EP4015687A1 - Fachbildungsmechanismus und webmaschine vom typ jacquardwebmaschine, die mit einem solchen mechanismus ausgestattet ist - Google Patents

Fachbildungsmechanismus und webmaschine vom typ jacquardwebmaschine, die mit einem solchen mechanismus ausgestattet ist Download PDF

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Publication number
EP4015687A1
EP4015687A1 EP21216581.5A EP21216581A EP4015687A1 EP 4015687 A1 EP4015687 A1 EP 4015687A1 EP 21216581 A EP21216581 A EP 21216581A EP 4015687 A1 EP4015687 A1 EP 4015687A1
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EP
European Patent Office
Prior art keywords
electromagnet
axis
retaining lever
oscillation
housing
Prior art date
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Granted
Application number
EP21216581.5A
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English (en)
French (fr)
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EP4015687B1 (de
Inventor
Alexis Porte
Pascal Guenard
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Staeubli Lyon SA
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Staeubli Lyon SA
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Publication of EP4015687A1 publication Critical patent/EP4015687A1/de
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/02—Single-lift jacquards
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/20—Electrically-operated jacquards
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C5/00—Cam or other direct-acting shedding mechanisms, i.e. operating heald frames without intervening power-supplying devices
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C13/00—Shedding mechanisms not otherwise provided for
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/12—Multiple-shed jacquards, i.e. jacquards which move warp threads to several different heights, e.g. for weaving pile fabrics
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/24—Features common to jacquards of different types
    • D03C3/26—General arrangements of jacquards, or disposition in relation to loom

Definitions

  • the present invention relates to a mechanism for forming the shed on a Jacquard-type loom, as well as a Jacquard-type loom equipped with such a mechanism.
  • a shedding mechanism selectively raises heddles each comprising an eyelet through which a warp thread passes. Depending on the position of a hook to which the upper end of each heddle is connected, the thread which crosses its eyelet is located above or below a weft thread moved by the loom.
  • a shedding mechanism comprises several mobile hooks each provided with a lateral beak intended to cooperate with a knife driven in a vertical alternating movement.
  • Each movable hook is provided to interact with a retaining member which belongs to a selection device which is part of the shedding mechanism, this retaining member being controlled by means of an electromagnet.
  • the solenoid may be mounted in a housing which defines a pivot shaft for each retaining lever.
  • the relative position of the retaining lever and of the electromagnet, in particular of an attraction surface of this lever with respect to a polarization surface of the electromagnet therefore depends on the positioning of the electromagnet in the housing. Depending on the manufacturing and positioning tolerances, this relative position may therefore vary, within the mechanism for forming the shed, for the various selection devices. This position may also vary over time.
  • the value of an air gap or air gaps formed between the retaining lever and the ferromagnetic core of the electromagnet is dependent on variations in the positioning of the electromagnet in the housing, which can greatly influence the magnetic force exerted between the lever and the electromagnet, when the latter is activated.
  • Comparable structures are known from EP-A-0823501 , EP-A-0851048 , EP-A-0899367 , EP-A-1619279 and EP-A-1852531 , which are generally satisfactory but induce similar problems in terms of variations in the relative positioning of the retaining levers and the electromagnet.
  • the present invention aims to improve the precision and the reliability of the selection obtained thanks to the mechanism of formation of the crowd, in which the relative position of the retaining lever and of the electromagnet is determined in a precise and reliable manner, which makes it possible to precisely control the force of magnetic attraction between these elements and the supply current of the electromagnet.
  • the invention relates to a mechanism for forming the shed on a loom of the Jacquard type, this mechanism comprising a casing which extends in a longitudinal direction, at least one mobile hook, moved in the casing by a knife in the longitudinal direction, between a bottom dead center position and a top dead center position, in or close to which the hook can be retained by a selection device which comprises at least one electromagnet, which is attached and immobilized in the housing and which includes a ferromagnetic core comprising a first polar surface and a second polar surface, these polar surfaces being offset from each other in the longitudinal direction, and a non-magnetic part secured to the ferromagnetic core.
  • the selection device also comprises a retaining lever configured to retain the movable hook when the latter is in or close to its top dead center position.
  • the retaining lever is pivotally mounted about an axis of oscillation, between a position remote from the electromagnet and a position pressed against the electromagnet, and comprises a ferromagnetic armature which magnetically interacts with the first and second pole surfaces to control the angular position of the retaining lever around the axis of oscillation.
  • the non-magnetic part of the electromagnet comprises a surface for guiding the pivoting of the retaining lever around the axis of oscillation, this guiding surface cooperating with the retaining lever in a direction radial to the axis of oscillation between the remote position and the tackled position.
  • the guiding surface is cylindrical with a circular base, centered on the axis of oscillation.
  • the magnetic force necessary to maintain the retaining lever in the position pressed against the electromagnet is therefore the same for all the selection devices of the shedding mechanism, which is advantageous in terms of controlling the weaving process on the loom. to weave.
  • the invention relates to a loom of the Jacquard type which comprises a shedding mechanism as mentioned above.
  • This loom has the same advantages as the shedding mechanism.
  • a layer of warp threads 1 comes from a beam 2.
  • Each warp thread 1 passes through the eyelet 3a of a heddle 3 intended to open the pitch to allow the passage of a weft in order to form a fabric T which is wound on a reel 4.
  • Only two heddles 3 and 3' are represented on the figure 1 , the smooth 3 being in the high position, while the smooth 3' is in the low position.
  • the lower end of each rail is connected to the frame fixed to the loom M by a tension spring 5, while its upper end is secured to a yoke 6.
  • each arch has one end 6a integral with a casing 10 of the mechanism for forming the shed 7, this arch passing through a muffle 11 suspended from a cord 12 whose two ends are respectively attached to two mobile hooks 13 intended to be selectively lifted by blades 14 driven by a movement of alternating vertical oscillations in phase opposition, as represented by the arrows F1 at the figure 1 .
  • a muffle 11 suspended from a cord 12 whose two ends are respectively attached to two mobile hooks 13 intended to be selectively lifted by blades 14 driven by a movement of alternating vertical oscillations in phase opposition, as represented by the arrows F1 at the figure 1 .
  • Other configurations of arches, cords and mittens are possible.
  • FIG. figure 1 Only part of the constituent elements of the shed formation mechanism 7 is represented in FIG. figure 1 , for the clarity of the drawing.
  • the shed formation mechanism 7 can also be described as a “Jacquard module” and comprises a stack of several unitary boxes, for example eight boxes.
  • a selection device comprising an electromagnet and two retaining levers, is disposed in each unitary housing.
  • two hooks 13 are movable in each unit box longitudinally, that is to say along the longest dimension of the box 10, which is vertical in the installed configuration of this box within the mechanism for forming the shed 7 mounted in the loom M.
  • These two mobile hooks are preferably attached to the same cord, such as the cord 12 shown in figure 1 from which hangs the muffle 11 through which the arch 6 passes.
  • Each electromagnet 100 of the shedding mechanism 7 comprises a ferromagnetic core 102, shown alone in picture 2 , a carcass 104 made of non-magnetic material, a winding 106 wound around an intermediate part of the core 102, a casing 108 and electrical contacts 110 intended to be connected to two electrical cables, not shown, which connect it to the electronic control unit 8 and which allow the selective supply of this electromagnet 100.
  • the carcass 104 and the casing 108 together form a 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.
  • “Non-magnetic” means with a very low magnetic susceptibility, such that a non-magnetic part cannot magnetically interact with a ferromagnetic part.
  • X100 a longitudinal axis of the electromagnet 100 oriented from top to bottom at the picture 2 .
  • Y100 a transverse axis of the electromagnet 100 oriented from left to right at the figure 4 .
  • Z100 an axis of thickness or depth of the electromagnet 100, that is to say also the axis of smallest dimension of the electromagnet 100.
  • the axes X100, Y 100 and Z100 together form a reference direct orientation orthogonal.
  • the figure 4 and 6 are sections taken respectively in the direction of the X100 axis at the picture 3 and in the opposite direction to the X100 axis at the figure 5 .
  • Core 102 has a thickness e102, measured parallel to axis Z100, which is constant.
  • the core 102 has an overall I-shape, with a longitudinal and central branch 120, which extends in a direction parallel to the axis X100, and two transverse branches 122 and 124, which extend mainly in directions parallel to the Y100 axis.
  • the longitudinal and central branch 120 is an intermediate part between the transverse branches 122 and 124.
  • the lateral ends of the upper transverse branch 122 form two upper pole surfaces S122 of the electromagnet 100, these first pole surfaces being defined in the edge of the core 102, being concave and being in the form of a section of a circular section cylinder centered on a axis A122 perpendicular to the flat main surfaces of the core 102.
  • the axes A122 are parallel to the axis Z100.
  • the lateral ends of the lower transverse branch 124 form two lower pole surfaces S124 of the electromagnet 100. These second pole surfaces S124 are formed in the edge of the core 102, flat and parallel to the axes X100 and Z100.
  • the first pole surfaces S122 are offset from the second pole surfaces S124 along the axis X100.
  • a centering notch 126 is made in the middle part of the lower branch 124, on an edge of this lower branch opposite the central branch 120.
  • the centering notch is arranged between and at equal distance from the lower pole surfaces S124, according to the Y100 axis.
  • the carcass 104 is molded around the core 102 which it partially surrounds.
  • overmoulded we mean that the material of the carcass 104 is injected into a mold in which the core 102 has been placed beforehand, so that the material of the carcass 104 surrounds this core 102 and is fixed on this core after hardening.
  • the carcass 104 is formed in a non-magnetic material, for example of the thermoplastic polymer type, optionally filled with fibers. So the carcass 104 is integral with core 102 and has a fixed position relative to core 102.
  • the carcass surrounds the upper transverse branch 122 of the core 102 while being flush with the surfaces S122.
  • the carcass 104 is extended, on either side of the upper transverse branch 122, by a flange 142 and by a guide shaft 144 centered on a respective axis A144.
  • the two parts 142 and the two parts 144 are parts of the carcass 104 which are integral with the rest of the carcass 104, in particular with the part of this carcass which is arranged around the upper transverse branch 122.
  • each guide shaft 144 is connected to the carcass 104 and in particular to the adjacent sole 142 in a non-removable manner.
  • the A144 axes are parallel to the Z100 axis.
  • Each axis A144 coincides with the central axis A122 of the adjacent upper pole surface S122. Thus each axis A144 is at the same longitudinal level as the adjacent upper pole surface S122.
  • Each guide shaft 144 has a cylindrical outer shape with a circular section and S144 denotes its outer peripheral surface.
  • the carcass 104 also defines a centering pin 146 which extends facing a middle portion of the upper branch 122 and which is centered on an axis A146 parallel to the axes A144 and to the axis Z100.
  • the centering pin 146 is also cylindrical with a circular section. Unlike the guide shafts 144, it is hollow, whereas the guide shafts are solid.
  • the carcass 104 comprises two bands 148 which cover the edges 120A and 120B of the central branch 120, which are perpendicular to the axis Y100, but not the side faces 120C and 120D of this central branch, which are perpendicular to the axis Z100 .
  • the carcass 104 also includes a foot 150, which covers the junction zone between the branches 120 and 124, and slats 152.
  • the lower transverse branch 124 protrudes from the carcass 104 both in a longitudinal direction of the ferromagnetic core 102, parallel to the axis X100, and in a transverse direction of this core, parallel to the axis Y100.
  • the carcass 104 does not extend at the level of the lower pole surfaces S124.
  • a sole 142 is arranged near one end of each guide shaft 144 and extends in a crown around the latter, while connecting this shaft to the rest of the carcass 104.
  • the soles 142 are formed on the non-magnetic part of the electromagnet 100.
  • S142 a surface of each sole 142 which is annular, perpendicular to the axis Z100 and turned towards the side of the guide shaft 144 that this sole surrounds.
  • This surface S142 is perpendicular to the axis A144 of the adjacent guide shaft 144 and extends in a crown, that is to say over 360°, around this guide shaft.
  • Surfaces S142 and S144 are adjacent and perpendicular.
  • S'142 denotes the peripheral surface of a sole 142. This surface is in the form of a cylinder portion with a circular base centered on the axis A144 of the adjacent guide shaft 144. Thus, the peripheral surface S'142 of a sole 142 is coaxial with the outer peripheral surface S144 of the adjacent guide shaft 144.
  • the surface S142 of a sole 142 delimits, with the outer peripheral surface S144 of the adjacent guide shaft 144 and with the upper polar surface S122 which faces it, a volume V1 for receiving part of a shift lever. restraint 200 represented alone at figures 7 to 9 . More precisely, the surface S144 defines the volume V1 radially to the axis A144 in a direction converging towards this axis. The surface S122 defines the volume V1 radially to the axis A144 in a direction diverging with respect to this axis. The surface S142 defines the volume V1 axially, in a direction going from a free end 144E of the shaft 144 towards the adjacent flange 142, that is to say here in a direction opposite to that of the axis Z100.
  • the volume V1 which is defined by the electromagnet 100, can be described as a partial reception housing for the retaining lever 200.
  • each guide shaft 144 is constituted by a part of the electromagnet 100, in particular in one piece with the carcass 104, makes it possible to reduce the positioning tolerances of this guide shaft with respect to the ferromagnetic core 102 , more precisely the positioning tolerances between surfaces S144 and S122. This contributes to the precision of the geometric definition of the volume V1 and to the precision of the guiding of the retaining lever 200 with respect to the ferromagnetic core 102.
  • the winding 106 is produced by winding a wire in the form of a turn around the central branch 120 of the ferromagnetic core 102 equipped with strips 148. This winding is carried out after the overmoulding of the carcass 104 on the ferromagnetic core 102 so that the winding 106 is in contact with the side faces 120C and 120D of the central branch 120 but separated from the slices 120A and 120B by the strips 148. Each end of the wire constituting the winding 106 is connected to one of the two electrical contacts 110. The carcass 104 then provides the electrical insulation between the two electrical contacts 110, and the electrical insulation between the core 102 and the two electrical contacts 110, including at their connection to the winding 106.
  • the covering 108 is applied to the parts 102, 104 and 106 by low pressure overmolding and forms, in particular, a layer of protection of the winding 106.
  • the geometry of the casing 108 is deduced from the comparison of the figure 3 and 5 .
  • the casing 108, the winding 106 and the electrical contacts are then integral with the core 102.
  • An orthogonal reference mark X200, Y200, Z200 is defined associated with each retaining lever 200, with an axis X200 parallel to the largest dimension of the lever 200, that is to say that it forms a longitudinal axis for this lever, a transverse axis Y200, parallel to the width of the lever and a depth axis Z200, parallel to the thickness of the lever.
  • the axis X200 is oriented downwards when the retaining lever 200 is mounted within the shedding mechanism 7.
  • the lever 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 interacts magnetically with the first and second polar surfaces S122, S124, as well as this emerges from the following explanations.
  • 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 crosses it right through according to its thickness and which is with a circular section centered on an axis A210 parallel to the axis Z200.
  • S210 the peripheral surface of the housing 210 which is an internal surface of the first end 206.
  • S206 the external peripheral surface of the end 206.
  • a portion S206A of this external peripheral surface S206 has a circular base centered on the axis A210. This portion S206A itself forms an outer surface of the first longitudinal end 206
  • the second longitudinal end 208 of the armature 202 defines a second housing 212 which also crosses this armature from side to side, according to its thickness and in which the non-magnetic body 204 is anchored by means of a bar 214, integral with the rest of the non-magnetic body 204 and which crosses the housing 212 right through.
  • the non-magnetic body 204 is formed of a synthetic material, in particular a plastic material, for example of the thermoplastic polymer type, optionally loaded with fibers, which is molded onto the metal frame 202 by filling the second housing 212, this which forms the bar 214.
  • the non-magnetic body 204 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 it in the direction of the longitudinal axis X200, that is to say opposite the first longitudinal end 206.
  • the non-magnetic body 204 forms a selection beak 216, a guide ramp 218 and a pin 220 surrounded, over its entire periphery, by a flange 222.
  • the surface S216 of the selection beak facing towards the armature 202 and towards the first end 206 makes it possible to retain a movable hook 13 in or close to its top dead center position, by engaging in an orifice of this movable hook.
  • the beak 216 and the ramp 218 are located on the same side of this body, while the pin 220 and the collar 222 are located on the other side of this body.
  • Surface portion S206A is located on the same side of retaining lever 200 as pin 220.
  • the body 204 also includes an abutment surface S204 intended to selectively bear against the electromagnet 100, depending on the position of the retaining lever.
  • the selector 216, the guide ramp 218 and the pin 220 are formed integrally with the abutment surface S204.
  • abutment surface S204 is adjacent to an external surface of attraction S208 formed by second end 208 of armature 202, more particularly by a slice of a portion 208A of this second end which is not covered by the non-magnetic body 204.
  • the abutment surface S204 is adjacent to the external surface of attraction S208 insofar as the abutment surface S204 and the attraction outer surface S208 have a common boundary.
  • the surfaces S206A and S208 are in electrical continuity since the armature 202 extends without discontinuity between these surfaces. This follows, in particular, from the fact that, in this example, the armature 202 is in one piece.
  • the portion 208A of the end 208 which defines the external surface of attraction S208 constitutes the portion of the armature 202 furthest from the first end 206.
  • the armature 202 extends, in the direction of the axis X200, from the first end 206 to the junction of the external surface of attraction S208 with the abutment surface S204. In other words, the armature 202 does not extend, over a significant length, inside the non-magnetic body 204, beyond the portion 208A.
  • the stop surface S204 is generally flat and parallel to the axes X200 and Z200. It is equipped with transverse grooves 224, parallel to the axis Z200, and which are juxtaposed along the longitudinal direction of the lever which is parallel to the axis X200. These grooves 224 have the effect that the surface S204 is not smooth but crenellated because it is formed from a juxtaposition of strips of material separated by the grooves 224.
  • Deflectors are formed by the non-magnetic body 204 and are integral with the rest of this body.
  • a first deflector 226 extends around the non-magnetic body 204, longitudinally at the same level as the abutment surface S204 but opposite this surface in the direction of the transverse axis Y200.
  • Two other deflectors 228 and 230 are formed by the non-magnetic body 204 on the same side as the abutment surface S204 but at different levels along the longitudinal axis X200, on either side of this surface along this axis X200.
  • the deflector 228 is arranged, along the axis X200, between the first longitudinal end 206 and the abutment surface S204, while the second deflector 230 is arranged, along the axis X200, between the surface stop S204 and the pin 220.
  • Junction strips 232 connect the deflectors 228 and 230 along the longitudinal direction of the retaining lever 200. These junction strips 232 are arranged, along the axis Z200, on either side of the surfaces S204 and S208.
  • the deflector 226 connects to the junction strips 232.
  • the deflectors 226, 228 and 230 are in continuity with each other.
  • the deflectors 228 and 230 and the junction strips 232 form a continuous border around the surfaces S204 and S208 seen in the direction of the arrow VIII at the figure 7 .
  • Deflector 226 is disposed on the same side of non-magnetic body 204 as selector beak 216, while pair of deflectors 228 and 230 are disposed on the same side as abutment surface S204 and external attraction surface S208.
  • the deflector 226 is arranged longitudinally, that is to say along the axis X200, between the deflectors 228 and 230.
  • the shedding mechanism 7 also includes one or more unitary housing(s) 300 which forms part of the housing 10.
  • the number of housings 300 which form part of the shedding mechanism 7 depends on the number of electromagnets 100. In practice, there are provided as many unit boxes 300 as electromagnets 100.
  • An orthogonal marker X300, Y300, Z300 is associated with each unit box 300. This marker is defined respectively by a longitudinal axis X300, a transverse axis Y300 and a depth axis Z300 of the unit box 300.
  • Each unitary box 300 comprises a half-shell 302 visible in its entirety in the upper part of the figure 10 and which delimits a portion 304 of reception of a selection device 400 formed of an electromagnet 100 and two associated retaining levers 200, and a guide portion 306 of the two mobile hooks 13 intended to be selected by means of the selection device.
  • the unitary box 300 illustrated in the figures, with its electromagnet 100, comprising two pairs of first and second polar surfaces, and its two retaining levers 200 arranged on either side of the electromagnet along the axis Y100, is used in two-position Jacquard-type shedding mechanisms used for weaving so-called "flat" fabrics.
  • the reception portion 304 is shown on a larger scale in the lower right part of the figure 10 , while a portion of a cover 308, corresponding to the portion 304, is represented in the lower left part of the figure 10 .
  • the half-shell 302 and the cover 308 together constitute a unitary housing 300.
  • the bottom 303 of the half-shell 302 which is parallel to the axes X300 and Y300, carries longitudinal grooves 310 for guiding the movement of slats 504 which belong to the mobile hooks 13.
  • This bottom is also pierced with orifices 312 for the passage of rods or screws for securing several casings 300 belonging to a stack of unitary casings of the shedding mechanism 7 which together form all or part of the casing 10.
  • the unitary casing 300 defines a recess 314, which crosses the bottom 303 right through and which delimits a volume for partial reception of the electromagnet 100, and two zones 316 for receiving two associated retaining levers 200 to electromagnet 100.
  • the bottom 303 of the half-shell 302 is crossed, right through in the direction of the axis Z300, by a centering housing 320 of circular shape and intended to receive the centering pin 146 in the assembled configuration of the electromagnet. 100 in the unitary housing 300.
  • This centering housing has a geometry complementary to that of the centering pin 146.
  • a centering pin 322 protrudes from the bottom 303, parallel to the axis Z300, and is arranged, along the axis X300, between the recess 314 and the guide portion 306. This centering pin 322 is arranged opposite the centering housing 320 with respect to the recess 314. This centering pin is intended to be engaged in the centering notch 126 of the ferromagnetic core 102 in the assembled configuration of the electromagnet 100 in the unitary casing 300.
  • the unitary housing 300 also forms baffles 324 in each zone 316 for receiving a retaining lever 200.
  • the unitary casing 300 defines a housing 326 in the form of a portion of a circular section cylinder for receiving a sole 142 of the electromagnet 100.
  • Each housing 326 is defined by an annular surface 328 and by a rib 330 which is of cylindrical internal shape with a circular section and complementary to the external peripheral surface S'142 of a sole 142 of the electromagnet 100.
  • the lid 308 the face of which visible at the figure 10 is that which is normally turned towards the bottom 303 of the half-shell 302, defines holes 332 for the passage of rods or fixing screws, these holes 332 being aligned with the holes 312 in the mounted configuration of the cover 308 on the half- shell 302.
  • This cover 308 also defines a centering housing 334 which is aligned with the centering housing 320 in the mounted configuration of the cover 308 on the half-shell 302. Alternatively, the cover 308 may not include a centering housing 334
  • This cover 308 also defines two recessed housings 336, each formed by an annular flat surface 338 and by 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 half-shell 302.
  • the elements 302 and 308 are made by injection of electrically insulating polymer material, optionally loaded with reinforcing fibers in order to improve their mechanical properties. Elements 302 and 308 are non-magnetic.
  • the first longitudinal end 206 of the metal armature 202 is mounted around one of the guide shafts 144.
  • the axes A144 and A210 coincide
  • the surfaces S144 and S210 face radially to the axis A144 and the respective dimensions of the surfaces S144 and S210 are chosen to allow pivoting of each retaining lever 200 around the axis of oscillation X144 while effectively guiding this pivoting movement.
  • the orthogonal marker X100, Y100, Z100 and each orthogonal marker X200, Y200, Z200 are globally coincident, neglecting the amplitude of oscillation of a retaining lever 200 around the axis A144 of the guide shaft around which the retaining lever 200 is mounted.
  • each retaining lever 200 extends globally in the longitudinal direction of the unit housing 300, that is to say parallel to the axis X300, downwards at from the first end 206 of this retaining lever.
  • the orthogonal reference marks X100,Y100,Z100, X200,Y200,Z200 and X300,Y300,Z300 are globally confused.
  • Each retaining lever 200 is movable, around the axis A144 of the guide shaft 144 around which the first longitudinal end 206 of its armature 202 is mounted, between a position pressed against the electromagnet, in the example pressed against the lower branch 124 of the ferromagnetic core 102, and a position remote from the electromagnet in which an empty space E of non-zero dimensions along the axes X100, Y100 and Z100 exists between the electromagnet, in the example the lower branch 124, and the lever 200.
  • the thickness of the empty space E which is measured along the Y axis, is non-zero in the remote position of the retaining lever 200 with respect to the electromagnet 100.
  • the terms "remote” and "pressed” used to define the positions of the retaining lever with respect to the electromagnet relate to the remote or pressed character of its abutment surface S204 with respect to the electromagnet.
  • the retaining lever 200 shown in the lower part of the figure 11 is in the position pressed against the electromagnet, while the lever 200 represented in the upper part of the figure 11 is in a remote position from the electromagnet.
  • the surface S204 is in contact with a lower pole surface S124, to the point that it limits the pivoting movement of the lever 200 represented in the lower part on the figure 11 , counterclockwise around the axis A144 of the guide shaft 144 on which this lever 200 is pivotally mounted.
  • the external surface of attraction S208 is not in contact but at a distance from the lower polar surface 124, in the sense that there is a transverse clearance J1 of non-zero dimension between the surfaces S208 and S124.
  • the clearance dimension J1 is measured parallel to axes Y100, Y200 and Y300.
  • the presence of clearance J1 of non-zero dimension over the entire length of surface S208 along axis X100 and over the entire thickness of surface S208 taken along axes Z100, Z200, Z300 signifies that an air gap exists between surfaces S124 and S208.
  • the abutment surface S204 projects, with respect to the external surface of attraction S208, in the direction of the electromagnet 100.
  • the surface of stop S204 protrudes transversely, in a direction parallel to axis Y200 and facing the electromagnet in the mounted configuration of the retaining lever 200, with respect to the external surface of attraction S208, and this abutment surface S204 comes into contact with the second polar surface S124 by maintaining the external surface of attraction S208 at a distance from the second pole S124 when the lever 200 pivots from its position remote from the electromagnet to its position pressed against the electromagnet.
  • the surface S208 is an external attraction surface insofar as, when the lever 200 is in its position pressed against the electromagnet 100 and when this electromagnet is activated, the magnetic attraction force between the ferromagnetic core 102 and the The metal reinforcement 202 exerts itself through this surface S208.
  • the armature 202 in particular the portion 208A of the end 208, does not extend longitudinally at the level of the entire abutment surface S204.
  • the external surface of attraction S208 is arranged longitudinally with respect to the retaining lever 200, that is to say along the axis X200, between the abutment surface S204 and the axis A210.
  • the length l8 of the external surface of attraction S208 is greater than the length l4 of the abutment surface S204 which comes opposite the lower pole surface S124 in the pressed position of the retaining lever 200 and which forms the contact zone between the surfaces S204 and S124.
  • the lengths l4 and l8 are measured parallel to the X200 axis. In the embodiment shown in figures 1 to 15 , the whole of the abutment surface S204 is facing the lower pole surface S124 in the pressed position of the retaining lever 200.
  • this surface S204 comes into contact with the lower pole surface S124 or either opposite the lower polar surface S124.
  • the length l4 of this part of the surface S204 which comes opposite the polar surface S124, which also forms a contact zone between the surfaces S204 and S124, which is chosen to be less than the length l8 .
  • l48 the length, measured parallel to the axis X200, on which the metal reinforcement 202 of the retaining lever 200 extends, starting from the end 206, beyond a line L1 which delimits the border between the surfaces S208 and S204 in a plane parallel to the plane of the figure 8 .
  • This line L1 is perpendicular to the plane of the figure 12 and makes visible, on the face of the retaining lever 200 shown in figure 8 , the junction zone Z1 between the parts 202 and 204.
  • the length l48 therefore corresponds to the length of overlap of the second longitudinal end 208 by the abutment surface S204.
  • the ratio l48/l4 is less than 0.2.
  • the abutment surface S204 covers the armature 202 on less than a fifth of the length l4 of the useful part of the abutment surface S204, which serves to support it against the electromagnet.
  • the part of the non-magnetic body 204 which constitutes the abutment surface S204, the selection beak 216, the guide ramp 218 and the pin 220 forms a lower end of the retaining lever 200 which is, essentially , devoid of metal reinforcement below the external surface of attraction.
  • the deflectors 226, 228 and 230 are engaged in reception zones Z226, Z228 and Z230 formed by the baffles 324.
  • the cooperation of the deflectors and the baffles allows to isolate certain internal parts of the unitary casing 300 equipped with the selection device 400 from the guide portion 306, which makes it possible to protect these parts against the accumulation of dust, fluff or grease.
  • a helical compression spring 340 is interposed between a central rib 342 of the housing 300 and the non-magnetic body 204 of a retaining lever 200.
  • Each spring 340 has the function of to return by default the retaining lever 200 against which it bears towards its position away from the electromagnet 100.
  • the pin 220 is engaged inside the spring 340 and makes it possible to center this spring , while the collar 222 makes it possible to accommodate the end turn of the spring all around the support pin 220.
  • Each mobile hook 13 comprises a body 502 made of plastic material and a flexible strip 504 mounted on the body 502.
  • the flexible strip which is preferably metallic, is intended to come into sliding contact against the guide ramp 218 of a lever.
  • retainer 200 and includes an orifice 508, visible in dotted lines at the figure 11 and known per se, in which the selector beak 216 of the retaining lever 200 in question can be engaged. Use can be made here of the characteristics of the mobile hook described in EP-A-1852531 or in EP-A-1413657 .
  • each body 502 is molded over one end of the cord 12 which supports the muffle 11.
  • Each body 502 defines a beak 506 for bearing on a knife 14.
  • each support beak 506 protrudes laterally from the unitary housing 300 in which is installed the mobile hook 13 to come to rest, by cooperation of shapes, on the upper face of the knife.
  • the first longitudinal end 206 is partially received in the volume V1.
  • the surface portion S206A is arranged facing the first polar surface S122 formed by the ferromagnetic core 102, these facing surfaces being in the form of a cylindrical portion with a circular base centered on the axes A122, A144 and A210 then combined. These surfaces delimit between them a play J2, radial to the axes A122, A144 and A210.
  • This radial play J2 is of non-zero thickness, this thickness being measured radially at the axes A122, A144 and A210.
  • This radial clearance J2 defines an air gap between the surfaces S122 and S206A.
  • the radial thickness of the air gap defined by clearance J2 can be between 0.1 and 0.2 millimeters (mm), preferably around 0.15 mm.
  • P144 a transverse plane parallel to the axes Y100, Y200 and Y300, on the one hand, Z100, Z200, Z300, on the other hand and perpendicular to the axes X100, X200 and X300, and containing the axes A122, A144 and A210.
  • the air gap defined by the radial clearance J2 extends around the axis A122 over an overall angular sector with an apex angle ⁇ .
  • a first part of this global angular sector is located below the transverse plane P144, on the side of the second polar surface S124 with respect to this plane, and has an apex angle ⁇ 1.
  • a second part of this global angular sector is located above the transverse plane P144, that is to say opposite the second polar surface S124, and has an apex angle ⁇ 2.
  • the sum of the angles ⁇ 1 and ⁇ 2 is equal to the angle ⁇ .
  • the angles ⁇ , ⁇ 1 and ⁇ 2 respectively represent the angular amplitudes of the global angular sector and of its first and second parts.
  • each first polar surface S122 of the electromagnet 100 extends on either side of the transverse plane P144 and comprises a first portion S122A located, with respect to this plane, on the same side as the second surface.
  • pole S124 and which has an angular amplitude ⁇ 1 as well as a second portion S122B located, with respect to this plane, opposite the second pole surface S124 and which has an angular amplitude ⁇ 2.
  • the ⁇ 1/ ⁇ ratio is between 0.2 and 0.4, preferably equal to 0.33. In this preferred case, the ratio ⁇ 1/ ⁇ 2 is equal to 0.5.
  • the good geometric precision obtained at the air gap defined between the surfaces S122 and S206A makes it possible to optimize the size of these surfaces.
  • the ratio between the diameter of the surface 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 makes it possible to discard, in the longitudinal direction parallel to the axis X100 or at the axis X300, the first and second pole surfaces S122 and S124, without penalizing the longitudinal size of the electromagnet.
  • the casing 104 is overmolded on the ferromagnetic core 102, then the winding 106 is put in place, the contacts 110 and the connecting wires are put in place. between these contacts and the winding 106 and then to the overmolding of the casing 108.
  • the electromagnet 100 thus manufactured, with its guide shafts 144, is attached and immobilized in the half-shell 302 of the unitary casing 300.
  • the introduction of the electromagnet 100 in the recess 314 takes place in a direction parallel to the axis Z300, by inserting the centering pin 146 into the centering housing 320 of the unit housing 300.
  • the centering pin 146 which is arranged between the two upper pole surfaces S122 and equidistant from them makes it possible, by fitting it into the bottom 303 of the half-shell 302 of the unit housing 300, to ensure the positioning of the electromagnet 100 in the unit housing 300, at both in direct longitudinal and transverse tions respectively parallel to the axis X300 and to the axis Y300.
  • centering notch 126 of the ferromagnetic core 102 is put in place, without play in the lateral direction parallel to the axis Y300, around the centering pin 322 of complementary shape provided on the half-shell 302.
  • the coil 106 of the electromagnet 100 is then aligned with the recess 314 made through the bottom of the case parallel to the axis Z100.
  • the carcass 104 of the electromagnet 100 then rests by plane support on two support surfaces of the bottom 303 of the half-shell 302, one disposed between the lower polar surfaces S124, the other disposed between the upper polar surfaces S122 .
  • the external peripheral surface S'142 of the sole 142 is an external radial surface in the form of a cylinder portion centered on the shaft 144 which then coincides with the axis A122.
  • each sole 142 of the electromagnet 100 is engaged in a housing 326 of the unitary casing 300, as shown in figure 14 and 15 .
  • the outer radial surface S'142 of a flange 142 then faces the corresponding rib 330 in the plane of the figure 15 , in a longitudinal direction parallel to the axes X100, X200 and X300 which is vertical and directed downwards.
  • a part of the rib 330 is therefore arranged facing the surface S'142 in the longitudinal direction.
  • a reduced longitudinal clearance J3 is defined between the outer peripheral surface S'142 and the rib 330 in the plane of the figure 15 .
  • This clearance J3 is therefore vertical and has, in practice, a non-zero thickness when the electromagnet 100 is placed in the unitary casing 300 in order to prevent this placement from generating a hyperstatic situation.
  • the thickness of clearance J3 is measured parallel to axis X300.
  • the thickness of clearance J3 is less than or equal to 0.5 mm.
  • the axes of oscillation A144 are fixed with respect to the half-shell 302 and to the electromagnet 100.
  • the free ends 144E of the guide shafts 144 extend opposite the bottom 303 of the half-shell 302.
  • the two guide shafts 144 extend with their axes A144 parallel to the axis Z300 and are perpendicular to the bottom 303 of this half-shell.
  • the retaining levers 200 are then placed around the guide shafts 144 of the carcass 104 by providing that a first longitudinal end 206 of each retaining lever 200 comes to surround a guide shaft 144.
  • the axis A210 of each retaining lever 200 is aligned with the axes A122 and A144, then the first longitudinal end 206 of the armature 202 is partially engaged in the volume V1, by an axial translation parallel to the axes A122, A144 and A210, until to come into abutment against the surface S142 of one of the soles 142. This amounts to hooking the retaining levers on the electromagnet in place in the unitary casing.
  • each external attraction surface S208 faces a lower pole surface S124 of the electromagnet 100, in the transverse direction parallel to the axes Y100, Y200 and Y300.
  • each retaining lever 200 is neither facing the first pole surface S122, nor facing the second pole surface S124 but arranged longitudinally at the level of the central branch 120 of the core 102 and of the winding 106.
  • 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, at the course of the axial translation mentioned above.
  • these retaining levers are connected to the rest of the selection device 400 and each movable in rotation about an axis A144 which is fixed relative to the unitary housing 300 since the electromagnet 100 is immobilized in the unitary housing 300.
  • the external radial surfaces S144 of the guide shafts 144 therefore form cylindrical guide surfaces which cooperate, with reduced clearance, with the retaining levers 200, more particularly with the surfaces S210 of the housings 210, in their pivoting movement around their axis. swing A144.
  • reduced play we mean a radial play at the axis of oscillation A144 strictly less than the play J2, to guarantee a non-zero air gap between the surface S206 and the first adjacent pole surface S122, and therefore the absence of contact between the armature 202 of lever 200 and pole surface S122, between the remote position and the pressed position of the retaining lever.
  • Guide surfaces S144 are formed on the non-magnetic part of the electromagnet. Each guide shaft 144 forms a point of attachment of a lever 200 to the box 300, this point of attachment being fixed with respect to the electromagnet 100.
  • the cooperation of the deflectors 228 and 230 with the zones Z228 and Z230 defined by the baffles 324 also makes it possible to isolate an attraction zone defined between, on the one hand, the lower polar surface S124 and, on the other hand, the outer surface attraction S208 and the abutment surface S204. This makes it possible to keep this attraction zone free of grease and dust to guarantee a satisfactory air gap between the lower pole surface S124 and the external surface of attraction S208 when the retaining lever 200 is in its position pressed against the electromagnet.
  • the two retaining levers 200 can then oscillate around their respective guide shafts 144, between the remote and flat positions respectively represented in the upper part and in the lower part of the figure 11 . In a manner known per se, this makes it possible to selectively retain the mobile hooks 13 in position, according to a command sent to the electromagnet 100 by the electrical contacts 110.
  • the mobile hooks 13 and the cords 12 can then be placed in the guide portion 306 of the half-shell 302. Alternatively, the mobile hooks 13 and the cords 12 are placed in the half-shell before the elements 100 and 200.
  • the free ends 144E of the guide shafts 144 protrude from the retaining levers 200, in a direction parallel to the axes Z100 , Z200 and Z300. It is then possible to cover the half-shell 302 with the cover 308, the half-shell 302 and the cover 308 being stacked along the axis Z300, by aligning the orifices 332 on the orifices 312 and the housings 336 on the free ends 144E of the guide shafts 144. Rods or fastening screws are then placed in the holes 312 and 332.
  • half-shells 302 each equipped with a selection device 400, the bottom 303 of a half-shell serving as a cover for the adjacent half-shell, and to use a cover 308 only for the last half-shell 302.
  • This configuration is partially represented in figure 14 and 15 .
  • the orifices 312 of the half-shells 302 are superimposed and fastening rods or screws are then placed in these orifices.
  • first unitary housing is formed by the first half-shell and by the bottom 303 of the second half-shell. The same is true for the other unitary boxes, except for the last one which is covered by the cover 308.
  • the recessed housing 344 is made on the side of the bottom 303 of the second half-shell 302 opposite the electromagnet 100 contained in this half-shell.
  • the bottom 346 of the hollow housing 344 of the second half-shell comes to bear against the free end 144E of the guide shaft 144, in a direction parallel to the axis Z300.
  • the cylindrical wall 348 which defines the housing 344 is substantially complementary to the outer peripheral surface S144 of the guide shaft 144, which makes it possible to center each guide shaft in the second half-shell 302 of the second unitary housing 300 .
  • the figure 14 and 15 show that the bottom of the first half-shell of the stack of unitary boxes is not equipped with a recessed housing 344, which would be useless.
  • the flat and annular surface 338 constituted by the bottom 303 of the second half-shell 302 and which surrounds the recessed housing 344 faces the sole 142 of the electromagnet received in the first half-shell.
  • the first end 206 of the armature 202 is arranged between the surfaces S142 and 338 which face each other in a direction parallel to the axis Z300.
  • the surface 338 serves as a cover for the volume V1 in which the armature 202 is partially received.
  • cover 308 is the flat and annular surface 338 of a recessed housing 336 which closes the volume V1.
  • the boxes 300 are centered with respect to each other in the longitudinal and transverse directions parallel to the axes X300 and Y300 and bear against each other in the direction of the axis Z300.
  • each electromagnet 100 selectively controls, by means of the two retaining levers 200 associated with it, the retention or release of one and the other of the two movable hooks 13 which are arranged on either side of this electromagnet in the same unit housing 300.
  • the two movable hooks 13 are shown in the vicinity of the dead center of their trajectory.
  • the mobile hook 13 visible in the upper part of the figure 11 is hooked onto the corresponding retaining lever 200, by inserting the selection beak 216 of this retaining lever into an orifice 508 of the strip 504 of this movable hook, which is possible because this retaining lever 200 is in a position away from the electromagnet 100.
  • the mobile hook 13 shown in the lower part of the figure 11 is disengaged from the selection beak 216 of the corresponding retaining lever, which is held in the flattened position, to the point that its selection beak 216 is not found on the trajectory of the upper end of the slat 504 of this mobile hook.
  • each retaining lever 200 between its position remote from the electromagnet 100 and its position pressed against this electromagnet, the upper air gap, defined by the radial clearance J2, remains identical, with a non-zero value.
  • the lower air gap defined between the external surface of attraction S208 and the lower polar surface S124 decreases until it has a non-zero thickness represented by the clearance J1 at the figure 12 .
  • the non-zero value of the lower air gap is well controlled by the fact that the surfaces S204 and S208 are both carried by the retaining lever 200 and by the bringing into contact of the abutment surface S204 against the electromagnet, in particular at its lower polar surface S124 opposite which the external surface of attraction S208 is arranged.
  • the value of the clearance J1 is chosen according to the magnetic force to be exerted on the retaining lever 200 to maintain it in the position pressed against the electromagnet 100, which depends, among other things, on the magnetic properties of the armature 202 and the stiffness constant of the spring 340.
  • the value of the clearance J1 is between 0.01 and 0.06 mm, preferably between 0.025 and 0.05 mm, more preferably around 0.04 mm.
  • the electromagnet is not energized when the lever retainer is in its position pressed between the electromagnet, the retainer lever is not held against the electromagnet and, under the effect of the elastic force exerted by the spring 340, this retainer lever pivots towards its position away from the lower pole surface S124 when the mobile hook descends with the knife.
  • the selection beak 216 engages in the orifice 508 provided in the blade 504, to retain by its surface S216 the mobile hook 13 in the high position, close to the top dead center of its trajectory, despite the lowering movement of the knife 14.
  • each retaining lever 200 is configured to interact with the pole surfaces S122 and S124 of the electromagnet 100, depending on the activation of this electromagnet, in order to control the angular position of this lever. retained with respect to the electromagnet, around its axis of oscillation A144. This makes it possible to select, that is to say to maintain in the high position, or to release, that is to say to let go down, a mobile hook 13 resting on a knife 14, at the start of its downward movement. .
  • the electromagnet 100 makes it possible to control whether or not the retaining lever 200 is maintained in the position pressed against the electromagnet.
  • a movable hook 13 has been retained by the retaining lever 200, when the corresponding knife 14 again reaches the vicinity of the position of the top dead center of its trajectory, the knife 14 again pushes back the body 502 and the strip 504 of the mobile hook upwards, the lamella comes to bear again against the guide ramp 218 to press the retaining lever against the lower pole surface S124 of the electromagnet 100, as part of the leveling.
  • the mobile hook 13 can be kept pressed against the electromagnet or not, depending on the activation of the electromagnet 100.
  • the movable hook ensures the movement of the retaining lever from its remote position to its pressed position, without pressing the retaining lever against the electromagnet, the remaining travel of the retaining lever to reach its pressed position being caused by the activation of the electromagnet (“call”).
  • a single abutment surface S204 is used which is as far as possible from the axis of oscillation A144 of the retaining lever 200, which makes it possible to reduce the length of the metal reinforcement 202 at the minimum length necessary to establish the magnetic circuit between the first and second pole surfaces.
  • the metal armature may only extend as far as the junction between the abutment surface S204 and the external attraction surface S208, which is marked by the line L1. This makes it possible to reduce the length of the armature 202, therefore the inertia of the retaining lever 200 and its cost price.
  • the first pole surfaces S122 formed by the ferromagnetic core 102 of the electromagnet 100 are arranged at the level of the lower transverse branches 122 of the core 102 located in the lower part of the electromagnet 100, while the second pole surfaces S124 are arranged at the level upper transverse branches 124 of core 102 located in the intermediate part of this electromagnet 100.
  • the second pole surfaces S124 are arranged above the first pole surfaces S122, according to a longitudinal direction of this electromagnet 100 which is parallel to the axis X100.
  • the carcass 104 of the electromagnet 100 is pierced with two positioning housings 145 intended to receive positioning members provided in the body 300 of the shedding mechanism.
  • the second polar surfaces S124 are crenellated and provided with transverse grooves 125, which extend parallel to the axis Z100 and which delimit separate bands of material between them, in a manner comparable to the grooves 224 and bands formed on the surface S204 of the first embodiment.
  • two abutment surfaces S204 are delimited on the retaining lever 200 on either side, in a longitudinal direction parallel to the axis X200, of the external surface of attraction S208 defined by the armature 202 of this lever .
  • the portion 206 of the armature 200 is defined in an intermediate zone of the lever 200.
  • the armature 202 comprises, in addition this part 206, two branches 205 and 207 which extend in opposite longitudinal directions, generally parallel to the axis X200, from this portion 206 and which respectively carry a first portion 204A and a second portion 204B of the non-magnetic body 204 of this retaining lever 200.
  • the first portion 204A defines the selector beak 216 and the guide ramp 218.
  • the second portion 204B defines the two abutment surfaces S204.
  • a spring 340 tends to push the abutment surfaces S204 away from the electromagnet 100 by default.
  • the portions 204A and 204B of the non-magnetic body 204 are not in one piece, it is possible to consider dispensing with the portion 204A.
  • the selection beak and the retaining ramp are formed directly on the frame 202 and can cooperate with a hook molded in synthetic material, as envisaged in EP-A-0823501 .
  • the guide shafts 144 are formed on the non-magnetic part of the electromagnet 100 integral with the ferromagnetic core 102 but are not integral with the non-magnetic carcass 104 of the electromagnet 100. It is thus possible to use, to constitute these shafts guide 144, a material different from that of the carcass 104 which includes the soles 142.
  • the guide shafts 144 are attached to the non-magnetic carcass 104 of the electromagnet 100 and connected inseparably with the non-magnetic carcass 104 and with the soles 142. The non-magnetic carcass 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 which is non-magnetic and whose mechanical characteristics are particularly adapted to its function such as , for example, a ceramic material or a polymer other than that of the non-magnetic carcass 104.
  • these added guide shafts are connected to the carcass 104 during the overmolding operation on the core 102.
  • the non-magnetic carcass 104 is molded by injection of a polymer material and formed prior to its assembly with the ferromagnetic core 102.
  • the non-magnetic carcass 104 defines a volume for receiving the ferromagnetic core 102, the ferromagnetic core being centered in this reception volume by means of two pins 154 which form part of the carcass 104 and which pass through two correspondingly shaped orifices 134 provided in the ferromagnetic core 102.
  • the injected carcass is in one piece and comprises two guide shafts 144 and two flanges 142 which define, by their respective surfaces S144 and S142 and with the first polar surfaces S122, volumes V1 for partially receiving the armatures of two retaining levers which may be identical to those of the first embodiment.
  • the two guide surfaces S144 are therefore formed on parts 144 of the electromagnet which are integral with each other.
  • the unitary casing 300 of this fourth embodiment defines, as in the first embodiment, a recess 314, in which the portion of the electromagnet 100 which carries the winding can be engaged, and two zones 316 for receiving the levers of detention.
  • Two housings 326 for receiving the soles 142 and the guide shafts 144 are made on either side of the recess 314, in a transverse direction of the unitary housing 300, which is parallel to an axis Y300 defined as in the first mode. of realization, within an orthogonal reference X300, Y300, Z300. For the rest, this case is comparable to that of the first embodiment, except that its geometry is adapted to that of the electromagnet 100 partially shown in figure 19 .
  • each housing 326 is defined by a flat surface 328 and by a rib 330 which surrounds a base 142 of the electromagnet 100, in the installed configuration of the electromagnet in the housing 300.
  • the electromagnet 100 When the electromagnet 100 has been wound, starting from the configuration shown in figure 19 , with the winding which winds around the intermediate part 120, in contact with the side faces 120C and 120D and around the strips 148, defined as in the first embodiment, there is placed in the casing 300, then a quantity of polymer material forming a casing 108 is placed in the casing by overmolding and partially covers the electromagnet in order to protect the winding and to immobilize, in an unremovable manner, the electromagnet 100 in the casing 300. During its overmolding in the housing 300, the casing 108 is contained so as to remain at a distance from the pole surfaces S122 and S124. This allows to reach the configuration of the figure 21 from which the retaining levers can be put in place in the box 300, by engaging the orifices provided in their respective frames around the guide shafts 144, as envisaged for the first embodiment.
  • the coil winds around the longitudinal and central branch 120, in contact with only one of the side faces 120C or 120D and around the bands 148, the carcass extending opposite, along the axis Z100, on the other among the transverse faces 120D or 120C, between the two bands 148.
  • the fact that the axis of oscillation of the retaining lever is provided at the longitudinal level of the first polar surface guarantees good control of the air gap between the armature of the mobile retaining lever and this first surface.
  • polar with a radial thickness equal to the non-zero play J2, taken radially to the axes A122, A144, whatever the position of the retaining lever between its remote position and its position pressed against the electromagnet.
  • the clearance J2 can be variable over the angular extent of the air gap between the armature and the first pole surface.
  • the abutment surface guarantees good control of the air gap with a thickness equal to the clearance J1, measured parallel to the axes Y100, Y200 and Y300, between the retaining lever and the second pole surface, when the retainer is in its position pressed against the electromagnet.
  • the abutment surface is placed on the retaining lever, rather than on the electromagnet, its position with respect to the guide ramp and the selector beak is defined with good precision, in particular a precision better than if this surface was provided on the electromagnet.
  • the fact of providing the abutment surface on the retaining lever simplifies the construction of the electromagnet, which constitutes a bulkier and more complicated part to manufacture than the retaining lever itself.
  • the formation of the soles 142 in one piece with the non-magnetic carcass 104 of the electromagnet 100 maximizes the positioning precision between the retaining lever 200 and the ferromagnetic core 102 in a direction parallel to the axes Z100, Z200 and Z300. This allows good control of the air gaps between the selection levers 200 and the electromagnet 100.
  • the fact of defining the guide surface S144 on the electromagnet 100 makes it possible to test the correct operation of the electromagnet, by means of a test retaining lever, before installing this electromagnet in the unit box 300.
  • the assembly of the electromagnet 100 on the unitary case 300 by cooperation of shapes, with a minimum clearance or without clearance, is easy to implement and compatible with the dismantling of the mechanism crowd formation.
  • the assembly of the electromagnet 100 on the unitary case 300 by cooperation of shapes, with a minimum clearance or without clearance is easy to implement and compatible with the dismantling of the mechanism crowd formation.
  • the presence of the recess 314 and the fact that the winding 106 is in direct contact with the side faces 120C and 120D of the central branch 120 of the ferromagnetic core 102 confers good compactness on each unit case 300 equipped with an electromagnet 100, in a direction parallel to the axis Z300.
  • the offset of the deflectors on each lateral side of the unitary casing induces that they form, on each transverse side of the retaining lever, a relatively long border, which improves the sealing obtained.
  • the first pole surfaces S122 are offset with respect to the second pole surfaces S124, in the longitudinal direction of the shedding mechanism. crowd which is parallel to the axes X100 and X300 which are then merged.
  • the winding extends between the first pole surfaces S122 and the second pole surfaces S124 in the longitudinal direction.
  • the guide surface formed on the electromagnet 100 and which interacts with the retaining lever 200 is a surface arranged outside this retaining lever 200, that is to say say a surface that partially surrounds this one.
  • a guide surface may be a concave surface in cylinder portion which faces a cylindrical outer radial surface of the lever 200, centered on the axis of oscillation, for example on the side opposite the core of the electromagnet 100. This is a mirror configuration from those shown in the figures.
  • the guide surface is separate from any pole surface of the electromagnet and is preferably provided on the carcass 104.
  • the radial clearance between the guide surface and the cylindrical outer radial surface of the lever is strictly less than the dimension of the air gap between the first pole surface and the facing surface of the lever.
  • the electromagnet 100 can be mounted in the unitary casing 300 in such a way that its guide shafts 144 extend, from the soles 142, in the direction of the bottom 303 of the half -shell 302 which accommodates the electromagnet 100.
  • the longitudinal ends 206 of the retaining levers 200 are then received between the soles 142 and the bottom 302 of the half-shell 302 which accommodates the electromagnet 100.
  • the free end 144E of the shaft of each guide shaft 144 then cooperates with a recessed housing, comparable to the recessed housing 344 of the first embodiment, which is formed not on a second adjacent housing but in the bottom 303 of the housing 300 in which is received electromagnet 100.
  • a centering pin comparable to the centering pin 146 is made in the unitary housing 300, while a housing of corresponding shape, comparable to the housing 320 is made on the electromagnet, preferably in its non-magnetic carcass 104. This facilitates the positioning of the electromagnet 100 in the casing 300, like the cooperation of the elements 146 and 320 in the first embodiment.
  • the axes of oscillation A144 can extend in a direction parallel to the axis Y100, and not in a direction parallel to the axis Z100.
  • the sole 142 then preferably extends in a plane parallel to the plane formed by the axes X100 and Z100.
  • a box can receive two electromagnets each defining two guide shafts, these two electromagnets being superposed in the longitudinal direction as described, for example, in EP-B-1619279 , to make it possible to reach three or four positions of the heald, which makes it possible to weave fabrics other than so-called "flat" fabrics.
  • the selection device then comprises more than two mobile hooks, these mobile hooks being integral, in pairs, with the same cord.
  • a single mobile hook 13 or more than two mobile hooks can be provided in the housing 30.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Electromagnets (AREA)
EP21216581.5A 2020-12-21 2021-12-21 Fachbildungsmechanismus und webmaschine vom typ jacquardwebmaschine, die mit einem solchen mechanismus ausgestattet ist Active EP4015687B1 (de)

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FR2013853A FR3118070B1 (fr) 2020-12-21 2020-12-21 Mecanisme de formation de la foule et metier a tisser de type jacquard

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US (1) US11702771B2 (de)
EP (1) EP4015687B1 (de)
KR (1) KR20220089672A (de)
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EP0823501A1 (de) 1996-08-06 1998-02-11 Staubli Lyon Verfahren und Vorrichtung zur Wahl der beweglichen Haken einer Fachbildungsvorrichtung sowie Jacquardwebmaschine
EP0851048A1 (de) 1996-11-29 1998-07-01 Staubli Lyon Auswahlvorrichtung, dreistand Fachbildungsmechanismus und Webmaschine mit einem solchen Fachbildungsmechanismus
EP0899367A1 (de) 1997-09-01 1999-03-03 Staubli Lyon Auswahlvorrichtung, Dreipositions- Fachbildungsmechanismus und Webmaschine mit einem solchen Fachbildungsmechanismus
EP1413657A1 (de) 2002-10-25 2004-04-28 Staubli Lyon Fachbildungsmechanismus und Webmaschinen mit einem solchen Mechanismus
EP1619279A1 (de) 2004-07-19 2006-01-25 Staubli Lyon Fachbildemechanismus, Dreipositions-Fachbildemechanismus und Webmaschine mit einem solchen Fachbildungsmechanismus
EP1852531A1 (de) 2006-05-03 2007-11-07 Staubli Lyon Mechanismus zur Bildung von gewalktem Gewebe, mit einem solchen Mechanismus ausgestattete Webmaschine und Verfahren zur Auswahl der beweglichen Platine eines solchen Mechanismus

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Publication number Priority date Publication date Assignee Title
EP0823501A1 (de) 1996-08-06 1998-02-11 Staubli Lyon Verfahren und Vorrichtung zur Wahl der beweglichen Haken einer Fachbildungsvorrichtung sowie Jacquardwebmaschine
EP0851048A1 (de) 1996-11-29 1998-07-01 Staubli Lyon Auswahlvorrichtung, dreistand Fachbildungsmechanismus und Webmaschine mit einem solchen Fachbildungsmechanismus
EP0899367A1 (de) 1997-09-01 1999-03-03 Staubli Lyon Auswahlvorrichtung, Dreipositions- Fachbildungsmechanismus und Webmaschine mit einem solchen Fachbildungsmechanismus
EP1413657A1 (de) 2002-10-25 2004-04-28 Staubli Lyon Fachbildungsmechanismus und Webmaschinen mit einem solchen Mechanismus
EP1619279A1 (de) 2004-07-19 2006-01-25 Staubli Lyon Fachbildemechanismus, Dreipositions-Fachbildemechanismus und Webmaschine mit einem solchen Fachbildungsmechanismus
EP1619279B1 (de) 2004-07-19 2008-02-27 Staubli Lyon Fachbildemechanismus, Dreipositions-Fachbildemechanismus und Webmaschine mit einem solchen Fachbildungsmechanismus
EP1852531A1 (de) 2006-05-03 2007-11-07 Staubli Lyon Mechanismus zur Bildung von gewalktem Gewebe, mit einem solchen Mechanismus ausgestattete Webmaschine und Verfahren zur Auswahl der beweglichen Platine eines solchen Mechanismus

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CN114645362A (zh) 2022-06-21
FR3118070A1 (fr) 2022-06-24
EP4015687B1 (de) 2023-10-18
TW202233922A (zh) 2022-09-01
US11702771B2 (en) 2023-07-18
FR3118070B1 (fr) 2022-12-23
KR20220089672A (ko) 2022-06-28
PT4015687T (pt) 2023-10-30
US20220195641A1 (en) 2022-06-23

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