Classifications

• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B9/00—Circular knitting machines with independently-movable needles
  • D04B9/40—Circular knitting machines with independently-movable needles with provision for transfer of knitted goods from one machine to another
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B9/00—Circular knitting machines with independently-movable needles
  • D04B9/42—Circular knitting machines with independently-movable needles specially adapted for producing goods of particular configuration
  • D04B9/46—Circular knitting machines with independently-movable needles specially adapted for producing goods of particular configuration stockings, or portions thereof
  • D04B9/56—Circular knitting machines with independently-movable needles specially adapted for producing goods of particular configuration stockings, or portions thereof heel or toe portions
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
  • D04B15/88—Take-up or draw-off devices for knitting products
  • D04B15/92—Take-up or draw-off devices for knitting products pneumatic
• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B23/00—Sewing apparatus or machines not otherwise provided for
  • D05B23/007—Sewing units for assembling parts of knitted panties or closing the stocking toe part
  • D05B23/009—Toe closers

Definitions

• WO-A-00/011869 describes a device and a procedure for closing the toe of a tubular article by sewing which consists in arranging a sewing machine under. the needle cylinder of the knitting machine.
• the tubular article is gripped by retaining means before being fully released from the needles of the knitting machine and transferred to the sewing machine underneath by means of an intermediate system for turning it inside out. After being sewn, the article is turned inside out again and removed from the machine.
• This device and this method present the problem of once again requiring an internal modification of the knitting machien in order to be implemented. Such an intervention is not always possible and implementation depends, among other things, on the dimensions of the machine members and the available space under the needle cylinder, as well as the longitudinal dimension of the articles to be made.
• EP-A-1118700 describes a device with a system for extracting the article from the knitting machine by means of a tubular guide which is inserted coaxially with respect to the needle cylinder inside and around which the tubular article is formed. The extracted article is then transferred to a system for closing the toe external to the knitting machine and arranged, for example, by the side of it.
• This system has the advantage, with respect to the preivous one, of being more easily implemented in knitting machine of the existing type.
• this solution also presents limitations. This is because a considerable axial dimension of the knitting machine is required for implementing the adaptation.
• Object of the invention is to make a device which can be easily applied to a traditional knitting machine and which can be used to close the toe of the tubular articles made by the knitting machine outside the machine itself.
• An additional object of the invention is to provide a new method for the production of tubular knitted articles whose toe is closed automatically at the end of the knitting process without the need for complex handling or labor.
• the invention relates to a device for closing the toe of a tubular knitted article coming from the knitting machine where it is made, comprising the following combination:
• positioning members for positioning said article on said first and second tubular member which is positioned in said first station, the positioning members comprising opening means for opening the article coming from the pneumatic transfer tube;
• a pneumatic conduit for unloading the article after closing the toe which can at least in part be the same tube used to transfer the article prior to sewing.
• a device of this kind can be easily interfaced with a single knitting machine or several machines by means of the pneumatic transfer tube.
• the articles are thus unloaded from the machine according to traditional methods with the toe open and without the need for inserting any sort of collection device, apparatus or mechanism inside the machine other than a simple pneumatic transfer tube or conduit.
• the product received from the machine is then positioned, turned inside out, sewn or linked, or another operation is made for closing the toe, turned inside out again and finally unloaded following machining in two separate stations.
• the article is then transferred from one station to the other by means of a system consisting of two mobile tubular members.
• the tubular member support can turn (intermittently always in the same direction or alternatingly) on an axis for positioning the first and the second tubular member alternatively in the first and the second station.
• the two tubular members can be arranged either reciprocally parallel or slanted. Preferably, they are reciprocally parallel and parallel to the axis of rotation and oscillation of the respective support although other configurations are possible.
• the tubular article from the knitting machine can be presented to the tubular member which is in the first station on the end of the member corresponding to the position where the toe is positioned and closed.
• the article is supplied to the tubular member from the opposite side.
• the outlet of the pneumatic transfer tube in this case faces towards the inside of the tubular member which is temporarily in the first station.
• the article is sucked by suitable suction, leaves the pneumatic transfer tube and enters inside the tubular member where it is stopped near the opposite end to the end through which it entered. Opening and positioning means are found in this position, comprising the means of turning inside out and positioning the edges to be sewn.
• An arrangement of this kind results in a structure which is very simple, cost-effective and reliable, with a reduced number of parts, capable of reducing handling times of the article.
• the latter penetrates in the tubular member with the edge opposite to the toe to be closed first, i.e. with the toe facing upstream with respect to the advancement movement of the article along the pneumatic transfer tube and along the tubular member.
• the opening means comprise gripping means (e.g. preferably pneumatic means) to grip the end of said article opposite to toe to be closed, i.e. in the case of an article in the form a sock, the elastic edge of the article.
• the gripping means open the elastic edge and turn it inside out on the outer surface of the tubular member.
• a method for the production of a tubular knitted article with a closed toe can be implemented using a device of the type herein described, the method comprising the following phases:
• the end of the tubular article opposite to said toe is opened in the first station and the article is turned inside out.
• a first article is fitted and positioned on said first or second tubular member which is temporarily in said first station;
• the article after closing the toe, the article can be turned inside out again from outside to inside said tubular member and removed by suction through said tubular member in the first or second station.
• the method comprises the following phases: a) arranging a first tubular member in said first station; b) introducing a first article in said first tubular member; c) turning said first article inside out on the outer surface of said first tubular member; d) transferring said first tubular member to said second station and arranging a second tubular member in said first station; e) closing the toe of the first article while a second article is introduced in the second tubular member which is temporarily in said first station and turning it inside out on the outer surface of the tubular member; f) transferring the second tubular member to the second station and the first tubular member to the first station; g) turning the first article inside out again inserting it in the first tubular member and distancing said first tubular article by sucking it into said first tubular member
• the device and method according to the invention will be described in the context of an embodiment implementing particularly innovative means for orienting, positioning and opening the single articles. However, it is understood that the invention can be implemented with other orientation, positioning and opening means.
• FIG. 1 is a perspective view of the device for turning inside out, transferring and closing a tubular article
• FIG. 1 shows a perspective view of a knitting machine equipped with the device shown in figures 1 and 2;
• FIG. 5 shows an isolated perspective view of the means for guiding and orienting the article which is supplied to the device to be opened, turned inside out and closed in the toe area,
• - figures 9A and 9B show two possible positions in which the tubular article can be arranged when it arrives at the end of the tubular member on which it must be turned inside out before the toe i& closed at a later stage
• - figures from 10 to 13 show four subsequent phases of the opening operation involving the elastic edge of the tubular article in a cross-section which is orthogonal to the axis of the tubular member
• FIG. 19 and 20 are longitudinal cross-sections showing two successive phases of the tubular article reversing operation on the outer surface of the tubular member
• the device 1 presents a support 3 which carries two reciprocally parallel tubular members 5A, 5B.
• the support 3 turns on an axis A-A which is parallel to the axis of the two tubular members 5A, 5B.
• the rotary movement of the support 3 is controlled by an actuator 7 arranged above and carried by a fixed frame 9.
• the rotary movement can be proceeded by an upwards movement of the support and consequently of the tubular members which are applied to it to avoid the collision (during rotation) with the mechanical parts surrounding the lower end of the two tubular members.
• the support 3 turns by 180° on the axis A-A and the two tubular members 5A, 5B are alternatively positioned in two stations side by side.
• the movement can be either an alternating movement or an intermittent rotary movement without reversing the direction of rotation.
• Opening means are arranged in the first station where the tubular member 5A is located in figures 1A, 1 B.
• the opening means comprise gripping members and opening means for holding the elastic edge of each article which is supplied into the tubular member in the first station and to open the elastic edge on the outer surface of the tubular member itself. Additionally, means for reversing the tubular article on the outer surface of the tubular member are provided.
• the union of these positioning members is generically indicated by reference numeral 11 in figure 1 , while a part of these members has been removed in figure 1 A for greater clarity.
• Angular orienting means and tensioning means are arranged in the second station, said means being generically indicated by reference numeral 13, to pull the toe of the tubular article to be closed and closing means 15, specifically a sewing machine, for closing the toe of the article by sewing or other operation (e.g. linking).
• the tubular articles made by the knitting machine 2 are supplied to the device 1 via a pneumatic transfer tube 17 presenting a terminal curve 17A arranged at an angle of 90° and facing one first end of the tubular member 5A, 5B which is temporarily in the first station, i.e. the tubular member 5A in the position shown in figures 1 , 1A, 2.
• the pneumatic transfer tube 17 is connected to a conduit 19 leading from the lower part of the needle cylinder of the knitting machine 2.
• Interception means genetically indicated by reference numeral 21 , are arranged between the tube 17 and the conduit 19.
• the suction required for collecting the article made by the machine 2 and discharged from the needles is generated, as described below, through the tubular member 5A or 5B which is temporarily in the first station holding the interception members 21 open.
• the tubular article after being closed by the sewing machine 15 in the second station is transferred again to the first station and sucked to be removed via a pneumatic unloading conduit 23.
• the conduit 23 is connected to the pneumatic transfer tube 17 and to a fitting 25 which is in turn connected to a suction device (not shown).
• the article is aspirated from inside the tubular member 5A or 5B in which it is reinserted after closing the toe and transits along the tube 17 and along the conduit 23 to reach a box 27 where it is unloaded in a way which is known per se.
• the interception means 21 are closed. After unloading the finished article, a new article is aspirated through the conduit 19 and the transfer tube 17.
• the device described to this point works as follows. A first article made by the machine 2 is sucked via the conduit 19 and the transfer tube 17 to reach the tubular member 5A. Since the article is made by the machine 2 starting from the elastic edge and ending with the toe, it reaches the tubular member 5A with the elastic edge first and the toe behind, i.e. downstream with respect to the direction of advancement. Having reached the lower end of the tubular member 5A, the article is turned inside out on the outer surface of the tubular member 5A by the members generically indicated with reference numeral 11 and described in greater detail below.
• the support 3 After being positioned, the support 3 is turned by 180° and the position of the tubular members 5A, 5B is turned inside out, so that the tubular member 5A is in the second station while the tubular member 5B is taken to the first station.
• the toe of the article is pulled and sewn according to a method which is essentially similar to that described in EP-A-1118700 or the like.
• the support 3 After closing the toe of the first article in the second station and positioning the second article in the first station, the support 3 turns again by 180° to return the tubular members 5A, 5B in the configuration shown in figure 1. The first article is sucked and unloaded along the tube 17 and the conduit 23 to permit the introduction of the next article while the toe of the second article is closed in the second station.
• the article can be turned inside out the second time after closing the toe in the first or second station both being equipped with means for performing the operation as illustrated below.
• the device 1 is capable of performing the toe closing operations by working on two articles at the same time in the two stations between which the articles are transferred by mechanism 3, 5A, 5B. In this way, the operations needed to close the two overlap. Consequently, the total time required to close the toe is reduced and the device 1 can close all articles from the knitting machine 2 to which it is combined.
• FIGS. 3 to 7 show in detail the members for opening and turning inside out the tubular articles which are individually supplied by the pneumatic transfer tube 17 inside either one or the other tubular member 5A, 5B.
• the assembly of the members 11 is carried by an annular structure 31 which is coaxial with the tubular member 5A or 5B temporarily located in the first station.
• the annular structure 31 is carried by a slide 33 (figure 1 , 1A) moving on a vertical guide 36 parallel to the axis of the tubular members 5A, 5B.
• the annular structure carries a plurality of radially movable pressers 35, each of which is associated with a respective actuator 37 (see figure 4 in particular). As better described below, the pressers 35 turn the tubular article inside out on the outer surface of the tubular member 5A or 5B and other auxiliary functions.
• the annular structure 31 carries four linear actuators 39, e.g.
• Each gripping member presents a sucking head 47 applied to a first end of a tube 49 whose second end is connected by means of a flexible tube to a suction line.
• the flexible tubes and the suction line are not shown for the sake of simplicity of the drawing.
• a respective stem 51 (see figures 6A and 6B in detail) is associated to each gripping member 45A, 45B.
• the stems form opening means for opening the edge of the tubular article opposite to the toe of the article which must be closed.
• Each stem is carried by a slide 53 moving on a guide 55 which is integral with a respective slider 41.
• Each slide 53 is secured by a traction spring 57 to an appendix 59 which is integral with the respective slider 41 so that the four stems 51 are elastically stressed towards the axis of the annular structure 31 and of the tubular member 5A and 5B for the purposes which will be illustrated below.
• a mobile unit 31 is arranged under the annular structure.
• the mobile unit comprises the upper end of a suction tube 61 carried by a support 63 vertically movable and controlled by an actuator (schematically referred to by numeral 64) according to the double arrow f63.
• the tube 61 is connected to a suction source by means of a flexible tube (both not shown in the drawing).
• the upper part of the suction tube 61 forms housings for the passage of the gripping members 45A, 45B, indicated by reference numeral 65.
• the suction tube 61 presents an interception member 67 consisting of a grid to stop the sucked tubular articles from penetrating inside the tube.
• the appendixes 71 A, 71 B and 73A, 73B are made on the suction tube 61 between the four housings 65.
• the appendixes 71 A and 73A are reciprocally symmetric.
• the appendixes 71 B, 73B are also reciprocally symmetrical.
• Reciprocally symmetric contoured appendixes 71 C, 73C are provided inside each of the tubular members 5A, 5B and shown isolated from the respective tubular member in figure 5.
• the shape of the contoured appendixes 71.C, 73C is complementary with respect to the contoured appendixes 71 A, 71 B, 73A, 73B and integral with the suction tube 61 so that the appendix 71 C is inserted between the appendixes 71 A, 71 B forming a contoured body which shape is symmetrical with respect to that formed by the appendixes 73A, 73B, 73C when the latter are inserted between the appendixes 73A, 73B.
• the two symmetric contoured bodies are generically indicated by reference numerals 71 and 73 in figures 6A and 6B where they are shown as if they were made of a single part and where the respective tubular member 5A, 5B has been removed to clearly show the shape of the contoured bodies.
• the suction tube 61 is mobile in the direction of the double arrow f63 with respect to the tubular member 5A or 5B which is temporarily in the first station of the device 1 allowing the opening of the tubular article by the gripping members 45A, 45B, as clearly described below.
• the contoured bodies 71 , 73 formed by coupling the appendixes 71 A, 71 B, 71 C and 73A, 73B, 73C form means for guiding and orienting the tubular article which reaches the lower end of the tubular members 5A or 5B.
• the contoured bodies 71 and 73 present three main variously contoured surfaces.
• Each body presents a first cylindrical surface, indicated by reference S 71 and S 73 , reciprocally, corresponding to the internal cylindrical surface of the tubular member 5A or 5B.
• each body presents a orienting and guiding surface indicated by reference X 71 and X 73 .
• FIG. 7A is a perspective view of the two contoured bodies 71 , 73 and figures from 7B to 7F are cross-sections according to planes which are orthogonal to the axis of the tubular member 5A or 5B in the positions indicated by references B, C, D, E, F in figure 7A.
• reference M indicates the tubular article illustrating a transversal cross-section of the elastic edge of the article itself.
• the article M is shown with the elastic edge folded in four and orthogonally oriented with respect to the surfaces Y 71 , Y 73 .
• This is one of the possible configurations in which the article can arrive from the pneumatic transfer tube 17.
• the article M will always arrive approximately folded in this way, but with any angular orientation on the axis of the tubular member.
• FIG. 8A shows the upper end of one of the tubular members 5A, 5B
• the latter each consists of two coaxial tubular elements, internal and external reciprocally, identified by references 5X and 5Y in figure 8A.
• the tubular element 5X can slide for a short distance inside the tubular element 5Y which is directly supported by support 3.
• a helical compression spring 6 housed in a gap between the two tubular elements 5X, 5Y tends to stress the internal tubular element 5X upwards, i.e. to project from the top of the tubular element 5Y.
• the collar 17D rests on a corresponding collar 5Z, which is integral with the internal tubular element 5X of the tubular member 5A or 5B, which is temporarily in the first station by pushing the tubular element 5X downwards.
• the relative telescopic sliding function of the tubular elements 5X, 5Y will be clarified in the paragraphs describing the method for turning the tubular article inside out.
• the opening movement of the gripping members 45B controlled by the respective actuators 39 thus opens the tubular article M which assumes the position shown in figure 11 in the area projecting from the lower inlet of the tubular member 5A. Subsequently, the gripping members 45A are reciprocally approached and pressed against the edge of the tubular article M in the area comprised between the two gripping members 45B, as shown in figure 12. After pressing the tubular article M between the two front surfaces of the gripping article 45A, the latter are activated by creating inside a suction so that the tubular article is engaged by the members. The following opening movement of the gripping members 45A causes the complete opening of the article M which assumes the position shown in figure 13.
• the four stems 51 (of which only two appear in the cross-section view) are in such a widely open position that the edge MB of the article M is arranged clear of the inlet of the tubular member 5A. It is not ruled out that the opening operations be carried out by different means, e.g. by a single set of gripping means also of the mechanical type. However, the arrangement herein described is particularly reliable because it avoids accidentally damaging the fabric which forms the article.
• edge MP intended to form the closed toe is taken onto the outer surface of the tubular member 5A, i.e. when the article M has been completely turned inside out and is on the outer surface of the tubular member, a sequence consisting in raising, turning by 180° and lowering the support 3 carrying the tubular member 5A to the second station for closing the toe is performed.
• the edge MP may need to be aligned and taken parallel to the inlet edge of the tubular member 5A. This operation can be performed in the first or the second station and is illustrated in figures from 21 A to 21 D.
• the article M is entirely turned inside out on the outer surface of the tubular member 5A and the edge MP intended to form the closed toe is arranged in a casual, irregular retracted position with respect to the terminal edge of the tubular member 5A.
• the radial pressers 35 are arranged in correspondence with the terminal area of the tubular member under the edge MP and approached to the external surface of the tubular member. They are then lifted to meet the edge MP and make the edge slide upwards for a distance which is sufficient to ensure that the edge MP is resting on all pressers 35 (figure 21 B). In this way, the edge MP is approximately aligned on an ideal circumference which is on top tangent the radial pressers 35.
• the pressers 35 are opened and additionally moved upwards to a height which is immediately over the edge MP (figure 21 C) and closed to press on the tubular article M.
• the closed pressers are lowered to align the edge MP with the lower terminal edge of the tubular member 5A in the configuration of figure 21 D.
• the process can be controlled, for example by means of optical sensors (not shown).
• the edge MP is aligned on a plane which is orthogonal with the axis of the tubular member and which contains the lower edge of the tubular member 5A.
• the procedure for aligning the edge MP could be carried out in the second station with similar radial pressers which are provided in said station for other functions as illustrated below.
• Figure 22 shows a longitudinal cross-section of the tubular member 5A after the operation consisting in turning the article inside out and aligning the edge MP of the article before rotating the support 3 by 180° which transfers the tubular member 5A to the second station.
• An annular structure 81 which is similar to structure 31 is arranged in the second station and carried by a slide 83 moving on a vertical guide 85 (see figures 1 and 2).
• the annular structure 81 presents radial pressers 87 which are operated by actuators 89, similar to the radial pressers 35 and the respective actuators 37.
• the annular structure 81 with the radial pressers which are fitted on it is angularly mobile on its axis coinciding with the axis of the tubular member 5A or 5B temporarily located in the second station.
• the angular movement is provided by an actuator 90 (figures 1-2).
• the edge MP of the tubular article can be positioned angularly with respect to the tubular member 5A to take the two edges to be joined to form the closed toe and align them with two slots or grooves 5D diametrically opposed along the terminal area of the external tubular element 5Y from the edge of the latter and visible in particular in figure 25.
• the tubular member 5A is angularly fixed with respect to the support 3 or if its angular position is known, the angular position of the slots 5D is known beforehand.
• a photocell or other optical sensor 91 shown in figure 25 can be used to identify the correct angular position of the tubular article M, e.g.
• brackets 13A can be opened (figure 26) projecting outwards radially from the tubular member 5A through the diametrically opposite slots 5D to tension the edge MP of the article, as shown in figure 26.
• a subsequent downwards movement of the brackets 13A carries the tensioned edge under the lower edge of the tubular member into an area in which it is sewn by sewing machine 15 or other suitable means, equipped for example with a guillotine in which the fabric of the edge MP penetrates.
• the closing operation is carried out in a way which is known per se and will not be described herein. After closing the toe, the article M can be turned inside out again penetrating inside the tubular member 5A and removed.
• the remaining operations on the other hand can be carried out in either one or the other of the two stations and distributed according to the need or choice of the operator, always considering the need to minimize the total time needed to close the toe.
• the angular orientation of the article can be carried out in the first station in which case the annular structure 31 will be angularly mobile.
• Alignment of the edge MP can in principle be carried out by means of the radial pressers 87 in the second station.
• the second operation consisting in turning the article inside out and unloading it could be carried out in the second station.
• Figures 29 and 30 show a different embodiment of the device according to two cross-sectional views which are similar to the cross-sectional views shown in figures 6A and 6B.
• the same reference numbers indicate parts which are the same or correspond to those in figure 6A, 6B.
• This second embodiment differs from the previous one for the different configuration of the guiding and orienting means upwards with respect to the gripping means.
• the terminal portion (lower) of the tubular members 5A, 5B consists of an internal frusto-conical surface 101 which guides the elastic edge MB of the tubular article towards four cylindrical surfaces 103 which are arranged in correspondence with the gripping members 45A, 45B.
• the edge of the tubular article is tightened on the axis of the other tubular member and is gripped by the gripping means.
• the solution is less advantageous than the previous one because the position in which the tubular article is arranged is not determined and several repeated movements of the gripping members 45A, 45B may be needed for opening it.
• the second embodiment differs from the previous one also because in the first embodiment a collar 8 is provided to reduce the cross-section of the tubular member 5A, 5B.
• the collar presents a contoured lead-in cross-section to facilitate the passage of the tubular article. This prevents the article from colliding into the contoured bodies 71 , 73, and by restricting the incoming product, arranges it for the subsequent orientation.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Treatment Of Fiber Materials (AREA)
• Sewing Machines And Sewing (AREA)
• Knitting Machines (AREA)
• Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=11442269

Family Applications (1)

Country Status (11)

Families Citing this family (23)

Family Cites Families (7)

• 2001
  • 2001-08-28 IT IT2001FI000164A patent/ITFI20010164A1/it unknown
• 2002
  • 2002-08-19 CZ CZ2004289A patent/CZ2004289A3/cs unknown
  • 2002-08-19 WO PCT/IT2002/000541 patent/WO2003018891A1/en not_active Application Discontinuation
  • 2002-08-19 JP JP2003523729A patent/JP2005501186A/ja active Pending
  • 2002-08-19 CN CNA028192605A patent/CN1561416A/zh active Pending
  • 2002-08-19 KR KR10-2004-7002872A patent/KR20040035740A/ko not_active Withdrawn
  • 2002-08-19 CA CA002458633A patent/CA2458633A1/en not_active Abandoned
  • 2002-08-19 EP EP02775205A patent/EP1421231A1/en not_active Withdrawn
  • 2002-08-19 US US10/488,392 patent/US20050115279A1/en not_active Abandoned
  • 2002-08-19 MX MXPA04001823A patent/MXPA04001823A/es unknown
  • 2002-08-19 RU RU2004109138/12A patent/RU2004109138A/ru not_active Application Discontinuation

Non-Patent Citations (1)

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