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EP0386017B1 - Method for feeding fibres to a fibre cutting machine, and fibre cutting machine for implementing such method - Google Patents

Method for feeding fibres to a fibre cutting machine, and fibre cutting machine for implementing such method Download PDF

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Publication number
EP0386017B1
EP0386017B1 EP19880908120 EP88908120A EP0386017B1 EP 0386017 B1 EP0386017 B1 EP 0386017B1 EP 19880908120 EP19880908120 EP 19880908120 EP 88908120 A EP88908120 A EP 88908120A EP 0386017 B1 EP0386017 B1 EP 0386017B1
Authority
EP
European Patent Office
Prior art keywords
ribbon
movable
support
fixed
knife
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19880908120
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German (de)
French (fr)
Other versions
EP0386017A1 (en
Inventor
Hubert Pierret
Gabriel Léon Pierret
Maurice Jean Pierret
Jean-Marie Michel Pierret
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Individual
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Individual
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Publication date
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Priority to AT88908120T priority Critical patent/ATE81875T1/en
Publication of EP0386017A1 publication Critical patent/EP0386017A1/en
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Publication of EP0386017B1 publication Critical patent/EP0386017B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G1/00—Severing continuous filaments or long fibres, e.g. stapling
    • D01G1/02—Severing continuous filaments or long fibres, e.g. stapling to form staple fibres not delivered in strand form
    • D01G1/04—Severing continuous filaments or long fibres, e.g. stapling to form staple fibres not delivered in strand form by cutting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S83/00—Cutting
    • Y10S83/913—Filament to staple fiber cutting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/444—Tool engages work during dwell of intermittent workfeed
    • Y10T83/463—Work-feed element contacts and moves with work

Definitions

  • the present invention relates to a method for entraining fibers in the direction of the fixed and mobile knives of a fiber cutter, in particular a flock cutter.
  • the fibers are entrained in the direction of the knives by pinching between smooth cylinders driven in rotation about axes extending transversely to the direction of movement of the fibers, the latter being immobilized temporarily, always by pinching and in upstream of the knives, at the time of cutting (see FR-A- 1 457 318).
  • This procedure has the drawback of not ensuring regular entrainment of the fibers because, on the one hand, they are only pinched by the cylinders in the vicinity of their generatrices which face each other and that a sliding of the fibers with respect to the smooth cylinders is inevitable, and, on the other hand, that the mattress or ribbon formed by the fibers to be driven is free along its lateral edges. If these irregularities in the entrainment of fibers is of relative importance in fiber cutters cutting the latter into sections of considerable length, they become unacceptable in floc cutters, where the length of the sections of cut fibers is almost always less. to mm.
  • the object of the invention is to remedy this drawback and to provide a process which allows, which is particularly advantageous for flock cutters, an extremely precise entrainment of the fibers without any slipping of these fibers with respect to the others, over the entire section of the ribbon or fiber mat, so that the cut sections have the same length which remains constant during cutting.
  • this method consists in preparing a fiber mat which is aligned in a direction substantially perpendicular to the vertical plane passing through the edge of the fixed knife so that this mattress is in the form of a ribbon, to ensure the step-by-step transport of the ribbon to the knives by supporting said ribbon in the vicinity of the fixed knife, so that its lower face and its lateral faces are each supported by a flat surface whose dimension, taken parallel to the direction aforementioned, is important compared to the length of the sections of fibers to be cut, which is at least of the order of 0.1 mm, the transport step by step and the cutting being carried out, by temporarily immobilizing the ribbon relative to the the aforementioned surfaces and by causing an alternating movement of said surfaces supporting the ribbon in the above-mentioned direction and the amplitude of which is equal to a pitch which corresponds to the length of the fiber sections to be cut, according to the following cycle and considering the movable knife away from the ribbon and the surfaces supporting the latter in their position furthest from the fixed
  • the movement of the surfaces is controlled, in synchronism with the movable knife and from the drive thereof. above, immobilization of the tape relative to these surfaces as well as immobilization of the tape in the aforementioned area.
  • the supports of the fixed and movable cutter blades of the cutter are cooled, preferably permanently, and supports which have large contact surfaces with the blades are chosen.
  • the invention also relates to a cutter, for implementing the above process.
  • this cutter comprises a fixed knife arranged on a removable support, a mobile knife arranged on a removable support, a substantially horizontal fixed support, on which the fiber ribbon rests and which is located substantially at the same level that the edge of the fixed knife of the cutter, a movable support, the section of which, by a plane perpendicular to the longitudinal axis of the ribbon, is U-shaped and whose internal faces constitute the aforementioned surfaces which support the face lower and the lateral faces of the ribbon, arranged in the extension of the end of the fixed support closest to the fixed knife and substantially at the same level as the edge of the latter, a flat, rigid and movable sheet, located at a level higher than that of the movable support, substantially parallel to the core of the U and the surface of which is at most slightly less than the surface of the core of the U so that said sheet can move, substantially parallel to itself between the wings of the U formed by the movable support, the ribbon being located between the core of the U and the sheet, a clamp located between the movable
  • Figures 1 to 7 are schematic elevational views showing the successive phases of the process during a cutting cycle.
  • Figure 8 is a schematic view, in elevation, showing a cutter for the implementation of the above method.
  • FIG. 9 is a partial view, similar to FIG. 8, showing a variant of the cutter illustrated in said FIG. 8.
  • FIG. 10 is a perspective view, partially broken, showing details of the cutter illustrated in FIG. 9.
  • Figure 11 is a partial view showing a detail of the above clamp.
  • the method according to the invention is intended for entraining fibers in the direction of the fixed knives 1 and mobile 2 of a fiber cutter, in particular a flock cutter, and it consists first of all in preparing a mattress of fibers 3 which are aligned in a direction substantially perpendicular to the vertical plane, of trace 4, passing through the edge 5 of the fixed knife 1 so that this mattress is in the form of a ribbon 6.
  • the transport of the ribbon to the knives is carried out step by step by step by supporting said ribbon, in the vicinity of the fixed knife 1, so that its lower face 7 and its lateral faces 8 are each supported by a flat surface 9 whose dimension, taken parallel to the aforementioned direction is important relative to the length of the sections 10 of fibers to be cut, which is at least of the order of 0.1 mm.
  • Said step-by-step transport and the cutting are carried out, by temporarily immobilizing the ribbon 6 relative to the surfaces 9 to avoid any sliding of the fibers 3 of the ribbon on each other during transport and by causing an alternating movement of the surfaces 9 supporting the ribbon in the above-mentioned direction and the amplitude of which is equal to a pitch which corresponds to the length of the sections 10 of fibers to be cut, according to the cycle defined below and considering, as the starting phase, the movable knife 2 away from ribbon 6 and the surfaces 9 supporting the latter in their position furthest from the fixed knife 1 (see FIG. 1): temporary immobilization of the tape 6 (see FIG.
  • the ribbon 6 is immobilized with respect to the surfaces 9 by exerting a pressure regularly distributed over the upper surface 29 of the said ribbon, while the immobilization of the ribbon in the aforesaid zone 12 is carried out by pinching the latter.
  • the method according to the invention providing for the adjustment of the amplitude of the reciprocating movement of the aforesaid surfaces 9 as a function of the length of the fibers to be cut as well as the adjustment of on the one hand, the immobilization of said ribbon 6 relative to the surfaces 9 and, on the other hand, the immobilization of the ribbon 6 in the zone 12 as a function of the thickness of this ribbon, thickness which is kept substantially constant .
  • the ribbon 6 is prepared so that its width corresponds substantially to the distance which separates the above-mentioned surfaces 9 intended to support its lateral faces 8.
  • the above-mentioned distance separating these surfaces 9 is chosen to be slightly less than the length knives 1 and 2.
  • the reciprocating movement of surfaces 9 advancing step by step the ribbon 6 in the cutter, the temporary immobilization of the ribbon 6 relative to said surfaces 9 as well as the temporary immobilization of the ribbon 6 in the zone 12 are controlled from the drive of the movable knife 2, in synchronism with the latter.
  • the method according to the invention provides for permanent cooling of the supports 13 and 14 of the expensive fixed 1 and movable 2 supports which are chosen so that they have large contact surfaces with said knives.
  • the fiber cutter for implementing the above-mentioned process and illustrated diagrammatically in the drawings comprises a fixed knife 1 and a movable knife 2 which are removably mounted respectively on a support 13 and a support 14, a fixed support 15 substantially horizontal, on which the ribbon 6 of fibers to be cut rests and on which these fibers are advantageously aligned so that they extend substantially parallel to the direction of movement of the ribbon in the cutter, and which is located substantially at the same level as the edge 5 of the fixed knife 1 of the cutter, a movable support 16, the cross section of which, by a plane perpendicular to the longitudinal axis of the ribbon 6, is U-shaped and the internal faces of which constitute the aforementioned surfaces 9 which support the face lower 7 and the lateral faces 8 of the ribbon, arranged in the extension of the end of the fixed support 15 closest to the fixed knife 1 and substantially at the same level as the ridge 5 of the latter.
  • the cutter also comprises, to temporarily immobilize the ribbon 6 relative to the mobile support 16, a flat sheet 17, rigid and mobile, located at a level above the level of the mobile support 16, substantially parallel to the web of the U and whose surface is at most slightly less than the surface of the core 18 of the U so that said sheet 17 can move, substantially parallel to itself between the wings 19 of the U formed by the movable support 16, the latter forming with the sheet 17 a conduit in which the ribbon 6 is disposed.
  • Said cutter also comprises, in the aforementioned zone 12, a clamp 20 located between the movable support 16 and the knife fixed 1, which consists of two jaws 21 and 22 which are parallel and which extend transversely to the longitudinal axis of the ribbon 6 of fibers.
  • the jaw 21 is fixed and disposed substantially at the same level as the edge 5 of the fixed knife 1, while the jaw 22 is movable in a direction substantially parallel to the vertical plane, of trace 4, aforesaid, the ribbon 6 being located between these two jaws 21 and 22.
  • the cutter also comprises means 23, such as a motor 24 driving a connecting rod-crank system 25, for driving the movable knife 2 continuously so that it cooperates with the fixed knife 1 in a cyclic movement.
  • the latter comprises means 26 for animating the mobile support 16 with an alternating movement in a direction substantially parallel to the longitudinal axis of the ribbon 6, while the temporary immobilization of this with respect to the surfaces 9 and in the area 12 is obtained by means 27 arranged to reciprocate animate the movable sheet 17 along, on the one hand, a direction perpendicular to the longitudinal axis of the ribbon 6 and, on the other hand, a direction substantially parallel to said axis, and by means 28 arranged to reciprocate animate the movable jaw 22 of the clamp 20 in a direction substantially perpendicular to the longitudinal axis of the tape 6
  • the means 26, 27 and 28 respectively animating the movable support 16, the movable plate 17 and the movable jaw 22 of the clamp 20 are advantageously synchronized with the drive means 23 of the movable knife 2 and between seniors from these means 23.
  • These means 26, 27 and 28 are further arranged so that, during a cycle of the movable knife 2, that is to say between each passage of said movable knife in Regarding the fixed knife 1, the mobile support 16 is driven to make a back-and-forth movement between two extreme positions, a second position in which it is close to the fixed knife 1 and in which it could, in the case of a low-speed cutter, be kept stationary during the cutting of the ribbon 6 and a first position in which it is distant from the stationary knife 1, the distance separating these two extreme positions being equal to the length of the sections 10 of fibers to be cut.
  • These means 26, 27 and 28 are further arranged so that, on the one hand, the movable plate 17 accompanies the movable support 16 in its movement when it passes from its first position to its second extreme position while being resting on the upper face 29 of the ribbon 6 and, on the other hand, accompanies the mobile support when it passes from its second position to its first extreme position while being spaced from the upper face 29 of the ribbon and so that that the movable jaw 22 of the clamp 20 is, on the one hand, in abutment on the upper face 29 of the ribbon as soon as the movable support 16 reaches its second extreme position, during the possible immobilization of the movable support 16 in this second position extreme and while the movable support passes from its second to its first extreme position with the movable sheet 17 spaced from the upper face 29 of the ribbon and, on the other hand, is spaced from the upper face 29 of the ribbon as soon as the support m obile 16 occupies its first extreme position and as soon as the sheet 17 is in abutment on the upper
  • the fiber cutter according to the invention comprises means 30 for adjusting the amplitude of the reciprocating movement of the mobile support 16 as a function of the length of the sections 10 of fibers to be cut.
  • These means 30, which are arranged to keep the amplitude of this reciprocating movement constant when it has been adjusted, comprise, on the one hand, a fixed stop 31 (see FIG.
  • the means 30 for adjusting the amplitude of the reciprocating movement of the movable support 16 comprise two levers 37 articulated on the support 16 symmetrically with respect to the longitudinal axis of the ribbon 6 , two fixed stops 32, each cooperating with a lever 37 and of adjustable position as a function of the length of the fiber sections 10 to be cut, against which the levers 37 are applied by springs 57 as well as two cams 56 acting on these levers 37 the stops 32 and the cams 56 are located on either side of the levers 37 and these stops 32 are located between the articulations 58 of the levers 37 on the support 16 and said cams 56.
  • Springs 60 are provided to hold the levers 37 constantly applied against the cams 56.
  • Each of the fixed stops 32 is advantageously constituted by a roller whose axis is carried by an arm 59 which can move, to adjust the position of the roller, in a vertical direction under the action of means, such as a micrometric screw 33, these micrometric screws, controlling the two arms 59 supporting the two stops 32, being coupled so that they can be controlled simultaneously from a single control member, not shown.
  • the axes of the rollers constituting the fixed stops 32 are, in the inactive position of the cams 56 (that is to say in their portion 56 ′) and whatever the position of the rollers as a function of the length of the fiber sections to cut, located in a plane parallel to the plane passing through the longitudinal axes of the levers 37.
  • the cutter according to the invention also comprises, on the one hand, means 34 arranged to adjust the position of the mobile sheet 17 relative to the mobile support 16 and, d on the other hand, means 35 for adjusting the distance which can separate the movable jaw 22 from the clamp 20 from the fixed jaw 21, as a function of the thickness of the ribbon 6 of fibers transported step by step by the movable support 16.
  • the movable support 16 is supported and articulated, to be able to be driven in a substantially horizontal reciprocating movement, at the ends 36 of connecting rods 37 ′, forming part of the means 26 above , which have their other ends 38 mounted to pivot freely on fixed pins 39 having their axes which extend perpendicular to the direction of movement of the mobile support 16.
  • the movable support 16 is supported and articulated, to be able to be driven in a substantially horizontal reciprocating movement, at the ends 36 of connecting rods 37 ′, forming part of the means 26 above , which have their other ends 38 mounted to pivot freely on fixed pins 39 having their axes which extend perpendicular to the direction of movement of the mobile support 16.
  • the mobile sheet 17 is , on the one hand, suspended and articulated at the ends 40 of a first set of connecting rods 41 having their other ends 42 articulated around an axis 43 parallel to the pins 39, on the crosspiece 44 of a gantry 45 arranged above of the movable support 16, the gantry being movable in a substantially vertical direction and the cross-member 44 being of adjustable height thanks to the above-mentioned means 34 constituted by screws 46 allow ant to immobilize in the chosen position the two parts 47 and 48 constituting each of the uprights of the gantry 45 and, on the other hand, joined to the mobile support 16 by a second set of connecting rods 49 articulated, at 50, on the mobile sheet 17 and , at 51, on the wings 19 of the U constituting this support 16 around axes parallel to those of the first set of connecting rods, these two sets of connecting rods 41 and 49 forming part of the above-mentioned means 27.
  • the movable sheet 17 is, so that it remains constantly parallel to the core 18 of the U formed by the movable support 16, on the one hand, suspended and articulated at the ends 40 of a set of connecting rods 41, the other ends of which are articulated, about an axis 43, parallel to the aforementioned pins 39, on a gantry 44, movable in a substantially vertical direction, of adjustable height and arranged at above the mobile support 16 and, on the other hand, joined to the latter by a set of deformable parallelograms 61 with axes parallel to those of the set of connecting rods 41, two parallel elements 61 ′ and 61 ⁇ of each of these deformable parallelograms being fixed respectively, perpendicular to the core 18 of the abovementioned U and symmetrically with respect to the longitudinal axis of the strip 6, to one of the wings 19 of the U and to the movable plate 17.
  • the movable jaw 22 of the clamp 20 is supported, at its ends and in an adjustable manner in height, by a frame 52, which is movable in a substantially vertical direction, supported and controlled by connecting rods 53, which are of axes parallel to the pins 39 and which form part of the above-mentioned means 28, articulated on fixed pivots 54.
  • the aforementioned means 26, 27 and 28 also include, to cause the movements of the movable support 16, of the gantry 45 supporting the movable sheet 17 and of the frame 52 supporting the movable jaw 22 of the clamp 20 are caused, in order to move the movable support 16 from its second to its first extreme position, in order to move the gantry 45 so that the movable plate 17 moves away from the upper face 29 of the ribbon 6 supported by the movable support 16 and in order to move the frame 52 so that the clamp 20 opens, by cams 55 and 56 either wedged on the same shaft (FIG. 8), or wedged on parallel shafts (FIG.
  • the supports 13 and 14 of the fixed knives 1 and mobile 2 are arranged to have with these large contact surfaces and said supports 13 and 14 are each pierced with at least one channel 58 which extends along the length of the support and which is intended to deliver passage to a refrigerant.
  • Means not shown are provided, on the one hand, for bringing this coolant to one end of the channels 58 produced in the supports as well as for collecting the fluid at the other end of the channels and, on the other hand, for making circulating, preferably continuously, said coolant through the channels 58.
  • the pivots 54 are advantageously of adjustable position in a direction parallel to the longitudinal axis of the ribbon 6 so as, on the one hand, to be able to adjust the position of the movable jaw 22 of the clamp 20 so that it is located as close as possible to the path of the movable knife 2, so as to immobilize the ribbon in the immediate vicinity of the knives 1 and 2 and, on the other hand, to modify the position of said movable jaw 22 as the fixed knife wears 1.
  • This adjustment of the pivots 54 is effected by acting on screws 64 moving in fixed slides 65, against springs 66, slides 67 carrying the pivots 54.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

A process for feeding fibres towards the fixed and mobile knives of a fibre cutter, such as a flock cutter, is provided which includes preparing a mattress of fibres aligned in a direction which is substantially perpendicular to the vertical plane of the knife so that the mattress of fibres takes the form of a band. The band is conveyed in a step-by-step manner towards the knives while supporting the band adjacent the fixed knife so that its lower face and its lateral side faces are supported by planer support surfaces having a dimension significant in relation to the length of sections of fibres being cut. The step-by-step conveying is effected by bringing the band to a temporary standstill in relation to the support surfaces as the fibres are advanced towards the cutter.

Description

La présente invention à pour objet un procédé pour l'entraînement de fibres en direction des couteaux fixe et mobile d'une coupeuse de fibres, en particulier d'une coupeuse de floc.The present invention relates to a method for entraining fibers in the direction of the fixed and mobile knives of a fiber cutter, in particular a flock cutter.

Dans toutes les coupeuses connues, les fibres sont entraînées en direction des couteaux par pincement entre des cylindres lisses entraînés en rotation autour d'axes s'étendant transversalement à la direction de déplacement des fibres, ces dernières étant immobilisées temporairement, toujours par pincement et en amont des couteaux, au moment de la coupe (voir FR-A- 1 457 318).In all known cutters, the fibers are entrained in the direction of the knives by pinching between smooth cylinders driven in rotation about axes extending transversely to the direction of movement of the fibers, the latter being immobilized temporarily, always by pinching and in upstream of the knives, at the time of cutting (see FR-A- 1 457 318).

Cette façon de faire présente l'inconvénient de ne pas assurer un entraînement régulier des fibres du fait, d'une part, que celles-ci ne sont pincées par les cylindres qu'au voisinage de leurs génératrices qui se font face et qu'un glissement des fibres par rapport aux cylindres lisses est inévitable, et, d'autre part, que le matelas ou ruban formé par les fibres à entraîner est libre le long de ses bords latéraux. Si ces irrégularités dans l'entraînement des fibres est d'une importance relative dans des coupeuses de fibres sectionnant ces dernières en tronçons de longueur importante, elles deviennent inacceptables dans des coupeuses de floc, où la longueur des tronçons de fibres coupés est pratiquement toujours inférieure au mm.This procedure has the drawback of not ensuring regular entrainment of the fibers because, on the one hand, they are only pinched by the cylinders in the vicinity of their generatrices which face each other and that a sliding of the fibers with respect to the smooth cylinders is inevitable, and, on the other hand, that the mattress or ribbon formed by the fibers to be driven is free along its lateral edges. If these irregularities in the entrainment of fibers is of relative importance in fiber cutters cutting the latter into sections of considerable length, they become unacceptable in floc cutters, where the length of the sections of cut fibers is almost always less. to mm.

L'invention a pour but de remédier à cet inconvénient et de procurer un procédé qui permet, ce qui est particulièrement intéressant pour les coupeuses de floc, un entraînement extrêmement précis des fibres et ce, sans aucun glissement de ces fibres les unes par rapport aux autres, sur toute la section du ruban ou matelas de fibres, de sorte que les tronçons coupés ont une même longueur qui reste constante en cours de coupe.The object of the invention is to remedy this drawback and to provide a process which allows, which is particularly advantageous for flock cutters, an extremely precise entrainment of the fibers without any slipping of these fibers with respect to the others, over the entire section of the ribbon or fiber mat, so that the cut sections have the same length which remains constant during cutting.

A cet effet, suivant l'invention, ce procédé consiste à préparer un matelas de fibres que l'on aligne suivant une direction sensiblement perpendiculaire au plan vertical passant par l'arête du couteau fixe pour que ce matelas se présente sous la forme d'un ruban, à assurer le transport pas à pas du ruban vers les couteaux en supportant ledit ruban au voisinage du couteau fixe, pour que sa face inférieure et ses faces latérales soient soutenues chacune par une surface plane dont la dimension, prise parallèlement à la direction susdite, est importante par rapport à la longueur des tronçons de fibres à couper, qui est au minimum de l'ordre de 0,1 mm, le transport pas à pas et la coupe s'effectuant, en immobilisant temporairement le ruban par rapport aux surfaces susdites et en provoquant un mouvement alternatif desdites surfaces supportant le ruban suivant la direction précitée et dont l'amplitude est égale à un pas qui correspond à la longueur des tronçons de fibres à couper, d'après le cycle suivant et en considérant le couteau mobile à l'écart du ruban et les surfaces supportant ce dernier dans leur position la plus éloignée du couteau fixe : immobilisation temporaire du ruban sur les surfaces, fixes l'une par rapport à l'autre, qui le supportent au moins pendant tout le mouvement de ces surfaces en direction du couteau fixe pour amener en aval de ce dernier une portion de ruban dont la longueur est égale à la longueur des tronçons de fibres à couper, immobilisation temporaire du ruban dans une zone située entre la trajectoire du couteau mobile et les surfaces précitées lorsque ces dernières ont atteint leur position la plus proche du couteau fixe, coupe du ruban par le couteau mobile, libération du ruban par rapport aux surfaces qui le supportent, déplacement de ces surfaces pour les écarter du couteau fixe jusqu'à leur position la plus éloignée du couteau fixe, immobilisation du ruban sur les surfaces et libération du ruban dans la zone susdite,les immobilisations et libérations du ruban étant réglées pour que ce dernier soit constamment immobilisé soit par rapport aux surfaces quand il est libre dans la zone, soit dans cette zone quand il est libre par rapport aux surfaces.To this end, according to the invention, this method consists in preparing a fiber mat which is aligned in a direction substantially perpendicular to the vertical plane passing through the edge of the fixed knife so that this mattress is in the form of a ribbon, to ensure the step-by-step transport of the ribbon to the knives by supporting said ribbon in the vicinity of the fixed knife, so that its lower face and its lateral faces are each supported by a flat surface whose dimension, taken parallel to the direction aforementioned, is important compared to the length of the sections of fibers to be cut, which is at least of the order of 0.1 mm, the transport step by step and the cutting being carried out, by temporarily immobilizing the ribbon relative to the the aforementioned surfaces and by causing an alternating movement of said surfaces supporting the ribbon in the above-mentioned direction and the amplitude of which is equal to a pitch which corresponds to the length of the fiber sections to be cut, according to the following cycle and considering the movable knife away from the ribbon and the surfaces supporting the latter in their position furthest from the fixed knife: temporary immobilization of the ribbon on the surfaces, fixed one by relative to the other, which support it at least during the entire movement of these surfaces in the direction of the fixed knife to bring downstream of the latter a portion of ribbon whose length is equal to the length of the sections of fibers to be cut, immobilization temporary ribbon in an area between the path of the movable knife and the aforementioned surfaces when the latter have reached their position closest to the fixed knife, cutting of the ribbon by the movable knife, release of the ribbon from the surfaces which support it, displacement of these surfaces to move them away from the fixed knife to their position furthest from the fixed knife, immobilization of the tape on the surfaces and release of the r uban in the aforementioned area, the immobilizations and releases of the tape being adjusted so that the latter is constantly immobilized either relative to the surfaces when it is free in the area, or in this area when it is free relative to the surfaces.

Suivant une forme de réalisation avantageuse de l'invention, on commande, en synchronisme avec le couteau mobile et à partir de l'entraînement de celui-ci, le mouvement des surfaces précitées, l'immobilisation du ruban par rapport à ces surfaces ainsi que l'immobilisation du ruban dans la zone sus dite.According to an advantageous embodiment of the invention, the movement of the surfaces is controlled, in synchronism with the movable knife and from the drive thereof. above, immobilization of the tape relative to these surfaces as well as immobilization of the tape in the aforementioned area.

Suivant un mode de réalisation particulièrement avantageux de l'invention, on refroidit, de préférence en permanence, les supports des couteaux fixe et mobile de la coupeuse et l'on choisit des supports qui ont de grandes surfaces de contact avec les couteaux.According to a particularly advantageous embodiment of the invention, the supports of the fixed and movable cutter blades of the cutter are cooled, preferably permanently, and supports which have large contact surfaces with the blades are chosen.

L'invention a également pour objet une coupeuse, pour la mise en oeuvre du procédé susdit.The invention also relates to a cutter, for implementing the above process.

Suivant l'invention, cette coupeuse comprend un couteau fixe agencé sur un support de manière amovible, un couteau mobile agencé sur un support de manière amovible, un support fixe sensiblement horizontal, sur lequel repose le ruban de fibres et qui est situé sensiblement au même niveau que l'arête du couteau fixe de la coupeuse, un support mobile, dont la section, par un plan perpendiculaire à l'axe longitudinal du ruban, est en forme de U et dont les faces internes constituent les surfaces précitées qui supportent la face inférieure et les faces latérales du ruban, agencé dans le prolongement de l'extrémité du support fixe la plus proche du couteau fixe et sensiblement au même niveau que l'arête de ce dernier, une tôle plane, rigide et mobile, située, à un niveau supérieur à celui du support mobile, sensiblement parallèlement à l'âme du U et dont la surface est tout au plus légèrement inférieure à la surface de l'âme du U de telle sorte que ladite tôle puisse se déplacer, sensiblement parallèlement à elle-même entre les ailes du U formé par le support mobile, le ruban étant situé entre l'âme du U et la tôle, une pince située entre le support mobile et le couteau fixe et comprenant deux mâchoires parallèles s'étendant transversalement à l'axe longitudinal du ruban de fibres, une de ces mâchoires étant fixe et disposée sensiblement au même niveau que l'arête du couteau fixe, le ruban étant situé entre ces deux mâchoires, la coupeuse comprenant également des moyens agencés pour entraîner le couteau mobile en continu pour que celui-ci coopère avec le couteau fixe suivant un mouvement cyclique, des moyens pour animer le support mobile d'un mouvement alternatif suivant une direction sensiblement parallèle à l'axe longitudinal du ruban, des moyens pour animer d'un mouvement alternatif la tôle mobile suivant, d'une part, une direction sensiblement perpendiculaire à l'axe longitudinal du ruban et, d'autre part, une direction sensiblement parallèle audit axe, des moyens pour animer d'un mouvement alternatif la mâchoire mobile de la pince suivant une direction sensiblement perpendiculaire à l'axe longitudinal du ruban, les moyens animant le support mobile, la tôle mobile et la mâchoire mobile de la pince étant synchronisés avec les moyens d'entraînement du couteau mobile et agencés de manière à ce que, au cours d'un cycle du couteau mobile, c'est- à-dire entre chaque passage du couteau mobile en regard du couteau fixe, le support mobile soit entraîné pour effectuer un mouvement de va-et-vient entre deux positions extrêmes, une première position dans laquelle il est éloigné du couteau fixe et une seconde position dans laquelle il est proche du couteau fixe, la distance séparant ces deux positions extrêmes étant égale à la longueur des tronçons de fibres à couper; de manière à ce que, d'une part, la tôle mobile accompagne le support mobile dans son mouvement lorsqu'il passe de sa première position à sa seconde position extrême tout en étant en appui sur la face supérieure du ruban et, d'autre part, accompagne le support mobile lorsqu'il passe de sa seconde position à sa première position extrême tout en étant écarté de la face supérieure du ruban et de manière à ce que la mâchoire mobile de la pince soit, d'une part, en appui sur la face supérieure du ruban dès que le support mobile atteint sa seconde position extrême et pendant que le support mobile passe de sa seconde à sa première position extrême, la tôle mobile étant à ce moment écartée de la face supérieure du ruban, et, d'autre part, soit écartée de la face supérieure du ruban dès que le support mobile occupe sa première position extrême et dès que la tôle est en appui sur la face supérieure du ruban et pendant que ledit support passe de cette première position à sa seconde position extrême, la tôle étant constamment, pendant ce mouvement, en appui sur la face supérieure du ruban.According to the invention, this cutter comprises a fixed knife arranged on a removable support, a mobile knife arranged on a removable support, a substantially horizontal fixed support, on which the fiber ribbon rests and which is located substantially at the same level that the edge of the fixed knife of the cutter, a movable support, the section of which, by a plane perpendicular to the longitudinal axis of the ribbon, is U-shaped and whose internal faces constitute the aforementioned surfaces which support the face lower and the lateral faces of the ribbon, arranged in the extension of the end of the fixed support closest to the fixed knife and substantially at the same level as the edge of the latter, a flat, rigid and movable sheet, located at a level higher than that of the movable support, substantially parallel to the core of the U and the surface of which is at most slightly less than the surface of the core of the U so that said sheet can move, substantially parallel to itself between the wings of the U formed by the movable support, the ribbon being located between the core of the U and the sheet, a clamp located between the movable support and the fixed knife and comprising two jaws parallel extending transversely to the longitudinal axis of the fiber ribbon, one of these jaws being fixed and disposed substantially at the same level as the edge of the fixed knife, the ribbon being located between these two jaws, the cutter also comprising means arranged to drive the movable knife continuously so that it cooperates with the fixed knife in a cyclic movement, means for animating the mobile support in an alternating movement in a direction substantially parallel to the longitudinal axis of the ribbon, means to animate with a reciprocating movement the movable sheet following, on the one hand, a direction substantially perpendicular to the longitudinal axis of the ribbon and, on the other hand, a direction substantially parallel to said axis, means for alternating movement of the movable jaw of the pliers in a direction substantially perpendicular to the longitudinal axis of the ribbon , the means animating the movable support, the movable sheet and the movable jaw of the pliers being synchronized with the drive means of the movable knife and arranged so that, during a cycle of the movable knife, it is - ie between each passage of the movable knife opposite the stationary knife, the movable support is driven to perform a back-and-forth movement between two extreme positions, a first position in which it is distant from the stationary knife and a second position in which it is close to the stationary knife, the distance separating these two extreme positions being equal to the length of the sections of fibers to be cut; so that, on the one hand, the movable sheet accompanies the movable support in its movement when it passes from its first position to its second extreme position while being supported on the upper face of the strip and, on the other hand, accompanies the mobile support when it passes from its second position to its first extreme position while being moved away from the upper face of the tape and so that the movable jaw of the clamp is, on the one hand, in support on the upper face of the ribbon as soon as the mobile support reaches its second extreme position and while the mobile support passes from its second to its first extreme position, the mobile sheet being at this time separated from the upper face of the ribbon, and, d on the other hand, be moved away from the upper face of the ribbon as soon as the movable support occupies its first extreme position and as soon as the sheet is in abutment on the upper face of the ribbon and while said support passes from this premi re position to its second extreme position, the plate being constantly during this movement supported on the upper face of the ribbon.

D'autres détails et particularités de l'invention ressortiront de la description des dessins annexés au présent mémoire et qui illustrent, à titre d'exemples non limitatif, le procédé et la coupeuse suivant l'invention.Other details and particularities of the invention will emerge from the description of the drawings appended to this specification and which illustrate, by way of non-limiting examples, the method and the cutter according to the invention.

Les figures 1 à 7 sont des vues en élévation schématiques montrant les phases successives du procédé au cours d'un cycle de coupe.Figures 1 to 7 are schematic elevational views showing the successive phases of the process during a cutting cycle.

La figure 8 est une vue schématique, en élévation, montrant une coupeuse pour la mise en oeuvre du procédé susdit.Figure 8 is a schematic view, in elevation, showing a cutter for the implementation of the above method.

La figure 9 est une vue partielle, analogue à la figure 8, montrant une variante de la coupeuse illustrée à ladite figure 8.FIG. 9 is a partial view, similar to FIG. 8, showing a variant of the cutter illustrated in said FIG. 8.

La figure 10 est une vue en perspective, avec brisures partielles, montrant des détails de la coupeuse illustrée à la figure 9.FIG. 10 is a perspective view, partially broken, showing details of the cutter illustrated in FIG. 9.

La figure 11 est une vue partielle montrant un détail de la pince susdite.Figure 11 is a partial view showing a detail of the above clamp.

Dans les différentes figures, les mêmes notations de référence désignent des éléments identiques ou analogues.In the different figures, the same reference notations designate identical or analogous elements.

Le procédé suivant l'invention est destiné à l'entraînement de fibres en direction des couteaux fixe 1 et mobile 2 d'une coupeuse de fibres, en particulier d'une coupeuse de floc, et il consiste tout d'abord à préparer un matelas de fibres 3 que l'on aligne suivant une direction sensiblement perpendiculaire au plan vertical, de trace 4, passant par l'arête 5 du couteau fixe 1 de manière à ce que ce matelas se présente sous la forme d'un ruban 6. Le transport du ruban vers les couteaux s'effectue pas à pas en supportant ledit ruban, au voisinage du couteau fixe 1, pour que sa face inférieure 7 et ses faces latérales 8 soient soutenues chacune par une surface plane 9 dont la dimension, prise parallèlement à la direction susdite, est importante par rapport à la longueur des tronçons 10 de fibres à couper, qui est au minimum de l'ordre de 0,1 mm. Ledit transport pas à pas et la coupe s'effectuent, en immobilisant temporairement le ruban 6 par rapport aux surfaces 9 pour éviter tout glissement des fibres 3 du ruban les unes sur les autres pendant le transport et en provoquant un mouvement alternatif des surfaces 9 supportant le ruban suivant la direction précitée et dont l'amplitude est égale à un pas qui correspond à la longueur des tronçons 10 de fibres à couper, d'après le cycle défini ci-après et en considérant, comme phase de départ, le couteau mobile 2 à l'écart du ruban 6 et les surfaces 9 supportant ce dernier dans leur position la plus éloignée du couteau fixe 1 (voir figure 1) : immobilisation temporaire du ruban 6 (voir figure 1) sur les surfaces 9, qui sont fixes l'une par rapport à l'autre et qui le supportent au moins pendant tout le mouvement de ces surfaces en direction du couteau fixe 1 pour amener en aval de ce dernier, comme montré à la figure 2, une portion de ruban 11 dont la longueur est égale à la longueur des tronçons 10, immobilisation temporaire du ruban dans une zone 12 située entre la trajectoire du couteau mobile 2 et les surfaces 9 précitées lorsque celles-ci ont atteint, comme montré à la figure 3, leur position la plus proche du couteau fixe 1, coupe du ruban par le couteau mobile 2 (voir figure 4), libération du ruban 6 par rapport aux surfaces 9 qui le supportent (voir figure 5), déplacement de ces surfaces 9 pour les écarter du couteau fixe 1 (figure 6) et libération du ruban 6 dans la zone 12 précitée lorsque les surfaces 9 ont atteint leur position la plus éloignée du couteau fixe et que le ruban 6 est immobilisé par rapport aux surfaces 9.The method according to the invention is intended for entraining fibers in the direction of the fixed knives 1 and mobile 2 of a fiber cutter, in particular a flock cutter, and it consists first of all in preparing a mattress of fibers 3 which are aligned in a direction substantially perpendicular to the vertical plane, of trace 4, passing through the edge 5 of the fixed knife 1 so that this mattress is in the form of a ribbon 6. The transport of the ribbon to the knives is carried out step by step by supporting said ribbon, in the vicinity of the fixed knife 1, so that its lower face 7 and its lateral faces 8 are each supported by a flat surface 9 whose dimension, taken parallel to the aforementioned direction is important relative to the length of the sections 10 of fibers to be cut, which is at least of the order of 0.1 mm. Said step-by-step transport and the cutting are carried out, by temporarily immobilizing the ribbon 6 relative to the surfaces 9 to avoid any sliding of the fibers 3 of the ribbon on each other during transport and by causing an alternating movement of the surfaces 9 supporting the ribbon in the above-mentioned direction and the amplitude of which is equal to a pitch which corresponds to the length of the sections 10 of fibers to be cut, according to the cycle defined below and considering, as the starting phase, the movable knife 2 away from ribbon 6 and the surfaces 9 supporting the latter in their position furthest from the fixed knife 1 (see FIG. 1): temporary immobilization of the tape 6 (see FIG. 1) on the surfaces 9, which are fixed relative to one another and which support it at least during the entire movement of these surfaces in the direction of the fixed knife 1 in order to bring downstream of the latter, as shown in FIG. 2, a portion of ribbon 11 whose length is equal to the length of the sections 10, immobilization temporary ribbon in a zone 12 located between the path of the movable knife 2 and the aforementioned surfaces 9 when the latter have reached, as shown in FIG. 3, their position closest to the fixed knife 1, cutting of the ribbon by the knife mobile 2 (see FIG. 4), release of the ribbon 6 relative to the surfaces 9 which support it (see FIG. 5), displacement of these surfaces 9 to separate them from the fixed knife 1 (FIG. 6) and release of the ribbon 6 in the area 12 mentioned above when the surfaces 9 have reached their position furthest from the stationary knife and the strip 6 is immobilized with respect to surfaces 9.

Suivant l'invention, on immobilise le ruban 6 par rapport aux surfaces 9 en exerçant une pression régulièrement répartie sur la surface supérieure 29 dudit ruban, tandis que l'immobilisation du ruban dans la zone 12 susdite s'effectue par pinçage de celui-ci en prenant appui sur les faces inférieure 7 et supérieure 29 dudit ruban, le procédé suivant l'invention prévoyant le réglage de l'amplitude du mouvement alternatif des surfaces 9 susdites en fonction de la longueur des fibres à couper ainsi que le réglage, d'une part, de l'immobilisation dudit ruban 6 par rapport aux surfaces 9 et, d'autre part, l'immobilisation du ruban 6 dans la zone 12 en fonction de l'épaisseur de ce ruban, épaisseur que l'on maintient sensiblement constante.According to the invention, the ribbon 6 is immobilized with respect to the surfaces 9 by exerting a pressure regularly distributed over the upper surface 29 of the said ribbon, while the immobilization of the ribbon in the aforesaid zone 12 is carried out by pinching the latter. by resting on the lower 7 and upper 29 faces of said strip, the method according to the invention providing for the adjustment of the amplitude of the reciprocating movement of the aforesaid surfaces 9 as a function of the length of the fibers to be cut as well as the adjustment of on the one hand, the immobilization of said ribbon 6 relative to the surfaces 9 and, on the other hand, the immobilization of the ribbon 6 in the zone 12 as a function of the thickness of this ribbon, thickness which is kept substantially constant .

Le ruban 6 est préparé pour que sa largeur corresponde sensiblement à la distance qui sépare les surfaces 9 susdites destinées à supporter ses faces latérales 8. Pour optimaliser le rendement de la coupeuse, la distance susdite séparant ces surfaces 9 est choisie légèrement inférieure à la longueur des couteaux 1 et 2. Le mouvement alternatif des surfaces 9 faisant progresser pas à pas le ruban 6 dans la coupeuse, l'immobilisation temporaire du ruban 6 par rapport auxdites surfaces 9 ainsi que l'immobilisation temporaire du ruban 6 dans la zone 12 sont commandés à partir de l'entraînement du couteau mobile 2, en synchronisme avec ce dernier.The ribbon 6 is prepared so that its width corresponds substantially to the distance which separates the above-mentioned surfaces 9 intended to support its lateral faces 8. To optimize the performance of the cutter, the above-mentioned distance separating these surfaces 9 is chosen to be slightly less than the length knives 1 and 2. The reciprocating movement of surfaces 9 advancing step by step the ribbon 6 in the cutter, the temporary immobilization of the ribbon 6 relative to said surfaces 9 as well as the temporary immobilization of the ribbon 6 in the zone 12 are controlled from the drive of the movable knife 2, in synchronism with the latter.

Vu les cadences élevées des coupeuses, un échauffement important se produit au niveau des couteaux 1 et 2 et cet échauffement peut être suffisant pour agglomérer, voire souder certaines fibres en matière synthétique. Pour éviter cet inconvénient, le procédé suivant l'invention prévoit de refroidir en permanence les supports 13 et 14 des couteux fixe 1 et mobile 2, supports que l'on choisit pour qu'ils aient de grandes surfaces de contact avec lesdits couteaux.Given the high speeds of the cutters, significant heating occurs at knives 1 and 2 and this heating may be sufficient to agglomerate, or even weld certain fibers of synthetic material. To avoid this drawback, the method according to the invention provides for permanent cooling of the supports 13 and 14 of the expensive fixed 1 and movable 2 supports which are chosen so that they have large contact surfaces with said knives.

La coupeuse de fibres pour la mise en oeuvre du procédé susdit et illustrée schématiquement aux dessins comprend un couteau fixe 1 et un couteau mobile 2 qui sont montés de manière amovible respectivement sur un support 13 et un support 14, un support fixe 15 sensiblement horizontal, sur lequel repose le ruban 6 de fibres à couper et sur lequel ces fibres sont avantageusement alignées pour qu'elles s'étendent sensiblement parallèlement à la direction de déplacement du ruban dans la coupeuse, et qui est situé sensiblement au même niveau que l'arête 5 du couteau fixe 1 de la coupeuse, un support mobile 16, dont la section, par un plan perpendiculaire à l'axe longitudinal du ruban 6, est en forme de U et dont les faces internes constituent les surfaces 9 précitées qui supportent la face inférieure 7 et les faces latérales 8 du ruban, agencé dans le prolongement de l'extrémité du support fixe 15 la plus proche du couteau fixe 1 et sensiblement au même niveau que l'arête 5 de ce dernier. La coupeuse comprend également pour immobiliser temporairement le ruban 6 par rapport au support mobile 16, une tôle plane 17, rigide et mobile, située à un nivau supérieur au niveau du support mobile 16, sensiblement parallèlement à l'âme du U et dont la surface est tout au plus légèrement inférieure à la surface de l'âme 18 du U de telle sorte que ladite tôle 17 puisse se déplacer, sensiblement parallèlement à elle-même entre les ailes 19 du U formé par le support mobile 16, ce dernier formant avec la tôle 17 un conduit dans lequel est disposé le ruban 6. Ladite coupeuse comprend aussi, dans la zone 12 précitée, une pince 20 située entre le support mobile 16 et le couteau fixe 1, qui est constituée de deux mâchoires 21 et 22 qui sont parallèles et qui s'étendent transversalement à l'axe longitudinal du ruban 6 de fibres. La mâchoire 21 est fixe et disposée sensiblement au même niveau que l'arête 5 du couteau fixe 1, tandis que la mâchoire 22 est mobile suivant une direction sensiblement parallèle au plan vertical, de trace 4, susdit, le ruban 6 étant situé entre ces deux mâchoires 21 et 22. La coupeuse comprend également des moyens 23, tels que moteur 24 animant un système bielle-manivelle 25, pour entraîner le couteau mobile 2 en continu pour que celui-ci coopère avec le couteau fixe 1 suivant un mouvement cyclique.The fiber cutter for implementing the above-mentioned process and illustrated diagrammatically in the drawings comprises a fixed knife 1 and a movable knife 2 which are removably mounted respectively on a support 13 and a support 14, a fixed support 15 substantially horizontal, on which the ribbon 6 of fibers to be cut rests and on which these fibers are advantageously aligned so that they extend substantially parallel to the direction of movement of the ribbon in the cutter, and which is located substantially at the same level as the edge 5 of the fixed knife 1 of the cutter, a movable support 16, the cross section of which, by a plane perpendicular to the longitudinal axis of the ribbon 6, is U-shaped and the internal faces of which constitute the aforementioned surfaces 9 which support the face lower 7 and the lateral faces 8 of the ribbon, arranged in the extension of the end of the fixed support 15 closest to the fixed knife 1 and substantially at the same level as the ridge 5 of the latter. The cutter also comprises, to temporarily immobilize the ribbon 6 relative to the mobile support 16, a flat sheet 17, rigid and mobile, located at a level above the level of the mobile support 16, substantially parallel to the web of the U and whose surface is at most slightly less than the surface of the core 18 of the U so that said sheet 17 can move, substantially parallel to itself between the wings 19 of the U formed by the movable support 16, the latter forming with the sheet 17 a conduit in which the ribbon 6 is disposed. Said cutter also comprises, in the aforementioned zone 12, a clamp 20 located between the movable support 16 and the knife fixed 1, which consists of two jaws 21 and 22 which are parallel and which extend transversely to the longitudinal axis of the ribbon 6 of fibers. The jaw 21 is fixed and disposed substantially at the same level as the edge 5 of the fixed knife 1, while the jaw 22 is movable in a direction substantially parallel to the vertical plane, of trace 4, aforesaid, the ribbon 6 being located between these two jaws 21 and 22. The cutter also comprises means 23, such as a motor 24 driving a connecting rod-crank system 25, for driving the movable knife 2 continuously so that it cooperates with the fixed knife 1 in a cyclic movement.

Pour entraîner le ruban 6 pas à pas dans la coupeuse, celle-ci comprend des moyens 26 pour animer le support mobile 16 d'un mouvement alternatif suivant une direction sensiblement parallèle à l'axe longitudinal du ruban 6, tandis que l'immobilisation temporaire de celui-ci par rapport aux surfaces 9 et dans la zone 12 est obtenue grâce à des moyens 27 agencés pour animer d'un mouvement alternatif la tôle mobile 17 suivant, d'une part, une direction perpendiculaire à l'axe longitudinal du ruban 6 et, d'autre part, une direction sensiblement parallèle audit axe, et grâce à des moyens 28 agencés pour animer d'un mouvement alternatif la mâchoire mobile 22 de la pince 20 suivant une direction sensiblement perpendiculaire à l'axe longitudinal du ruban 6. Les moyens 26, 27 et 28 animant respectivement le support mobile 16, la tôle mobile 17 et la mâchoire mobile 22 de la pince 20 sont avantageusement synchronisés avec les moyens d'entraînement 23 du couteau mobile 2 et entraînés à partir de ces moyens 23. Ces moyens 26, 27 et 28 sont en outre agencés de manière à ce que, au cours d'un cycle du couteau mobile 2, c'est-à-dire entre chaque passage dudit couteau mobile en regard du couteau fixe 1, le support mobile 16 soit entraîné pour effectuer un mouvement de va-et-vient entre deux positions extrêmes, une seconde position dans laquelle il est proche du couteau fixe 1 et dans laquelle il pourrait, dans le cas d'une coupeuse à faible cadence, être maintenu immobile pendant la coupe du ruban 6 et une première position dans laquelle il est éloigné du couteau fixe 1, la distance séparant ces deux positions extrêmes étant égale à la longueur des tronçons 10 de fibres à couper. Ces moyens 26, 27 et 28 sont en outre agencés de manière à ce que, d'une part, la tôle mobile 17 accompagne le support mobile 16 dans son mouvement lorsqu'il passe de sa première position à sa seconde position extrême tout en étant en appui sur la face supérieure 29 du ruban 6 et, d'autre part, accompagne le support mobile lorsqu'il passe de sa seconde position à sa première position extrême tout en étant écarté de la face supérieure 29 du ruban et de manière à ce que la mâchoire mobile 22 de la pince 20 soit, d'une part, en appui sur la face supérieure 29 du ruban dès que le support mobile 16 atteint sa seconde position extrême, pendant l'immobilisation éventuelle du support mobile 16 dans cette seconde position extrême et pendant que le support mobile passe de sa seconde à sa première position extrême avec la tôle mobile 17 écartée de la face supérieure 29 du ruban et, d'autre part, soit écartée de la face supérieure 29 du ruban dès que le support mobile 16 occupe sa première position extrême et dès que la tôle 17 est en appui sur la surface supérieure 29 du ruban 6 et pendant que le support 16 passe de cette première position à sa seconde position extrême, la tôle 17 étant, pendant ce dernier mouvement, constamment en appui sur la face supérieure 29 du ruban.To drive the ribbon 6 step by step in the cutter, the latter comprises means 26 for animating the mobile support 16 with an alternating movement in a direction substantially parallel to the longitudinal axis of the ribbon 6, while the temporary immobilization of this with respect to the surfaces 9 and in the area 12 is obtained by means 27 arranged to reciprocate animate the movable sheet 17 along, on the one hand, a direction perpendicular to the longitudinal axis of the ribbon 6 and, on the other hand, a direction substantially parallel to said axis, and by means 28 arranged to reciprocate animate the movable jaw 22 of the clamp 20 in a direction substantially perpendicular to the longitudinal axis of the tape 6 The means 26, 27 and 28 respectively animating the movable support 16, the movable plate 17 and the movable jaw 22 of the clamp 20 are advantageously synchronized with the drive means 23 of the movable knife 2 and between seniors from these means 23. These means 26, 27 and 28 are further arranged so that, during a cycle of the movable knife 2, that is to say between each passage of said movable knife in Regarding the fixed knife 1, the mobile support 16 is driven to make a back-and-forth movement between two extreme positions, a second position in which it is close to the fixed knife 1 and in which it could, in the case of a low-speed cutter, be kept stationary during the cutting of the ribbon 6 and a first position in which it is distant from the stationary knife 1, the distance separating these two extreme positions being equal to the length of the sections 10 of fibers to be cut. These means 26, 27 and 28 are further arranged so that, on the one hand, the movable plate 17 accompanies the movable support 16 in its movement when it passes from its first position to its second extreme position while being resting on the upper face 29 of the ribbon 6 and, on the other hand, accompanies the mobile support when it passes from its second position to its first extreme position while being spaced from the upper face 29 of the ribbon and so that that the movable jaw 22 of the clamp 20 is, on the one hand, in abutment on the upper face 29 of the ribbon as soon as the movable support 16 reaches its second extreme position, during the possible immobilization of the movable support 16 in this second position extreme and while the movable support passes from its second to its first extreme position with the movable sheet 17 spaced from the upper face 29 of the ribbon and, on the other hand, is spaced from the upper face 29 of the ribbon as soon as the support m obile 16 occupies its first extreme position and as soon as the sheet 17 is in abutment on the upper surface 29 of the strip 6 and while the support 16 passes from this first position to its second extreme position, the sheet 17 being, during this last movement , constantly pressing on the upper face 29 of the ribbon.

La coupeuse de fibres suivant l'invention comprend des moyens 30 pour régler l'amplitude du mouvement alternatif du support mobile 16 en fonction de la longueur des tronçons 10 de fibres à couper. Ces moyens 30, qui sont agencés pour maintenir l'amplitude de ce mouvement alternatif constante lorsqu'elle a été réglée, comprennent, d'une part, une butée fixe 31 (voir figure 8), de position réglable pour ajuster sa position lors du montage et du réglage de la coupeuse, agencée pour déterminer avec une grande précision la seconde position extrême du support mobile 16 en limitant sa course en direction du couteau fixe 1, course qui est provoquée par la pression d'au moins un ressort 57, quelle que soit la longueur des tronçons 10 de fibres à couper et un excentrique 56 d'excentration réglable en fonction de la longueur des trançons 10 de fibres à couper, agencé pour agir sur le support 16 à l'encontre du ressort 57 pour amener ce support dans sa première position extrême.The fiber cutter according to the invention comprises means 30 for adjusting the amplitude of the reciprocating movement of the mobile support 16 as a function of the length of the sections 10 of fibers to be cut. These means 30, which are arranged to keep the amplitude of this reciprocating movement constant when it has been adjusted, comprise, on the one hand, a fixed stop 31 (see FIG. 8), of adjustable position to adjust its position during mounting and adjustment of the cutter, arranged to determine with great precision the second extreme position of the mobile support 16 by limiting its travel in the direction of the fixed knife 1, travel which is caused by the pressure of at least one spring 57, whatever whatever the length sections 10 of fibers to be cut and an eccentric eccentric 56 adjustable as a function of the length of the strands 10 of fibers to be cut, arranged to act on the support 16 against the spring 57 to bring this support into its first position extreme.

Dans la forme de réalisation de la coupeuse, illustrée à la figure 9, les moyens 30 pour régler l'amplitude du mouvement alternatif du support mobile 16 comprennent deux leviers 37 articulés sur le support 16 symétriquement par rapport à l'axe longitudinal du ruban 6, deux butées fixes 32, coopérant chacune à un levier 37 et de position réglable en fonction de la longueur des tronçons de fibres 10 à couper, contre lesquelles les leviers 37 sont appliqués par des ressorts 57 ainsi que deux cames 56 agissant sur ces leviers 37. les butées 32 et les cames 56 sont situées de part et d'autre des leviers 37 et ces butées 32 sont situées entre les articulations 58 des leviers 37 sur le support 16 et lesdites cames 56. Des ressorts 60 sont prévus pour maintenir les leviers 37 appliqués constamment contre les cames 56. Chacune des butées fixes 32 est avantageusement constituée par un galet dont l'axe est porté par un bras 59 pouvant se déplacer, pour régler la position du galet, suivant une direction verticale sous l'action de moyens, tels qu'une vis micrométrique 33, ces vis micrométriques, commandant les deux bras 59 supportant les deux butées 32, étant couplées afin de pouvoir être commandées simultanément à partir d'un organe de commande unique, non représenté. Les axes des galets constituant les butées fixes 32 sont, dans la position inactive des cames 56 (c'est-à-dire dans leur portion 56′) et quelle que soit la position des galets en fonction de la longueur des tronçons de fibres à couper, situés dans un plan parallèle au plan passant par les axes longitudinaux des leviers 37.In the embodiment of the cutter, illustrated in FIG. 9, the means 30 for adjusting the amplitude of the reciprocating movement of the movable support 16 comprise two levers 37 articulated on the support 16 symmetrically with respect to the longitudinal axis of the ribbon 6 , two fixed stops 32, each cooperating with a lever 37 and of adjustable position as a function of the length of the fiber sections 10 to be cut, against which the levers 37 are applied by springs 57 as well as two cams 56 acting on these levers 37 the stops 32 and the cams 56 are located on either side of the levers 37 and these stops 32 are located between the articulations 58 of the levers 37 on the support 16 and said cams 56. Springs 60 are provided to hold the levers 37 constantly applied against the cams 56. Each of the fixed stops 32 is advantageously constituted by a roller whose axis is carried by an arm 59 which can move, to adjust the position of the roller, in a vertical direction under the action of means, such as a micrometric screw 33, these micrometric screws, controlling the two arms 59 supporting the two stops 32, being coupled so that they can be controlled simultaneously from a single control member, not shown. The axes of the rollers constituting the fixed stops 32 are, in the inactive position of the cams 56 (that is to say in their portion 56 ′) and whatever the position of the rollers as a function of the length of the fiber sections to cut, located in a plane parallel to the plane passing through the longitudinal axes of the levers 37.

Outre les moyens 30 réglant l'amplitude du mouvement de support 16, la coupeuse suivant l'invention comprend également, d'une part, des moyens 34 agencés pour régler la position de la tôle mobile 17 par rapport au support mobile 16 et, d'autre part, des moyens 35, pour régler la distance pouvant séparer la mâchoire mobile 22 de la pince 20 de la mâchoire fixe 21, en fonction de l'épaisseur du ruban 6 de fibres transporté pas à pas par le support mobile 16.In addition to the means 30 regulating the amplitude of the support movement 16, the cutter according to the invention also comprises, on the one hand, means 34 arranged to adjust the position of the mobile sheet 17 relative to the mobile support 16 and, d on the other hand, means 35 for adjusting the distance which can separate the movable jaw 22 from the clamp 20 from the fixed jaw 21, as a function of the thickness of the ribbon 6 of fibers transported step by step by the movable support 16.

Dans la forme de réalisation de la coupeuse illustrée aux figures 8 et 9, le support mobile 16 est supporté et articulé, pour pouvoir être animé d'un mouvement alternatif pratiquement horizontal, aux extrémités 36 de bielles 37′, faisant partie des moyens 26 susdits, qui ont leurs autres extrémités 38 montées à pivotement libre sur des tourillons fixes 39 ayant leurs axes qui s'étendent perpendiculairement à la direction de déplacement du support mobile 16. Dans la forme de réalisation illustrée à la figure 8, la tôle mobile 17 est, d'une part, suspendue et articulée aux extrémités 40 d'un premier jeu de bielles 41 ayant leurs autres extrémités 42 articulées autour d'un axe 43 parallèle aux tourillons 39, sur la traverse 44 d'un portique 45 agencée au-dessus du support mobile 16, le portique étant mobile suivant une direction sensiblement verticale et la traverse 44 étant de hauteur réglable grâce aux moyens 34 susdits constitués par des vis 46 permettant d'immobiliser en position choisie les deux parties 47 et 48 constituant chacune des montants du portique 45 et, d'autre part, réunie au support mobile 16 par un second jeu de bielles 49 articulées, en 50, sur la tôle mobile 17 et, en 51, sur les ailes 19 du U constituant ce support 16 autour d'axes parallèles à ceux du premier jeu de bielles, ces deux jeux de bielles 41 et 49 faisant partie des moyens 27 précités. Dans la forme de réalisation de la coupeuse illustrée à la figure 9,, la tôle mobile 17 est, pour qu'elle reste constamment parallèle à l'âme 18 du U formé par le support mobile 16, d'une part, suspendue et articulée aux extrémités 40 d'un jeu de bielles 41, dont les autres extrémités 42 sont articulées, autour d'un axe 43, parallèle aux tourillons 39 susdits, sur un portique 44, mobile suivant une direction sensiblement verticale, de hauteur réglable et agencé au-dessus du support mobile 16 et, d'autre part, réunie à ce dernier par un jeu de parallélogrammes déformables 61 d'axes parallèles à ceux du jeu de bielles 41, deux éléments parallèles 61′ et 61˝ de chacun de ces parallélogrammes déformables étant fixés respectivement, perpendiculairement à l'âme 18 du U susdit et symétriquement par rapport à l'axe longitudinal du ruban 6, à une des ailes 19 du U et à la tôle mobile 17. Quant à la mâchoire mobile 22 de la pince 20, elle est supportée, à ses extrémités et de manière réglable en hauteur, par un cadre 52, qui est mobile suivant une direction sensiblement verticale, supporté et commandé par des bielles 53, qui sont d'axes parallèles aux tourillons 39 et qui font partie des moyens 28 susdits, articulées sur des pivots fixes 54.In the embodiment of the cutter illustrated in Figures 8 and 9, the movable support 16 is supported and articulated, to be able to be driven in a substantially horizontal reciprocating movement, at the ends 36 of connecting rods 37 ′, forming part of the means 26 above , which have their other ends 38 mounted to pivot freely on fixed pins 39 having their axes which extend perpendicular to the direction of movement of the mobile support 16. In the embodiment illustrated in FIG. 8, the mobile sheet 17 is , on the one hand, suspended and articulated at the ends 40 of a first set of connecting rods 41 having their other ends 42 articulated around an axis 43 parallel to the pins 39, on the crosspiece 44 of a gantry 45 arranged above of the movable support 16, the gantry being movable in a substantially vertical direction and the cross-member 44 being of adjustable height thanks to the above-mentioned means 34 constituted by screws 46 allow ant to immobilize in the chosen position the two parts 47 and 48 constituting each of the uprights of the gantry 45 and, on the other hand, joined to the mobile support 16 by a second set of connecting rods 49 articulated, at 50, on the mobile sheet 17 and , at 51, on the wings 19 of the U constituting this support 16 around axes parallel to those of the first set of connecting rods, these two sets of connecting rods 41 and 49 forming part of the above-mentioned means 27. In the embodiment of the cutter illustrated in FIG. 9, the movable sheet 17 is, so that it remains constantly parallel to the core 18 of the U formed by the movable support 16, on the one hand, suspended and articulated at the ends 40 of a set of connecting rods 41, the other ends of which are articulated, about an axis 43, parallel to the aforementioned pins 39, on a gantry 44, movable in a substantially vertical direction, of adjustable height and arranged at above the mobile support 16 and, on the other hand, joined to the latter by a set of deformable parallelograms 61 with axes parallel to those of the set of connecting rods 41, two parallel elements 61 ′ and 61˝ of each of these deformable parallelograms being fixed respectively, perpendicular to the core 18 of the abovementioned U and symmetrically with respect to the longitudinal axis of the strip 6, to one of the wings 19 of the U and to the movable plate 17. As for the movable jaw 22 of the clamp 20 , it is supported, at its ends and in an adjustable manner in height, by a frame 52, which is movable in a substantially vertical direction, supported and controlled by connecting rods 53, which are of axes parallel to the pins 39 and which form part of the above-mentioned means 28, articulated on fixed pivots 54.

Les moyens 26, 27 et 28 précités comprennent également, pour provoquer les mouvements du support mobile 16, du portique 45 supportant la tôle mobile 17 et du cadre 52 supportant la mâchoire mobile 22 de la pince 20 sont provoqués, afin de déplacer le support mobile 16 de sa seconde à sa première position extrême, afin de déplacer le portique 45 pour que la tôle mobile 17 s'écarte de la face supérieure 29 du ruban 6 soutenu par le support mobile 16 et afin de déplacer le cadre 52 pour que la pince 20 s'ouvre, par des cames 55 et 56 soit calées sur un même arbre (figure 8), soit calées sur des arbres parallèles (figure 9) entraînés en rotation autour de leur axe à partir des moyens d'entraînement 23 du couteau mobile 2, en synchronisme avec celui-ci, et agissant soit sur les leviers 37 susdits (figure 9), soit sur le support mobile 16 (figure 8), sur le portique 45 et sur le cadre 52, les mouvements desdits support mobile 16, portique 45 et cadre 52 s'effectuant en sens inverse, lorsqu'ils ne sont plus sollicités par les cames et pour rappeler ledit support mobile 16 dans sa seconde position extrême, (figure 8) et dans sa première position extrême (figure 9), la tôle mobile 17 en appui sur la face supérieure 29 du ruban 6 et la pince 20 en position de fermeture, sous l'action de ressorts de rappel 57, 57′ et 57˝.The aforementioned means 26, 27 and 28 also include, to cause the movements of the movable support 16, of the gantry 45 supporting the movable sheet 17 and of the frame 52 supporting the movable jaw 22 of the clamp 20 are caused, in order to move the movable support 16 from its second to its first extreme position, in order to move the gantry 45 so that the movable plate 17 moves away from the upper face 29 of the ribbon 6 supported by the movable support 16 and in order to move the frame 52 so that the clamp 20 opens, by cams 55 and 56 either wedged on the same shaft (FIG. 8), or wedged on parallel shafts (FIG. 9) driven in rotation about their axis from the drive means 23 of the movable knife 2, in synchronism with the latter, and acting either on the above-mentioned levers 37 (FIG. 9), or on the mobile support 16 (FIG. 8), on the gantry 45 and on the frame 52, the movements of said mobile support 16, gantry 45 and frame 52 made by in the opposite direction, when they are no longer stressed by the cams and to return said movable support 16 to its second extreme position (FIG. 8) and to its first extreme position (FIG. 9), the movable sheet 17 bearing on the face upper 29 of the ribbon 6 and the clamp 20 in the closed position, under the action of return springs 57, 57 ′ and 57˝.

Afin d'assurer le refroidissement des couteaux 1 et 2 pour éviter le collage ou la soudure des fibres, les supports 13 et 14 des couteaux fixe 1 et mobile 2 sont agencés pour avoir avec ces derniers de grandes surfaces de contact et lesdits supports 13 et 14 sont percés chacun d'au moins un canal 58 qui s'étend suivant la longueur du support et qui est destiné à livrer passage à un fluide réfrigérant. Des moyens non représentés sont prévus, d'une part, pour amener ce fluide réfrigérant à une des extrémités des canaux 58 réalisés dans les supports ainsi que pour recueillir le fluide à l'autre extrémité des canaux et, d'autre part, pour faire circuler, de préférence en continu, ledit fluide réfrigérant à travers les canaux 58.In order to ensure the cooling of the knives 1 and 2 to avoid sticking or welding of the fibers, the supports 13 and 14 of the fixed knives 1 and mobile 2 are arranged to have with these large contact surfaces and said supports 13 and 14 are each pierced with at least one channel 58 which extends along the length of the support and which is intended to deliver passage to a refrigerant. Means not shown are provided, on the one hand, for bringing this coolant to one end of the channels 58 produced in the supports as well as for collecting the fluid at the other end of the channels and, on the other hand, for making circulating, preferably continuously, said coolant through the channels 58.

Comme illustré à la figure 11, les pivots 54, sur lesquels sont articulées sur les bielles 53, sont avantageusement de position réglable suivant une direction parallèle à l'axe longitudinal du ruban 6 afin, d'une part, de pouvoir ajuster la position de la mâchoire mobile 22 de la pince 20 pour qu'elle soit située au plus près de la trajectoire du couteau mobile 2, de manière à immobiliser le ruban dans le voisinage immédiat des couteaux 1 et 2 et, d'autre part, de modifier la position de ladite mâchoire mobile 22 au fur et à mesure de l'usure du couteau fixe 1. Ce réglage des pivots 54 s'effectue en agissant sur des vis 64 se déplaçant dans des glissières fixes 65, à l'encontre de ressorts 66, des coulisseaux 67 portant les pivots 54.As illustrated in FIG. 11, the pivots 54, on which are articulated on the connecting rods 53, are advantageously of adjustable position in a direction parallel to the longitudinal axis of the ribbon 6 so as, on the one hand, to be able to adjust the position of the movable jaw 22 of the clamp 20 so that it is located as close as possible to the path of the movable knife 2, so as to immobilize the ribbon in the immediate vicinity of the knives 1 and 2 and, on the other hand, to modify the position of said movable jaw 22 as the fixed knife wears 1. This adjustment of the pivots 54 is effected by acting on screws 64 moving in fixed slides 65, against springs 66, slides 67 carrying the pivots 54.

Claims (18)

  1. A method for the drawing along of fibres in the direction of the fixed (1) and movable (2) knives of a flock cutter, characterised in that it consists of preparing a mattress of fibres (3) which is aligned in a direction substantially perpendicular to the vertical plane passing over the edge (5) of the fixed knife (1) so that this mattress presents itself in the form of a ribbon (6) to ensure the conveying step by step of the ribbon towards the knives by supporting the said ribbon in the vicinity of the fixed knife (1) in order that its lower face (7) and its lateral faces (8) are each supported by a flat surface (9) the dimension of which taken parallel to the aforesaid direction is large compared with the length of the pieces (10) of fibres to be cut which is at a minimum in the order of 0.1mm, conveys it step by step and cuts it effecting by immobilizing temporarily the ribbon with respect to the aforesaid surfaces (9) and causing an alterning movement of the said surfaces (9) supporting the ribbon (6) in the aforemention direction and the amplitude of which is equal to a pitch which corresponds to the length of the pieces (10) of fibres to be cut, after the following cycle and considering the movable knife (2) apart from the ribbon (6) and the surfaces (9) supporting this latter in their position farthest away from the fixed knife (1): temporary immobilization of the ribbon (6) on the surfaces (9) fixed in respect of one another which support it at least during the whole movement of these surfaces in the direction of the fixed knife (1) in order to bring below this latter a portion of ribbon (11) the length of which is equal to the length of the pieces (10) of fibres to be cut, temporary immobilization of the ribbon in a zone (12) situated between the trajectory of the movable knife (2) and the aforementioned surfaces (9) when these latter have reached their closest position to the fixed knife (1), cutting of the ribbon by the movable knife (2), release of the ribbon (6) in respect of the surfaces (9) which support it, displacement of these surfaces (9) in order to move them from the fixed knife (1) as far as their position farthest away from the fixed knife (1), immobilization of the ribbon (6) on the surfaces (9) and releasing of the ribbon (6) in the zone (12), the immobilizations and releasings of the ribbon (6) being adjusted so that this latter is constantly immobilized either in respect of the surfaces (9) when it is free in the zone (12) or in this zone (12) when it is free in respect of the surfaces (9).
  2. A method according to claim 1, characterised in that the amplitude of the alternating movement of the aforesaid surfaces (9) is regulated according to the length of the pieces (10) of fibres to be cut.
  3. A method according to one or other of the claims 1 and 2, characterised in that the immobilization of the ribbon (6) is regulated in respect of the surfaces (9) which support it and the immobilization of the ribbon in the aforesaid zone (12) according to the thickness of the ribbon which is kept substantially constant.
  4. A method according to any of the claims 1 to 3, characterised in that one controls in synchronism with the movable knife (2) and from the drawing along of the latter, the movement of the aforesaid surfaces (9), the immobilization of the ribbon (6) in respect of these surfaces (9) as well as the immobilization of the ribbon in the aforesaid zone (12).
  5. A method according to any one of the claims 1 to 4, characterised in that the ribbon (6) is prepared so that its width corresponds substantialy to the distance separating the surfaces (9) intended to cooperate with its lateral faces (8), this distance being slightly less than the length of the knives (1,2).
  6. A method according to any of the claims 1 to 5, characterised in that one cools preferably permanently, the supports (13,14) of the fixed (1) and movable (2) knives of the cutter and supports are selected which have large contact surfaces with the knives.
  7. A fibre cutter in particular a flock cutter for the implementation of the method according to any of the claims 1 to 6, characterised in that it comprises a fixed knife (1) arranged on a support (13) in detachable manner, a movable knife (2) arranged on a support (14) in detachable manner, a substantially horizontal fixed support (15) on which the ribbon of fibres rests and which is situated substantially at the same level as the edge (5) of the fixed knife (1) of the cutter, a movable support (16) the section of which, through a plane perpendicular to the longitudinal axis of the ribbon (6) is of U-shape and the inner faces of which constitute the aforesaid surfaces (9) which support the lower face (7) and the lateral faces (8) of the ribbon arranged in the extension of the end of the fixed support (15) nearest the fixed knife (1) and substantially at the same level as the edge (5) of this latter, a flat, rigid and movable plate (17) situated at a level higher than that of the movable support (16) substantially parallel to the web of the U and the surface of which is at the most slightly lower than the surfaces of the web (18) of the U such that the said plate (17) may be displaced substantially parallel to itself between the flanges (19) of the U formed by the movable support (16), the ribbon (6) being situated between the web of the U and the plate, a pincer (20) situated between the movable support (16) and the fixed knife (1) and comprising two parallel jaws (21,22) extending crosswise to the longitudinal axis of the ribbon of fibres, one of these jaws (21) being fixed and disposed substantially at the same level as the edge (5) of the fixed knife (1), the ribbon (6) being situated between these two jaws (21,22), the cutter likewise comprising means (23) arranged to carry along the movable knife (2) continuously so that this latter cooperates with the fixed knife (1) following a cyclic movement, means (26) to actuate the movable support (16) with an alternating movement following a direction substantially parallel to the longitudinal axis of the ribbon (6) means (27) to actuate by an alternating movement the movable plate (17) along, on the one hand a direction substantially perpendicular to the longitudinal axis of the ribbon (6) and on the other hand, a direction substantially parallel to the said axis, means (28) to activate by an alternating movement the movable jaw (22) of the pincers (20) along a direction substantially parallel to the longitudinal axis of the ribbon (6), the means (26,27 and 28) actuating the movable support (16), the movable plate (17) and the movable jaw (22) of the pincers (20) being synchronized with the drawing along means (23) of the movable knife (2) and arranged such that, in the course of cycle of the movable knife, that is to say, between each passage of the movable knife opposite the fixed knife (1), the movable support (16) is drawn along to effect a to-and-fro movement between two extreme positions, a first position in which it is moved away from the fixed knife and a second position in which it is near the fixed knife, the distance separating these two extreme positions being equal to the lengths of the pieces (10) of fibres to be cut; in such a manner that, on the one hand, the movable plate (17) accompanies the movable support (16) in its movement when it passes from its first position to its second extreme position whilst being supported on the upper face (29) of the ribbon (6) and on the other hand accompanies the movable support when it passes from its second position to its first extreme position whilst being moved away from the upper face (29) of the ribbon and such that the movable jaw (22) of the pincers (20) is on the one hand supported on the upper face (29) of the ribbon as soon as the movable support reaches its second extreme position and whilst the movable support passes from its second to its first extreme position, the movable plate (17) being at this moment away from the upper face (29) of the ribbon (6) and on the other hand, is away from the upper face (29) of the ribbon (6) as soon as the movable support (16) occupies its first extreme position and as soon as the plate (17) is supported on the upper face (29) of the ribbon and whilst the said support (16) passes from this first position to its second extreme position, the plate (17) being constantly during this movement supported on the upper face (29) of the ribbon.
  8. A fibre cutter according to claim 7, characterised in that it comprises means (30) for regulating the amplitude of the alternating movement of the aforementioned movable support (16) according to the length of the pieces (10) of fibres to be cut.
  9. A fibre cutter according to claim 8, characterised in that the means (30) for regulating the amplitude of the alternating movement of the movable (16) are arranged for keeping this latter constant when the said amplitude is regulated.
  10. A fibre cutter according to any one of the claims 7 to 9, characterised in that it comprises means (34 and 35) for regulating respectively the position of the movable plate (17) and the movable jaw (22) of the pincers (20) according to the thickness of the ribbon (6) of fibres to be cut.
  11. A fibre cutter according to either of the claims 9 and 10, characterised in that the means (30) for regulating the amplitude of the alternating movement of the movable support comprise a fixed stop (31) arranged to determine the second extreme position of the support (16) by limiting its course in the direction of the fixed knife (1) a course which is caused by the pressure of at least one spring (57) whatever the length of the pieces (10) of fibres to be cut and a throw off centre cam (56) adjustable according to the length of the pieces (10) of fibres to be cut arranged to act on the support (16) against the spring (57) to bring this support into its first extreme position.
  12. A fibre cutter according to either of claims 9 and 10, characterised in that the means (30) to regulate the amplitude of the alternating movement of the movable support (16) comprise two levers (37) articulated symmetrically on the support (16) in respect of the longitudinal axis of the ribbon (6), two fixed stops (32) each cooperating with a lever and of adjustable position according to the length of the pieces of fibre (10) to be cut against which the levers are applied by springs (57) and two cams (56) acting on these levers, the stops (32) and the cams (56) being situated on both sides of the levers (37), the stops (32) being situated between the articulations (58) of the levers (37) on the support (16) and the cams (56) of the springs (60) being provided to keep the levers (37) applied against the cams (56).
  13. A fibre cutter according to claim 12, characterised in that each of the fixed stops (32) is constituted by a roller the axis of which is supported by an arm (59) capable of being moved about to regulate the position of the roller along a vertical direction under the action of means such as a micrometer screw (33), these micrometer screws controlling the two arms (59) supporting the two stops (32) being coupled so as to be capable of being controlled simultaneously, the axes of the rollers constituting fixed stops (32) being, in the inactive position of the cams (56) and whatever their position according to the length of the pieces of fibres to be cut, situated in a plane parallel to the plane passing through the longitudinal axes of the levers (37).
  14. A fibre cutter according to any of the claims 7 to 13, characterised in that the movable support (16) is supported and articulated at the ends (36) of rods (37′) the other ends (38) of which are mounted on fixed journals (39) of axles perpendicular to the direction of displacement of the movable support (16), the movable plate (17) being on the one hand, suspended and articulated at the ends (40) of a first set of rods (41) the other ends (42) of which are articulated around an axis (43) parallel to the aforesaid journals (39) on a cross-beam (45), movable in a substantially vertical direction, of adjustable height and arranged above the movable support (16) and on the other hand, joined to this latter by a second set of rods (49), with axes parallel to those of the first set, articulated on the plate (17) and on the flanks (19) of the constituting the movable support (16), the movable jaw (22) of the pincers (20) being supported, at its ends and in height adjustable manner by a movable frame (52) along a substantially vertical direction, itself supported by rods (53) with axes parallel to the aforesaid journals, articulated on fixed pivots (54).
  15. A fibre cutter according to any one of the claims 7 to 13, characterised in that the movable support (16) is supported and articulated at the ends (36) of rods (37′) the other ends (38) of which are mounted on fixed journals (39) with axes perpendicular to the direction of displacement of the movable support (16), the movable plate (17) being, on the one hand, suspended and articulated at the ends (40) of a set of rods (41) the other ends (42) of which are articulated around an axis (43) parallel to the aforesaid journals (39), on a cross-beam (44) movable along a substantialy vertical direction, of adjustable height and arranged above the movable support (16) and on the other hand, joined to this latter by a set of deformable parallelograms being fixed respectively to those of the set of rods (41), two parallel elements (61′) of each of these deformable parallelograms being fixed respectively, perpendicularly to the web (18) of the aforesaid U and symetrically in respect of the longitudinal axis of the ribbon (6), to one of the flanks (19) of the U and to the movable plate (17), the movable jaw (22) of the pincers (20) being supported at its ends and in height adjustable manner by a movable frame (52) along a substantially vertical direction, itself supported by rods (53) with axes parallel to the aforementioned journals (39) articulated on fixed pivots (54).
  16. A fibre cutter according to either of the claims 14 and 15, characterised in that the movements of the movable support (16), of the cross-beam supporting the movable plate (17) and of the frame (52) supporting the movable jaw (22) of the pincers (20) are caused, in order to displace the movable support (16) from either of its extreme positions to displace the cross-beam (45) so that the movable plate (17) moves away from the ribbon (6) held by the movable support (16) and to displace the frame (52) so that the pincers (20) opens, by cams (55,56) set in rotation from driving means (23) of the movable knife (2) in synchronism with the latter and acting either on the aforesaid levers (37) or on the movable support (16), on the cross-beam (45) and on the frame (52), the movements of the said movable support, cross-beam and frame being effected in opposite direction to bring back the said movable support (16) into one of its extreme positions, the movable plate (17) supported on the ribbon (6) and the pincers (20) in closed position respectively under the action of drawback-springs (57, 57′ and 57˝).
  17. A fibre cutter according to any one of claims 7 to 16, characterised in that the supports (13 and 14) of the fixed (1) and movable (2) knives are arranged in order to have with these latter, large contact surfaces, the said supports each being pierced by at least one channel (58) extending along the length of the support and intended to leave the way open to a cooling fluid, means being provided, on the one hand, to lead this cooling fluid to one of the ends of the channels (58) made in the supports as well as to collect it and on the other hand to cause to circulate, preferably continuously, the said cooling fluid through the aforesaid channels (58).
  18. A fibre cutter according to any one of claims 14 to 17, characterised in that the aforesaid fixed pivots (54) are of adjustable position along a direction parallel to the longitudinal axis of the ribbon (6) in order, on the one hand, to be able to adjust the position of the movable jaw (22) of the pincers (20) so that it is situated nearest to the trajectory of the movable knife (2) so as to immobilize the ribbon in the immediate vicinity of the knives (1 and 2) and on the other hand, to modify the position of the said movable jaw (22) as the wear of the fixed knife (1) proceeds.
EP19880908120 1987-10-02 1988-09-23 Method for feeding fibres to a fibre cutting machine, and fibre cutting machine for implementing such method Expired - Lifetime EP0386017B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88908120T ATE81875T1 (en) 1987-10-02 1988-09-23 METHOD AND DEVICE FOR DRIVING FIBERS IN A FIBER CUTTING MACHINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8701125 1987-10-02
BE8701125A BE1000675A3 (en) 1987-10-02 1987-10-02 Method for training in fiber and fiber cutter cutter for the implementation of this method.

Publications (2)

Publication Number Publication Date
EP0386017A1 EP0386017A1 (en) 1990-09-12
EP0386017B1 true EP0386017B1 (en) 1992-10-28

Family

ID=3882897

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880908120 Expired - Lifetime EP0386017B1 (en) 1987-10-02 1988-09-23 Method for feeding fibres to a fibre cutting machine, and fibre cutting machine for implementing such method

Country Status (10)

Country Link
US (1) US5046220A (en)
EP (1) EP0386017B1 (en)
JP (1) JP2714416B2 (en)
AT (1) ATE81875T1 (en)
BE (1) BE1000675A3 (en)
BR (1) BR8807725A (en)
CA (1) CA1315189C (en)
DE (1) DE3875623T2 (en)
ES (1) ES2011855A6 (en)
WO (1) WO1989002940A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012122083A1 (en) 2011-03-05 2012-09-13 The Procter & Gamble Company Method and device for grinding strand-like fibrous material

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2415507T3 (en) 2010-07-23 2013-07-25 Philippe Pierret Improvements in or relating to cutting machines
EP2410083B1 (en) 2010-07-23 2013-03-27 Philippe Pierret Improvements in or relating to cutting machines
US8628456B2 (en) 2012-03-05 2014-01-14 The Procter And Gamble Company Process for making absorbent component
US8733678B2 (en) 2012-03-05 2014-05-27 The Procter And Gamble Company Method and device for grinding strand-like fibrous material
KR101443897B1 (en) 2013-06-04 2014-09-23 주식회사 비엠오 Apparatus for loading the cloth roll spreding machine

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL259524A (en) *
CA559838A (en) * 1958-07-01 E. Swasey Samuel Wire feeding apparatus
US744328A (en) * 1903-05-04 1903-11-17 Thomas Frtschek Hay or straw cutter.
US3162080A (en) * 1962-10-26 1964-12-22 Fmc Corp Feed means for staple fiber cutter
FR1457318A (en) * 1964-11-03 1966-11-04 Shears intended in particular for cutting, into small particles, textile fibers or threads
US3334533A (en) * 1965-02-19 1967-08-08 Monsanto Co Staple fiber cutting mechanism
US3479911A (en) * 1966-06-27 1969-11-25 Warren Galkin Strap feed and cutoff machine
US3728922A (en) * 1971-07-28 1973-04-24 Kayser Roth Corp Apparatus for feeding and cutting a band of sheet material
ES459239A1 (en) * 1977-05-27 1978-03-01 Mondejar Cadevall Juan Cutter device for fibres with movable blade - which descends linearly on fixed blade and returns in curved path away from cut fibres

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012122083A1 (en) 2011-03-05 2012-09-13 The Procter & Gamble Company Method and device for grinding strand-like fibrous material
WO2012122084A1 (en) 2011-03-05 2012-09-13 The Procter & Gamble Company Process for making absorbent component
CN103415656A (en) * 2011-03-05 2013-11-27 宝洁公司 Method and device for grinding strand-like fibrous material
CN103415656B (en) * 2011-03-05 2016-01-20 宝洁公司 For the method and apparatus of strand sample fibrous material of milling

Also Published As

Publication number Publication date
ATE81875T1 (en) 1992-11-15
US5046220A (en) 1991-09-10
JP2714416B2 (en) 1998-02-16
DE3875623D1 (en) 1992-12-03
JPH03500426A (en) 1991-01-31
EP0386017A1 (en) 1990-09-12
CA1315189C (en) 1993-03-30
WO1989002940A1 (en) 1989-04-06
BR8807725A (en) 1990-10-09
ES2011855A6 (en) 1990-02-16
DE3875623T2 (en) 1993-05-19
BE1000675A3 (en) 1989-03-07

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