Classifications

• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B33/00—Devices incorporated in sewing machines for supplying or removing the work
• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B35/00—Work-feeding or -handling elements not otherwise provided for
  • D05B35/02—Work-feeding or -handling elements not otherwise provided for for facilitating seaming; Hem-turning elements; Hemmers
  • D05B35/04—Work-feeding or -handling elements not otherwise provided for for facilitating seaming; Hem-turning elements; Hemmers with movable tools
• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B39/00—Workpiece carriers

Definitions

• the present invention relates to a processing method for folding and subsequently feeding and sewing pockets on respective panels of jeans or similar trousers.
• the method according to the invention involves integrating some of the technologies previously known in the prior art in a single solution, and in particular with the addition of a further workstation with respect to the usual three workstations.
• the present invention is advantageously applied in the field of industrial sewing systems, in particular in that relating to the automatic folding and sewing of pockets or the like with respect to trouser panels or the like .
• a second folding station in which the base fabric is positioned, above a loading plane, and a pocket to be applied. In this station the peripheral edges of the pocket are folded, and the pocket is positioned on a base fabric, so that a double layer of material is thus ready to be loaded.
• a third sewing station in which the folded pocket is applied/sewn onto the base fabric.
• the material already prepared is taken by the loading plate, when this reaches the sewing station, through a system of grippers present in a sewing head.
• the sewing head with the gripper system thereof blocks the material during the entire sewing step.
• the material is taken from the loading plate, which moves from the rest position thereof to the folding station and then to the sewing station.
• the sewing head with the gripper system thereof blocks the material during the sewing.
• a first type which provides that the sewing head is located on one end of the working line, and that the loader is positioned on the opposite side, while the folding assembly is placed in an intermediate position between these ends of the working line, which is thus arranged in a central position with respect to the sewing head and the loader; the loader moves between the three stations present in the unit.
• the first type of automatic unit made according to the known technique is used by performing six consecutive working steps :
• the operator in the folding station starts loading the material to be sewn on the loading plane and in the folding assembly, while the loader with the loading plate thereof is positioned at its rest point next to the folding station;
• the loader moves to the folding station at the end of step 1.2, and the loading plate thereof blocks the material to be loaded;
• the sewing head blocks the material which was just loaded by means of the inner gripper thereof and the loader raises the loading plate;
• the loader begins to return to its rest point with the loading plate raised.
• the sewing head lowers the outer gripper thereof and starts the sewing cycle only when the loader has already removed the entire loading plate from the sewing head.
• the loader returns to the rest point thereof passing through the material loading area.
• the drawbacks encountered by using this first type of automatic assembly can be calculated in terms of time by providing the example where the total preparation/loading cycle has a total duration of 8.5 seconds, which corresponds to the sum of the seconds which elapse from the 1st to the 6th step.
• the second type of automatic unit made according to the known technique is used by performing four consecutive working steps :
• WO 2018/202898 A1 discloses a system for ironing and sewing pockets on a piece of cloth comprising a plate suitable for supporting a pocket to be sewn, an ironing station for ironing the pocket supported by the plate, a loader suitable for taking the pocket to a sewing station, and a moving device connected to the plate in order to move the plate to the ironing station and from the ironing station to a transfer station, where the pocket is transferred from the plate to the loader.
• WO 2019/105070 A1 discloses a multi-head pocket setter machine being capable of sewing a plurality of stitches with different colors on a pocket; the multi-head pocket setter machine comprises a frame and two or more heads spaced apart in a front-rear direction on the frame; each head respectively comprising a needle for sewing a stitch on the pocket, further comprising a first feeding device which is provided between the two or more heads and is used for moving cloth material from a front side head to a rear side head, the first feeding device comprising a first feeding plate slidable relative to the frame in a front-rear direction, the frame having a working surface for carrying the cloth material, the first feeding plate (30) being located above the working surface, the multi head pocket setter machine has a feeding state, and when in the feeding state, the first feeding plate being in a lowest position to drive the cloth material between the first feeding plate and the working surface to move .
• the present invention is intended to provide a processing method for folding and sewing fabric flaps, in particular for folding and sewing pockets on respective panels of jeans or similar trousers, which is able to optimize the working steps, thus creating a condition capable of eliminating the drawbacks highlighted above.
• This object is achieved by using an automatic sewing unit equipped with four workstations.
• the invention aims in particular to combine in a single automatic unit in which the traditional working steps are changed and in particular an intermediate material exchange station is included, maintaining the folding and sewing steps of the pocket on the respective panel on the sides of the kinematic chain, in order to optimize production times.
• the method according to the invention provides for reversing the position of the loading station with respect to the folding station, so that the loading plate is located in an intermediate station and subsequently moving the material from the intermediate station to a material exchange station placed in the vicinity of the sewing head.
• the sewing head is on the opposite side of the folding assembly.
• the gripper system of the sewing head and the loading plate can be moved longitudinally with respect to the working front.
• the grippers of the gripper system move towards a material exchange station, and the same movement is also performed by the loading plate in the intermediate station. Thanks to the intermediate material exchange station, the material is exchanged faster with respect to a normal cycle and this helps reduce loading times and streamline overall working times.
• the main advantage of this new solution consists in the fact that the total production time is now divided between four independent steps, a first step of loading and preparing the material in the folding assembly, a second step of moving the material to an intermediate station waiting for the sewing assembly to be free, a third step of simultaneously moving the material from the intermediate station to the exchange station and the gripper system of the sewing head to reach the exchange station and then a fourth step of moving the material from the exchange station to the sewing station.
• a fourth step involves moving the material from the material exchange station to the sewing head by means of the grippers of the sewing head, the characteristics of which are described in the main claim.
• figure 1 depicts a front perspective view of a four- station folding and sewing unit of fabric flaps according to the invention as a whole;
• figure 2 shows a schematic plan view thereof
• figure 3 is a schematic plan view of the gripper system present in the sewing head, fixed on the support thereof;
• FIGS. 4 to 6 show views of the gripper system forming part of the sewing assembly during three distinct operating steps along the axis parallel to the front of the machine;
• pairs of figures ⁇ - ⁇ ' to 16-16' refer to views of operating steps performed in progressive succession, where each pair of figures is formed by a front anterior view of the machine and a respective plan view of the same machine.
• the number 10 generally refers to a work unit for folding and sewing fabric flaps, in particular for folding and sewing pockets on respective panels of jeans or similar trousers.
• the work unit 10 is provided with a loading plane 11, placed on one side of the machine, adjacent to a sewing plane 12 placed on the other side of the machine, and comprises four operating stations, i.e., in operating order, a folding station 13, an intermediate station 14, a fabric exchange station 15 and a sewing station 16.
• the work unit 10 comprises two forms of fabric retention/feeding which, still in operating order, are the following: a loading and feeding plate 18, a sewing gripper system comprising an outer jig 19.
• a folding assembly 20 is present at the folding station 13 and a sewing assembly 22 is present at the sewing station 16, with a gripper assembly comprising an outer sewing jig 19, in whose central part a window is obtained in which an inner jig 29 is comprised.
• the sewing gripper system with outer jig 19 is placed on a carriage 23 capable of making horizontal movements (right-left) along an axis X parallel to the front of the machine, horizontal movements (forward- backward) along an axis Y on a transverse axis with respect to the axis X parallel to the working front and vertical movements (up-down) along an axis Z orthogonal to the sewing plane.
• the carriage 23 on which the sewing gripper system with outer jig 19 moves is divided into two half-parts 24 and 25, and in particular the half-part 25 is slidable with respect to the half-part 24 by means of an actuator 26, and the half-part 24 is in turn connected posteriorly to a guide 27, arranged horizontally parallel to the axis X, for the horizontal sliding of the sewing gripper system comprising an outer jig 19 according to multiple strokes.
• the loading and feeding plate 18 can make movements along the axis X to bring each base fabric, with the flap of fabric thereof to be sewn, from the folding station 13 to the exchange station 15 in which the sewing gripper system with outer jig 19, in the central part of which a window is obtained in which an inner jig
• 29 is comprised, moves a certain distance towards the loading and feeding plate 18 to pick up the fabric and bring it to the sewing area.
• the material exchange station 15 and the intermediate station 14 are arranged between the sewing station 16 and the folding station 13.
• the loading plate 18 moves into the area of the folding assembly 20 at the end of the second step and blocks the material to be loaded (Fig. 8-8');
• the loading plate 18 moves into the exchange area 15, at the end of the previous sewing cycle when the sewing machine 22 and the sewing gripper system with outer jig 19 placed in the sewing station 16 are free of any material. Then the loading plate 18 remains stopped in the material exchange area 15 and waits for the sewing gripper system with the outer jig 19, in the central part of which a window is obtained in which an inner jig 29 is comprised, to move towards the material exchange station 15 so as to take the material, by means of the action of the actuator 26 (Fig. 10-10' ) .
• the position of the loading plate 18 is moved to a position in which the mechanics thereof with the carriage and the movement belt can move along the axis X, parallel to the front of the machine, the vertical arm 28 and be able to raise the loading plate 18 without any particular interfering with the folding assembly 20 and the gripper system present in the carriage 23 of the sewing head 22.
• the gripping point of the material by the sewing gripper system with the outer jig 19 and inner jig 29 has been modified, which starting from the point of origin of the sewing or rest programs placed in the sewing machine 22 (figure 4) moves beyond the normal rest point or point of origin of the sewing programs, (figure 5) forming a mechanical system on the carriage 23 divided into two half-parts 24 and 25, with the half-part 25 sliding with respect to the part 24 by means of an actuator 26, (figure 6) so that the sewing gripper system with the outer jig 19 and inner jig 29 picks up the material in a nearer area, in the material exchange station 15, instead of in the distant station 13 of the folding assembly 20.
• the main advantage of this new solution is that the total production time is divided into three sequences of movements :
• the first solution belonging to the prior art provides a first fixed preparation step of about 6.5 seconds, there are no wait times, so the loading plate 18 can immediately perform the second loading step of another 2 seconds, therefore a total of 8.5 seconds.
• the first preparation step is fixed at about 7 seconds

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Sewing Machines And Sewing (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=68653516

Family Applications (1)

Country Status (7)

Citations (5)

Family Cites Families (6)

• 2019
  • 2019-07-23 IT IT102019000012684A patent/IT201900012684A1/it unknown
• 2020
  • 2020-07-21 CN CN202080062021.XA patent/CN114364835B/zh active Active
  • 2020-07-21 WO PCT/IB2020/056840 patent/WO2021014352A1/en unknown
  • 2020-07-21 JP JP2022504068A patent/JP7436625B2/ja active Active
  • 2020-07-21 PT PT207395518T patent/PT4004265T/pt unknown
  • 2020-07-21 EP EP20739551.8A patent/EP4004265B1/en active Active
  • 2020-07-21 BR BR112022001142A patent/BR112022001142A2/pt unknown

Patent Citations (5)

Also Published As

Similar Documents

Legal Events