EP0517568B1 - Cross-lapper - Google Patents

Cross-lapper Download PDF

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Publication number
EP0517568B1
EP0517568B1 EP92401461A EP92401461A EP0517568B1 EP 0517568 B1 EP0517568 B1 EP 0517568B1 EP 92401461 A EP92401461 A EP 92401461A EP 92401461 A EP92401461 A EP 92401461A EP 0517568 B1 EP0517568 B1 EP 0517568B1
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EP
European Patent Office
Prior art keywords
carriage
rollers
auxiliary
carriages
web
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EP92401461A
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German (de)
French (fr)
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EP0517568A1 (en
Inventor
Robert Jean
Bernard Chatelet
Bernard Jourde
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Asselin SA
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Asselin SA
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/74—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being orientated, e.g. in parallel (anisotropic fleeces)
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G25/00—Lap-forming devices not integral with machines specified above

Definitions

  • the present invention relates to a lapper spreader for transforming by folding a web into a web.
  • FR - B - 2 553 102 such a machine in which a veil, coming from a carding machine, is first transported by a first mat, called front mat, to a pinch zone where it is held between the first and a second mat and transported to an exit cart.
  • the back-and-forth movement of the exit carriage above a receiving apron causes a deposition of the veil which it delivers, by alternating folds, in accordion, on the apron.
  • the apron moves in a direction parallel to the axes of the guide rollers carried by the output carriage, the successive folds are offset along this direction and the web forms on the apron a continuous sheet whose lateral edges are defined by the folds.
  • the start of the pinch zone is defined in the mobile position by an input carriage which moves back and forth intended to make the speed of admission of the web into the spreader and the speed of unwinding of the web compatible. by the exit carriage despite the back and forth movements of the latter.
  • the veil which is of fragile constitution is disturbed neither by piling, nor by stretching, nor by friction.
  • the comings and goings of the input carriage is compensated by the opposite comings and goings of the output carriage and vice versa thanks to an appropriate arrangement of the guide rollers (see for example FR - B - 2,553,102).
  • auxiliary carriages which also perform back and forth movements. translation to selectively lengthen or shorten the belts outside the nip area and thus compensate for variations in length of the nip area.
  • the present application relates more particularly to this second type of embodiment.
  • One of the aims of the present invention is to solve these difficulties and to present a spreader-lapper producing a regular sheet, even at high speed.
  • the spreader-lapper comprises two belts each following a closed path and associated with rollers for their respective guidance and drive, the closed paths being external to each other and adjacent to each other. other in a nip defined by guide rollers carried by two main carriages movable in translation in a horizontal direction and perpendicular to the axes of the rollers, compensating means, comprising at least one auxiliary carriage movable in translation perpendicular to the axes of the rollers , to keep the length of each of the closed paths substantially constant, each closed path having a 180 degree turn around at least one guide roller carried by an auxiliary carriage, means for bringing the veil to the entrance of the zone pinch, an apron movable in a direction parallel to the axes of the rollers and receiving the veil at its exit from the pinch zone, and drive means for applying back and forth translation movements to the main carriages and to the compensating means.
  • this spreader-lapper is characterized in that each auxiliary carriage is situated in a lower passage extending under the apron and separated from it by means such as a partition to counter the propagation towards the veil and / or the sheet in formation of the air currents generated in particular by the auxiliary carriages.
  • the air currents caused by the back and forth movement of the auxiliary carriages do not do not reach the level of the veil or the tablecloth, or at least arrive there substantially attenuated because they remain essentially confined inside the underpass. Consequently, these movements practically do not affect the regularity of the transport of the veil and the sheet formed therefore has improved homogeneity.
  • the spreader-lapper shown in perspective in FIG. 1 comprises a first mat 2, said front mat which collects the veil of fibers 4, for example from a card not shown, and transports it into the enclosure 1 where it is transformed by folding into a ply 6 transported by an apron 8 outside the enclosure 1.
  • the apron 8 transports the formed ply 6, for example to a needling machine not shown.
  • the directions of transport of the web 4 and of the web 6 are respectively indicated in FIG. 1 by the arrows F and K.
  • the side 7 adjacent to the face through which penetrates the web 4 and "rear side" of the spreader-lapper the side 9 opposite to the front side 7.
  • the interior of the spreader-lapper is shown schematically in the elevation views of FIGS. 2 to 4, taken along a plane Q perpendicular to the direction of transport of the ply 6 by the deck 8.
  • the spreader-lapper Associated with the front mat 2, the spreader-lapper comprises a second mat 5, called the rear mat.
  • the belts 2 and 5, shown in solid lines in FIGS. 2 to 4, have the same width and have their lateral edges in the same planes parallel to the plane of FIGS. 2 to 4.
  • the front carpet 2 follows a closed path consisting of sections 20 to 31 delimited by cylindrical guide rollers 32 to 43.
  • the rear belt 5 follows a closed path consisting of sections 50 to 59 delimited by cylindrical guide rollers 60 to 69.
  • the guide rollers 32 to 43, 60 to 69 are pivotally mounted around respective axes perpendicular to the plane of Figures 2 to 4, that is to say parallel to the direction of movement of the deck 8.
  • the axes of the rollers 32 , 33, 39, 40, 42, 43 and 65, 66, 68, 69 are fixed relative to the chassis 1 of the spreader-lapper.
  • the axes of the rollers 34, 35 and 60, 61, 62, 63 are carried by a first movable main carriage 10, called the entry carriage.
  • the axes of the rollers 36, 37, 38 and 64 are carried by a second movable main carriage 14, called the exit carriage, and those of the rollers 41 and 67 are carried by auxiliary carriages 16, 18.
  • a movable auxiliary carriage 16, 18 For each closed path 20 to 31, 50 to 59 of the belts, a movable auxiliary carriage 16, 18 carries a guide roller 41, 67 around which this closed path makes a 180 degree turn.
  • the two auxiliary carriages 16, 18 have movements which compensate for those of the main carriages 10, 14 in order to keep the length of each of the closed paths 20 to 31, 50 to 59 substantially constant.
  • At least one of the rollers with fixed axis (for example the rollers numbered respectively 39 and 65) is rotated by known means not shown so as to circulate the belts 2, 5 along of their respective closed paths 20 to 31, 50 to 59 according to predetermined kinematic laws.
  • the directions of movement of the belts 2, 5 are indicated respectively by the arrows F2, F5 in FIGS. 2 to 4.
  • the closed paths 20 to 31, 50 to 59 are external to each other and adjacent to each other in a nip in which the sections of moving carpet numbered 23 and 53 in Figures 2 to 5 are located one against the other so as to pinch the web 4 between them.
  • the veil 4 is shown in dotted lines in FIG. 4 but is not represented in FIGS. 2 and 3 to show the superposition of the sections of carpet 23, 53.
  • the main carriages 10, 14 are located above the deck 8 and are movable in alternating translation in a horizontal direction and perpendicular to the axes of the rollers 32 to 43, 60 to 69.
  • the input carriage 10 (see also the more detailed view of FIG. 5) carries two guide rollers 34, 35 for the front belt 2 and situated inside its closed path 20 to 31. Upstream of the carriage input 10, the front belt 2 carrying the veil 4 follows the substantially horizontal section 21 coming from the front side 7. When arriving on the input carriage 10, the front belt 2 describes a first turn around the deflection roller 34 at an angle A between 0 and 90 degrees oriented downward to form the inclined section 22, then a second turn around the roller 35 at an angle B between 90 and 180 degrees to form the horizontal section 23 of the nip , directed towards the front side 7 of the spreader-lapper.
  • the total angular deviation A + B of the front belt 2 around the guide rollers 34, 35 carried by the input carriage 10 is equal to 180 degrees.
  • the input carriage 10 further carries four guide rollers 60, 61, 62, 63 relating to the rear belt 5, the rollers 60, 61, and 63 being internal to its closed path 50 to 59 and the roller 62, moreover large radius, called detour roller, being outside this closed path 50 to 59.
  • the rear belt 5, which does not carry the veil 4 follows the substantially horizontal section 59 coming from the side rear 9.
  • the rear belt 5 describes a first turn around the deflection roller 60 at an angle C between 0 and 90 degrees, oriented downwards to enter the section 50, then a second turn 180 degrees around the roller 61 to enter the section 51, then a third turn around the detour roller 62 at a negative angle (because the detour roller 62 is outside the closed path 50 to 59) greater than 180 degrees, and finally a fourth turn around the r ouleau 63 to enter the horizontal section 53 of the nip, directed towards the front side 7 of the spreader-lapper.
  • the total angular deviation of the rear belt 5 around the guide rollers 60, 61, 62, 63 carried by the input carriage 10 is zero.
  • the input carriage 10 comprises two sides 11 located on either side of the rollers 34, 35, 60, 61, 62, 63 which it carries. These rollers 34, 35, 60, 61, 62, 63 have their respective axes fixed at their ends on the sides 11. On their face opposite to the rollers 34, 35, 60, 61, 62, 63, the sides 11 of the carriage d input 10 carry wheels 13 pivoting about a horizontal axis and placed on a horizontal lateral ramp 12 secured to the chassis 1 of the spreader-lapper, so as to guide the input carriage 10 in its translational movement. A similar structure, visible in Figure 8, is provided to guide the output carriage 14 in its translational movement.
  • the two belts 2, 5 pass between two delivery nip rollers 38, 64 carried by the output carriage 14 (see FIGS. 2 to 4 and 8).
  • These two supply rollers 38, 64 have their respective axes in the same horizontal plane located above the deck 8.
  • the rear belt 5 makes a 180 degree turn to pass from the horizontal section 53 belonging to the nip to a horizontal section 54 extending immediately above the deck 8.
  • This horizontal section 54 passes under the input carriage 10 to join a guide roller with a fixed axis 65 located on the rear side 9 of the spreader-lapper.
  • the output carriage 14 carries two guide rollers 36, 37 (FIG. 8) relating to the front belt 2.
  • the front belt 2 describes a first turn around the deflection roller 36 at an angle between 0 and 30 degrees oriented upward to enter the section 24, then a second turn around the detour roller 37, located outside of its closed path 20 to 31, at a negative angle greater than 180 degrees to enter the horizontal section 25, and finally a third 180-degree turn around the pinch roller 38 to enter the horizontal section 26 extending immediately above the deck 8 to join a guide roller with fixed axis 39 located on the front side 7 of the spreader-lapper.
  • the total deflection of the front belt 2 around the guide rollers 36, 37, 38 carried by the output carriage 14 is zero.
  • the auxiliary carriages 16, 18 are movable in translation in a horizontal direction and perpendicular to the axes of the rollers 32 to 43, 60 to 69.
  • the auxiliary carriages 16, 18 are located in a lower passage 70 extending under the deck 8, to distance from the zones where the veil 4 and the formed ply 6 pass.
  • the lower passage 70 is separated from the deck 8 by a horizontal partition 72.
  • the auxiliary carriage 16 is provided to keep constant the length of the closed path 20 to 31 followed by the front belt 2. It carries a guide roller 41 around which the front belt 2 makes a 180 degree turn.
  • the front belt 2 is guided between the main carriages 10, 14 and the auxiliary carriage 16 by fixed axis guide rollers 32, 33, 39, 40, 42, 43 located on the front side 7 of the spreader-lapper.
  • the auxiliary carriage 18 is provided to keep constant the length of the closed path 50 to 59 followed by the rear belt 5. It carries a guide roller 67 around which the rear belt 5 makes a 180 degree turn.
  • the rear belt 5 is guided between the main carriages 10, 14 and the auxiliary carriage 18 by guide rollers with fixed axis 65, 66, 68, 69 located on the rear side 9 of the spreader-lapper.
  • Each auxiliary carriage 16, 18 comprises two sides 74, 78 located on either side of the roller 41, 67 which it carries (see FIGS. 6 and 7).
  • Each of these rollers 41, 67 has its axis carried at its ends on the flanks 74, 78 of the respective auxiliary carriage 16, 18.
  • the flanks 74, 78 carry pivoting wheels 75, 79 around a horizontal axis and which roll on horizontal lateral rails 76, 80 integral with the chassis 1 of the spreader-lapper so as to guide the auxiliary carriages 16, 18 in their translational movements.
  • the side rails 76, 80 extend inside the lower passage 70 on either side of the rollers 41, 67. As can be seen in the partial view of FIG.
  • the lower rails 76 support the auxiliary carriage 16 guiding the front belt 2 and the upper rails 80 support the auxiliary carriage 18 guiding the rear belt 5.
  • the wheels 79 of the carriage 18 placed on the upper rails 80 extend from the side angles 82 integral with the chassis 1 and forming a support for the partition 72 which delimits the upper part of the passage 70.
  • the spreader-lapper comprises driving pinions 85, 89 driven in rotation by means not shown and meshing respectively on belts notches 84, 88 symbolically represented in dashes in Figures 2 to 4.
  • Two toothed belts 84 extend on either side of the rollers and belts between the input carriage 10 and the auxiliary carriage 16, passing from the rear side 9 of the spreader-lapper. Between the carriages 10 and 16 to which they are fixed by their ends, the toothed belts 84 each bypass two return pinions 85, 86 (including the motor pinion 85) pivoting respectively around a fixed axis parallel to the axes of the rollers 32 to 43, 60 to 69.
  • the pinions 85, 86 are arranged so that the end sections of the toothed belts 84 are parallel to the direction of translation of the carriages 10, 16 to which they are respectively fixed.
  • two toothed belts 88 extend on either side of the rollers and belts between the output carriage 14 and the auxiliary carriage 18, passing on the front side 7 of the spreader-lapper. Between the carriages 14 and 18 to which they are fixed by their ends, the toothed belts 88 each bypass two return pinions 89, 90 (including the motor pinion 89) pivoting respectively around a fixed axis parallel to the axes of the rollers 32 to 43 , 60 to 69.
  • the pinions 89, 90 are arranged so that the end sections of the toothed belts 88 are parallel to the direction of translation of the carriages 14, 18 to which they are respectively fixed.
  • main carriages 10, 14 and auxiliary carriages 16, 18 are coupled in pairs 10, 16 and 14, 18 by means of cables 92, 96 shown symbolically in phantom in Figures 2 to 4. These cables 92, 96 are less extendable as rugs 2, 5.
  • Two cables 92 extend on either side of the rollers and belts between the input carriage 10 and its associated auxiliary carriage 16, passing on the front side 7 of the spreader-lapper. Between the carriages 10 and 16 to which they are fixed by their ends, the cables 92 each bypass two return pulleys 93, 94 pivoting respectively around a fixed axis parallel to the axes of the rollers 32 to 43, 60 to 69.
  • the pulleys 93 , 94 are arranged so that the end sections of the cables 92 are parallel to the direction of translation of the carriages 10, 16 to which they are respectively fixed.
  • Two cables 96 extend on either side of the rollers and belts between the output carriage 14 and its associated auxiliary carriage 18, passing from the rear side 9 of the spreader-lapper. Between the carriages 14 and 18 to which they are fixed by their ends, the cables 96 each bypass two return pulleys 97, 98 pivoting respectively around a fixed axis parallel to the axes of the rollers 32 to 43, 60 to 69.
  • the pulleys 97 , 98 are arranged so that the end sections of the cables 96 are parallel to the direction of translation of the carriages 14, 18 to which they are respectively fixed.
  • the drive of the belts 2, 5 is controlled by means of the driving rollers 39, 65 and that of the carriages 10, 14, 16, 18 by means of the driving pinions 85, 89 meshing on the toothed belts 84 , 88. It thus drives the carriages 10, 14, 16, 18 of synchronous translation movements back and forth.
  • the kinematic laws to be applied to the main carriages 10, 14 can for example be those taught by FR-B- 2 234 395.
  • FIGS. 2 and 3 The extreme positions of the reciprocating movements are shown diagrammatically in FIGS. 2 and 3 and an intermediate position in FIG. 4.
  • the outlet carriage 14 and its associated auxiliary carriage 18 follow back-and-forth movements of amplitude L carried out with speeds instantaneous having the same values and opposite directions, so that the length of the closed path 50 to 59 relative to the rear belt 5 is kept constant.
  • the input carriage 10 and its associated auxiliary carriage 16 follow back-and-forth movements of amplitude of the order of L / 2 carried out with instantaneous speeds having the same values and opposite directions, so that the length of the closed path 20 to 31 relative to the front belt 2 is kept constant.
  • the driving pinions 85, 89 are driven in the direction indicated by the arrows H in the figure. 3.
  • the toothed belts 84 then pull the auxiliary carriage 16 towards the rear side 9 and the toothed belts 88 pull the output carriage 14 towards the front side 7.
  • a traction force towards the front side 7 is transmitted to the entry carriage 10 via the cable 92 which couples it to the auxiliary carriage 16.
  • a tensile force towards the rear side 9 is transmitted to the auxiliary carriage 18 by via the cable 96 which couples it to the outlet carriage 14.
  • the traction forces mentioned, useful for synchronizing the movements of the associated carriages, are advantageously absorbed by the cables 92, 96 because they are less extensible than the belts 2, 5. This provides an important advantage compared to the spreader-lappers of the prior art, in which these tensile forces are mainly absorbed by the belts. As a result, carpets are less stressed and can be lighter in constitution while having improved durability.
  • the light construction of the belts is very advantageous because it reduces the inertia of the machine and facilitates movement in the curved regions of their closed paths, which improves the regularity of the transport of the web 4 in these regions.
  • the veil 4 from the card is placed on the inclined section 20 followed by the front belt 2 (see Figure 4). After deflection on the roller 33, it is transported horizontally on the section 21 to the input carriage 10. On this, the web 4 is first deflected by the roller 34 at the angle A between 0 and 90 degrees. The moderate value of the angle A prevents the veil from being disturbed when it is deflected by the roller 34. After being transported on the inclined section 22 of the front belt 2, the veil 4 bypasses the pinch roller 35. The pinch line defined between the rollers 35, 61 prevents the web 4 from peeling off the front belt under the action of centrifugal force.
  • angle B was too large (180 degrees or more), one could observe, for high rates, undesirable detachments of the web immediately upstream of the pinch roller 35 due to the excessive angular deflection or to a certain sagging of the front belt 2 upstream of the pinch roller 35. If the angle B was too small (90 degrees or less), the web 4 would not be transported reliably on the excessively inclined section 22 preceding the pinch roller 35. The prior clamping of the web 4 between the rollers 35, 61 and the appropriate value of the angle B thus ensure the best stability of the transport of the web, from which results a sheet 6 of optimal quality.
  • the roller 34 deflecting the veil 4 at the angle A before the nip is mounted on the input carriage 10. It will be understood that the roller 34 could have its axis fixed relative to the chassis 1 of the spreader-lapper. In this case, the angles A and B are variable, but the input carriage is lighter and the roller 34 contributes to supporting the belt 2 upstream of the input carriage.
  • the veil 4 After having traversed the nip 23, 53 the veil 4 reaches the outlet carriage 14 which deposits it by alternating folds on the deck 8 to form the ply 6.
  • the formed sheet 6 is, to a certain extent, sheltered from the air currents created by the reciprocating movements of the carriages 10, 14, 16, 18 due to the presence of the sections of carpet 26, 54 located immediately above the deck 8.
  • the presence of the vertical sections 27, 55 adjacent to these sections 26, 54 also contributes to preventing lateral air currents from reaching the level of the sheet formed 6.
  • the air currents caused by their movements remain essentially confined inside the passage lower 70, at a distance from the zones through which the veil 4 and the ply 6 pass. Consequently neither the veil 4 nor the ply 6 are disturbed by these air currents and the homogeneity of the formed ply 6 is improved, in particular when the spreader-lapper operates at high speed.
  • the auxiliary carriages can be located in separate lower passages, it is advantageous, to reduce the space requirement, to provide a single lower passage 70 in which the two auxiliary carriages 16 move. , 18.
  • the auxiliary carriages 16, 18 are placed on rails 76, 80 located at different heights in the lower passage 70, the transmission belts 84, 88 and the coupling cables 92, 96 are also arranged at different heights, and they do not interfere in operation.
  • the lower passage 70 has a length at least equal to 3L / 2, that is to say the sum of the amplitudes of the reciprocating movements of the main carriages 10, 14 (or the auxiliary carriages 16, 18) .

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Nonwoven Fabrics (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Cereal-Derived Products (AREA)

Abstract

PCT No. PCT/FR92/00472 Sec. 371 Date Feb. 1, 1993 Sec. 102(e) Date Feb. 1, 1993 PCT Filed May 27, 1992 PCT Pub. No. WO92/21802 PCT Pub. Date Dec. 10, 1992.A web of fibers (4) is conveyed by conveyor-belts (2, 5) which pass around rollers (32 to 43, 60 to 69). Some of these rollers are carried by main carriages (10, 14) which are capable of displacement in reciprocating motion above an apron (8) which moves in a direction parallel to the axes of the rollers and collects the web (4) in the form of a lap. Auxiliary carriages (16, 18) are provided for maintaining the length of the paths of the conveyor-belts (2, 5) at a constant value in spite of the reciprocating movements of the main carriages (10, 14). Each auxiliary carriage (16, 18) is located within a bottom passageway (70) which extends beneath the apron (8) and is separated from the apron by at least one partition-wall (72). The invention is applicable to the manufacture of nonwoven fabrics.

Description

La présente invention concerne un étaleur nappeur pour transformer par repliage un voile en une nappe.The present invention relates to a lapper spreader for transforming by folding a web into a web.

On connaît par exemple d'après le FR - B - 2 553 102 une telle machine dans laquelle un voile, issu d'une carde, est d'abord transporté par un premier tapis, dit tapis avant, jusqu'à une zone de pincement où il est maintenu entre le premier et un deuxième tapis et transporté jusqu'à un chariot de sortie. Le va-et-vient du chariot de sortie au-dessus d'un tablier récepteur provoque un dépôt du voile qu'il débite, par plis alternés, en accordéon, sur le tablier. Comme le tablier se déplace dans une direction parallèle aux axes des rouleaux de guidage portés par le chariot de sortie, les plis successifs sont décalés le long de cette direction et le voile vient former sur le tablier une nappe continue dont les bords latéraux sont définis par les plis. Le début de la zone de pincement est défini en position mobile par un chariot d'entrée qui effectue un mouvement de va-et-vient destiné à rendre compatibles la vitesse d'admission du voile dans l'étaleur et la vitesse de dévidage du voile par le chariot de sortie malgré les mouvements de va-et-vient de ce dernier. Ainsi, le voile, qui est de constitution fragile n'est perturbé ni par entassement, ni par étirement, ni par frottement.We know for example from FR - B - 2 553 102 such a machine in which a veil, coming from a carding machine, is first transported by a first mat, called front mat, to a pinch zone where it is held between the first and a second mat and transported to an exit cart. The back-and-forth movement of the exit carriage above a receiving apron causes a deposition of the veil which it delivers, by alternating folds, in accordion, on the apron. As the apron moves in a direction parallel to the axes of the guide rollers carried by the output carriage, the successive folds are offset along this direction and the web forms on the apron a continuous sheet whose lateral edges are defined by the folds. The start of the pinch zone is defined in the mobile position by an input carriage which moves back and forth intended to make the speed of admission of the web into the spreader and the speed of unwinding of the web compatible. by the exit carriage despite the back and forth movements of the latter. Thus, the veil, which is of fragile constitution is disturbed neither by piling, nor by stretching, nor by friction.

Dans des machines de ce genre, il y a lieu de maintenir constante, malgré les déplacements en va-et-vient des chariots, la longueur développée des trajets fermés suivis par les tapis.In machines of this kind, it is necessary to maintain constant, despite the back and forth movements of the carriages, the developed length of the closed paths followed by the carpets.

Dans certaines réalisations, le va-et-vient du chariot d'entrée est compensé par le va-et-vient contraire du chariot de sortie et vice-versa grâce à une disposition appropriée des rouleaux de guidage (voir par exemple le FR - B - 2 553 102).In certain embodiments, the comings and goings of the input carriage is compensated by the opposite comings and goings of the output carriage and vice versa thanks to an appropriate arrangement of the guide rollers (see for example FR - B - 2,553,102).

Dans d'autres réalisations (voir FR-B-2 234 395, US-A- 1 886 919 ou FR-A- 2 373 095) sont prévus un ou plusieurs chariots auxiliaires qui effectuent également des mouvements de va-et-vient en translation pour sélectivement allonger ou raccourcir les tapis en dehors de la zone de pincement et compenser ainsi les variations de longueur de la zone de pincement.In other embodiments (see FR-B-2 234 395, US-A- 1 886 919 or FR-A- 2 373 095) there are provided one or more auxiliary carriages which also perform back and forth movements. translation to selectively lengthen or shorten the belts outside the nip area and thus compensate for variations in length of the nip area.

La présente demande concerne plus particulièrement ce second type de réalisation.The present application relates more particularly to this second type of embodiment.

On a constaté que les étaleurs-nappeurs de ce type posent des difficultés lorsqu'ils fonctionnent à des vitesses élevées, désirées pour augmenter les cadences de production. Le mouvement alterné des chariots auxiliaires provoque alors des courants d'air relativement violents qui tendent à disperser le voile transporté sur le tapis avant en amont du chariot d'entrée, ce qui peut se traduire par des défauts d'homogénéité de la nappe produite, voire par des bourrages du voile dans la zone de pincement.It has been found that spreader-lappers of this type pose difficulties when operating at high speeds, desired to increase production rates. The alternating movement of the auxiliary carriages then causes relatively violent air currents which tend to disperse the veil transported on the front belt upstream of the entry carriage, which can result in defects in the homogeneity of the sheet produced, or by jamming of the veil in the pinch area.

Dans l'étaleur-nappeur décrit dans le US - A - 1 886 919, les chariots auxiliaires sont montés coulissants à l'intérieur de la boucle fermée décrite par le tablier recevant la nappe. Leurs mouvements de va-et-vient provoquent donc des courants d'air au voisinage de la nappe déposée sur le tablier de sorte que cet étaleur-nappeur ne peut pas produire une nappe régulière à des vitesses relativement élevées.In the spreader-lapper described in US - A - 1 886 919, the auxiliary carriages are slidably mounted inside the closed loop described by the deck receiving the tablecloth. Their back-and-forth movements therefore cause air currents in the vicinity of the ply deposited on the deck so that this spreader-lapper cannot produce a regular ply at relatively high speeds.

Dans l'étaleur-nappeur décrit dans le FR-A-2 373 095, le chariot auxiliaire se déplace au-dessus du chariot d'entrée. Cette structure réduit l'effet perturbateur du mouvement du chariot auxiliaire sur la nappe formée, en comparaison avec le US-A- 1 886 919. Mais cet effet perturbateur s'exerce en revanche sur le voile fourni à l'entrée de la machine. Il en résulte le même inconvénient : la régularité de la nappe formée en sortie de l'étaleur est médiocre, particulièrement à grande vitesse.In the spreader-lapper described in FR-A-2 373 095, the auxiliary carriage moves above the input carriage. This structure reduces the disturbing effect of the movement of the auxiliary carriage on the sheet formed, in comparison with US-A-1 886 919. However, this disturbing effect is exerted on the veil provided at the entrance to the machine. This results in the same drawback: the regularity of the sheet formed at the outlet spreader is poor, especially at high speed.

L'un des buts de la présente invention est de résoudre ces difficultés et de présenter un étaleur-nappeur produisant une nappe régulière, même à grande vitesse.One of the aims of the present invention is to solve these difficulties and to present a spreader-lapper producing a regular sheet, even at high speed.

L'étaleur-nappeur conforme à la présente invention comprend deux tapis suivant chacun un trajet fermé et associés à des rouleaux pour leur guidage et leur entraînement respectifs, les trajets fermés étant extérieurs l'un à l'autre et adjacents l'un à l'autre dans une zone de pincement délimitée par des rouleaux de guidage portés par deux chariots principaux mobiles en translation suivant une direction horizontale et perpendiculaire aux axes des rouleaux, des moyens compensateurs, comprenant au moins un chariot auxiliaire mobile en translation perpendiculairement aux axes des rouleaux, pour maintenir sensiblement constante la longueur de chacun des trajets fermés, chaque trajet fermé présentant un virage à 180 degrés autour d'au moins un rouleau de guidage porté par un chariot auxiliaire, des moyens pour amener le voile à l'entrée de la zone de pincement, un tablier mobile dans une direction parallèle aux axes des rouleaux et recevant le voile à sa sortie de la zone de pincement, et des moyens d'entraînement pour appliquer des mouvements de translation en va-et-vient aux chariots principaux et aux moyens compensateurs.The spreader-lapper according to the present invention comprises two belts each following a closed path and associated with rollers for their respective guidance and drive, the closed paths being external to each other and adjacent to each other. other in a nip defined by guide rollers carried by two main carriages movable in translation in a horizontal direction and perpendicular to the axes of the rollers, compensating means, comprising at least one auxiliary carriage movable in translation perpendicular to the axes of the rollers , to keep the length of each of the closed paths substantially constant, each closed path having a 180 degree turn around at least one guide roller carried by an auxiliary carriage, means for bringing the veil to the entrance of the zone pinch, an apron movable in a direction parallel to the axes of the rollers and receiving the veil at its exit from the pinch zone, and drive means for applying back and forth translation movements to the main carriages and to the compensating means.

Suivant l'invention, cet étaleur-nappeur est caractérisé en ce que chaque chariot auxiliaire est situé dans un passage inférieur s'étendant sous le tablier et séparé de celui-ci par des moyens tels qu'une cloison pour contrarier la propagation vers le voile et/ou la nappe en formation des courants d'air générés notamment par les chariots auxiliaires.According to the invention, this spreader-lapper is characterized in that each auxiliary carriage is situated in a lower passage extending under the apron and separated from it by means such as a partition to counter the propagation towards the veil and / or the sheet in formation of the air currents generated in particular by the auxiliary carriages.

Grâce à cette disposition, les courants d'air provoqués par le va-et-vient des chariots auxiliaires ne parviennent pas au niveau du voile ou de la nappe, ou du moins y parviennent sensiblement atténués car ils restent essentiellement confinés à l'intérieur du passage inférieur. Par conséquent, ces mouvements n'affectent pratiquement pas la régularité du transport du voile et la nappe formée a donc une homogénéité améliorée.Thanks to this arrangement, the air currents caused by the back and forth movement of the auxiliary carriages do not do not reach the level of the veil or the tablecloth, or at least arrive there substantially attenuated because they remain essentially confined inside the underpass. Consequently, these movements practically do not affect the regularity of the transport of the veil and the sheet formed therefore has improved homogeneity.

D'autres particularités et avantages de la présente invention apparaîtront dans la description détaillée ci-dessous d'un exemple de réalisation. Aux dessins annexés :

  • la figure 1 est une vue extérieure en perspective d'un étaleur-nappeur ;
  • les figures 2 à 4 sont des vues schématiques en élévation d'un étaleur-nappeur conforme à l'invention dans trois positions différentes ;
  • la figure 5 est une vue en élévation à plus grande échelle représentant avec davantage de détail le chariot d'entrée de l'étaleur-nappeur des figures 2 à 4 ;
  • la figure 6 est une vue en plan prise selon le plan VI-VI indiqué aux figures 4 et 7 ; et
  • la figure 7 est une vue en plan partielle prise selon le plan VII-VII indiqué aux figures 4 et 6 ;
  • la figure 8 est une vue analogue à la figure 5 montrant le chariot de sortie de l'étaleur-nappeur.
Other features and advantages of the present invention will appear in the detailed description below of an exemplary embodiment. In the accompanying drawings:
  • Figure 1 is an external perspective view of a spreader-lapper;
  • Figures 2 to 4 are schematic elevational views of a spreader-lapper according to the invention in three different positions;
  • Figure 5 is an elevational view on a larger scale showing in more detail the input carriage of the spreader-lapper of Figures 2 to 4;
  • Figure 6 is a plan view taken along the plane VI-VI shown in Figures 4 and 7; and
  • Figure 7 is a partial plan view taken along the plane VII-VII shown in Figures 4 and 6;
  • Figure 8 is a view similar to Figure 5 showing the output carriage of the spreader-lapper.

L'étaleur-nappeur représenté en perspective à la figure 1 comprend un premier tapis 2, dit tapis avant qui recueille le voile de fibres 4, par exemple issu d'une carde non représentée, et le transporte dans l'enceinte 1 où il est transformé par repliage en une nappe 6 transportée par un tablier 8 à l'extérieur de l'enceinte 1. Le tablier 8 transporte la nappe formée 6, par exemple jusqu'à une aiguilleteuse non représentée. Les sens de transport du voile 4 et de la nappe 6 sont respectivement indiqués à la figure 1 par les flèches F et K. A des fins de référence, on appellera "côté avant" de l'étaleur-nappeur le côté 7 adjacent à la face par laquelle pénètre le voile 4 et "côté arrière" de l'étaleur-nappeur le côté 9 opposé au côté avant 7.The spreader-lapper shown in perspective in FIG. 1 comprises a first mat 2, said front mat which collects the veil of fibers 4, for example from a card not shown, and transports it into the enclosure 1 where it is transformed by folding into a ply 6 transported by an apron 8 outside the enclosure 1. The apron 8 transports the formed ply 6, for example to a needling machine not shown. The directions of transport of the web 4 and of the web 6 are respectively indicated in FIG. 1 by the arrows F and K. For reference purposes, the side 7 adjacent to the face through which penetrates the web 4 and "rear side" of the spreader-lapper the side 9 opposite to the front side 7.

L'intérieur de l'étaleur-nappeur est représenté schématiquement sur les vues en élévation des figures 2 à 4, prises selon un plan Q perpendiculaire à la direction de transport de la nappe 6 par le tablier 8.The interior of the spreader-lapper is shown schematically in the elevation views of FIGS. 2 to 4, taken along a plane Q perpendicular to the direction of transport of the ply 6 by the deck 8.

Associé au tapis avant 2, l'étaleur-nappeur comprend un second tapis 5, dit tapis arrière. Les tapis 2 et 5, représentés en traits pleins aux figures 2 à 4, ont la même largeur et ont leurs bords latéraux dans les mêmes plans parallèles au plan des figures 2 à 4. Le tapis avant 2 suit un trajet fermé constitué de tronçons 20 à 31 délimités par des rouleaux de guidage cylindriques 32 à 43. Le tapis arrière 5 suit un trajet fermé constitué de tronçons 50 à 59 délimités par des rouleaux de guidage cylindriques 60 à 69.Associated with the front mat 2, the spreader-lapper comprises a second mat 5, called the rear mat. The belts 2 and 5, shown in solid lines in FIGS. 2 to 4, have the same width and have their lateral edges in the same planes parallel to the plane of FIGS. 2 to 4. The front carpet 2 follows a closed path consisting of sections 20 to 31 delimited by cylindrical guide rollers 32 to 43. The rear belt 5 follows a closed path consisting of sections 50 to 59 delimited by cylindrical guide rollers 60 to 69.

Les rouleaux de guidage 32 à 43, 60 à 69 sont montés pivotants autour d'axes respectifs perpendiculaires au plan des figures 2 à 4, c'est-à-dire parallèles à la direction du mouvement du tablier 8. Les axes des rouleaux 32, 33, 39, 40, 42, 43 et 65, 66, 68, 69 sont fixes par rapport au châssis 1 de l'étaleur-nappeur. Les axes des rouleaux 34, 35 et 60, 61, 62, 63 sont portés par un premier chariot principal mobile 10, dit chariot d'entrée. Les axes des rouleaux 36, 37, 38 et 64 sont portés par un second chariot principal mobile 14, dit chariot de sortie, et ceux des rouleaux 41 et 67 sont portés par des chariots auxiliaires 16, 18.The guide rollers 32 to 43, 60 to 69 are pivotally mounted around respective axes perpendicular to the plane of Figures 2 to 4, that is to say parallel to the direction of movement of the deck 8. The axes of the rollers 32 , 33, 39, 40, 42, 43 and 65, 66, 68, 69 are fixed relative to the chassis 1 of the spreader-lapper. The axes of the rollers 34, 35 and 60, 61, 62, 63 are carried by a first movable main carriage 10, called the entry carriage. The axes of the rollers 36, 37, 38 and 64 are carried by a second movable main carriage 14, called the exit carriage, and those of the rollers 41 and 67 are carried by auxiliary carriages 16, 18.

Pour chaque trajet fermé 20 à 31, 50 à 59 des tapis, un chariot auxiliaire mobile 16, 18 porte un rouleau de guidage 41, 67 autour duquel ce trajet fermé effectue un virage à 180 degrés. Les deux chariots auxiliaires 16, 18 ont des mouvements qui compensent ceux des chariots principaux 10, 14 pour maintenir sensiblement constante la longueur de chacun des trajets fermés 20 à 31, 50 à 59.For each closed path 20 to 31, 50 to 59 of the belts, a movable auxiliary carriage 16, 18 carries a guide roller 41, 67 around which this closed path makes a 180 degree turn. The two auxiliary carriages 16, 18 have movements which compensate for those of the main carriages 10, 14 in order to keep the length of each of the closed paths 20 to 31, 50 to 59 substantially constant.

Pour chaque tapis 2, 5, au moins l'un des rouleaux à axe fixe (par exemple les rouleaux numérotés respectivement 39 et 65) est entraîné en rotation par des moyens connus non représentés de façon à faire circuler les tapis 2, 5 le long de leurs trajets fermés respectifs 20 à 31, 50 à 59 selon des lois cinématiques prédéterminées. Les sens de circulation des tapis 2, 5 sont indiqués respectivement par les flèches F2, F5 aux figures 2 à 4.For each belt 2, 5, at least one of the rollers with fixed axis (for example the rollers numbered respectively 39 and 65) is rotated by known means not shown so as to circulate the belts 2, 5 along of their respective closed paths 20 to 31, 50 to 59 according to predetermined kinematic laws. The directions of movement of the belts 2, 5 are indicated respectively by the arrows F2, F5 in FIGS. 2 to 4.

Les trajets fermés 20 à 31, 50 à 59 sont extérieurs l'un à l'autre et adjacents l'un à l'autre dans une zone de pincement dans laquelle les tronçons de tapis en mouvement numérotés 23 et 53 aux figures 2 à 5 sont situés l'un contre l'autre de façon à pincer le voile 4 entre eux. Le voile 4 est représenté en pointillés à la figure 4 mais n'est pas représenté aux figures 2 et 3 pour montrer la superposition des tronçons de tapis 23, 53.The closed paths 20 to 31, 50 to 59 are external to each other and adjacent to each other in a nip in which the sections of moving carpet numbered 23 and 53 in Figures 2 to 5 are located one against the other so as to pinch the web 4 between them. The veil 4 is shown in dotted lines in FIG. 4 but is not represented in FIGS. 2 and 3 to show the superposition of the sections of carpet 23, 53.

Les tronçons horizontaux adjacents 23, 53 des trajets fermés suivis par les deux tapis 2, 5 dans la zone de pincement sont délimités, à l'entrée de la zone de pincement, par des rouleaux de guidage 35, 61 portés par le chariot d'entrée 10, et, à la sortie de la zone de pincement, par des rouleaux de guidage 38, 64 portés par le chariot de sortie 14.The adjacent horizontal sections 23, 53 of the closed paths followed by the two belts 2, 5 in the nip area are delimited, at the entrance to the nip area, by guide rollers 35, 61 carried by the carriage. inlet 10, and, at the outlet of the nip, by guide rollers 38, 64 carried by the outlet carriage 14.

Les chariots principaux 10, 14 sont situés au-dessus du tablier 8 et sont mobiles en translation alternée suivant une direction horizontale et perpendiculaire aux axes des rouleaux 32 à 43, 60 à 69.The main carriages 10, 14 are located above the deck 8 and are movable in alternating translation in a horizontal direction and perpendicular to the axes of the rollers 32 to 43, 60 to 69.

Le chariot d'entrée 10 (voir aussi la vue plus détaillée de la figure 5) porte deux rouleaux de guidage 34, 35 pour le tapis avant 2 et situés à l'intérieur de son trajet fermé 20 à 31. En amont du chariot d'entrée 10, le tapis avant 2 portant le voile 4 suit le tronçon sensiblement horizontal 21 en provenance du côté avant 7. En parvenant sur le chariot d'entrée 10, le tapis avant 2 décrit un premier virage autour du rouleau de renvoi 34 suivant un angle A compris entre O et 90 degrés orienté vers le bas pour constituer le tronçon incliné 22, puis un second virage autour du rouleau 35 suivant un angle B compris entre 90 et 180 degrés pour constituer le tronçon horizontal 23 de la zone de pincement, dirigé vers le côté avant 7 de l'étaleur-nappeur. La déviation angulaire totale A + B du tapis avant 2 autour des rouleaux de guidage 34, 35 portés par le chariot d'entrée 10 est égale à 180 degrés.The input carriage 10 (see also the more detailed view of FIG. 5) carries two guide rollers 34, 35 for the front belt 2 and situated inside its closed path 20 to 31. Upstream of the carriage input 10, the front belt 2 carrying the veil 4 follows the substantially horizontal section 21 coming from the front side 7. When arriving on the input carriage 10, the front belt 2 describes a first turn around the deflection roller 34 at an angle A between 0 and 90 degrees oriented downward to form the inclined section 22, then a second turn around the roller 35 at an angle B between 90 and 180 degrees to form the horizontal section 23 of the nip , directed towards the front side 7 of the spreader-lapper. The total angular deviation A + B of the front belt 2 around the guide rollers 34, 35 carried by the input carriage 10 is equal to 180 degrees.

Le chariot d'entrée 10 porte en outre quatre rouleaux de guidage 60, 61, 62, 63 relatifs au tapis arrière 5, les rouleaux 60, 61, et 63 étant intérieurs à son trajet fermé 50 à 59 et le rouleau 62, de plus grand rayon, dit rouleau de détour, étant extérieur à ce trajet fermé 50 à 59. En amont du chariot d'entrée 10, le tapis arrière 5, qui ne porte pas le voile 4, suit le tronçon sensiblement horizontal 59 en provenance du côté arrière 9. En parvenant sur le chariot d'entrée 10, le tapis arrière 5 décrit un premier virage autour du rouleau de renvoi 60 suivant un angle C compris entre 0 et 90 degrés, orienté vers le bas pour entrer dans le tronçon 50, puis un second virage à 180 degrés autour du rouleau 61 pour entrer dans le tronçon 51, puis un troisième virage autour du rouleau de détour 62 suivant un angle négatif (car le rouleau de détour 62 est extérieur au trajet fermé 50 à 59) supérieur à 180 degrés, et enfin un quatrième virage autour du rouleau 63 pour entrer dans le tronçon horizontal 53 de la zone de pincement, dirigé vers le côté avant 7 de l'étaleur-nappeur. La déviation angulaire totale du tapis arrière 5 autour des rouleaux de guidage 60, 61, 62, 63 portés par le chariot d'entrée 10 est nulle.The input carriage 10 further carries four guide rollers 60, 61, 62, 63 relating to the rear belt 5, the rollers 60, 61, and 63 being internal to its closed path 50 to 59 and the roller 62, moreover large radius, called detour roller, being outside this closed path 50 to 59. Upstream of the entry carriage 10, the rear belt 5, which does not carry the veil 4, follows the substantially horizontal section 59 coming from the side rear 9. Arriving on the input carriage 10, the rear belt 5 describes a first turn around the deflection roller 60 at an angle C between 0 and 90 degrees, oriented downwards to enter the section 50, then a second turn 180 degrees around the roller 61 to enter the section 51, then a third turn around the detour roller 62 at a negative angle (because the detour roller 62 is outside the closed path 50 to 59) greater than 180 degrees, and finally a fourth turn around the r ouleau 63 to enter the horizontal section 53 of the nip, directed towards the front side 7 of the spreader-lapper. The total angular deviation of the rear belt 5 around the guide rollers 60, 61, 62, 63 carried by the input carriage 10 is zero.

On voit à la figure 5 que les deux tapis 2, 5, ainsi que le voile 4 passant entre ceux-ci, sont pincés selon une ligne de pincement définie entre les deux rouleaux 35, 61 et constituant l'entrée de la zone de pincement. Ces deux rouleaux de pincement 35, 61 ont leurs axes respectifs situés dans un même plan horizontal P. En contournant le rouleau 63, situé sur le chariot d'entrée 10 sous le plan horizontal P, le tapis arrière 5 est soutenu et rejoint tangentiellement le tapis avant 2 dans la zone de pincement 23, 53. Le voile 4 s'engage dans la zone de pincement 23, 53 après avoir été transporté sur les tronçons 20, 21, 22 du trajet du tapis avant 2 et être passé entre les tapis 2, 5 pincés entre les rouleaux 35, 61 selon la ligne de pincement. Ces rouleaux de pincement 35, 61 peuvent être poussés élastiquement l'un vers l'autre par des moyens de rappel connus (non représentés).It can be seen in FIG. 5 that the two belts 2, 5, as well as the web 4 passing between them, are pinched along a pinch line defined between the two rollers 35, 61 and constituting the entrance to the zone of pinching. These two pinch rollers 35, 61 have their respective axes located in the same horizontal plane P. By circumventing the roller 63, located on the input carriage 10 under the horizontal plane P, the rear belt 5 is supported and tangentially joined the front belt 2 in the pinch zone 23, 53. The web 4 engages in the pinch zone 23, 53 after having been transported on the sections 20, 21, 22 of the path of the front belt 2 and having passed between the belts 2, 5 pinched between the rollers 35, 61 along the nip line. These pinch rollers 35, 61 can be pushed elastically towards one another by known return means (not shown).

Le chariot d'entrée 10 comprend deux flancs 11 situés de part et d'autre des rouleaux 34, 35, 60, 61, 62, 63 qu'il porte. Ces rouleaux 34, 35, 60, 61, 62, 63 ont leurs axes respectifs fixés à leurs extrémités sur les flancs 11. Sur leur face opposée aux rouleaux 34, 35, 60, 61, 62, 63, les flancs 11 du chariot d'entrée 10 portent des roues 13 pivotantes autour d'un axe horizontal et posées sur une rampe latérale horizontale 12 solidaire du châssis 1 de l'étaleur-nappeur, de façon à guider le chariot d'entrée 10 dans son mouvement de translation. Une structure analogue, visible à la figure 8, est prévue pour guider le chariot de sortie 14 dans son mouvement de translation.The input carriage 10 comprises two sides 11 located on either side of the rollers 34, 35, 60, 61, 62, 63 which it carries. These rollers 34, 35, 60, 61, 62, 63 have their respective axes fixed at their ends on the sides 11. On their face opposite to the rollers 34, 35, 60, 61, 62, 63, the sides 11 of the carriage d input 10 carry wheels 13 pivoting about a horizontal axis and placed on a horizontal lateral ramp 12 secured to the chassis 1 of the spreader-lapper, so as to guide the input carriage 10 in its translational movement. A similar structure, visible in Figure 8, is provided to guide the output carriage 14 in its translational movement.

A la sortie de la zone de pincement 23, 53, les deux tapis 2, 5 passent entre deux rouleaux de pincement débiteurs 38, 64 portés par le chariot de sortie 14 (voir figures 2 à 4 et 8). Ces deux rouleaux débiteurs 38, 64 ont leurs axes respectifs dans un même plan horizontal situé au-dessus du tablier 8.At the exit from the nip 23, 53, the two belts 2, 5 pass between two delivery nip rollers 38, 64 carried by the output carriage 14 (see FIGS. 2 to 4 and 8). These two supply rollers 38, 64 have their respective axes in the same horizontal plane located above the deck 8.

Autour du rouleau de pincement 64, le tapis arrière 5 effectue un virage à 180 degrés pour passer du tronçon horizontal 53 appartenant à la zone de pincement à un tronçon horizontal 54 s'étendant immédiatement au-dessus du tablier 8. Ce tronçon horizontal 54 passe sous le chariot d'entrée 10 pour rejoindre un rouleau de guidage à axe fixe 65 situé du côté arrière 9 de l'étaleur-nappeur.Around the nip roller 64, the rear belt 5 makes a 180 degree turn to pass from the horizontal section 53 belonging to the nip to a horizontal section 54 extending immediately above the deck 8. This horizontal section 54 passes under the input carriage 10 to join a guide roller with a fixed axis 65 located on the rear side 9 of the spreader-lapper.

En plus du rouleau de pincement 38, le chariot de sortie 14 porte deux rouleaux de guidage 36, 37 (figure 8) relatifs au tapis avant 2. A l'extrémité du tronçon horizontal 23 appartenant à la zone de pincement, le tapis avant 2 décrit un premier virage autour du rouleau de renvoi 36 suivant un angle compris entre 0 et 30 degrés orienté vers le haut pour entrer dans le tronçon 24, puis un second virage autour du rouleau de détour 37, situé à l'extérieur de son trajet fermé 20 à 31, suivant un angle négatif supérieur à 180 degrés pour entrer dans le tronçon horizontal 25, et enfin un troisième virage à 180 degrés autour du rouleau de pincement 38 pour entrer dans le tronçon horizontal 26 s'étendant immédiatement au-dessus du tablier 8 pour rejoindre un rouleau de guidage à axe fixe 39 situé du côté avant 7 de l'étaleur-nappeur. La déviation totale du tapis avant 2 autour des rouleaux de guidage 36, 37, 38 portés par le chariot de sortie 14 est nulle.In addition to the pinch roller 38, the output carriage 14 carries two guide rollers 36, 37 (FIG. 8) relating to the front belt 2. At the end of the horizontal section 23 belonging to the pinch zone, the front belt 2 describes a first turn around the deflection roller 36 at an angle between 0 and 30 degrees oriented upward to enter the section 24, then a second turn around the detour roller 37, located outside of its closed path 20 to 31, at a negative angle greater than 180 degrees to enter the horizontal section 25, and finally a third 180-degree turn around the pinch roller 38 to enter the horizontal section 26 extending immediately above the deck 8 to join a guide roller with fixed axis 39 located on the front side 7 of the spreader-lapper. The total deflection of the front belt 2 around the guide rollers 36, 37, 38 carried by the output carriage 14 is zero.

Les chariots auxiliaires 16, 18 sont mobiles en translation suivant une direction horizontale et perpendiculaire aux axes des rouleaux 32 à 43, 60 à 69. Les chariots auxiliaires 16, 18 sont situés dans un passage inférieur 70 s'étendant sous le tablier 8, à distance des zones ou passent le voile 4 et la nappe formée 6. Le passage inférieur 70 est séparé du tablier 8 par une cloison horizontale 72.The auxiliary carriages 16, 18 are movable in translation in a horizontal direction and perpendicular to the axes of the rollers 32 to 43, 60 to 69. The auxiliary carriages 16, 18 are located in a lower passage 70 extending under the deck 8, to distance from the zones where the veil 4 and the formed ply 6 pass. The lower passage 70 is separated from the deck 8 by a horizontal partition 72.

Le chariot auxiliaire 16 est prévu pour maintenir constante la longueur du trajet fermé 20 à 31 suivi par le tapis avant 2. Il porte un rouleau de guidage 41 autour duquel le tapis avant 2 effectue un virage à 180 degrés. Le tapis avant 2 est guidé entre les chariots principaux 10, 14 et le chariot auxiliaire 16 par des rouleaux de guidage à axe fixe 32, 33, 39, 40, 42, 43 situés du côté avant 7 de l'étaleur-nappeur.The auxiliary carriage 16 is provided to keep constant the length of the closed path 20 to 31 followed by the front belt 2. It carries a guide roller 41 around which the front belt 2 makes a 180 degree turn. The front belt 2 is guided between the main carriages 10, 14 and the auxiliary carriage 16 by fixed axis guide rollers 32, 33, 39, 40, 42, 43 located on the front side 7 of the spreader-lapper.

Le chariot auxiliaire 18 est prévu pour maintenir constante la longueur du trajet fermé 50 à 59 suivi par le tapis arrière 5. Il porte un rouleau de guidage 67 autour duquel le tapis arrière 5 effectue un virage à 180 degrés. Le tapis arrière 5 est guidé entre les chariots principaux 10, 14 et le chariot auxiliaire 18 par des rouleaux de guidage à axe fixe 65, 66, 68, 69 situés du côté arrière 9 de l'étaleur-nappeur.The auxiliary carriage 18 is provided to keep constant the length of the closed path 50 to 59 followed by the rear belt 5. It carries a guide roller 67 around which the rear belt 5 makes a 180 degree turn. The rear belt 5 is guided between the main carriages 10, 14 and the auxiliary carriage 18 by guide rollers with fixed axis 65, 66, 68, 69 located on the rear side 9 of the spreader-lapper.

Chaque chariot auxiliaire 16, 18 comprend deux flancs 74, 78 situés de part et d'autre du rouleau 41, 67 qu'il porte (voir figures 6 et 7). Chacun de ces rouleaux 41, 67 a son axe porté à ses extrémités sur les flancs 74, 78 du chariot auxiliaire respectif 16, 18. Sur leur face opposée au rouleau 41, 67, les flancs 74, 78 portent des roues 75, 79 pivotantes autour d'un axe horizontal et qui roulent sur des rails latéraux horizontaux 76, 80 solidaires du châssis 1 de l'étaleur-nappeur de façon à guider les chariots auxiliaires 16, 18 dans leurs mouvements de translation. Les rails latéraux 76, 80 s'étendent à l'intérieur du passage inférieur 70 de part et d'autre des rouleaux 41, 67. Comme on le voit à la vue partielle de la figure 7, ils sont situés à des hauteurs différentes. Dans l'exemple représenté, les rails inférieurs 76 supportent le chariot auxiliaire 16 guidant le tapis avant 2 et les rails supérieurs 80 supportent le chariot auxiliaire 18 guidant le tapis arrière 5. Au-dessus des roues 79 du chariot 18 posé sur les rails supérieurs 80 s'étendent des cornières latérales 82 solidaires du châssis 1 et formant support pour la cloison 72 qui délimite la partie supérieure du passage 70.Each auxiliary carriage 16, 18 comprises two sides 74, 78 located on either side of the roller 41, 67 which it carries (see FIGS. 6 and 7). Each of these rollers 41, 67 has its axis carried at its ends on the flanks 74, 78 of the respective auxiliary carriage 16, 18. On their face opposite to the roller 41, 67, the flanks 74, 78 carry pivoting wheels 75, 79 around a horizontal axis and which roll on horizontal lateral rails 76, 80 integral with the chassis 1 of the spreader-lapper so as to guide the auxiliary carriages 16, 18 in their translational movements. The side rails 76, 80 extend inside the lower passage 70 on either side of the rollers 41, 67. As can be seen in the partial view of FIG. 7, they are located at different heights. In the example shown, the lower rails 76 support the auxiliary carriage 16 guiding the front belt 2 and the upper rails 80 support the auxiliary carriage 18 guiding the rear belt 5. Above the wheels 79 of the carriage 18 placed on the upper rails 80 extend from the side angles 82 integral with the chassis 1 and forming a support for the partition 72 which delimits the upper part of the passage 70.

Pour entraîner les chariots principaux 10, 14 et auxiliaires 16, 18, l'étaleur-nappeur comprend des pignons moteurs 85, 89 entraînés en rotation par des moyens non représentés et engrénant respectivement sur des courroies crantées 84, 88 représentées symboliquement en tirets aux figures 2 à 4.To drive the main carriages 10, 14 and auxiliary carriages 16, 18, the spreader-lapper comprises driving pinions 85, 89 driven in rotation by means not shown and meshing respectively on belts notches 84, 88 symbolically represented in dashes in Figures 2 to 4.

Deux courroies crantées 84 s'étendent de part et d'autre des rouleaux et des tapis entre le chariot d'entrée 10 et le chariot auxiliaire 16, en passant du côté arrière 9 de l'étaleur-nappeur. Entre les chariots 10 et 16 auxquels elles sont fixées par leurs extrémités les courroies crantées 84 contournent chacune deux pignons de renvoi 85, 86 (dont le pignon moteur 85) pivotant respectivement autour d'un axe fixe parallèle aux axes des rouleaux 32 à 43, 60 à 69. Les pignons 85, 86 sont disposés de façon que les tronçons d'extrémité des courroies crantées 84 soient parallèles à la direction de translation des chariots 10, 16 auxquels ils sont respectivement fixés.Two toothed belts 84 extend on either side of the rollers and belts between the input carriage 10 and the auxiliary carriage 16, passing from the rear side 9 of the spreader-lapper. Between the carriages 10 and 16 to which they are fixed by their ends, the toothed belts 84 each bypass two return pinions 85, 86 (including the motor pinion 85) pivoting respectively around a fixed axis parallel to the axes of the rollers 32 to 43, 60 to 69. The pinions 85, 86 are arranged so that the end sections of the toothed belts 84 are parallel to the direction of translation of the carriages 10, 16 to which they are respectively fixed.

De même, deux courroies crantées 88 s'étendent de part et d'autre des rouleaux et des tapis entre le chariot de sortie 14 et le chariot auxiliaire 18, en passant du côté avant 7 de l'étaleur-nappeur. Entre les chariots 14 et 18 auxquels elles sont fixées par leurs extrémités, les courroies crantées 88 contournent chacune deux pignons de renvoi 89, 90 (dont le pignon moteur 89) pivotant respectivement autour d'un axe fixe parallèle aux axes des rouleaux 32 à 43, 60 à 69. Les pignons 89, 90 sont disposés de façon que les tronçons d'extrémité des courroies crantées 88 soient parallèles à la direction de translation des chariots 14, 18 auxquels ils sont respectivement fixés.Likewise, two toothed belts 88 extend on either side of the rollers and belts between the output carriage 14 and the auxiliary carriage 18, passing on the front side 7 of the spreader-lapper. Between the carriages 14 and 18 to which they are fixed by their ends, the toothed belts 88 each bypass two return pinions 89, 90 (including the motor pinion 89) pivoting respectively around a fixed axis parallel to the axes of the rollers 32 to 43 , 60 to 69. The pinions 89, 90 are arranged so that the end sections of the toothed belts 88 are parallel to the direction of translation of the carriages 14, 18 to which they are respectively fixed.

Par ailleurs, les chariots principaux 10, 14 et auxiliaires 16, 18 sont accouplés par paires 10, 16 et 14, 18 au moyen de câbles 92, 96 représentés symboliquement en traits mixtes aux figures 2 à 4. Ces câbles 92, 96 sont moins extensibles que les tapis 2, 5.Furthermore, the main carriages 10, 14 and auxiliary carriages 16, 18 are coupled in pairs 10, 16 and 14, 18 by means of cables 92, 96 shown symbolically in phantom in Figures 2 to 4. These cables 92, 96 are less extendable as rugs 2, 5.

Deux câbles 92 s'étendent de part et d'autre des rouleaux et des tapis entre le chariot d'entrée 10 et son chariot auxiliaire associé 16, en passant du côté avant 7 de l'étaleur-nappeur. Entre les chariots 10 et 16 auxquels ils sont fixés par leurs extrémités, les câbles 92 contournent chacun deux poulies de renvoi 93, 94 pivotant respectivement autour d'un axe fixe parallèle aux axes des rouleaux 32 à 43, 60 à 69. Les poulies 93, 94 sont disposées de façon que les tronçons d'extrémité des câbles 92 soient parallèles à la direction de translation des chariots 10, 16 auxquels ils sont respectivement fixés.Two cables 92 extend on either side of the rollers and belts between the input carriage 10 and its associated auxiliary carriage 16, passing on the front side 7 of the spreader-lapper. Between the carriages 10 and 16 to which they are fixed by their ends, the cables 92 each bypass two return pulleys 93, 94 pivoting respectively around a fixed axis parallel to the axes of the rollers 32 to 43, 60 to 69. The pulleys 93 , 94 are arranged so that the end sections of the cables 92 are parallel to the direction of translation of the carriages 10, 16 to which they are respectively fixed.

Deux câbles 96 s'étendent de part et d'autre des rouleaux et des tapis entre le chariot de sortie 14 et son chariot auxiliaire associé 18, en passant du côté arrière 9 de l'étaleur-nappeur. Entre les chariots 14 et 18 auxquels ils sont fixés par leurs extrémités, les câbles 96 contournent chacun deux poulies de renvoi 97, 98 pivotant respectivement autour d'un axe fixe parallèle aux axes des rouleaux 32 à 43, 60 à 69. Les poulies 97, 98 sont disposées de façon que les tronçons d'extrémité des câbles 96 soient parallèles à la direction de translation des chariots 14, 18 auxquels ils sont respectivement fixés.Two cables 96 extend on either side of the rollers and belts between the output carriage 14 and its associated auxiliary carriage 18, passing from the rear side 9 of the spreader-lapper. Between the carriages 14 and 18 to which they are fixed by their ends, the cables 96 each bypass two return pulleys 97, 98 pivoting respectively around a fixed axis parallel to the axes of the rollers 32 to 43, 60 to 69. The pulleys 97 , 98 are arranged so that the end sections of the cables 96 are parallel to the direction of translation of the carriages 14, 18 to which they are respectively fixed.

En fonctionnement, on commande l'entraînement des tapis 2, 5 par l'intermédiaire des rouleaux moteurs 39, 65 et celui des chariots 10, 14, 16, 18 par l'intermédiaire des pignons moteurs 85, 89 engrénant sur les courroies crantées 84, 88. On anime ainsi les chariots 10, 14, 16, 18 de mouvements de translation synchrones en va-et-vient. Les lois cinématiques à appliquer aux chariots principaux 10, 14 peuvent par exemple être celles enseignées par le FR-B- 2 234 395.In operation, the drive of the belts 2, 5 is controlled by means of the driving rollers 39, 65 and that of the carriages 10, 14, 16, 18 by means of the driving pinions 85, 89 meshing on the toothed belts 84 , 88. It thus drives the carriages 10, 14, 16, 18 of synchronous translation movements back and forth. The kinematic laws to be applied to the main carriages 10, 14 can for example be those taught by FR-B- 2 234 395.

Les positions extrêmes des mouvements de va-et-vient sont représentées schématiquement aux figures 2 et 3 et une position intermédiaire à la figure 4.The extreme positions of the reciprocating movements are shown diagrammatically in FIGS. 2 and 3 and an intermediate position in FIG. 4.

Si on désigne par L la largeur de la nappe formée 6, le chariot de sortie 14 et son chariot auxiliaire associé 18 suivent des mouvements de va-et-vient d'amplitude L effectués avec des vitesses instantanées ayant les mêmes valeurs et des sens opposés, de sorte que la longueur du trajet fermé 50 à 59 relatif au tapis arrière 5 est maintenue constante. Le chariot d'entrée 10 et son chariot auxiliaire associé 16 suivent des mouvements de va-et-vient d'amplitude de l'ordre de L/2 effectués avec des vitesses instantanées ayant les mêmes valeurs et des sens opposés, de sorte que la longueur du trajet fermé 20 à 31 relatif au tapis avant 2 est maintenue constante.If the width of the formed ply 6 is designated by L, the outlet carriage 14 and its associated auxiliary carriage 18 follow back-and-forth movements of amplitude L carried out with speeds instantaneous having the same values and opposite directions, so that the length of the closed path 50 to 59 relative to the rear belt 5 is kept constant. The input carriage 10 and its associated auxiliary carriage 16 follow back-and-forth movements of amplitude of the order of L / 2 carried out with instantaneous speeds having the same values and opposite directions, so that the length of the closed path 20 to 31 relative to the front belt 2 is kept constant.

Ces relations cinématiques entre chariots associés sont obtenues grâce aux câbles 92, 96 qui les accouplent. Dans une première phase du mouvement de va-et-vient allant de la position illustrée à la figure 2 à celle illustrée à la figure 3, les pignons moteurs 85, 89 sont entraînés dans le sens indiqué par les flèches G à la figure 2. Les courroies crantées 84 tirent alors le chariot d'entrée 10 vers le côté arrière 9 et les courroies crantées 88 tirent le chariot auxiliaire 18 vers le côté avant 7. Un effort de traction vers le côté avant 7 est transmis au chariot auxiliaire 16 par l'intermédiaire du câble 92 qui l'accouple au chariot d'entrée 10. Un effort de traction vers le côté arrière 9 est transmis au chariot de sortie 14 par l'intermédiaire du câble 96 qui l'accouple au chariot auxiliaire 18.These kinematic relationships between associated carriages are obtained by cables 92, 96 which couple them. In a first phase of the reciprocating movement going from the position illustrated in FIG. 2 to that illustrated in FIG. 3, the driving pinions 85, 89 are driven in the direction indicated by the arrows G in FIG. 2. The toothed belts 84 then pull the input carriage 10 towards the rear side 9 and the toothed belts 88 pull the auxiliary carriage 18 towards the front side 7. A traction force towards the front side 7 is transmitted to the auxiliary carriage 16 by l through the cable 92 which couples it to the input carriage 10. A tensile force towards the rear side 9 is transmitted to the outlet carriage 14 via the cable 96 which couples it to the auxiliary carriage 18.

Symétriquement, dans la deuxième phase du mouvement de va-et-vient allant de la position illustrée à la figure 3 à celle illustrée à la figure 2, les pignons moteurs 85, 89 sont entraînés dans le sens indiqué par les flèches H à la figure 3. Les courroies crantées 84 tirent alors le chariot auxiliaire 16 vers le côté arrière 9 et les courroies crantées 88 tirent le chariot de sortie 14 vers le côté avant 7. Un effort de traction vers le côté avant 7 est transmis au chariot d'entrée 10 par l'intermédiaire du câble 92 qui l'accouple au chariot auxiliaire 16. Un effort de traction vers le côté arrière 9 est transmis au chariot auxiliaire 18 par l'intermédiaire du câble 96 qui l'accouple au chariot de sortie 14.Symmetrically, in the second phase of the reciprocating movement going from the position illustrated in FIG. 3 to that illustrated in FIG. 2, the driving pinions 85, 89 are driven in the direction indicated by the arrows H in the figure. 3. The toothed belts 84 then pull the auxiliary carriage 16 towards the rear side 9 and the toothed belts 88 pull the output carriage 14 towards the front side 7. A traction force towards the front side 7 is transmitted to the entry carriage 10 via the cable 92 which couples it to the auxiliary carriage 16. A tensile force towards the rear side 9 is transmitted to the auxiliary carriage 18 by via the cable 96 which couples it to the outlet carriage 14.

Les efforts de traction mentionnés, utiles pour synchroniser les mouvements des chariots associés, sont avantageusement absorbés par les câbles 92, 96 car ceux-ci sont moins extensibles que les tapis 2, 5. Ceci procure un avantage important par rapport aux étaleurs-nappeurs de la technique antérieure, dans lesquels ces efforts de traction sont essentiellement absorbés par les tapis. En conséquence, les tapis sont moins sollicités et peuvent être de constitution plus légère tout en ayant une durabilité améliorée. La constitution légère des tapis est très avantageuse car elle réduit l'inertie de la machine et facilite le mouvement dans les régions courbes de leurs trajets fermés, ce qui améliore la régularité du transport du voile 4 dans ces régions.The traction forces mentioned, useful for synchronizing the movements of the associated carriages, are advantageously absorbed by the cables 92, 96 because they are less extensible than the belts 2, 5. This provides an important advantage compared to the spreader-lappers of the prior art, in which these tensile forces are mainly absorbed by the belts. As a result, carpets are less stressed and can be lighter in constitution while having improved durability. The light construction of the belts is very advantageous because it reduces the inertia of the machine and facilitates movement in the curved regions of their closed paths, which improves the regularity of the transport of the web 4 in these regions.

Le voile 4 issu de la carde est déposé sur le tronçon incliné 20 suivi par le tapis avant 2 (voir figure 4). Après déviation sur le rouleau 33, il est transporté horizontalement sur le tronçon 21 jusqu'au chariot d'entrée 10. Sur celui-ci, le voile 4 est d'abord dévié par le rouleau 34 selon l'angle A compris entre 0 et 90 degrés. La valeur modérée de l'angle A évite que le voile puisse être perturbé lorsqu'il est dévié par le rouleau 34. Après avoir été transporté sur le tronçon incliné 22 du tapis avant 2, le voile 4 contourne le rouleau de pincement 35. La ligne de pincement définie entre les rouleaux 35, 61 empêche le voile 4 de décoller du tapis avant sous l'action de la force centrifuge. Comme le voile 4 décrit autour du rouleau de pincement 35 un virage selon un angle B = 180° - A

Figure imgb0001
compris entre 90 et 180 degrés et comme la ligne de pincement se trouve en position angulaire intermédiaire le long de ce virage, le pincement entre les rouleaux 35, 61 ne provoque pas de perturbations dans le tronçon 22 incliné précédant ce pincement.The veil 4 from the card is placed on the inclined section 20 followed by the front belt 2 (see Figure 4). After deflection on the roller 33, it is transported horizontally on the section 21 to the input carriage 10. On this, the web 4 is first deflected by the roller 34 at the angle A between 0 and 90 degrees. The moderate value of the angle A prevents the veil from being disturbed when it is deflected by the roller 34. After being transported on the inclined section 22 of the front belt 2, the veil 4 bypasses the pinch roller 35. The pinch line defined between the rollers 35, 61 prevents the web 4 from peeling off the front belt under the action of centrifugal force. As the web 4 describes around the nip roller 35 a turn at an angle B = 180 ° - A
Figure imgb0001
 between 90 and 180 degrees and as the nip is in an intermediate angular position along this turn, the nip between the rollers 35, 61 does not cause disturbances in the inclined section 22 preceding this nip.

Si l'angle B était trop important (180 degrés ou plus), on pourrait observer, pour des cadences élevées, des décollements indésirables du voile immédiatement en amont du rouleau de pincement 35 dûs à la déviation angulaire trop importante ou à un certain affaissement du tapis avant 2 en amont du rouleau de pincement 35. Si l'angle B était trop faible (90 degrés ou moins), le voile 4 ne serait pas transporté de façon fiable sur le tronçon trop incliné 22 précédant le rouleau de pincement 35. Le pincement préalable du voile 4 entre les rouleaux 35, 61 et la valeur appropriée de l'angle B assurent ainsi la meilleure stabilité du transport du voile, d'où il résulte une nappe 6 de qualité optimale.If the angle B was too large (180 degrees or more), one could observe, for high rates, undesirable detachments of the web immediately upstream of the pinch roller 35 due to the excessive angular deflection or to a certain sagging of the front belt 2 upstream of the pinch roller 35. If the angle B was too small (90 degrees or less), the web 4 would not be transported reliably on the excessively inclined section 22 preceding the pinch roller 35. The prior clamping of the web 4 between the rollers 35, 61 and the appropriate value of the angle B thus ensure the best stability of the transport of the web, from which results a sheet 6 of optimal quality.

Dans l'exemple de réalisation décrit, le rouleau 34 déviant le voile 4 selon l'angle A avant la ligne de pincement est monté sur le chariot d'entrée 10. On comprendra que le rouleau 34 pourrait avoir son axe fixe par rapport au châssis 1 de l'étaleur-nappeur. Dans ce cas, les angles A et B sont variables, mais le chariot d'entrée est plus léger et le rouleau 34 contribue à soutenir le tapis 2 en amont du chariot d'entrée.In the embodiment described, the roller 34 deflecting the veil 4 at the angle A before the nip is mounted on the input carriage 10. It will be understood that the roller 34 could have its axis fixed relative to the chassis 1 of the spreader-lapper. In this case, the angles A and B are variable, but the input carriage is lighter and the roller 34 contributes to supporting the belt 2 upstream of the input carriage.

Après avoir parcouru la zone de pincement 23, 53 le voile 4 parvient au chariot de sortie 14 qui le dépose par plis alternés sur le tablier 8 pour former la nappe 6.After having traversed the nip 23, 53 the veil 4 reaches the outlet carriage 14 which deposits it by alternating folds on the deck 8 to form the ply 6.

La nappe formée 6 est, dans une certaine mesure, abritée des courants d'air créés par les mouvements de va-et-vient des chariots 10, 14, 16, 18 du fait de la présence des tronçons de tapis 26, 54 situés immédiatement au-dessus du tablier 8. La présence des tronçons verticaux 27, 55 adjacents à ces tronçons 26, 54 contribue en outre à éviter que des courants d'air latéraux parviennent au niveau de la nappe formée 6. Comme les chariots auxiliaires 16, 18 se déplacent dans le passage inférieur 70 de l'étaleur-nappeur séparé du tablier 8 par la cloison 72, les courants d'air provoqués par leurs mouvements restent essentiellement confinés à l'intérieur du passage inférieur 70, à distance des zones où passent le voile 4 et la nappe 6. Par conséquent ni le voile 4 ni la nappe 6 ne sont perturbés par ces courants d'air et l'homogénéité de la nappe formée 6 est améliorée, notamment lorsque l'étaleur-nappeur fonctionne à grande vitesse.The formed sheet 6 is, to a certain extent, sheltered from the air currents created by the reciprocating movements of the carriages 10, 14, 16, 18 due to the presence of the sections of carpet 26, 54 located immediately above the deck 8. The presence of the vertical sections 27, 55 adjacent to these sections 26, 54 also contributes to preventing lateral air currents from reaching the level of the sheet formed 6. Like the auxiliary carriages 16, 18 move in the lower passage 70 of the spreader-lapper separated from the apron 8 by the partition 72, the air currents caused by their movements remain essentially confined inside the passage lower 70, at a distance from the zones through which the veil 4 and the ply 6 pass. Consequently neither the veil 4 nor the ply 6 are disturbed by these air currents and the homogeneity of the formed ply 6 is improved, in particular when the spreader-lapper operates at high speed.

Bien que, dans le cadre général de l'invention, les chariots auxiliaires puissent être situés dans des passages inférieurs distincts, il est avantageux, pour réduire l'encombrement, de prévoir un passage inférieur unique 70 dans lequel se déplacent les deux chariots auxiliaires 16, 18. Comme les chariots auxiliaires 16, 18 sont posés sur des rails 76, 80 situées à des hauteurs différentes dans le passage inférieur 70, les courroies de transmission 84, 88 et les câbles d'accouplement 92, 96 sont également disposés à des hauteurs différentes, et ils n'interfèrent pas en fonctionnement.Although, within the general framework of the invention, the auxiliary carriages can be located in separate lower passages, it is advantageous, to reduce the space requirement, to provide a single lower passage 70 in which the two auxiliary carriages 16 move. , 18. As the auxiliary carriages 16, 18 are placed on rails 76, 80 located at different heights in the lower passage 70, the transmission belts 84, 88 and the coupling cables 92, 96 are also arranged at different heights, and they do not interfere in operation.

Le passage inférieur 70 a une longueur au moins égale à 3L/2, c'est-à-dire à la somme des amplitudes des mouvements de va-et-vient des chariots principaux 10, 14 (ou des chariots auxiliaires 16, 18).The lower passage 70 has a length at least equal to 3L / 2, that is to say the sum of the amplitudes of the reciprocating movements of the main carriages 10, 14 (or the auxiliary carriages 16, 18) .

Claims (6)

  1. A spreading and lap-forming machine for folding a web (4) and converting it into a lap (6), the machine comprising at least two belts (2, 5) each following a closed path (20 to 31, 50 to 59) and associated with rollers (32 to 43, 60 to 69) for guiding and driving each respective belt, the closed paths (20 to 31, 50 to 59) being outside one another and adjacent one another in a pinch zone (23, 53) bounded by guide rollers borne by two main carriages (10, 14) movable in translation in a horizontal direction at right angles to the axes of the rollers (32 to 43, 60 to 69), compensating means comprising at least one auxiliary carriage (16, 18) movable in translation at right angles to the axes of the rollers (32 to 43, 60 to 69) for keeping the length of each closed path (20 to 31, 50 to 59) substantially constant, each closed path (20 to 31, 50 to 59) having a 180° turn around at least one guide roller (41, 67) borne by an auxiliary carriage (16, 18), means (20, 21, 22) for bringing the web (4) to the inlet of the pinch zone (23, 53), a table (8) movable in a direction parallel to the axes of the rollers (32 to 43, 60 to 69) and receiving the web (4) on leaving the pinch zone (23, 53), and drive means (84, 85, 88, 89) for moving the main carriages (10, 14) and the compensating means (16, 18) in translatory reciprocation, characterised in that each auxiliary carriage (16, 18) is situated in a bottom passage (70) extending under the table (8) and separated therefrom by means such as a partition (72) to prevent air currents generated inter alia by the auxiliary carriages from spreading towards the web and/or the lap in process of formation.
  2. A machine according to claim 1, characterised in that the compensating means comprise a number of auxiliary carriages (16, 18) each associated with a respective closed path (20 to 31, 50 to 59) and situated in the same bottom passage (70).
  3. A machine according to claim 2, characterised in that the auxiliary carriages (16, 18) are mounted for sliding on respective side rails (76, 80) or the like extending inside the bottom passage (70) from one side to the other of the rollers (41, 67) borne by the auxiliary carriages (16, 18), the rails (76, 80) being at different heights.
  4. A machine according to claim 2 or 3, characterised in that the bottom passage (70) has a length at least equal to the sum (3L/2) of the amplitudes of reciprocating motion of the two main carriages (10, 14), L denoting the width of the lap (6) formed.
  5. A machine according to any of claims 1 to 4, characterised in that each main carriage (10, 14) is connected to an auxiliary carriage (16, 18) by coupling means (92, 96) which are less stretchable than the belts (2, 5) and are disposed so as to be tensioned by the drive means (84, 85, 88, 89).
  6. A machine according to any of claims 1 to 5, characterised in that the drive means comprise at least one transmission means (84, 88) which engages a drive pinion (85, 89), one end of the transmission means (84, 88) being secured to a main carriage (10, 14) and the other end being secured to an auxiliary carriage (16, 18), the main carriage (10, 14) and the auxiliary carriage (16, 18) being also interconnected by coupling means (92, 96), and when the drive pinion (85, 89) rotates in one direction it pulls the main carriage (10, 14) in a first phase of reciprocating motion whereas when the drive pinion (85, 89) rotates in the other direction it pulls the auxiliary carriage (16, 18) in a second phase of reciprocating motion.
EP92401461A 1991-06-03 1992-05-27 Cross-lapper Expired - Lifetime EP0517568B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9106633A FR2677044B1 (en) 1991-06-03 1991-06-03 SPREADER-STEAMER.
FR9106633 1991-06-03

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EP0517568A1 EP0517568A1 (en) 1992-12-09
EP0517568B1 true EP0517568B1 (en) 1995-10-11

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US (1) US5285554A (en)
EP (1) EP0517568B1 (en)
JP (1) JP3263073B2 (en)
AT (1) ATE129029T1 (en)
DE (2) DE69205336T2 (en)
ES (1) ES2089441T3 (en)
FR (1) FR2677044B1 (en)
WO (1) WO1992021802A1 (en)

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EP1959038B1 (en) 2007-02-15 2010-04-14 Oskar Dilo Maschinenfabrik KG Device for laying a fleece
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EP1816243A1 (en) 2006-02-01 2007-08-08 Oskar Dilo Maschinenfabrik KG Device for laying a nonwoven
US7810218B2 (en) 2006-02-01 2010-10-12 Oskar Dilo Maschinenfabrik Kg Cross lapper

Also Published As

Publication number Publication date
DE69205336T2 (en) 1996-05-23
JPH06502699A (en) 1994-03-24
FR2677044B1 (en) 1994-04-29
US5285554A (en) 1994-02-15
EP0517568A1 (en) 1992-12-09
ES2089441T3 (en) 1996-10-01
ATE129029T1 (en) 1995-10-15
FR2677044A1 (en) 1992-12-04
WO1992021802A1 (en) 1992-12-10
JP3263073B2 (en) 2002-03-04
DE517568T1 (en) 1993-04-29
DE69205336D1 (en) 1995-11-16

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