EP0534915A1 - Procedure for automatical sewing of two stockings forming a panty hose and machine for carrying out the procedure - Google Patents

Abstract

To obtain the automatic sewing of two stockings to form a pair of tights, involving the manual loading of the stockings onto two corresponding twin horizontal and superposed flat forms, bringing the forms together with the stockings slipped on them and cutting a longitudinal portion, spreading the forms 1 apart, with the stockings cut, and sewing the edges T1, T2, joining the forms together and unloading the sewn tights, the following operations are carried out: positioning the elastic edge of the two stockings in the same predetermined position by grasping the elastic edge of the stocking which is located at a greater distance from the predetermined position and by causing it to slide towards this position, then by grasping the elastic edge of the other stocking and by causing the two elastic edges thus aligned vertically to slide simultaneously into the predetermined position; positioning the upper part of the two stockings in the same predetermined position by accumulating it until a reference line of the stockings reaches a predetermined position, then by slipping them off over an identical predetermined length; spreading the forms apart at 180 DEG , with the stockings partially cut longitudinally, and sewing the edges on two straight portions T1, T2, one in the extension of the other: the sewing of one portion T1 being simultaneous with that of the other portion T2. <IMAGE>

Description

The present invention relates to a method and a machine for the automatic sewing of two stockings to form a pantyhose.

We know from patent IT 942 878 a process for sewing tights which provides for threading two stockings on two flat shapes, twinned, superimposed corresponding; to juxtapose said forms with the stockings threaded; to cut longitudinally a portion of the two stockings thus kept juxtaposed; to separate the two forms with the two stockings thus cut out; to sew together the two edges thus separated; to join the forms with the stockings thus sewn and forming the tights; discharge the tights thus obtained. More particularly, in accordance with said known method, it is planned to sew the two stockings with a single sewing machine, for which the manufacturing time of the pantyhose is strictly conditioned by the sewing time because it represents the longest time in the whole cycle.

Some attempts to reduce the formation time of tights have sought to increase the working speed of sewing machines, but now the limit reached is considered mechanically impossible to reduce.

Other improvements concerned the automatic positioning of the two stockings on the corresponding shapes before sewing, but these also did not achieve the objective of significantly reducing the formation time of the manufactured product.

The main object of the present invention is precisely to considerably reduce the time for automatic formation of tights by using the same sewing machines as those available today.

Another object of the invention is to free the operator responsible for loading the correct positioning of the stockings on the forms, by automatically and quickly, but with great precision, the correct positioning, that is to say the alignment vertically of the elastic edge and the body of the two stockings before making the longitudinal cut.

These results have been achieved in accordance with the invention, as regards the positioning of the elastic edge of the two stockings, by adopting the idea of grasping the elastic edge of the bottom which, of the two, is on the corresponding shape at a distance larger with respect to a predetermined position, to slide it towards this position, then to reach and grasp the elastic edge of the other bottom and finally to slide together the two elastic edges thus aligned to the predetermined position . Regarding the positioning of the body of the two stockings, adopting the idea of accumulating each stocking on the corresponding shape until the line of separation between the bottom body, whose fabric has a higher density, and the leg, whose fabric has a lower density, reaches a predetermined position, and then unthread the two bodies of the two forms together with a predetermined length. And for the seam of the two stockings, adopting the idea of dividing the seam - into two portions, by sewing the two portions simultaneously using two automatic sewing machines.

The advantages obtained thanks to the present invention essentially consist in the fact that it is possible to drastically reduce the manufacturing time of the tights while retaining the maximum execution precision, by reducing the time of the whole cycle of operation within four seconds, which represents a result never before achieved; that it is possible to carry out double stitching by leaving the inguinal zone of the tights seamless for the application of a bellows; that it is possible to program the sewing length of each sewing machine; that it is possible to subdivide the seam into two separate stations by sewing the second portion starting from a point in the first portion already sewn; that it is possible to vertically align the elastic edge and the body of the stockings with the corresponding shapes, allowing the operator to load them without positioning and therefore faster.

These advantages and characteristics of the invention as well as others will be more and better understood by each person skilled in the art in the light of the description which follows and with the aid of the appended drawings given by way of practical example of a possible embodiment of a machine in accordance with the invention, but not to be considered in the limiting sense; drawings in which FIG. 1 shows a schematic plan view of a carousel machine with several stations, for automatic sewing in a single station, according to the invention; FIG. 2 shows a detailed axonometric view of the means for the vertical alignment of the two bottoms; FIG. 3 shows the longitudinal sectional view of the detail in FIG, 2 with the bottoms in a possible initial position for manual loading; FIG. 4 shows the detailed view of FIG. 3 with the means for aligning the elastic edges engaged on the elastic edge of a stocking and with the means for aligning the bodies of the two stockings in the phase of accumulation of these on the forms; FIG, 5 shows the plan view of the detail of FIG. 4; FIG. 6 shows the detailed view of FIG. 3 with the means for aligning the elastic edges engaged on the elastic edge of the two bottoms and with the means for aligning the deactivated bodies; FIG. 7 shows the plan view of the detail of FIG. 6; FIG. 8 shows the detailed view of FIG. 3 with the two elastic edges permanently aligned vertically and with the means for aligning the bodies at the end of alignment; FIG. 9 shows the plan view of the detail of FIG. 8; FIG. 10 shows the detailed plan view of the sewing station with the two sewing machines before sewing; FIG. 11 shows the simplified side view of the detail of FIG. 10; FIG. 12 shows the detailed view of FIG. 10 with the two sewing machines at the end of a continuous seam; FIG. 13 shows the detailed view of the cutting means of the net chain remaining from the first seam portion; FIG. 14 shows the detailed view of FIG. 10 with the two sewing machines at the end of an interrupted seam; FIG. 15 shows the enlarged detailed view of the sewing interruption zone; FIG. 16 shows a schematic plan view of the variant of the machine of FIG. 1 for sewing in two successive stations.

• positionner, c'est-à-dire aligner verticalement, le bord élastique des deux bas dans une position prédéterminée des formes;
• positionner le corps des deux bas dans une même position prédéterminée des formes et en respectant l'alignement précité des bords élastiques;
• effectuer la coupe longitudinale d'une même longueur des deux corps des bas ainsi positionnés;
• écarter à 180° les formes avec les coprs des bas ainsi découpés et effectuer la couture rectiligne des bords de tissu dépassant des formes ainsi écartées;
• réunir et ouvrir les formes avec les deux bas ainsi cousus et décharger le collant ainsi obtenu.

Reduced to its essential structure and with reference to the accompanying drawings, a process for the automatic sewing of two stockings to form a pantyhose according to the invention and comprising the loading by hand of a portion of the upper part of two stockings on two forms flat, twinned, horizontal and superimposed, the approximation and tightening of said forms with the interposed area of the stockings, the section of a longitudinal portion of the area of the stockings thus juxtaposed, the spacing of the shapes with the stockings thus cut out by aligning their edges, includes:

• position, i.e. align vertically, the elastic edge of the two stockings in a predetermined position of the shapes;
• positioning the body of the two stockings in the same predetermined position of the shapes and respecting the aforementioned alignment of the elastic edges;
• make the longitudinal cut of the same length of the two bodies of the stockings thus positioned;
• spread the shapes 180 ° with the cops of the bottoms thus cut and carry out the rectilinear sewing of the edges of the fabric protruding from the shapes thus separated;
• join and open the shapes with the two stockings thus sewn and unload the tights thus obtained.

Advantageously, in accordance with the invention, it is planned to carry out the alignment of the elastic edges and the positioning of the bodies of the two stockings in the same work station and simultaneously, to sew the two body portions in the same station or in two consecutive stations.

More specifically, said vertical alignment of the two elastic edges is obtained with operational means with reciprocating horizontal movement, the outward travel of which is intended to detect the position of the first elastic edge encountered, that is to say that of the two bottoms which is each time loaded closer to the predetermined alignment position, then reaching and grasping the second elastic edge, i.e. the bottom edge which was loaded further from the predetermined alignment position, and the return stroke of which is intended to move said second elastic edge and said first elastic edge thus aligned with each other in sliding direction until they reach the predetermined alignment position.

In addition, the identical positioning of the body of the two bottoms on the forms is obtained with operational means with reciprocating horizontal movement, one race of which is intended to accumulate the tissue of the body on the corresponding form and the other course of which is intended to thread the body over a predetermined length from the dividing line between the body and the lower leg.

With regard to the stitching of the edges of the cut body of the two stockings in accordance with the invention, it is provided, if the stitching that is to be obtained is continuous, that each of the two sewing machines performs a corresponding stitching the length of which is slightly greater than half the length of the total seam, which results in a double seam, of variable length as desired, in the middle zone, that is to say in the inguinal zone of the tights.

Otherwise, if the seam you wish to perform is discontinuous, it is expected that each of the two sewing machines will perform a seam the length of which is slightly less than half the length of the total seam, which results in an interruption of variable length as desired in the middle zone, that is to say in the inguinal zone of the tights.

The sewing of the two portions by the two sewing machines can - in accordance with the invention - be carried out in a single processing station and therefore on the same manufactured product or differently in two consecutive processing stations, and in this case on two products manufactured separately, but always simultaneously.

• des moyens à carrousel 10 tournant horizontalement par intermittence, avec un arrêt identique dans chaque station de traitement, avec plusieurs paires de formes plates 1, horizontales, jumelées et avec possibilité d'écartement, pour supporter une portion tendue de paires de bas 2 juxtaposées, enfilées dessus à la main sans positionnement;
• des moyens pour l'alignement en verticale du bord élastique 20 des deux bas 2 dans une position prédéterminée par rapport aux formes, avec un chariot 3 à mouvement horizontal alternatif le long des formes 1, lequel est muni de deux capteurs optiques 30, un placé au-dessus et l'autre au-dessous des formes 1, pour la détection du bord élastique 20 du bas supérieur et respectivement inférieur, et deux mâchoires 31 mobiles verticalement, l'une agissant par dessus le bas supérieur et l'autre agissant par dessous le bas inférieur, lesquelles sont asservies à un cylindre pneumatique respectif 32 pour se déplacer vers une tablette horizontale 33 solidaire du chariot 3, passant dans l'espace 11 existant entre les formes 1 et à la même distance de chacune d'elles et laquelle sert de mâchoire fixe pour permettre le blocage de chaque bas, de manière indépendante, après activation de chaque mâchoire mobile 31;
• des moyens pour le positionnement du corps 22 de chaque bas 2 dans une même position prédéterminée sur la forme correspondante, avec un premier capteur optique fixe 40 pour la détection de la présence des bas sur les formes et avec deux autres capteurs optiques 41, l'un supérieur et l'autre inférieur, pour la détection de la ligne 23 de séparation entre le corps 22 et la jambe 24 du bas supérieur et respectivement inférieur; avec deux groupes 4 jumelés de déplacement des bas 2 dans un sens et dans l'autre sur les formes correspondantes, chaque groupe étant équipé d'une courroie à canal 42 sans fin horizontale, montée sur un bras 43 oscillant horizontalement avec mouvement alternatif pour engager et respectivement libérer le bord d'extrémité 12 en saillie vers l'extérieur de la forme correspondante: chaque groupe 4 étant asservi, en outre, à un mouvement vertical alternatif pour se placer dans une position hors-service, c'est-à-dire avec la courroie 42 soulevée/abaissée par rapport au plan de la forme correspondante à engager, ou respectivement en position de travail, c'est-à-dire avec la courroie coplanaire avec la forme correspondante et en prise avec celle-ci;
• des moyens pour la couture des bords 25 des corps 22 découpés et alignés, avec deux machines à coudre 5,50 prévues dans une même station du carrousel 10, lesquelles sont mobiles sur une voie 51 parallèle à la direction XX de couture qui permet leur course en tandem dans la course aller, c'est-à-dire celle de couture (de droite à gauche sur la Fig. 12), et dans celle de retour à vide, et de plus, sont mobiles, indépendemment l'une de l'autre, dans la direction perpendiculaire à la voie 51 pour effectuer la course d'entrée sur et de sortie de la ligne XX de couture. Plus précisément, il est prévu, conformément à l'invention, la possibilité d'effectuer une couture continue ou bien discontinue. Pour une couture continue, la première machine à coudre 5 effectue la couture sur une première portion T1 et la deuxième machine à coudre 50 sur une deuxième portion T2, la première portion T1 se terminant au-delà du milieu de la couture globale et la deuxième portion commençant avant le milieu de manière que les deux portions présentent une couture double en correspondance de la zone centrale, c'est-à-dire de la zone inguinale du collant. Dans ce cas, des moyens de coupe 6 sont prévus pour découper la queue 60 de la première portion T1 de couture.

As regards the machine for the automatic sewing of two stockings to form a pantyhose according to the method according to the invention, this machine comprises:

• carousel means 10 rotating horizontally intermittently, with an identical stop in each treatment station, with several pairs of flat shapes 1, horizontal, twinned and with the possibility of spacing, to support a stretched portion of pairs of stockings 2 juxtaposed, strung on by hand without positioning;
• means for the vertical alignment of the elastic edge 20 of the two bottoms 2 in a predetermined position relative to the forms, with a carriage 3 with reciprocating horizontal movement along the forms 1, which is provided with two optical sensors 30, one placed above and the other below forms 1, for edge detection elastic 20 from the upper and respectively lower bottom, and two jaws 31 movable vertically, one acting above the upper bottom and the other acting below the lower bottom, which are slaved to a respective pneumatic cylinder 32 to move towards a horizontal shelf 33 secured to the carriage 3, passing through the space 11 existing between the shapes 1 and at the same distance from each of them and which serves as a fixed jaw to allow the blocking of each bottom, independently, after activation of each movable jaw 31;
• means for positioning the body 22 of each stocking 2 in the same predetermined position on the corresponding shape, with a first fixed optical sensor 40 for detecting the presence of the stockings on the shapes and with two other optical sensors 41, the one upper and the other lower, for the detection of the line 23 of separation between the body 22 and the leg 24 of the upper and lower lower respectively; with two groups 4 paired to move the stockings 2 in one direction and in the other on the corresponding shapes, each group being equipped with a horizontal endless channel belt 42, mounted on an arm 43 oscillating horizontally with reciprocating movement to engage and respectively release the end edge 12 projecting outwardly of the corresponding shape: each group 4 being slaved, in addition, to a reciprocating vertical movement to place itself in an out-of-service position, that is to say say with the belt 42 raised / lowered with respect to the plane of the corresponding form to be engaged, or respectively in the working position, that is to say with the coplanar belt with the corresponding form and engaged therewith;
• means for sewing the edges 25 of the bodies 22 cut and aligned, with two sewing machines 5.50 provided in the same station of the carousel 10, which are movable on a track 51 parallel to the direction XX of sewing which allows their travel in tandem in the outward stroke, that is to say that of sewing (from right to left in Fig. 12), and in that of empty return, and moreover, are movable, independently of one of the 'other, in the direction perpendicular to track 51 to carry out the entry stroke on and exit from the seam line XX. More specifically, provision is made, in accordance with the invention, for the possibility of carrying out continuous or discontinuous sewing. For continuous sewing, the first sewing machine 5 sews on a first portion T1 and the second sewing machine 50 on a second portion T2, the first portion T1 ending beyond the middle of the overall seam and the second portion starting before the middle so that the two portions have a double seam corresponding to the central area, that is to say the inguinal area of the pantyhose. In this case, cutting means 6 are provided for cutting the tail 60 of the first seam portion T1.

For discontinuous sewing, the first sewing machine 5 sews on a portion T1 which ends before the middle of the total sewing and the second sewing machine 50 sews on a portion T2 which begins after said middle, so that the central zone, that is to say the inguinal zone of the pantyhose, is devoid of seam: this being advantageous for the successive application of a bellows.

It goes without saying that the length of the double seam in the case of a continuous seam and the interval between the two seams in the case of a discontinuous seam is variable as desired by adjusting the active stroke of the two sewing machines 5.50.

To facilitate the entry of the second seam 50 on the edges to be sewn, provision is made, in accordance with the invention, to arrange the two sewing machines in two separate processing stations (see FIG. 16) so that only the first sewing machine 5 operates in the first station to effect the first portion T1 of sewing and only the second sewing machine 50 operates in the second station to effect the second portion T2 of sewing by entering the edges 25 already partially sewn by the first sewing machine 5, which enters the fabric laterally.

If the stockings to be treated are made with a single density fabric or in any case without difference sensitive, it is foreseen, in accordance with the invention, to insert beforehand in the stockings a mark, that is to say a thread of color different from that of the fabric and in any case likely to be detected by the sensors 41 and to be used as the positioning limit of the bottom in relation to the length of the seam to be made.

Furthermore, in place of the two optical sensors 41 positioned on the longitudinal axis of the forms 1, it is provided in accordance with the invention to use two pairs of sensors 41, with a pair located above the arms of the form upper and the other pair located below the arms of the lower form: each of the four sensors 41 being associated with a displacement group 4 so as to be able to activate the corresponding belt 42 even separately from the belts 42 of the other groups 4. This turns out to be advantageous in order to allow the dividing line 23 of each bottom to take an arrangement always perpendicular to the axis of the corresponding shape.

The operation is as follows. An operator - in station A of the carousel 10 - puts on by hand, at random and without positioning them, two stockings on the two forms 1; with the rotation of a step clockwise from the carousel, the shapes stop in the next station B in which the two stockings undergo the alignment of the elastic edges and the positioning of the bodies in the following manner . The carriage 3, in its forward travel, that is to say to the left in FIG. 3, detects through the lower sensor 30 the elastic bottom edge 20 of the bottom closest (that is to say the one placed below in Fig. 3), but continues its course until intercept, by via the upper sensor 30, the most distant bottom edge 20; it stops there, the upper jaw 31 which blocks the upper bottom by means of the tablet 33 is actuated; after which the carriage moves back and as soon as it returns to the detected position of the elastic edge of the lower bottom, the lower jaw which blocks the lower bottom by means of the tablet 33 is actuated; then the carriage continues its return stroke with the two edges 20 aligned to the predetermined alignment position.
Simultaneously, as soon as each of the sensors 41 has detected the body 22 of the corresponding bottom, the belt 42 of the associated group 4 and which is in contact with the edge 12 of the corresponding shape 1 with interposition of the corresponding bottom, is actuated in the direction allowing thread the bottom onto the form to form an accumulation 26 of the bottom fabric and this until the sensor 41 of each bottom, after having detected the line 23 of separation between the body 22 and the leg 24 of the bottom, controls the spacing of the belt 42 of the form and its stopping. As soon as the two lines 23, that is to say the two bottoms, have been detected, the four belts 42 are again juxtaposed to the shapes and actuated in the opposite direction, that is to say scrolling of the stockings relative to the shapes, making the lines 23 move a predetermined length, but variable as desired, and at the end that they are aligned vertically in a predetermined position relative to the shapes 1 .
In the case where a stocking has been threaded over the corresponding shape so that the line 23 is on the shape and therefore in a position that cannot be detected for the sensor 41, the latter controls the corresponding strap 42 so that the bottom is unthreaded to the shape necessary for said line 23 to be detected by the sensor 41; after which the belt will thread the bottom of the predetermined length to bring the line 23 into the predetermined alignment position.
With a rotation of one step of the carousel 10, the shapes 1 with the two stockings thus positioned stop in, the station C in which the longitudinal section of a portion of the body is carried out; then, after another step of the carousel 10, the shapes 1 stop in the sewing station D. If two sewing machines 5.50 are provided in this station (see Fig. 13), these advance, under the control of the corresponding pneumatic cylinder 55, towards and to the edges 25 of sewing fabric, so that the first sewing machine 5 enters the fabric laterally and through the top of the edges, while the second sewing machine 50 enters directly and slightly before or respectively slightly after the middle of the total seam line, depending on whether continuous or discontinuous sewing is required. During sewing, the two sewing machines advance in tandem concord on track 51 under the control of known means; at the end of the seam, the two sewing machines go back, that is to say to leave the sewn edges and then return to the starting point on lane 51.

In the case where the two 5.50 sewing machines are provided in two separate stations D of the carousel 10 (see Fig. 16), the first sewing machine 5 sews the first portion T1 of tights and the second sewing machine 50 simultaneously sews the second portion T2 of another pantyhose.
In both cases, the complete sewing of the pantyhose is obtained in a time of approximately half that used until today with the known pantyhose sewing machines.

Claims (20)

1) Process for the automatic sewing of two stockings for the formation of a pantyhose and comprising the loading by hand of the stockings on two corresponding flat shapes, twinned, horizontal and superimposed, the bringing together of the shapes with the stockings threaded and the cutting of '' a longitudinal portion, the spacing of the forms with the cut-out stockings and the sewing of the edges, the joining of the forms and the unloading of the sewn tights, characterized in that it comprises the following operations: - position the elastic edge of the two stockings in the same predetermined position by grasping the elastic edge of the bottom which is at a greater distance from the predetermined position and sliding it towards this position, then by grasping the elastic edge of the another bottom and simultaneously sliding the two elastic edges thus aligned vertically to the predetermined position; positioning the upper part of the two stockings in the same predetermined position by accumulating it until a reference line of the stockings reaches a predetermined position, then by unthreading them over a predetermined length, identical for the two stockings; - 180 ° apart the shapes with the stockings partially cut longitudinally and sew the edges on two straight portions, one in continuation of the other: the sewing of a portion being simultaneous with that of the other portion. 2) Method according to claim 1, characterized in that said reference line for positioning the upper part of the stockings in the same predetermined position is the line of separation between the body and the lower leg. 3) Method according to claim 1, characterized in that said reference line for the positioning of the upper part of the stockings in the same predetermined position is a mark, that is to say a thread of appropriate color, predisposed in the stockings fabric. 4) Method according to claim 1, characterized in that said predetermined length of scrolling of the stockings relative to the shapes to reach the predetermined position for positioning the upper part of the stockings is variable as desired depending on the depth of the longitudinal cut to execute successively. 5) Method according to claim 1, characterized in that said seam of the edges of the stockings cut in two portions is continuous with a central zone having a double seam of variable length at discretion. 6) Method according to claim 1, characterized in that said seam of the edges of the stockings cut in two portions is discontinuous with a central seamless area of variable length at discretion. 7) Method according to claim 1, characterized in that said seam has the same length for both portions. 8) Method according to claim 1, characterized in that said simultaneous sewing of the two portions is carried out on the same pair or on a different pair of stockings. 9) Machine for the automatic sewing of two stockings for the formation of a pantyhose according to the method according to one or more of the preceding claims, and comprising carousel means (10) rotating horizontally intermittently with an identical stop in several treatment stations , with several pairs of flat shapes (1), twinned, juxtaposed horizontally and able to be separated to support in tension an upper portion of the stockings (2) threaded on by hand without positioning, characterized in that it comprises: - Means for the vertical alignment of the elastic edge (20) of the two bottoms (2) in the same predetermined position, with a carriage (3) with reciprocating horizontal movement in the longitudinal direction of the forms (1), which is provided two optical sensors (30) for detecting the elastic edge of the two stockings and with two jaws (31) with alternating vertical movement, by means of a corresponding pneumatic cylinder (32), and a fixed jaw (33) intermediate, for blocking the two elastic edges (20), separately, during their displacement along the forms (1); - Means for positioning the body (22) or the upper part of the two bottoms (2) in the same predetermined position with a first fixed optical sensor (40) for detecting the presence of at least one stocking (2) on the forms (1), with other fixed optical sensors (41) for detecting a reference line (23) provided on the stockings (2), and with two twin groups (4) for moving the stockings which act by friction along the external longitudinal edges of the shapes (1) in both directions: said groups (4) being controlled to engage or respectively individually abandon the corresponding form (1) and, moreover, to vary individually their own position between the plane of the corresponding form (1) and another plane parallel to the latter; - means for sewing the edges (25) aligned with the two stockings (2) cut with two automatic sewing machines (5,50) which are controlled to move on a track (51) parallel to the direction of sewing XX and to move towards and from said direction XX to allow the rectilinear sewing of a corresponding portion to be carried out (T1, T2). 10) Machine according to claim 9, characterized in that each of said twin groups (4) for moving the stockings (2) along the forms (1) is equipped with an endless belt (42), or a roller or similar, with a channel-shaped section for engaging a longitudinal edge (12) projecting laterally from the corresponding shape (1) with the interposition of a bottom (2), this group (4) being mounted on an arm (43) oscillating horizontally from and to the corresponding shape (1) and also with vertical translation from and to the plane of the corresponding shape (1). 11) Machine according to claim 9, characterized in that said optical sensors (41) are two in number, one placed above and the other placed below the shapes (1) and positioned in correspondence with the axis shapes (1). 12) Machine according to claim 9, characterized in that said sensors (41) consist of two pairs, one located above and the other located below the shapes (1) and in that each sensor is positioned in correspondence of the midline of an arm of the corresponding shape (1). 13) Machine according to claim 9, characterized in that said two automatic sewing machines (5,50) are provided in the same carousel processing station (10). 14) Machine according to claim 9, characterized in that said two automatic sewing machines (5.50) are provided in two consecutive processing stations of the carousel (10). 15) Machine according to claim 9, characterized in that the sewing machine (5) which performs the seam of the first portion T1 enters on the edge (25) to be sewn laterally, while the sewing machine (50) which performs the seam of the second portion T2 enters the edges (25) to be sewn head-on. 16) Machine according to claim 9, characterized in that the two automatic sewing machines (5,50) operate simultaneously. 17) Machine according to claim 9, characterized in that it comprises means for adjusting the length of the different portions T1, T2 of seam to allow the length of the central zone to be varied respectively with a double seam or without seam. 18) Machine according to claim 9, characterized in that said two automatic sewing machines (5,50) are interconnected so as to perform in tandem the sewing stroke and the empty return stroke. 19) Machine according to claim 9, characterized in that said automatic sewing machines (5,50) are independent with respect to each other in the movements towards and from the seam line XX. 20) Machine according to claim 9, characterized in that it comprises cutting means (6) of the tail (60) of the portion T1 of sewing.

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