阅读说明：本技术 一种纱线打结器 (Yarn knotter ) 是由 丁彩红 谢钦林 李梁 杨柳 伍鸣督 于 2020-05-19 设计创作，主要内容包括：本发明设计一种纱线打结器,包括夹绳部件、打结部件、牵引部件、传动部件。新旧纱线筒的纱线头分别被气动手指夹持,由滑动支架牵引,被下罩盖与上罩盖夹紧,完成纱线的牵引与夹持。在传动组件的驱动下,打结嘴钳与打结钩钳完成旧纱线的绕线动作,在气缸驱动下,绳钩完成新纱线的钩取动作。齿盘构件张紧纱线实现成结与脱钩动作。本发明的优点：实现纱线打结的自动化,解决了纱线结结头松弛与线尾过长的问题,提高了纱线打结的速度与质量以及纱线筒更换的效率。(The invention designs a yarn knotter which comprises a rope clamping part, a knotting part, a traction part and a transmission part. The yarn ends of the new yarn cylinder and the old yarn cylinder are respectively clamped by a pneumatic finger, pulled by the sliding support and clamped by the lower cover cap and the upper cover cap to finish the pulling and clamping of the yarns. Under the drive of the transmission component, the knotting mouth clamp and the knotting hook clamp complete the winding action of the old yarn, and under the drive of the cylinder, the rope hook completes the hooking action of the new yarn. The fluted disc member tensions the yarn to effect the tying and unthreading actions. The invention has the advantages that: the automatic knotting of the yarns is realized, the problems of loose knotted ends and overlong tail ends of the yarns are solved, and the knotting speed and quality of the yarns and the replacement efficiency of yarn bobbins are improved.)

1. A yarn knotter is characterized by comprising a frame (21), a rope clamping part, a knotting part, a transmission part, a traction part, a new yarn bobbin (22) and an old yarn bobbin (23);

the rope clamping component comprises an end cover (1), an upper cover (2), a lower cover (3) and a cylinder (4), wherein the end cover (1) is horizontally fixed at the top of the rack (21), the upper cover (2) is arranged below the end cover (1), the lower cover (3) is arranged below the upper cover (2) in a non-contact and coaxial mode, the bottom of the lower cover (3) is fixedly connected with a piston rod of the vertically-arranged cylinder (4), the cylinder (4) is fixed at the bottom of the rack (21), the bottom of the upper cover (2) and the top of the lower cover (3) are the same oblique section of a cylindrical surface with the same diameter, and the oblique section at the top is attached to the oblique section at the bottom of the upper cover (2) when the lower cover (3) moves upwards to a limit position; two cams are arranged on the oblique section of the bottom of the upper cover cap (2); the oblique section of the top of the lower cover (3) is provided with two grooves comprising a first groove (301) and a second groove (302), and is also provided with two rope clamping notches comprising a first rope clamping notch (303) and a second rope clamping notch (304);

the knotting component comprises a knotting mouth shaft (5), knotting mouth pliers (6), knotting hook pliers (7), a rope hook (8), a ratchet ring (9) and a blade, the top end of the knotting mouth shaft (5) is supported by a thrust ball bearing arranged on the end cover (2), the bottom of the knotting mouth shaft (5) is fixedly connected with the knotting mouth pliers (6), the knotting mouth pliers (6) is connected with the knotting hook pliers (7) through a pin shaft, the knotting hook pliers (7) can rotate around the pin shaft, the ratchet ring (9) is fixedly connected with the end cover (1), and the shaft hole of the ratchet ring (9) and the knotting mouth shaft (5) are installed coaxially in a non-contact mode; the rope hook (8) is arranged at the bottom of the lower cover cap (3), and the rope hook (8) is driven by the cylinder to do rotary motion in a vertical plane; the blades comprise a first blade (10) and a second blade (11), the first blade (10) is arranged at the position of a second rope clamping notch (304), the blade front surface of the first blade is overlapped with the notch, and the second blade (11) is arranged on the inner side of the cylindrical surface of the lower cover cap (3);

the transmission component comprises a fluted disc (16), a rotary bearing, a transmission gear, a driving gear (19) and a knotting transmission shaft (20); a knotting driving incomplete internal gear (1603), a yarn traction rod and a knotting hook clamp driving rod (1604) are arranged on the fluted disc (16); the slewing bearing comprises a slewing bearing inner ring (1701) and a slewing bearing outer ring (1702), the slewing bearing inner ring (1701) and the upper cover (2) are coaxially and fixedly installed, a gear of the slewing bearing outer ring (1702) is meshed with the driving gear (19), a fluted disc (16) and the slewing bearing outer ring (1702) are coaxially and fixedly installed, and the top end of the knotting transmission shaft (20) is supported by a thrust ball bearing arranged on the end cover (1); the transmission gear comprises a first transmission gear (1801) and a second transmission gear (1802), the first transmission gear (1801) is fixed to the middle section of the knotting nozzle shaft (5) through a pin shaft, the second transmission gear (1802) is fixedly connected to the bottom end of the knotting transmission shaft (20) through a pin shaft, the first transmission gear (1801) is meshed with the second transmission gear (1802), and the second transmission gear (1802) is meshed with an incomplete internal gear (1603) on the inner side of a fluted disc; the knotting driving incomplete internal gear (1603) is positioned on the inner side of the fluted disc (16), and the initial position is a position where a tooth surface is to be in contact with a tooth surface of the second transmission gear (1802); the two yarn traction rods are arranged perpendicular to the bottom of the fluted disc (16), the length of the first yarn traction rod (1601) is from the bottom of the fluted disc (16) to the first groove (301), the length of the second yarn traction rod (1602) is from the bottom of the fluted disc (16) to the second groove (302), when the fluted disc (16) rotates to the position where the knotting driving incomplete internal gear (1603) is disengaged from the second transmission gear (1802), the first yarn traction rod (1601) rotates to the position close to the first groove (301), when the fluted disc (16) drives the first yarn traction rod (1601) to continue rotating for 50 degrees from the position of the first groove (301), the second yarn traction rod (1602) rotates to the position of the second groove (302), the knotting hook clamp driving rod is arranged at the bottom of the fluted disc and perpendicular to the axis of the fluted disc, and when the second yarn traction rod (1602) rotates to the position of the second groove (302), the knotting hook clamp driving rod (1604) is tangent to the top arc surface of the knotting hook clamp (7) and can press down the top of, when the fluted disc (16) drives the second yarn traction rod (1602) to continue to rotate for 10 degrees from the second groove (302), the outer side surface of the first yarn traction rod (1601) is contacted with the second blade (11); a knotting mouth clamp notch (601) is formed in the mouth tip of the knotting mouth clamp (6), a notch is also formed in the knotting hook clamp (7) corresponding to the notch of the knotting mouth clamp (6), the knotting mouth clamp notch (601) is used for the rope hook (8) to pass through when rotating, two circular arc surfaces are arranged at the top of the knotting hook clamp (7), the circular arc surface at the top is tangent to the bottom surface of a knotting hook clamp driving rod (1604), and the other circular arc surface is contacted with the outer profile surface of the ratchet ring (9); the rope hook (8) is driven by the cylinder, the rotating range is 165 degrees, a hook groove for hooking yarns is formed in the top end of the rope hook (8), and when the rope hook (8) rotates to the limit position, the rope hook groove (801) moves to be located on a yarn traction path of the new yarn bobbin (22);

the traction part comprises a sliding support (13), a pneumatic finger and a support guide rail (12), the support guide rail (12) is arranged below the end cover (1), the sliding support (13) is arranged in a slide way of the support guide rail (12), and the sliding support (13) is driven by a screw rod to move back and forth along the slide way; the pneumatic fingers comprise a first pneumatic finger (14) and a second pneumatic finger (15) which are fixedly connected with the sliding support (13); the first pneumatic finger (14) clamps the end of the old yarn bobbin (23) and the second pneumatic finger (15) clamps the end of the new yarn bobbin (22).

Technical Field

The invention relates to a yarn knotter for connecting new and old yarns in a carpet weaving process, in particular to an automatic yarn knotter for replacing a yarn drum, and belongs to the technical field of carpet weaving.

Background

In the process of weaving the carpet, when the yarn drum is used up, a new yarn end and an old yarn end are knotted, so that the two yarns are connected front and back to continue working. The yarn connection mode comprises the traditional mechanical knotting, glue solution bonding, hot melting connection and air splicing. The glue solution bonding needs to be matched with the selection of the glue solution of the yarns and has lower knot forming speed; hot melt joining is commonly used for joints of synthetic fibers and has low joining strength; the air splicing auxiliary equipment is more, the maintenance and repair cost is higher, the air splicing device is suitable for thinner yarns, and the splicing effect on rough yarns is poor. The traditional mechanical knotting is suitable for most yarns and is firmly knotted, the knotted types comprise cone knots, flat knots, woven fabric knots and self-tightening knots, wherein the woven fabric knots are small and firm, are not easy to remove knots, and are suitable for different types of yarns. The existing knotter for weaving cloth knots is a GU102-A series knotter for weaving cloth knots in Shanghai textile hardware II factory, but the product is not suitable for thicker yarns such as carpet yarns.

Disclosure of Invention

The invention aims to solve the technical problem that new and old yarn ends are knotted when a creel is used for replacing a yarn barrel.

In order to solve the technical problems, the technical scheme of the invention is to provide a yarn knotter, in particular to an automatic knotting device which connects yarns by knots of woven fabric knots, has the characteristics of compact structure, accurate and reasonable movement, low manufacturing cost and reliable knot formation, and is characterized by comprising a frame, a rope clamping part, a knotting part, a traction part, a transmission part, a new yarn bobbin and an old yarn bobbin;

the rope clamping component comprises an end cover, an upper cover cap, a lower cover cap and a cylinder, wherein the end cover is horizontally fixed at the top of the rack, the upper cover cap is arranged below the end cover, the lower cover cap is arranged below the upper cover cap in a non-contact and coaxial manner, the bottom of the lower cover cap is fixedly connected with a piston rod of the vertically-placed cylinder, the cylinder is fixed at the bottom of the rack, the bottom of the upper cover cap and the top of the lower cover cap are the same oblique section of a cylindrical surface with the same diameter, and the oblique section of the top is attached to the oblique section of the bottom of the upper cover cap when the lower cover cap moves upwards; two cams are arranged on the oblique section at the bottom of the upper cover; the oblique section of the top of the lower cover cap is provided with two grooves comprising a first groove and a second groove, and is also provided with two rope clamping notches comprising a first rope clamping notch and a second rope clamping notch;

the knotting component comprises a knotting mouth shaft, knotting mouth pliers, knotting hook pliers, a rope hook, a ratchet ring and a blade, the top end of the knotting mouth shaft is supported by a thrust ball bearing arranged on an end cover, the bottom of the knotting mouth shaft is fixedly connected with the knotting mouth pliers, the knotting mouth pliers are connected with the knotting hook pliers through a pin shaft, the knotting hook pliers can rotate around the pin shaft, the ratchet ring is fixedly connected with the end cover, and a shaft hole of the ratchet ring and the knotting mouth shaft are in non-contact and coaxial installation; the rope hook is arranged at the bottom of the lower cover cap and is driven by the cylinder to do rotary motion in a vertical plane; the blades comprise a first blade and a second blade, the first blade is arranged at the position of the second rope clamping groove, the blade front surface of the first blade is overlapped with the groove opening, and the second blade is arranged on the inner side of the cylindrical surface of the lower cover cap;

the transmission part comprises a fluted disc, a rotary bearing, a transmission gear, a driving gear and a knotting transmission shaft; the fluted disc is provided with a knotting driving incomplete internal gear, a yarn draw bar and a knotting hook clamp driving rod; the rotary bearing comprises a rotary bearing inner ring and a rotary bearing outer ring, the rotary bearing inner ring and the upper cover are coaxially and fixedly installed, a rotary bearing outer ring gear is meshed with the driving gear, a fluted disc and the rotary bearing outer ring are coaxially and fixedly installed, and the top end of the knotting transmission shaft is supported by a thrust ball bearing arranged on the end cover; the transmission gear comprises a first transmission gear and a second transmission gear, the first transmission gear is fixed at the middle section of the knotting nozzle shaft through a pin shaft, the second transmission gear is fixedly connected to the bottom end of the knotting transmission shaft through a pin shaft, the first transmission gear is meshed with the second transmission gear, and the second transmission gear is internally meshed with an incomplete internal gear on the inner side of the fluted disc; the knotting driving incomplete internal gear is positioned on the inner side of the fluted disc, and the initial position is the position where the tooth surface is about to contact with the tooth surface of the second transmission gear; the two yarn traction rods are arranged perpendicular to the bottom of the fluted disc, the length of the first yarn traction rod is from the bottom of the fluted disc to the first groove, the length of the second yarn traction rod is from the bottom of the fluted disc to the second groove, when the fluted disc rotates to knot and drives the incomplete internal gear to be disengaged from the second transmission gear, the first yarn traction rod rotates to be close to the first groove, when the fluted disc drives the first yarn traction rod to continue rotating for 50 degrees from the first groove, the second yarn traction rod rotates to the second groove, the knotting hook clamp driving rod is arranged at the bottom of the fluted disc and is vertical to the axis of the fluted disc, when the second yarn traction rod rotates to the second groove, the driving rod of the knotting hook clamp is tangent with the arc surface at the top of the knotting hook clamp and can press the top of the knotting hook clamp downwards, when the fluted disc drives the second yarn traction rod to continue to rotate for 10 degrees from the second groove, the outer side surface of the first yarn traction rod is contacted with the second blade; the tip of the knotting jaw forceps is provided with a knotting jaw forceps notch, the knotting hook forceps is also provided with a notch corresponding to the knotting jaw forceps notch, the knotting jaw forceps notch is used for a rope hook to pass through when rotating, the top of the knotting hook forceps is provided with two arc surfaces, the arc surface at the top is tangent to the bottom surface of a driving rod of the knotting hook forceps, and the other arc surface is contacted with the outer contour surface of the ratchet ring; the rope hook is driven by the cylinder, the rotating range is 165 degrees, a hook groove for hooking and taking yarns is formed in the top end of the rope hook, and when the rope hook rotates to the limit position, the rope hook groove moves to be located on a yarn traction path of a new yarn bobbin;

the traction part comprises a sliding support, a pneumatic finger and a support guide rail, the support guide rail is arranged below the end cover, the sliding support is arranged in a slideway of the support guide rail, and the sliding support is driven by a screw rod to move back and forth along the slideway; the pneumatic fingers comprise a first pneumatic finger and a second pneumatic finger which are fixedly connected with the sliding support; the first pneumatic finger clamps the yarn end of the old yarn bobbin, and the second pneumatic finger clamps the yarn end of the new yarn bobbin.

In conclusion, the beneficial effects of the invention are as follows:

1. the automation of yarn traction and clamping is solved, and the knotting efficiency is improved.

2. The blade is installed inside the knotter, further shortens the end of a thread of knot, promotes knot quality.

3. The automation of yarn knotting and yarn tube replacement is realized, and the speed of yarn tube replacement is accelerated.

Drawings

FIG. 1 is an isometric view of a knotter assembly;

FIG. 2 is a side view of the knotter assembly;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is a cross-sectional view B-B of FIG. 3;

FIG. 5 is a schematic view of a knotting nozzle of the knotter;

FIG. 6 is a schematic view of a fluted disc structure of the knotter;

FIG. 7 is a schematic view of a string hook structure of the knotter;

FIG. 8 is a schematic structural view of a lower housing of the knotter;

FIGS. 9-14 are diagrammatic views of knotter steps;

description of reference numerals: 1. an end cap; 2. an upper cover; 3. a lower cover; 301. a first groove; 302. a second groove; 303. a first cord-gripping notch; 304 a second cord grasping notch; 4. a cylinder; 5 knotting the nozzle shaft; 6. knotting a mouth clamp; 601. knotting the notch of the mouth clamp; 7. knotting hook forceps; 8. a rope hook; 801. a rope hook groove; 9. a ratchet ring; 10. a first blade; 11. a second blade; 12. a bracket guide rail; 13. a sliding support; 14. a first pneumatic finger; 15. a second pneumatic finger; 16. a fluted disc; 1601. a first yarn draw bar; 1602. a second yarn draw bar; 1603. knotting drives an incomplete internal gear; 1604. a knotting hook clamp driving rod; 1701. a slew bearing outer race; 1702. an inner race of a slew bearing; 1801. a first drive gear; 1802. a second transmission gear; 19. a drive gear; 20. knotting the transmission shaft; 21. a frame; 2101. a frame guide rod; 22. a new bobbin; 23. an old bobbin of yarn.

Detailed Description

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

The present invention will be described in further detail with reference to the following detailed description of the drawings, but the scope of the present invention is not limited thereto. In the present embodiment, the air tube and the electric wire are not shown in all the figures for clarity of illustration, but as a general knowledge, all the pneumatic elements or electric elements of the present invention are led out by a common or suitable method.

The invention relates to a yarn knotter, as shown in figures 1 and 2, a rope clamping part comprises an end cover 1, an upper cover cap 2, a lower cover cap 3 and a cylinder 4, the end cover 1 is horizontally fixed at the top of a frame 21, the upper cover cap 2 is fixedly arranged below the end cover 1, the lower cover cap 3 is arranged below the upper cover cap 2 in a non-contact coaxial manner, the bottom of the lower cover cap 3 is fixedly connected with a piston rod of the vertically arranged cylinder 4, a cylinder body of the cylinder 4 is fixed at the bottom of the frame 21, the bottom of the upper cover cap 2 and the top of the lower cover cap 3 are the same inclined section of a cylindrical surface with the same diameter, and the inclined section of the top is attached to the inclined section of the bottom of the upper cover cap 2 when the lower.

As shown in fig. 3 and 4, the transmission part comprises a fluted disc 16, a slewing bearing, a transmission gear, a driving gear 19 and a knotting transmission shaft 20, wherein the slewing bearing comprises two parts, an inner ring 1701 of the slewing bearing is coaxially and fixedly installed with the upper cover 2, an outer ring 1702 gear of the slewing bearing is meshed with the driving gear 19, the fluted disc 16 is coaxially and fixedly installed with an outer ring 1702 of the slewing bearing, the top end of the knotting transmission shaft 20 is supported by a thrust ball bearing installed on the end cover 1, the transmission gear comprises two parts, a first transmission gear 1801 is fixed at the middle section of the knotting nozzle shaft 5 through a pin shaft, a second transmission gear 1802 is fixedly connected to the bottom end of the knotting transmission shaft 20 through a pin shaft, the first transmission gear 1801 is meshed with the second transmission gear;

as shown in fig. 4, 5, 6 and 7, the knotting component comprises a knotting nozzle shaft 5, knotting nozzle pliers 6, knotting hook pliers 7, a rope hook 8, a ratchet ring 9 and a blade, wherein the top end of the knotting nozzle shaft 5 is supported by a thrust ball bearing mounted on an end cover 2, the bottom of the knotting nozzle shaft 5 is fixedly connected with the knotting nozzle pliers 6, the knotting nozzle pliers 6 is connected with the knotting hook pliers 7 through a pin shaft, the knotting hook pliers 7 can rotate around the pin shaft, the ratchet ring 9 is fixedly connected with the end cover 1, and the shaft hole of the ratchet ring 9 and the shaft 5 are in non-contact coaxial installation.

As shown in fig. 8, the rope hook 8 is installed at the bottom of the lower cover cap 3, the cylinder drives the rope hook 8 to make a rotation movement in a vertical plane, the blade includes two pieces, the first blade 10 is installed at the second rope clamping groove opening 304, the blade front surface overlaps with the groove opening, and the second blade 11 is installed at the inner side of the cylindrical surface of the lower cover cap 3.

As shown in fig. 9, the traction component includes a sliding support 13, pneumatic fingers, and a support guide rail 12, the support guide rail 12 is disposed below the end cover 1, the sliding support 13 is installed in a slide way of the support guide rail 12, the sliding support 13 is driven by a screw rod to move back and forth along the slide way, the pneumatic fingers include two fingers, both of which are fixedly connected with the sliding support 13, the first pneumatic finger 14 clamps the yarn end of an old yarn bobbin 23, and the second pneumatic finger 15 clamps the yarn end of a new yarn bobbin 22;

as shown in fig. 1, 4 and 7, two cams are arranged on the oblique section of the bottom of the upper cover 2, two grooves are arranged on the oblique section of the top of the lower cover 3, which are a first groove 301 and a second groove 302, the upper cover cam is engaged with the lower cover groove, and the grooves and the cams are located on the yarn drawing path of the old yarn bobbin.

As shown in fig. 3, 4 and 6, the toothed disc 16 is provided with a knotting driving incomplete internal gear 1603, a yarn pulling rod and a knotting pincer driving rod 1604, the knotting driving incomplete internal gear 1603 is located inside the toothed disc 16, an initial position is a position where a tooth surface is about to contact with a tooth surface of the second transmission gear 1802, the yarn pulling rod has two pieces and is arranged perpendicular to the bottom of the toothed disc 16, the length of the first yarn pulling rod 1601 is from the bottom of the toothed disc 16 to the first groove 301, the length of the second yarn pulling rod 1602 is from the bottom of the toothed disc 16 to the second groove 302, when the toothed disc 16 rotates to the point where the knotting driving incomplete internal gear 1603 is disengaged from the second transmission gear 1802, the first yarn pulling rod 1601 rotates to be close to the first groove 301, when the toothed disc 16 drives the first yarn pulling rod 1601 to continue to rotate by 50 ° from the first groove 301, the second yarn pulling rod 1602, perpendicular to the axis of the fluted disc, when the second yarn traction rod 1602 rotates to the second groove 302, the knotting pincer driving rod 1604 is tangent to the arc surface at the top of the knotting pincer 7 and can press down the top of the knotting pincer 7, and when the fluted disc 16 drives the second yarn traction rod 1602 to continue to rotate 10 degrees from the second groove 302, the outer side surface of the first yarn traction rod 1601 is in contact with the second blade 11; as shown in fig. 5, a notch is formed at the tip of the knotting pincer 6, a notch is also formed at the knotting hook pincer 7 corresponding to the notch of the knotting pincer 6, the knotting pincer notch 601 allows the rope hook 8 to pass through when rotating, two arc surfaces are formed at the top of the knotting hook pincer 7, the arc surface at the top is tangent to the bottom surface of the driving rod 1604 of the knotting pincer, and the other arc surface is in contact with the outer profile surface of the ratchet ring 9; as shown in fig. 9, the rope hook 8 is driven by the air cylinder, the rotation range is 165 degrees, the top end of the rope hook 8 is provided with a hook groove for hooking the yarn, and when the rope hook 8 rotates to the extreme position, the rope hook groove 801 moves to be positioned on the yarn traction path of the new yarn bobbin.

When the invention works, the concrete working steps are as follows:

the method comprises the following steps: as shown in fig. 9 and 10, the yarn end of the new bobbin 22 is held by the second pneumatic finger 15, the yarn end of the old bobbin 23 is held by the first pneumatic finger 14, and the slide holder 13 slides backward to pull and stretch both yarns. The cylinder 4 pushes the lower cover cap 3 to ascend along the guide rod 2101 of the rack, the old yarn passes through the first groove 301 and the second groove 302, the knotting mouth clamp 6 presses the old yarn downwards and slides to the position above the knotting hook clamp 7 along the bottom inclined plane of the old yarn, the inclined section at the bottom of the upper cover cap 2 is meshed with the inclined section at the top of the lower cover cap 3, the old yarn is clamped in the first groove 301 and the second groove 302, and the new yarn passes through the first rope clamping notch 303 and the second rope clamping notch 304 and is tensioned. And finishing the yarn traction and clamping links.

Step two: as shown in fig. 11, the driving gear 19 is driven by the motor to rotate the outer ring 1701 of the slewing bearing, and further to rotate the toothed disc 16, the second transmission gear 1802 and the first transmission gear 1801. Knotting mouth shaft 5 follows first drive gear 1801 and rotates, drives knotting mouth pincers 6 and rotates, draws old yarn winding knotting mouth pincers 6 a week. In the process, the top cylindrical surface of the knotting hook clamp 7 is always in contact with the outer contour surface of the ratchet ring 9, the knotting hook clamp 7 is pushed to rotate around the pin shaft, the knotting mouth clamp 6 and the knotting hook clamp 7 are in an open state, and the knotting mouth clamp 7 instantly falls back until the knotting mouth shaft 5 returns to the original position after completing a circle of rotation, and is in a closed state with the knotting mouth clamp 6 again to hook old yarns. The toothed disc 16 continues to rotate, but the knotting nozzle does not completely drive the internal gear 1603 out of engagement with the second transmission gear 1802, and the knotting nozzle tong 6 stops rotating. The fluted disc 16 drives the first yarn traction rod 1601 to rotate and push the old yarn at the second groove 302, and further drives the yarn loop wound on the knotting pincer 6 to be separated from the knotting pincer 6, thereby forming a knot loop.

Step three: as shown in fig. 12 and 13, after the knot ring is formed, the cord hook 8 rotates to pass through the groove opening of the knotting nozzle clamp, the new yarn can smoothly pass through the knot ring, the cord hook groove 801 hooks the new yarn between the first cord clamping groove opening 303 and the second cord clamping groove opening 304, the new yarn is driven to pass through the knot ring by the rotation of the cord hook 8, the end of the new yarn is close to the first blade 10 until the new yarn is cut off during the rotation of the cord hook 8, and the cord hook 8 rotates to the initial position to pull the end of the new yarn to pass through the knot ring. And finishing the knot forming link of the two yarns.

Step four: as shown in fig. 14, the knotting pincer driving rod 1604 presses down the top of the knotting pincer 7 to rotate the knotting pincer 7 around the pin shaft, so that the knotting pincer 6 and the knotting pincer 7 are in an open state to completely loosen the old yarn, the gear disc 16 continues to rotate, the second yarn traction rod pushes the old yarn in the first groove 301, the first yarn traction rod continues to push the old yarn in the second groove 302 to tension the old yarn, and the knotting ring is contracted. The fluted disc 16 rotates until the old yarn is in a completely tensioned state, the knot ring is locked, and meanwhile, the first yarn traction rod 1601 is matched with the second blade 11 to cut off the old yarn end. Then the lower cover 3 descends, the old yarn cylinder 23 is taken down from the creel support, the new yarn cylinder 22 is taken down from the yarn cylinder support of the end cover 1 and then is placed on the creel support, and the replacing link of the yarn cylinder is completed.

It should be understood that this example is only for illustrating the present invention and is not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.