EP0126035A1 - Device for producing knitted pockets with the aid of a circular machine for products manufactured in a tubular way with continuous unidirectional movement, and machine equipped for this device - Google Patents

Abstract

A machine for knitting tubular fabrics by using a cylindrical array of (double barbed) needles is complemented by an external concentric shell and cam with oblique edges and an adjacent peg such that for each full cycle of the machine, the shell can accelerate to one angular position and halt for the cam to control selection of needles between thread pick-up and release positions, to allow formation of partial rows of meshes, then restores the needle positions while rotating to the start position for the next cycle.

Description

The present invention relates to a device for forming knitted pockets with a circular machine for tubular manufactured products with continuous unidirectional movement and a circular machine thus equipped.

From the Italian invention patent Do. not. 9434A / 82 of a co-holder there is known a process for forming a mesh pocket in a tubular manufactured product with a circular machine for hosiery with continuous rotary movement which consists in providing an additional thread for the partial rows of stitches which is continuous and it is provided by an additional thread guide, turning around the needle cylinder with varied movement, stopping, at each turn, in correspondence of a first mesh formation position to supply the needles with an arc of needles which pass in front of it, therefore by going beyond the said needles until a second knitting formation position is matched and from here continuing with constant speed, but greater than that of the needle cylinder and finally, after a complete revolution, stopping in the initial position.

From the Italian patent Application n ° 9309A / 83 of the same co-owner there is also known a device for feeding the wire from the additional wire guide intended for the formation of the second partial row of stitches according to the method of which in the invention patent Do. n ° 9434A / 82 mentioned above, which device allows to accumulate a quantity of wire to the just measure required for the formation of the second partial row of stitches, without tension.

The main object of the present invention is that of proposing a different subsequent device for carrying out the method which, in the first invention patent Do. not. 9434A / 82 above, very simple and efficient so as to obtain a circular machine of great reliability and versatility and low cost.

This has been achieved in accordance with the present invention by adopting the idea of using a working or falling system with a cam with two active profiles, a cam follower and a stake, positioned outside and concentric with the cylinder of the needles. , engaging the needles predisposed for the formation of partial rows of stitches and rotating in unison with the cylinder, with varied movement and in such a way that - at each turn - the said fall stops in a position with behind the guide- additional thread so that one of the two profiles of said cam operates a first fall of said needles which form a first partial row of stitches, then it accelerates and exceeds said needles while standing behind said additional thread guide that the stake causes the lifting of said needles from the level of "retained" to that of "discharged" and the second profile of said cam causes the second drop of said needles which form a second partial row of stitches; finally it decelerates to return and stop, after a complete revolution, in the initial position.

The advantages obtained by virtue of the present invention essentially consist in the fact that various manufactured products are obtained with pockets of various shapes, sizes and positions, with continuous wire and with unidirectional movement of the circular machine; that among the feasible manufactured products there are stockings and socks with heel and pocket stitch, panties with gusset and stockings with semi-gusset for tights with gusset; that pockets can be obtained with several yarns of different nature, fineness and color; that it is possible to use circular machines, with single or double cylinder needles, with many feeds for the formation of the tubular and with two or multiple of two additional feeds for the formation of the mesh pockets; that the needles can be selected to obtain pockets with patterned fabric; that it is possible to operate with great reliability and safety even at a much higher speed than that obtained today with circular machines with reciprocating motion; that a production far superior to that of said alternative machines is obtained; that the product obtained is of very good quality; .that the relative simplicity of construction makes it possible to equip a circular machine for hosiery at a very studied and competitive cost.

The invention is set out below in a more detailed manner with the aid of the appended drawings, which show only one embodiment.

In Table 1 FIG. 1 shows the plan view of a fall according to the invention, excluding work; FIG. 2 represents the fall of FIG. 1 in the work phase during training in stoppage of the first partial row of meshes; FIG. 3 represents the fall of FIG. 1 in the working phase during the movement training of the second partial row of quail; in Table 2 FIG. 4 shows the sections at different speed of one turn of the chute and the additional wire guide with, in the center, the cam for obtaining the relative speed; in Table 3 FIG. 5 shows an axial vertical section of a circular machine for hosiery fitted with a device according to the invention; FIG. 6 shows the detail plan view of a device for phasing the additional wire guide associated with the drop according to the invention; in table 4 FIG. 7 shows the plan view of a device for controlling the rotation of the chute and of the additional wire guide according to the invention; in table 5 FIG. 8 shows the developed section of a part of the device of FIG. 7; in Table 6 FIG. 9 shows the expanded section of the remaining part of the FIG device. 7.

• - une chute (200) concentrique et extérieure au cylindre (1) des aiguilles, avec una camé (201) à deux bords actifs (211-212) avec la fonction d'opérer deux chutes distinctes des aiguilles, une contre-came (202) au-dessous de la came (201) et un piquet (203) en face de la dite came (201) dans le sens de rotation en avec la fonction de soulever les aiguilles du niveau de "retenu" à celui de "déchargé": la dite chute, qui est reliée au boîtier (53) des platines situé ci-dessus, tourne à l'unisson avec le cylindre (1) dans une seule direction, avec mouvement varié et intermittent et d'une telle sort qu'elle s'arrête en (A) de FIG. 4 en correspon dance d'une première zone de formation maille pour permettre au profil (211) de la came (201) d'obtenir una chute des aiguilles (3) d'un arc partiel (par exemple 135°) d'aiguilles et ainsi former un premier rang partiel de mailles; puis elle accélère jusqu'à (B) de FIG. 4 où elle atteint une plus gran de vitesse de travail (par exemple: double) que celle du cylindre des aiguilles, et d'ici elle poursuit jusqu'à (C) de FIG. 4 avec vitesse constan te pour dépasser les aiguilles du dit arc partiel et permettre au piquet (203), en collaboration avec le profil (212).de la came(201), d'obtenir un soulè vement suivi d'une chute des dites aiguilles dépassées et former ainsi un deuxième rang partiel de mailles; enfin de la position (C) la chute décélère pour se reporter et s'arrêter en (A) de FIG. 4.

Reduced to its essential structure and with reference to the accompanying drawings, a device for training tion of knitted pockets with continuous movement of a circular machine for manufactu ₇ tubular res according to the invention comprises:

• - a fall (200) concentric and external to the cylinder (1) of the needles, with a cam (201) with two active edges (211-212) with the function of operating two distinct falls of the needles, a cam follower (202 ) below the cam (201) and a stake (203) opposite the said cam (201) in the direction of rotation with the function of raising the needles from the level of "retained" to that of "discharged" : the said drop, which is connected to the housing (53) of the plates located above, rotates in unison with the cylinder (1) in one direction, with varied and intermittent movement and of such a fate that it stops in (A) of FIG. 4 in correspondence of a first mesh formation zone to allow the profile (211) of the cam (201) to obtain a drop of the needles (3) of a partial arc (for example 135 °) of needles and thus form a first partial row of stitches; then it accelerates to (B) of FIG. 4 where it reaches a greater working speed (for example: double) than that of the needle cylinder, and from here it continues to (C) of FIG. 4 with constant speed to exceed the needles of said partial arc and allow the stake (203), in collaboration with the profile (212). Of the cam (201), to obtain an uplift followed by a fall of said needles exceeded and thus form a second partial row of stitches; finally from position (C) the fall decelerates to refer and stop in (A) of FIG. 4.

Said fall is further, by known means, de can be placed radially in relation to the needle cylinder to vary the distance and thus engage the needles with separate arcs of the needles in relation to the pocket to be produced (e.g. the heel or toe with closure in the lower part of the foot) 'a low).

• - un guide-fil supplémentaire (98) disposé radiale ment en tete du cylindre (1) et au-dessous du plateau (92) et porté en rotation par un arbre (97) creux, passant dans l'arbre vertical du plateau (92): la cavité du dit arbre (97) est utilisée pour le passage du fil de formation de la poche et de l'air aspiré par le goulot (100) prévu au service du dit guide-fil supplémentaire.

And a circular machine for tubular manufactured products equipped for the said device includes:

• - an additional wire guide (98) arranged radially at the head of the cylinder (1) and below the plate (92) and carried in rotation by a hollow shaft (97), passing through the vertical shaft of the plate (92 ): the cavity of said shaft (97) is used for the passage of the pocket forming wire and the air sucked by the neck (100) provided for the service of said additional wire guide.

The rotation of the additional thread guide (98) which is in harmony with that of the cylinder (1) takes place with varied and intermittent movement and so that, at each turn, it is stopped at (A ') of FIG. 4 behind the cam (201) of the aforementioned fall (200) during the first feeding, then it accelerates sharply to (B ') of FIG. 4 and from here it continues to (C) of FIG. 4 with constant speed to provide the yarn for the second feed; finally from position (C) it decelerates to stop in the initial position (A '). Said additional thread guide (98) is also notoriously displaceable radially to the cylinder (1) so that its mouth results, during the working phase, projecting outwards from the head of the needles and, outside work, it results in the vicinity of said neck (100).

It goes without saying that said additional thread guide (98) can be associated with one or more similar thread guides, positioned, superimposed or approached, to allow feeding with several pieces. - Several tongue tabs (3) with double heel (130) distributed along the partial arc of needles provided for the formation of a pocket, including the upper heel, at each turn of the cylinder (1) is engaged by one (211) of the two profile of the cam (201) for the first fall and by the stake (203) for the successive lifting of "retained" to "discharged" and by the other (212) profile of the cam (201 ) for the second fall.

The needles (3) belonging to separate partial arcs, that is to say intended to form separate knitted pockets of the same manufactured product, have the upper heel of different length to be selected by the fall (200) previously positioned at corresponding cylinder distances (1).

- A cog to obtain, in harmony with the rotation of the cylinder (1), the unidirectional rotation of the chute (200) and at the same time of the additional thread guide (98) with the varied and intermittent movement previously described, which comprises a planetary gear with coincident axes, with the main wheels (221-225) on the axis (220), the satellite wheels (222-224) on the axis (223) and the train carrier (226) with a caster (227) in contact, forced by a spring (246), with the edge of the cam (228) wedged on the motor shaft (231); the movement derived from the cylinder holder (229) by means of the wheel (230) wedged on the shaft (231) is transferred to the main wheel (221) by the said planetary gear by means of the clutch (232) and the wheels (233-234-234 '); and by the main wheel (225) of the same epicyclic train it is transmitted, by means of the wheels (235-235'-236-236') to the transmission shaft (237 ) and by the latter at the fall (200) by means of the wheel (238). In addition the movement is transmitted by the said shaft (237) to the shaft (97) of the additional thread guide (98) to the by means of an epicyclic train with coincident axes, with the main wheels (239-241) on the axis (237), the satellite wheels (240-242) on the axis (243), the train carrier (245) , the wheel (241 ') and a toothed belt (246).

The train carrier (226) of the first planetary gear can move in both directions, relative to a median position for which the gear transmission ratio is that defined by the number of teeth of the wheels (equal to one) while '' it is positive or negative with the movement of the train carrier in one direction or the other: so the instantaneous position of the train carrier (226) controlled by the position of the caster (227) on the cam (228) determines the instantaneous speed of the fall (200) and of the additional thread guide (98). Similarly the train carrier (245) of the second planetary gear train, which has two possible working positions defined by the contact of a caster with a cam fixed on the shaft (237) and not shown for simplification, determines the instantaneous position additional thread guide (behind or in front) by rap port at the fall (200).

As a replacement for the reciprocating movement from front to rear of the train carrier (226), provision is made for obtaining a varied and discontinuous unidirectional movement by using a cam (228) with a snail profile or irregular Archimedean spiral, including the angular edge, one at a time, several rollers (227) of the train carrier (226).

In order to increase the size of the knitted pockets and even the number of additional double feeds, it is planned to rotate the needle cylinder with variable speed rather than constant, by slowing down or stopping in the row weaving phase. partial meshes with the drop (200) in motion.

Claims (13)

1) Device for the formation of knitted pockets with a circular machine with continuous movement, the additional thread guide (98) feeding the needles (3) responsible for the formation of a pocket with two feeds per revolution, one off and one in motion, characterized by the fact that it includes: - a drop (200) external and concentric to the cylinder (1) of the needles with a cam (201) with two active edges (211-212), a cam follower (202) located below, and a stake (203) positioned forward, in the direction of rotation, with respect to said cam (201), which fall (200) rotates in harmony with the cylinder (1) of the needles with varied and intermittent movement, so that, at each revolution , it stops in a position (A) whose edge (211) of the cam (201) operates a first fall, in stop, of the needles (3) predisposed for the formation of a pocket; then the fall (200) accelerates to a position (B) from which it continues until (C) with a constant speed and greater than that of the cylinder (1) to exceed the said needles (3) and allow the stake (203) to raise the needles (3) from the "retained" level to the "unloaded" level, and at the edge (212) of the cam (201) to operate the second fall, in motion, of the same needles (3); after which the fall decelerates to stop in the initial position (A). 2) Device according to claim 1) characterized in that the active edges (211-212) of said cam are arranged at V. 3) Device according to claim 1) characterized in that said drop (200) is displaceable radially to the cylinder (1) to allow the engagement of the needles (3) for the formation of partial rows of meshes, distributed on along several partial arcs of the cylinder (1). 4) Circular machine for tabular manufactured products equipped for a device according to one or more returns from 1) to 3), characterized in that it comprises: - at least one additional wire guide (98) turning at the head and in harmony with the cylinder (1) of the needles and in phase with the said fall _' (200) so that - at each turn - it stops in (A ') behind the fall (200) positioned in (A), then it accelerates up to (B') to pass the fall (200) positioned in (B), then it turns with the same speed of the fall ( 200) to (C) and finally it decelerates until it stops in the initial position (A '); - Several needles (3) with double heel, for the formation of partial rows of stitches, distributed according to one or more partial arcs of the cylinder (1) of the needles; - Means for carrying in rotation with varied movement the chute (200) and the additional thread guide (98); - Means for bringing the position of the additional thread guide (98) into phase with the position of the drop (200) during the respective rotation. 5) Machine according to claim 4) characterized in that the upper heel (130) of the needles (3) with double heel, has a different height along the corresponding partial arc of the cylinder (1) 6) Machine according to claim 4) characterized in that with a first additional thread guide (98) are associated one or more similar thread guides, superimposed or approached together to provide several different yarns. 7) Machine according to claim 4) characterized in that the said means for rotating the chute (200) and the (the) wire guide (98) comprise an epicicloidal train with coincident axes (220-223) with the main wheels (221-225) and satellites (222-224) connected by a train carrier (226) with reciprocating rotary movement and the instantaneous position of which is determined by the contact of a roller (227) of the train carrier ( 226) with the edge of a cam (228). 8) Machine according to claim 7) characterized in that the profile of said cam (228) is preset in relation to the diagram of the speed of the fall (200). 9) Machine according to claims 7) and 8) ca characterized by the fact that said train carrier (226) moves with varied and discontinuous unidirectional rotary movement and its instantaneous position is terminated by the contact of one or more rollers (227) with the edge of a cam (228) in the form of an irregular Arehimedes spyrale. 10) Machine according to claim 4) characterized in that the said means for phasing the additional wire guide (98) relative to the drop (200) comprise an epycicloidal train with coincident axes (237-243) with the main wheels (239-241) and satellite wheels (240-242) connected by a train carrier (245) which has two working positions to which correspond the positions of the thread guide (98) respectively, behind and opposite the chute (200) and whose instantaneous position is determined by the contact of a trainer caster (245) with a cam wedged on the shaft (237). 11) Machine according to claim 10) characterized in that the profile of said cam is predetermined with respect to the diagram of the falling speed (200). 12) Machine according to claim 4) characterized in that the cylinder (1) of the needles is rotating with unidirectional movement, varied, with slowdowns and / or stops in the formation phase of partial rows of meshes with the fall 13) A product manufactured with a circular knitting machine equipped according to one or more claims from 4) to 12).

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