Classifications

• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
  • D04C5/00—Twist or bobbin-net lace-making machines
  • D04C5/16—Warp thread feeding or guiding devices
  • D04C5/18—Guide bars; Guiding means therefor; Pattern input by control thereof
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B27/00—Details of, or auxiliary devices incorporated in, warp knitting machines, restricted to machines of this kind
  • D04B27/10—Devices for supplying, feeding, or guiding threads to needles
  • D04B27/24—Thread guide bar assemblies
  • D04B27/32—Thread guide bar assemblies with independently-movable thread guides controlled by Jacquard mechanisms
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/16—Rectilinearly-movable armatures
  • H01F7/1607—Armatures entering the winding
  • H01F7/1615—Armatures or stationary parts of magnetic circuit having permanent magnet

Definitions

• the present invention relates to an electromagnetic device for the automated actuation of the needles of a Jacquard machine, as well as a Jacquard machine equipped with such a device. It relates more specifically to a device intended to be moved relative to the needles. Jacquard mechanics, in order to push them selectively, according to a selection established automatically at each cycle of the Jacquard mechanics, by the control of electromagnetic means
• the invention finds more particularly, but not exclusively, its application in the replacement of perforated cartons of Jacquard looms used to order lace looms, and in particular Leavers lace looms
• the selection rod of each solenoid is associated with a passage, and has the function of closing this passage when it is brought into the extended position
• the needles of the Jacquard mechanism When the device comes into contact with the needles of the Jacquard mechanism, all the needles which are located respectively with passages closed by a selection rod are pushed by the device during its movement.
• the needles of the Jacquard mechanism located opposite these free passages penetrate inside said passages when the device is moving, and are therefore not pushed by this last.
• the selection rods act respectively on intermediate pushers, and have the function of locking them in the extended position.
• the present invention aims to provide an electromagnetic device which has the advantages of the devices of the aforementioned European patent application, but which is composed of electromagnetic selection members having a smaller footprint, so that it can be adapted to the control of the needles of a Jacquard mechanism arranged in successive tight rows.
• the device of the invention finds more particularly its application to the Jacquard mechanics used for the control of Leavers lace looms, and for which the spacing between two successive rows of needles is very small, and of the order of 6mm.
• the invention is however not limited to this particular type of Jacquard mechanism, but can be applied in general to any type of Jacquard mechanism, controlled by needles which have to be pushed selectively, and arranged in successive rows.
• Jacquard ropes or hooks for controlling textile looms, and in particular weaving looms. It may also be jacquard looms of the type described in French patent application FR-A-2 704 562, the needles of which have to be pushed, and the so-called drop needles, control the movement of flexible so-called percussion needles. arranged transversely to the falling needles. Finally, the needles of the Jacquard mechanics having to be pushed selectively by the device of the invention may be arranged vertically or horizontally.
• the device of the invention on the one hand is intended to be moved at each cycle of the Jacquard mechanism relative to the needles, in view to push them individually selectively, and on the other hand implements for each needle a selection member which is movable in a direction transverse to the direction of thrust of the device between a first selection position and a second withdrawal position, and whose movement between the two selection and withdrawal positions can be controlled electromagnetically, so that during its movement the device pushes only the needles of the Jacquard mechanism which are associated with a selection member in the selection position.
• the needles of the Jacquard mechanism being arranged in parallel rows
• the device comprises a plurality of parallel plates, spaced two by two with a spacing identical to that separating two successive rows of needles; in the space between two successive plates, on the one hand are mounted the selection members associated with the needles of the same row, which selection members are movable in the same plane parallel to that of the plates, and on the other hand is provided, for each selection member, an electromagnetic circuit in two parts, making it possible to create at least one induced electromagnetic field oriented transversely to the plane of the plates, the two parts of the electromagnetic circuit being mounted respectively on the opposite faces of these two plates and consisting respectively of a main part wound with at least two opposite electromagnetic pole ends, and an armature for closing the electromagnetic field disposed opposite the main part wound; each selection member further comprises a magnetized part which is positioned between the two parts of the associated electromagnetic circuit, so as to allow the control of its movement.
• each plate is equipped on each of its two faces either exclusively of wound parts, or exclusively of frames for closing the electromagnetic field.
• all the plates will be of the same type, and each plate has on one of its faces the wound parts of the electromagnetic circuits, and on its other face the closing armatures which are intended to respectively close each electromagnetic field induced wound parts of the adjacent plate.
• This variant has the advantage of reducing manufacturing costs, because all the plates are identical.
• the wound parts and the closing plates of a plate can be separated, and for example bonded respectively to the two faces of each plate.
• each closing frame of a plate is preferably constituted by the base of a ferromagnetic carcass, the part of which opposite the base is wound, and which is fixed through the plate, so that the base and the wound part of the carcass are respectively on each side of the plate.
• the device comprises between each plate, and for each selection member, a separate pusher, which is movable relative to the plates, in the plane of the plates and in a direction transverse to the axis of movement of the selection members, and which can be locked in the extended position relative to the plates, by the associated selection member, position in which the pusher can push the associated needle of the Jacquard mechanism when the device is moving.
• each pusher can be placed in the extended position relative to the plates and the selection members by any suitable means, in order to be locked if necessary in this position.
• This can be obtained in a first variant by moving the assembly formed by the parallel plates and the selection members relative to the pushers.
• the device comprises a rearming plate, and the assembly formed by the parallel plates and the selection members is movable in translation relative to the rearming plate, along the axis of the pushers, between a first position in which all of the pushers are in contact with the reset plate and in the extended position, and a second position in which only the pushers locked in the extended position relative to the plates are brought into contact with the corresponding needles of the Jacquard mechanism, the non-locked pushers in the extended position are not driven and remain in contact with the reset plate.
• the device of the The invention comprises, in a second variant, a rearming plate which is movable in translation relative to the plates and the selection members, and along the axis of the pushers, and which has the function at each cycle of the Jacquard mechanics bring and keep the pushers in the extended position relative to the plates, while controlling the movement of the selection members
• the rearming plate according to the invention can generally be used in any device which makes it possible to automatically and selectively push needles of a Jacquard mechanism, by means of pushers which can be locked in the extended position by means of selection members
• This additional characteristic of the invention is therefore independent of the implementation of the main means of the invention, that is to say the particular structure in several parallel plates, with for each space between plates, a plurality of electromagnetic circuits in two parts, making it possible to each create at least one induced electromagnetic field oriented transversely to the plane of the plates, for controlling the movement of each member for selecting the needles of the same row
• this plate can be fitted to the variant of FIG.
• a Figure 1 is a partial top view of a device of the invention for the automatic selection of falling needles of a Jacquard machine, arranged in parallel rows, at the rate of eight needles per row,
• FIG. 2 is a sectional view along a vertical plane of the device of Figure 1 between two successive plates
• FIG. 3 is a sectional view along a horizontal plane of the device of Figure 1, located at a selection device between two successive plates.
• the device of Figures 1 to 3 is intended to be mounted on a Jacquard mechanism (not shown) with falling needles 1, more commonly called droppers, such as those used for the control of a Leavers lace loom. It replaces the rotary cylinder serving as a support and allowing to drain the perforated cardboard boxes traditionally used to selectively push the needles of Jacquard mechanics.
• the needles 1 of the Jacquard mechanism are arranged in a plurality of successive rows spaced at a constant spacing e, and each comprising eight needles.
• the device comprises a plurality of identical parallel plates 2, which are regularly spaced at a spacing e identical to that of the rows of needles of the Jacquard mechanism, and which are integral with a perforated guide plate 3.
• the plates 2 are vertical, while the perforated guide plate 3 is horizontal. More generally, the perforated guide plate 3 will be oriented in a plane transverse to the needles 1 of the Jacquard machine, and the plates 2 will be oriented along a plane parallel to the plane of the needles.
• Each perforation 3a of the guide plate 3 is intended to come opposite a needle 1 of the Jacquard mechanism.
• these perforations are therefore arranged in a plurality of successive rows 4, at the rate of eight perforations 3a per row, each row 4 of perforations 3a corresponding to a row of needles 1 of the Jacquard mechanism
• the vertical plates 2 are arranged relative to the guide plate 3 of such so that a row 4 of perforations 3a is located between two successive plates 2 In FIG. 1, a limited number of rows 4 has been shown.
• a Jacquard machine may comprise more than a hundred rows of needles
• Eight vertical pushers 5 are inserted between each plate 2 at the rate of one pushbutton 5 per needle 1 in the same row
• the pushers 5 positioned between two plates 2 are each slidably mounted in the same plane 5a parallel to the plates 2, between a position retracted with respect to the plates 2, hereinafter called the low position, and an extended position with respect to the plates 2, hereinafter called the high position, and are guided in translation by two supports 6a and 6b, which allow each pusher to be blocked horizontally 5
• the device is positioned relative to the needles of the Jacquard mechanism in a so-called thrust position, which is such that each pusher 5 is plumb with a needle 1
• the device can be driven in a translational movement relative to needles 1 in a direction called thrust, which is symbolized by the double arrow D, and which is in this case vertical
• thrust which is symbolized by the double arrow D, and which is in this case vertical
• the pushers 5 which are in the high position come into contact with the corresponding needles 1, via their upper end 5d, called the pushing end.
• the device in its pushing position, when the device moves vertically upwards alone the needles 1 associated with a pusher 5 in the high position are raised by the device during its movement
• the device can either be constantly in its thrust position, and have a single translational movement relative to the needles, or be animated, with each cycle of the Jacquard mechanism, in addition to the translational movement in the thrust direction, a movement allowing it to be brought into its thrust position.
• each space delimited by two successive plates 2 are mounted eight selection members 7 which are positioned in the same plane 7a parallel to the plates 2, that is to say in this case in the same vertical plane.
• Each selection member 7 is associated with a pusher 5 and can slide horizontally under the action of electromagnetic means which will be described later, between a selection position in which the corresponding pusher 5 is locked in the high position, and a withdrawal position in which the pusher 5 is no longer locked in the high position and falls under the effect of gravity in the low position.
• the eight selection members 7 are divided into two groups of four on either side of the pushers 5.
• the four selection members 7 of the same group are guided for their sliding by two supports 8a and 8b, which allow each selection member to be blocked vertically 7.
• the weight of this needle is taken up by the supports 8a and 8b.
• each selection member consists of a flat tongue 9 of small thickness, having a substantially rectangular shape.
• the plane 7a of the selection tabs 9 between two plates 1 is offset from the plane 5a of the pushers 5, so that the pushers 5 can not prevent the horizontal sliding of the tabs selection 9.
• the end 9a of each tongue 9 ends with a lateral lug 10 which is oriented transversely to the plane of the tongue, so as to come to cut the plane 5a of the pushers 5.
• a notch 5b which in this case has the shape of a U.
• the notch 5b of a given pusher 5 is provided so that once the pusher 5 in the high position, it is located at the same level and in the extension of the tongue 9.
• a pusher 5 is brought into the high position
• its lateral lug 10 is introduced into the notch 5a of the corresponding pusher 5, and allows this pusher 5 to be blocked vertically in the high position.
• the lug 10 is released from the notch 5b of the corresponding pusher 5, by horizontally sliding the tab 9 in the opposite direction, which corresponds to the position of the lug 10 in dotted lines in FIG. 3, the pusher 5 is no longer held vertically and falls into the low position.
• each plate 2 is equipped with eight soft iron carcasses 11, comprising a base 12 and three lateral legs substantially forming an E with the base 12, namely two end tabs 13a and a central tab 13b.
• On the central leg 13b is wound a coil 14.
• the two end legs 13a thus constitute two electromagnetic polar ends of the same sign, and the central leg 13b constitutes a wound core forming an electromagnetic polar end of sign opposite to the end poles 13a.
• the signs of the end poles 13a and of the central pole 13b will be fixed by the direction of the current in the coil 14.
• Each carcass 11 is fixed through the plate 2 in an opening provided for this purpose, so that the base 12 is positioned on the face 2a of the plate 2, and the poles 13a and 13b are positioned on the other face 2b of the plate 2.
• the poles 13a and 13b of a wound carcass 1 1 of a given plate 2 are are located opposite the base 12 of the carcass 11 of the plate which is adjacent to it (upper plate in FIG. 3), and thus constitute with this base 12 an electromagnetic circuit making it possible to locally create, in the space between plates 2, two opposite induced electromagnetic fields C1 and C2.
• Each selection tab 9 is equipped with two permanent magnets 15a and 15b mounted in opposition. Each pair of magnets 15a and 15b of a selection tab 9 is positioned between the base 12 and the three poles 13a, 13b of a given electromagnetic circuit.
• FIG. 2 for the sake of clarity, only the coils 14 of each electromagnetic circuit have been shown diagrammatically in dotted lines, the carcasses 11 of the plates 2 not having been shown.
• the electromagnetic circuits are divided into two groups of four circuits, on each side of the pushers 5, and the circuits of the same group are offset laterally in the plane of the plate, which makes it possible to gain space in height. This same offset is of course found for the pairs of magnets 15a and 15b of the tongues 9 of the same group.
• the two magnets 15a and 15b of a tongue 9 constitute a bipole whose dimensions are such that it can channel its magnetic field on one or the other of the end poles 13a, depending on the direction of the two electromagnetic fields.
• armatures C1 and C2 that is to say as a function of the direction of the current imposed in the coil 14.
• the bipole constituted by the two magnets 15a and 15b of the tongue 9 tends to come and channel its field magnetic on the right end pole 13a of the wound carcass 1 1 of the bottom plate 2, the tongue 9 thus undergoing a force tending to make it move to the right
• a first indexing stop 16 is provided at the end 9a of tongue 9 and makes it possible to maintain the tongue in a stable manner in this position, which corresponds to its selection position, the lug 10 being introduced into the notch 5b of the pusher 5
• the bipole formed by the two magnets 15a and 15b seeks to come channel its magnetic field on the end pole 13a on the left, which causes the displacement of the selection tab 9 to the left
• a second indexing stop 17 ( Figure 2)
• the tongue 9 is therefore brought into a stable position against this stop 17 (pos ⁇ t ⁇ on in dotted lines in Figure 3), which position corresponds to the re position line of the selection tab, the lug 10 being released from the notch 5b of the pusher 5
• the two indexing stops 16 and 17 have the function of preventing the bipole formed by the two magnets 15a and 15b from advancing until '' at a position where it would be centered on the corresponding end pole 13a
• FIG. 3 The particular variant illustrated in FIG. 3, and using three electromagnetic pole ends 13a, 13b, a pair of magnets 15a, 15b, mounted in opposition, and two indexing stops 16 and 17, advantageously makes it possible to obtain a selection member 7 which remains stable in its withdrawal position or in its selection position, even in the event of a power cut in the coil 14
• the bipole formed p the two magnets 15a and 15b, by its magnetic field seeks w. come to center on the corresponding polar end 13a, that is to say in FIG.
• each plate 2 is equipped with a connector 18 with nine terminals 19, and serves as a support for a printed circuit 20 making it possible to connect one of the two ends of each coil 14 to the same terminal 19 acting as common ground, and the other end of each coil 14 to a terminal 19 given Terminals 19 of conn ector 18 of each plate 2 are connected to a processing unit (not shown) which is programmed so as to deliver at each cycle of the Jacquard mechanism the desired control voltage for each coil 14, depending on whether the corresponding tab 9 has to lock or not in the high position, the corresponding pusher 5, which amounts to simulating respectively a full or a hole of a perforated cardboard
• all the pushers 5 consist of rods of the same length, the lower end of which 5c, said cocking end, projects relative to the lower edge of the row of plates 2, at least when the pusher 5 is in the low position
• the rearming plate 21 is positioned so that when it is in position low, the resetting ends 5c of the pushers 5 which are in the low position come into contact with the upper face of the plate 21
• the rearming plate 21 advantageously has a low inertia, and therefore allows movements having a high frequency with a relatively large amplitude
• the main advantage of the invention lies in the fact that it makes it possible to produce a device whose spacing e between two successive plates can be very small, and is moreover independent of the number of needles per row of Jacquard mechanics. It was in particular possible to produce a device according to FIGS. 1 to 3 enabling the needles to be controlled
• Another advantage of the invention lies in its modular appearance.
• the invention is not limited to the preferred variant of embodiment which has been determined with reference to FIGS. 1 to 3.
• the device of the invention may be produced according to the variants below.
• each electromagnetic circuit creates a single induced electromagnetic field and each selection member will comprise a single permanent magnet.
• each selection member also comprises an elastic return means, for example a helical spring, which is compressed when the selection member is held in the abutment position by the electromagnetic means. When the current is cut in the coil 14, the elastic return means returns the selection member in the opposite direction to its withdrawal or selection position as appropriate.
• the axis 5e of the pushers 5 may be horizontal.
• the pushers can no longer fall back into the retracted position under the effect of gravity.
• each pusher will therefore be equipped with an elastic return means, of the helical spring type, which is compressed when the pusher is in its extended position, and which has the function of returning the pusher to the retracted position by relaxing , when the button is no longer selected and the reset plate leaves its position for holding the buttons in the extended position.
• each selection member will be designed to close off the corresponding orifice 3a of the guide plate 3.
• the selection members will consist, for example, of flat L-shaped tongues.
• the rearming plate 21 pushes each pusher 5 via its cocking end 5c which is opposite to its pushing end 5d, and which projects from the plates 2
• the rearming plate can therefore advantageously consist of a simple solid plate of small thickness.
• the rearming plate may be a perforated plate, through which the thrust ends have passed.
• each pushbutton will for example be provided at its pushing end with a flange This flange will have the function of cooperating with the rearming plate to bring the pusher into the extended position
• each selection member 7 may be designed so as to come to block in position exit push button 5 corresponding to its reset end, similar to the variant in figure
• the pushers 5 are placed in the extended position relative to the plates 2, not by translating the rearming plate 21 in the direction of the pushers, but on the contrary by a translation relative to the rearming plate 21 of the assembly formed by the plates 2 and the selection members 7, along the axis 5e of the pushers 5
• the plate assembly 2 - selection members 7 Prior to controlling the movement of the selection members 7, the plate assembly 2 - selection members 7 is brought in the direction of the reset plate 21, in a first position in which all of the pushers 5 are in contact with the rearming plate During this movement, the pushers
• the pushers 5 locked in the extended position are driven by this assembly, to a second position in which the pushers 5 locked in the extended position come into contact with the corresponding needles of the Jacquard mechanism.
• the pushers 5 not locked relative to the plates 2 remain stationary, in contact with the rearming plate 21, the assembly (plates 2 - selection members 7 - pushers 5 locked in the output position) sliding relative to the pushers 5 not locked .

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Power Engineering (AREA)
• Knitting Machines (AREA)
• Looms (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9490616

Family Applications (1)

Country Status (14)

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Family Cites Families (6)

• 1996
  • 1996-03-22 FR FR9603834A patent/FR2746422B1/fr not_active Expired - Fee Related
• 1997
  • 1997-03-12 ES ES97914377T patent/ES2148950T3/es not_active Expired - Lifetime
  • 1997-03-12 JP JP53406697A patent/JP4194657B2/ja not_active Expired - Fee Related
  • 1997-03-12 BR BR9708326-7A patent/BR9708326A/pt not_active IP Right Cessation
  • 1997-03-12 WO PCT/FR1997/000437 patent/WO1997036033A1/fr not_active Ceased
  • 1997-03-12 AT AT97914377T patent/ATE193342T1/de not_active IP Right Cessation
  • 1997-03-12 PT PT97914377T patent/PT889980E/pt unknown
  • 1997-03-12 EP EP97914377A patent/EP0889980B1/de not_active Expired - Lifetime
  • 1997-03-12 CN CN97193906A patent/CN1070941C/zh not_active Expired - Fee Related
  • 1997-03-12 AU AU21643/97A patent/AU2164397A/en not_active Abandoned
  • 1997-03-12 DE DE69702128T patent/DE69702128T2/de not_active Expired - Fee Related
  • 1997-03-12 US US09/155,068 patent/US6105628A/en not_active Expired - Fee Related
  • 1997-03-20 AR ARP970101102A patent/AR006322A1/es active IP Right Grant
• 2000
  • 2000-08-07 GR GR20000401834T patent/GR3034139T3/el not_active IP Right Cessation

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