Classifications

• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
  • D04B1/22—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting goods of particular configuration
  • D04B1/24—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting goods of particular configuration wearing apparel
  • D04B1/26—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting goods of particular configuration wearing apparel stockings
• • 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
  • D04B15/02—Loop-transfer points
• • 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

Definitions

• W02004035894 there is arranged coaxially to the needle cylinder a pick-up member of the tubular knitted article, provided with axial pick-up elements or tubes that are aligned with the needles of the cylinder. In this way, each needle loop of the last course is transferred onto a respective pick-up element.
• a method for producing tubular knitted articles on a circular knitting machine comprising a needle cylinder with a circular needle bed.
• the method initially comprises a step of knitting on the needle cylinder a tubular knitted article starting from an edge and terminating with an open toe. After knitting of the article has been completed, and after moving away any dial that coacted with the needle cylinder to knit the article, the method provides for the step of arranging coaxially to the needle cylinder a pick-up member, provided with a plurality of pick-up hooks arranged according to a circular ring about an axis of the pick-up member.
• each latch portion is constrained to the shank and to the hook portion of the pick-up hook so as to participate integrally with the movement in radial direction of the hook portion toward and away from the axis of the pick-up member.
• the latch portion is movable with respect to the hook portion with a movement substantially parallel to the longitudinal axis of the shank of the pick-up hook, so as to be able to move, alternatively, to an open and closed position. In the first open position, the head of the latch portion leaves the hook portion free so that it can engage the tubular knitted article with a radial movement toward the axis of the pick-up member.
• a machine provided with sewing or linking needles, to close two opposite loop edges of a toe of the tubular article.
• a pick-up hook is provided angularly on the pick-up member every two needles of the circular machine, and the pick-up hooks have a front section with cross dimensions greater than the distance between adjacent needles.
• the pick-up hooks penetrate between pairs of alternate needles, increasing the distance between pairs of needles between which the pick-up hooks penetrate and reducing the distance between pairs of needles between which the pick-up hooks do not penetrate. In this way the step of closing the toe is implemented with fine gauge sewing/linking and with double pitch.
• Fig. 8 schematically shows the step of picking up after rotation of the pick-up hooks about the respective rotation axes
• Figs. 8B and 8C show, respectively in a sectional and plan view, the position of the pick-up hooks before the step of penetration into the courses of the tubular knitted article;
• Fig. 9 shows a step of unloading the loops from the needles after closing the pick up hooks
• Fig. 14D shows a sectional view of the step of closing the toe with elongation of the loops by the hooks
• Fig. 15A shows an enlargement of a portion of Fig. 15 which better illustrates opening of the latch of a half-ring to release the loop;
• Figs. 20, 20A, 20B schematically show, in a side elevation view, in a longitudinal section view according to the arrows XXA and in an exploded view, a possible variant of embodiment of a pick-up hook according to the invention
• Figs. 22, 22A schematically show, in a side elevation view and in a cross sectional view according to the arrows XXIIA, a further possible variant of embodiment of a pick-up hook according to the invention
• Figs. 25, 25A, 25B, 25C schematically show, in a side elevation view, in a cut view of the hook portion alone, in a sectional view according to the arrows XXVB and in an exploded view, a possible variant of embodiment of a pick-up hook, according to the variant of Figs. 23 and 24. Description of some embodiments
• the machine 200 carries out a knitting process of the tubular article 10 starting from the formation of the edge 20, normally using an elastic yam, and ending with the formation of the last course 30.
• the pick-up member 300 is rotated about the axis 301 and taken to a position coaxial to the needle cylinder 220 and to the tubular knitted article 10. This movement is made possible by means of rotation (arrow 304) of the whole pick-up device 318 about the axis 301 until the pick-up member 300 is taken to a coaxial position over the needle cylinder 220, inside the space left free by the dial 250, previously raised.
• the pick-up member 300 comprises a circular support 310 divided into two half supports, which form two circular half-rings 310a, 310b of pick-up hooks 100.
• the two circular half-rings 310a, 310b can be overturned one onto the other about a pivot 305.
• the two half-rings 310a, 310b when arranged approximately coplanar to form the circular support, are concentric with respect to an axis 315 of the pick-up member 300.
• the pivot 305 defines a tipping axis substantially orthogonal to the axis 315 of the pick up member 300, about which axis the pick-up hooks 100, visible in the enlargement of Fig. 5 A, are distributed.
• Each pick-up hook 100 is constrained, by means of a fixing portion 104, to a corresponding connection member 308 with which each pick-up hook 100 is fixed to the pick-up member 300.
• the constraint between pick-up hook 100 and pick-up member 300 is such as to allow each pick-up hook 100 to rotate with respect to a rotation axis 302 (see Fig. 8A, in particular) oriented substantially at 90° with respect to the axis 315 of the pick-up member 300.
• the rotation axis of the pick-up hook 100 of Fig. 5A is substantially orthogonal to the plane of Fig. 5A.
• Each pick-up hook 100 has its own horizontal rotation axis 302, different from the axes of the other pick-up hooks 100.
• Said rotation axes 302 are formed by straight lines tangent to a circumference coaxial to the pick-up member 300.
• each pick-up hook 100 and the respective circular half- ring 310a, 310b can be obtained in a manner known, from W02017067801, for instance.
• Figs. 5B and 5C show the implementation details of an embodiment.
• grooves 311 are provided along radial planes, i.e., planes containing the axis 315 of the pick-up member 300.
• Each circular half-ring 310a, 310b is provided with a semi-annular recess 312 (Fig. 5B) which extends about the axis 315 of the pick-up member 300.
• the position of the above-mentioned grooves in relation to the axis 315 are those taken when the circular half-rings 310a, 310b are positioned coplanar (Figs. 4 and 5). Assembly of the pick-up hooks 100 takes place by inserting a wire or coil spring with a circular section (indicated with 308 in Fig. 5C) into the recess 312 and then coupling each pick-up hook 100 with its fixing portions 104 to the wire or coil spring 308.
• the pick-up hook 100 further comprises a latch portion 105 having a stem 106 constrained through a prismatic pair, i.e., a sliding pair to the shank 101 so as to be able to slide with respect thereto along the longitudinal axis 102, i.e., parallel to the longitudinal axis 102.
• the latch portion 105 can have at one end a tail or butt 107 and at the opposite end a head 108 located on the same side as the hook portion 103 and configured to close the hook portion 103 so as to block loop portions on the pick-up hook 100, as described below.
• the tail or butt 107 can be arranged in an intermediate position along the longitudinal extension of the stem 106 and have a shape different than the one shown in Figs. 6-6D.
• the latch portion 105 is pushed by an actuator 340 (Fig. 9A), which is mounted on the pick-up member 300, in the direction indicated by the arrow 336, so that the shank 106 of the latch portion 105 slides parallel to the axis 102 (see also Fig. 6B). In this way, the head 108 of each latch portion 105 closes the hook portion 103, trapping therein the loop portion 32 that was engaged thereby (Fig. 9A).
• the sliding movement of the latch portion 105 along the axis 102 of the pick-up hook is controlled by the actuator 340 acting on the butt 107.
• the pick-up hooks 100 can have been opened in the previous step, before closing of the two opposite half-rings 310a, 310b of pick-up hooks 100, or can be closed after closing of the two half-rings, according to two possible alternative variants of embodiment.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Sewing Machines And Sewing (AREA)
• Knitting Machines (AREA)
• Treatment Of Fiber Materials (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=67262932

Family Applications (1)

Country Status (5)

Citations (5)

Family Cites Families (6)

• 2019
  • 2019-04-11 IT IT102019000005636A patent/IT201900005636A1/it unknown
• 2020
  • 2020-03-18 TW TW109108991A patent/TW202041736A/zh unknown
  • 2020-03-20 WO PCT/IB2020/052639 patent/WO2020208447A1/en unknown
  • 2020-03-20 CN CN202080035924.9A patent/CN113825868B/zh active Active
  • 2020-03-20 EP EP20719717.9A patent/EP3953513B1/en active Active

Patent Citations (5)

Also Published As

Similar Documents

Legal Events