, also not shown, the inner surface of the central bore of the first actuating rod 52 and / or of the second actuating rod 54 comprises a groove configured to receive in support balls or rollers carried by the first zone 56A and / or the third zone 56C of the eccentric 56 and to define a first bearing and / or a third bearing.

[0095] In another variant not shown, the central bore of the first connecting rod 52 corresponding to the first zone 52A and / or the central bore of the second connecting rod 54 corresponding to the first zone 54A receives a smooth bearing or a bushing. The plain bearing or the bushing is interposed, radially to the axis XI, between the first actuating rod 52 and the eccentric 56 and / or between the second actuating rod 54 and the eccentric 56, so as to form the first articulation which is a pivot connection between the first actuating rod 52 and the eccentric 56 and / or the third articulation which is a pivot connection between the second actuating rod 54 and the eccentric 56. As a variant, the bearing or the bushing can be mounted sliding, or clamped, or even be a single piece of the eccentric 56, of the first actuating rod 52 or the second actuating rod 54.

[0096] The eccentric 56 is common to the first actuating rod 52 and to the second actuating rod 54. Advantageously, the eccentric 56 is shared for the two twin blades 202 and 204 forming the subassembly 200'. This sharing guarantees the synchronized actuation of the blades 202 and 204 by the eccentric 56.

[0097] To enable this synchronized actuation, the eccentric 56 is articulated to a guide ring 59 carried by the main shaft 32. A second zone 56B of the eccentric 56 cooperates with the guide ring 59 to constitute a second articulation. By means of this second articulation, the eccentric 56 and the main shaft 32 are pivotable relative to each other around the main axis X32.

[0098] The guide ring 59 carries on its external peripheral surface a cage 591 and rollers 592 together defining a zone 59A for articulation of the guide ring 59, in the form of a second bearing. The rollers 592 of the second bearing extend parallel to the main shaft 32, overlapping the first plane P2 defined by the first blade 202 and the second plane P4 defined by the second blade 204. The width of the rollers 592, measured parallel to the main axis X32 and greater than in the drive device of a single blade 200, makes it possible to withstand significant forces transmitted by the heald frames 2 to the pulling mechanism 4 and to guarantee a longer service life of the bearing. This is particularly advantageous on a bearing diameter for which the dimensioning in the plane P2 or the plane P4 cannot easily be revised without considerably increasing the size of the complete machine.

[0099] The second zone 56B of the eccentric 56 belongs to the inner surface of the bore 574. The second bearing is interposed, radially to the main axis X32, between the guide ring 59 and the eccentric 56. The second zone 56B of the eccentric constitutes a second raceway for the second bearing.

[0100] In a variant not shown, the rollers 592 can be replaced by balls.

[0101] According to another variant, also not shown, the outer surface of the guide ring 59 comprises a groove configured to receive in support balls or rollers carried by the second zone 56B of the eccentric 56 and define a second bearing.

[0102] In a variant not shown, the bore 574 of the eccentric 56 receives a smooth bearing or bushing. The smooth bearing or bushing is interposed, radially to the central axis X32, between the eccentric 56 and the guide ring 59 so as to form the second articulation which is a pivot connection between the eccentric 56 and the guide ring 59.

[0103] The drive device 206 also comprises a coupling device 210. The coupling device 210 is capable of selectively securing, in rotation around the main axis X32, the main shaft 32 and the eccentric 56 in a coupled configuration of the coupling device 210, and to leave free, in rotation around the main axis X32, the eccentric 56 relative to the main shaft 32 in a decoupled configuration of the coupling device 210.

[0104] In other words, when the coupling device 210 is in a coupled configuration, the rotation of the main shaft 32 sets the first output lever 42 and the second output lever 44 in motion in a synchronized manner. In the uncoupled configuration of the coupling device 210, the output levers 42 and 44 are not set in motion by the main shaft 32, whether the main shaft 32 is rotating or stationary. Preferably, in the uncoupled configuration, the output levers 42 and 44 are held in a fixed position relative to the frame 22, the position in which the levers 42 and 44 were left at the time of switching from the coupled configuration to the uncoupled configuration. For example, this position corresponds to a high or low position of the associated heald frame 2.

[0105] Advantageously, the coupling device 210 comprises a driver 62, a pair of locks 64 and 65, a slider 68 (visible in [Fig.6]) and a reading device 70.

[0106] Between two contiguous eccentrics 56, the main shaft 32 is integral in rotation with the driver 62, the central opening 062 of which is substantially circular and provided with two teeth 621. The two teeth 621 are engaged in longitudinal grooves of corresponding shapes 32a formed on the periphery of the main shaft 32. The external peripheral edge 622 of the driver 62 is provided with four notches 63 which define four shoulders 622A, 622B, 622C, 622D formed in the edge of the driver 62.

[0107] Two locks 64 and 65, visible in detail in [Fig.6], are respectively articulated around two shafts 66A and 66B fixed on the eccentric 56 and each defining an axis of rotation X64 and X65 of the locks 64 and 65. The axes X64 and X65 are parallel to the main axis X32.

[0108] The first lock 64 comprises a first arm 641 which extends in a radial direction relative to the axis X64 and the end 642 of which can be engaged in two of the notches 63, to the point that its terminal surface 643 can then come to bear against one of the shoulders 622A and 622C. The lock 64 also comprises a second radial arm 644 the end 645 of which is engaged in a fork formed at the end 681 of a slide 68. The slide 68 is mounted on the eccentric 56 and is movable in translation in both directions in a direction D68 radial relative to the main axis X32. The first lock 64 is also subjected to the action of an elastic return means, for example a return spring 67.

[0109] The second lock 65 has the same geometry as the lock 64 and comprises two arms 651 and 654 which extend radially relative to X65 and whose respective ends 652 and 655 are intended to cooperate respectively with the shoulders 622B and 622D and with the slide 68. The terminal surface 653 of the arm 651 is intended to come selectively into abutment against the shoulders 622B and 622D.

[0110] When the driver 62 is driven by the main shaft 32 in the direction of the arrow F62 of [Fig. 6], the surfaces 653 and 622B form a first interface for transferring a rotational force from the driver 62 to the eccentric 56. The surfaces 643 and 622A form a second interface for transferring the rotational force from the driver 62 to the eccentric 56.

[0111] In other words, when the coupling device 210 is in the coupled configuration, the locks 64 and 65 are engaged in notches 63 of the driver 62. The rotation of the main shaft 62 is then transmitted to the eccentric 56. The eccentric 56 sets in motion, in a synchronized manner by the actuating rods 52 and 54, respectively the first output lever 42 and the second output lever 44.

[0112] When the coupling device 210 is in the decoupled configuration, the locks 64 and 65 are released from the notches 63 of the driver 62. The rotation of the main shaft 32, therefore the rotation of the driver 62, is not transmitted to the eccentric 56 and the output levers 42 and 44 remain in the fixed position.

[0113] According to an advantageous aspect of the invention, the fork provided at the end 681 of the slider 68 is symmetrical with respect to the plane defined by the axis X32 and by the direction D68. The fork provided at the end 681 of the slider cooperates in an identical manner with the end 645 of the first lock 64 and with the end 655 of the second lock 65. In other words, the slider 68 actuates the two locks 64 and 65 in a similar and synchronized manner. Also, the slider 68 transmits in a similar and synchronized manner the movement of one lock 64, 65 to the other of the locks 64, 65.

[0114] It is possible to implement coupling devices 210 with a different operation from that described in this example, without departing from the scope of the invention, provided that these coupling devices 210 have the aforementioned coupled and decoupled configurations.

[0115] The slider 68 is intended to be actuated by the terminal beak 711 or 721 of an oscillating lever 71 or 72 controlled by the reading device 70. The oscillating levers 71, 72 are placed on the front surface 52B of the first actuating rod 52. The oscillating levers 71 and 72 are subjected to the action of two return springs 73 which tend to bring the beaks 711 and 721 into engagement with the slider 68 against a force exerted by the reading device 70. The reading device 70 is analogous to the reading device described in detail in EP 1 845 181.

[0116] When the terminal beak 711 or 721 of an oscillating lever 71 or 72 applies a centripetal force on the slide 68, against the return spring 67, the two locks 64 and 65 pivot around their respective axes X64 and X65, in a direction of release of the arms 641 and 651 towards the outside of the notches 63.

[0117] When the terminal beak 711 or 721 does not apply force to the slide 68, the action of the return spring 67 brings the lock 64 into an engaged position with the driver 62. In the engaged position, the terminal surface 643 of the lock 64 comes to bear against one of the shoulders 622A and 622C. By pivoting around the axis X64 to return to the engaged position, the lock 64 exerts, on the fork of the end 681 of the slide 68, a centrifugal force relative to the central axis X32. The slide 68 moves in the direction D68, moving away from the main axis X32. This translation of the slide towards the outside causes the rotation of the lock 65 around the axis X65. The lock 65 is then returned to an engaged position of its arm 651 in the opposite notch 63. In the engaged position, the terminal surface 653 of the lock 65 comes to bear against one of the shoulders 622B and 622D of the driver.

[0118] In other words, the tilting of the coupling device 210 from a coupled configuration to a decoupled configuration is controlled by the reading device 70 which then exerts a centripetal force by means of one of its oscillating levers 71 and 72 on the slide 68.

[0119] It is possible to implement other forms of slider 68 than that described in this example. Another mode of operation of the slider 68 which can be implemented, without departing from the scope of the invention, is described in EP 1 845 181 AL

[0120] Advantageously, the actuation of the two twin blades 202 and 204 requires only one coupling device 210 and one reading device 70. The pooling of the coupling device 210 and the reading device 70 makes it possible to ensure the synchronization of the actuation of the twin blades 202 and 204 and a saving of space in particular along the main shaft 32.

[0121] Advantageously, the identical and synchronized actuation of the two locks 64 and 65 by the slide 68 makes it possible to release the two locks 64 and 65 from the notches 63 of the driver 62 without a time lag. This is important in the application of this dobby for which tension forces of the warp threads at the opening of the shed can be very significant. These significant tension forces are directly transmitted to the locks 64 and 65 engaged in the driver 62.

[0122] These significant efforts also require a modification of the dynamics of the main shaft 32.

[0123] The switching of the coupling device 210 between the coupled configuration and the decoupled configuration is done under the control of the reading device 70 at each stopping time of the main shaft 32, that is to say at each rotation of a half-turn of the main shaft 32.

[0124] In this dobby R for which the locks 64 and 65 are subjected to significant forces, the stopping time of the main shaft 32 does not allow easy release of the locks 64 and 65. In particular when the driver 62 is driven by the main shaft 32 in the direction of the arrow F62 of [Fig. 6], the lock 65 is heavily loaded so that it presses on the shoulder 622B, because of the tension of the warp threads which transmits forces to the frame 2 and to the eccentric 56, and does not easily disengage from the notch 63.

[0125] Advantageously and to overcome this difficulty, the modulator 36 and, in particular, its cam tracks are modified. As illustrated in [Fig.8], the modulator 36 transforms the continuous rotation 0 of the control shaft 40 from 0° to 360° into an intermittent rotation movement 0' of the main shaft 32. The main shaft 32 performs a first rotation from 0 to 180°, i.e. a rotation of half a turn, for example in the clockwise direction. Then instead of a stopping movement at the end of this half turn, i.e. instead of maintaining a fixed angular position 0' at 0'=180°, the movement is alternated. The rotation angle 0' decreases by an amplitude A0', the main shaft 32 performs a rotation of amplitude A0' in the counterclockwise direction. The amplitude A0' of the alternating movement is advantageously between 0.5° and 5°, preferably equal to 1°.

[0126] During this alternating movement of the main shaft 32, the reading device 70 can control the release of the locks 64 and 65 from the notches 63 of the driver 62.

[0127] The main shaft 32 then performs a new rotation in the clockwise direction from 180° to 360°, that is to say a new rotation of half a turn, so as to complete a total of one complete rotation, that is 360°, when the control shaft performs one complete rotation.

[0128] The alternating movement produced makes it possible to reduce the forces undergone by the locks 64 and 65 in their respective notches 63 of the driver 62 and to guarantee their release from the notches 63 when the coupling device 210 switches between the coupled configuration and the uncoupled configuration.

[0129] When the coupling device 210 is in a decoupled configuration, the eccentric 56 is not subject to rotation of the main shaft 32. In this configuration, the output levers 42 and 44 are held in a fixed position relative to the frame 22. To ensure that the output levers 42 and 44 are held in a fixed position, the eccentric 56 comprises retaining means and the dobby R comprises immobilizing means. The immobilizing means are configured to engage in the retaining means when the coupling device is in the decoupled configuration so as to maintain the angular position of the eccentric 56. Maintaining the angular position of the eccentric 56 in the decoupled configuration of the coupling device makes it possible to maintain the fixed position of the output levers 42, 44, therefore of the stringer frame 2 controlled by the subassembly 200'.

[0130] As illustrated in [Fig.4], the eccentric 56 comprises two retaining means cooperating with two means for immobilizing the dobby R.

[0131] The eccentric 56 is extended laterally by a plate 58. The plate 58 is secured by riveting to the flank 571 of the cylindrical element 57 of the eccentric 56. A wedging surface 581 is provided on the periphery of the plate 58.

[0132] Each oscillating lever 71 or 72 of the reading device 70 is capable of cooperating by its terminal beak 711, 721 with the wedging surface 581 of the plate 58. In [Fig.4], the beak 711 of the oscillating lever 71 actuates the slide 68 and the beak 721 of the oscillating lever 72 cooperates with the wedging surface 581. After a rotation of 180 degrees of the eccentric 56, the beak 711 cooperates with the wedging surface 581 and the beak 721 actuates the slide 68.

[0133] Each oscillating lever 71, 72 is subjected to the action of a return spring 73. The spring 73 tends to return the terminal beak 711, 721 opposite the plate 58 to the position of engagement with the wedging surface 581 when the coupling device is in the decoupled configuration.

[0134] When the beak 711, 721 of the oscillating lever 71, 72 cooperates with the wedging surface 581 of the plate 58, the plate 58 is angularly immobilized, causing the angular immobilization of the eccentric 56.

[0135] In other words, a first retaining means formed by the wedging surface 581 of the plate 58 of the eccentric 56 cooperates with a first immobilizing means formed by the oscillating levers 71, 72 of the reading device 70 of the first actuating connecting rod 52.

[0136] The oscillating levers 71, 72 of the reading device 70 also make it possible to selectively actuate the coupling device 210 between the decoupled configuration and the coupled configuration in the stop position of the eccentric 56.

[0137] Advantageously, the oscillating levers 71, 72 are immobilization means pooling the functions of selection and immobilization of the eccentric.

[0138] The first retaining means and the first immobilizing means are centered on the same plane P5 perpendicular to the main axis X32 as the coupling device 210.

[0139] The cylindrical element 57 of the eccentric 56 comprises an internal chamber 575 visible on the insert B of [Fig.4], by tearing away. Along the main axis X32, the internal chamber 575 is arranged between the two flanks 571 and 572.

[0140] The internal chamber 575 includes an opening on the outer peripheral surface 573 of the cylindrical member 57.

[0141] The internal chamber 575 has for example a wavy shape consisting of two rounded openings 575A, 575B and a central groove 575C.

[0142] The internal chamber 575 is configured to at least partially receive an intermediate plate 84.

[0143] The intermediate plate 84 comprises two tabs adapted to be positioned respectively in each rounded opening 575A, 575B of the internal chamber 575. The intermediate plate 84 is secured by riveting, for example by two rivets, to the side of the eccentric 572 located opposite the second actuating connecting rod 54.

[0144] The intermediate plate 84 comprises a free edge 84A opposite the legs and located outside the internal chamber 575. The free edge 84A of the intermediate plate 84 comprises a wedging surface 841 formed at the periphery of the free edge 84A.

[0145] Advantageously, the coupling device 210 being shared between the first blade 202 and the second blade 204, an inter-space between the first actuating rod 52 and the second actuating rod 54 is available.

[0146] This interspace allows the passage of immobilization levers 86 and 87. The immobilization levers 86 and 87 are placed on the front surface 54B of the second actuating rod 54.

[0147] The immobilizing lever 86 is visible on the insert B of [Fig.4], by tearing away. The immobilizing lever 87 is located behind the oscillating lever in the representation of [Fig.4].

[0148] The immobilizing levers 86 and 87 are structurally identical to the oscillating levers 71, 72 of the smoothing device 70 but do not perform any actuating function.

[0149] The immobilizing levers 86 and 87 each comprise a terminal beak of a shape complementary to the wedging surface 841 of the intermediate plate 84, only the terminal beak 861 of the immobilizing lever 86 is visible on the insert B of [Fig.4] by tearing. Under the action of a return spring 88, the terminal beak 861 opposite the intermediate plate 84 cooperates with the wedging surface 841 to maintain the angular position of the eccentric 56.

[0150] In other words, a second retaining means formed by the wedging surface 841 of the intermediate plate 84 of the eccentric 56 cooperates with a second immobilization means formed by the immobilization levers 86, 87.

[0151] These second retaining and immobilizing means are centered on a third plane P3 perpendicular to the main axis X32. The plane P3 is located between the first plane P2 defined by the first blade 202 and the second plane P4 defined by the second blade 204.

[0152] Advantageously, the drive device 206 for twin blades 202, 204 benefits from a second retaining means and a second immobilizing means. These second retaining and immobilizing means are additionally tionals compared to the drive device of a single blade 200.

[0153] In the second embodiment shown in [Fig. 7], elements similar to those of the first embodiment bear the same references. If a reference is used in the remainder of the description without being shown in [Fig. 7] or shown in [Fig. 7] without being mentioned in the description, it designates the same element as that bearing the same reference in the first embodiment. In the following, we mainly describe what distinguishes this second embodiment from the first.

[0154] In the second embodiment, the eccentric 56 comprises a single retaining means cooperating with a single means for immobilizing the dobby R.

[0155] In this second embodiment, the oscillating levers 71 and 72 only fulfill a selection function. They do not constitute an immobilization means.

[0156] The eccentric 56 carries two tabs 91 provided with teeth 92 intended to come into engagement with corresponding teeth 93 arranged at the free end of an arm 94 pivotally mounted around an axis X94 on the first actuating rod 52 and subjected to the action of elastic means, for example a return spring 96 tending to return the teeth 93 into engagement with the teeth 92 of the tabs 91. The arm 94 constitutes an immobilization means.

[0157] The legs 91 and the arm 94 come into engagement, under the action of the return spring 96, when the eccentric 56 is in one of its two diametrically opposite stop positions. The legs 91 and the arm 94 are centered on the plane P5.

[0158] In a variant not shown, the retaining means are subjected to the action of a return spring which tends to return the retaining means into engagement with immobilization means.

[0159] The legs 91 are a means for retaining the eccentric 56 and the arm 94 is an immobilization means. The retaining and immobilization means are centered on the same plane P5 perpendicular to the central axis X32, as the coupling device 210.

[0160] In this second embodiment, a light 424 passing through each lever 42, 44 is provided, defining a bridge of material which extends over a peripheral angular sector of the shaft 34 and centered on the axis X34. The light 424 makes it possible to unload the rolling elements of the articulation of the lever 42, 44 around the axis X34, in a manner analogous to the inner bearing ring lights introduced in FR 1912808.

[0161] Advantageously, in the two embodiments of the invention mentioned above, the driving rod 16 is of adjustable length thanks to the adjustment device shown in [Fig.9]. The driving rod 16 extends along a first connecting rod axis X16.

[0162] The attack rod 16 comprises two flanges 170A and 170B mounted on an articulation 169 carried by the clip 18. The two flanges 170A and 170B are fixed on a bar 172. The bar 172 is generally parallelepiped in shape. The bar 172 comprises at one end 172A positioned on the side of the clip 18 a hook 172B. The second end of the bar 172 is inserted into a hollow tube 174. The hollow tube 174 forms the body of the driving rod 16. The hollow tube 174 also receives a rod 176. The rod 176 is held in the hollow tube 174 by means of holding screws 177. The rod 176 comprises, at one end located outside the hollow tube 174, a hook 176A. The length adjustment of the driving rod 16 is determined by the spacing between the hook 172B of the bar 172 and the hook 176A of the rod 176 measured along the first connecting rod axis XI6.

[0163] Advantageously, in the two embodiments of the invention mentioned above, the attack connecting rods 162, 164 are also adjustable in length by means of adjustment devices shown in [Fig.9] and identical to the adjustment device of the connecting rod 16.

[0164] The driving rod 162 comprises flanges 232A and 232B mounted on an articulation 222 carried by the clip 182. The two flanges 232A and 232B are riveted to a bar 242. The bar 242 comprises a hook 242B at one end 242A. The second end of the bar 242 is inserted into a hollow tube 252 forming the body of the driving rod 162. The hollow tube 252 also receives a rod 262. The rod 262 is held in the hollow tube 252 by means of holding screws 272. The rod 262 comprises, at one end located outside the hollow tube 252, a hook 262A. The driving rod 164 comprises flanges 234A and 234B mounted on a joint 224 carried by the clip 184. The two flanges 234A and 234B are riveted to a bar 244. The bar 244 comprises a hook 244B at one end 244A. The second end of the bar 244 is inserted into a hollow tube 254 forming the body of the driving rod 164. The hollow tube 254 also receives a rod 264.The rod 264 is held in the hollow tube 254 by means of retaining screws 274. The rod 264 comprises, at one end located outside the hollow tube 254, a hook 264A.

[0165] To ensure optimal vertical movement of the stringer frame 2, it is necessary for the length of the two driving rods 162 and 164 to be identical. Thus, the hooks 242B and 244B are configured to simultaneously receive a first end of a driving rod length adjustment tool and the hooks 262A and 264A are configured to simultaneously receive a second end of a driving rod length adjustment tool, the distance between the first end and the second end of the tool being manually modifiable, in particular by means of a screw compass type system for which the gap between the ends of the tool is manually adjusted by rotating a screw in one direction of rotation or an opposite direction. In other words, the connecting rod length adjustment tool bears simultaneously on the two pairs of hooks 242B, 244B and 262A, 264A to ensure equal adjustment between the two connecting rods 162 and 164..

[0166] According to a non-represented embodiment of the invention, legs and an arm comparable to the second embodiment are centered and cooperate in the plane P3.

[0167] According to a non-represented embodiment of the invention, means for retaining the eccentric and the associated immobilization means are doubled and centered both in the plane P3 and in the plane P5.

[0168] According to a non-represented embodiment of the invention, the first actuating rod 52 and the second actuating rod 54 have different geometries. In particular, the second actuating rod 54 has an opening of larger diameter than the diameter of the opening of the first actuating rod 52. The cylindrical element 57 of the eccentric 56 of the drive device has a shoulder on its external peripheral surface 573 so as to cooperate with the third bearing contained in the opening of the second actuating rod 54. This variant makes it possible to drive a synchronized movement of the first and second output levers 42 and 44 but with a different amplitude, in particular a greater amplitude of the movement of the second output lever 44.

[0169] Advantageously and in an embodiment not shown, the eccentric can define a fourth zone cooperating with a first zone of a third actuating rod and actuate three twin blades relating to the same heald frame 2. The corresponding blade is a triple blade.

[0170] According to yet another variant not shown, the number of twin blades within a subset may be strictly greater than three. In this case, the blade concerned may be quadruple, quintuple, etc.

[0171] In practice, the number of single blades 200 and twin blades 200' of the dobby R is variable, depending on the weave to be made on the fabric T. It is advantageously between 4 and 20.

[0172] As far as technically feasible, the above-mentioned embodiments and variants may be combined with each other.

Claims

Claims

1. A rotary dobby (R) for a loom (M), the rotary dobby comprising: - a frame (22); - a main shaft (32) supported by the frame (22) and extending along a main axis (X32); - an output lever shaft (34), supported by the frame (22) and extending along a common axis (X34) parallel to the main axis (34); - at least one subassembly (200') formed of a first blade (202) and at least one second blade (204), mounted adjacent and respectively defining a first plane (P2) perpendicular to the main axis (X32) and a second plane (P4) perpendicular to the main axis (X32), the subassembly comprising: • a first output lever (42) belonging to the first blade (202) and a second output lever (44) belonging to the second blade (204), the first (42) and second (44) output levers being adjacent along the common axis (X34), mounted to rotate around the shaft of the output levers (34) and driven by an alternating oscillation movement during weaving; • a first actuating connecting rod (52) belonging to the first blade (202), coupled to the first output lever (42) and mounted to move in rotation around the main shaft (32); • a second actuating rod (54) belonging to the second blade (204), coupled to the second output lever (44) and mounted to rotate around the main shaft (32); • an eccentric (56) mounted around the main shaft (32) and comprising: • a first zone (56A) configured to cooperate with a first zone (52A) of the first connecting rod (52) by constituting a first articulation, by means of which the eccentric (56) and the first actuating connecting rod (52) are pivotable relative to each other around a first axis (XI) parallel to the main axis (X32); • a second zone (56B) configured to cooperate with a guide ring (59) carried by the main shaft (32) by constituting a second articulation, by means of which the eccentric (56) and the main shaft (32) are pivotable relative to each other around the main axis (X32); • a coupling device (210), capable of selectively securing in rotation the main shaft (32) and the eccentric (56) in a coupled configuration of the coupling device (210), and of leaving the eccentric (56) free to rotate relative to the main shaft (32) in a decoupled configuration of the coupling device (210), characterized in that the eccentric (56) comprises a third zone (56C) configured to cooperate with a first zone (54A) of the second connecting rod (54) by constituting a third articulation, by means of which the eccentric (56) and the second actuating connecting rod (54) are pivotable relative to each other around the first axis (XI).

2. Rotary dobby according to claim 1, characterized in that the coupling device (210) comprises a driver (62) integral with the main shaft (32), and two locks (64, 65), articulated on the eccentric (56) and capable of cooperating with the driver (62) in the coupled configuration of the coupling device (210) to secure in rotation around the main axis (X32) the eccentric (56) and the main shaft (32).

3. Rotary dobby according to one of claims 1 and 2, characterized in that: - the first articulation comprises a first bearing (521, 522) interposed, radially to the first axis (XI), between the eccentric (56) and the first actuating rod (52); - the second articulation comprises a second bearing (591, 592) interposed, radially to the main axis (X32), between the eccentric (56) and the main shaft (32); - the third articulation comprises a third bearing (541, 542) interposed, radially to the first axis (XI), between the eccentric (56) and the second actuating rod (54).

4. A rotary dobby according to claim 3, characterized in that the second bearing (591, 592) comprises rollers (592) which extend parallel to the main shaft (32) overlapping the first plane (P2) and the second plane (P4).

5. Rotary dobby according to one of claims 3 or 4, characterized in that the eccentric (56) comprises a cylindrical element (57) which comprises: - two spaced flanks (571, 572) by an axial distance greater than an axial distance between the first plane (P2) and the second plane (P4), - an external peripheral surface (573) which defines the first zone (56A) as a first raceway for the first bearing (521, 522) and the third zone (56C) as a third raceway for the third bearing (541, 542), - a bore (574) whose internal surface defines the second zone (56B) as a second raceway for the second bearing (591, 592).

6. A rotary dobby according to any one of the preceding claims, characterized in that the eccentric (56) comprises retaining means (58, 84, 91) and in that the dobby (R) comprises immobilizing means (71, 72, 86, 87, 94) of the eccentric (56), the immobilizing means (71, 72, 86, 87, 94) being configured to engage with the retaining means (58, 84, 91) when the coupling device (210) is in the decoupled configuration or when the eccentric (56) is in a stop position around the main shaft (32).

7. Rotary dobby according to claim 6, characterized in that first immobilizing means (71, 72, 86, 87, 94) are mounted on a front surface (52B) of the first actuating rod (52) or on a front surface (54B) of the second actuating rod (54) and comprise elastic return means (73, 88, 96) configured to return to the engagement position of the immobilization means (71, 72, 86, 87, 94) with retaining means (58, 84, 91).

8. Rotary dobby according to one of claims 6 or 7, characterized in that it comprises second immobilization means (71, 72) adapted to selectively actuate the coupling device (210) between the decoupled configuration and the coupled configuration in the stop position of the eccentric (56).

9. Rotary dobby according to one of claims 6 to 8, characterized in that a first retaining means (84) and a first immobilizing means (86, 87) are centered on a third plane (P3) perpendicular to the main axis (X32) and located between the first plane (P2) and the second plane (P4).

10. Rotary dobby according to one of claims 6 to 9, characterized in that the coupling device (210) is centered on a fourth plane (P5) perpendicular to the main axis (X32) and in that a second retaining means (58, 91) and a second immobilizing means (71, 72, 94) are centered on the fourth plane (P5).

11. Rotary dobby according to claims 9 and 10, characterized in that the first and / or second retaining means (58, 84) comprises a plate (58, 84) centered on the third (P3) or the fourth plane (P5) perpendicular to the main shaft (32) and riveted on a flank (571, 572) of the cylindrical element (57) of the eccentric (56).

12. Rotary dobby according to claims 5 and 11, characterized in that the cylindrical element (57) of the eccentric (56) comprises a chamber arranged (575) between the two flanks (571, 572) of the cylindrical element (57), having an opening on the external peripheral surface (573) of the cylindrical element (57) and configured to receive at least partially a plate (84) belonging to the first retaining means.

13. Rotary dobby according to any one of the preceding claims, characterized in that the dobby (R) comprises a modulator (36) configured to mechanically modulate the rotation (0') of the main shaft (32) from the rotation (0) of a control shaft (40) of the dobby (R) and in that, during the continuous rotation (0) of the control shaft (40), the main shaft (32) performs a rotary movement (0') marked by an alternating movement of amplitude (A0') at the level of the stop position of the eccentric (56).

14. A loom comprising: - a rotary dobby (R) according to one of the preceding claims, - a drawing mechanism (4) for controlling a heddle frame (2), this drawing mechanism comprising at least one set of connecting rods (102, 104, 142, 144, 162, 164) and return levers (122, 124) coupling the heddle frame (2) to the first blade (202) and to the second blade (204) and configured to return an alternating oscillating movement of the first output lever (42) and the second output lever (44) to the heddle frame (2), the heddle frame (2) having an alternating movement between a high position and a low position.

15. A loom according to claim 14, characterized in that the drawing mechanism (4) comprises: - a first driving rod (162) coupled to the first output lever (42) of the first blade (202) and which drives at least one first return lever (122) on which a first rod is coupled to the frame (102), - a second driving rod (164) coupled to the second output lever (44) of the second blade (204) and which drives at least one second return lever (124) on which a second rod is coupled to the frame (104), and in that the first (102) and second (104) rods to the frame are coupled to the same heddle frame (2).

16. Weaving loom according to one of claims 14 and 15, characterized in that the drawing mechanism (4) comprises a first clip (182) and a second clip (184) which are adjustable, respectively mounted on the first output lever (42) and the second output lever (44) of the dobby (R) and configured to ensure the pivoting assembly and adjustment of the first output lever (42) and the second output lever (44) with the drawing mechanism (4) and in that the clips (182, 184) are secured to each other.

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