WO2021120641A1 - 起缝剪线机构及其方法 - Google Patents

起缝剪线机构及其方法 Download PDF

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Publication number
WO2021120641A1
WO2021120641A1 PCT/CN2020/107009 CN2020107009W WO2021120641A1 WO 2021120641 A1 WO2021120641 A1 WO 2021120641A1 CN 2020107009 W CN2020107009 W CN 2020107009W WO 2021120641 A1 WO2021120641 A1 WO 2021120641A1
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WO
WIPO (PCT)
Prior art keywords
thread
thread trimming
limit
driving
sewing
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PCT/CN2020/107009
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English (en)
French (fr)
Inventor
万义明
林晓晓
洪志敏
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杰克缝纫机股份有限公司
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Application filed by 杰克缝纫机股份有限公司 filed Critical 杰克缝纫机股份有限公司
Publication of WO2021120641A1 publication Critical patent/WO2021120641A1/zh

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D05B65/06—Devices for severing the needle or lower thread and for disposing of the severed thread end ; Catching or wiping devices for the severed thread

Definitions

  • the present invention relates to the technical field of sewing machine thread trimming structures, in particular to a sewing thread trimming mechanism and a method thereof.
  • the thread trimming structure of the existing sewing machine is a first movable knife 2 and a second movable knife 4 located below the needle plate and above the rotary hook.
  • the second movable knife 4 is driven to rotate around the lower shaft through a driving mechanism.
  • the knife tips of the two movable knives 4 separate the suture thread loop with the suture to swing in a direction opposite to the first movable knife 2, bite and cut the suture under the needle 3 of the sewing machine, and reset under the action of a reset spring.
  • After the thread is trimmed there is a certain length of suture thread left on one side of the needle 3 of the sewing machine to ensure that the sewing will start normally next time.
  • This thread will form bad stitches a few stitches before sewing, commonly known as "Bird's Nest”; the setting of "Bird's Nest” will affect the sewing The quality of the product; when the length of the trimming thread is unstable and the stitch length is small, there is no tension on the thread of the starting seam, and the problem of starting seam falling off will occur.
  • the technical problem to be solved by the present invention is to provide a sewing thread trimming mechanism and method thereof.
  • the present invention provides a sewing thread trimming mechanism, including:
  • a fixed thread trimming knife the end of the thread trimming fixture near the needle of the sewing machine is provided with a fixed knife edge;
  • a thread trimming movable knife the thread trimming movable knife is arranged below the thread trimming fixed knife; the top surface of the thread trimming movable knife is provided with a thread hook groove; the thread trimming movable knife is close to the needle of the sewing machine A movable knife edge is provided on one end; the wire hooking groove is provided with a wire hooking hole, and the wire hooking hole is located on the end of the wire hooking groove away from the movable knife edge;
  • a drive component the drive component is connected with the thread trimming movable knife
  • the driving component drives the thread trimming movable knife to move between the thread trimming station and the thread hooking station along the length direction of the sewing machine; when the thread trimming movable knife moves to the thread trimming station, The fixed knife edge is in contact with the movable knife edge; when the thread trimming movable knife moves to the thread hooking station, the thread hooking hole of the thread hooking groove moves below the needle of the sewing machine.
  • the thread trimming fixed knife is provided with a knife guide groove, and the length direction of the knife guide groove is the same as the length direction of the sewing machine;
  • the driving component includes:
  • Transmission fork one end of the transmission fork is movably connected with the support shaft, and the other end of the transmission fork is provided with a fork;
  • a fixed pin the upper end of the fixed pin is inserted into the knife guide groove, and is connected to the end of the thread trimming movable knife away from the movable knife edge, and the lower end of the fixed pin is inserted into the fork;
  • a transmission rod, one end of the transmission rod is connected to the middle of the transmission fork;
  • the driving mechanism is connected with the other end of the transmission rod.
  • the driving mechanism includes:
  • a crank one end of the crank is connected to the drive source member, and the drive source member drives the crank to rotate;
  • the intermediate sliding member includes a bearing shaft fixedly arranged along the length direction of the sewing machine, and a transmission sliding rod is provided on the bearing shaft, and the transmission sliding rod can slide along the receiving shaft; the transmission sliding rod and The other end of the crank is connected, and the transmission sliding rod is connected to the other end of the transmission rod.
  • the driving mechanism further includes two fixed mounting plates, and two ends of the bearing shaft are respectively connected with the two mounting plates;
  • the transmission slide bar is sleeved on the bearing shaft, a support spring is sleeved on the bearing shaft, and the support spring is located in the transmission slide bar and the two mounting plates far from the needle Between the mounting plates.
  • the driving mechanism includes: a thread trimmer drive assembly, a thread trimming limit assembly and a fixed drive base;
  • a limit groove is provided on the base of the driving member, a guide through hole is provided on the bottom surface of the limit groove, and the length direction of the guide through hole is the same as the length direction of the sewing machine;
  • the thread cutter drive assembly includes:
  • Thread cutter drive element
  • a driving link connected with the output end of the thread trimmer driving element, and a stopper is provided on one end of the driving link away from the thread trimmer driving element;
  • the limit spring is sleeved on the drive connecting rod and is located between the stopper and the thread trimmer drive element;
  • a transmission component movably installed on the base of the driving component, and the transmission component is connected with the driving link;
  • a drive pin one end of the drive pin is connected to the transmission component; the other end of the drive pin passes through the guide through hole and is connected to the other end of the transmission rod;
  • the thread trimming limit component includes:
  • a limit plate the limit plate is connected with the output end of the limit drive element, and the limit plate is provided with a limit through hole for the drive pin to insert.
  • the transmission component includes:
  • a transmission link is hinged on the base of the drive member, one end of the drive link is connected with the drive link, and one end of the drive pin is connected with the drive link;
  • the driving block is arranged in the limiting slot, the driving pin is connected with the driving block, and the driving block can move in the limiting slot.
  • the limit plate includes a limit connecting rod and a limit push plate; one end of the limit connecting rod is connected to the limit driving element, and the other end of the limit connecting rod is connected to the limit driving element. One end of the limit push plate is connected, the other end of the limit push plate is between the transmission link and the drive block, and the limit through hole is provided on the limit push plate;
  • the thread trimming limit assembly further includes: a limit block placed on the base of the driving member and a coil spring member installed on the base of the driver, one end of the coil spring is connected to the limit block ;
  • the limit block is in contact with the side of the drive block close to the needle.
  • the sewing thread trimming mechanism further includes a suction device arranged below the thread trimming movable knife; the thread hook groove is provided with a thread arranging hole, and the thread arranging hole is located at the thread hook Between the hole and the edge of the movable knife; when the movable thread trimming knife moves to the thread trimming station, the suction port of the suction device is located below the wire arranging hole.
  • the invention also relates to a seam-starting and thread-cutting method, which adopts the seam-starting and thread-cutting mechanism, and includes the following steps:
  • the driving component drives the movable thread trimming knife to move to the sewing starting station between the thread trimming station and the thread hooking station; when the thread trimming movable knife is at the sewing starting station, The thread hooking hole of the thread hooking groove of the thread trimming movable knife is moved away from the bottom of the needle, the fixed knife edge does not engage with the movable knife edge, and the thread end of the suture is located at the thread trimming fixed The knife and the thread trimming movable knife are not cut; the needle of the sewing machine moves to sew 1 stitch or 2 stitches;
  • the driving component drives the movable thread trimming knife to move to the thread trimming station, and the fixed knife edge engages with the movable knife edge to cut off the thread end of the suture;
  • the drive component drives the thread trimming movable knife to move to the thread hooking station below the needle, the thread end on the side of the needle with the suture enters the thread hooking hole of the thread hooking groove, and then ,
  • the needle begins to rise, until the thread take-up lever of the sewing machine takes up the thread to the highest point, the thread trimming movable knife moves to the sewing starting station between the thread trimming station and the thread hooking station, so that the thread end of the suture is in the thread hooking groove In the thread hooking hole of the sewing thread, and the thread end of the suture is located between the fixed thread trimming knife and the thread trimming movable knife without cutting, the needle of the sewing machine moves to sew 1 needle or 2 stitches;
  • the driving component drives the thread trimming movable knife to move to the cutting In the thread station, the fixed knife edge is engaged with the movable knife edge to cut off the thread end of the suture; this makes the start of the seam unable to form the suture end entanglement, realizes
  • Fig. 1 shows a schematic structural diagram of a thread trimming structure of a conventional sewing machine.
  • Fig. 2 shows a schematic top view of the structure of the sewing machine of the first embodiment.
  • Fig. 3 shows a schematic diagram of the bottom structure of the sewing machine of embodiment 1.
  • Fig. 4 is a schematic diagram showing the structure of the thread trimming movable knife of the sewing machine of the embodiment 1 moving to the thread hooking station and the needle penetrated into the thread hooking hole.
  • Fig. 5 is a schematic diagram showing the structure of the thread trimming movable knife of the sewing machine of embodiment 1 moving to the sewing starting station.
  • Fig. 6 is a schematic diagram showing the structure of the thread trimming movable knife of the sewing machine of Embodiment 1 moving to the thread hooking station and the needle ascending.
  • Fig. 7 is a schematic diagram showing the structure of the thread trimming movable knife and the thread trimming fixed knife of the sewing machine of Embodiment 1 when they are in the thread trimming station.
  • Fig. 8 is a schematic diagram showing the structure of the sewing machine of embodiment 1 when the needle is above the bottom plate.
  • Fig. 9 is a schematic view of the three-dimensional structure of the thread-cutting movable knife of the sewing machine of the first embodiment.
  • FIG. 10 is a schematic diagram of the three-dimensional structure of the thread trimming fixed knife of the sewing machine of Embodiment 1.
  • Fig. 11 is a schematic diagram showing the upper structure of the sewing machine of the embodiment 1 when the thread trimming movable knife is moved to the thread hooking station and the needle and the bottom plate are not set.
  • Fig. 12 shows a schematic diagram of the bottom structure of the sewing machine of the embodiment 1 when the thread trimming movable knife is moved to the thread hooking station and the needle and the bottom plate are not set.
  • FIG. 13 is a schematic diagram showing the structure of the air suction device of the sewing machine of Embodiment 1.
  • FIG. 13 is a schematic diagram showing the structure of the air suction device of the sewing machine of Embodiment 1.
  • Fig. 14 is a schematic diagram showing the structure of the transmission slide bar of the sewing machine of the first embodiment.
  • Fig. 15 is a schematic diagram showing the structure of the knife seat plate of the sewing machine of the first embodiment.
  • Fig. 16 shows a schematic diagram of the bottom structure of the sewing machine of the second embodiment.
  • Fig. 17 is a schematic view showing the structure of the driving member base and the cover plate of the sewing machine of the second embodiment when disassembled.
  • Fig. 18 is a schematic diagram showing the structure of the driving mechanism of the sewing machine of the second embodiment.
  • Fig. 19 is a schematic diagram showing the structure of the driving mechanism when the movable thread trimming knife of Embodiment 2 moves toward the thread hooking station, and the movable thread trimmer knife does not move to the thread hooking station.
  • Fig. 20 is a schematic diagram showing the structure of the driving mechanism when the thread trimming movable knife of the second embodiment moves to the thread hooking station.
  • Fig. 21 is a schematic diagram showing the structure of the driving mechanism when the movable thread trimming knife of the second embodiment moves to the thread trimming station.
  • Fig. 22 is a schematic diagram showing the structure of the thread trimming limit component of the sewing machine of the second embodiment.
  • Fig. 23 is a schematic diagram showing the structure of the driving member base of the sewing machine of the second embodiment.
  • the left and right directions of the paper surface are defined as the length direction of the sewing machine, and the vertical direction of the paper surface is defined as the width direction of the sewing machine; the length direction of the sewing machine is the length direction of the bottom plate 10.
  • the width direction of is the width direction of the bottom plate 10.
  • the sewing and trimming mechanism of this embodiment includes:
  • a fixed thread trimming knife 100 is fixedly arranged, and an end of the thread trimming fixture 100 close to the needle 20 of the sewing machine is provided with a fixed knife edge 101;
  • the thread trimming movable knife 200 is arranged under the fixed thread trimming knife 100; the thread hooking groove 210 is provided on the top surface of the thread trimming movable knife 200; the thread trimming movable knife 200 is close to the needle 20 of the sewing machine One end is provided with a movable knife edge 201; the wire hook groove 210 is provided with a wire hook hole 211, and the wire hook hole 211 is located on the end of the wire hook groove 210 away from the movable knife edge 201;
  • the driving part 300 is connected with the thread cutting movable knife 200;
  • the driving part 300 drives the thread trimming movable knife 200 to move between the thread trimming station and the thread hooking station along the length of the sewing machine; when the thread trimming movable knife 200 moves to the thread trimming station, the fixed blade 101 and the movable blade When the thread trimming movable knife 200 moves to the thread hooking station, the thread hooking hole 211 of the thread hooking groove 210 moves to just below the needle 20 of the sewing machine.
  • the driving component 300 drives the thread trimming movable knife 200 to move to the thread hooking station below the machine needle 20, and the thread end of the suture 700 threaded on the machine needle 20 enters the thread hooking groove 210 In the hole 211, subsequently, the machine needle 20 starts to rise again until the thread take-up lever of the sewing machine takes up the thread to the highest point, and the thread trimming movable knife 200 moves to the sewing starting position between the thread trimming station and the thread hooking station, so that the sewing The thread end of the thread 700 is in the thread hooking groove 210, and the thread end of the suture 700 is located between the fixed thread trimming knife 100 and the movable thread trimming knife 200 without cutting.
  • the needle 20 of the sewing machine moves to sew 1 stitch or 2 stitches;
  • the component 300 drives the thread trimming movable knife 200 to move to the thread trimming station, the fixed knife edge 101 engages with the movable knife edge 201, and cuts the thread end of the suture 700; this makes it impossible to form the thread end winding of the suture 700 and realize the sewing start Anti-bird's nest, to solve the problem of "bird's nest-like" thread on the reverse side of the sewing machine at the beginning of the sewing machine, to ensure the beauty of the front and rear stitches of the sewing, reduce the trimming of the thread, and achieve high-quality sewing; at the same time, due to the seam at the beginning of the seam
  • the thread end of the thread 700 is located between the movable thread trimming knife 200 and the thread trimming fixed knife 100, which can effectively reduce the probability of seam slippage.
  • the thread trimming fixed knife 100 is provided with a knife guide groove 110, and the length direction of the knife guide groove 110 is the same as the length direction of the sewing machine;
  • the driving part 300 includes:
  • a fixed support shaft 310 A fixed support shaft 310;
  • Transmission fork 320 one end of the transmission fork 320 is movably connected with the support shaft 310, and the other end of the transmission fork 320 is provided with a fork opening 321;
  • the upper end of the fixed pin 330 is inserted into the knife guide groove 110, and is connected to the end of the thread trimming movable knife 200 away from the movable knife edge 201, and the thread hooking hole 211 is located between the movable knife edge 201 and the fixed pin 330 , The lower end of the fixing pin 330 is inserted into the fork 321;
  • Transmission rod 340 one end of the transmission rod 340 is connected to the middle of the transmission fork 320;
  • the driving mechanism 350 is connected to the other end of the transmission rod 340.
  • the driving mechanism 350 drives the transmission fork 320 through the transmission rod 340, so that the transmission fork 320 swings around the support shaft 310, and the transmission fork 320 drives the fixed pin 330 to move in the knife guide groove 110 along the length direction of the sewing machine, so that the fixed pin 330 Drive the thread trimming movable knife 200 to move along the length direction of the sewing machine.
  • the driving mechanism 350 includes:
  • crank 520 one end of the crank 520 is connected to the driving source 510, and the driving source 510 drives the crank 520 to rotate;
  • the intermediate sliding member 530 includes a receiving shaft 531 fixedly arranged along the length of the sewing machine.
  • the receiving shaft 531 is provided with a transmission sliding rod 532, which can slide along the receiving shaft 531; the transmission sliding rod 532 and the crank 520 The other end is connected, and the transmission sliding rod 532 is connected with the other end of the transmission rod 340.
  • the driving source 510 drives the crank 520 to swing, the crank 520 drives the transmission sliding rod 532 to move along the axial direction of the receiving shaft 531, and the receiving shaft 531 drives the transmission rod 340 to move.
  • the structure of this embodiment enables the crank 520 to drive the transmission rod 340 through the transmission sliding rod 532 to move along the length of the sewing machine.
  • the simple structure realizes the driving of the transmission rod 340, which is convenient for the transmission rod 340 to drive the fixed pin through the transmission fork 320. 330 moves.
  • the driving source 510 is a motor, and the output end of the motor is connected to the crank 520.
  • the driving mechanism 350 also includes two fixed mounting plates 541, the two ends of the bearing shaft 531 are respectively connected to the two mounting plates 541; the transmission sliding rod 532 is sleeved on the bearing shaft 531, and a support spring 542 is sleeved on the bearing shaft 531. Above, the support spring 542 is located between the transmission sliding rod 532 and the mounting plate 541 of the two mounting plates 541 that is far from the needle 20.
  • the driving source 510 drives the crank 520 to swing, the crank 520 drives the transmission sliding rod 532, and the transmission sliding rod 532 drives the fixed pin 330 to the position away from the needle 20 through the transmission fork 320
  • the support spring 542 is compressed; the setting of the support spring 542 plays a role in limiting the moving distance of the transmission sliding rod 532 and ensures that the thread hooking groove 210 of the movable thread trimming knife 200 can move directly below the needle 20.
  • the sewing and trimming mechanism also includes: a knife seat plate 600.
  • the top surface of the knife seat plate 600 is provided with a knife body installation groove 610, and the thread trimming fixed knife 100 and the thread trimming movable knife 200 are both arranged in the knife body installation groove 610 ,
  • the thread trimming movable knife 200 is under the thread trimming fixed knife 100;
  • the bottom surface of the knife body installation groove 610 is provided with a pin moving hole 611, and the length direction of the pin moving hole 611 is the same as that of the sewing machine; the fixed pin
  • the top of the 330 passes through the pin moving hole 611 and the knife guide groove 110, and is connected with the thread trimming movable knife 200.
  • This structure makes the position of the fixed thread cutting knife 100 stable, and the movable thread cutting knife 200 can move stably relative to the fixed thread cutting knife 100.
  • the sewing and trimming mechanism also includes: an air suction device 400 arranged under the thread trimming movable knife 200; the thread hooking groove 210 is provided with a thread arranging hole 212, when the thread trimming movable knife 200 moves to the thread trimming station, the suction device 400 The suction port 410 of the air device 400 is located below the cable hole 212.
  • the sewing and trimming mechanism further includes a first controller, which is connected to the driving source 510, and the first controller controls the operation of the driving source 510.
  • the first controller realizes the cyclic operation of the sewing thread trimming mechanism controlled by the electric control.
  • the driving source 510 is a motor.
  • the seam-starting and thread-cutting method of this embodiment adopts a seam-starting and thread-cutting mechanism, and includes the following steps:
  • the first controller controls the driving part 300 so that after the driving part 300 drives the thread trimming movable knife 200 to move to the thread hooking station, the first controller controls the movement of the needle 20 of the sewing machine, and the sewing thread is threaded on the needle 20 The end of the thread passes through the drop hole of the needle plate and enters the thread hooking hole 211 of the thread hooking groove 210. Then, the first controller controls the needle 20 of the sewing machine to start to rise, and the thread end of the suture on the needle 20 is in the thread hooking hole 211 The first controller controls the needle 20 of the sewing machine to continue rising until the first controller controls the thread take-up lever of the sewing machine to take up the thread to the highest point;
  • the first controller controls the driving part 300, and the driving part 300 drives the thread trimming movable knife 200 to move to the sewing starting station between the thread trimming station and the thread hooking station; when the thread trimming movable knife 200 is at the sewing starting station
  • the thread hooking hole 211 of the thread hooking groove 210 of the thread trimming movable knife 200 is removed from below the needle 20, the fixed knife edge 101 does not engage with the movable knife edge 201, and the thread end of the suture 700 is located between the thread trimming fixed knife 100 and The thread trimming movable knife 200 does not cut, and the thread end of the suture 700 is in the thread arranging hole 212 of the thread hooking groove 210; the needle 20 of the sewing machine moves to sew 1 stitch or 2 stitches;
  • the first controller controls the driving part 300, the driving part 300 drives the thread trimming movable knife 200 to move to the thread trimming station, the fixed knife edge 101 engages with the movable knife edge 201, and cuts the thread end thread trimming fixed knife 100 and the fixed knife 100 of the suture 700 Reset the thread trimming movable knife 200 to the initial state;
  • the thread end of the suture 700 cut by the thread trimming movable knife 200 remains in the thread arranging hole 212.
  • part of the thread trimming movable knife 200 moves toward the needle 20, and part of the remaining cut
  • the thread ends of the suture 700 are removed from the movable thread trimming knife 200, and are collected under the suction effect of the suction device 400 to avoid the thread ends from being scattered.
  • the length of the thread hooking groove 210 of the movable thread trimming knife 200 ensures the required distance of thread hooking action and the effective length of the movable knife edge 201.
  • the thread ends of the cut suture 700 of different lengths can be smoothly on the thread hooking groove 210 Escape and suck it away in the inhalation device 400.
  • the thread end of the suture 700 is located between the fixed thread trimming knife 100 and the movable thread trimming knife 200 without cutting.
  • the thread end of the suture 700 is located in the thread arranging hole 212 of the thread hooking groove 210 to increase the tension of the thread end of the suture 700 and take up the thread.
  • the rod is not easy to draw the thread end of the suture 700 from the needle plate hole of the needle plate during the thread take-up process, which can effectively reduce the probability of the sewing thread coming off.
  • the driving mechanism 350 includes: a thread trimmer drive assembly 550, a thread trimming limit assembly 560, and a fixed drive base 570;
  • a limit slot 571 is provided on the driving part base 570, and a guide through hole 572 is provided on the bottom surface of the limit slot 571, and the length direction of the guide through hole 572 is the same as the length direction of the sewing machine;
  • the thread cutter drive assembly 550 includes:
  • Thread cutter drive element 551
  • the driving link 552 is connected to the output end of the thread trimmer driving element 551, and a stop 553 is provided on the end of the driving link 552 away from the thread trimmer driving element 551;
  • the limit spring 554 is sleeved on the driving link 552 and is located between the stopper 553 and the thread cutter driving element 551;
  • the transmission part 555 is movably installed on the driving part base 570, and the transmission part 555 is connected with the driving connecting rod 552;
  • Drive pin 556 one end of the drive pin 556 is connected to the transmission component 555; the other end of the drive pin 556 passes through the guide through hole 572 and is connected to the other end of the transmission rod 340;
  • the thread cutter driving element 551 drives the transmission part 555 to move through the driving link 552, so that the transmission part 555 drives the driving pin 556 through the transmission part 555 to move along the length direction of the sewing machine in the guide through hole 572;
  • the thread trimming limit component 560 includes:
  • the limit plate 562 is connected to the output end of the limit driving element 561, and the limit plate 562 is provided with a limit through hole 563 into which the driving pin 556 is inserted.
  • the thread trimmer driving element 551 drives the transmission part 555 to move through the driving link 552, the limit spring 554 contracts, and the transmission part 555 drives the driving pin 556 to the guide through hole 572
  • the drive pin 556 drives the drive fork 320 to move through the drive rod 340, the drive fork 320 drives the fixed pin 330, and the fixed pin 330 drives the thread trimming movable knife 200 to move to the thread hooking station;
  • the limit spring 554 returns to the initial state, and the restoring force of the limit spring 554 makes the driving link 552 drive the transmission part 555 to move for a certain distance, and the transmission part 555 Drive the drive pin 556, the drive pin 556 drives the drive fork 320 to move through the drive rod 340, and the drive fork 320 drives the fixed pin 330, so that the fixed pin 330 drives the thread trimming movable knife 200 to move to the sewing station;
  • the limit driving element 561 drives the limit plate 562 to move, so that the limit plate 562 drives the drive pin 556 to move, and the drive pin 556 drives the transmission through the transmission rod 340
  • the fork 320 moves, the transmission fork 320 drives the fixed pin 330, and the fixed pin 330 drives the thread trimming movable knife 200 to move to the thread trimming station.
  • Transmission components 555 include:
  • the transmission link 557 is hinged to the drive base 570, one end of the transmission link 557 is connected with the drive link 552, and one end of the drive pin 556 is connected with the drive link 557;
  • the driving block 558 is arranged in the limiting slot 571, the driving pin 556 is connected with the driving block 558, and the driving block 558 can move in the limiting slot 571.
  • the driving connecting rod 552 drives the driving pin 556 to move through the driving connecting rod 557. While the driving pin 556 drives the driving rod 340, the driving pin 556 also drives The driving block 558 moves in the limit slot 571. Since the moving path of the driving block 558 is restricted in the limiting groove 571, this structure can limit the moving path of the driving pin 556, which is convenient for the transmission component 555 to achieve a stable transmission effect.
  • the limit plate 562 includes a limit connecting rod 564 and a limit push plate 565; one end of the limit connecting rod 564 is connected with the limit driving element 561, and the other end of the limit connecting rod 564 is connected with one end of the limit push plate 565 , The other end of the limit push plate 565 is between the transmission connecting rod 557 and the driving block 558, and the limit through hole 563 is provided on the limit push plate 565;
  • the thread trimming limit component 560 also includes: a limit block 566 placed on the driver base 570 and a coil spring 567 installed on the driver base 570. One end of the coil spring 567 is connected with the limit block 566; The block 566 is in contact with the side of the driving block 558 close to the needle 20.
  • the transmission component 555 drives the drive pin 556 to move in the guide through hole 572 along the length of the sewing machine, and the drive pin 556 drives the drive block 558 to move in the limit slot 571.
  • the driving pin 556 drives the limit push plate 565 to move, and the limit push plate 565 pulls the limit driving element 561.
  • the limit slot 571 is provided with a stopper 553, and the stopper 553 is disposed in the limit slot 571.
  • the limit push plate 565 When the driving pin 556 drives the limit push plate 565 to move, and the limit push plate 565 contacts the blocking member 553, the limit push plate 565 is in the limit position; due to the movement of the driving block 558 , When the driving block 558 is in the initial position, the limit block 566 in contact with the driving block 558 swings around the coil spring 567, and the limit block 566 enters the limit slot 571;
  • the driving force applied by the thread trimming knife drive element 551 to the driving link 552 disappears, and the limit spring 554 returns to the initial state, and the restoring force of the limit spring 554
  • the drive connecting rod 552 drives the transmission component 555 to move for a certain distance
  • the transmission component 555 drives the drive pin 556
  • the drive pin 556 drives the transmission fork 320 to move through the transmission rod 340
  • the transmission fork 320 drives the fixed pin 330 to drive the thread trimming movable knife 200 to move to the start.
  • the limit driving element 561 drives the limit connecting rod 564 to move, the limit connecting rod 564 drives the limit push plate 565 to move, and the limit push plate 565 drives the driving pin 556 moves, the drive pin 556 drives the drive block 558 to move, and the limit block 566 in contact with the drive block 558 swings around the coil spring 567, and the limit block 566 moves out of the limit slot 571; the drive pin 556 passes through the transmission rod 340 drives the transmission fork 320 to move, and the transmission fork 320 drives the fixed pin 330 to drive the thread trimming movable knife 200 to move to the thread trimming station.
  • the arrangement of the limit plate 562 and the thread trimming limit component 560 enables the thread trimming movable knife 200 to accurately move to the thread hooking station, the sewing station and the thread trimming station.
  • the drive base 570 is provided with a cover plate 580, and the cover plate 580 is provided with a plate through hole 581 through which the drive pin 556 passes; the transmission link 557 is hinged to the drive base 570 through an axis nut 591 On; the torsion spring member 567 through the torsion spring mounting member 592 is set on the drive base 570.
  • the thread cutter drive element 551 and the limit drive element 561 are air cylinders.
  • the sewing thread trimming mechanism further includes: a second controller, which is connected to the thread trimmer drive element 551 and the limit drive element 561, and the second controller controls the thread trimmer drive element 551 and the limit drive element 561 run.
  • the seam-starting and thread-cutting mechanism is installed on the bottom plate 10 of the sewing machine, and does not affect the sewing operation; the seam-starting and thread-cutting mechanism cuts off the excess thread ends of the seam thread under the bottom plate 10, and can cut off the “invalid” thread ends of the seam.
  • the thread trimming movable knife 200 is driven synchronously, and the 700 thread ends of the upper thread are grasped more stably, which reduces the probability that the seam and the bottom thread cannot be brought out of the seam; this seam cutter
  • the thread mechanism is installed with an independent drive module, which has a wider range of use; the structure of the thread cutting movable knife 200 enables the thread ends cut with different lengths to fall off and suck away.
  • this embodiment effectively overcomes various shortcomings in the prior art and has a high industrial value.

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Abstract

一种起缝剪线机构，包括固定设置的剪线固定刀（100），剪线固定刀的靠近缝纫机的机针（20）的一端设有固定刀刃口（101）；剪线活动刀（200），剪线活动刀设置于剪线固定刀的下方；剪线活动刀的顶面上设有勾线槽（210）；剪线活动刀的靠近缝纫机的机针的一端设有活动刀刃口（201）；驱动部件（300），驱动部件与剪线活动刀连接；驱动部件驱动剪线活动刀沿着缝纫机的长度方向在剪线工位和勾线工位之间移动；当剪线活动刀移动到剪线工位时，固定刀刃口与活动刀刃口接触；当剪线活动刀移动到勾线工位时，勾线槽的勾线孔移动到缝纫机的机针的下方。还包括起缝剪线方法。该机构可实现起缝防鸟巢，减少修剪线头工序，有效降低起缝脱线概率。

Description

起缝剪线机构及其方法
本申请要求于2019年12月17日提交中国专利局、申请号为201911302026.0、发明名称为“起缝剪线机构及其方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及缝纫机剪线结构技术领域，特别是涉及起缝剪线机构及其方法。
背景技术
如图1所示，现有缝纫机的剪线结构是位于针板下方和旋梭上方的第一活动刀2和第二活动刀4，第二活动刀4通过驱动机构驱动绕下轴旋转，第二活动刀4的刀尖分开缝线线环带着缝线向着与第一活动刀2相对方向摆动，在缝纫机针3下方咬合切断缝线，在复位簧的作用下复位。剪线后缝纫机针3的一侧残留一定长度的缝线线头保证下次正常起缝，该线头在缝纫前几针会形成不良线迹，俗称“鸟巢”；“鸟巢”的设置会影响缝制品的质量；当剪线线头长短不稳定，缝制针距较小时，起缝缝线的线头无张力，还会出现起缝脱线的问题。
发明内容
鉴于以上所述现有技术的缺点，本发明要解决的技术问题在于提供一种起缝剪线机构及其方法。
为了解决上述技术问题，本发明提供一种起缝剪线机构，包括：
固定设置的剪线固定刀，所述剪线固定刀的靠近缝纫机的机针的一端设有固定刀刃口；
剪线活动刀，所述剪线活动刀设置于所述剪线固定刀的下方；所述剪线活动刀的顶面上设有勾线槽；所述剪线活动刀的靠近缝纫机的机针的一端设有活动刀刃口；所述勾线槽上设有勾线孔，所述勾线孔处于所述勾线槽的远离所述活动刀刃口的一端上；
驱动部件，所述驱动部件与所述剪线活动刀连接；
所述驱动部件驱动所述剪线活动刀沿着所述缝纫机的长度方向在剪线工位和勾线工位之间移动；当所述剪线活动刀移动到所述剪线工位时，所述固定刀刃口与所述活动刀刃口接触；当所述剪线活动刀移动到所述勾线工位时，所述勾线槽的所述勾线孔移动到缝纫机的机针的下方。
优选地，所述剪线固定刀上设有刀部导向槽，所述刀部导向槽的长度方向与所述缝纫机的长度方向同向；
所述驱动部件包括：
固定设置的支撑轴；
传动叉，所述传动叉的一端与所述支撑轴活动连接，所述传动叉的另一端设有叉口；
固定销，所述固定销的上端插入于所述刀部导向槽中，且与所述剪线活动刀上远离所述活动刀刃口的一端连接，所述固定销的下端插入于叉口中；
传动杆，所述传动杆的一端与所述传动叉的中部连接；
驱动机构，所述驱动机构与所述传动杆的另一端连接。
进一步地，所述驱动机构包括：
驱动源件；
曲柄，所述曲柄的一端与所述驱动源件连接，所述驱动源件带动所述曲柄转动；
中间滑动件，包括沿着所述缝纫机的长度方向固定设置的承接轴，所述承接轴上设有传动滑杆，所述传动滑杆可沿着所述承接轴滑动；所述传动滑杆与所述曲柄的另一端连接，且所述传动滑杆与所述传动杆的另一端连接。
更进一步地，所述驱动机构还包括两个固定设置的安装板，所述承接轴的两端分别与两个所述安装板连接；
所述传动滑杆套在所述承接轴上，一支撑弹簧套设在所述承接轴上，所述支撑弹簧处于所述传动滑杆与两个所述安装板中的远离所述机针的所述安装板之间。
进一步地，所述驱动机构包括：剪线刀驱动组件、剪线限位组件和固定设置的驱动件底座；
所述驱动件底座上设有限位槽，所述限位槽的槽底面上设有导向通孔，所述导向通孔的长度方向与所述缝纫机的长度方向同向；
所述剪线刀驱动组件包括：
剪线刀驱动元件；
驱动连杆，与所述剪线刀驱动元件的输出端连接，所述驱动连杆的远离所述剪线刀驱动元件的一端上设置挡件；
限位弹簧，套设在所述驱动连杆上，且处于所述挡件与所述剪线刀驱动元件之间；
传动部件，活动安装于所述驱动件底座上，且所述传动部件与所述驱动连杆连接；
驱动销，所述驱动销的一端与所述传动部件连接；所述驱动销的另一端穿过所述导向通孔，与所述传动杆的另一端连接；
所述剪线限位组件包括：
限位驱动元件；
限位板件，所述限位板件与所述限位驱动元件的输出端连接，所述限位板件上设有供所述驱动销插入的限位通孔。
更进一步地，所述传动部件包括：
传动连杆，铰接于所述驱动件底座上，所述传动连杆的一端与所述驱动连杆连接，所述驱动销的一端与所述传动连杆连接；
驱动块，设置于所述限位槽中，所述驱动销与所述驱动块连接，所述驱动块可在所述限位槽中移动。
再进一步地，所述限位板件包括限位连接杆和限位推板；所述限位连接杆的一端与所述限位驱动元件连接，所述限位连接杆的另一端与所述限位推板的一端连接，所述限位推板的另一端处于所述传动连杆与所述驱动块之间，所述限位通孔设置于所述限位推板上；
所述剪线限位组件还包括：放置于所述驱动件底座上的限位块和安装于所述驱动件底座上的纽簧件，所述纽簧件的一端与所述限位块连接；所 述限位块与所述驱动块的靠近所述机针的一侧接触。
进一步地，所述的起缝剪线机构，还包括设置于所述剪线活动刀下方的吸气装置；所述勾线槽上设有排线孔，所述排线孔处于所述勾线孔与所述活动刀刃口之间；当所述剪线活动刀移动到所述剪线工位时，所述吸气装置的吸气口处于所述排线孔的下方。
本发明还涉及一种起缝剪线方法，采用所述的起缝剪线机构，包括以下步骤：
1)所述驱动部件驱动所述剪线活动刀移动到勾线工位后，缝纫机的机针运动，所述机针上穿设的缝线的线头穿过针板落针孔进入勾线槽的勾线孔中，随后，所述机针开始回升，机针上的所述缝线的线头处于所述勾线孔的底部，所述机针继续回升，直到缝纫机的挑线杆收线到最高点；
2)所述驱动部件驱动所述剪线活动刀移动到所述剪线工位与所述勾线工位之间的起缝工位；当所述剪线活动刀处于起缝工位时，所述剪线活动刀的勾线槽的勾线孔从所述机针的下方移开，所述固定刀刃口与所述活动刀刃口不咬合，所述缝线的线头位于所述剪线固定刀与所述剪线活动刀之间不切断；所述缝纫机的机针运动，缝制1针或2针；
3)所述驱动部件驱动所述剪线活动刀移动到剪线工位，所述固定刀刃口与所述活动刀刃口咬合，切断所述缝线的线头；
4)所述缝纫机的机针继续运转，进行缝纫。
如上所述，本发明的起缝剪线机构及其方法，具有以下有益效果：
本发明的起缝剪线机构及其方法，驱动部件驱动剪线活动刀移动到机针下方的勾线工位，机针带缝线一侧的线头进入勾线槽的勾线孔中，随后，机针开始回升，直到缝纫机的挑线杆收线到最高点，剪线活动刀移动到剪线工位与勾线工位之间的起缝工位，使得缝线的线头处于勾线槽的勾线孔中，且缝线的线头位于剪线固定刀与剪线活动刀之间不切断，缝纫机的机针运动，缝制1针或2针；驱动部件驱动剪线活动刀移动到剪线工位，固定刀刃口与活动刀刃口咬合，切断缝线的线头；这就使得起缝无法形成缝线线头缠绕，实现起缝防鸟巢，解决缝纫机起缝处缝料反面残留“鸟巢状”线团的问题，保证缝纫前端和后端线迹的美观，减少修剪线头工序，实现 高品质的缝纫；同时，由于起缝时的缝线的线头位于剪线活动刀与剪线固定刀之间，可有效降低起缝脱线概率。
附图说明
图1显示为现有的缝纫机的剪线结构的结构示意图。
图2显示为实施例1的缝纫机的俯视结构示意图。
图3显示为实施例1的缝纫机的底部结构示意图。
图4显示为实施例1的缝纫机的剪线活动刀移动到勾线工位且机针穿入到勾线孔中的结构示意图。
图5显示为实施例1的缝纫机的剪线活动刀移动到起缝工位的结构示意图。
图6显示为实施例1的缝纫机的剪线活动刀移动到勾线工位且机针上升的结构示意图。
图7显示为实施例1的缝纫机的剪线活动刀和剪线固定刀处于剪线工位时的结构示意图。
图8显示为实施例1的缝纫机的机针处于底板上方时的结构示意图。
图9显示为实施例1的缝纫机的剪线活动刀的立体结构示意图。
图10显示为实施例1的缝纫机的剪线固定刀的立体结构示意图。
图11显示为实施例1的缝纫机的剪线活动刀移动到勾线工位且未设置机针和底板时的上部结构示意图。
图12显示为实施例1的缝纫机的剪线活动刀移动到勾线工位且未设置机针和底板时的底部结构示意图。
图13显示为实施例1的缝纫机的吸气装置的结构示意图。
图14显示为实施例1的缝纫机的传动滑杆的结构示意图。
图15显示为实施例1的缝纫机的刀座板的结构示意图。
图16显示为实施例2的缝纫机的底部结构示意图。
图17显示为实施例2的缝纫机的驱动件底座和盖板分解时的结构示意图。
图18显示为实施例2的缝纫机的驱动机构的结构示意图。
图19显示为实施例2的剪线活动刀向着勾线工位移动，且剪线活动刀未移动到勾线工位时的驱动机构的结构示意图。
图20显示为实施例2的剪线活动刀移动到勾线工位时的驱动机构的结构示意图。
图21显示为实施例2的剪线活动刀移动到剪线工位时的驱动机构的结构示意图。
图22显示为实施例2的缝纫机的剪线限位组件的结构示意图。
图23显示为实施例2的缝纫机的驱动件底座的结构示意图。
附图标号说明：
10                  底板
20                  机针
100                 剪线固定刀
101                 固定刀刃口
110                 刀部导向槽
200                 剪线活动刀
210                 勾线槽
211                 勾线孔
212                 排线孔
201                 活动刀刃口
300                 驱动部件
310                 支撑轴
320                 传动叉
321                 叉口
330                 固定销
340                 传动杆
350                 驱动机构
510                 驱动源件
520                 曲柄
530                 中间滑动件
531                 承接轴
532                 传动滑杆
541                 安装板
542                 支撑弹簧
550                 剪线刀驱动组件
551                 剪线刀驱动元件
552                 驱动连杆
553                 挡件
554                 限位弹簧
555                 传动部件
556                 驱动销
557                 传动连杆
558                 驱动块
560                 剪线限位组件
561                 限位驱动元件
562                 限位板件
563                 限位通孔
564                 限位连接杆
565                 限位推板
566                 限位块
567                 纽簧件
570                 驱动件底座
571                 限位槽
572                 导向通孔
580                 盖板
581                 板体通孔
591                 轴位螺母
592                 扭簧安装件
400                 吸气装置
410                 吸气口
600                 刀座板
610                 刀体安装槽
611                 销子移动孔
700                 缝线
具体实施方式
以下由特定的具体实施例说明本发明的实施方式，熟悉此技术的人士可由本说明书所揭露的内容轻易地了解本发明的其他优点及功效。
请参阅附图。须知，本说明书所附图式所绘示的结构、比例、大小等，均仅用以配合说明书所揭示的内容，以供熟悉此技术的人士了解与阅读，并非用以限定本发明可实施的限定条件，故不具技术上的实质意义，任何结构的修饰、比例关系的改变或大小的调整，在不影响本发明所能产生的功效及所能达成的目的下，均应仍落在本发明所揭示的技术内容所能涵盖的范围内。同时，本说明书中所引用的如“上”、“下”、“左”、“右”、“中间”及“一”等的用语，亦仅为便于叙述的明了，而非用以限定本发明可实施的范围，其相对关系的改变或调整，在无实质变更技术内容下，当亦视为本发明可实施的范畴。
本实施例中，如图2所示，将纸面的左右方向定义为缝纫机的长度方向，并将纸面的上下方向定义为缝纫机的宽度方向；缝纫机的长度方向就是底板10的长度方向，缝纫机的宽度方向就是底板10的宽度方向。
实施例1
图2至图15，本实施例的起缝剪线机构，包括：
固定设置的剪线固定刀100，剪线固定刀100的靠近缝纫机的机针20的一端设有固定刀刃口101；
剪线活动刀200，剪线活动刀200设置于剪线固定刀100的下方；剪线活动刀200的顶面上设有勾线槽210；剪线活动刀200的靠近缝纫机的机针20的一端设有活动刀刃口201；勾线槽210上设有勾线孔211，勾线 孔211处于勾线槽210的远离活动刀刃口201的一端上；
驱动部件300，驱动部件300与剪线活动刀200连接；
驱动部件300驱动剪线活动刀200沿着缝纫机的长度方向在剪线工位和勾线工位之间移动；当剪线活动刀200移动到剪线工位时，固定刀刃口101与活动刀刃口201接触；当剪线活动刀200移动到勾线工位时，勾线槽210的勾线孔211移动到缝纫机的机针20的正下方。
本发明的起缝剪线机构，驱动部件300驱动剪线活动刀200移动到机针20下方的勾线工位，机针20上穿设的缝线700的线头进入勾线槽210的勾线孔211中，随后，机针20开始回升，直到缝纫机的挑线杆收线到最高点，剪线活动刀200移动到剪线工位与勾线工位之间的起缝工位，使得缝线700的线头处于勾线槽210中，且缝线700的线头位于剪线固定刀100与剪线活动刀200之间不切断，缝纫机的机针20运动，缝制1针或2针；驱动部件300驱动剪线活动刀200移动到剪线工位，固定刀刃口101与活动刀刃口201咬合，切断缝线700的线头；这就使得起缝无法形成缝线700的线头缠绕，实现起缝防鸟巢，解决缝纫机起缝处缝料反面残留“鸟巢状”线团的问题，保证缝纫前端和后端线迹的美观，减少修剪线头工序，实现高品质的缝纫；同时，由于起缝时的缝线700的线头位于剪线活动刀200与剪线固定刀100之间，可有效降低起缝脱线概率。
剪线固定刀100上设有刀部导向槽110，刀部导向槽110的长度方向与缝纫机的长度方向同向；
驱动部件300包括：
固定设置的支撑轴310；
传动叉320，传动叉320的一端与支撑轴310活动连接，传动叉320的另一端设有叉口321；
固定销330，固定销330的上端插入于刀部导向槽110中，且与剪线活动刀200上远离活动刀刃口201的一端连接，勾线孔211处于活动刀刃口201与固定销330之间，固定销330的下端插入于叉口321中；
传动杆340，传动杆340的一端与传动叉320的中部连接；
驱动机构350，驱动机构350与传动杆340的另一端连接。
驱动机构350驱动通过传动杆340带动传动叉320，使得传动叉320绕着支撑轴310摆动，传动叉320驱动固定销330在刀部导向槽110中沿着缝纫机的长度方向移动，使得固定销330带动剪线活动刀200沿着缝纫机的长度方向移动。
驱动机构350包括：
驱动源件510；
曲柄520，曲柄520的一端与驱动源件510连接，驱动源件510带动曲柄520转动；
中间滑动件530，包括沿着缝纫机的长度方向固定设置的承接轴531，承接轴531上设有传动滑杆532，传动滑杆532可沿着承接轴531滑动；传动滑杆532与曲柄520的另一端连接，且传动滑杆532与传动杆340的另一端连接。
驱动源件510驱动曲柄520摆动，曲柄520带动传动滑杆532沿承接轴531的轴向移动，承接轴531带动传动杆340移动。本实施例的结构能够使得曲柄520通过传动滑杆532带动传动杆340沿着缝纫机的长度方向移动，通过简单的结构实现了对传动杆340的驱动，便于传动杆340通过传动叉320带动固定销330移动。本实施例中，驱动源件510为电机，电机的输出端与曲柄520连接。
驱动机构350还包括两个固定设置的安装板541，承接轴531的两端分别与两个安装板541连接；传动滑杆532套在承接轴531上，一支撑弹簧542套设在承接轴531上，支撑弹簧542处于传动滑杆532与两个安装板541中的远离机针20的安装板541之间。
当需要剪线活动刀200移动到勾线工位时，驱动源件510驱动曲柄520摆动，曲柄520驱动传动滑杆532，传动滑杆532通过传动叉320带动固定销330向着远离机针20的方向移动时，支撑弹簧542压缩；支撑弹簧542的设置，起到限制传动滑杆532移动距离的作用，保证剪线活动刀200的勾线槽210能够移动到机针20的正下方。
起缝剪线机构，还包括：刀座板600，刀座板600的顶面上设有刀体安装槽610，剪线固定刀100和剪线活动刀200均设置于刀体安装槽610 中，剪线活动刀200处于剪线固定刀100的下方；刀体安装槽610的槽底面上设有销子移动孔611，销子移动孔611的长度方向与缝纫机的长度方向同向；固定销330的顶部穿过销子移动孔611和刀部导向槽110，且与剪线活动刀200连接。该结构使得剪线固定刀100的位置稳定，剪线活动刀200能够相对于剪线固定刀100稳定地移动。
起缝剪线机构，还包括：设置于剪线活动刀200下方的吸气装置400；勾线槽210上设有排线孔212，当剪线活动刀200移动到剪线工位时，吸气装置400的吸气口410处于排线孔212的下方。
起缝剪线机构，还包括：第一控制器，第一控制器与驱动源件510连接，第一控制器控制驱动源件510运行。第一控制器实现了通过电控控制起缝剪线机构循环工作。
本实施例中，驱动源件510为电机。
本实施例的起缝剪线方法，采用起缝剪线机构，包括以下步骤：
1)第一控制器控制驱动部件300，使得驱动部件300驱动剪线活动刀200移动到勾线工位后，第一控制器控制缝纫机的机针20运动，机针20上穿设的缝线的线头穿过针板落针孔进入勾线槽210的勾线孔211中，随后，第一控制器控制缝纫机的机针20开始回升，机针20上的缝线的线头处于勾线孔211的底部，第一控制器控制缝纫机的机针20继续回升，直到第一控制器控制缝纫机的挑线杆收线到最高点；
2)第一控制器控制驱动部件300，驱动部件300驱动剪线活动刀200移动到剪线工位与勾线工位之间的起缝工位；当剪线活动刀200处于起缝工位时，剪线活动刀200的勾线槽210的勾线孔211从机针20的下方移开，固定刀刃口101与活动刀刃口201不咬合，缝线700的线头位于剪线固定刀100与剪线活动刀200之间不切断，缝线700的线头处于勾线槽210的排线孔212中；缝纫机的机针20运动，缝制1针或2针；
3)第一控制器控制驱动部件300，驱动部件300驱动剪线活动刀200移动到剪线工位，固定刀刃口101与活动刀刃口201咬合，切断缝线700的线头剪线固定刀100和剪线活动刀200复位到初始状态；
4)缝纫机的机针20继续运转，进行缝纫。
剪线活动刀200切断的缝线700的线头部分残留在排线孔212中，剪线活动刀200在下一次缝纫启动过程，剪线活动刀200向着机针20方向运动的过程中，部分残留切断缝线700的线头从剪线活动刀200中脱出，在吸气装置400的吸气作用下被收集，避免线头的散落。
剪线活动刀200的勾线槽210的长度保证勾线动作所需距离的同时，保证活动刀刃口201的有效长度，被切断的不同长度缝线700的线头在勾线槽210上都能顺利脱出，在吸气装置400吸走。
缝线700的线头位于剪线固定刀100和剪线活动刀200之间不切断，缝线700的线头位于勾线槽210的排线孔212中，增加缝线700的线头的张力，挑线杆在收线过程中不易将缝线700的线头从针板的针板孔中抽出，可有效降低起缝脱线概率。
实施例2
如图16至图23所示，本实施例与实施例1的区别在于：驱动机构350包括：剪线刀驱动组件550、剪线限位组件560和固定设置的驱动件底座570；
驱动件底座570上设有限位槽571，限位槽571的槽底面上设有导向通孔572，导向通孔572的长度方向与缝纫机的长度方向同向；
剪线刀驱动组件550包括：
剪线刀驱动元件551；
驱动连杆552，与剪线刀驱动元件551的输出端连接，驱动连杆552的远离剪线刀驱动元件551的一端上设置挡件553；
限位弹簧554，套设在驱动连杆552上，且处于挡件553与剪线刀驱动元件551之间；
传动部件555，活动安装于件驱动件底座570上，且传动部件555与驱动连杆552连接；
驱动销556，驱动销556的一端与传动部件555连接；驱动销556的另一端穿过导向通孔572，与传动杆340的另一端连接；
剪线刀驱动元件551通过驱动连杆552带动传动部件555移动，使得 传动部件555通过传动部件555带动驱动销556在导向通孔572中沿着缝纫机的长度方向移动；
剪线限位组件560包括：
限位驱动元件561；
限位板件562，限位板件562与限位驱动元件561的输出端连接，限位板件562上设有供驱动销556插入的限位通孔563。
当需要剪线活动刀200移动到勾线工位时，剪线刀驱动元件551通过驱动连杆552带动传动部件555移动，限位弹簧554收缩，传动部件555带动驱动销556在导向通孔572中沿着缝纫机的长度方向移动，驱动销556通过传动杆340带动传动叉320移动，传动叉320驱动固定销330，固定销330带动剪线活动刀200移动到勾线工位；
当剪线刀驱动元件551对驱动连杆552施加的驱动力消失时，限位弹簧554回复初始状态，限位弹簧554的回复力使得驱动连杆552带动传动部件555移动一段距离，传动部件555带动驱动销556，驱动销556通过传动杆340带动传动叉320移动，传动叉320驱动固定销330，使得固定销330带动剪线活动刀200移动到起缝工位；
当需要剪线活动刀200移动到剪线工位时，限位驱动元件561带动限位板件562移动，使得限位板件562带动驱动销556移动，则驱动销556通过传动杆340带动传动叉320移动，传动叉320驱动固定销330，固定销330带动剪线活动刀200移动到剪线工位。
传动部件555包括：
传动连杆557，铰接于驱动件底座570上，传动连杆557的一端与驱动连杆552连接，驱动销556的一端与传动连杆557连接；
驱动块558，设置于限位槽571中，驱动销556与驱动块558连接，驱动块558可在限位槽571中移动。
当需要剪线活动刀200移动到勾线工位或者起缝工位时，驱动连杆552通过传动连杆557带动驱动销556移动，驱动销556带动传动杆340的同时，驱动销556也带动驱动块558在限位槽571中移动。由于驱动块558的移动路径被限制在限位槽571中，所以，该结构能够使得驱动销556的 移动路径被限定，便于传动部件555实现稳定的传动作用。
限位板件562包括限位连接杆564和限位推板565；限位连接杆564的一端与限位驱动元件561连接，限位连接杆564的另一端与限位推板565的一端连接，限位推板565的另一端处于传动连杆557与驱动块558之间，限位通孔563设置于限位推板565上；
剪线限位组件560还包括：放置于驱动件底座570上的限位块566和安装于驱动件底座570上的纽簧件567，纽簧件567的一端与限位块566连接；限位块566与驱动块558的靠近机针20的一侧接触。
当需要剪线活动刀200移动到勾线工位时，传动部件555带动驱动销556在导向通孔572中沿着缝纫机的长度方向移动，驱动销556带动驱动块558在限位槽571中移动的同时，驱动销556带动限位推板565移动，限位推板565拉动限位驱动元件561，本实施例中，限位槽571上设有阻挡件553，阻挡件553设置在限位槽571的远离限位块566的一端上，当驱动销556带动限位推板565移动，且限位推板565与阻挡件553接触时，限位推板565处于极限位置；由于驱动块558的移动，在驱动块558处于初始位置时，与驱动块558接触的限位块566，绕着纽簧件567摆动，限位块566进入限位槽571中；
当需要剪线活动刀200移动到起缝工位时，使剪线刀驱动元件551对驱动连杆552施加的驱动力消失，限位弹簧554就回复到初始状态，限位弹簧554的回复力使得驱动连杆552带动传动部件555移动一段距离，传动部件555带动驱动销556，驱动销556通过传动杆340带动传动叉320移动，传动叉320驱动固定销330带动剪线活动刀200移动到起缝工位；
当需要剪线活动刀200移动到剪线工位时，使限位驱动元件561带动限位连接杆564移动，限位连接杆564带动限位推板565移动，限位推板565带动驱动销556移动，驱动销556带动驱动块558移动，则与驱动块558接触的限位块566，绕着纽簧件567摆动，限位块566从限位槽571中移出；驱动销556通过传动杆340带动传动叉320移动，传动叉320驱动固定销330带动剪线活动刀200移动到剪线工位。
限位板件562和剪线限位组件560的设置，使得剪线活动刀200能够 准确地移动到勾线工位、起缝工位和剪线工位。
本实施例中，驱动件底座570上设置有盖板580，盖板580上设有供驱动销556穿过的板体通孔581；传动连杆557通过轴位螺母591铰接于驱动件底座570上；纽簧件567通过扭簧安装件592设置在驱动件底座570上。
剪线刀驱动元件551和限位驱动元件561为气缸。
起缝剪线机构，还包括：第二控制器，第二控制器与剪线刀驱动元件551和限位驱动元件561连接，第二控制器控制剪线刀驱动元件551和限位驱动元件561运行。
本发明的，起缝剪线机构安装于缝纫机的底板10上，不影响缝纫操作；起缝剪线机构在底板10下方切断起缝面线多余线头，可剪断起缝“无效”面线线头，有效防止起缝“鸟巢状”线团出现；起缝过程同步驱动剪线活动刀200动作，抓取起缝面线700线头更稳定，降低起缝脱线带不上底线概率；该起缝剪线机构为独立驱动模块安装，使用范围更广；剪线活动刀200的结构，使不同长度切断的线头能脱落吸走。
综上，本实施例有效克服了现有技术中的种种缺点而具高度产业利用价值。
上述实施例仅例示性说明本实施例的原理及其功效，而非用于限制本实施例。任何熟悉此技术的人士皆可在不违背本实施例的精神及范畴下，对上述实施例进行修饰或改变。因此，举凡所属技术领域中具有通常知识者在未脱离本实施例所揭示的精神与技术思想下所完成的一切等效修饰或改变，仍应由本实施例的权利要求所涵盖。

Claims (9)

  1. 一种起缝剪线机构，设置于缝纫机的底板(10)的下方，其特征在于，包括：
    固定设置的剪线固定刀(100)，所述剪线固定刀(100)的靠近缝纫机的机针(20)的一端设有固定刀刃口(101)；
    剪线活动刀(200)，所述剪线活动刀(200)设置于所述剪线固定刀(100)的下方；所述剪线活动刀(200)的顶面上设有勾线槽(210)；所述剪线活动刀(200)的靠近缝纫机的机针(20)的一端设有活动刀刃口(201)；所述勾线槽(210)上设有勾线孔(211)，所述勾线孔(211)处于所述勾线槽(210)的远离所述活动刀刃口(201)的一端上；
    驱动部件(300)，所述驱动部件(300)与所述剪线活动刀(200)连接；
    所述驱动部件(300)驱动所述剪线活动刀(200)沿着所述缝纫机的长度方向在剪线工位和勾线工位之间移动；当所述剪线活动刀(200)移动到所述剪线工位时，所述固定刀刃口(101)与所述活动刀刃口(201)接触；当所述剪线活动刀(200)移动到所述勾线工位时，所述勾线槽(210)的所述勾线孔(211)移动到缝纫机的机针(20)的下方。
  2. 根据权利要求1所述的起缝剪线机构，其特征在于：所述剪线固定刀(100)上设有刀部导向槽(110)，所述刀部导向槽(110)的长度方向与所述缝纫机的长度方向同向；
    所述驱动部件(300)包括：
    固定设置的支撑轴(310)；
    传动叉(320)，所述传动叉(320)的一端与所述支撑轴(310)活动连接，所述传动叉(320)的另一端设有叉口(321)；
    固定销(330)，所述固定销(330)的上端插入于所述刀部导向槽(110)中，且与所述剪线活动刀(200)上远离所述活动刀刃口(201)的一端连接，所述固定销(330)的下端插入于叉口(321)中；
    传动杆(340)，所述传动杆(340)的一端与所述传动叉(320)的中部连接；
    驱动机构(350)，所述驱动机构(350)与所述传动杆(340)的另一端连接。
  3. 根据权利要求2所述的起缝剪线机构，其特征在于：
    所述驱动机构(350)包括：
    驱动源件(510)；
    曲柄(520)，所述曲柄(520)的一端与所述驱动源件(510)连接，所述驱动源件(510)带动所述曲柄(520)转动；
    中间滑动件(530)，包括沿着所述缝纫机的长度方向固定设置的承接轴(531)，所述承接轴(531)上设有传动滑杆(532)，所述传动滑杆(532)可沿着所述承接轴(531)滑动；所述传动滑杆(532)与所述曲柄(520)的另一端连接，且所述传动滑杆(532)与所述传动杆(340)的另一端连接。
  4. 根据权利要求3所述的起缝剪线机构，其特征在于：
    所述驱动机构(350)还包括两个固定设置的安装板(541)，所述承接轴(531)的两端分别与两个所述安装板(541)连接；
    所述传动滑杆(532)套在所述承接轴(531)上，一支撑弹簧(542)套设在所述承接轴(531)上，所述支撑弹簧(542)处于所述传动滑杆(532)与两个所述安装板(541)中的远离所述机针(20)的所述安装板(541)之间。
  5. 根据权利要求2所述的起缝剪线机构，其特征在于：
    所述驱动机构(350)包括：剪线刀驱动组件(550)、剪线限位组件(560)和固定设置的驱动件底座(570)；
    所述驱动件底座(570)上设有限位槽(571)，所述限位槽(571)的槽底面上设有导向通孔(572)，所述导向通孔(572)的长度方向与所述缝纫机的长度方向同向；
    所述剪线刀驱动组件(550)包括：
    剪线刀驱动元件(551)；
    驱动连杆(552)，与所述剪线刀驱动元件(551)的输出端连接，所述驱动连杆(552)的远离所述剪线刀驱动元件(551)的一端上设置挡件(553)；
    限位弹簧(554)，套设在所述驱动连杆(552)上，且处于所述挡件(553)与所述剪线刀驱动元件(551)之间；
    传动部件(555)，活动安装于所述驱动件底座(570)上，且所述传动部件(555)与所述驱动连杆(552)连接；
    驱动销(556)，所述驱动销(556)的一端与所述传动部件(555)连接；所述驱动销(556)的另一端穿过所述导向通孔(572)，与所述传动杆(340)的另一端连接；
    所述剪线限位组件(560)包括：
    限位驱动元件(561)；
    限位板件(562)，所述限位板件(562)与所述限位驱动元件(561)的输出端连接，所述限位板件(562)上设有供所述驱动销(556)插入的限位通孔(563)。
  6. 根据权利要求5所述的起缝剪线机构，其特征在于：
    所述传动部件(555)包括：
    传动连杆(557)，铰接于所述驱动件底座(570)上，所述传动连杆(557)的一端与所述驱动连杆(552)连接，所述驱动销(556)的一端与所述传动连杆(557)连接；
    驱动块(558)，设置于所述限位槽(571)中，所述驱动销(556)与所述驱动块(558)连接，所述驱动块(558)可在所述限位槽(571)中移动。
  7. 根据权利要求6所述的起缝剪线机构，其特征在于：
    所述限位板件(562)包括限位连接杆(564)和限位推板(565)；所述限位连接杆(564)的一端与所述限位驱动元件(561)连接，所述限位连接杆(564)的另一端与所述限位推板(565)的一端连接，所述限位推板(565)的另一端处于所述传动连杆(557)与所述驱动块(558)之间，所述限位通孔(563)设置于所述限位推板(565)上；
    所述剪线限位组件(560)还包括：放置于所述驱动件底座(570)上的限位块(566)和安装于所述驱动件底座(570)上的纽簧件(567)，所述纽簧件(567)的一端与所述限位块(566)连接；所述限位块(566)与 所述驱动块(558)的靠近所述机针(20)的一侧接触。
  8. 根据权利要求7所述的起缝剪线机构，其特征在于：还包括设置于所述剪线活动刀(200)下方的吸气装置(400)；所述勾线槽(210)上设有排线孔(212)，所述排线孔(212)处于所述勾线孔(211)与所述活动刀刃口(201)之间；当所述剪线活动刀(200)移动到所述剪线工位时，所述吸气装置(400)的吸气口(410)处于所述排线孔(212)的下方。
  9. 一种起缝剪线方法，采用如权利要求1-8中任意一项所述的起缝剪线机构，其特征在于：包括以下步骤：
    1)所述驱动部件(300)驱动所述剪线活动刀(200)移动到勾线工位后，缝纫机的机针(20)运动，所述机针(20)上穿设的缝线的线头穿过针板落针孔进入勾线槽(210)的勾线孔(211)中，随后，所述机针(20)开始回升，机针(20)上的所述缝线的线头处于所述勾线孔(211)的底部，所述机针(20)继续回升，直到缝纫机的挑线杆收线到最高点；
    2)所述驱动部件(300)驱动所述剪线活动刀(200)移动到所述剪线工位与所述勾线工位之间的起缝工位；当所述剪线活动刀(200)处于起缝工位时，所述剪线活动刀(200)的勾线槽(210)的勾线孔(211)从所述机针(20)的下方移开，所述固定刀刃口(101)与所述活动刀刃口(201)不咬合，所述缝线的线头位于所述剪线固定刀(100)与所述剪线活动刀(200)之间不切断；所述缝纫机的机针(20)运动，缝制1针或2针；
    3)所述驱动部件(300)驱动所述剪线活动刀(200)移动到剪线工位，所述固定刀刃口(101)与所述活动刀刃口(201)咬合，切断所述缝线的线头；
    4)所述缝纫机的机针(20)继续运转，进行缝纫。
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