FR2839321A1 - METHOD AND DEVICE FOR KNITTING TUBULAR ARTICLES INCLUDING AN ELASTIC FIBER, AND ARTICLE PRODUCED THEREBY - Google Patents

Abstract

The present invention relates to a method of knitting gloves and similar articles including elastic fibers in their texture, as well as to a device implementing the method and to a product obtained by this method. The invention consists of an article knitted on a loom. to be knitted in a straight line and comprises at least one tubular part knitted from a plurality of yarns comprising at least a first yarn, called the ground yarn, and a second yarn, called the elastic yarn, inserted at a non-zero tension and substantially constant. The elastic yarn is made from natural or artificial rubber or elastane or a material having similar elasticity and deformation capacity.

Description

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  The present invention relates to a process for knitting gents and the like, including elastic fibers in their texture, and a method for knitting tubular articles including an elastic fiber.

  device implementing the method and a product obtained by this method.

  The articles of the present invention are articles made by knitting a fabric from one or more firs. These articles can present a knitting mode forming different types of "armor", ie structure and spatial organization of the son or yarns inside the knitted fabric. One of the most common weaves is, for example, the so-called "jersey" and has many knitted

variants more or less close.

  The present invention applies to knitted articles so as to obtain a shape comprising one or more tubular portions obtained directly during knitting, ie without the need to close again.

  lietoffe, for example by sewing or gluing, to obtain this tubular shape.

  Current productions in this category are, in particular, all types of socks (94) or teats or mittens, when they are

  made in tubular form directly to knitting.

  Other more complex shaped productions falling within this category include all types of gents (91) or mittens (92), or socks (95) with one or more toes separated, when at least one tubular portion is made in tent such directly to the knitting, for example to form a finger (911 to 915, 921 to 925) or a toe (951 to 955) or a wrist (916, 926) or a sleeve (917), or a cuff (93) with Finger as described in FR02 02572. These articles may also include sleeves (917) or tubular parts dating back more

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  or less far away on the member to cover, such as payrolls or teas

or separate toe tights.

  Such articles of clothing may be used for reasons of comfort or aesthetics, but may also include fibers of specific technical characteristics for use in protection,

  security, or efficiency, especially in the industrial field.

  Although relating largely to articles of clothing of the human or animal body, similar articles may be used to cover various objects or devices, and fall within the scope of the invention when they comprise forms tubular knitted

  likely to be performed by the same types of machines.

  In all of the present description, the term "article knitted"

  tubular shapes >>, or <knitted glove item >> will thus be used for

  designer ['set of items specified above.

  In the field of the manufacture of knit yarn garments, it is known to use machines, or knitting machines, specific, which allow the realization of one or more tubular shapes, in a continuous operation. Such articles may comprise a single tubular shape such as socks, or several tubular shapes such as gents, mittens, or socks with separate toes. These different tubular shapes may possibly be made separately and then assembled together, or made continuously during knitting. Such articles may also include extensions such as a cuff or sleeve, covering all or part of the coated limb, eg forearm or arm. Such sleeves can be made as integral extensions to the legs or as separate items.

usable in themselves.

  Machines performing knitting operations, as will be explained later with reference to the figures, are called knitting

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  rectilinear, and wind very specially adapted to this type of form. This type of work is specialized to the point that some wind machines for example specially designed to knit in parallel the two items of a same padre of gents. These machines can often be directly parametrized to choose the size of the article to be produced, so as to make any choice

  which different sizes of the same article model.

  These machines have also been perfected and adapted in a specific way to achieve a complex shape in a continuous operation. For example, for the production of a gent (91), the tubular shapes (912 to 915) of the different fingers are made separately but on the same machine from the end, then joined together once their length is sufficient, for change from knitting the four separate fingers to the knitting of the palm, then join it with the thumb (911) to form the big palm (910) then the wrist (916). Such a mode of knitting is in particular

described in patent FR 02 02572.

  In such machines, the yarn hangs by the needles is device of a coil in vertical position. This wire then passes through a docking position, or it is piece by mechanical means so as to maintain a sufficient voltage. This wire then passes through a return device called "fisherman" system, which damps the voltage variations occurring during wire calls, by the needles at each change of direction of the knitting carriage. The thread then passes through a guide-fir mounted on a sliding system driven by a carriage which guides it in front of the needles of each needle, at the

  as the progress of the knitting progresses.

  According to the products to be manufactured, several wires can be devices of several coils, and brought in the same way, con to the guide-fir to be taken together by the needles. Some of these threads can also be taken only by certain needles, for example to make an edge or a zone having dimensions, by inserting an elastic thread taken by a needle on

  trots, or to achieve different mesh effects in the texture of the knit obtained.

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  Some of these threads may also be guided by a guide-fir to "vanish", so as to reveal only one side of the texture obtained,

  for example for reasons of comfort or aesthetics.

  With a knitting rectilinear, as commonly used to make such knitwear items knitwear, it is possible to use one or more firs, so-called bottom threads, knitted together by needle fits screwed. These wind needles supported and guided in parallel grooves

  formed on the surface of a support, the set constitutes a "bed">.

  In many applications, it is possible for some threads to be hooked by only a portion of the needles of each needle, while other ground son will be hooked by other needles or by all. By using a wool ground yarn or the like and a yarn endowed with a certain elasticity, it is then possible to make a fabric which some regions have dimensions allowing elastic deformation of the fabric by extension perpendicular to the dimensions. Such a technique is used in particular to allow certain parts of a clothing to be tightened on the member to be coated, in order to keep the clothing in place. An edge with such odds is commonly made at the end of a sock or gent. Such odds are carried out using an elastic bottom thread, hooks by only certain needles, for example because

a trotter.

  Now, such threads are usually quite thick and sheathed or "guipes" in a non-elastic fiber braid, and of an unsightly aspect. In addition knitting in dimensions gives an elasticity in one direction, matching

  a significant thickness of the textile and low flexibility.

  One of the aims of the invention is to propose knitwear having a more uniform elasticity in their structure, or a better flexibility and an unchanged appearance, to be able to make more comfortable articles and to benefit from a greater choice. appearance in terms of aesthetics.

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  To satisfy the clientele of a given article, it is most often

  necessary to manufacture and market different sizes of the same article.

  This variety of sizes makes it necessary to change a certain number of adjustments during manufacture. This variety also makes it necessary to refer and store more articles than if the number of sizes needed was less important, which is a cost at all stages of the design and manufacture of the product.

the sale to the end customer.

  One of the aims of the invention is to propose knitted articles having a greater elasticity in the structure of their fabric, thus making it possible to reduce the number of sizes to be produced.

the same article template.

  These goals are achieved by a knitted article, characterized in that it comprises at least one tubular part knitted from a plurality of son comprising at least a first wire, said ground wire, and a second wire, said wire. elasticity, inserted according to a non-zero tension and substantially constant, the elasticity thread being made from natural or artificial rubber or elastane or a material having an elasticity and a capacity of

similar deformation.

  According to one feature, the elasticity thread is included only in certain

regions of the article knit.

  According to a feature, the elasticity thread is a non-spandex yarn

sheath, vanise during knitting.

  According to a feature, the article is knit according to a gauge included

between 3 and 16 needles per inch.

  According to one feature, the article is knitted in a jersey weave

or derived from this armor.

  According to a feature, the article makes a garment for covering the hand or foot, and having at least two parts of tubular shapes meeting in at least a portion to form a tubular portion

  communicating with these two tubular parts.

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  According to a feature, the article is in the form of a gent, or a mitten, or a sock or teas, the article having at least two separate fingers. In addition, it is known to insert in the structure of a textile elastic fibers to give them some elasticity, but these techniques are not adaptable in the state knitting machines used to achieve such

articles with tubular shapes.

  Another object of the invention is to provide a device for knitting glove articles or tubular shaped shoes allowing the realization of articles having an improved elasticity of the structure itself

of their knitting.

  This object is achieved by a device for knitting tubular shaped articles, comprising means for supplying at least one wire, said ground wire, from a wire source to a mobile guide-fir, which presents this wire proximate the ends of a succession of parallel and coplanar aligned needles in one or more needle sockets each having a needle bed, each needle being movable along its longitudinal axis to seize the wire in hooking means and bring it back in the course of a call wire, passing through a loop of wire previously formed around this needle, forming a new loop overriding the previous, and then freeing him from hooking means and for sliding the same needle through this new loop, characterized in that it comprises supply means, said supplier, of at least one elasticity thread, elastane or natural rubber or artificia or a material of similar mechanical characteristics, from a source of elasticity thread to the guide-fir so that this elasticity thread is grasped by all or some of the needles at the same time as at least one thread of background, this supplier let escape the elasticity wire to the guide-fir by applying a non-zero tension and substantially constant during and between

  the successive operations of call of wire undergone by this thread of elasticity.

  According to a feature, the supplier comprises means for retaining the elasticity thread, these retaining means being controlled by control means reacting to the movement of the needles, or the guide-fir, or means for measuring the tension in the elasticity thread or in at least one background thread. According to one feature, the retaining means comprise a retaining mechanism in contact with the elasticity thread and moving simultaneously with it and without sliding, the displacement of this retaining mechanism being controlled by a set value to obtain for the voltage of

  this elasticity thread downstream of the supplier.

  According to a feature, the movement of the restraint mechanism is regulated by means of regulation responsive to maintain tension

  substantially constant in the elasticity thread at the exit of the supplier.

  According to a feature, the device comprises means for detecting a breakage or a drop in tension of the elasticity thread between the supplier's outlet and the guide-fir, these detection means being used by control means to control the stop knitting when the elasticity yarn is

  broken or that its voltage drops below a certain value.

  According to a feature, the device comprises means for capturing at least one computer or electronic data representing a set value for the regulation means acting within the provider

  to regulate the tension of the elasticity thread.

  Another object of the invention is to provide a method for producing, by a straight knitting machine, articles having an elasticity.

  improved structure of knitting.

  This object is achieved by a method of knitting tubular articles by at least one bed of parallel needles knitting at least one thread, characterized in that it comprises the provision of at least one yarn elasticity, in elastane or natural or artificial rubber or a material of similar mechanical characteristics, by means of supply, said provider, from a source of elasticity thread and up to a guide-fir

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  depla, cant near the extremities of parallel and coplanar needles, at least a portion of these needles gripping the elasticity thread and at least one ground wire in the same cycle of movement to form a new loop by bringing these son a through another loop previously formed in the same way, this elasticity thread being dispensed at the exit of the supplier in

  maintaining a non-zero voltage and substantially constant.

  According to a feature, according to a feature, the tension in the elasticity thread is maintained at

  a value ranging from 2 grams to 6 grams.

  According to a feature, the elasticity thread is presented in front of the needles by a guide-fir vanisage, the position of the elasticity thread relative to the thread in front of the needles to obtain a fabric or one of these two sons appear predominantly on one side, the other thread appearing predominantly

on the other side.

  According to a feature, the elasticity thread is presented in front of the needles by a guide-fir vanisage, this guide-fir vanisage being positioned so as to leave a maximum distance of 4.3 mm, according to the axis of the needles, between the guide-fir and the teeth formed by the upper edge of the bed support

wear the needles.

  The description of the types of articles concerned by the invention as well as

  of the prior art and features and advantages of the invention, refers to the accompanying drawings, in which: - Figure 1 shows a fragmentary view in eclate of a device according to the invention comprising a constant voltage supplier supplies in elastane yarn; FIG. 2 shows a detail of the knitting mode in jersey weave in the case of a single thread and without lapping; FIGS. 3a to 3e show examples of types of tubular shaped articles that can be produced according to the invention;

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  FIG. 4 represents a view, at the end, of the two needle beds and of the guide-fir to be vanished; - Figure 5 represents a perspective view of a guide-fir to vanish. The principle of knitting will first be described, in order to facilitate the

understanding of the whole.

  As illustrated in FIG. 1, a specialized machine operating according to the invention produces a tubular article 9 using two needle fits, or needle beds (1, 2), the needles being parallel and coplanar with one another. within a same bed. These two sets of needles, or needle beds, a rectilinear type wind and arranged opposite each other, often at an angle between the planes of the two beds, the end of the needles being directed towards the center and towards the top. These needles knit in a continuous operation the two faces of a form (9) flattened tubular, while ensuring a continuity between the two ends of these two needle fits. For this, knitting is done by running in front of the needles (1 1, 12, 13) a wire (36) driven by a guide-fir carriage (3), which each needle (11) hangs in turn in a hook (111) located at its end, in front, cant (d11) along its longitudinal axis. The hook (111) can be closed by closure means such as a pallet (112). Once it has caught the thread, the needle (12) moves back (d12) away from the path of the carriage, and thus brings the thread (36) through an old loop (m121), or mesh, formed around the same needle and belonging to a previous row made during a previous passage of the wire. The yarn attracts through this old loop (m121) then forms a new loop (m122), through which the needle slips when it returns to its rest position (13) after releasing the thread of the hooking means . The continuity between the two faces of the tubular form is ensured for example by the continuous and successive passage of the wire in front of the two needle fits, thereby guided by a guide-fir (3) movable on a carriage. The seizure of the thread by a back needle of a needle bed is then followed by the seizure of the thread by

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  a needle facing him in the other needle bed, which becomes the first

  needle of this other needle bed during this new passage.

  When knitting such tubular shaped articles, the invention proposes to integrate one or more elastic threads (37) directly into the main mesh, assembled with the thread or vanishes during knitting. By bringing to the guide-fir, at the same time as the one or more ground wires, such elastic thread held under a certain tension, the invention makes it possible to produce an article (91 to 95, FIGS. elasticity according to an extremely uniform structure, while directly knitting everything or

  part of the article in its definitive form.

  Such an elastic yarn, referred to as an elasticity yarn (37), is formed of at least one elastane fiber, or natural rubber, or a material with similar elasticity and deformation characteristics. Depending on the applications and the size or the desired deformation capabilities for the article of interest, this elasticity yarn can be chosen from different thicknesses, or titrations. In the embodiment described here and for the tests carried out by the inventor, this titration can be in a range from 28,000m / kg to 50,000m / kg or in a range from

from 22 decitex to 150 decitex.

  An article according to the invention is thus a knitted article comprising one or more tubular portions knitted directly in their tubular form, and comprising an elasticity thread included under a non-zero tension and substantially constant in all or part of the fabric. Such an article may in particular include such a thread of elasticity only certain regions. These regions may be chosen to provide reinforcements in certain parts, for example in the form of stripes or localized areas. These areas can be realized for reasons of solidity, comfort, tightness, or functions of characteristics specific to the son employed. It is possible, for example, to make scratch-resistant gears including electrically conductive wires, so as to avoid any discharge of static electricity when handling electronic components. The inclusion of an elasticity thread in these scratches can then make it possible to compensate for a greater stiffness of these regions, and thus preserve a certain comfort or

  certain holding of the fabric on the hand.

  These regions can also be made for aesthetic reasons, to obtain a different aspect of the fabric in these regions, or to obtain a deformation of the fabric producing a certain effect of shape or

  texture, for example gathers or pleats.

  An article according to the invention may comprise one or more son of elasticity, adjoining one or more background son. These ground son may be made of any material usually used for knitting such tubular articles. These bottom wires may in particular include materials based on aramid, meta-aramid, para-aramid, PBO, PBI, polyester, polyamide, cotton, wool, glass yarn, wire, polypropylene, chlorofibers, polyethylene, polyolefins,

acrylic, or viscose.

  Bottom yarns may comprise fibers of one or more materials intimately mixed, ie during manufacture or preparation of the yarn, before reeling and supplying the goods to the yarn.

knitting.

  The ground son, like the son of elasticity, can also be assembled or twisted during knitting, ie aprovisionnes from different coils but assembled before knitting, before the guide-fir or in the guide-fir. This assembly can combine several ground son between them, or several son of elasticity them, or a mixture of ground son and son of elasticite. Elasticity yarns as well as conventional yarns supplied by a

  conventional system can also be knitted by vanisage.

  A machine according to the invention, for directly knitting such articles (9) of tubular shape, is shown in Figure 1. In such a machine, the son (s) (36) bottom wind devices from coils (6) or

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  reels united. These bottom wires (36) then pass through a docking position, or a piece (5) of voltage adjustment retains them sufficiently to give them sufficient tension, for example to prevent them from becoming entangled. The bottom wires then pass through a guiding device retained by elastic means, for example a spring steel wire having a ring at its end, and called the fishing system (4). The bottom wires are then brought to guide-fir (3), which presents them together successively in front of each of the needles of the needle (1, 2). This fishing system has a large amplitude of movement which makes it possible to damp the variations of tensions in the bottom threads, during yarn calls due to the displacement (d3) of the guide-fir or to the traction (d12) of each needle ( 12) on the wire during his

movement cycle.

  Such a docking position is able to maintain a sufficient tension to prevent the son is entangled or ensure a uniform size between the various stitches of a fabric. However, when an attempt is made to replace a ground wire by an elasticity wire, it is evident that this device does not make it possible to obtain a sufficiently constant voltage during operation to ensure a homogeneous distribution of the wire. wire

elastic in the fabric.

  In the same way, the regularity varies in a way that is unpredictable when the mean tension in the wire is changed. In addition, such a system of frictional retention in a room is unstable depending on the atmospheric conditions and the composition or the surface state of the elastic fiber. This docking system therefore does not make it possible to determine precisely a quantized value for the voltage, nor to keep a

  same setting over a significant period of time.

  In order to obtain regularity and sufficient precision in the tension of the yarn (37) of elasticity, the invention provides an arrival circuit different from that which exists on such knitting machines. In the embodiment carried out by the inventor, the elasticity thread (37) is dispensed to the fir-guide (3) according to a

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  determined and constant voltage by a wire supply device, said

supplier (7).

  This supplier comprises means for retaining the elastic yarn, which are transported by means of electronic processing. These wind restraint means are controlled so as to maintain a constant and non-zero tension in the elasticity thread (37) at the exit of the supplier (7). This control can be done for example by a constant-force motor or a stepper motor controlled by the tension of the yarn at the output or the amplitude of the movements of the different parts performing the knitting. This voltage can be programmed digitally by entering a setpoint value, by means of

  typed as a keyboard (not shown).

  In one embodiment, these retaining means comprise at least one piece (72) of revolution on which the elastic thread is in contact without sliding, and whose movement is retained or controlled so as to vary the tension of the thread . This contact without slip can for example be obtained by winding the elastic wire in one or more turns (721) around this piece (72) revolution. The supplier comprises means (73) for detecting the output voltage of the wire, to which wind is enslaved

  the retaining means through the intermediary of the processing means.

  In a variant, the movements of these retaining means are subject to the movements of the knitting industry, for example depending on the

movement of the guide-fir.

  In a variant, the revolution piece (72) is retained in its accompanying movement of the wire by an actuator or a motor applying a constant angular force and regulated according to the value of

  setpoint input for the voltage to be obtained.

  In the case of a rupture of the elasticity thread downstream of the supplier, or of a too large variation of its voltage, the supplier comprises connected detection means (75) to control means apses a

  trigger a stop of the knitting profession.

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  Depending on the application, it is possible to use a guide-fir type guide-fir to vanish, receiving the elasticity thread so as to obtain a knitting including this elasticity thread by vanisage. The vanisage is a known method of knitting, which consists in keeping a wire, called a plaiting wire, in a specific and distinct position with respect to the bottom wires, within the guide-fir, for

  get this thread visible only on one side of the fabric.

  Such a guide-fir (3) to be vanized is shown in Figure 5, and comprises two different passages for the son to knit. A passage (306) of ground wire has a substantially circular section of conduit, while the passage (307) of wire to vanize has the shape of an elongated shape in the direction of movement of the guide-fir and exceeding each dimension of the passage of ground wire. Thus, during the displacement of the guide-fir, the wire to be vanished (37) will be driven by its inertia at the end (307g, 307d) of the slot located behind the wire (36)

  background, regardless of the direction of displacement.

  This specific position at the exit of the guide-fir, for example behind the background son relative to the direction of displacement of the carriage driving the guide-fir, makes it possible to obtain that the needles hang this vanishing wire always in the same position by relative to the thread, for example by a specific and distinct part of the needle. The plaiting wire may for example be folded by the pallet (112) movable which closes the hook (111) of the needle, instead of passing of itself inside the hook. Hooking the plaiting wire with a part of the needle separate from that hanging the ground wire, or at a different time, allows to fuse the ground wire and the plumbing wire still in the same position. one compared to the other. This peculiarity makes it possible in particular to make an arm ure or the wire of van isage is visible

only one side of the fabric.

  In the method according to the invention, it may be of interest to insert the elasti cite wire by vanishing, for example to the r nterieu r of the tubular form. This makes it possible, for example, to keep the bottom threads turned towards the outside, and thus to obtain, outside the article, the aesthetic rendering desired when selecting these background threads. The fact that the elastic fibers are all on the same face of the fabric also allows a good sliding of the

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  mesh between them during the extension, which ensures a good flexibility

  and reg u the rite to the stuff when deformed.

  In order to obtain good performances with regard to the regularity and reliability of the method, the invention also proposes to modify certain parameters of the knitting machines specifically used for such glove articles in the case of an insertion of elastic thread by vanishing. The distance between the needles (12, 13) and the furring guide fir is a factory-set parameter that can affect the quality and regularity of the mesh. In order to obtain that the needles hang the elasticity thread with sufficient reliability, in particular at the time of each firm departure,

  The invention proposes to reduce this distance substantially.

  Indeed, during a knitting with vanishing, the plaiting wire is most often re cu the needle later than the bottom wire, which makes it more delicate hooking by the hook (111). Usually, this hooking is facilitated or ensured by closing the pallet (112) which closes the hook, this pallet being folded by the thread constitute the mesh (m121) preceding when the needle (12) is withdrawn ( d12) to create a new loop (m122). However, to achieve an article comprising a thread elasticity vanize throughout its structure, or in end portions, it may be necessary to start a knitting by inserting this thread of elasticity from the beginning. Such a beginning is called a firm departure and uses a specific knitting mode to avoid demarcation of the edge so created, whether at a closed end of a

  tubular shape or on an edge to remain free.

  During such a firm departure, the needle does not wear K mesh precedence >> which can close the valve (112) of the needle on the elasticity thread (37). Consequently, the elasticity thread must be grasped only by the hook of the needle, which necessitates a different adjustment, including in particular a fine and maximum approach of the guide-fir with respect to the advance.

needles in work.

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  By way of example, this relaxation of the guide-fir with respect to the needles has been tested and will be quantified here for a knitting machine of the Matsuya SGT (registered trademark) type, with a gauge of 10 needles per inch and capable of producing articles up to to sizes L and LL. On this machine, the modified distance will be defined by the free space, in the axis of the needles, between the outer surface of the guide-fir of plastering and the upper edge (100) of the edge nearest the support (10) receiving the needles (11) of each needle bed (1), as illustrated in Figure 4. On a machine of this type installed with ['option

  vanishing, the value of this distance is originally about 4.9 millimeters.

  In the experiments carried out, good results were obtained by reducing this distance to a value of less than 4.5 mm, and in particular

4.3 mm.

  For the elastane titrations mentioned above, a supplier of Memminger EFS type (registered trademark) has given good results with a tension of 2 to 3 grams. For other types of articles or to obtain articles of a different "hold", the tensions used may also

  go up to a value of 4 to 6 grams.

  It must be obvious to those skilled in the art that the

  present invention allows modes of realization under many

  other specific forms without removing it from the field of application of the invention as claimed. Consequently, the present embodiments must be considered as illustrations, but may be

  modified in the field defined by the scope of the attached claims, and

  The invention should not be limited to the details given above.

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Claims (17)

  1. Article (91, 92, 93, 94, 95) knit, characterized in that it comprises at least one tubular portion (910 to 915) knitted from a plurality of yarns comprising at least one first yarn (36 ), said bottom thread, and a second thread (37), said elasticity thread, inserted according to a non-zero and substantially constant tension, the elasticity thread being made from natural or artificial rubber or elastane or a material with elasticity   and a similar deformation capacity.   2. Article according to claim 1, characterized in that the thread   elasticity is included only in certain regions of the knitted article.   3. Article according to one of claims 1 to 2, characterized in that   the elasticity thread is a non-sheath elastane thread, which is used during knitting.   4. Article according to one of claims 1 to 3, characterized in that   it is knit with a gauge of between 3 and 16 needles per inch.   5. Article according to one of claims 1 to 4, characterized in that   that he is knit in armor in jersey or derived from this armor.   6. Article according to one of claims 1 to 5, characterized in that   he makes a piece (91, 92, 95) of clothing intended to cover the hand or the foot, and having at least two parts (911, 912, 921, 922, 951, 952) of tubular shapes joining together in at least a portion (910, 920, 950) for   forming a tubular portion communicating with these two tubular portions.   7. Article one of claims 1 to 6, characterized in that   has the shape of a gent (91), or diune mitaine (92), or a   sock (95) or teas, article comprising at least two separate fingers.   8. Device for knitting tubular shaped articles, comprising means for supplying at least one wire (36), said ground wire, since a 1 8 2839321   wire source (6) up to a movable guide-fir (3), which has this wire near the ends of a succession of parallel-aligned and coplanar aligned needles in one or more fits (1, 2 ) needles each carried by a needle bed, each of these aiguiiles (11, 12, 13) being movable (d11) along its longitudinal axis to seize this wire in means (111) of attachment and bring it back ( d12) back during a thread call, passing it through a loop (m121) of yarn previously formed around this needle (12), thus forming a new loop (m 122) exceeding the previous , then by releasing it from the hooking means and to slide this same needle through this new loop, characterized in that it comprises means of supply, said supplier (7), of at least one thread (37) of elasticity, of elastane or natural or artificial rubber or of a material of similar mechanical characteristics, from a source (8) of elasticity thread up to the guide-fir (3) so that the thread (37) of elasticity is grasped by all or part of the needles at the same time as at least one thread, this supplier letting escape the thread elasticity towards the guide-fir by applying a non-zero and substantially constant tension during and between   successive thread call operations undergone by this elasticity thread.   9. Device according to claim 8, characterized in that the supplier (7) comprises means (72) retaining the elasticity thread, these retaining means being controlled by control means responsive to the movement of the needles, or the guide-fir, or means of   measuring the tension in the elasticity thread or in at least one thread.   10. Device according to one of claims 8 to 9, characterized in that   that the retaining means comprise a retaining mechanism in contact with the elasticity thread (37) and moves simultaneously with it and without sliding, the displacement of this retaining mechanism being controlled by a set value to be obtained for the tension of this elasticity thread downstream of the supplier. 1 9 2839321   11. Device according to one of claims 8 to 10, characterized in   that the movement of the restraint mechanism is regulated (74) by regulating means responsive to maintain a substantially   constant in the elasticity thread at the output of the supplier.   12. Device according to one of claims 8 to 11, characterized in   it comprises means (73) for detecting breakage or drop in tension of the elasticity thread between the supplier's outlet and the guidefir, these detection means being used by control means for controlling (75) I stopping of knitting when the elasticity thread is broken or when   its voltage drops below a certain value.   13. Device according to one of claims 8 to 12, characterized in   it comprises means for entering at least one computer or electronic data representing a set value for the regulation means acting within the supplier (7) to regulate the tension of the wire 1 5 of elasticity.   14. Process for knitting tubular articles by at least one bed (1, 2) of needles parallel to each other knitting at least one thread (36), characterized in that it comprises the provision of at least one elastic yarn (37), made of elastane or natural or artificial rubber or of a material of similar mechanical characteristics, by means of supply, said supplier (7), from a source (8) of yarn elasticity and up to a wire guide (3) moves, cant near the ends of needles (11, 12, 13) parallel and coplanar, at least a portion of these needles seizing the elasticity thread and at at least one ground wire in the same cycle of movement to constitute a new loop (m122) by bringing these son through another loop (m121) previously formed in the same way, con this elasticity thread being dispensed at the exit supplier by maintaining a non-zero voltage and substantially constant. 2Q 2839321   15. ProcAdA according to claim 4, characterized in that the tension in the fl (37) of AlastcitA is maintained as a value. 2 gmm 6 gmmm-.   16. PcddA according to [one of the revendicaDons 14 15, caractAsAA in that the fll (37) of AlasticltA is prAsentA in front of the needle psr a vanlsage guide-fll, the position of the AlasticitA fll by rappoM to the wire (30) nd in front of the needles (1,2) allowing to obtain an Ato where one of these two threads appears to me a mimme flimme mimme face ss. 17. Procenda according to claim 14 16, characterized in that the yarn (37) of ElasticityA is prasentA in front of the needles by a guide-fir vanisage, this guide-fl (3) vanisage 61ant poshionnA a laser way a maximum length (dv) of 4.3 mm, according to the axis of the tweezers, between the guidefl (3) and the teeth (101) rmAes by supernal rarity of the suppod (10) de nture