MXPA99001673A - Method and apparatus for sewing edges of pu fabric articles - Google Patents

Abstract

An operative method for sewing the edges of a tubular knitting article (C) comprising the preliminary steps of knitting the article in a knitting station (T), removing the stitches from the last row of knitted fabric is described. With stitch removal means mounted on a first mobile unit between the station T and a latching station (R), reverse the first semi-row of stitches around an axis that virtually subdivides the last row of knitted fabric into the first and second semi-rows to place the stitches inverted in that manner in correspondence with the stitches of the other half-row, engaging the stitches, assem- bled from the first and second half-rows, characterized in that it comprises, after the step of removing the stitches of the last one. knit row, the transfer of the fabric stitches of at least one semi-row over other means than those that operate the hile above, the transfer means holding the stitches of at least one half-row during the investment stage. (Fig

Description

METHOD AND APPARATUS FOR SEWING EDGED ITEMS OF ITEMS SPECIFICATION The present specification relates to a method and apparatus for sewing edges of knitted articles, especially tubular articles such as stockings. It is known how to produce the stockings by means of circular machines of a cylinder or two cylinders which can use a single or double fabric front or stitch forming needles, the knitting on said machines starting from the edge side. or hem to the upper end where the toe end side remains open and ^ cpn the stitches of the last row fit over the respective forming needles. In order to close the toe of the tubular operating methods thus produced are known, described in EP 635593, EP 592376 and WO 97/20089, according to which each article is driven in such a way that it is placed, the homologetic stitches of two semi-rows, within which the last row of knitted fabric can be virtually subdivided, in a corresponding relationship that allows sewing, or hooking of the same afterwards by means of the devices provided either in the weaving station knitted, ie in correspondence with the knitting machine of the machine, or in the knitting or separate knitting station. However, machines operating in accordance with the operational techniques with which they are present may exhibit disadvantages consisting mainly of their mechanical and structural complexity and the impossibility of practically treating articles characterized by "a very high fineness. , manual processes are known to close the toes of tubular articles such as stockings, according to which the stocking is manually fed to a sewing machine or hook that provides the union of two confronting edges of the tip portion of the articles It should be noted in this regard that manual sewing and hooking involve excessive times and costs with respect to manufacturing requirements at 1 st.

The main object of the present invention is to overcome these disadvantages. This result has been achieved, according to the invention, by providing a method and apparatus having the characteristics indicated in the section on the characterization of the indications 1 and 9. The additional features are set forth in the claims. dependents The advantages deriving from the present invention lie essentially in that it is possible to sew automatically the outer edges of the article, for example, the closing of the toe of a stocking, as in two-cylinder machines as in two. cylinders, removing from them the needles of any type and shape, both the inner side and the outer side of the article, reducing from this sidewalk to a minimum the steps of the members provided for the knitting of the articles has this stage of join the edges of interest, and increase the production capacity of each work station. An additional advantage derives from the imp lication of the mechanical structure and the interaction between the members provided for the handling of the stitches, with respect to the machines known today. _ These and other Advantages and features of the invention will be better understood by one skilled in the art upon reading the following description in conjunction with the accompanying drawings given as a practical example of the invention, but not are considered in a limiting sense, wherein: FIGS. 1-15, which will be described in greater detail below, relate to a first example of imp1 ement of the operating method according to the invention, FIGS. refer to 'an additional example of implementation of the method of operation according to the operation; Figures 30-45 which will also be described in more detail below refer to a third example of the implementation of the operative method according to the invention; Figure 46 is a plan view of the first moving unit of the support and movement of the stitch removal means; Figure 47 is an elongated sectional view taken on line H-H of Figure 46; Figure 48 is a plan view of the second mobile unit for supporting the reversal means of the stitches of the first half-row, and the hooking means, according to a viable embodiment, the unit shown in FIG. open condition for the placement of the same on the knitting head of the knitting machine; Figure 49 shows the mobile unit of Figure 48 in closed condition; Figure 50 is an elongated sectional view taken on line K-K of Figure 49; Figure 51 shows the mobile unit of Figure 49 with the semi-cylindrical, important for the reversal means of the stitches of the first half-row that is inverted 180 ° around the axis M-M; Figure 52 is an elongated sectional view taken on line L - * L of Figure 51; Figure 53 is a plan view of two mobile units of Figures 46 and 49 that are placed in coaxial coaxial; Figure 54 is a side view of the movable units that are positioned as shown in Figure 53; Figure 55 shows three Tas, two previous mobile units, with the first unit in operative position on the machine's weaving head - and with the second unit outside the textile machine, in a condition in which the respective semicorona, which are mounted as fastening jaws, are - open - to be placed in correspondence with the knitting head without interfering with the article and the suction tube present therein; __ 1 to Figure 56 is a view similar to Figure 55, with the semi-cords of the second mobile unit in closed condition to form a complete circular crown; Figure 57 shows the first mobile unit, that is, the unit that supports the stitch removal means according to an additional modality, with two complementary semi-coffins capable of moving vertically one in relation to the other in the condition of. coupling; Figure 58 shows the means of Figure 57, with the two semicorns in separate condition; Figure 59 is an ista, in plan, of the details relating to Figures 57 and 58; Figure 60 is a sectional view taken on the line W-W of Figure 59 in the condition illustrated in Figure 57; Figure 61 is a section taken on the line W-W of Figure 59 in the condition illustrated in Figure 58, Figure 62 shows the second mobile unit according to an additional embodiment; Figure 63 shows the means of Figure 62 with the respective semicorns in a separate condition; Figure 64 is a bottom view of the details relating to Figures 62 and 63; Figure 65 shows a sectional view taken on the U-U line of Figure 54, with the semi-cords engaged as shown in Figure 62; Figure 66 is a sectional view taken on the U-U line of Figure 64, with the semicircles separated as in Figure 63; Figure 67 is a plan view of a third mobile unit capable of being associated with the units of Figures 59 and 64; Figure 68 is a sectional view taken d_a on the line E-E of Figure 67; Figure 69 shows the mobile unit, with the respective half-bell rotated 180 ° about the axis p-n; Figure 70 is a sectional view taken on the line E-E of Figure 69; Figure 71 is an "X" view of the mobile unit of Figure 69, showing the relevant rotary actuator and a partial section of the pivot-of-1 to relevant crown and the corresponding support block of Figure 72 is a view in plant of the three mobile units on the common support column; Figure 73 is a side view of the units of Figure 72, with the semicorns of each unit in a separate condition; Figures 74A and 74B show a removal member (70) and a traction member (84) in separate condition respectively in side view and front view; Figures 75A and 75B show the members of Figures 74A and 74B respectively, in engagement with each other, ie, in a stitch changing condition; Figures 76A and 76B show a traverse means (84) and a tip (80) in a separate condition, respectively in side view and front view; Figures 77A and 77B show the members of Figure 76A and 76B in engagement with each other, ie, in a stitch changing condition; Figures 78A and 78B show schematically in front view and in side view respectively, the coupling between a removal member (70) acting as a working member, and a hooking tip (80). By reducing its basic structure, a method according to the invention, applied to the manufacture of tubular articles such averages, comprises the preliminary knitting of the article in a circular knitting machine of a cylinder or two cylinders, starting from the side of the edge or hem and ending with the formation of the portion corresponding to the toe in the "open condition, ie, with the stitches of the last row adjusted over the respective knitting or forming needles at the end at the end of the preliminary stage.

Subsequently, to knitting the articles, the following steps are provided: a) placing, in correspondence of the knitting head of the machine, first means capable of removing and maintaining the stitches of the last row of knitted fabric; b) transfer the article, with the tips * of the last row removed and held from the first means, outside the knitting head of the machine used to knit the article; c) transferring the stitches of the first half row onto the second means for rotating the stitches of the first half row around an axis (mm) with respect to which the first half row of stitches is in a first and second row semi-rows; ., _. d) transferring the stitches of the second half-row onto third means intended to hold the stitches of the first and second half-rows in a subsequent step for the engagement of 1 to them; e) rotating 18D ° _ the stitches of the first half row around the axis (m-m) so that, at the end of this stage, each stitch of the first half row will be placed coaxially with respect to the corresponding stitch of the second half row; f) transferring the stitches rotated in this way from the first half row onto the third means holding the stitches of the second half row, so that the stitches of the first half row are juxtaposed in an appropriate manner to those corresponding or homologous to the second row. second row; g) operating the engagement of the adjusted stitches on the support means for transporting the joint of the article edges, which correspond to the first and second semi-rows of stitches of the last row of knitting, h ) release the article, with the stitches thus joined from the last row, of the terp, and ps means: i) turn the item upside down, and move it away from the hooking station. Article i) may be omitted, so that the article will result with the hooked part oriented towards its outer side, in a condition either side of the outside or of the invented character, taking the moment when the article is expelled from the hooking station. It is considered worthwhile that the knitting head of the machine represents the assembly of the members, known to those skilled in the art, provided for the formation of the stitches in cooperation with the cylinder needles of a machine of one or two cylinders. In addition, it is emphasized that the stitches of the first and second half-rows of the last row of knitted fabric corespond, respectively, to a first and a second series of adjacent needles, each series comprising a predetermined number of stitch-forming needles. According to an alternative embodiment, an operative method according to the invention comprises, after the formation of the article: u-1 or tubular with the open tip and the stitches of the last row of knitted fabric. subdivided into a first and second semi-rows, the following steps: aa) placing, in correspondence with the head of the machine, first means capable of removing and maintaining the stitches of the last row; bb) transferring the article, with the pieces thus removed and held outside the knitting head of the circular machine; ce) transfer the stitches of the first half row over the second means intended to hold them temporarily; dd) transferring the stitches of the first half row onto third means capable of operating the inversion of the same, that is to say the rotation to 180 ° around an axis (mm) with respect to which the last row of stitches is subdivided in the first and second half-rows, and also capable of supporting the stitches in this step of successive engagement; ee) turn the -article to the re véa; ff) turn the stitches of the semi-row prism around the axis (m-m) 180 °; gg) transferring the stitches of the second half-thread onto the means provided to rotate the stitches of the first half-row, so that the corresponding stitches or homologous of the first and second half-rows will be juxtaposed coaxially; hh) operating the engagement of the stitches thus placed of the first and second half-rows; ii) release the item from the media that holds the stitches that are hooked; 11) Reverse the item and move it away from the hooking station. Step 11) may be omitted as in the preceding case. In addition, step ee) can be carried out at any time, also before step aa, although, however, before turning the stitches of the first half-row. It is understood that, after moving the article away from the knitting head of the machine, it is possible to start the knitting of the following article. Taking into account the fact that the knitted fabric of the tubular article can be executed. in circular machines with one or two cylinders, the fact that the final coupling can be executed ta. n t on the external side as internal of the article, the fact that usually in the two cylinder machines, the lower cylinder - produces the flat stitch and the super cylinder produces the inverted stitch, the fact that, in. the two-cylinder machines, the tip fabric of the article can require lodging of the latter within the cavity of the upper and lower cylinders, so that the articles can be removed from the knitting station with a right side out or in inverted condition respectively, and the fact that, in the machines of a cylinder, the article is usually removed in the right condition, the operating method according to the invention is capable of being implemented in many different ways. faith s. The attached drawings are a synthetic representation of the cases corresponding to the various modes of implementation of the method according to the invention.

CASE A Aquina: type two cylinders Stages Carried out: a) a i) Stitch removal: from the lower cylinder of the outer ring: external Condition of rejected article: turned inside out CASE B Machine: two-cylinder type Stages Carried out: a) ai) Stitch removal: from the upper cylinder Hitch side: internal Condition of rejected article: right side out _ _ _ CASE C Machine: one cylinder type Stages Carried out: a) ai) Stitch removal: from the only cylinder present Attachment side: external Condition of rejected item: turned upside down CASE D Machine: type two cylinders Stages Carried out: a) a h) Stitch-removal: from the lower cylinder Hitch side: external Condition of rejected item: right side has c_i to outside, _ _ _ __ CASE E Machine: type two cylinders Stages ^ Carried out: a) ah) Stitch removal: from the upper cylinder Attachment side: internal Condition of rejected article: turned inside out CASE F Machine: type of one cylinder Etap s Carried out: a) ah) Stitch removal: from the only cylinder present Attachment side: external Condition of rejected article: right side out _ _ CASE G Machine: type two cylinders Stages Carried out: aa) to 11) Stitch removal: from the lower cylinder Side of coupling: internal Condition of rejected article: right side towards afuer - CASE H Machine: type two cylinders Stages Carried out: aa) to 11) Removal of stitch: from the upper cylinder Side of coupling: external Condition of rejected item: turned inside out CASE I Machine: type of a cylinder Stages Carried out: aa) a 11) Stitch removal: from the only cylinder present E ng anche side: external Articulation condition, rejected: turned upside down CASE L Machine: type two cylinders Stages Carried out ": aa) a ii) Stitch removal: from the lower cylinder Hitch side: internal Condition of rejected item: turned upside down CASE M. ,. _.

Machine: type two cylinders Stages Carried out: aa) a ii) Stitch removal: from the upper cylinder Side of deception: ex e rn Condition of rejected article: right side out CASE N Machine: one cylinder type Stages Carried out: aa) a ii) Stitch removal: from the only cylinder present Attachment side: internal Condition of rejected item: turned upside down The method according to the invention can be preferably carried out with reference to those cases which correspond to the expulsion of the finished article in the outward-side condition and the inner engagement. However, it is pointed out that, in the case of external coupling, the finished product is also of higher quality. Next, a first example of the embodiment of the invention is described with reference to FIGS. 1-15 of the accompanying drawings, which corresponds to case B above, that is, important for the manufacture of a woven stocking per item. Go to the traditional way by means of a two-cylinder machine, starting from the hem or edge and ending with the portion that corresponds to the tip that is going to be hooked on the inner side. It should be noted first that usually, in this type of machines, the average is sucked, during the knitting of the same, inside the upper cylinder (1) with the help of the suction tube (3) coaxial to the cylinders of the machine (1; 2), and that the knit members such as needles, sliders and platinums, are i mp u 1 s ~ two in movement by means of cam or equivalent actuators acting on corresponding control surfaces or portions thereof. from the same . At the end of the knitted fabric, the stocking (C) (represented only in some of the figures of the accompanying drawings for purposes of clarity) is coupled to the holes (4) held by the lower cylinder (2), the needles ^ that have the stitches of the last row in them (Figure 1). Accordingly, projection is made to raise pumping needles (4) firstly by means of the corresponding platens 40 placed in closed condition to allow the same stitches to occupy the so-called "unloaded" position, ie the position under the tongue-free end of said needles, and then by means of the plates (40) placed in an open condition, until the heads of the needles (4) -lifted upwards-become hooked by the sliders _ (5) of the cylinder. superior (1) (Figure 2). Under this condition, the needles (4) and the article, copied with the latter through the stitches of the last row of knitted fabric, will be coupled to the upper cylinder (1) by the relevant sliders (5) and uncoupled by the sliders (6) of the lower cylinder (2), whose sliders, after transferring the needles (_4_) _ from the lower cylinder (2) to the upper cylinder (1), are lowered to the level that allows them, not interfere with the operations that will be executed later. Then in the upper and lower cylinders (1,2) they are driven away from each other (Figure 3). It is understood that said cylinders (1, 2) are at least associated with means, not m o s t r a d s in the ducts, that impel them, in their movement in the axial direction. Subsequently, provision is made to bring a mobile unit (7) near the lower base of the upper cylinder (1), the unit having mounted on it the means designed to remove the stitches of the last row of needles (4) ^ tips are still fitted on them (Figure 4). Subsequently, the stitch removal means move close to the heads of the needles (4) (Figure 5) and the stitches of the last row of needles (4) are transferred to the removal means of the mobile unit (7) by means of the combined movement of the last and the anchors that hold the stitches (Figure 6). For this operation, the stitch plane, defined by the plates of the upper cylinder (1) acts as contrast medium, which in practice, is intended to push the stitches of the respective needles (4) towards the means for removal of the unit (7). It is understood that it is also possible to move the upper cylinder (1) and the relevant stitches along it while keeping the needles (4) and the stationary removal means, in order to obtain the same effect. The needle removal means move away from the upper cylinder (1), in an axial direction of the cylinder, together with the article whose last row of stitches is now completely decoupled from the needles. (4) (Figure 7). During this operation, the suction tube (3) may cooperate by properly urging it towards the mobile unit (7) to arrange it with its nozzle (30) in a position that allows it to push the fabric portion of the article engaged by the removal means. and preventing it from spontaneously decoupling from such means until the next decoupling step, which will be described below, is executed. Subsequently, a mobile unit (8) is placed in the area between the first mobile unit (7) and the lower base of the upper cylinder (1), on the next mobile unit (8) the means that are mounted destined to operate the inversion of the stitches of the first half-row (as will be described later) and the means intended to support the stitches that will be subjected to a next stage of engagement. At this point, the mounts mounted on the mobile units e_s_ (7) and (8) move close to each other, and the suction tube (3) moves towards its starting position inside the upper cylinder (1) (Figure 8). In a step immediately following this, the first, - and second mobile units (7,8) and the article (C) at the same time are transferred out of the machine's weaving head, ie, moved as far as possible to reach a separate engagement station (R) (Figure 9) where the stitches removed from the needles (4) are transferred onto the members of the second unit (8) and in such a way that the stitches of the first half row are placed on the means intended to operate the inversion thereof, and those of the second row are finally placed on the support means for the hooking. The transfer of the stitches from the first to the second unit can also take place before the article reaches the hooking station (R). Subsequently, the suction tube (9) provided in the hooking station (R) is urged to penetrate the article whose tip is held open * by the members of the second mobile unit (8) (Figure 10), and the first unit mobile (7) is separate. Subsequently, the stitches of the first half row are rotated 180 ° about the axis (mm) (Figure 11), so that each stitch of the first half row will result, at the end of this stage, placed coaxially with respect to the corresponding stitch of the second half-row. Subsequently, the stitches of the first half-row are transferred by the members of the unit (8) that already hold the stitches of the second half-row (Figure 12) so that, for each stitch of the first half-row, a stitch of the second half-row will correspond.; consequently, the members for turning the stitches of the first half row are returned to the starting point (Figure 13) where the stitching of the first and second half stitches is carried out by means of the hooking machine (90), the stitches which are in coaxial and juxtaposition relation and adjusted on the support members for the coupling (Figure 14). Then, the article _ can be released (Figure __ 15). Aspirando the article inside the tube (9) of the hooking station (R), the investment of the same article and its expulsion in the condition of the right side towards the outside is obtained. Of this ma n e r, the union of the edges of the stocking (C) corresponding to the stitches of the first and second half-rows was considered that the last row of knitted fabric can be considered subdivided into them two. In the figures of the attached drawings, ^ the stitching or hooking line of the bo is made of cloth. is indicated by (LR). A further illustrative embodiment of the present invention relates to case D which is described with reference to Figures 16-29 of 1 or s_ drawings. This example relates to the manufacture of a stocking with the tip hooked on the outer side and knitted by stitches on a two-cylinder circular knitting machine. Therefore, the conditions established in the previous example are kept true also in this case. However, it is possible to retain the mean in the cylinder s u p r e r (1), as is usually done, and then introduce it into the lower cylinder (2) at the end of the knitted fabric. This can be obtained by means of the suction system commonly provided in the upper cylinder (1). Once the knitting is completed, the stitches of the last row are hooked to the needles (4) held by the lower cylinder (2) (Figure 16) and the cylinders (1,2) are adequately separated to allow the execution of the following stages. Subsequently, the needles (4) are raised (Figure 17), with the plati s (4 Oj placed in closed condition, until each stitch results in the desired position number - ie, below the tongue of the corresponding needle (4) (the elevation of the needles (4) which is possibly operated also before separating the cylinders from the knitting machine.) Subsequently, with the platens that are covered, the needles (4) ) are raised to place the stitches of the last row in a position on the upper plane of the plates, at this point, provision is made for the elevation of the plate spots (400), at least in the regions where the plates they are open, so as to prevent the stitches from being spontaneously placed again under the upper plane of the plates It is important to remember that the plate stains are members, known to those skilled in the art associated with the plates and destined for to cover the recess under the peak of the same avoiding in this way that the stitches are entangled in "the same. This operation is necessarily similar to the two-cylinder circular machines to which this example refers, which do not provide for the closing or simultaneous opening of all the plates, the movement of the plate spots (400) which is controlled by a suitable external cam (410). Subsequently, a first mobile unit (7) is located in the working region of the needles (4), the unit that has mounted on it, the means used to remove the stitches of the last row present on said needles (FIG. 18). Then, the stitch removal means moves near the heads of the needles (4) (Figure 19). Subsequent to this, the stitch removal means are lowered, together with the needles (4), so that each stitch is transferred onto the corresponding re-dodion member, due to the fact that the support plane provided by the platens forces the stitches. stitches to extend therein insofar as they are penetrated by the removal members and abandoned by the needles (Figure 20). As an alternative, the "lower cylinder - (2) can be driven, together with the respective platens (40), with respect to the unit (7), thus achieving the same effect. (7), together with the removal means on which the stitches of the last row of knitted fabric are now loaded, moves away from the lower cylinder of the machine (2) (Figure, 21). During this step, use may be made of the tube (3) to prevent any of the stitches from being removed from the removal media. For this purpose, the tube (3) can be suitably raised together with the unit (7) to place it with suction nozzle (30) by pushing the portion ~ of article fabric attached to the removal means. After this, to this first mobile unit (7) there is associated a second unit (8) on which are mounted the means intended to reverse the stitches of the first half-row, as well as the means to support the stitches in a coupling stage. successive (Figure 22), and the suction tube (3) is lowered to its nozzle (30) is below the two mobile units (7,8) to allow placement, along with the average thus coupled (C), in a separate engagement station (R) (Figure 23) wherein the transfer of the stitches from the members of the first unit (7) to those of the second unit (8) take place. This last operation can also be executed in advance, that is, on the units (7, 8) that are in correspondence with the knitting machine, or during the movement thereof. The suction tube (9) of the hooking station, (_R) can advantageously suck the fabric of the article (C) for better control of the next step and to transport the ejection of the same article after hooking. After, the first mobile unit (7_) is remote (Figure 24) and the stitches of the first half row are inverted 180 ° around that axis that virtually subdivides the last h 11 e a- into a first and second half-rows (Figure 25). At the end of this stage, each stitch of the first half row is coaxial to the corresponding stitch of the second half row. Then, the stitches of the first half row are pushed onto the hook support means, which already accommodate the stitch of the second half row (Figure 26), and the reversal means move back towards their starting position (Figure 27) . Then, the first and second half-rows are engaged. (Figure 28). Subsequently, the finished article is discharged from the means that had carried out the coupling -on the external environment. For this purpose, the provision of the suction tube drive (9) is made upwards on the stitch support means for engagement (Figure 29). Vacuuming the stocking inside the tube (9) results in ejection in the condition, from the right side to the outside. What has been described above with reference to Figures 16-29 is directly applicable for the treatment of an average manufactured by means of a one-cylinder machine under the conditions of Case F. A further example will be given below with reference to Figures 30-45, in relation to "Case I of an average produced by half a cylinder and whose final tip hitch is operated by the inner side, the knitted fabric of the stocking starts from the edge of the hem and ends at the side of the tip that remains open, with the stitches of the last row that fit over the needles (4). At the end of the knitted fabric, the stocking is hooked to the needles (4) on which the stitches of the last row of knitted fabric are present (Figure 30). respective (100) moves away from the cylinder (11) to allow the regular execution of the following stages (Figure 31) Subsequently, the needles (4) of the cylinder (11) are raised with the plates that are closed, until the stitches res u_l tan in the unloaded position, then, the needles (4) are raised m s up, with the sinkers (40) are open, so that all the stitches of the last row of knitting are in a position above the sinkers. At this point, all the platens (40) are closed. A first mobile unit (7) moves near the working region of the needles (4), on the mobile unit means that are mounted for the removal of the stitches of the last row from the respective forming needles (4) (Figure 32) and after this, the removal means move close to the needles (4) of the cylinder (11). At this point the needles (4) of the cylinder (11) are driven in motion and the removal means move with respect to the cylinder (11) and the platens (40) to transfer the stitches from the needles (4) towards the means of removal (Figure 33). Subsequently, the removal means, with the stitches of the last row of knitted fabric loaded thereon, are moved from the cylinder (11) (Figure 34) and, to prevent the stitches from accidentally disconnecting from the means of removal,. it is possible to suitably propel the suction tube (3) of the knitting station (T) in a movement similar to Cases B and D below. Then, the first mobile unit (7) is associated with a second unit (8), on which the means capable of receiving and retaining the stitches of the first half-row as well as the means for retaining the stitches are mounted. of the second half-row on the respective removal means of the first unit (7) (Figure 35). Provision is then made to transfer the two mobile units (7,8), together with the article (C), towards a separate latching station (R) (Figure 23) where the article is sucked into the tube (9) rovisto n this station (Figure 36). At this point, the stitches of the first semihilera are transferred onto the receiving means and holding the second unit (8) (Figure 37), to keep the same plane of the stitches of the second semihilera to avoid-overstretching of the cloth. This operation can also be carried out before the two units (7, 8) enter in correspondence of the coupling station (R). After the means for removing the stitches of the first semihilera move (Figure 38) and their place is taken by means .sostienen stitches to be hooked (Figure 39) and provided on a third movable unit, (, After this, the suction tube (9) is driven in motion to be placed on the mobile units and inserted into the article (C) in the use of the formation (Figure 40). turned upside down and out of the tube (9). therefore, the stitches of the first semihilera are transferred onto the support means engaging the third mobile unit, the medi crs support stitch for a latch stage subsequent which is also provided for the inversion of the stitches of the first semi-row A detailed description of the viable modality of these means is given below: The next stage is to reverse the first semi-row of stitches 180 ° about the axis that virtually subdivides the stitches of the last row of knitted fabric into the stitches of the first and second rows respectively, after the means associated with the second mobile unit (8) are separated (Figure 41). After the completion of this step, each stitch of the first half-row will be coaxial to a corresponding stitch of the second half-row. Subsequently, the stitches of the second half-row are transferred over the means, the engagement support of the third mobile unit (14) very close to those of the first half-row (Figure 42). Then, the means for removing the stitches of the second half-row are moved to join those provided for the removal of the stitches of the first half-row (Figure 42), and the hooking of the stitches fitted on the supporting means of Engagement is carried out (Figure 4 '3). The means that have operated the inversion of the stitches of the first half row are carried back to their respective initial position (Figure 44) and the finished product is released, with the help of the suction tube (9), from the means used for the hook, the tube that is suitably driven to have its nozzle (30) in a position below the hooking means (Figure 34). By activating the suction inside the tube (9), once again the investment of the article is obtained and therefore the expulsion thereof in the condition of the right side towards the outside. It should be noted that, for each of the above examples illustrated above, the engagement can be carried out according to the procedures known to those skilled in the art and, therefore, no further detail will be described. . It will be clear from the foregoing discussion that the operative method according to the invention essentially comprises the following steps: weaving the art in a knitting station (T) preferably by stitches.; removing the stitches from the last row of knitted fabric by means of stitch removal means mounted on a first mobile unit between the first station (T) and a hook station (R); Transfer the stitches of at least one seam on the media, different from those operating the previous removal, which holds the stitches of at least one seam in the successive reversal stage, invert 180 ° the first semi-row of stitches about an axis that virtually subdivides the last row of knitting in the first and second half-rows, - d ^ e way - that places the stitches inverted in correspondence of the stitches of the other half row, ^ ~ - hook the stitches thus placed The following are described the viable modalities of the means mounted on the movable units and usable to carry out the method described with reference to Figures 1 to 29. The members to remove the stitches from minus the last row of knitted fabric from the needles (4) of a circular machine, whether of the one or two cylinder type, are formed of elements ( 70) having a rod (700) with the straight axis associated with the unit (7) through a support - comprising two concentric circular crowns (74,75) connected to the arm (76) of the mobile unit (7) , and between the confronted edges of whose rods (700) of the elements (70) are housed angularly equidistant and with a separation substantially equal to the central distance of the stitches being removed; the free end of the stitch removal elements (70) exhibiting a seat (72) for the head of a corresponding needle (4) during the step of removing the ajd a stitch. The arm (76) of the unit (7) exhibits a hole (760) in correspondence of the opposite end of that which accommodates the removal members (70) to allow the housing thereof on a support column (99) cju to 1, in turn, is received inside a sleeve (830); the sleeve (830) that ~~ is mounted on a base (990) and the column (99) which is maintained in vertical position by means of a collar bracket (900) provided on the opposite side of the base (900). The members intended to hold the stitches during the hooking stage consist of a plurality of hooking points (80) - angularly equidistant fixes and with the separation corresponding to one of the stitch removal elements (70) -, to a support corresponding semicircular (81) comprising two co-axial and overlapped semi-cords (810, 811) between the confronted surfaces of the rods (800) and the tips (80) that are housed in the end of an arm (82) provided with a hole (83) to allow the latter to be housed on the sleeve (830). ) previous. Alternatively, the above hitch tips may be associated with the third mobile unit (14). For purposes of clarity, the tips of the third mobile unit (14) are indicated with (180) instead of (80) as those of the second mobile unit (9). The members intended to invert the stitches of the first half row over those of the second half row after being received from the elements 70 of the first mobile row 7, are formed of bodies 84 with straight rods (840). mounted on a corresponding semicircular support (85) comprising two coaxial half-cores (851,852) between the confronted surfaces of which rods (840) of the bodies (84) are thus housed to be equidistant and with a spacing corresponding to that of the elements (70) firm to the first mobile unit (7); the head portion (841) of each of the bodies (84) that is suitably formed to be able to fit inside the end seat (72) within a corresponding stitch removal element (70) and allow the end free of the respective tips (80) fit therein in order to receive the stitches present thereon, the support (85) of said bodies (84) which is coaial and complementary to that of the tips (80). The support (85) of the bodies (84) is provided with a radial appendage (850) connected by a hinge (821) to an external lateral appendix (820) of the arm (82), the "articulation axis which is orthogonal to the arm so that the two supports (81, 85) associated with this beam will take the form of two semicircular jaws * of a subjection with the possibility of closing around the wall (3) and / or around the article (C) in the station (T) in order to form, in said closed condition, the configuration of a circular crown corresponding to the support (74,75) of the removal members (70 *). 'To rotate the support ( 85) around the axis (mm), the radial appendix (850) of the support (85) is associated with the rotary actuator (822) whose axis is located on the extension of the diametral axis (nn) of the support (85). shown in Figure 49, the axes (mm) and (nn) overlap to transfer the stitches from the removal members (70) towards the transfer members (84) provision is made for means that push the stitches from the unit (7) of the removal members (70) towards the unit of transfer members (84), with a tubular body ( 77), formed in one piece as illustrated in Figures 1-15 and 18-29 or in a plurality of separate elements (770) as illustrated in Figures 38-45, carried out by the first unit (7); the tubular body (77) exhibits an annular edge (770) oriented towards the removal members,, (7J)) and mentioned to push from behind the stitches present therein as a result of its movement towards the second mobile unit (8) (as indicated by the arrow "Q" of Figure 9 and Figure 23) or of the movement of the unit (8) towards the same body (77) (as indicated by the arrow "QQ "of Figure 37). Similarly, to transfer the stitches from the transfer members (84) to the tips (80) of the unit (8), a semicircular element (815) can be used that is capable of being placed between the two semi-cords ( 81,85) of this unit (as illustrated in Figures 12 and 26); the edge of the semicircular element (815) having the function of pushing from behind the stitches of the transfer members (84) to allow the same stitches to move on the tips (80). The arms (76) and (82) are suitably associated with "motor-driven members provided with electric or pneumatic control, not shown in the figures of the accompanying drawings, while the means for implementing the method described with reference to Figures 3JD-_45 are related, the unit (7) on which the members (70) for the removal of the stitches of the article- (C) - knitting needles (4) are assembled, comprises two semicircular supports transported by a corresponding actuator arm (£> 2) between stations (T) and (R), arm (62) which is in two elements (60, 600) connected by an eartical pin (66) to allow separation vertical of the supports under the control of the actuator not shown in the drawings The two elements (60, 600) of the arm (62) both are provided with a hole for its hinge connection to a support column (500). Each of the supports is conf Ormed of two concentric semicircular crowns (64,65) between the confronted edges of the members _ of the members (70) for the removal of the stitches from the knitting needles that are housed. The transfer members (84) are mounted on a corresponding support comprising two concentric semicorns (33)., 34) between the confronted edges of the rods of the same transfer members ("8) that are housed, the support that is supported at the end of an arm (35) formed by two elements (36,360) connected by a vertical pin (37) that guides the relative vertical displacement thereof under the control of an actuator not shown in the drawing; attached to the element (360) the arm (35) is the support of the transfer members (84), and fixed to the other element (36) is the support of * a body (38) having semicircular development and which is intended for retaining the stitches of the second semi-hinge on the members (70) of the unit (7) Or so that the transfer bellows (84) receive the stitches of the first half-row and the change of the stitches between the transfer members. (34) and the tips occur, as illustrated in Figures 35-40. The support (50) of the tips (180), on which the points are adjusted to the hooking stage, is semicircular and fixed to a corresponding rotating actuator (53) which, in turn, is mounted on an accisator arm (51) provided with a hole that allows it to be hinged to said column (500). It will be appreciated that the method according to the invention can be carried out according to different modes, depending on the type of machine used for the knitting of the article and the textile grade that is reached. Practically, all the details of construction can vary in any equivalent way while the dimensions, shape, arrangement of elements and nature of the materials used * are involved, without departing from the scope of the solution adopted by the idea and therefore, it remains within the limits of protection granted for the present patent for industrial invention.

Claims (19)

1. Operating method for sewing the edges of a tubular knitting article, comprising the preliminary steps of knitting the article in a knitting station, removing the stitches from the last row of knitting per knit with removal means of stitches mounted on a first mobile unit between the station and the hook station, invert 180 ° the first semi-row of stitches around an axis that virtually subdivides the latter. a row of knitted fabric in the first and second half-rows to match the inverted stitches in correspondence of the stitches of the other half-row, hooking the stitches thus placed -from the first and second half-rows, characterized in that it comprises, following the removal stage of the stitches of the last row of knitted fabric, the transfer of the stitches of at least one semi-row over different media from those operating the previous removal, the transfer means holding the stitches of at least one half-row during the investment stage.

2. The method according to claim 1, characterized in that, during the engagement of the stitches of the first and second half-rows, the stitches are supported by means of the inversion of the first half-row of stitches.

3. The method according to claim 1, characterized in that the step of transfer is for the stitches of the first and second half-rows.

4. The method according to claim 1, characterized in that the transfer stage is for the stitches only of one s emi h i 1 e a. . , _ •

5. The method according to claims 1 and 4, characterized in that the reversing step is carried out after the transfer of the stitches of the first half-row on corresponding members of the temporary support and then on support members of the .e apa of investment.

6. The method. _ according to claims 1 and 4, characterized in that the reversing step is carried out after the transfer of the stitches of the first half-row on the corresponding members of the temporary support of a second mobile unit between the stations and then on the support members of the investment members.

7. The method according to claim. 1, characterized in that the article is knitted with a circular two-cylinder machine.

8. The method according to claim 1, characterized in that the art i c ul is knitted with a circular cylinder machine.

9. The method according to claim 1, characterized in that it involves the inversion of the article in the hook station and in the knitting station.

10. An apparatus for sewing the edges of a tubular knitting article comprising a tubular knitting machine for the knitting of the article in a knitting station, means for removing stitches from the last knitting stitch , the means that are mounted in a first mobile unit between the station and a hook station, means for 180 ° reversing the first half row of the stitches about an axis that virtually subdivides the last row of fabric by point in the first and second rows semi-rows, means for supporting the stitches of the first and second half-rows thus placed for hooking thereof, characterized in that it comprises receiving or transferring the stitches of at least one half-row, - * The transfer means which are those provided for the previous investment and that are separated from the stitch removal means and mounted on a corresponding support.

11. Stopper according to claim 10, characterized in that the means for stopping or transferring at least one semi-row of stitches are mounted on a mobile unit between the knitting station and the hooking station.

12. The apparatus according to claim 10, characterized in that the means for removing the stitches of the last row of fabric per point comprise a plurality of elements with a rod associated with a unit corresponding to * through a support comprising two 'crowns concentric circulars connected to the arm of the mobile unit and between the confronted edges whose rods of the elements are housed angularly equidistant and with a spacing substantially equal to the central distance of the stitches to be removed; the free end of the stitch removal elements exhibiting a corresponding needle head seat during the stitch removal step, the arm of the exhibiting unit, in correspondence to the opposite end of that for housing the stitch. Removal members, a hole to allow it to fit over a support column that is in turn fitted into a sleeve mounted on a base. ~~~ -

13. The apparatus according to claim 10, characterized in that the means supporting the stitches during the hooking stage comprise a plurality of hooking tips fixed to a corresponding unit by means of a semicircular support, with two co-axial semi-pockets and overlapped between the confronted surfaces. of which the rods of the tips are housed angularly equidistant at the end of an arm provided with a hole to allow adjustment thereof within a sleeve mounted on a base.

14. The apparatus according to claim 10, characterized in that the means to be supported, the stitches to be invoked include a plurality of bodies with corresponding rods mounted on a semicircular support with two co-axial half-poles, between the surfaces confronted of which the bodies' offshoots are adjusted angularly equidistant; the bodies that are associable to the stitch removal means and means to support the stitches that will be inverted. -

15. The apparatus according to claims 10 and 14, characterized in that the support of the bodies is provided with a radial appendage connected by an articulation to an external lateral appendage of said arm, the axis of the articulation being orthogonal to said arm.

16. The apparatus according to claims 10 and 15, characterized in that the radial appendix of the support is associated with a rotary actuator whose axis is located in the extension of the diametral axis of the support, the axis corresponding, following the rotation of the actuator, to the Stitch inversion axis.

17. The applet according to claim 10, characterized in that the first mobile unit, on which the means for removing the stitches from the knitting needles per knit of the article are assembled, comprises two semicircular supports carried by a corresponding actuator arm between the stations; the arm that is of two elements connected by a vertical pin to allow the vertical separation of the supports under the control of a linearly acting actuator, the two elements of the arm that are provided with a hole for its articulation connection to a column of support, and each of the supports that is formed of two concentric semicircular crowns between the confronted edges of which the members rods for the removal of the stitches from the knitting needles are housed.

18. The apparatus according to claim 10, characterized in that the stitching transfer means comprise a plurality of bodies mounted on a corresponding support with two concentric semicorns semicircular between the confronted edges of which the rods of the transfer means in a - ± a are housed, and transported at the end of an arm in the elements connected by a vertical pin that guides the vertioal displacement thereof under the control of a linearly acting actuator; fixed to the element of the arm is the support of the means of transfer, and fixed to the other element is the support of a body having a semicircular development.

19. The apparatus according to claim 10, characterized in that the stitch support means for engagement comprises a plurality of engagement tips mounted on a corresponding semi-circular support which is fixed to a corresponding rotary actuator which in turn is mounted on an actuator arm provided with an orifice for its articulation connection to the column.