PROCESS TO CLOSE AN END OF A TUBULAR MANUFACTURED ARTICLE DIRECTLY ON HOSIERY AND KNITWEAR CIRCULAR MACHINES AND RESPECTIVE CIRCULAR MACHINE

Abstract

A process to close an end of a tubular manufactured article directly on hosiery and knitwear circular machines, a respective circular machine and a respective device are described. The process provides that a respective stitch is collected from each needle of at least one first half of adjacent needles of the machine cylinder; the stitches are arranged on corresponding needles of a second half of adjacent cylinder needles, so that each of the needles of the second half of the needles carries a pair of stitches of the last course, which are arranged, at first, on opposite cylinder needles with reference to a diameter of the cylinder; at least one yarn is fed to the cylinder needles; and the pairs of stitches are joined together and the end of the tubular manufactured article is closed, by processing the yarn with the needles of the second half of the cylinder needles.

Claims

1. A process for closing an end of a tubular manufactured article (8) comprising a plurality of consecutive courses, each in turn comprising a plurality of stitches, produced by means of a circular machine (1) comprising at least one cylinder (4) housing a plurality of vertically arranged needles (5), which are placed side by side to form a first semicircle (SC1) and a second semicircle (SC2), each comprising the same number of needles, a head (3) and one or more feeding stations (6) to feed at least one yarn (7) to said needles, wherein said needles are susceptible to operational upward and downward movements to form a plurality of stitches of said at least one yarn (7), the tubular manufactured article during its production being kept inside said at least one cylinder (4), wherein, after the steps required to produce the tubular manufactured article up to a last course (8′), the method comprises the steps of: a) individually collecting from each needle of the cylinder needles (5) the respective stitch (8″) of the last course (8′) of the manufactured article; b) coupling two-by-two the stitches of the last course that were collected at point a) and positioning each pair of stitches on a half of the cylinder needles, so that each of the needles of said half of the needles carries a pair of stitches of the last course, which are arranged, at first, on opposite cylinder needles with reference to a diameter (D) of the cylinder; c) feeding the at least one yarn (7) to the cylinder needles; d) joining together said pairs of stitches to close the end of the tubular manufactured article (8), by processing said at least one yarn with the needles of said second half of the cylinder needles.

2. The process according to claim 1, wherein in step d) the step of joining together said pairs of stitches involves the knitting, sewing or linking of the stitches together, by processing said at least one yarn (7) by means of part of the same cylinder needles that contributed to the formation of the tubular manufactured article, without using any specific needle or any linking or sewing device outside the circular machine, or otherwise combined therewith.

3. The process according to claim 1, wherein in step d) the rotating cylinder is rotated in reciprocating motion to make at least two partial semi-rotations in opposite directions of the cylinder, wherein in the first semi-rotation first groups (G1) of at least one needle of the needles of said second half of the needles are brought to an unloading position, in which the stitches they support are brought to a position adapted to be unloaded, while second groups (G2) of at least one needle of said second half of the needles are brought to a position in which the stitches they support are restrained, and in the second semi-rotation said second groups (G2) of at least one needle are brought to said position in which the stitches they support are brought to an unloading position, while said first groups (G1) of at least one needle are brought to said position in which the stitches they support are restrained.

4. The process according to claim 3, wherein during step b) the needles of said second half of the needles are kept in a restrained position (B) and wherein during step d) the rotating cylinder is rotated in reciprocating motion to make at least two partial semi-rotations in opposite directions of the cylinder, wherein in the first semi-rotation first groups (G1) of at least one needle of the needles of said second half of the needles are brought to a raised position (A) in which they intercept said yarn (7), while second groups (G2) of at least one needle of said second half of the needles are brought to said restrained position (B) in which they restrain the respective stitches and intercept the yarn (7) and in the second semi-rotation said second groups (G2) of at least one needle are brought to the raised position (A) in which they intercept said yarn (7), while said first groups (G1) of at least one needle are brought to the restrained position (B) in which they restrain the respective stitches and intercept the yarn (7), and wherein at the end of step d) at least one semi-rotation, in which all the cylinder needles are brought to the raised position (A), is provided.

5. The process according to claim 1, wherein before step a) it is provided to move the head (3) and said one or more feeding stations (6) away from the cylinder in order to clear a space above the cylinder, adapted to accommodate the positioning device.

6. The process according to claim 1, wherein the step a′) of extracting the tubular manufactured article from the cylinder and turning it inside out so that its outer part is inside, and vice versa, is provided between step a) and step b) and before step d).

7. (canceled)

8. The process according to claim 1, wherein the stitches of the last course are collected by means of a positioning device (12) which comprises a supporting element (14) having a plurality of transferring members (15), said positioning device being movable between a resting position, in which it is shifted sideways with respect to the at least one machine cylinder, and a working position, in which it is at the machine cylinder, wherein said supporting element comprises at least one movable portion (14″) carrying a plurality of said transferring members, each corresponding to a respective needle of a half of the cylinder needles belonging to said first semicircle (SC1), wherein said movable portion is susceptible of rotation to be moved from an initial position in which each transferring member is at a respective needle of a half of the cylinder needles belonging to said first semicircle (SC1), to a position rotated by 180°, in which each transferring member is close to or at a respective needle of a half of the cylinder needles belonging to said second semicircle (SC2), wherein said transferring members are arranged in the same direction as the needles, each above a respective needle, so that the free end (16) of each of said transferring members can contact the upper part of a respective machine needle and collect the stitch that is thereon, or wherein said transferring members are arranged perpendicularly to the needles and are moved radially with respect to the cylinder, in order to collect the stitch from a respective needle.

9. The process according to claim 8, wherein the supporting element comprises a fixed portion (14′) carrying a plurality of said transferring members, each corresponding to a respective needle of a half of the cylinder needles belonging to said second semicircle (SC2), wherein in step b) the movable portion is brought to the rotated position, so that each of its transferring members is close to or at a respective transferring member of said fixed portion and wherein step b) comprises the steps of b′) moving the stitches that are on each transferring member of the movable portion to the corresponding transferring member of the fixed portion, of b″) returning the movable portion, now without stitches, to its initial position, and of b″) moving the pairs of stitches from the transferring members of the fixed portion to said second half of the cylinder needles.

10. The process according to claim 1, wherein after a pair of stitches of the last course have been arranged on each of the needles of said second half of the cylinder needles, and before the steps required to close the end of the tubular manufactured article (8), the tubular manufactured article is positioned in the cylinder (4).

11. A circular machine (1) for producing tubular manufactured articles (8) comprising a plurality of consecutive courses, each in turn comprising a plurality of stitches, wherein the circular machine comprises a head (3), at least one cylinder (4) housing a plurality of vertically arranged needles (5) arranged side by side to form a first and a second semicircles (SC1, SC2), which comprise the same number of needles, and one or more feeding stations (6) to feed at least one yarn (7) to said needles, wherein said needles are susceptible of operational upward and downward movements to form a plurality of stitches of said at least one yarn (7), said tubular manufactured article (8) during its production being kept inside said at least one cylinder (4), said circular machine being characterized in that it comprises a positioning device (9) comprising a transferring apparatus (12) having a plurality of transferring members (15), wherein the numbers of said transferring members (15) is equal to the number of cylinder needles for a) individually collecting from each needle (5) of the cylinder needles the respective stitch of the last course (8′) of the tubular manufactured article, and b) coupling two-by-two the stitches of the last course that have been collected at point a) and position each pair of stitches on a half of the cylinder needles so that on each of the needles of said half of the cylinder needles there are two stitches to be joined by means of said half of the cylinder needles and in that said positioning device is movable between a resting position, in which it is shifted sideways with respect to the at least one machine cylinder, and a working position in which it is at the machine cylinder, vertically aligned therewith, said machine not comprising or not being combined with any sewing or linking device.

12. The circular machine (1) according to claim 11, wherein the head (3) and the at least one feeding station (6) of the yarn are combined with the circular machine by means of movement means (21) in order to be moved: from an active position, in which they are located at the cylinder, in order to contribute to the formation of the tubular manufactured article (8), to an idle position, in which they are away from the at least one cylinder, in order to allow the positioning device (9) to be brought into the working position, and back to the active position, in order to contribute to close an end of the tubular manufactured article by means of the needles (5) of said cylinder (4).

13. The circular machine (1) according to claim 11, wherein said movement means (21) comprise a fixed element (22) and a supporting element (23) carrying the head (3) and the at least one yarn feeding station (6) and wherein the supporting element is combined with the fixed element so that, with respect to the position in which it is located when the head (3) and the at least one yarn feeding station (6) are in said active position, it can be rotated sideways or upwards by an angle adapted to allow the positioning device to be arranged in the working position in order to couple together the stitches of the last course and, if necessary, to turn the tubular manufactured article inside out, said angle being between 45° and 90°, preferably between 60° and 90°.

14. (canceled)

15. The circular machine (1) according to claim 11 wherein the transferring apparatus (12) comprises a supporting element (14) having at least one movable portion (14″), carrying a plurality of transferring members (15) whose number is equal to at least half of the cylinder needles, wherein said movable portion can be moved between an initial position, in which the transferring members are at the first half of the cylinder needles, belonging to said first or second semicircle, and a position rotated by 180° with respect to said initial position and wherein said transferring members are arranged in the same direction as the needles, each above a respective needle, so that their free end (16) can contact the upper part of a respective machine needle and collect the stitch thereon, or wherein said transferring members are arranged perpendicularly to the needles and are moved radially with respect to the cylinder, in order to collect the stitch from a respective needle.

16. The circular machine (1) according to claim 15, wherein the supporting element (14) also comprises a fixed portion (14′) carrying the same number of transferring members as the movable portion, wherein the movable portion can be moved between an initial position, in which it is aligned and coplanar with the fixed portion, and a position rotated by 180° with respect to the initial position, in which each of its transferring members (15) is close to or in contact with a respective transferring member of the fixed portion.

17. The circular machine (1) according to claim 11, further comprising a turner (13) integrated with said transferring apparatus (12) and integrally moving therewith with respect to the cylinder, configured to extract the tubular manufactured article from the cylinder and at the same time turning it inside out while keeping it above the cylinder (4) so that it is arranged above the transferring apparatus, with the stitches of the last course (8′) arranged on the transferring members (15) of the transferring apparatus and with its inner surface facing outwards, before the stitches of said first and second halves of the needles are joined together, and configured to position the tubular manufactured article inside the cylinder (4), after said pairs of stitches have been positioned on said first or second half of the cylinder needles, but before the stitches of the last course are joined together, by means of said first or second half of the cylinder needles, said turner (13) being able to comprise at least one tubular element (19) having suction means combined therewith.

18. A positioning device (9), to be arranged at a cylinder (4) of a circular machine for the production of tubular manufactured articles (8), which comprise a plurality of stitches, said cylinder housing a plurality of vertically arranged needles (5), arranged side by side to form a first and a second semicircles (SC1, SC2), the positioning device comprising a transferring apparatus (12), wherein the transferring apparatus comprises a plurality of transferring members (15) for: a) collecting from at least one first half of the cylinder needles, belonging to said first or second semicircle, the respective stitches of the tubular manufactured article, and b) positioning the stitches of a half of the last course that have been collected at point a) on a second half of the cylinder needles belonging to said second or first semicircle, so that there are two stitches on each of the needles of said second half of the cylinder needles belonging to said second or first semicircle.

19. The positioning device (9) according to claim 18, further comprising a turner (13) integrated with said transferring apparatus (12), wherein the turner (13) is equipped with turning elements comprising a tubular element (19) having suction means (20) combined therewith for extracting the tubular manufactured article from the cylinder and turning the tubular manufactured article inside out, directly above the machine cylinder (4), before the stitches collected at point a) are positioned on the second half of the cylinder needles belonging to said second or first semicircle and for positioning the tubular manufactured article inside the cylinder (4) of the circular machine, after said pairs of stitches have been positioned on said first or second half of the cylinder needles.

20. The positioning device (9) according to claim 18, wherein the transferring apparatus (12) comprises a supporting element (14) having at least one movable portion (14″) carrying a plurality of transferring members (15) whose number is equal to at least half of the cylinder needles, wherein said movable portion can be moved between an initial position, in which the transferring members are at the first half of the cylinder needles, belonging to said first semicircle, and a position rotated by 180° with respect to said initial position.

21. The positioning device (9) according to claim 20, wherein the supporting element (14) further comprises a fixed portion (14′) carrying the same number of transferring members as the movable portion, wherein the movable portion can be moved between an initial position, in which the movable portion is aligned and coplanar with the fixed portion, and a position rotated by 180° with respect to the initial position, in which each of the transferring members (15) is close to or in contact with a respective transferring member of the fixed portion.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0044] However, the invention will be better illustrated in the following description with reference to the attached indicative and non-limiting drawings, in which:

[0045] FIG. 1 shows a front view of a circular hosiery or knitwear machine provided with a positioning device according to the present invention, in a normal condition of use, at the end of the production of a tubular manufactured article;

[0046] FIG. 2 shows the machine of FIG. 1 in a second condition of use;

[0047] FIG. 3 shows the machine of FIG. 2 with the positioning device in a working position;

[0048] FIGS. 4, 5 and 6 show an enlarged view of the machine portion in the frame of FIG. 3, with the positioning device in three different steps of collecting the stitches of an end of the tubular manufactured article and turning the manufactured article itself inside out;

[0049] FIGS. 7, 8 and 9 show three subsequent steps needed to couple together the previously collected stitches;

[0050] FIGS. 10 and 11 show the steps required to transfer pairs of stitches to a half of the cylinder needles;

[0051] FIG. 12 shows a view of the machine, similar to that in FIG. 1, but with the last stitches of the tubular manufactured article arranged on a half of the cylinder needles;

[0052] FIG. 13 shows a schematic view of the cylinder completed with needles;

[0053] FIG. 14 shows part of the machine needles during a working step for closing the end of the manufactured article; and

[0054] FIG. 15 shows two machine needles in two different positions, which are taken while closing the end of the manufactured article.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0055] In said drawings, the numeral 1 generically denotes a circular machine for hosiery or knitwear. The machine may be of the type adapted for producing socks or stockings. The figures illustrate, by way of example, a machine of the type with only one cylinder, also called single cylinder machine, but the machine could also be of the double-cylinder type.

[0056] This circular machine 1 comprises a base 2, a head 3, at least one main or lower cylinder 4 combined with the base and susceptible of at least partial rotations, defined as travels, in which a plurality of vertically arranged needles 5 are slidably mounted side by side to form a circle, the latter comprising a first semicircle SC1 and a second semicircle SC2 both having the same number of needles, as shown in FIG. 13. The machine may also comprise an upper cylinder—not shown—combined with the head and mounted above the cylinder 4 and aligned therewith, so that the needles 5 may slide into either of these cylinders in order to make plain or purl stitches. Each cylinder can be selectively operated to rotate with continuous or reciprocating motion, depending on the production steps. For simplicity, the following description will refer to a single-cylinder machine, i.e. a machine equipped with only one cylinder, without excluding that what is described below may also be applicable to a double-cylinder machine, i.e. equipped with an upper cylinder too.

[0057] One or more feeding stations 6 are combined with the head, for feeding the needles with at least one yarn 7 to be processed, for the production of a tubular manufactured article 8 that consists of a sequence of stitches of at least said yarn, which form a plurality of consecutive courses. The term “course” refers to stitches made in one travel, i.e. one full or partial turn of the cylinder. For producing stitches, usually the needles may comprise a portion referred to as a hook 5′ to catch and restrain the yarn to be processed, and a latch 5″ to close the hook during stitch formation. Each needle can be selectively brought to:

[0058] a lowered position, in which the hook does not intercept the yarn but unloads the stitch produced in the previous travel,

[0059] a raised position A, in which the hook intercepts the yarn and, as shown in FIG. 15, brings the stitch made in the previous travel below the latch in order to be able to unload it when the needle is brought to the lowered position, or

[0060] an intermediate position defined restrained position B in which, as shown in FIG. 15, the hook restrains above the latch the stitch made in the previous travel and possibly intercepts the yarn.

[0061] Specifically, the tubular manufactured article may be a sock and is made starting from an edge portion thereof, followed by a leg portion, if any, to be worn on at least part of a user's leg, then by a foot portion, and ending with a toe portion to be worn on the user's toes. At the end of the production of the manufactured article, on the cylinder needles there are the stitches 8″ which form the last course 8′ of the manufactured article, i.e. the knit turn which forms the terminal end of the manufactured article. The sock remains in the machine cylinder 4 during its production, suctioned downwards by suction means normally provided on the machines of the present invention. Thanks to this, no changes are made to the machine other than those strictly necessary to close its toe.

[0062] According to the invention, a positioning device 9 is combined with the machine. Preferably, the positioning device is fixed to the base by means of a support 10 having an arm 11 rotatable about the support itself, in order to move the positioning device between a resting position in which it is shifted sideways with respect to the at least one machine cylinder, as shown in FIGS. 1, 2 and 12, and a working position shown in FIGS. 3-11, in which it is at the machine cylinder and aligned therewith.

[0063] The positioning device 9 comprises a transferring apparatus 12 adapted for collecting from at least one half of consecutive needles of the cylinder needles 5, i.e. from at least one first semicircle SC1, the respective stitches of at least one first half of the last course 8′ and for positioning the collected stitches on the other half of the needles of the rotating cylinder, i.e. on the other semicircle SC2, or vice versa, so that each of these needles no longer supports a single stitch but a pair of stitches one of which belonging to the first half of the last course and the other one belonging to a second half of the last course.

[0064] In other words, the stitches arranged, at first, on the needles belonging to the first semicircle SC1 and forming the first half of the last course are arranged on the needles belonging to the second semicircle SC2, together with the stitches originally supported by the needles of this second semicircle and forming the second half of the last course, so that two stitches 8″, initially in positions opposite each other with reference to a diameter D that partitions the two semicircles, result to be on the same needle belonging to the second semicircle, as shown in FIG. 15. This operation is often referred to as “stitch overturning” and allows the first and second halves of the last course, i.e. the two knit semicircles that make up one end of the tubular manufactured article, to be brought close to each other.

[0065] Once the stitches have been collected from the first half of the cylinder needles, these needles can be brought to the lowered position so as not to interfere with subsequent working steps.

[0066] Preferably, the transferring apparatus is designed to collect respective stitches of the last course 8′ from all the cylinder needles, then couple two by two said stitches and finally position each pair of stitches on the needles belonging to the first or second semicircle.

[0067] In addition, the positioning device may comprise a turner 13 configured to operate directly above the machine cylinder 5 and comprising, for example, a pneumatic suction tube which overturns the tubular manufactured article once it has been formed, so as to turn it inside out after being collected from the cylinder needles but before having coupled the opposite stitches together, and to reposition the tubular manufactured article within the lower cylinder, after having coupled the opposite stitches together and before closing the end.

[0068] The transferring apparatuses and the turners are known per se but in the present case, in particular, the transferring apparatus is configured to reposition the collected stitches onto the machine needles, whereas the turner is structured to remove the sock from the machine cylinder and to turn it inside out, while remaining above the cylinder itself. Specifically, the transfer apparatus 12 may comprise a supporting element 14 preferably having annular shape and carrying a plurality of transferring members 15 for collecting all the stitches present on the machine needles. Even more preferably, the supporting element 14 carries a plurality of transferring members 15, whose number is equal to the machine needles, each of which is intended to collect the stitch that is on a respective machine needle. The transferring members may be arranged in the same direction as the needles, each above a respective needle as shown in the figures, so that the free end 16 of each of them may contact the upper part of a respective machine needle and collect the stitch located thereon. Alternatively, the transferring members may be arranged perpendicular to the needles and may be radially moved with respect to the cylinder in order to collect the stitch from a respective needle.

[0069] The supporting element 14 comprises a fixed portion 14′ and a movable portion 14″, each carrying the same number of transferring members. The fixed portion and the movable portion are combined with each other by means of a joint 17, which allows said movable portion to be moved between an initial position, in which it is aligned and coplanar with the fixed portion, as shown for example in FIGS. 1-7, and a position rotated by 180° with respect to the initial position, so that each transferring member 15 of said movable portion is close to or in contact with a respective transferring member of the fixed portion, as shown in FIG. 9.

[0070] The transferring apparatus also includes means—not shown—for moving the stitches from the cylinder needles to the transferring members, possibly from the transferring members of the movable portion to the transferring members of the fixed portion and from the transferring members to the cylinder needles. The stitch moving means may comprise pusher elements—not shown—housed in the transferring device, in addition to a tube normally housed in the machine cylinder for housing the tubular manufactured article during its formation.

[0071] The turner 13 is combined with an upper portion of the transferring apparatus 12 and comprises a containing body 18 in which a tubular element 19, having suction means 20 combined therewith, is slidingly mounted. When the positioning device is arranged above the lower cylinder with the transferring members in contact with the needles, the tubular element is moved downward so that a portion thereof is located inside the tubular manufactured article. When suctioning by the suction means, an end portion of the tubular manufactured article is kept close to the tubular element so that, by moving the tubular element upwards, the tubular manufactured article is pulled upwards; since an end thereof, constituted by the last course, is locked on the cylinder needles, the tubular manufactured article is turned inside out and arranged in the containing body, as shown in FIGS. 5-10. Advantageously, by integrating the transferring apparatus and the turner with each other, all the operations required to lead the tubular manufactured article to the suitable condition for closing one of its ends, directly at the cylinder of the machine, can be carried out. On the contrary, a device according to known art which provides two separate elements, of which only the transferring apparatus is designed to work at the machine cylinder while the turner is a separate element combined with the machine in a lateral position away from the cylinder, not only would not allow all the operations required for the correct positioning of the manufactured article to be carried out, but would require the manufactured article to be undesirably moved outside the machine and then back at the cylinder, thus involving additional times and potentially causing breakages.

[0072] In order for the positioning device to be arranged in the working position, where it is at the machine cylinder, the machine head 3 and the feeding stations 6 are combined with the machine itself so that they can be shifted between an active position, in which they are near the cylinder and contribute to the formation of the tubular manufactured article, as shown in FIGS. 1 and 12, and an idle position in which they are away from the cylinder, to completely clear the space above the latter, as shown in FIGS. 2 and 3.

[0073] For this purpose, the head 3 and the feeding stations 6 are carried by movement means 21 preferably of motorized type, which comprise a fixed element 22 and a supporting element 23 susceptible to be moved with respect to the fixed element. Specifically, the supporting element may be rotated upwards or sideways with respect to the active position by an angle suitable to clear a space above the cylinder sufficient to receive the positioning device, without interfering with the head and/or yarn feeding stations. Preferably the angle is at least 45° but more preferably it is about 90°, to completely clear the space above the cylinder.

[0074] Once the transfer of the pairs of stitches to a half of the cylinder needles has been completed and the tubular manufactured article has been turned inside out, if necessary, and positioned in the cylinder by the positioning device, the positioning device is returned to its resting position and the movement means return the head and the yarn feeding stations from the idle position to the active position, so that they can contribute to close the end of the tubular manufactured article.

[0075] In fact, after pairs of stitches of the last course of the tubular manufactured article have been positioned on a half of the cylinder needles, after the tubular manufactured article has been repositioned in the cylinder 4 and after the head and the yarn feeding stations have been returned to their active position, at least one yarn 7 is again fed to these needles so as to join the stitches by knitting them together directly by this yarn fed to said needles. In order to carry out this operation, the cylinder is rotated in reciprocating motion in order to carry out at least two semi-rotations in opposite directions and the needles are brought to different positions in order to produce the stitches needed to knit together the stitches 8″ of the two halves of the last course 8′. This allows the two half-courses of the end of the tubular manufactured article, and in particular of a sock, to be joined directly in the machine and by using the same cylinder needles used to produce the manufactured article, without the need to use specific needles for this operation and without the need to take the manufactured article away from the cylinder to close its end by means of external devices, such as linking or sewing heads. Therefore, the proposed solution allows the circular machine to be greatly simplified and the costs to be significantly reduced, compared to the solutions currently available on the market.

[0076] In a preferred embodiment, during the step of transferring the stitches on half of the cylinder needles, these needles are kept in the restrained position B, so that said stitches remain above the latch 5″ of the respective needle. During a first semi-rotation, the needles are alternately selected so that at least one needle brought to the raised position A, at the feeding station 6 of the yarn 7, is followed by at least one needle brought to the restrained position B, at the feeding station 6 of the yarn 7, and so on. Conversely, in the second semi-rotation the needles that in the previous semi-rotation intercepted the yarn in the raised position are brought to the restrained position and the needles that previously intercepted the yarn in the restrained portion are brought to the raised position.

[0077] The needles may be controlled with any type of selection 1:1, 2:2, 2:1 and so on, provided that first needle groups G1 alternate with second needle groups G2, wherein said first and second groups comprise at least one needle. Preferably, the selection is of the 1:1 type in which a needle in raised position A is followed by a needle in restrained position B and so on. Thus, each needle in raised position intercepts the main yarn and unloads the pair of stitches it supports, while each needle in restrained position intercepts the main yarn and restrains the two stitches it supports. Since the positions of the needles are reversed in the two semi-rotations, in the next semi-rotation the needles which previously restrained the stitches now unload them, while the others ones restrain the stitch formed in the previous semi-rotation. Preferably at least two pairs, and particularly preferably three pairs, of semi-rotations such as those described above are carried out, without however excluding that an odd number of semi-rotations may be carried out.

[0078] In order to be able to unload all stitches from the cylinder needles, at least one additional semi-rotation can be carried out in which all needles of the working half of the needles are brought to the raised position.

[0079] Therefore, the method according to the invention provides that the end of a tubular manufactured article, and in particular the toe of a sock, is closed directly on the circular machine, without the aid of any linking or sewing device to be combined with the machine. Such closure is achievable by simply positioning pairs of stitches of the last course on a half of the cylinder needles, each pair comprising a stitch initially carried by a needle belonging to one half of the cylinder needles and a stitch initially carried by an opposite needle of the other half of the cylinder needles, with reference to a diameter D of the cylinder, and by joining these stitches by processing at least one yarn with the cylinder needles that carry pairs of stitches. Therefore and advantageously, the end of the manufactured article and specifically the toe if it is a sock, is closed or joined by means of a part of the cylinder needles, which contributed to the formation of the remaining part of the manufactured article. This avoids the need to move away the manufactured article from the machine cylinder during its closing and the need to have specific needles, in addition to those of the machine, to carry out this operation, as well as the need for specific linking or sewing devices external to the machine or in any case combined therewith, but outside the normal working area of the machine. By sewing, stitching or linking the end of the tubular manufactured article directly by means of the same cylinder needles at the end of the production of the manufactured article, the machine, compared to a machine with an external sewing device, can be simplified, thus reducing costs and improving its reliability as it does not have any specific needle, intended for sewing, which, as well as the members supporting the stitches during sewing, is particularly subject to wear due to the rubbing with the needle, when the latter comes into contact with them. According to the method, the sock is produced in traditional manner and remains arranged in the lower cylinder during its formation, as usual.

[0080] Preferably, the stitches of the needles of the first semicircle SC1 are placed on the needles of the second semicircle SC2 but this does not excludes that pairs of stitches originally supported by opposite cylinder needles are combined with each other and then rotated by a desired angle before each being arranged on a needle of a half of adjacent cylinder needles.

[0081] During the step of positioning stitches on half of the cylinder needles, the needles of this half of the cylinder needles may be kept in their restrained position. This advantageously allows the stitches to be collected so that they remain above the latch 5″ of the needle 5, so as to be able to subsequently choose what type of stitches are to be produced, in order to join the stitches of the last course together.

[0082] To carry out the joining of the end of the manufactured article, the cylinder is rotated to perform at least two rotations. Preferably, the cylinder is rotated in reciprocating motion to perform at least two semi-rotations in opposite directions in which, at the yarn feeding station, needles brought to the raised position are alternated with needles kept or brought to the restrained position, so that the needles that intercepted the yarn in the raised position during the first semi-rotation intercept the yarn in the restrained position during the second semi-rotation and, conversely, the needles that intercepted the yarn in the restrained position during the first semi-rotation intercept the yarn in the raised position during the second semi-rotation.

[0083] At the end of the step of joining the stitches of its end, the manufactured article is unloaded from the machine as usual, passing through the cylinder, but its end is already closed and not open as normally happens. Therefore, this method allows the manufactured article to be made in the traditional way, starting from an end thereof, i.e. the edge in the case of a sock, which is intended to remain open, and ending with the opposite end which is closed directly by the machine needles, at the end of the production of the manufactured article.

[0084] Before the steps of coupling the opposite stitches together and arranging the pairs of stitches on part of the cylinder needles, the tubular manufactured article may be turned inside out and then, after the aforesaid steps, it may be arranged again in the cylinder but remaining inside out.

[0085] To allow the positioning device to be arranged above the cylinder during the collecting and positioning steps, the head and the yarn feeding stations are moved to an idle position by being overturned or shifted sideways.

[0086] Half of the stitches of the last course are collected by means of the transferring members of the movable portion and the other half are collected, if necessary, by means of the transferring members of the fixed portion. In this case, the stitches are coupled together by overturning the movable portion onto the fixed portion and pushing or pulling the stitches present on the movable portion so that they pass onto the fixed portion.

[0087] Finally, the stitches thus coupled are moved from the fixed portion, after the movable portion has been moved away, to half of the cylinder needles by suitable means. In the event that only one half of the stitches are collected, at the end of the collection the movable portion is overturned directly onto the needles of the second half of the cylinder and the stitches it supports are brought onto these needles.

[0088] At this point, the head and yarn feeding stations are returned to the active position so as to contribute to close the end of the manufactured article, simply by processing the yarn through half of the cylinder needles on which the stitches are arranged.

[0089] The invention is based, therefore, on this concept: collecting at least half of the stitches of the last course of the tubular manufactured article, which are arranged on adjacent needles of the cylinder, then moving these stitches so that on another half of the needles of the cylinder there are pairs of stitches originally arranged on opposite cylinder needles, with reference to its diameter, and joining the stitches by processing a yarn fed to the needles of said other half of the needles, so that the end of the tubular manufactured article is closed directly by the same needles which contributed to the formation of the manufactured article and without the aid of needles or additional sewing or linking devices. Therefore, in order to meet incidental and specific requirements, several variations and modifications could be made by a field technician to the illustrated and described embodiments of present invention, provided that all are included in the protection scope of the invention as defined by the following claims.