Opening mechanism and jacquard loom equipped with the same

Abstract

The present application relates to an opening mechanism and a jacquard loom equipped with the opening mechanism. The opening mechanism comprises a housing, at least one movable hook which can be held by a selection device comprising at least one electromagnet and comprising a ferromagnetic core comprising a first pole face and a second pole face which are offset from each other along a longitudinal direction. The electromagnet further comprises a non-magnetic portion and a holding lever configured to hold the movable hook when the movable hook is in or close to its upper dead point position, the holding lever being mounted to pivot about a pivot axis between a position away from the electromagnet and a position in contact with the electromagnet. The non-magnetic portion of the electromagnet comprises a surface for guiding the pivoting of the holding lever about the pivot axis, the guiding surface cooperating with the holding lever in a direction radial to the pivot axis between the position away and the position in contact. The guiding surface is cylindrical with a circular base, centered on the pivot axis.

Description

Technical Field

[0001] The present invention relates to a shedding mechanism in a jacquard loom and a jacquard loom equipped with the mechanism. Background Art

[0002] In Jacquard looms, the shedding mechanism selectively raises the healds, each of which includes an eyelet through which the warp threads pass. Depending on the position of the hook attached to the upper end of each heald, the yarn passing through its eyelet is positioned above or below the weft yarn being moved by the loom. In practice, the shedding mechanism comprises a plurality of movable hooks, each with a nose adapted to engage a vertically reciprocating blade. Each movable hook is capable of interacting with a retaining member belonging to a selection device that is part of the shedding mechanism and is controlled by means of an electromagnet.

[0003] As shown in the figures of EP-A-1413657, the electromagnets can be mounted in a housing that defines a pivot axis for each retaining lever. Consequently, the relative position of the retaining lever and the electromagnet, and in particular the relative position of the retaining lever's attraction surface to the electromagnet's pole face, depends on the position of the electromagnet in the housing. Consequently, depending on manufacturing and positioning tolerances, this relative position can vary within the opening mechanism for different selection devices. This position can also change over time. Consequently, the value of the one or more air gaps formed between the retaining lever and the electromagnet's ferromagnetic core varies depending on the position of the electromagnet in the housing, which significantly affects the magnetic force exerted between the lever and the electromagnet when the electromagnet is activated.

[0004] Similar arrangements are known from EP-A-0823501, EP-A-0851048, EP-A-0899367, EP-A-1619279 and EP-A-1852531, which are generally satisfactory but give rise to similar problems with respect to the variation in the relative position of the retaining rod and the electromagnet.

[0005] The invention aims to improve the accuracy and reliability of the selection obtained by means of an opening mechanism in which the relative position of the retaining rod and the electromagnet is accurately and reliably determined, making it possible to precisely control the magnetic attraction between these elements and the current supplied to the electromagnet. Summary of the Invention

[0006] To this end, the invention relates to an opening mechanism on a jacquard loom, the mechanism comprising a housing extending along a longitudinal direction and at least one movable hook, a knife portion moving said movable hook in said housing along said longitudinal direction between a lower dead point position and an upper dead point position, said hook being retainable by a selection device when in or close to said upper dead point position, the selection device comprising at least one electromagnet attached and fixed in the housing and comprising a ferromagnetic core and a non-magnetic portion integral with the ferromagnetic core, the ferromagnetic core comprising a first pole face and a second pole face, the pole faces being offset from each other along the longitudinal direction. The selection device further comprises a retaining lever configured to retain the movable hook when the movable hook is in or close to its upper dead point position. The retaining lever is mounted to pivot about a swing axis between a position away from the electromagnet and a position in contact with the electromagnet and comprises a ferromagnetic armature that magnetically interacts with the first and second pole faces to control the angular position of the retaining lever about the swing axis. According to the invention, the non-magnetic portion of the electromagnet comprises a guide surface for guiding the pivoting of the retaining lever about the swing axis, the guide surface cooperating with the retaining lever in a direction radial to the swing axis between the position away and the position in contact. The guide surface is cylindrical with a circular base, centered on the swing axis.

[0007] With the invention, the guide surface of the retaining lever is formed on the electromagnet, not on the housing, which fact ensures an accurate and constant positioning of the retaining lever with respect to the pole faces of the electromagnet, with a likewise accurate and constant air gap. Therefore, the magnetic force required to retain the retaining lever in the position in contact with the electromagnet is the same for all selection devices of the opening mechanism, which is advantageous in terms of controlling the weaving method on the loom.

[0008] According to an advantageous but non-mandatory aspect of the invention, such an opening mechanism can incorporate one or more of the following features, in any technically admissible combination

[0009] - the guide surface is an outer peripheral surface of a guide shaft, the retaining lever guide shaft being pivotally mounted.

[0010] - the non-magnetic portion of the electromagnet further comprises a flange from which the guide surface extends, and wherein the space accommodating a portion of said retaining lever is delimited by said guide surface in a direction radial to said swing axis and by said flange in a direction parallel to said swing axis.

[0011] - the flange is arranged in the form of an annulus around one end of the guide shaft.

[0012] - the housing is composed of a housing half for accommodating the selection device and a cover, the housing half and the cover being superposed along a second direction of the housing perpendicular to the longitudinal direction, while the oscillation axis extends along the second direction of the housing, and the housing half or the cover forms a concave housing complementary to the shape of the guide shaft and an annular surface formed around the concave housing, wherein the free end of the guide shaft opposite the flange is engaged in the concave housing and pressed against the bottom of the hollow housing along the second direction of the housing, and wherein a portion of the retaining rod is arranged between the flange and the annular surface along the second direction of the housing.

[0013] The first pole face is part of a cylinder centered on the oscillation axis, while a portion of the armature of the retaining rod is inserted between the guide surface and the first pole face in a direction radial to the oscillation axis, and, between the contact position and the distant position of the retaining rod, the cooperation between the guide surface and the retaining rod ensures that there is no contact between the first pole face and the armature.

[0014] The first pole face extends on both sides of a transverse plane passing through the oscillation axis and perpendicular to the longitudinal direction, and wherein the ratio between the angular amplitude of the portion of the first pole face located on the same side as the second pole face relative to the transverse plane and the total angular amplitude of the first pole face is between 0.2 and 0.4, preferably equal to 0.33.

[0015] The armature of the retaining rod comprises an outer attractive surface facing the second pole face when the retaining rod is in the position in contact with the electromagnet, while the retaining rod comprises a non-magnetic body integral with the armature and comprising at least one abutment surface:

[0016] • adjacent to the outer attractive surface.

[0017] • projecting in the direction of the electromagnet relative to the outer attractive surface.

[0018] • distant from the electromagnet when the retaining rod is in the position distant from the electromagnet; and

[0019] • in contact with the electromagnet when the retaining rod is in the position in contact with the electromagnet,

[0020] while, simultaneously, the outer attractive surface is distant from the second pole face in the position of the retaining rod in contact with the electromagnet.

[0021] - the non-magnetic part of the electromagnet comprises a frame comprising the guide surface and made of a polymeric material overmolded on a ferromagnetic core.

[0022] - the electromagnet is fixed in the housing by mounting a centering pin into a centering groove along a direction of the housing perpendicular to the longitudinal direction.

[0023] - the non-magnetic part of the electromagnet comprises a frame comprising guide surfaces, the frame being formed before assembly with the ferromagnetic core, a quantity of polymeric material extending around the core and the frame to fix the electromagnet in the housing.

[0024] - the selection device comprises at least two retaining rods, which are arranged at the same longitudinal level in the housing, are located on either side of the electromagnet along a direction perpendicular to the longitudinal direction, and each interacts with one of the two lower pole faces and one of the two upper pole faces of the ferromagnetic core, the guide surfaces cooperating with the retaining rods being formed on parts of the electromagnet that are integral with one another.

[0025] - the flange is engaged in a recess provided on the housing and delimited by a surface complementary to the radially outer surface of the flange, the complementary surface being arranged opposite the flange along the longitudinal direction and below the flange in the operating configuration of the mechanism.

[0026] - the winding of the electromagnet is wound on the intermediate portion of the ferromagnetic core, between the first pole face and the second pole face, and in contact with at least one lateral face of the ferromagnetic core.

[0027] - the surface of the first longitudinal end of the retaining rod cooperates with the guide surface to pivot the rod between the position of distancing and the position of contact, the retaining rod extending generally downward from the first longitudinal end along the longitudinal direction in the operating configuration of the mechanism.

[0028] According to another aspect, the application relates to a pattern loom comprising an opening mechanism as described above.

[0029] Such a loom has the same advantages as the opening mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0030] The application will be better understood and other advantages thereof will become more clearly apparent from the following description, given by way of example only, of several embodiments thereof according to its principles, with reference to the appended drawings in which:

[0031] Figure 1 is a schematic view showing a pattern loom according to the application and incorporating the principles of an opening mechanism according to the application.

[0032] Figure 2 is a perspective view of the ferromagnetic core of an opening mechanism of a loom according to Figure 1 .

[0033] Figure 3 is a perspective view of an electromagnet after mounting of an insulating frame on the core of Figure 2 .

[0034] Figure 4 is a perspective view of an electromagnet according to Figure 3A larger scale cross section of plane IV.

[0035] Figure 5 is Figure 3 A perspective view of the electromagnet after installation of the protective overmold on the frame visible in FIG.

[0036] Figure 6 yes Figure 5 A larger scale cross section in plane VI of FIG.

[0037] Figure 7 Belongs to Figure 1 Perspective view of the holding rods of the shedding mechanism of a loom.

[0038] Figure 8 Is to keep the rod in Figure 7 Front view in the direction of arrow VIII.

[0039] Figure 9 yes Figure 6 and Figure 7 Side view of the middle retaining rod, with two partial cross sections AA and BB.

[0040] Figure 10 yes Figure 1 A perspective view of the housing of the opening mechanism, with an enlarged detailed view of the area of ​​the housing for accommodating the electromagnet and the corresponding part of the housing cover.

[0041] Figure 11 Partial front view of a housing equipped with a selection device consisting of an electromagnet and two retaining rods and two movable hooks.

[0042] Figure 12 yes Figure 11 detailed Figure X Larger scale view of II.

[0043] Figure 13 yes Figure 11 detailed Figure X Larger scale view of III.

[0044] Figure 14 is a larger scale cross section corresponding to Figure 11 Line XIV-XIV, in the Figure 1 A stack of housings of the shedding mechanisms of the looms.

[0045] Figure 15 is based on Figure 14 Partial cross section along line XV-XV.

[0046] Figure 16 is with Figure 5 A similar partial view of the electromagnet of the opening mechanism according to the second embodiment of the present invention is shown.

[0047] Figure 17 is with Figure 11 The lower left portion corresponds to a partial view of the opening mechanism according to the second embodiment of the present invention.

[0048] Figure 18 is with Figure 4 A similar cross section of an electromagnet belonging to an opening mechanism according to a third embodiment of the present invention.

[0049] Figure 19 is with Figure 3 A similar perspective view of an electromagnet belonging to an opening mechanism according to a fourth embodiment of the present invention.

[0050] Figure 20 is a partial perspective view of a housing of an opening mechanism according to a fourth embodiment of the present invention; and

[0051] Figure 21 yes Figure 20 A perspective view of a housing equipped with an electromagnet, the frame of which is shown in FIG. Figure 19 shown. DETAILED DESCRIPTION

[0052] exist Figure 1 In the jacquard loom M shown, the warp yarn sheet 1 comes from a warp beam 2. Each warp thread 1 passes through the eye 3a of a heald 3 designed to open the shed to allow the weft yarn to pass through, thereby forming the fabric T wound on a bobbin 4. Figure 1 Only two healds 3 and 3' are shown, with heald 3 in the upper position and heald 3' in the lower position. The lower end of each heald is connected to the fixed frame of the loom M by a tension spring 5, while its upper end is integral with a yoke 6.

[0053] An opening mechanism 7 associated with an electronic control unit 8 controlling it allows each yoke 6 to be lifted more or less against the return force exerted by the spring 5 .

[0054] As shown in the figure, only the yokes 6 associated with the healds 3 each have an end 6a integral with the housing 10 of the opening mechanism 7, the yoke passing through a lip nose 11 suspended on a thread 12, the ends of which are respectively integral with two movable hooks 13, which can be selectively lifted by a knife 14 driven by an alternating vertical swinging movement with opposite phases, as shown in FIG. Figure 1 As shown by arrow F1 in FIG. Other configurations of yokes, leads and lips and noses are also possible.

[0055] For the clarity of the drawings, Figure 1 Only some components of the opening mechanism 7 are shown.

[0056] The shedding mechanism 7 can also be called a "jacquard module" and comprises a stack of several integral housings, for example eight housings. In each unit housing a selection device comprising an electromagnet and two retaining rods is arranged. In addition, two hooks 13 are movable longitudinally in each unit housing, i.e. along the longest dimension of the housing 10, which is vertical in the installed configuration of the shedding mechanism 7 in the loom M. The two movable hooks are preferably integral with a thread, for example Figure 1 A thread 12 is shown, on which the lip 11 through which the yoke 6 passes is suspended.

[0057] Each electromagnet 100 of the opening mechanism 7 includes Figure 2 The ferromagnetic core 102 is shown separately, along with a frame 104 made of non-magnetic material, a winding 106 wound around the middle of the core 102, a housing 108, and electrical contacts 110. The electrical contacts 110 are intended to be connected to two cables (not shown) that connect the electromagnet 100 to the electronic control unit 8 and allow for selective powering of the electromagnet 100. The frame 104 and the housing 108 together form the non-magnetic part of the electromagnet 100. The winding 106 and the electrical contacts 110 also belong to the non-magnetic part of the electromagnet 100. The term "non-magnetic" means that the magnetic susceptibility is very low, so that the non-magnetic part cannot magnetically interact with the ferromagnetic part.

[0058] Figure 2 The longitudinal axis of the central electromagnet 100 oriented from top to bottom is marked as X100. Figure 4 The horizontal axis oriented from left to right of the electromagnet 100 is labeled Y100. The axis in the thickness or depth direction of the electromagnet 100 is labeled Z100, which is also the axis in the direction of the smallest dimension of the electromagnet 100. Axes X100, Y100, and Z100 together form a directly oriented orthogonal reference system. Figure 4 and Figure 6 Along Figure 3 The X100 direction of the central axis and Figure 5 Cross section in the opposite direction of the central axis X100.

[0059] The core 102 has a constant thickness e102 measured parallel to the axis Z100. The core 102 is generally I-shaped, having a longitudinal central stem 120 extending parallel to the axis X100 and two transverse branches 122 and 124 extending primarily parallel to the axis Y100. The longitudinal central stem 120 is the intermediate portion between the transverse branches 122 and 124.

[0060] The lateral ends of upper transverse branch 122 form two first pole faces S122 of electromagnet 100. These first pole faces are defined at the edge of core 102, are concave, and are in the form of a cylindrical cross-section, the circular cross-section of which is centered on axis A122, which is perpendicular to the main plane of core 102. Axis A122 is parallel to axis Z100. On the other hand, the lateral ends of lower transverse branch 124 form two second pole faces S124 of electromagnet 100. These second pole faces S124 are formed at the edge of core 102, are flat, and are parallel to axes X100 and Z100.

[0061] The first pole surface S122 deviates from the second pole surface S124 along the axis X line 100 .

[0062] In the middle portion of the lower branch 124, a centering notch 126 is provided on its edge opposite the central rod 120. The centering notch is situated between the second pole faces S124 and equidistant therefrom along the axis Y100.

[0063] The frame 104 is overmolded around the core 102, which it partially encloses. "Overmolding" means that the material of the frame 104 is injected into a mold in which the core 102 has previously been placed, so that the material of the frame 104 surrounds the core 102 and, after curing, is attached to the core. The frame 104 is made of a non-magnetic material, such as a thermoplastic polymer type, and may be reinforced with fibers. Thus, the frame 104 is integral with the core 102 and has a fixed position relative to the core 102.

[0064] like Figure 3 As shown, the frame surrounds the upper transverse branch 122 of the core 102, flush with the first pole face S122. The frame 104 extends on either side of the upper transverse branch 122 via flanges 142 and guide shafts 144 centered on respective axes A144. The two flanges 142 and the two shafts 144 are part of the frame 104, integral with the remainder of the frame 104, particularly the portion of the frame surrounding the upper transverse branch 122. In other words, each guide shaft 144 is non-detachably connected to the frame 104, particularly to the adjacent flange 142. Axis A144 is parallel to axis Z100. Each axis A144 coincides with the central axis A122 of the adjacent first pole face S122. Thus, each axis A144 is at the same longitudinal height as the adjacent first pole face S122. Each guide shaft 144 has a cylindrical outer shape with a circular cross-section, and its outer circumferential surface is designated S144.

[0065] Frame 104 further defines a centering pin 146 extending relative to the middle portion of upper branch 122 and centered about an axis A146 parallel to axis A144 and axis Z100. Centering pin 146 is also cylindrical with a circular cross-section. Unlike guide shaft 144, which is solid, it is hollow.

[0066] The frame 104 comprises two strips 148 that cover the edges 120A and 120B of the central rod 120 perpendicular to the axis Y100 , but do not cover the sides 120C and 120D of this central rod perpendicular to the axis Z100 .

[0067] The frame 104 also includes feet 150 , which cover the connection area between the rod 120 and the branches 124 , and slats 152 .

[0068] The lower transverse branch 124 projects from the frame 104 along the longitudinal direction of the ferromagnetic core 102 parallel to the axis X100 and along the transverse direction of the ferromagnetic core parallel to the axis Y100. In particular, the frame 104 does not extend at the level of the second pole face S124.

[0069] A flange 142 is located near one end of each guide shaft 144 and extends annularly around it, connecting the shaft to the rest of the frame 104. The flange 142 is formed on a non-magnetic portion of the electromagnet 100. The annular surface of each flange 142, perpendicular to the axis Z100 and facing the side of the guide shaft 144 that the flange surrounds, is designated S142. This surface S142 is perpendicular to the axis A144 of the adjacent guide shaft 144 and extends annularly around the guide shaft, i.e., over 360°. Surfaces S142 and S144 are adjacent and perpendicular.

[0070] The peripheral surface of flange 142 is designated S'142. This surface is a portion of a cylinder having a circular base centered about axis A144 of adjacent guide shaft 144. Thus, peripheral surface S'142 of flange 142 is coaxial with outer peripheral surface S144 of adjacent guide shaft 144.

[0071] The surface S142 of the flange 142, the outer peripheral surface S144 of the adjacent guide shaft 144, and the first pole surface S122 opposite thereto define a space for receiving the guide shaft 144. Figures 7 to 9 2. The space V1 of the portion of the retaining rod 200 shown separately in FIG. More specifically, the surface S144 radially defines the space V1 in a direction converging toward the axis A144. The first pole surface S122 radially defines the space V1 in a direction diverging from the axis A144. The surface S142 axially defines the space V1 in a direction from the free end 144E of the shaft 144 toward the adjacent flange 142 (i.e., here, opposite the direction of the axis Z100).

[0072] The space V1 defined by the electromagnet 100 may be referred to as a partial receiving housing for the holding rod 200 .

[0073] The fact that each guide shaft 144 is formed by a portion of the electromagnet 100, in particular integral with the frame 104, makes it possible to reduce the positioning tolerances of this guide shaft relative to the ferromagnetic core 102, more precisely, the positioning tolerances between the surface S144 and the first pole face S122. This contributes to the precision of the geometrical definition of the space V1 and the precision of the guidance of the retaining rod 200 relative to the ferromagnetic core 102.

[0074] The winding 106 is manufactured by winding a wire in the form of a coil around the central rod 120 of the ferromagnetic core 102 equipped with a bar 148. This winding is manufactured after the frame 104 has been overmolded onto the ferromagnetic core 102, so that the winding 106 is in contact with the sides 120C and 120D of the central rod 120, but is separated from the edges 120A and 120B by the bar 148. Each end of the wire constituting the winding 106 is connected to one of the two electrical contacts 110. The frame 104 then provides electrical insulation between the two electrical contacts 110, as well as between the core 102 and the two electrical contacts 110, including at their connection to the winding 106. Once the winding 106 is in place on the central rod 120 and connected to the electrical contacts 110, the covering 108 is applied to the components 102, 104 and 106 by low-pressure overmolding and forms a protective layer for the winding 106 in particular. From Figure 3 and Figure 5 The geometry of the cover 108 can be deduced from the comparison of the . The cover 108, the windings 106 and the electrical contacts are then integrated with the core 102.

[0075] An orthogonal reference system X200, Y200, Z200 is defined relative to each retaining rod 200, of which the axis X200 is parallel to the largest dimension of the rod 200, i.e., it forms the longitudinal axis of the rod, the transverse axis Y200 is parallel to the width of the rod, and the depth axis Z200 is parallel to the thickness of the rod. When the retaining rod 200 is mounted in the opening mechanism 7, the axis X200 is oriented downwards.

[0076] The rod 200 comprises an armature 202 made of a ferromagnetic material, for example pure iron, and a non-magnetic body 204 integral with the armature 202. The armature 202 magnetically interacts with the first pole face S122 and the second pole face S124, as will be apparent from the disclosure below. The armature 202 extends parallel to the axis X200 between a first longitudinal end 206 and a second longitudinal end 208. The first longitudinal end 206 defines a first housing 210 which, along its thickness, passes from one side to the other side thereof and has a circular cross-section centred on an axis A210 parallel to the axis Z200. The peripheral surface of the housing 210 is denoted S210, which is the inner surface of the first end 206. The outer peripheral surface of the end 206 is denoted S206. A portion S206A of this outer peripheral surface S206 has a circular base centred on the axis A210 and this portion S206A itself forms the outer surface of the first longitudinal end 206.

[0077] The second longitudinal end 208 of the armature 202 defines a second housing 212 which, along its thickness, also passes through the armature 202 and in which the non-magnetic body 204 is anchored by means of a rod 214 integral with the rest of the non-magnetic body 204 and passing from one side to the other side of the housing 212.

[0078] In practice, the non-magnetic body 204 is formed from a synthetic material, in particular a plastic material, for example of the thermoplastic polymer type, possibly reinforced with fibres, which is overmoulded onto the metal armature 202 by filling the second housing 212, thus forming the rod 214. The non-magnetic body 204 thus has a fixed position relative to the armature 202 and is movable with the armature 202. The non-magnetic body 204 surrounds the end 208 of the armature 202 and extends in the direction of the longitudinal axis X200, i.e. away from the first longitudinal end 206.

[0079] The non-magnetic body 204 forms, on its entire periphery, a selection nose 216, a guide ramp 218 and a pin 220 surrounded by a collar 222. The surface S216 of the selection nose facing the armature 202 and the first end 206 allows the movable hook 13 to be held in its upper dead point position or in the vicinity thereof by engaging a hole in the movable hook.

[0080] Along a transverse direction of the non-magnetic body 204 parallel to the axis Y200, the nose 216 and the ramp 218 are located on one side of the body, while the pin 220 and the flange 222 are located on the other side of the body. The surface portion S206A is located on the same side of the holding rod 200 as the pin 220.

[0081] The body 204 also comprises an abutment surface S204 intended to selectively come into contact with the electromagnet 100 depending on the position of the holding rod. The selection nose 216, the guide ramp 218 and the pin 220 are integral with the abutment surface S204.

[0082] Along the longitudinal direction of the rod 200, that is, along the axis X200, the abutment surface S204 is adjacent to an outer attraction surface S208 formed by the second end 208 of the armature 202, more specifically, an outer attraction surface S208 formed by a slice of a portion 208A of the second end that is not covered by the non-magnetic body 204. The abutment surface S204 is adjacent to the outer attraction surface S208 because the abutment surface S204 and the outer attraction surface S208 share a common boundary.

[0083] Surfaces S206A and S208 have electrical continuity as the armature 202 extends seamlessly between these surfaces. This stems, among other things, from the fact that, in this example, the armature 202 is monolithic.

[0084] The portion 208A of the end 208 that defines the outer attraction surface S208 is the portion of the armature 202 that is farthest from the first end 206 .

[0085] The armature 202 extends in the direction of the axis X200 from the first end 206 to the junction of the outer attraction surface S208 and the abutment surface S204. In other words, the armature 202 does not extend within the non-magnetic body 204 for a significant length beyond the portion 208A.

[0086] The abutment surface S204 is generally flat and parallel to the axes X200 and Z200 and is provided with transverse grooves 224 parallel to the axis Z200, juxtaposed along the longitudinal direction of the rod parallel to the axis X200. These grooves 224 have the effect that the surface S204 is not smooth but notched, since it is formed by the juxtaposition of strips of material separated by the grooves 224.

[0087] The deflectors are formed from the non-magnetic body 204 and are integral with the rest of the body. A first deflector 226 extends longitudinally around the non-magnetic body 204 at the same height as the abutment surface S204, but opposite that surface along the transverse axis Y200. Two other deflectors 228 and 230 are formed from the non-magnetic body 204 on the same side as the abutment surface S204, but at different heights along the longitudinal axis X200, located on either side of that surface. More specifically, deflector 228 is located along the axis X200 between the first longitudinal end 206 and the abutment surface S204, while the second deflector 230 is located along the axis X200 between the abutment surface S204 and the pin 220. A joint strip 232 connects the deflectors 228 and 230 along the longitudinal direction of the retaining rod 200. These joint strips 232 are located on either side of the surfaces S204 and S208 along the axis Z200. The deflector 226 is connected to the engagement strip 232 .

[0088] Thus, the deflectors 226, 228, and 230 are continuous with one another. Specifically, the deflectors 228 and 230 and the engagement strip 232 form a continuous edge around the surfaces S204 and S208, as shown in FIG. Figure 7 The deflector 226 and the selection nose 216 are located on the same side of the non-magnetic body 204, while the pair of deflectors 228 and 230 are located on the same side as the abutment surface S204 and the outer attraction surface S208. In addition, the deflector 226 is located longitudinally (i.e., along the axis X200) between the deflectors 228 and 230.

[0089] The opening mechanism 7 further comprises one or more integral housings 300 as part of the housing 10. The number of housings 300 as part of the opening mechanism 7 depends on the number of electromagnets 100. In practice, as many integral housings 300 as electromagnets 100 are provided.

[0090] Associated with each integral shell 300 are orthogonal reference frames X300, Y300, Z300, which are defined by the longitudinal axis X300, the transverse axis Y300, and the depth axis Z300 of the integral shell 300, respectively.

[0091] Each integral housing 300 includes Figure 10 The housing half 302 is visible in its entirety in the upper part and delimits a portion 304 for receiving a selection device 400 formed by an electromagnet 100 and two associated retaining rods 200, as well as a guide portion 306 for two movable hooks 13 intended to be selected by means of the selection device.

[0092] The integral housing 300 shown in the figure, whose electromagnet 100 includes two pairs of first pole faces and second pole faces, and two retaining rods 200 arranged on both sides of the electromagnet along the axis Y100, is used in a two-position jacquard type shedding mechanism for weaving so-called "flat" fabrics.

[0093] exist Figure 10 The lower right portion of FIG. 1 shows the receiving portion 304 on a larger scale, while Figure 10 The lower left portion of FIG. 3 shows a portion of a cover 308 corresponding to portion 304 . The housing half 302 and the cover 308 together form the integral housing 300 .

[0094] The bottom 303 of the housing half 302, parallel to the axes X300 and Y300, presents a longitudinal slot 310 for guiding the movement of the blade 504 belonging to the movable hook 13. This bottom is also pierced with a hole 312 for the passage of a rod or a screw for joining the superimposed multiple housings 300 belonging to the integral housing of the opening mechanism 7, these housings 300 together forming all or part of the housing 10.

[0095] In this portion 304, the overall housing 300 defines a recess 314 which passes through the bottom 303 and delimits a space for partially containing the electromagnet 100, as well as two areas 316 for containing the two retaining rods 200 associated with the electromagnet 100.

[0096] The bottom 303 of the housing half 302 is traversed from one side to the other along the direction of the axis Z300 by a circular centring housing 320, intended to accommodate the centring pin 146 in the mounted configuration of the electromagnet 100 in the overall housing 300. This centring housing has a geometry complementary to that of the centring pin 146.

[0097] A centring pin 322 projects from the bottom 303 parallel to the axis Z300, between the recess 314 and the guiding portion 306 along the axis X300. This centring pin 322 is located opposite the centring housing 320 with respect to the recess 314. This centring pin is intended to engage in the centring notch 126 of the ferromagnetic core 102 in the mounted configuration of the electromagnet 100 in the overall housing 300.

[0098] The overall housing 300 also forms a baffle 324 in each area 316 for receiving a retaining rod 200.

[0099] On both sides of the centring housing 320 along the transverse Y300, the overall housing 300 defines a housing 326 in the form of a portion of a cylinder with a circular cross-section for accommodating the flange 142 of the electromagnet 100. Each housing 326 is defined by an annular surface 328 and a rib 330, the inner surface of which is cylindrical with a circular cross-section and is complementary to the outer peripheral surface S'142 of the flange 142 of the electromagnet 100.

[0100] The cover 308, the surface of which is visible in Figure 10 , is a cover generally facing the bottom 303 of the housing half 302, which defines holes 332 for fastening pins or screws to pass through, these holes 332 being aligned with the holes 312 in the mounted configuration of the cover 308 on the housing half 302. The cover 308 also defines a centring recess 334 which is aligned with the centring recess 320 in the mounted configuration of the cover 308 on the housing half 302. Alternatively, the cover 308 can not comprise the centring recess 334. The cover 308 further defines two recessed housings 336, each formed by an annular plane 338 and a rib 339. These recessed housings 336 are respectively aligned with one of the housings 326 in the mounted configuration of the cover 308 on the housing half 302.

[0101] The elements 302 and 308 are made by injection moulding of an electrically insulating polymeric material, which is optionally reinforced with fibres to improve its mechanical properties. The elements 302 and 308 are non-magnetic.

[0102] In the mounting configuration of the retaining lever 200 on the electromagnet 100, the first longitudinal end 206 of the metal armature 202 is mounted around one of the guide shafts 144. To this end, the axes A144 and A210 coincide, the surfaces S144 and S210 are radially oriented toward the axis A144, and the respective dimensions of the surfaces S144 and S210 are selected to allow each retaining lever 200 to pivot about the swing axis X144 while effectively guiding this pivoting movement.

[0103] In the mounted configuration of the selection device 400 , the orthogonal reference frames X100 , Y100 , Z100 and each of the orthogonal reference frames X200 , Y200 , Z200 substantially coincide, neglecting any oscillations of the axis A144 of the guide shaft about which the retaining rod 200 is mounted.

[0104] In the installed configuration of the selection device 400 in the integral housing 300, each retaining rod 200 extends downwardly from its first end 206 substantially along the longitudinal direction of the integral housing 300 (i.e., parallel to the axis X300). In this configuration, the orthogonal reference frames X100, Y100, Z100, X200, Y200, Z200 and X300, Y300, Z300 substantially coincide.

[0105] exist Figure 11 In the mounting configuration shown below, the outer attraction surface S208 of each retaining rod 200 is oriented toward one of the second pole faces S124 of the electromagnet 100 parallel to the axis Y100.

[0106] Each retaining rod 200 moves about the axis A144 of the guide shaft 144 on which the first longitudinal end 206 of its armature 202 is mounted, and between a position in contact with the electromagnet (in this example, in contact with the lower branch 124 of the ferromagnetic core 102) and a position remote from the electromagnet, wherein there is an empty space E of non-zero dimensions along the axes X100, Y100, and Z100 between the electromagnet (in this example, the lower branch 124) and the rod 200. In particular, in the remote position of the retaining rod 200 relative to the electromagnet 100, the depth of the empty space E measured along the Y axis is non-zero. In practice, the terms "remote" and "in contact therewith" used to define the position of the retaining rod relative to the electromagnet refer to its nature of being remote from or in contact with the abutment surface S204 of the electromagnet. Figure 11 The holding rod 200 shown at the bottom is in contact with the electromagnet, and Figure 11 The rod 200 shown at the top is located away from the electromagnet.

[0107] In the configuration of the rod 200 in contact with the electromagnet 100, the surface S204 is in contact with the second pole surface S124 to limit Figure 11The pivotal movement of the lever 200 shown in the lower center is in triangular directions around the axis A144 of the guide shaft 144, on which the lever 200 is pivotally mounted.

[0108] In this contact position, the outer attraction surface S208 is not in contact with the lower pole face 124, but rather is spaced apart from it due to a non-zero lateral gap J1 between surface S208 and the second pole face S124. The dimensions of gap J1 are measured parallel to the axes Y100, Y200, and Y300. The presence of a non-zero gap J1 over the entire length of surface S208 along axis X100 and the entire thickness of surface S208 along axes Z100, Z200, and Z300 indicates an air gap between the second pole face S124 and surface S208. This is due to the fact that, on the retaining rod 200, the abutment surface S204 protrudes relative to the outer attraction surface S208 in the direction of the electromagnet 100. In other words, in the installation configuration of the retaining rod 200, the abutment surface S204 protrudes laterally relative to the outer attraction surface S208 in a direction parallel to the Y200 axis and facing the electromagnet, and when the rod 200 pivots from a position away from the electromagnet to a position where it contacts the electromagnet, the abutment surface S204 contacts the second pole face S124, so that the outer attraction surface S208 maintains a distance from the second pole face S124.

[0109] The surface S208 is the outer attractive surface through which the magnetic attraction force between the ferromagnetic core 102 and the metallic armature 202 is exerted when the rod 200 is in its contact position with the electromagnet 100 and when the electromagnet is energized.

[0110] exist Figure 9 It is noted that the armature 202, and in particular the portion 208A of the end 208, does not extend longitudinally across the entire abutment surface S204.

[0111] The outer attraction surface S208 is arranged longitudinally relative to the retaining rod 200, i.e., along the axis X200, between the abutment surface S204 and the axis A210. The length l8 of the outer attraction surface S208 is greater than the length l4 of the abutment surface S204, which, in the contact position of the retaining rod 200, faces the second pole face S124 and forms the contact area between the surface S204 and the second pole face S124. The lengths l4 and l8 are measured parallel to the axis X200. Figures 1 to 15In the illustrated embodiment, the entire abutment surface S204 faces the second pole surface S124 in the contact position of the retaining rod 200. However, it is conceivable that only a portion of the abutment surface S204 contacts or faces the second pole surface S124. In this case, the length l4 of the portion of the abutment surface S204 in contact with the second pole surface S124 also forms the contact area between the abutment surface S204 and the second pole surface S124, which is selected to be less than the length l8.

[0112] Note that the length l48 is measured parallel to the axis X200, and the metal armature 202 of the retaining rod 200 extends from the end 206 beyond the length parallel to the axis X200. Figure 8 The line L1 defining the boundary between the surfaces S208 and S204 in the plane of the plane. This line L1 is perpendicular to Figure 12 plane, and in Figure 8 The surface of the retaining rod 200 shown shows the connection zone Z1 between the components 202 and 204. Therefore, the length l48 corresponds to the overlap between the second longitudinal end 208 and the abutment surface S204. The ratio l48 / l4 is less than 0.2. In other words, the abutment surface S204 overlaps the armature 202 by less than one-fifth of the useful portion l4 of the abutment surface S204, which serves to secure the armature to the electromagnet. This results in the portion of the non-magnetic body 204 that constitutes the abutment surface S204, the selection nose 216, the guide ramp 218, and the pin 220 forming the lower end of the retaining rod 200, which is essentially free of metallic armature below the outer attraction surface.

[0113] In the mounted configuration of the selection device 200 in the integral housing 300, the deflectors 226, 228, and 230 engage in the receiving areas Z226, Z228, and Z230 formed by the baffle 324. Thus, the cooperation of the deflectors and the baffle isolates certain internal portions of the integral housing 300 equipped with the selection device 400 from the guide portion 306, thereby protecting these portions from the accumulation of dust, mud, or grease.

[0114] In the mounting configuration of the selection device 400 in the overall housing 300, the compression coil springs 340 are inserted between the central rib 342 of the housing 300 and the non-magnetic body 204 of the retaining rod 200. By default, each spring 340 has the function of pushing the retaining rod 200 back to a position away from the electromagnet 100. On one side of this non-magnetic body, the pin 220 engages inside the spring 340 and enables the spring to be centered, while the loop portion 222 enables the terminal coil of the spring to be housed around the support pin 220. When the loop portion 222 is wrapped around the pin 220 over the entire periphery of the pin 220, the end coil of the spring 340 must rest against this loop portion 222 without risk of this end coil sliding on the side of the pin 220, which guarantees the repeatability of the spring 340's resilience.

[0115] Each movable hook 13 comprises a main body 502 made of plastic material and a flexible blade 504 mounted on the main body 502. The flexible blade, which is preferably metallic, is intended to slide against the guiding ramp 218 of the retaining rod 200 and comprises an opening 508, which is visible in dotted line in Figure 11 and which is known per se, into which the selection nose 216 of the retaining rod 200 can engage. Here, the features of the movable hook described in EP-A-1852531 or EP-A-1413657 can be used.

[0116] In the lower part, each main body 502 is overmolded onto the end of the thread 12 of the support lip nose 11. Each main body 502 defines a support bracket 506 on the blade portion 14. To this end, each support bracket 506 protrudes transversely from the overall housing 300, in which the movable hook 13 is placed in a form-fitting manner on the upper surface of the blade portion.

[0117] In the mounting configuration of the selection device 400 in the overall housing 300, the compression coil springs 340 are inserted between the central rib 342 of the housing 300 and the non-magnetic body 204 of the retaining rod 200. By default, each spring 340 has the function of pushing the retaining rod 200 back to a position away from the electromagnet 100. On one side of this non-magnetic body, the pin 220 engages inside the spring 340 and enables the spring to be centered, while the loop portion 222 enables the terminal coil of the spring to be housed around the support pin 220. When the loop portion 222 is wrapped around the pin 220 over the entire periphery of the pin 220, the end coil of the spring 340 must rest against this loop portion 222 without risk of this end coil sliding on the side of the pin 220, which guarantees the repeatability of the spring 340's resilience. Figures 11 to 15 In the mounting configuration of the selection device 400 in the overall housing 300, the compression coil springs 340 are inserted between the central rib 342 of the housing 300 and the non-magnetic body 204 of the retaining rod 200. By default, each spring 340 has the function of pushing the retaining rod 200 back to a position away from the electromagnet 100. On one side of this non-magnetic body, the pin 220 engages inside the spring 340 and enables the spring to be centered, while the loop portion 222 enables the terminal coil of the spring to be housed around the support pin 220. When the loop portion 222 is wrapped around the pin 220 over the entire periphery of the pin 220, the end coil of the spring 340 must rest against this loop portion 222 without risk of this end coil sliding on the side of the pin 220, which guarantees the repeatability of the spring 340's resilience. Figure 13 As can be seen more particularly in

[0118] P144 is a transversal plane, parallel on one hand to the axes Y100, Y200 and Y300, and on the other hand to the axes Z100, Z200 and Z300, and perpendicular to the axes X100, X200 and X300, and containing the axes A122, A144 and A210.

[0119] The air gap defined by the radial gap J2 extends around the axis A122 over an entire angular sector at the apex a. A first portion of this entire angular sector is located below the transversal plane P144, on one side of this plane with respect to the second pole face S124, and has an angle a1 at the apex a1. A second portion of this entire angular sector is located above the transversal plane P144, i.e. opposite the second pole face S124, and has an angle a2 at the apex a2. The sum of the angles a1 and a2 is equal to the angle a. The angles a, a1 and a2 represent the angular size of the entire angular sector and of the first and second portions thereof, respectively. In other words, each first pole face S122 of the electromagnet 100 extends on both sides of the transversal plane P144 and comprises a first portion S122A located on the same side of this plane as the second pole face S124 and having an angular amplitude a1, and a second portion S122B located on the opposite side of this plane as the second pole face S124 and having an angular amplitude a2.

[0120] The ratio a1 / a is between 0.2 and 0.4, preferably equal to 0.33. In this preferred case, the ratio a1 / a2 is 0.5.

[0121] The good geometrical precision obtained at the air gap defined between the first pole face S122 and the surface portion S206A allows to optimize the dimensions of these surfaces. In particular, the ratio between the diameter of the first pole face S122 and the diameter of the surface S144 can be chosen to be greater than 1.4, preferably of the order of 1.5. This good precision also allows the first pole face S122 and the second pole face S124 to be spaced apart along a longitudinal direction parallel to the axis X100 or to the axis X300, without affecting the longitudinal dimensions of the electromagnet. This results in a relatively small amplitude of the angular pivoting movement of the holding rod 200 around the oscillation axis A144 between the far position and the contact position, to the extent that the air gap at the second pole face S124 has a width measured along the axis Y100, Y200, Y300 which varies little along the length of the outer attractive surface S208. This good precision further allows to reduce the outer diameter of the guide shaft 144, and thus the outer dimensions of the first longitudinal end 206, thereby reducing the metal losses during the manufacture of the metal armature 202.

[0122] During the manufacturing of the opening mechanism 7, the frame 104 is overmoulded onto the ferromagnetic core 102, then the winding 106 is mounted, the contacts 110 and the connecting wires between these contacts and the winding 106 are mounted, then the cover 108 is overmoulded. The electromagnet 100 thus manufactured, with its guide shaft 144, is inserted and fixed in the housing half 302 of the monolithic housing 300. The electromagnet 100 is inserted in the recess 314 along a direction parallel to the axis Z300 by inserting the centring pin 146 in the centring recess 320 of the monolithic housing 300. The centring pin 146 is located between the two first pole faces S122 and at an equal distance therefrom, by its mounting in the bottom 303 of the housing half 302 of the monolithic housing 300, allowing to ensure the positioning of the electromagnet 100 in the monolithic housing 300 respectively along a longitudinal direction parallel to the axis X300 and a transverse direction parallel to the axis Y300.

[0123] Furthermore, the centring recess 126 of the ferromagnetic core 102 is positioned without clearance in the transverse direction parallel to the axis Y300 around the complementary shaped centring pin 322 located on the housing half 302.

[0124] Then, the winding 106 of the electromagnet 100 is aligned with the recess 314 provided through the housing bottom parallel to the axis Z100.

[0125] Then, the frame 104 of the electromagnet 100 is supported on two support surfaces of the bottom 303 of the housing half 302, one arranged between the second pole faces S124 and the other arranged between the first pole faces S122.

[0126] The outer peripheral surface S'142 of the flange 142 is a radially outer surface in a cylindrical portion centred on the shaft 144 which is subsequently coincident with the axis A122. During the mounting of the electromagnet 100 in the monolithic housing 300, each flange 142 of the electromagnet 100 is engaged in the housing 326 of the monolithic housing 300 as shown in Figure 14 and 15 The radially outer surface S'142 of the flange 142 then faces the corresponding rib 330 in the plane of Figure 15 along a longitudinal direction parallel to the vertically downward axis X100, X200 and X300. Thus, a portion of the rib 330 is arranged opposite the surface S'142 along the longitudinal direction. In the plane of Figure 15 a reduced longitudinal gap J3 is defined between the outer peripheral surface S'142 and the rib 330. Thus, when the electromagnet 100 is placed in the monolithic housing 300, this gap J3 is vertical and in practice has a non-zero width to prevent the placement from generating an out-of-equilibrium situation. The width of the gap J3 is measured parallel to the axis X300. The width of the gap J3 is less than or equal to 0.5 mm.

[0127] After the electromagnet 100 is installed in the housing half 302 and in the operating configuration of the mechanism 7, the oscillation axis A144 is fixed with respect to the housing half 302 and the electromagnet 100. The free end 144E of the guide shaft 144 extends from the bottom 303 of the housing half 302. In other words, the two guide shafts 144 extend with their axis A144 parallel to the axis Z300 and perpendicular to the bottom 303 of the housing half.

[0128] Then, the retaining bars 200 are positioned around the guide shafts 144 of the frame 104, the first longitudinal end 206 of each retaining bar 200 being around the guide shaft 144. To this end, the axis A210 of each retaining bar 200 is aligned with the axes A122 and A144, then the first longitudinal end 206 of the armature 202 is partially engaged in the space VI by an axial translation parallel to the axes A122, A144 and A210, until it abuts against the surface S142 of one of the flanges 142. This amounts to hooking the retaining bar to the electromagnet in the monolithic housing. The orientation of the retaining bar is chosen so that a portion S206A of the outer surface S206 of each first longitudinal end 206 then faces the first pole face S122. On the other hand, thanks to this arrangement, each outer attractive surface S208 faces the second pole face S124 of the electromagnet 100 along a transverse direction parallel to the axes Y100, Y200 and Y300.

[0129] Since the first pole face S122 and the second pole face S124 are offset and spaced along the longitudinal direction, the longitudinal portion of the metal armature 202 of each retaining bar 200 neither faces the first pole face S122 nor the second pole face S124, but is longitudinally located at the height of the central bar 120 of the core 102 and of the winding 106.

[0130] When the retaining bars 200 are installed in the monolithic housing 300 equipped with electromagnets, during the axial translation described above, the deflectors 226, 228 and 230 of the non-magnetic body 204 are engaged in the zones Z226, Z228 and Z230 defined by the baffles 324.

[0131] After the two retaining bars 200 are installed on the electromagnet 100, these retaining bars are connected to the rest of the selection device 400 and, since the electromagnet 100 is fixed in the monolithic housing 300, each retaining bar is rotatable about the axis A144 which is fixed with respect to the monolithic housing 300.

[0132] Thus, the outer radial surface S144 of the guide shaft 144 forms a cylindrical guide surface that cooperates with the retaining rod 200, more specifically, with the surface S210 of the housing 210, during pivotal movement about its swing axis A144, and reduces clearance. Reduced clearance refers to a radial clearance at the swing axis A144 that is strictly smaller than the clearance J2 to ensure a non-zero air gap between the surface S206 and the adjacent first pole face S122, thereby eliminating contact between the armature 202 of the rod 200 and the first pole face S122, both in the remote position and in contact with the retaining rod. The guide surface S144 is formed on a non-magnetic portion of the electromagnet. Each guide shaft 144 forms an attachment point for the rod 200 to the housing 300, which is fixed relative to the electromagnet 100.

[0133] The cooperation of the deflectors 226 and 228 with the zones Z226 and Z228 defined by the baffle 324 isolates the zone of the housing containing the first longitudinal end 206 of the armature 202 of each lever and the relative guide shaft 144, this zone being dedicated to the articulation of the lever 200 with the electromagnet 100. This makes it possible to maintain the lubrication of the pivoting link made between the surfaces S144 and S210, which can be lubricated.

[0134] The cooperation of the deflectors 228 and 230 with the zones Z228 and Z230 defined by the baffle 324 also makes it possible to isolate the attraction zone defined between the second pole face S124, on the one hand, and the outer attraction surface S208 and the abutment surface S204, on the other hand. This keeps this attraction zone free of grease and dust, ensuring a satisfactory air gap between the second pole face S124 and the outer attraction surface S208 when the retaining rod 200 is in the position in which it is in contact with the electromagnet.

[0135] The two retaining rods 200 can then be moved about their respective guide shafts 144. Figure 11 The top and bottom of the hook 13 are shown to swing between the away and contact positions, respectively. In a manner known per se, this allows the movable hook 13 to be selectively held in place based on the command of the electromagnet 100 by the electrical contact 110.

[0136] Then, the movable hook 13 and the thread 12 can be positioned in the guide portion 306 of the housing half 302. Alternatively, the movable hook 13 and the thread 12 are placed in the housing half before the elements 100 and 200.

[0137] After the retaining rod 200 is placed on the electromagnet 100 (which itself is located in the integral housing 300), the free end 144E of the guide shaft 144 protrudes from the retaining rod 200 in a direction parallel to the axes Z100, Z200, and Z300. The housing half 302 can then be covered with the cover 308 by aligning the hole 332 with the hole 312 and aligning the housing 336 with the free end 144E of the guide shaft 144, with the housing half 302 and the cover 308 being superimposed along the axis Z300. Connecting rods or screws are then placed in the holes 312 and 332.

[0138] It is also possible to stack the housing halves 302 , each equipped with a selection device 400 , with the bottom 303 of one housing half serving as a cover for the adjacent housing half and with the cover 308 being used only for the last housing half 302 . Figure 14 and Figure 15 This configuration is partially shown. In this case, the holes 312 of the housing halves 302 are superimposed and then connecting rods or screws are placed in these holes.

[0139] Consider the electromagnet 100 installed in the first housing half 302, which is part of the first integral housing 300. In this case, the free end 144E of the guide shaft 144 of the electromagnet engages a correspondingly shaped housing 344 provided on the bottom surface 303 of the second, adjacent housing half 302. This housing covers the first housing half 302 by stacking the two housing halves 302 along axis Z300. Housing 344 replaces housing 336 of cover 308. The first integral housing is formed by the bottom 303 of the first and second housing halves. The same applies to the other integral housings, except that the last housing is covered by cover 308. A recessed housing 344 is arranged on the side of the bottom 303 of the second housing half 302 opposite the electromagnet 100 contained therein. The bottom 346 of the recessed housing 344 of the second housing half contacts the free end 144E of the guide shaft 144 in a direction parallel to axis Z300. Furthermore, the cylindrical wall 348 defining the housing 344 is substantially complementary to the outer peripheral surface S144 of the guide shafts 144 , thereby centering each guide shaft in the second housing half 302 of the second integral housing 300 .

[0140] Figure 14 and Figure 15 It is shown that the bottom of the first housing half of the unit housing stack is not provided with a female housing 344, which is unnecessary.

[0141] On the other hand, the flange 142 of the electromagnet housed in the first half-shell is faced by the flat annular surface 338 of the concave half-shell 344 formed by the bottom 303 of the second half-shell 302. The first end 206 of the armature 202 is located between the surfaces S142 and 338 facing each other along a direction parallel to the axis Z300. In other words, the surface 338 acts as a lid of the space VI which partially contains the armature 202.

[0142] If the lid 308 is used, it is the flat annular surface 338 of the concave half-shell 336 which closes the space VI.

[0143] In the stacked configuration shown in Figure 14 and 15 , the half-shells 300 are centred with respect to each other in the longitudinal and transverse directions parallel to the axes X300 and Y300 and in contact with each other in the direction of the axis Z300.

[0144] In operation, each electromagnet 100 selectively controls, by means of the two retaining rods 200 associated therewith, the retention or release of either of the two movable hooks 13 arranged on the two sides of the electromagnet in the same overall half-shell 300. In Figure 11 , the two movable hooks 13 are shown near the dead points of their trajectories. By inserting the selection nose 216 of the retaining rod in the hole 508 of the blade 504 of the movable hook, in Figure 11 , the movable hook 13 visible in the upper part is hooked on the corresponding retaining rod 200, this being possible because the retaining rod 200 is located away from the electromagnet 100. Figure 11 , the movable hook 13 shown in the lower part is away from the selection nose 216 of the corresponding retaining rod which is kept in the contact position so that its selection nose 216 is not in the path of the upper end of the blade 504 of the movable hook.

[0145] Near the upper dead point of their trajectories, the blade 504 of each movable hook 13 comes into contact with the guide ramp 218 of the corresponding retaining rod 200 and exerts, against the force exerted by the spring 340 engaged around the pin 220 of the retaining rod, a lateral force parallel to the axis Y100 directed towards the electromagnet. This lateral force causes the retaining rod to pivot about its oscillation axis A144 from its position away (as shown in the upper part of Figure 11 ) to its contact position (as shown in the lower part of Figure 11 ). This operation constitutes the levelling of the retaining rod 200.

[0146] During the displacement of each holding bar 200, between its position away from the electromagnet 100 and its position in contact with this electromagnet, the upper air gap defined by the radial gap J2 remains the same, with a non-zero value. During this displacement, the lower air gap defined between the outer attracting surface S208 and the second pole face S124 decreases until it has a non-zero width, as shown by the gap J1 in Figure 12 The non-zero value of the lower air gap is well controlled by the fact that both surfaces S204 and S208 are carried by the holding bar 200 and by the contact of the abutment surface S204 with the electromagnet, in particular at the level of its second pole face S124, which is arranged opposite the outer attracting surface S208.

[0147] The value of the gap J1 is chosen as a function of the magnetic force exerted on the holding bar 200 to keep it in the position in contact with the electromagnet 100, depending on the magnetic properties of the armature 202 and the stiffness constant of the spring 340. In practice, the value of the gap J1 is between 0.01 and 0.06 mm, preferably between 0.025 and 0.05 mm, more preferably around 0.04 mm.

[0148] If the electromagnet 100 is energized when the holding bar is in the contact position, a magnetic attraction force is exerted between the second pole face S124 and the surface S208. The magnetic circuit passing through the upper and lower air gaps and through the metal armature 206 of the holding bar 200 opposes the elastic force exerted by the spring 340, which keeps the bar in contact with the second pole face S124. In this case, the nose 216 of the holding bar 200 does not interfere with the downward movement of the blade 504 of the movable hook 13, which follows the downward movement of the knife portion 14. Conversely, if the electromagnet is not energized when the holding bar is in its contact position between the electromagnets, the holding bar is not kept in contact with the electromagnets and, under the action of the elastic force exerted by the spring 340, it pivots away from the second pole face S124 when the movable hook follows the descent of the knife portion. In this case, despite the downward movement of the knife portion 14, the nose 216 is chosen to engage in the hole 508 provided in the blade 504 to keep the movable hook 13 in an upper position close to the upper dead point of its trajectory by its surface S216.

[0149] Thus, the metal armature 202 of each holding bar 200 is configured to interact with the first pole face S122 and the second S124 of the electromagnet 100 according to the activation of this electromagnet in order to control the angular position of the holding bar with respect to the electromagnet around its swing axis A144. This makes it possible to choose, i.e. to keep in an upper position, or to release, i.e. to lower, the movable hook 13 stopped on the knife portion 14 when the knife portion 14 begins to move downward. In particular, the electromagnet 100 is used to control whether the holding bar 200 is kept in the position in contact with the electromagnet.

[0150] If the movable hook 13 is already held by the retaining rod 200, when the corresponding blade 14 reaches the vicinity of the top dead center position of its trajectory again, the blade 14 pushes the movable hook body 502 and the blade 504 upward again, and the blade again abuts against the guide ramp 218, so that the retaining rod is kept in contact with the second pole face S124 of the electromagnet 100 as part of the leveling. As previously described, depending on the activation of the electromagnet 100, the movable hook 13 may or may not be kept in contact with the electromagnet.

[0151] Alternatively, a movable hook ensures that the retaining rod moves from its remote position into its contact position without holding the retaining rod in contact with the electromagnet, the remaining travel of the retaining rod to its contact position being caused by energizing ("calling") the electromagnet.

[0152] In the first embodiment, a single abutment surface S204 is used, positioned as far as possible from the swing axis A144 of the retaining lever 200. This reduces the length of the metal armature 202 to the minimum required to establish a magnetic circuit between the first and second pole faces. Specifically, the metal armature may extend only to the junction between the abutment surface S204 and the outer attractive surface S208, as indicated by line L1. This reduces the length of the armature 202, thereby reducing the inertia of the retaining lever 200 and its cost.

[0153] exist Figure 16 In the second to fourth embodiments shown in FIG. 1 , elements similar to those in the first embodiment have the same references and operate in the same manner. Below, the differences between these embodiments and the first embodiment are primarily described. Where references are made to portions of the second to fourth embodiments that are not visible in the corresponding figures, such references should be understood to refer to the same referenced portions of the first embodiment.

[0154] exist Figure 16 and 17 In the second embodiment shown, a first pole surface S122 formed by the ferromagnetic core 102 of the electromagnet 100 is located at the lower transverse branch 122 of the ferromagnetic core 102 in the lower portion of the electromagnet 100, while a second pole surface S124 is located at the upper transverse branch 124 of the ferromagnetic core 102 in the middle portion of the electromagnet 100. In the operating configuration of the opening mechanism to which the electromagnet 100 belongs, the second pole surface S124 is arranged above the first pole surface S122 along the longitudinal direction of the electromagnet 100, parallel to the axis X100. The frame 104 of the electromagnet 100 has two positioning recesses 145 for receiving positioning members provided in the body 300 of the opening mechanism. The second pole surface S124 is notched and has a transverse groove 125 extending parallel to the axis Z100 and defining a separate strip of material therebetween in a manner similar to the grooves 224 and strips formed on the surface S204 of the first embodiment.

[0155] Here, two abutment surfaces S204 are defined on the retaining lever 200 , along a longitudinal direction parallel to the axis X200 , on either side of an outer attraction surface S208 defined by the armature 202 of this lever.

[0156] Furthermore, a portion 206 of the armature 200, the opening 210 of which engages around the guide shaft 144, is defined in the middle region of the rod 200. In other words, the armature 202 comprises, in addition to this portion 206, two branches 205 and 207 extending from this portion 206 in opposite longitudinal directions, substantially parallel to the axis X200, and carrying respectively a first portion 204A and a second portion 204B of the non-magnetic body 204 holding the rod 200.

[0157] The first portion 204A defines a selection nose 216 and a guide ramp 218. The second portion 204B defines two abutment surfaces S204. As in the previous embodiment, the spring 340 tends to move the abutment surfaces S204 away from the electromagnet 100 by default.

[0158] like Figure 17 As can be seen, when the retaining rod 200 is in contact with the electromagnet 100, one of these abutment surfaces S204, namely the abutment surface closest to the swing axis A144, abuts against the second pole face S124, while the second abutment surface S204 furthest from the swing axis A144 abuts against the surface S104 defined by the frame 104. For simplicity, this surface S104 is only shown in FIG. Figure 18 , in which a portion of the electromagnet 100 is omitted.

[0159] In this second embodiment, since the parts 204A and 204B of the non-magnetic body 204 are not integral, the part 204A can be omitted. In this case, the selection nose and the retaining ramp are formed directly on the armature 202 and can cooperate with a molded hook of synthetic material, as envisioned in EP-A-0823501.

[0160] exist Figure 18In the third embodiment shown, the guide shafts 144 are formed on the non-magnetic portion of the electromagnet 100, integral with the ferromagnetic core 102, but not integral with the non-magnetic frame 104 of the electromagnet 100. Therefore, these guide shafts 144 can be formed of a material different from the material of the frame 104 including the flange 142. Specifically, the guide shafts 144 are attached to the non-magnetic frame 104 of the electromagnet 100 and are inseparably connected to the non-magnetic frame 104 and the flange 142. The non-magnetic frame 104 then connects the shafts 144 and the core 102. The material of the guide shafts 144 can be a metal or a synthetic material that is non-magnetic and whose mechanical characteristics are particularly suitable for its function, for example, a ceramic material or a polymer outside the non-magnetic frame 104. Preferably, these guide shafts are connected to the frame 104 during the overmolding operation on the core 102.

[0161] exist Figure 19 In the fourth embodiment of the present invention shown in Figures 1 and 2, the non-magnetic frame 104 is injection molded from a polymeric material and formed before being assembled with the ferromagnetic core 102. In practice, the non-magnetic frame 104 defines a space for receiving the ferromagnetic core 102, which is centered in the receiving space by means of two pins 154 that are part of the frame 104 and pass through two correspondingly shaped holes 134 provided in the ferromagnetic core 102.

[0162] As in the first embodiment, the injection frame is integral and includes two guide shafts 144 and two flanges 142. These flanges, through their respective surfaces S144 and S142, define a space V1 with the first pole surface S122 for partially receiving the armatures of the two retaining rods, which may be the same as those of the first embodiment. Thus, the two guide surfaces S144 are formed on the integral portion 144 of the electromagnet.

[0163] As in the first embodiment, the integral housing 300 of this fourth embodiment defines a recess 314 in which the portion of the electromagnet 100 carrying the winding can engage, as well as two retaining rod receiving areas 316. Two housings 326 for accommodating the flange 142 and the guide shaft 144 are arranged on either side of the recess 314 along a transverse direction of the integral housing 300, which is parallel to the axis Y300 defined in the orthogonal reference system X300, Y300, Z300 as in the first embodiment. For the rest, this housing can be compared to the housing of the first embodiment, except that its geometry is adapted to Figure 19 The geometry of the electromagnet 100 is partially shown in FIG. Specifically, each housing 326 is defined by a planar surface 328 and a rib 330 that surrounds the flange 142 of the electromagnet 100 in the mounted configuration of the electromagnet in the housing 300 .

[0164] When the electromagnet 100 has been wound, Figure 19Starting with the configuration shown, the winding is wound around the middle portion 120, in contact with the side faces 120C and 120D, and around the strip 148 as defined in the first embodiment, which is placed in the housing 300, and then a quantity of polymeric material forming the cover 108 is introduced into the housing by overmolding and partially covers the electromagnet, in order to protect the winding and to fix the electromagnet 100 in an irremovable manner in the housing 300. During overmolding in the housing 300, the cover 108 is accommodated so as to maintain a certain distance from the first pole face S122 and the second pole face S124. This makes it possible to achieve Figure 21 Configuration, from Figure 21 In this embodiment, the retaining rods may be positioned in the housing 300 by engaging holes provided in respective armatures surrounding the guide shaft 144, as contemplated by the first embodiment.

[0165] In an alternative embodiment not shown, the winding is wound around the longitudinal branches and the central rod 120, contacting only one of the sides 120C or 120D, and around the bars 148, the frame extending along the axis Z100 between the two bars 148 relative to the other of the sides 120C or 120D.

[0166] exist Figures 16 to 21 In the embodiment of FIG. 5 , in the contact configuration of the retaining rod 200 in contact with the electromagnet 100 , and as in the first embodiment, there is an air gap of non-zero width between the surface S208 and the second pole face S124 or equivalent.

[0167] Regardless of the embodiment, the fact that the holding lever's oscillation axis is positioned longitudinally at the height of the first pole face ensures excellent control of the air gap between the armature of the movable holding lever and this first pole face, with the radial width of the air gap being equal to the non-zero gap J2 radially to axes A122, A144, regardless of the position of the holding lever between its remote position and its position in contact with the electromagnet. Alternatively, gap J2 can be variable within the angular range of the air gap between the armature and the first pole face. On the other hand, when the holding lever is in its position in contact with the electromagnet, the abutment surface ensures excellent control of the air gap, equal in width to gap J1 between the holding lever and the second pole face, measured parallel to axes Y100, Y200, and Y300. Because the abutment surface is located on the holding lever, rather than on the electromagnet, its position relative to the guide ramp and selector nose is very precisely defined, in particular with greater precision than if such a surface were provided on the electromagnet. Furthermore, providing the abutment surface on the holding lever simplifies the construction of the electromagnet, which is a more complex and cumbersome component to manufacture than the holding lever itself.

[0168] Regardless of the embodiment, forming the flange 142 integrally with the non-magnetic housing 104 of the electromagnet 100 maximizes the positioning accuracy between the retaining rod 200 and the ferromagnetic core 102 in directions parallel to the axes Z100, Z200, and Z300. This allows for good control of the air gap between the retaining rod 200 and the electromagnet 100.

[0169] Regardless of the embodiment, defining the guide surface S144 on the electromagnet 100 allows the electromagnet to be tested for proper operation by means of a test depression rod before being installed in the integral housing 300 .

[0170] By positioning the first pole surface S122 of the electromagnet 100 near the swing axis A144 and controlling the air gap between each retaining rod 200 and the ferromagnetic core 102, the angular amplitude of the cylindrical portion forming the first pole surface 122 can be reduced by distributing the cylindrical portion relative to the transverse plane P144, as described above with respect to angles α, α1, and α2. In practice, due to the improved geometric accuracy of the air gap achieved at this height compared to the prior art, the angular amplitude of the air gap in some cylinders and the outer diameter of the guide shaft 144 can be reduced.

[0171] In the first three embodiments of the invention, in which the electromagnet 100 with its cover 108 is mounted in an integral housing 300, no overmolding operation in the housing is required, which simplifies the manufacture of this part of the opening mechanism 7, allowing wider tolerances to be used, which is more advantageous since the housing 300 is a relatively thin and slender component.

[0172] In the first three embodiments of the present invention, the electromagnet 100 is easily mounted on the integral housing 300 by fitting with minimal or no clearance, and is compatible with disassembly of the opening mechanism. Therefore, if the guide shaft 144 becomes worn, the electromagnet 100 to which it belongs can be easily replaced without having to modify the integral housing 300 or other components contained therein.

[0173] Whatever the embodiment, the presence of the grooves 314 and the fact that the windings 106 are in direct contact with the sides 120C and 120D of the central rod 120 of the ferromagnetic core 102 provide each integral housing 300 equipped with an electromagnet 100 with a good compact form, along a direction parallel to the axis Z300.

[0174] In various embodiments, the offset of the deflectors on each lateral side of the integral housing causes them to form a relatively long edge on each lateral side of the retaining rod, which improves the seal obtained.

[0175] In all embodiments, in the mounted configuration of the selection device 400 in the opening mechanism 7, the first pole face S122 is offset relative to the second pole face S124 along the longitudinal direction of the opening mechanism, parallel to the subsequently coinciding axes X100 and X300. The winding extends longitudinally between the first pole face S122 and the second pole face S124.

[0176] According to a variant of the invention (not shown), the guide surface formed on the electromagnet 100 and interacting with the retaining rod 200 is a surface arranged outside the retaining rod 200, that is, a surface that partially surrounds it. Such a guide surface can be a concave surface in the form of a portion of a cylinder, which faces the cylindrical outer radial surface of the rod 200, centered about the oscillation axis, for example, on the side opposite the core of the electromagnet 100. This is a mirror image of the configuration shown in the figures. As in all embodiments, the guide surface is separated from any pole face of the electromagnet and is preferably located on the frame 104. When the oscillation axis of the rod is at the level of the first pole face, the radial clearance between the guide surface and the cylindrical outer radial surface of the rod is strictly smaller than the size of the air gap between the first pole face and the facing surface of the rod.

[0177] According to another variant of the present invention (not shown), the electromagnet 100 can be installed in the integral housing 300 so that its guide shafts 144 extend from the flange 142 toward the bottom 303 of the housing half 302 that accommodates the electromagnet 100. The longitudinal end 206 of the retaining rod 200 is then accommodated between the flange 142 and the bottom 302 of the housing half 302 that accommodates the electromagnet 100. The free end 144E of the shaft of each guide shaft 144 then mates with a recessed housing, similar to the recessed housing 344 of the first embodiment, which is not provided on a second adjacent housing but is provided in the bottom 303 of the housing 300 that accommodates the electromagnet 100.

[0178] According to another variant of the invention, not shown, a centering pin similar to the centering pin 146 is provided in the integral housing 300, while a correspondingly shaped recess similar to the recess 320 is provided on the electromagnet, preferably in its non-magnetic frame 104. This facilitates the placement of the electromagnet 100 in the housing 300, similar to the cooperation of the elements 146 and 320 in the first embodiment.

[0179] According to another variant of the invention, not shown, the swing axis A144 may extend in a direction parallel to the axis Y100 instead of parallel to the axis Z100. The flange 142 then preferably extends in a plane parallel to the plane formed by the axes X100 and Z100.

[0180] According to a variant of the invention (not shown), in the context of a two-position mechanism, the housing can house two electromagnets, each defining two guide shafts, these two electromagnets being stacked in the longitudinal direction, as described, for example, in EP-B-1 619 279, to allow access to three or four positions of the healds, which allows weaving fabrics other than so-called "flat" fabrics. The selection device then comprises two or more movable hooks integral in pairs to a single thread.

[0181] According to another variant of the invention, not shown, a single movable hook 13 or more than two movable hooks may be provided in the housing 30 .

[0182] The above-conceived embodiments and modifications can be combined to create new embodiments of the present invention.

Claims

1. A shedding mechanism (7) on a jacquard loom (M), comprising: A housing (300) extending in a longitudinal direction (X100, X200, X300) and at least one movable hook (13), wherein a knife portion (14) enables the movable hook to move in the housing along the longitudinal direction between a bottom dead center position and a top dead center position, and wherein the hook can be held by a selection device (400) when in or near the top dead center position, the selection device comprising at least: - an electromagnet (100) mounted and fixed in said housing (300) and comprising o a ferromagnetic core (102) comprising a first pole face (S122) and a second pole face (S124), These pole faces are offset from one another along said longitudinal directions (X100, X200, X300), and o non-magnetic parts (104, 106, 108, 110), which are integral with the ferromagnetic core, a retaining lever (200) configured to retain the movable hook when the movable hook is at or near its top dead center position, the retaining lever being mounted to pivot about a swing axis (A144) between a remote position remote from the electromagnet and a contact position in contact with the electromagnet, and comprising a ferromagnetic armature (202) magnetically interacting with the first and second pole faces to control the angular position of the retaining lever about the swing axis, It is characterized by - the non-magnetic portion of the electromagnet comprises a guide surface (S144) for the pivoting movement of the retaining lever (200) about the swing axis (A144), the guide surface cooperating with the retaining lever in a direction radial to the swing axis (A144) between the remote position and the contact position, and The guide surface (S144) is cylindrical with a circular base centered on the swing axis.

2. The mechanism according to claim 1, characterized in that The guide surface (S144) is an outer peripheral surface of a guide shaft (144) around which the retaining lever (200) is pivotally mounted.

3. The mechanism according to claim 1, characterized in that The non-magnetic portion of the electromagnet further comprises a flange (142), the guide surface (S144) extending from the flange, and wherein a space (V1) for accommodating a portion (206) of the retaining rod is defined by the guide surface (S144) in a direction radial to the swing axis (A144) and by the flange (142) in a direction parallel to the swing axis.

4. The mechanism according to claim 3, characterized in that The guide surface (S144) is an outer peripheral surface of a guide shaft (144) around which the retaining lever (200) is pivotally mounted, and wherein the flange (142) is arranged in a ring shape around one end of the guide shaft (144).

5. The mechanism according to claim 3, characterized in that The guide surface (S144) is the outer peripheral surface of the guide shaft (144), the retaining rod (200) is pivotally mounted around the guide shaft, the housing (300) is formed by a housing half (302) and a cover (308) for accommodating the selection device (400), the housing half and the cover are superimposed in a second direction (Z300) of the housing perpendicular to the longitudinal direction, wherein the swing axis (A144) extends along the second direction (Z300) of the housing, wherein the housing half (302) or the cover (308) forms a The guide shaft (144) comprises a concave shell (344, 336) of complementary shape and an annular surface (338) formed around the hollow shell, wherein a free end (144E) of the guide shaft (144) opposite to the flange (142) is engaged in the hollow shell (344) and pressed against the bottom (346) of the hollow shell along the second direction (Z300) of the shell, and wherein a portion (206) of the retaining rod (200) is arranged between the flange and the annular surface along the second direction (Z300) of the shell.

6. The mechanism according to any one of claims 1 to 5, characterized in that: The first pole surface (S122) of the ferromagnetic core (102) is a portion of a cylinder centered on the swing axis (A144), wherein a portion of the armature (202) of the retaining rod is inserted between the guide surface (S144) and the first pole surface (S122) in a direction radial to the swing axis (A144), and wherein, between the contact position and the distance position of the retaining rod, the cooperation between the guide surface (S144) and the retaining rod ensures that there is no contact between the first pole surface (S122) and the armature.

7. The mechanism according to claim 6, characterized in that The first pole surface (S122) extends on both sides of a transverse plane (P144) passing through the swing axis (A144) and perpendicular to the longitudinal direction (X100, X200, X300), and wherein the ratio between the angular amplitude (α1) of the portion (S122A) of the first pole surface located on the same side as the second pole surface (S124) relative to the transverse plane and the total angular amplitude (α) of the first pole surface is between 0.2 and 0.

4.

8. The mechanism according to claim 7, characterized in that The ratio between the angular amplitude (α1) of the portion (S122A) of the first pole face located on the same side of the transverse plane as the second pole face (S124) and the total angular amplitude (α) of the first pole face is equal to 0.

33.

9. The mechanism according to any one of claims 1 to 5, characterized in that The armature (202) of the retaining rod (200) includes an outer attraction surface (S208), which is opposite to the second pole face when the retaining rod is in a position of contact with the electromagnet, wherein the retaining rod (200) includes a non-magnetic body, the non-magnetic body is integral with the armature and includes at least one abutment surface (S204), the abutment surface: Adjacent to the outer attraction surface (S208) • protruding in the direction of the electromagnet (100) relative to the outer attraction surface When the holding rod is in a position away from the electromagnet, the holding rod is away from the electromagnet; and When the holding rod is in contact with the electromagnet, the holding rod contacts the electromagnet. And wherein, when the retaining rod is in a position of contact with the electromagnet, the outer attraction surface (S208) is away from the second pole face (S124).

10. The mechanism according to any one of claims 1 to 5, characterized in that The non-magnetic portion of the electromagnet includes a frame (104), the frame including the guide surface (S144), and the frame is made of a polymeric material overmolded onto the ferromagnetic core (102).

11. The mechanism according to any one of claims 1 to 5, characterized in that The electromagnet is fixed in the housing (300) by form fit by installing a centering pin (146) in the centering housing (320) along a direction (Z300) perpendicular to the longitudinal direction (X300) of the housing.

12. The mechanism according to any one of claims 1 to 5, characterized in that The non-magnetic portion of the electromagnet includes a frame (104), the frame including the guide surface (S144), the frame being formed prior to assembly with the ferromagnetic core (102), and wherein a quantity of polymeric material (108) extends around the core and the frame to retain the electromagnet in the housing (300).

13. The mechanism according to any one of claims 1 to 5, characterized in that: The selection device (400) comprises at least two retaining rods (200), which are arranged at the same longitudinal height in the housing (300) and are located on each side of the electromagnet (100) along a direction (Y300) perpendicular to the longitudinal direction (X100, X200, X300), and each retaining rod interacts with one of the two second pole faces (S124) and one of the two first pole faces (S122) of the ferromagnetic core (102), and wherein these guide surfaces (S144) respectively cooperating with the retaining rods are formed on the parts (144) of the electromagnet that are integral with each other.

14. The mechanism according to any one of claims 1 to 5, characterized in that The winding (106) of the electromagnet (100) is wound on the middle portion (120) of the ferromagnetic core (102), arranged longitudinally between the first pole face and the second pole face, and in contact with at least one side face (120C, 120D) of the ferromagnetic core (102).

15. The mechanism according to any one of claims 1 to 5, characterized in that A surface (S210) of the first longitudinal end (206) of the retaining rod cooperates with the guide surface (S144) to pivot the retaining rod between the remote position and the contact position, and wherein, in the operating configuration of the mechanism, the retaining rod (200) generally extends downwardly from the first longitudinal end (206) along the longitudinal direction (X100, X200, X300).

16. A jacquard loom (M), characterized in that: It comprises an opening mechanism (7) according to one of the preceding claims.

Images