MXPA98008903A - Method and mechanism to close the point at the beginning of the process of manufacturing a medium or socket in a knitting machine circu - Google Patents

Abstract

The present invention relates to a fabric for the toe bag is formed first by the needles (1) of a first semicircle (A), and then, to transfer the initial free edge (T1) of the bag (T) to the In addition to the needles of the complementary arc and thus initiate the tubular tissue, a concentrated air suction region is created by means of a mouth (22) extending around the lower part of a portion of the circle of needles to capture the free edge of the needle. the bag in transit, then, by means of centrifugal movement of plates, each provided with a spike, the free edge (T1) moves progressively beyond the circle of the needles, which rise and pass through the tissue (T) around the initial edge (T

Description

METHOD AND MECHANISM TO CLOSE THE POINTER IN THE HOME OF THE PROCESS OF MANUFACTURING A MEDIA OR SOCKET IN A CIRCULAR KNITWORK MACHINE BACKGROUND TECHNIQUE In circular machines to produce socks or stockings, one of the methods to close the toe of the garment directly inside the machine that produces the latter is to start its formation with the same tip, that is, the base, rather than with the fist or upper edge; after the formation of a series of stitches to start the article, only one needle arc is used, which approximately corresponds to one half of the circumference of the cylinder, to make the portion of fabric that formed the toe of the garment, after which the free edge of the tissue portion is transferred to and on the needles of the opposite arch of needles corresponding to the remaining semicircle of the cylinder. This transfer can take place in two stages: In the known methods this is first initiated by mechanical members that hook the tissue to be transferred and place it in such a way that, in the second stage, other mechanical members intervene on this to complete its transfer to the needles of the opposite arch, which proceed to "reticularize" the tubular portion of the article, the manufacture from which it proceeds from this moment forward. However, this necessarily involves a non-negligible complexity of the mechanism necessary to carry out the operations indicated above, and of the mechanical members of which this mechanism is composed. DESCRIPTION OF THE INVENTION The present invention, by contrast, greatly reduces the complexity of the mechanical members to achieve this transfer of the portion of tissue that will form the toe of the garment, while offering other results and advantages that will be clear from a reading careful of the following text. According to the present invention, then, the first stage of the transfer of the portion of fabric that is going to form the toe of the garment is made using the pneumatic suction system generally present in circular machines for the purpose of lowering and tensioning the article during its production - to create a concentrated air suction region, this is a concentrated suction stream, around the semicircle of airs where the tissue section will be formed, and, therefore, around the free edge of this portion. Since the cylinder of the machine - depending on the case - is operated with a continuous rotary movement, or its rotary movement is reversed each time it has rotated through an arc of 180 °, and since, on the other hand, the orifice through which the suction stream mentioned above enters its fixed position, the free edge of the portion of tissue to be transferred approaches the pneumatic suction stream, is captured by it and is progressively moved towards the arc of the Needle circle opposite the arch where this piece of tissue was formed. At the end of the first transfer stage - which was carried out using air suction - the mechanical members are put into action, consisting of radially movable plates provided with spikes, by means of which they couple the free edge of the spikes. This bag of fabric proposed to form the toe of the stocking or sock, and take them radially outwards, but find the circle of the needles, which rise through it to "reticular" 'the series of stitches with which the article is started and, therefore, to the tubular portion of the garment that is formed after this.

In practice, to create the concentrated air suction region, or concentrated suction stream, a mouth is provided which is connected by a tube to the pneumatic suction system referred to above, and in particular, to the tube that forms part of this system , with a valve that is also provided to close this tube, so that all the suction current goes through the mouth specified immediately above. As an alternative to that described above, the concentrated suction region can be produced by providing a flat component that can be flexed elastically, capable of being moved to cover the inlet opening of the pneumatic tensioning system, with the exception of a slot defined by a cut in the flat component, the groove forms a region of concentrated air suction. To perform the second stage by progressively moving the free edge of the initial fabric, which will form the toe of the garment, out around the circle of needles, the plates can be arranged in the needle arc to which the free edge of this portion of fabric should be worn, and each provided with a spike directed upwards. Since the platens are not only radially movable but can also be raised from their point of gradation, the present invention provides that, during a centrifugal movement of the platens, their pins will project and penetrate the free edge of the tissue being transferred. , and that its centrifugal (radial) movement drags the tissue until it arrives exactly on the circle of needles. For this purpose each of the plates has a downward projection, on its edge inside the cylinder that is driven by the lower part formed from its graduation point of the plate in such a way that it rises during its centrifugal movement. Alternatively. Each of the movable platens may be able to tilt at its graduation point and is lowered at its outermost end at the start or immediately before its supplementary centrifugal movement.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be understood more clearly from the description and the accompanying drawings, which later show a practical, non-restrictive example of an embodiment of the invention. In the drawings: Figure 1 is a schematic plan view with the assembly for suction around the inner side of the needle circle; Figures 2 and 3 are two partial sections of the line marked III-III in Figure 1, illustrating two active positions of the plates during normal work; Figures 4 and 5 show, similarly to Figures 2 and 3, the position of the members at the beginning and during the second stage of mechanically transferring the initial free edge of the toe fabric for its coupling on the needles that go to start the tubular work; Figures from 6 to 9 are perspective views showing successive stages in the transfer of the fabric of the toe bag for coupling by the needles that will start the tubular work; Figures from 10 to 13 show a number of stages in the transfer operation in an axial view, ie in plan view; Figures 14 and 15 show a way to change the suction for transfer operations; Figures 16 and 17 show, in a manner similar to Figures 14 and 15 but with less detail and more partially, an alternative mode to that of Figures 14 and 15; Figure 18 is an isolated view of a stage in two alternative modes; Figure 19 shows a modified version for the intervention of the plates in the second stage of transferring the initial edge of the toe bag; Figure 20 shows a modification to the assembly of the Figures from 1 to 5.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES As illustrated in the Figures from 1 to 13 in the appended drawings, the number 1 indicates the needle cylinder with longitudinal graduation points in which the needles 3 move; In a fixed ring 5 surrounding the upper end of the needle cylinder are the radial graduation points 7 in which the plates 9 move when they cooperate with the needles to form the fabric. 11 indicates the disc having hooks designed to cooperate with the needles and with the plates, in conventional versions of circular knitting machines to produce tubular structured articles such as stockings, socks and the like. 13 indicates the conventional tube to apply suction to the article during its formation to tension the article in such a way that the formation of loops or loops occurs uniformly; the suction tube 13 has a portion 13A of the upper end in the form of a funnel-shaped hole at a level with the working area of the needles. To put the invention into practice the tube 13 with its orifice 13A does not move with the rotary system of the needle cylinder 1. Designed in some of the Figures are the cams 15 for operating the needles 3, and cams 17 for the radial operation of Platinum 9, all of which is conventional. In combination with the fixed suction pipe 13, 13A for the conventional tensioning of the article during its formation, according to the invention, an elongated curved mouth 22 is provided on the inner side of the needle circle 3, as is clearly shown in Figure 1, which defines a region of concentrated air suction, and which is defined by the terminal parts 22A and 22B that connect the latter to the tube 13 and its orifice 13A. The elongated suction mouth 22 is continued in the form of an extra tube 24 in which, as indicated below, a concentration of the suction stream can be fixed through the elongated and curved mouth 22. To produce the suction in the tube 213 for the conventional pneumatic tensioning of the tissue when it is formed, and to produce a concentrated suction through the mouth 22 by interrupting the suction through the tube 13, 13A, a mounting as shown in Figures 14 and 15 can be adopted, which show a disc valve 26 hinged at 28 and operated by a connection 30 to open the tube 13 as shown in Figure 14 and close the tube 13 as shown in Figure 15. In the position shown in Figure 14 the suction can also occur (but very partially) through the extra tube 24 and the mouth 22, but when the valve 26 closes the main suction tube 13, the suction is concentrated in the extra tube 24, with the result that there is a powerful suction through the mouth 22 for the purposes indicated below. An alternative embodiment is shown in Figures 16 and 17, in which a valve 126, equivalent to the valve 26, is articulated at 128 adjacent the extra tube 24, and is operated by a connection 130, in this version a protective device profiled 132 is rigidly attached to the valve 126 but at an angle to the last; the assembly is such that in the open position of the valve 126 (Figure 16) the tube 24 is closed by the protective device 132, such that there is a change in the suction rather than a variation of its force in the tube 24 In the version shown in the Figures from the 1 through 18, the cylinder 1 has walls 36 which correspond in position to the graduation points 7 of the plate 9: these walls extend inwards to protect the plates 9 (a variant is shown in Figure 20). The platens 9 have the conventional holes 9A and the conventional surfaces 9B by means of which they cooperate with the needles during knitting. The plates of at least one semicircle, whose needles will begin to work after the toe bag has been produced, have a projection 38 at its front end that slopes down towards the center of the cylinder to be driven by the end of the lower part of the point of support 7 in which that particular stage moves; its centrifugal movement that is, in the direction of the arrow fC as marked in Figures 4 and 5 - beyond a certain limit to which it moves for its conventional operation - performs a lifting of the front end of the stage, as You will see comparing Figures 2 and 3 with Figures 4 and 5. This additional movement in the direction of arrow fC by the plates can be produced by a special cam that is formed to perform the centrifugal retraction in the direction of arrow fC and also the inclination of the stage, which rises. Each plate 9 of the semicircle which is put into operation after the production of the toe also has (see Figure 18 in particular) a pin 40 profiled upwards, located immediately next to the surface 9B at the opposite end from the opening 9A . This pin 40 is kept out of the way between the walls 36 during the normal operation of the stage in the positions shown in Figures 2 and 3, but projects outwardly when the stage is raised by the action of the projection 38, and in particular of its edge 38A against the inner end 7A of the graduation point 7 of the stage. The plates may be of the ordinary type with a relatively low 9E end, which defines the opening 9A, and is used to be the normal stitches, or with a higher end as indicated by the line of dots and stripes in 9F, in the Figure 18 to be the so-called towel cloth (plush).

In conventional operation to produce a tissue bag for the toe, one or two courses of initial fabric are formed on all the needles to start the production of the article with at least one odd numbered course of stitches 1: 1, and then a course 1: 1 with even numbering in the manner known per se; the machine then proceeds to form the initial TI edge and the T fabric of the toe bag over an arc of needles A which is approximately a semicircle of needles, as indicated in particular in Figures 10 and 11. The formation of the T fabric of the toe bag is achieved either by working with the reciprocating motion of the needle cylinder or by a continuous circular movement of the needle cylinder in the direction of the arrow FA, but by activating only the needles of the arc A and cutting the thread in the ends of the partial courses that are progressively formed in this way. In any case this toe fabric T is formed by making a free initial TI edge and then the T fabric, which contains the "chains" T-C of increased and decreased stitch courses to produce the toe bag. The initial free Ti edge of the fabric extends during the manufacture of the T fabric of the bag - between the 3X and 3Y extreme needles of the A-arc of working needles that form the T fabric of the bag (Figures from 6 to 13) . During the formation of the T-tissue, the needles of the arch B opposite the arc A remain low, and they connect the stitches of the initial courses of the "chain". Once the tissue T of the toe bag has been completed, sufficient to form the article, the free initial TI edge must be moved in some way on the needles of the bow B to allow it to be coupled by the needles.; this is the operation performed by the mechanism that has been described, and whose operation will now be explained. During normal operation, and from here also during the production of the toe bag, the platens 9 move between the positions indicated in Figures 2 and 3, and the production of the toe is effected as shown in Figure 6 and in Figure 10. After sufficient tissue T is created to create the toe (and also sufficient to make it possible to bring the initial edge TI over the needle circle in the area of the bow B of needles, which have not been active during the formation of the tissue bag T), the edge 10 is transferred to a position where it can be coupled by the needles of the bow B mentioned above, in such a way that the toe closes on the needles of the bow B. The first stage of the Close is indicated in Figures 7 and 11. Then there is a continuous rotation in the direction of arrow fA. The valve 26 moves to close the main suction pipe 13, 13A, while leaving the opening 22 open, such that there is free air access only to the concentrated suction region of air through the suction opening. elongated and curve 22 and into the tube 24. the end portion of the free edge iT initial, which is adjacent to needle 3X, is pulled during the rotation and forced to pass over the aperture 22 which is active and producing a suction very strong. It is then (Figures 7 and 11) that the first part of the free edge TI is sucked as far as possible along its length, into the opening 22. When the cylinder continues to rotate in the direction fA, the free edge TI starts from the bag T of the toe progressively passes over the total of the opening 22, with the result that progressively enters the latter (Figures 8 and 12). As the cylinder continues to rotate, the needle 3X on which the free edge TI starts reaches and passes over the end 22B of the opening 22 (Figures 1 and 8) so that the tissue T assumes the shape shown in Figure 12, forming a T2 profile. When the needle 3X has passed the position of Figure 12 already reached to that of Figure 13, the plates move radially outwards as in Figure 4, with the result that due to the projections 38, the plates located in the Start of arch B after the 3X needle begins to rise and tilt, as shown in Figure and Figure 5, while needles 1 in arch B are still down. When these plates go up, their pins 40 rise and pass inside the tissue T, perforating it immediately inside the edge TI and around the profile T2 of Figures 12 and 13 formed between the end 22B of the opening 22 of the suction tube 24 and the tissue attachment point to the 3X needle; as the platens 9 continue their radial outward movement indicated by fC, they bring the starting edge TI of the tissue T hooked onto the pins 40, beyond the needle circle as shown in Figure 5, so that the edge TI it is perforated and coupled by the needles of the arc B, which progressively and successively elevate and penetrate the tissue T immediately within the edge TI. This continues until the entire TI edge has been coupled by the needles of the arch B, forming tissue with the wire fed to these needles. The operation described above has thus succeeded in transferring the entire initial TI edge of the toe fabric and hooking it on the needles of the bow B, opposite the arc A of the needles which formed this weave T. The tissue T is stretched on a disc which covers the entire surface of the cylinder. As the continuous circular motion of cylinder 1 continues in the direction of rotation fA, the needles of both arcs A and B, which are now working, form the courses of tubular tissue that accumulate to form the remainder of the stocking or sock . The alternative version shown in Figure 19 uses a type of platen 109 having, like the platen 9, a hole 109A, a surface 109B for its cooperation with the needles and a pin 140 as the tang 40 of the platen 9. The platen 109 does not have the projection 38 of the platen 9, but has a point of contact 138 in an intermediate position along its inner surface, such that this platen can rotate like an oscillator; when it is actuated by the cams of the ring operating the plates acting in the directions of the two arrows fK and fH in Figure 19, the plate moves outwards and its outermost end is lowered, thus causing the spike 140 emerge for an operation similar to that already described for spike 40.

Suitable components - such as cams or the like - will be provided to lower the platens 9 or 109 back when they are moved back towards the needle barrel shafts. It is possible to provide a suitable impeller component 54 (Figure 5) that can be actuated to prevent tissue from arising by needles passing through it, such as the needle 1S shown in Figure 5, in such a way that A smooth coupling is achieved by the needles of the bow B, which must penetrate and hook on the edge TI of the T-fabric of the toe before the tubular work begins. Figure 20 shows an alternative to the version shown in Figures 1, 3, 4, 5 for the use of the platens 9 (see also Figure 18) without a modification to the needle cylinder, this is without resorting to the walls 36 that project inwards. In this variant, the suction tube 13 has its upper funnel-shaped hole 13A extended to form an edge 13F to cover the interior parts of the plates 9 and hence also the pins 40. When the plate 9 moves outwards and is raised (by the presence of the projection 38), the tang 40 rises immediately beyond the projection 13F and abuts the tissue T on the free initial TI edge. It will be understood that the drawings show only an illustrative embodiment, given purely by way of a practical demonstration of the invention, it being possible for the invention to be varied with respect to the forms and assemblies, without thereby departing from the scope of the fundamental concept of the invention. .

Claims (12)

1. A method for closing the toe of a stocking or sock on a circular machine, comprising the optional formation of a series of stitches at the beginning of the article, the formation of the fabric for the toe bag by the needles of a first. approximately semicircular arc, and the transfer of the initial free edge of the bag to the needles of the opposite arch for the coupling of the initial edge on the needles of the opposite arch, to thus initiate the tubular tissue, the method is characterized in that a concentrated suction region of air is created around the inner side of a portion of the circle of needles to capture the free edge of the bag in transit; and other means are activated to move the free edge progressively outward beyond the circle of needles.

2. The method according to claim 1, characterized in that the. other means are activated around the end of the concentrated suction region.

3. The method according to claim 1 or 2, characterized in that rotating platens are activated radially to couple the initial edge, and move it radially outwards beyond the circle of needles.

4. The method according to at least claim 1, characterized in that it comprises a pneumatic system for tensioning the fabric of the toe bag during its formation, in which the suction for the tension is changed to the concentrated suction region of air around the inner side of a portion of the circle of needles.

5. A mechanism for closing the toe of a stocking or sock on a circular machine, characterized in that it comprises means for controlling the needles of a first approximately semicircular arc of needles, to form the fabric for the bag of the toe, and means for transferring the free edge of the tissue for the bag from the toe to the needles of a second needle arch opposite the first needle arch for the needle. coupling of the initial edge on the needles of the second arc in two stages, a first stage in which the second arc of needles approaches, and a second stage in which the initial free edge moves progressively outwards beyond the circle of needles; the mechanism comprises - for driving the first stage - means for forming a concentrated suction region of air in a fixed position around the inner side of a portion of the needle circle.

6. The mechanism according to claim 5, characterized in that to form the concentrated suction region of air, an elongated curved suction orifice is provided at the end of a suction tube controlled by the activation of a valve or equivalent means.

7. The mechanism according to claim 6, characterized in that it comprises a pneumatic suction system, for tensioning the article during its formation, with a funnel-shaped entry hole inside the needle cylinder on the end of a suction tube. fixed that extends to the inner side of the needle cylinder, in that mechanism the elongated suction hole is combined with the funnel-shaped inlet hole and with the fixed suction tube, and a valve capable of closing the tube is provided fixed, to effect a concentration of the suction current inside the elongated suction mouth.

8. The mechanism according to at least claim 5, characterized in that it comprises a tensioning system of pneumatic section type with a funnel-shaped inlet orifice inside the needle cylinder, and that it comprises a flat component - which can be elastically flexed - able to be moved to cover the inlet hole with the exception of a slot defined by a cutout on the edge of the flat component, the slot forming the concentrated air suction region.

9. The mechanism in accordance with at least one of the claims from 5 onwards, characterized in that it comprises - for the actuation of the second stage to progressively move the initial free edge of the fabric of the bag outwards beyond the circle of needles - platinums that can be raised located in the second arch of needles complementary to the first arc of needles, each of the plates is provided with a spike pointing towards the tissue, and is not only radially movable, but can also be raised from its guide graduation point, so that the spike projects outwardly during a supplementary centrifugal movement in which the spike penetrates the tissue on the initial free edge of the toe bag, and thus moves the tissue until it reaches above and just outside the circle of needles.

10. The mechanism according to claim 9, characterized in that each of the plates that can be raised has a downward projection on its inner end, which is driven by the bottom formed part of the graduation point of its plate, so that the stage is raised by its extra centrifugal movement.

11. The mechanism according to claim 9, characterized in that each of the movable plates can be inclined at its graduation point and is lowered at its outermost end at the start or immediately before its supplementary centrifugal movement.

12. The mechanism according to at least one of claims 9-11, characterized in that the funnel-shaped orifice of the suction tube has on its end a projection extending over the plates and their pins, and up to the line to which the ears are removed, and in which they rise.