FR2581086A1 - DEVICE FOR SPREADING A CONTINUOUS FILAMENT CABLE - Google Patents

Abstract

THE INVENTION RELATES TO A DEVICE FOR SPREADING CONTINUOUS FILAMENT CABLES. IT INCLUDES AT LEAST ONE SPREADING UNIT COMBINING IN A COMBINATION: A DRUM 11 DRIVED IN ROTATION, EXTENSIBLE EXTENDABLE ELEMENTS 6 ARRANGED AT THE PERIPHERY OF THE DRUM ACCORDING TO THE GENERATORS AND EQUIPPED WITH PINS 25 TURNS OUTWARDS 16, 17 , 18 39 AND 40 TO SUBMIT THE EXTENSIBLE EXTENSIBLE ELEMENTS TO SEVERAL SUCCESSIVE ALTERNATE PHASES OF EXTENSION AND RETRACTION DURING A DRUM TURN, FROM THE CABLE FEEDERS TO THE EXTENSIBLE EXTENSION ELEMENTS AND MEANS 20 TO 23 FOR SUBMITTING THE CABLE THE ACTION OF THE PICOTS DURING THE EXTENSION PHASES AND TO REMOVE THEIR ACTION DURING THE RETRACTION PHASES. APPLIES TO THE SPREADING OF CONTINUOUS FILAMENT CABLES WITH A VIEW TO OBTAINING TABLECLOTHS FOR USE IN THE MANUFACTURE OF NON-WOVEN ARTICLES.

Description

The present invention relates to a device for spreading

  continuous filament cable in order to obtain a tablecloth

  useful in particular in the manufacture of nonwoven articles.

  There are many ways to achieve spreading or widening - the two terms having the same meaning in this text - of a continuous filament tow in the

purpose of getting a tablecloth.

  French Patent 1,418,403 describes the use of curved bars and air expanders. In French Patent 1,498,481 there is described an apron-carrier, elastically extensible material which widens transversely as it progresses. The surface of the carpet may be provided with small closely spaced points causing a temporary connection of said surface with the filament network and causing a

  more uniform distribution of the filaments. According to the American patent

  cain 3 808 639, a sheet of filaments is spread by passing it over a series of discs located close to each other

  which revolve around the same axis but in different directions

  gentes; the periphery of the discs being provided with flexible protuberances for engaging the filaments. In the Japanese application 72/04 738 is described an apron-carrier which widens transversely as it progresses and which is constituted by coil springs arranged transversely to the direction of advance, spreading the cable or ribbon due to sliding on the turns of the springs while

  these lengthen when advancing the apron.

  However, the above devices do not satisfy

  especially if you want high spreading rates -2- (7 to 8 times the initial width). Among the disadvantages they present, we can cite: limited performance, low expansion rate for curved bars, 5. noise nuisance, high fluid consumption for air expander according to French Patent 1,418,403, limited enlargement otherwise shelf life

  reduced elasticity of the device according to the French patent

  1 498 481, 10. lack of homogeneity of the water table due to the fact that

  is not sufficiently fixed during spreading, the rate of

  limited for the device according to the US patent

3,808,639,

  irregularity of the layer resulting from

  packages, spring life problems, expansion rates

  limited for the device according to Japanese demand

72/04 378.

  To avoid the disadvantages of the above devices, the

  applicant claimed in a patent application a provision

  continuous filament spreading system characterized by

  the fact that it comprises at least one spreading unit comprising

  at least: - a roller mounted on an axis driven in rotation, - elongated extensible elements, integral in rotation with the

  roll, arranged on the periphery of the latter according to a

  parallel to the generatrices, each element being provided with at least one row of outwardly facing pins; means for subjecting the elongated elements to an extension phase and to a retraction phase during a rotation of roll, means for feeding the cable in contact with the elongated elements at the beginning of the extension phase and the recovery means

  cable at the end of the extension phase.

  3- In operation, the pins penetrate the cable at the beginning of the extension phase and deviate during it by dragging and thus spreading the filaments. At the end of the extension phase, the spread cable is taken by means of recovery and thus subtracted from the action of the pins; the elongated elements alone (without the cable) undergo the retraction phase at the

  end of which they found their original length.

  Advantageously, the spreading device comprises several sets (for example 10 to 12) as above arranged one after the other in a horizontal plane; the overall spread rate being the product of the spreading rates of all

all together.

  The above device is satisfactory in that it eliminates the disadvantages of prior devices and allows in particular to obtain a perfectly homogeneous sheet

  and regular. However, because of the long-term

  In the case of spreading units, it has a large footprint, which is not always compatible with the available space. Furthermore, the multiplication of spreading assemblies and in particular cams which are expensive

cost price problems.

  The present invention relates to a device for spreading

  or extension of a continuous filament cable to solve these problems. It relates to a device for spreading a continuous filament cable characterized by

  the fact that it comprises at least one spreading unit comprising

  at least in combination: - a drum driven in rotation, - extensible elongate elements, integral in rotation of the drum, arranged at the periphery of the latter, according generatrices, each element being provided with at least one row of spikes turned outwardly, means for subjecting the elongate members to a plurality of successive alternating phases of extension and retraction during a revolution of the drum; means for feeding the cable to the extensible elongate members; spread cable, means for subjecting the cable to the action of the pins during the extension phases and means for subtracting it from

  their action during the retraction phases.

  The periphery of the drum defines a path for the cable

  during which it is subjected to spreading in a zone of slack

  which extends over all or part of the periphery of the drum and comprises several stages of spreading. The entry of the spread zone is defined by the fixed position of at least a portion of the cable feeding means. Similarly, the output of the spreading zone is defined by the fixed position of at least a portion of the recovery means of the spread cable. The drum may advantageously be constituted by two end flanges wedged on an axis; the two flanges possibly being connected at their periphery by a solid cylindrical skirt or perforated, or

simply by spacers.

  The extensible elongated elements are angularly distributed regularly around the axis of the drum. They are each constituted by at least one strap or elastic band of which

  the section may be square or rectangular more or less flat.

  The outer face of the strip, which may be either the flat of the strip or the edge, is provided with at least one row of pins extending in a direction parallel to the generatrices of the roll. There may be several rows of pins, in this case, they are advantageously arranged in staggered rows. Each extensible elongated member may have multiple bands

  adjacent elastics, integral at both ends.

  Extensible elongate members are even in number and at least four. During the rotation of the roll, each element is subjected on a fraction of a turn to an extension phase then

  on the next fraction of the same length at a phase of

  traction; the extension-retraction cycle repeating itself on one revolution, a number of times equal to half the number of extensible elongated elements, two consecutive elements being in two phases

  different. Each extension phase located in the zone of

  This corresponds to a spreading stage.

  According to a preferred embodiment, the means for subjecting the stretched elongated elements to several

  successive alternating phases of extension and contraction

are:

  - a series of crank-rod systems mounted at both ends

  of the drum, each associated and connected to the end of at least one elongated extensible element, - a fixed ring gear, coaxial with the axis carrying the drum, disposed at each of the two ends of said drum, - satellites mounted on the drum, associated with each system

  crank-rod, and engaged with the toothed crown correspon-

  to rotate the crank.

  The crank of each crank-crank system is coaxial and integral in rotation with the corresponding satellite, while the crankpin is connected directly or indirectly to the end of an elongated extensible element or of two consecutive elements in such a way that an allround turn of the connecting rod corresponds to an extension-retraction cycle. In the case where the same connecting rod-crank system is connected to two consecutive elongated elements, the connection is designed in such a way that when

  elements are in extension, the other is in retraction.

  For a turn of the crank, that is to say a round trip of the small end or an extension-retraction cycle, there is a -6- turn of the corresponding satellite. If N is the number of extension-retraction cycles per roll revolution (the number of expandable elongate elements being 2 N), if D is the number of teeth of the ring gear, the number of teeth of each satellite will be

D / N.

  However, the means for subjecting the extensible elongated elements to several successive alternating phases of extension

  and retraction can take other embodiments.

  For example, an embodiment consisting of:

  a rotating cylindrical cam provided with a circumferential groove

  left side, mounted on the drum, associated with each of the two ends of each extensible elongated element, - a roller movable in the groove of each cam and a connecting bar between said roller and the corresponding end of the extensible elongated element, and as before, a fixed ring gear coaxial with the axis carrying the drum, disposed at each of the two ends of said drum and the satellites, which associated with each cam

  rotate them from the corresponding ring gear

dante.

  In this embodiment, advantageously, the circumferential groove

  each cam has two helix sections of opposite pitch, each extending over 180 and corresponding to an extension phase, the other to a retraction phase; a cam revolution corresponding to a complete cycle. As for the mode of

  previous realization, if N is the number of extension-cycles

  retraction per roll revolution, D the number of teeth of the ring gear, the number of teeth of each satellite will be D.

  The means for feeding the cable to the extensively elongate elements

  bles may comprise a fixed curved bar disposed in the immediate vicinity of the drum and determining the entry of the spreading zone.

258,1086

  The means for taking up the spread cable may comprise a duet presser of call rollers of which at least one is driven positively, the relative position of this duet with respect to

  drum defining the output of the spreading zone.

  The means for subjecting the cable to the action of the pins during the extension phases and to subtract them from their action during the retraction phases comprise, according to a preferred embodiment: a mobile member for lifting the adjacent and parallel cable to each extensible elongated element, - a lever associated with each of the two ends of each cable lifting member, articulated on the drum, - a fixed levers control cam above, arranged to

  each of the two ends of the drum and coaxial with the latter.

  The movable member for lifting the cable is movable in a radial direction. It is for example constituted by an elongated wafer extending along the extensible elongated element or a profile, for example U-section partially surrounding the extensible elongated element. The control cam of the levers associated with each cable lifting member has in the zone of its periphery a cam path consisting of zones

  repetitive, each corresponding to an extension-

  retraction. Each lifting member is controlled by the two levers at its ends, which are connected to the cam path and follow its profile. Said profile in each zone is drawn such that during the rotation of the drum the movements of the lifting member occur at the beginning of

  each phase. At the beginning of the retraction phase, there is

  outward movement of the lifting member, which puts the cable out of the action of the pins during the entire retraction phase. At the beginning of the extension phase, there is movement inwards of the lifting member, thus subjecting the

  cable to the action of the pins during the whole extension phase.

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  Advantageously, each elongated extensible element is associated with deformation assistance means (extension and

  retraction) accompanying said element in its deformation.

  In the extension phase, their role is to reduce the stretching stresses of the elongated element and in the retraction phase, they allow it to be uniformly effected.

  along the length of said elongate member.

  These means are two slides with which each

  extensible elongated element is in direct or indirect contact with

  at least a portion of its length - substantially half in the retracted state - and at least a portion of the periphery of its section outside the area provided with pins. The sliders are integral in translation of one and the other of the means subjecting the extensible elongated elements to the extension-retraction cycles and move in opposite directions accompanying each element in its extension and retraction movement. In the extension phase, the two slides move outwards and, because of their contact with the elongated element, act on the latter by reducing the stretching constraints to which it is subjected. In the retraction phase, the two slides are pushed inwards under the effect of the means submitting the elongated elements to the

  extension-retraction cycles (connecting rods of

  crank or link bars). Since we keep

  maintains contact between the elongated extensible elements and the slides, the thrust of the latter help the former to

  retract uniformly over their entire length.

  The device according to the invention may comprise several spreading assemblies as described above arranged one after the other. For example, it may comprise three sets, the axes of the three drums being arranged according to the

  vertices of an equilateral triangle.

  In operation, for each cycle, during the extension phase, the pins that have penetrated into the cable, deviate thereby leading to spreading the filaments; during the retraction phase the pins become narrower, but as they were removed from the cable, it retains the width that it had at the end

  extension phase, this until the next cycle.

  But the invention will be better understood with the aid of the exemplary embodiments and the schematic figures below, given in FIG.

illustrative and non-limiting title.

  FIGS. 1 and 2 show a device according to the invention with three sets of spread respectively seen at the end and seen from

face.

  - Figure 3 is a longitudinal sectional view of a spreading assembly.

  FIG. 4 is a partial end view of a set of

  showing, in particular, the lifting organs of the

cable.

  FIG. 5 is a partial view of an embodiment

an elongated extensible element.

  FIG. 6 represents in longitudinal section an element

  Extensible elongated mounted on the drum.

  FIG. 7 represents in cross-section an elongated element

extensible mounted on the drum.

  FIG. 8 is a cross-sectional view of the means of

  mounting on the drum of an elongated extensible element.

  FIGS. 9 and 10 show elongated elements

  and the associated means for subjecting them to extension and retraction phases, the latter being carried out under

two different forms.

  The device according to FIGS. 1 and 2 comprising three sets of spreading comprises three rotary drums 2, 3, 4 whose axes are arranged according to the vertices of a triangle

  equilateral, on a frame 5; cable 1 passing through the drums

bursary in the order 2, 3, 4.

  The drum 2 comprises 14 elongated extensible elements 6 schematized by lines, defining 7 stages of spreading

- 10 -

  theoretical; the drum 3 has 10 elongated elements exten-

  sibles defining 5 theoretical spreading stages, and the drum 4 has 6 elongated extensible elements defining

  3 stages of theoretical spreading. In fact, given the

  relative position of the drums and the resultant cable path, the number of active stages is 5, 3, 2

  the drums 2, 3, 4, which makes a total of 10 stages of spreading.

  A bent bar 7 forming part of the cable feeding means is disposed near the first drum 2. It serves to define the entry of the spreading zone and also constitutes an entry brake limiting the backward rise the effect of spreading. Close to the roll 4 is a duet 8 of

  pressure rollers 81-82 of which at least one is positively driven

  tively. This duo constitutes the means of recovery of the spread sheet and determines the exit of the spreading zone of the drum 4. The relative position of the drums 2 and 3 determines the output of the spreading zone of the drum 2 and the inlet of the drum. the spread zone of the drum 3. Similarly, the output of the spreading zone of the drum 3 and the entrance of the spreading zone of the drum 4 are determined by the relative positions of the drums 3 and 4. The drums 2, 3, 4 are equipped with anti-winding anti-winding shutters 9. An accidental winding of the cable over the entire periphery of a drum causes the shutter to tilt,

  which then triggers an alarm and stops the machine.

  In FIG. 2, it will be noted that the drums 2, 3, 4 are of increasing length, according to the increasing width of the cable being spread and that they are driven by a set

common motor-dimmer 10.

  In Figure 3, there is shown schematically, in longitudinal section, a spreading assembly. A drum is noted for example the drum 3 comprising two end flanges 11, provided with longitudinal extensions 110, secured by keying an axis 12 rotatably mounted on the frame 5. The drive is effected via a pulley or toothed wheel 14 and,

- 11 -

  of a belt or chain 15, from the motor-variator 10. The

  two flanges 11 are connected by spacers not shown

  Tees. We can also see in this figure 3 an elongated element

  extensible 6, provided with pins 25, mounted on the periphery of the drum.

  bour 3 and whose ends are each secured to extension means 13 (subjecting the elongate elements to successive phases of extension-retraction) based on the principle of the crank-handle system according to the embodiment shown in Figure 10. The crank 16 the connecting rod-crank system is integral and coaxial with a satellite 17 itself engaged with a fixed ring gear 18 coaxial with the axis 12. The ring gear 18 is integral and coaxial with a tubular member 19 fixedly mounted on the frame 5 and serving as a bearing on the axis 12. The drum 3 comprising 10 extensible elongated elements, each

  end of the drum 3 is provided with 10 means of exten-

  13 and 10 satellites 17. At each end of the drum 3, a fixed cam 20 is mounted integral and coaxial with the tubular member 19. It is provided with a cam 21 zone path

  repetitive each corresponding to a retraction cycle.

  The cam path 21 controls levers such as 22 serving the movement of members 23 for lifting the cable. In Figure 4,

  we note in particular the drum 3, its axis 12, the tubular member

  19, the cam 20 which is secured thereto, extendable elongate elements 6 disposed at the periphery of the drum 3 in their mounting means 24, the members 23 for lifting the cable and the levers 22 acting on the members 23. The path of 21 is a groove formed in the body of the cam 20 and comprises a succession of sectoral zones S, each comprising a portion A corresponding to an extension phase during which the cable is subjected to the action of the pins 25 and a part B corresponding to a retraction phase during which the cable is "cut", the levers 22 having pushed out the

- 12 -

  members 23 for lifting the cable. (See lever 22.b). The levers 22 are L-shaped. One of their ends is articulated about an axis 26 parallel to the axis 12 of the drum 3,

  while the other is secured to the cam path 21 by the

  medium of the lever being secured to one end of the corresponding member 23 of

lifting of the cable.

  As can be seen, the lifting member 23 of the cable is constituted by a U-section section surrounding the elongate extensible element 6 and its mounting means 24. It is therefore subjected to the action of the levers 22 to its outward radial movement and return to its original position, and is guided

  in this movement by unrepresented guide means.

  An embodiment of an elongate expandable member is shown in Figure 5 in partial view. I1 consists of a strap 28 of elastomeric material provided at each of its ends with a fastener 29 carrying a threaded rod 30 for attachment to the drum by appropriate means shown in Figures 6, 7, 8. Note that in this realization the pins 25 are arranged parallel to the flat of the strap and fixed by picking. The density of the pins is chosen according to parameters such as the title of the cable, title to the strand, width, rate

spreading, etc.

  In Figures 6 to 9, there is shown an elongate extensible member and mounting means on the drum. Figure 6 is a simplified longitudinal sectional view. FIG. 7 is a more detailed sectional view according to a --- of FIG.

  Figure 8 is also a detailed sectional view, according to b --- b.

  FIG. 9 schematically shows an elongated element

  expandable, its means of assembly as well as a form of

  means to submit it to repetitive cycles of ex-

  tension-retraction, these means being represented in three

- 13 -

positions (9-1, 9-2, 9-3).

  The mounting means of each extensible elongate member (Figs 6 to 9) comprise for each end of the element a

  profile 321 in a material such as stainless steel that can slide

  in a suitable guideway on the periphery of the drum. The profile 32 is provided with an end piece 33, made of polyamide, which is integral therewith. The end of the extensible elongate member 6 is fixed by screw-nut system on the end piece 33 by means of its threaded rod 30 passing through a hole 34 formed in said piece 33. This method of attachment allows adjustment of the tension of the strap 28 at rest. The guide path of the profile 32 is formed on the one hand by bearing rollers 35, on the other hand, by a slideway 36 arranged at the

  periphery of the flanges it or on their extensions 110 (fig.7-8).

  The profile 32 is mounted in the slideway 36 by means of friction parts 37 made of plastic material (FIG 7) and guided by the rollers 35 by means of

guide 38 (FIG 8).

  In Fig. 9 and partly in Fig. 8, there is shown means for subjecting an extensible elongate member to retraction cycles. They are constituted by a crank-handle system, namely the crank wheel 16 (already

  mentioned in the description of Figure 3), in solidarity with the

  satellite 17 itself engaged with the ring gear 18 and a

  connecting rod 39 connecting the crank 16 to the corresponding section 32.

  The fixing means of the connecting rod 39 to the profile 32 are visible

  Figure 8. There is a crank-rod system at each end

  of each extensible elongate member.

  In FIG. 9 in position 9-1, the elongated element is shown in maximum extension, in the 9-2 position in the retracted state, and in the 9-3 position in an intermediate state. Positions 9-1 and 9-2 are also representative of the relative positions of two

  successive elongated elements on the drum.

- 14 -

  Another embodiment of the means for subjecting elongated extensible members to extension-retraction cycles

is shown in Figure 10.

  Here, two consecutive extendible elongate members 61 and 62 are actuated at each end by a single system

  crank rod. The foot of the connecting rod 39, driven by

  Velle 16 is fixed on a toothed wheel 40 engaged at two opposite points of 180 with two racks 411, 412, integral respectively with the profiles 321 and 322 corresponding to the elongated elements 61 and 62. It can be seen that the two elongated elements deform well into opposite direction, when the element 61 is in maximum extension (in the case of the figure), the element 62 is at its

minimum length.

  In the embodiment described above, the slides

  The buckets assisting each extensible elongate element during the extension and retraction phases consist of the sections 32 themselves which extend to the middle portion of the extensible elongate members. Mu by the crank-crank system, each section operates a thrust on riders 42 with which it comes into contact, said riders being secured to the strap 28 and judiciously distributed along it. The thrust is each time in the direction of deformation of the strap, it causes a relaxation of stretching constraints of the strap extension, and promotes a uniform retraction of the strap over its entire length in

the retraction phase.

  In operation, with reference to FIG. 1, the cable having been put in place and the machine started, half of the extensible elongate elements 6 are in the retraction phase and in "tilting" phase, the other half in the retraction phase and in " dépico-

  On each drum (2, 3, 4), there is a succession of fixed sectors S, S ', etc., each corresponding to a cycle

- 15 -

  extension-retraction; the extension phase corresponding to a

  half-sector A, A '... etc and the half-turn phase at half

  sector B, B '... etc .. Either the first spreading stage S, on the drum 2, or an elongated extensible element 6 arriving in position a at the beginning of the sector A, it begins at this point its phase

  at the same time as the "picotage" is done. The exten-

  sion continues throughout the course of the arc ab, so the cable undergoes a first phase of spreading. At point b, there is at the same time "trimming" and beginning of the retraction phase. The elongated element 6 traverses the arc bc (sector B) by retracting and the cable which is no longer subject to the pins of this

  elongate element undergoes no change in its width.

  At the point, the elongated element 6 has completed its first extension-retraction cycle, and starts the second (sector S '). There is again "pecking" of the cable taken at its outlet width of the sector A, extending the elongated element on the path of the arc cd (sector A ') and second phase of spreading. Note that the "repoting" takes place at the same place on the cable as

  the "picotage" has. Then on the arc of (sector B ') there is re-

  traction with "dépicotage". The extension-retraction cycles thus continue on the five active stages of the drum 2, then the three active stages of the drum 3 and finally the two active stages of the drum 4. At the machine outlet, at the level of the duo 8, the

  cable was subjected to ten stages of spreading.

  At the exit of the device, the sheet may be collected by known means for subsequent handling or feed a lapper. The speed of operation of the device depends on the title of the cable, its presentation and the speed of recovery of the web. Of course, if the web directly directly feeds another transformation device, the output speed will be a function of the feed speed of the other device.

258-1086

- 16 -

  By way of example, the device, according to the present

  cription, was used for the spreading of a continuous filament polyethylene glycol terephthalate filament of global title ktex, 6.7 dtex strand. The machine has 10 spreading stages, the spreading rate for each stage being 1.25. The width of the cable at the entrance of the first floor is 22 cm, the width of the sheet at the exit of the machine is 207.5 cm. The operating speed was 70 m / min. The tablecloth obtained is perfectly regular. Indeed, the progressive taking charge of the layer from one floor to another ensures even spreading of the cable. On this point, the disadvantages of the known devices are avoided. In addition, the multiplication of the spreading stages makes it possible to obtain a high overall spreading ratio, greater than 10, while having a limited spreading rate on each floor, which guarantees a good resistance of the mechanical members, in particular particular

  elongated extensible elements with pins.

  Moreover, compared to the device invented by the

  deresse and quoted in the prior art of the present application, the present device allows a saving of material and therefore cost and offers a reduced footprint. Indeed, for the same number of spreading stages, the first device required forty extensible elongated elements while the present does not require

more than thirty.

  In the means of extension-retraction, the replacement

  cams by crank-crank systems, which the present device lends itself well, also allows a savings on costs. In addition, the triangle arrangement of the drums leads to significant space saving. Note also the rational nature of "picotage" and "dépicotage" taking place

  perpendicular to the web and with a positive control

  tive. The device according to the invention is capable of treating everything

2 581086

- 17 -

  continuous filament tow, curled or not, of artificial

or synthetic.

  The nonwoven web obtained can be used in the range

  usual use of non-woven articles, for example:

  drapes, coatings, etc.), coating medium, clothing, upholstery or reinforcement (in clothing or bedding), industrial use, etc. It can be used for the production of composite laminates by stitching or other means to other carriers, textile or otherwise. It is also possible to spread several superposed cables, for example of title, aspect (curly, not

curly) and / or different colors.

  Obviously, the invention is not limited to the example

  describes but encompasses other forms of achievement of

  parts of the machine, provided that they remain in the frame

of the general definition.

- 18 -

Claims (7)

R E V E N D I C A T I 0 N S   1 / - Device for spreading a continuous filament cable, characterized in that it comprises at least one spreading assembly comprising at least in combination: - a drum driven in rotation, elongated extensible elements integral with rotation of   drum, arranged on the periphery of the latter according to genera-   each member being provided with at least one row of outwardly facing pins; means for subjecting the elongated members to a plurality of successive alternating phases of extension and retraction during a revolution of the drum; feeding the cable to the extensible elongated elements and means for taking up the spread cable; means for subjecting the cable to the action of the pins during the extension phases and to subtract them from their action; during the retraction phases.   2 / - Device according to claim 1, characterized by the   the means for subjecting the elongated   Several successive alternating phases of extension and retraction include:   - a series of crank-rod systems mounted at both ends   of the drum, each associated and connected at the end of at least one extensible elongated element, - a fixed ring gear coaxial with the drum and disposed at each of the two ends thereof, - satellites associated with each connecting rod system. crank ensuring the rotation of the crank from the crown corresponding tooth. - 19 -   3 / - Device according to claim 2, characterized in that each crank-crank system is associated and connected to the end of a single extensible elongated member so that a round trip of the connecting rod corresponds to a extension-retraction cycle. 4 / - Device according to claim 2, characterized in that each connecting rod-crank system is associated and connected to the end of two elongated extensible consecutive elements so that a round trip of the connecting rod corresponds to a cycle extension-retraction and that when an element is in   extension, the other associated element is in retraction.   / - Device according to one of claims 1 to 4,   characterized by the fact that the means for feeding the cable to the extensible elongated elements comprise a bent bar and that the recovery means of the spread cable comprises a pair of call rollers.   6 / - Device according to one of claims 1 to 5,   characterized by the fact that the means for subjecting the cable to the action of the pins during the extension phases and for the   subtract from their action during the retraction phases   tent: - a lifting member of the cable adjacent and parallel to each elongated extensible element,   a fixed control cam disposed at each of two ends   coaxially with the drum, said cam being provided with a cam path having sectoral zones   repetitive, each corresponding to an extension cycle-   retraction, - a lever associated with each end of each lifting member of the cable, said lever being on the one hand hinged to the drum, on the other hand, connected to the cam path and to the body of uprising. 258108 6 - 20 -   7 / - Device according to one of claims 1 to 6,   characterized by the fact that each extensible elongated element is   constituted by at least one strap of elastic material.   8 / - Device according to one of claims 1 to 7,   characterized by the fact that to each elongated extensible element are associated two slides in direct or indirect contact with   he, said slides being actuated by the submissive means   both the elongated member expandable to the extension and retraction phases, and assist the deformation of said elongated member at during these two phases.   9 / - Device according to one of claims 1 to 8,   characterized by the fact that it comprises several sets according to   Claims 1 to 8 arranged one after the other.   / - Device according to claim 8, characterized by the   it comprises three sets according to claims 1   to 8 whose axes are arranged according to the vertices of an equilateral triangle.