阅读说明：本技术 调线头 (Wire adjusting head ) 是由 张志勇 张镇宏 于 2019-10-22 设计创作，主要内容包括：本发明涉及一种调线头。包括基座、及一组以上的调线机构,每组调线机构包括纱嘴板及与纱嘴板相配合设置的剪刀组件,剪刀组件的后端设有与第一槽孔相匹配的第一销轴,剪刀组件后端的第一销轴与纱嘴板后端的第一槽孔相配合连接,剪刀组件的前端通过导向组件与基座相连接；调线头还包括连接于基座和纱嘴板之间的第一复位组件；调线头还包括用于带动剪刀组件松开或剪断纱线的驱动装置。本发明的调线头启用新型的调线机构,不但能稳定地为织针机上的织针调换纱线,而且还可以在纱线编织结束时夹紧并剪断纱线为后续调线工作做准备。(The invention relates to a wire turning head. The thread adjusting mechanism comprises a base and more than one group of thread adjusting mechanisms, each group of thread adjusting mechanisms comprises a yarn nozzle plate and a scissors assembly matched with the yarn nozzle plate, a first pin shaft matched with a first groove hole is arranged at the rear end of the scissors assembly, the first pin shaft at the rear end of the scissors assembly is matched and connected with the first groove hole at the rear end of the yarn nozzle plate, and the front end of the scissors assembly is connected with the base through a guide assembly; the yarn adjusting head also comprises a first reset component connected between the base and the yarn nozzle plate; the yarn adjusting head also comprises a driving device for driving the scissors assembly to loosen or cut the yarn. The yarn changing head of the invention starts a novel yarn changing mechanism, not only can stably change yarns for knitting needles on a knitting machine, but also can clamp and cut the yarns when the yarns are knitted to prepare for subsequent yarn changing work.)

1. A wire turning head is characterized in that: the thread adjusting device comprises a base (1) and more than one group of thread adjusting mechanisms (2) arranged on the base (1), wherein each group of thread adjusting mechanisms (2) comprises a yarn nozzle plate (21) and a scissors assembly (22) matched with the yarn nozzle plate (21), a yarn penetrating hole (211) is formed in the front end of the yarn nozzle plate (21), the free end of a yarn (A) penetrates through the yarn penetrating hole (211) and then is clamped and fixed on the scissors assembly (22), the yarn nozzle plate (21) is connected to the base (1) in a sliding mode and can slide back and forth relative to the base (1), a first groove hole (212) extending in the back and forth direction is formed in the rear end of the yarn nozzle plate (21), a first pin shaft (221) matched with the first groove hole (212) is formed in the rear end of the scissors assembly (22), the first pin shaft (221) in the rear end of the scissors assembly (22) is matched and connected with the first groove hole (212) in the rear end of the yarn nozzle plate (21), the front end of the scissors assembly (22) is connected with the base (1) through the guide assembly (3);

the yarn adjusting head further comprises a first driving component (4) which is connected between the base (1) and the yarn nozzle plate (21) and used for pushing the yarn nozzle plate (21) to slide forwards relative to the base (1), and a first resetting component (5) which is connected between the base (1) and the yarn nozzle plate (21) and used for driving the yarn nozzle plate (21) to reset backwards; the first slotted hole (212) in the yarn mouth plate (21) can push a first pin shaft (221) in the scissors assembly (22) to drive the scissors assembly (22) to move forwards and backwards, the scissors assembly (22) can be opened downwards relative to the yarn mouth plate (21) through the first pin shaft (221) under the action of the guide assembly (3) when moving forwards, and the scissors assembly (22) can be driven to be closed upwards and reset relative to the yarn mouth plate (21) under the action of the guide assembly (3) when moving backwards; the yarn adjusting head also comprises a driving device (6) for driving the scissors assembly (22) to loosen or cut the yarn (A).

2. The thread trimmer head of claim 1, wherein: the scissors assembly (22) comprises a scissors fixing piece (222), a yarn clamping plate (223) which is fixedly connected with the scissors fixing piece (222) and is positioned between the scissors fixing piece (222) and the yarn nozzle plate (21), and a scissors moving piece (224) which is connected between the scissors fixing piece (222) and the yarn clamping plate (223) in a front-back sliding mode; the first pin shaft (221) is fixedly arranged at the rear end of the scissors fixing piece (222), and the guide assembly (3) comprises a first guide groove (31) arranged at the front end of the scissors fixing piece (222) and a first guide rod (32) fixedly arranged on the base (1) and used for being matched with the first guide groove (31);

a first arc-shaped groove (2231) with an opening at the upper part is arranged at the front end part of the yarn clamping plate (223), and a second arc-shaped groove (2221) with an opening at the upper part is arranged at the position, corresponding to the first arc-shaped groove (2231), at the front end part of the scissors fixing piece (222); in an initial state, the free end of the yarn (A) passes through the first arc-shaped groove (2231) and then is fixedly clamped between the two side walls of the yarn clamping plate (223) and the scissors moving piece (224);

the rear end of the scissors moving piece (224) is provided with a first bump (2241) extending downwards, the driving device (6) comprises a pushing piece (61) which is connected to the base (1) in a sliding manner and is positioned below the scissors assembly (22), a second driving assembly (62) which is connected between the pushing piece (61) and the base (1) and is used for pushing the pushing piece (61) to slide, and a second resetting assembly (63) which is connected between the pushing piece (61) and the base (1) and is used for driving the pushing piece (61) to reset; the pushing piece (61) can push the first lugs (2241) on all the scissors assemblies (22) in an open state backwards for a certain distance, and then the second resetting assembly (63) drives the pushing piece (61) to reset, so that the scissors moving piece (224) can slide backwards relative to the scissors fixing piece (222) to release the yarn (A); in the resetting process that the scissor component (22) is closed upwards relative to the yarn mouth plate (21), the first arc-shaped groove (2231) and the second arc-shaped groove (2221) on the scissor component (22) can hook back the yarn (A) hooked away by the knitting needle (B); the base (1) is provided with a limiting surface (11) used for limiting the backward movement limit position of the scissors moving piece (224); a second bump (213) extending downwards is arranged on the yarn nozzle plate (21); the cutting edge (2242) is arranged at the foremost part of the scissors moving piece (224), the scissors moving piece (224) stops moving backwards when a first bump (2241) on the scissors moving piece (224) touches the limiting surface (11) in the resetting process of the scissors moving piece (224), and the pushing piece (61) can push a second bump (213) on the yarn nozzle plate (21) backwards for a distance and then is driven by the second resetting component (63) to reset when the scissors moving piece (224) stops moving, so that the scissors fixing piece (222) slides backwards relative to the scissors moving piece (224) to clamp and cut off the yarn (A).

3. The thread trimmer head of claim 2, wherein: the first guide groove (31) comprises a first groove (311), a second groove (312) and a third groove (313) which are in arc transition connection in sequence; the first groove (311) is horizontally arranged along the front-back direction, the second groove (312) is arranged in a mode of inclining upwards and backwards, and the third groove (313) is arranged in a mode of inclining downwards and backwards; the scissors fixing piece (222) and the yarn clamping plate (223) are fixedly connected through more than two second pin shafts (225); and a second slotted hole (2243) which is matched with the second pin shaft (225) in number and position and extends along the front-back direction is formed in the scissors moving piece (224).

4. The yarn changing head as claimed in claim 3, wherein: the yarn mouth plate (21) is provided with a push block (214), the scissors fixing piece (222) is provided with a protruding piece (2222) which is located in front of the push block (241) and extends upwards, and when the yarn mouth plate (21) moves forwards, the push block (214) can push the protruding piece (2222) to drive the scissors assembly (22) to move forwards, so that the first guide rod (32) enters the groove II (312) from the groove I (311).

5. The thread trimmer head of claim 2, wherein: the pushing piece (61) comprises two connecting rods (611) which are arranged at the left side and the right side of the base (1) and extend along the front-back direction, and two connecting shafts (612) which are vertically connected between the two connecting rods (611); the side walls of the left side and the right side of the base (1) are provided with second guide grooves (12); the second guide groove (12) comprises a first guide groove (121) and a second guide groove (122) which are in arc transition connection in sequence; the first guide groove (121) and the second guide groove (122) are inclined upwards and backwards, and the inclination of the second guide groove (122) is smaller than that of the first guide groove (121); wherein both ends about connecting axle (612) that are located the place ahead cooperate respectively to be connected in two second guide way (12), second drive assembly (62) are for setting up on base (1) and the second cylinder that is located between the connecting axle (612) at rear, second reset assembly (63) are for connecting base (1) and the second extension spring that is located between the connecting axle (612) at rear.

6. The thread trimmer head of claim 1, wherein: first drive assembly (4) are for setting up in accent line mechanism (2) top and connect and be used for promoting the gliding first cylinder of yarn mouth board (21) between base (1) and yarn mouth board (21), first subassembly (5) that reset is for connecting in the first extension spring between base (1) and yarn mouth board (21).

7. The thread trimmer head of claim 2, wherein: the scissors assembly (22) further comprises an elastic sheet (226) which is clamped between the scissors fixing piece (222) and the yarn clamping plate (223) and is used for keeping the scissors moving piece (224) and the yarn clamping plate (223) in a clamping state.

8. The thread trimmer head of claim 2, wherein: the scissors assembly (22) further comprises a partition plate (227) arranged between the two wire adjusting mechanisms (2) and used for avoiding mutual interference of all components.

9. The thread trimmer head of claim 2, wherein: the yarn adjusting head further comprises yarn guide holes (7) which are arranged above the base (1) and the number of the yarn guide holes corresponds to that of the yarn adjusting mechanisms (2) and are used for facilitating yarn guide.

10. The thread trimmer head of claim 1, wherein: more than two sliding grooves (215) extending along the front-back direction are formed in the yarn nozzle plate (21), and a fixing rod (13) capable of penetrating through the sliding grooves (215) and in sliding fit with the sliding grooves is arranged on the base (1).

Technical Field

The invention relates to the field of textile machinery equipment, in particular to a yarn changing head.

Background

Yarn changing head in the field of textile machinery means a device capable of changing a yarn (a) for a knitting needle (B) of a knitting machine, so that the changed yarn (a) is hooked by the knitting needle (B) for knitting, and capable of clamping and cutting the yarn (a) at the end of knitting of a certain yarn (a), thereby preparing for the next yarn changing operation. The existing yarn adjusting head mostly adopts the structure as shown in figure 1, the existing yarn adjusting mechanism (C) of the yarn adjusting head takes a starting air cylinder (C1) as a driving device, takes a return tension spring (C2) as a return device, when knitting of a certain yarn (A) is finished, a piston rod in a starting cylinder (C1) overcomes the pulling force of a reset tension spring (C2) under the action of high-pressure (the gas pressure for a common knitting machine is 0.6-0.7 mpa) gas, one end of a scissors assembly (called scissors (C3) in the field) is pushed downwards, the other end of the scissors (C3) is enabled to be opened upwards around a hinge shaft (C5) to prepare clamping and cutting the yarn (A) which is reset by a yarn nozzle (C4) and fed into a scissors opening (C31), after the yarn nozzle (C4) is reset, the high-pressure gas is cut off, and at the moment, the scissors (C3) are closed under the action of the reset tension spring (C2), so that the yarn (A) is cut and clamped. The structure has the disadvantages that the closing action of the scissors (C3) is completely finished by the tension of the return tension spring (C2), so the return tension spring (C2) has certain strength, if the tension of the reset tension spring (C2) is insufficient, the scissors (C3) can not be driven to be completely closed, so that the yarn (A) can not be cut off, the knitting work can not be smoothly finished, if the tension of the tension spring is strengthened, the problem that the piston rod in the starting air cylinder (C1) can not overcome the tension of the reset tension spring (C2) and can not push the scissors (C3) to be opened completely occurs, because the piston rod in the air cylinder needs to overcome the tension of the reset tension spring (C2) when pushing the scissors (C1) to open, energy loss is caused, and the reset yarn nozzle (C4) can not send the yarn (A) into the scissors edge (C31) to carry out cutting action under the condition that the scissors (C1) are not completely opened. Therefore, under the condition that the pressure is 0.6-0.7 mpa commonly used in the textile field, the yarn reversing head cannot work stably.

Disclosure of Invention

The invention aims to: the yarn changing head is provided with a novel yarn changing mechanism, so that yarn can be stably changed for a knitting needle on a knitting machine, and the yarn can be clamped and cut off to prepare for subsequent yarn changing work when the yarn knitting is finished.

The invention is realized by the following technical scheme: a wire turning head is characterized in that: the thread adjusting mechanism comprises a base and more than one group of thread adjusting mechanisms arranged on the base, wherein each group of thread adjusting mechanisms comprises a yarn nozzle plate and a scissors assembly matched with the yarn nozzle plate, a yarn penetrating hole is formed in the front end of the yarn nozzle plate, the free end of yarn penetrates through the yarn penetrating hole and then is clamped and fixed on the scissors assembly, the yarn nozzle plate is connected to the base in a sliding mode and can slide back and forth relative to the base, a first slotted hole extending in the front-back direction is formed in the rear end of the yarn nozzle plate, a first pin shaft matched with the first slotted hole is arranged at the rear end of the scissors assembly, the first pin shaft at the rear end of the scissors assembly is matched and connected with the first slotted hole at the rear end of the yarn nozzle plate, and the front end of the scissors assembly is connected with the base;

the yarn adjusting head also comprises a first driving assembly which is connected between the base and the yarn nozzle plate and used for pushing the yarn nozzle plate to slide forwards relative to the base, and a first resetting assembly which is connected between the base and the yarn nozzle plate and used for driving the yarn nozzle plate to reset backwards; the first slotted hole in the yarn feeder plate can push a first pin shaft in the scissors assembly so as to drive the scissors assembly to move back and forth, the scissors assembly can be opened downwards relative to the yarn feeder plate through the first pin shaft under the action of the guide assembly when moving forwards, and the scissors assembly can drive the scissors assembly to be closed upwards relative to the yarn feeder plate to reset under the action of the guide assembly when moving backwards; the yarn adjusting head further comprises a driving device for driving the scissors assembly to loosen or cut yarns.

Preferably, the scissors assembly comprises a scissors fixing piece, a yarn clamping plate which is fixedly connected with the scissors fixing piece and is positioned between the scissors fixing piece and the yarn nozzle plate, and a scissors moving piece which is connected between the scissors fixing piece and the yarn clamping plate in a front-back sliding manner; the first pin shaft is fixedly arranged at the rear end of the scissors fixing piece, and the guide assembly comprises a first guide groove arranged at the front end of the scissors fixing piece and a first guide rod fixedly arranged on the base and used for being matched with the first guide groove;

the front end part of the yarn clamping plate is provided with a first arc-shaped groove with an opening at the upper part, and the front end part of the scissors fixing piece is provided with a second arc-shaped groove with an opening at the upper part at the position corresponding to the first arc-shaped groove; in an initial state, the free end of the yarn passes through the first arc-shaped groove and then is fixedly clamped between the two side walls of the yarn clamping plate matched with the scissors moving piece;

the rear end of the scissors moving part is provided with a first bump extending downwards, the driving device comprises a pushing part which is connected to the base in a sliding manner and is positioned below the scissors assembly, a second driving assembly which is connected between the pushing part and the base and is used for pushing the pushing part to slide, and a second resetting assembly which is connected between the pushing part and the base and is used for driving the pushing part to reset; the pushing piece can push the first lugs on all the scissors assemblies in an open state backwards for a certain distance and then the second resetting assembly drives the pushing piece to reset, so that the scissors moving piece can slide backwards relative to the scissors fixing piece to loosen yarns; in the resetting process that the scissor component is closed upwards relative to the yarn nozzle plate, the first arc-shaped groove and the second arc-shaped groove on the scissor component can hook back the yarn hooked by the knitting needle; the base is provided with a limiting surface used for limiting the limit position of the backward movement of the scissors moving piece; the yarn nozzle plate is provided with a second lug extending downwards; the scissors moving part stops moving backwards when a first bump on the scissors moving part touches a limit surface in the resetting process, and the pushing part can push a second bump on the yarn nozzle plate backwards for a certain distance and then drives the pushing part to reset by the second resetting component when the scissors moving part stops moving, so that the scissors fixing part slides backwards relative to the scissors moving part to clamp and cut off yarns.

Preferably, the first guide groove comprises a first groove, a second groove and a third groove which are in arc transition connection in sequence; the first groove is horizontally arranged along the front-back direction, the two-way groove is obliquely inclined upwards and backwards, and the three-way groove is obliquely inclined downwards and backwards; the scissors fixing piece and the yarn clamping plate are fixedly connected through more than two second pin shafts; and the scissors moving part is provided with second slotted holes which are matched with the second pin shafts in quantity and position and extend along the front-back direction.

Preferably, a push block is arranged on the yarn nozzle plate, a protruding piece which is located in front of the push block and extends upwards is arranged on the scissors fixing piece, and when the yarn nozzle plate moves forwards, the push block can push the protruding piece to drive the scissors assembly to move forwards, so that the first guide rod enters the groove II from the groove I.

Preferably, the pushing member comprises two connecting rods arranged on the left side and the right side of the base and extending along the front-back direction, and two connecting shafts vertically connected between the two connecting rods; the side walls of the left side and the right side of the base are provided with second guide grooves; the second guide groove comprises a first guide groove and a second guide groove which are in arc transition connection in sequence; the first guide groove and the second guide groove are inclined upwards and backwards, and the inclination of the second guide groove is smaller than that of the first guide groove; wherein both ends about the connecting axle that is located the place ahead cooperate respectively to be connected in two second guide ways, second drive assembly is for setting up on the base and being located the second cylinder between the connecting axle at rear, the second reset assembly is for connecting the second extension spring between the connecting axle at base and being located the rear.

Preferably, the first driving assembly is a first cylinder which is arranged above the yarn adjusting mechanism and connected between the base and the yarn nozzle plate and used for pushing the yarn nozzle plate to slide, and the first reset assembly is a first tension spring connected between the base and the yarn nozzle plate.

Preferably, the scissors assembly further comprises an elastic sheet clamped between the scissors fixing member and the yarn clamping plate and used for keeping the scissors moving member and the yarn clamping plate in a clamping state.

Preferably, the scissors assembly further comprises a partition plate arranged between the two wire adjusting mechanisms and used for avoiding the components from interfering with each other.

Preferably, the yarn adjusting head further comprises yarn guide holes which are arranged above the base and are used for facilitating yarn guide, and the number of the yarn guide holes corresponds to that of the yarn adjusting mechanisms.

Preferably, the yarn nozzle plate is provided with more than two sliding grooves extending along the front-back direction, and the base is provided with a fixing rod capable of penetrating through the sliding grooves and being in sliding fit with the sliding grooves.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention provides a yarn changing head, which enables a novel yarn changing mechanism to be used, yarns can be stably changed for knitting needles on a knitting machine through the matching movement of a yarn mouth plate and a scissors assembly, and the scissors assembly can clamp and cut the yarns when the yarns are knitted under the driving of a driving device to prepare for subsequent yarn changing work.

2. The yarn nozzle plate can move forward under the pushing of the first driving component, the scissors component can be driven by the first slotted hole through the first pin shaft, the scissors component can be opened downwards relative to the yarn nozzle plate along the guiding direction of the first guiding groove, so that a knitting needle on a knitting machine can hook yarns between the yarn nozzle plate and the scissors component, then the second driving component drives the pushing component to slide and pushes the scissors moving component to move backwards relative to the scissors fixing component to loosen the yarns, at the moment, the knitting needle can hook the yarns to knit, after the knitting of the yarns is finished, the first resetting component drives the whole yarn adjusting mechanism to reset, the scissors component can continue to hook back the yarns in the upward closing process, then the yarn adjusting mechanism continues to reset, and when the scissors moving component continues to reset, the first lug on the scissors moving component touches the limiting surface to stop moving, when the scissors moving part stops moving, the pushing part can push the second bump on the yarn nozzle plate backwards for a distance, so that the scissors fixing part slides backwards relative to the scissors moving part to clamp and cut off yarns.

3. The first guide groove comprises a first groove, a second groove and a third groove which are in arc transition connection in sequence; in the process of forward movement of the yarn nozzle plate, the first guide rod can sequentially pass through the first groove, the second groove and the third groove, so that the scissors assembly can be opened downwards relative to the yarn nozzle plate.

4. The yarn feeder plate is provided with the push block, the scissors fixing piece is provided with the protruding piece which is located in front of the push block and extends upwards, and when the yarn feeder plate moves forwards, the push block can push the protruding piece to drive the scissors assembly to move forwards, so that the first guide rod enters the groove II from the groove I.

5. The second cylinder can push the connecting shaft positioned in front to slide along the guide direction of the second guide groove, so that the pushing piece can push the scissor moving piece to loosen yarns, and push the scissor fixing piece to move backwards relative to the scissor moving piece to clamp and cut the yarns.

6. The scissors assembly further comprises an elastic sheet clamped between the scissors fixing piece and the yarn clamping plate, and the elastic sheet is used for keeping the scissors moving piece and the yarn clamping plate in a clamping state.

7. The scissors assembly further comprises a partition plate arranged between the two wire adjusting mechanisms, and mutual interference of all components can be avoided.

Drawings

FIG. 1 is a schematic three-dimensional structure diagram of a conventional wire adjusting head;

FIG. 2 is a schematic three-dimensional structure of the yarn turning head according to the present invention;

FIG. 3 is a schematic three-dimensional view of the base with the wire-turn head removed;

FIG. 4 is a schematic three-dimensional structure of the present invention with the wire adjusting head removed and a portion of the base removed;

FIG. 5 is a schematic three-dimensional structure of FIG. 4 from another perspective;

FIG. 6 is a schematic three-dimensional structure of a set of wire adjusting mechanisms in the wire adjusting head according to the present invention in an open state;

FIG. 7 is a schematic three-dimensional structure diagram of a set of wire adjusting mechanisms in the wire adjusting head of the present invention in a closed state;

FIG. 8 is a schematic structural view of a thread turning mechanism in the thread turning head according to the present invention;

FIG. 9 is an exploded view of FIG. 8;

fig. 10 is a schematic structural view of a part of the base in the wire-turning head according to the present invention.

Description of reference numerals: 1-base, 11-limiting surface, 12-second guide groove, 121-first guide groove, 122-second guide groove, 13-fixing rod, 2-line adjusting mechanism, 21-yarn nozzle plate, 211-yarn through hole, 212-first slotted hole, 213-second lug, 214-push block, 215-sliding groove, 22-scissors component, 221-first pin shaft, 222-scissors fixing component, 2221-second arc groove, 2222-lug, 223-yarn clamping plate, 2231-first arc groove, 224-scissors moving component, 2241-first lug, 2242-cutting edge, 2243-second slotted hole, 225-second pin shaft, 226-elastic sheet, 227-clapboard, 3-guide component, 31-first guide groove, 311-first guide groove, 312-second guide groove, 313-groove III, 32-first guide rod, 4-first driving component, 5-first resetting component, 6-driving device, 61-pushing piece, 611-connecting rod, 612-connecting shaft, 62-second driving component, 63-second resetting component, 7-yarn guide hole, A-yarn, B-knitting needle C-existing yarn adjusting mechanism, C1-starting cylinder, C2-resetting tension spring, C3-scissors, C31-scissors edge, C4-yarn nozzle and C5-hinged shaft.

Detailed Description

The invention is described in detail below with reference to the following description of the drawings:

as shown in fig. 2-10, the invention relates to a wire-changing head, which is characterized in that: the yarn adjusting device comprises a base 1 and more than one group of yarn adjusting mechanisms 2 arranged on the base 1, wherein each group of yarn adjusting mechanisms 2 comprises a yarn mouth plate 21 and a scissors assembly 22 matched with the yarn mouth plate 21, a yarn penetrating hole 211 is formed in the front end of the yarn mouth plate 21, the free end of a yarn A penetrates through the yarn penetrating hole 211 and then is clamped and fixed on the scissors assembly 22, the yarn mouth plate 21 is connected to the base 1 in a sliding mode and can slide back and forth relative to the base 1, a first groove hole 212 extending in the front-back direction is formed in the rear end of the yarn mouth plate 21, a first pin shaft 221 matched with the first groove hole 212 is arranged at the rear end of the scissors assembly 22, the first pin shaft 221 at the rear end of the scissors assembly 22 is matched and connected with the first groove hole 212 at the rear end of the yarn mouth plate 21, and the front end of the scissors assembly 22 is connected with the base 1;

the yarn adjusting head further comprises a first driving component 4 connected between the base 1 and the yarn nozzle plate 21 and used for pushing the yarn nozzle plate 21 to slide forwards relative to the base 1, and a first resetting component 5 connected between the base 1 and the yarn nozzle plate 21 and used for driving the yarn nozzle plate 21 to reset backwards; the first slotted hole 212 on the yarn mouth plate 21 can push the first pin shaft 221 on the scissors assembly 22 to drive the scissors assembly 22 to move back and forth, the scissors assembly 22 can be opened downwards relative to the yarn mouth plate 21 through the first pin shaft 221 under the action of the guide assembly 3 when moving forwards, and the scissors assembly 22 can be driven to be closed upwards and reset relative to the yarn mouth plate 21 under the action of the guide assembly 3 when moving backwards; the thread adjusting head also comprises a driving device 6 for driving the scissors assembly 22 to loosen or cut the yarn A.

As shown in fig. 2-10, the scissors assembly 22 includes a scissors fixing member 222, a yarn clamping plate 223 fixedly connected to the scissors fixing member 222 and located between the scissors fixing member 222 and the yarn feeder plate 21, and a scissors moving member 224 slidably connected back and forth between the scissors fixing member 222 and the yarn clamping plate 223; the first pin shaft 221 is fixedly arranged at the rear end of the scissors fixing member 222, and the guide assembly 3 comprises a first guide groove 31 arranged at the front end of the scissors fixing member 222 and a first guide rod 32 fixedly arranged on the base 1 and used for being matched with the first guide groove 31;

a first arc-shaped groove 2231 with an upper opening is arranged at the front end of the yarn clamping plate 223, and a second arc-shaped groove 2221 with an upper opening is arranged at the position, corresponding to the first arc-shaped groove 2231, at the front end of the scissors fixing piece 222; in the initial state, the free end of the yarn a passes through the first arc-shaped groove 2231 and then is fixedly clamped between the two side walls of the yarn clamping plate 223 and the scissors moving piece 224;

the rear end of the scissors moving member 224 is provided with a first bump 2241 extending downward, and the driving device 6 includes a pushing member 61 connected to the base 1 in a sliding manner and located below the scissors assembly 22, a second driving assembly 62 connected between the pushing member 61 and the base 1 for pushing the pushing member 61 to slide, and a second resetting assembly 63 connected between the pushing member 61 and the base 1 for driving the pushing member 61 to reset; the pushing member 61 can push all the first protrusions 2241 on the scissors assemblies 22 in the open state backwards for a certain distance, and then the second resetting assembly 63 drives the pushing member 61 to reset, so that the scissors moving member 224 can slide backwards relative to the scissors fixing member 222 to release the yarn a; during the resetting process of closing the scissors assembly 22 upwards relative to the yarn nozzle plate 21, the first arc-shaped groove 2231 and the second arc-shaped groove 2221 on the scissors assembly 22 can hook back the yarn a hooked by the knitting needle B; the base 1 is provided with a limiting surface 11 for limiting the backward movement limit position of the scissors moving piece 224; a second bump 213 extending downwards is arranged on the yarn nozzle plate 21; the cutting edge 2242 is arranged at the foremost part of the scissors moving piece 224, the scissors moving piece 224 stops moving backwards when the first bump 2241 on the scissors moving piece 224 touches the limiting surface 11 in the resetting process of the scissors moving piece 224, and the pushing piece 61 can push the second bump 213 on the yarn nozzle plate 21 backwards for a certain distance and then is driven by the second resetting component 63 to reset when the scissors moving piece 224 stops moving, so that the scissors fixing piece 222 slides backwards relative to the scissors moving piece 224 to clamp and cut off the yarn a.

As shown in fig. 4-9, preferably, the first guide slot 31 includes a slot one 311, a slot two 312, and a slot three 313, which are connected in an arc transition manner in sequence; the first groove 311 is horizontally arranged along the front-back direction, the second groove 312 is obliquely arranged upwards and backwards, and the third groove 313 is obliquely arranged downwards and backwards; the scissors fixing piece 222 and the yarn clamping plate 223 are fixedly connected through more than two second pin shafts 225; the scissors moving member 224 is provided with a second slot 2243 which matches with the second pin 225 in number and position and extends along the front-back direction.

As shown in fig. 4-9, preferably, the nozzle plate 21 is provided with a pushing block 214, the scissors fixing member 222 is provided with a protruding part 2222 located in front of the pushing block 241 and extending upward, and when the nozzle plate 21 moves forward, the pushing block 214 can push the protruding part 2222 to drive the scissors assembly 22 to move forward, so that the first guide rod 32 enters the slot two 312 from the slot one 311.

As shown in fig. 2 to 10, preferably, the pushing member 61 includes two connecting rods 611 disposed on the left and right sides of the base 1 and extending in the front-rear direction, and two connecting shafts 612 connected perpendicularly between the two connecting rods 611; the side walls of the left side and the right side of the base 1 are provided with second guide grooves 12; the second guide groove 12 comprises a first guide groove 121 and a second guide groove 122 which are connected in an arc transition manner in sequence; the first guide groove 121 and the second guide groove 122 are both inclined upwards and backwards, and the inclination of the second guide groove 122 is smaller than that of the first guide groove 121; wherein the left and right ends of the connecting shaft 612 located in front are respectively connected in the two second guide grooves 12 in a matching manner, the second driving component 62 is a second cylinder arranged on the base 1 and located between the connecting shafts 612 at the rear, and the second resetting component 63 is a second tension spring connected between the base 1 and the connecting shafts 612 at the rear.

As shown in fig. 4-7, preferably, the first driving component 4 is a first air cylinder disposed above the yarn adjusting mechanism 2 and connected between the base 1 and the yarn nozzle plate 21 for pushing the yarn nozzle plate 21 to slide, and the first returning component 5 is a first tension spring connected between the base 1 and the yarn nozzle plate 21.

As shown in fig. 2-9, the scissors assembly 22 further preferably includes a spring 226 interposed between the scissors fixing member 222 and the yarn clamping plate 223 for keeping the scissors moving member 224 and the yarn clamping plate 223 in a clamped state.

As shown in fig. 2-4, the scissors assembly 22 preferably further includes a partition 227 disposed between the two wire adjusting mechanisms 2 for avoiding interference between the components.

As shown in fig. 2-3, the yarn adjusting head preferably further comprises yarn guiding holes 7 corresponding to the number of the yarn adjusting mechanisms 2 and arranged above the base 1 for facilitating yarn guiding.

Preferably, the yarn nozzle plate 21 is provided with more than two sliding grooves 215 extending along the front-back direction, and the base 1 is provided with a fixing rod 13 capable of passing through and sliding-fitting with the sliding grooves 215.

The working principle of the embodiment is as follows: in the initial state, the yarn a passes through the yarn guide hole 7, the yarn threading hole 211 and the first arc-shaped groove 2231 in sequence and then is clamped between two side walls between the yarn clamping plate 223 and the scissors moving member 224, when the yarn needs to be exchanged, the piston rod of the first cylinder extends forward to push the yarn clamping plate 21 to move forward, the push block 214 on the yarn clamping plate 21 can push the protruding member 2222 on the scissors fixing member 222 and make the first guide rod 32 enter the groove two 312 from the groove one 311, i.e. the scissors assembly 22 opens a distance downwards relative to the yarn clamping plate 21, then the yarn clamping plate 21 is idle (i.e. the scissors assembly stops a section slowly), finally the first slot 212 on the yarn clamping plate 21 can push the first pin shaft 221 and make the first guide rod 32 enter the groove three 313 from the groove two 312, i.e. the scissors assembly 22 opens completely downwards relative to the yarn clamping plate 21, at this time, the knitting needle B on the knitting machine can hook the yarn a between the yarn clamping plate 21 and the scissors assembly 22, when a knitting needle B hooks a yarn A, a piston rod of a second cylinder extends out to push the pushing piece 61, so that a connecting shaft 612 positioned in front in the pushing piece 61 enters a guide groove II 122 from a guide groove I121, in the motion process of the connecting shaft 612, the connecting shaft 612 can push a first lug 2241 to move, so that a scissor moving piece 224 moves backwards relative to a scissor fixing piece 222 and loosens the yarn A, at the moment, the yarn A can be hooked by the knitting needle B to be knitted, after the knitting of the yarn A is finished, a yarn mouth plate 21 is reset by a first tension spring, meanwhile, the scissor assembly 22 is reset together, the scissor moving piece 224 stops moving when the first lug 2241 touches a limiting surface 11 in the reset process, at the moment, the piston rod of the second cylinder extends out again to push the pushing piece 61, so that the connecting shaft 612 positioned in front in the pushing piece 61 enters the guide groove II 122 from the guide groove I121, in the motion process of the scissor, link 612 pushes second tab 213 to move, causing scissors hinge 222 to move backward relative to scissors hinge 224, causing scissors hinge 224 and yarn clamp plate 223 to clamp yarn a therebetween and to cut yarn a near the end of needle B via cutting edge 2242 of scissors hinge 224.

While the invention has been illustrated and described with respect to specific embodiments and alternatives thereof, it will be understood that various changes and modifications can be made without departing from the spirit and scope of the invention. It is understood, therefore, that the invention is not to be in any way limited except by the appended claims and their equivalents.