阅读说明：本技术 一种恒力张紧机构及簇绒机 (Constant force straining device and tufting machine ) 是由 亓凯 张廷昕 张麦清 张凯 吴硕 张效清 于 2020-06-05 设计创作，主要内容包括：本发明涉及一种恒力张紧机构及簇绒机,涉及簇绒地毯加工的技术领域,其中恒力张紧机构包括空气泵、主管、支管、活塞与第一滑轮,主管与空气泵的出气口连通,支管设置有多个且均与主管连通,支管沿主管的长度方向上均布设置,活塞也设置有多个且活塞与支管一一对应,活塞的直径与支管的直径适配,活塞沿支管的长度方向与支管滑移连接,第一滑轮连接在活塞远离主管的一端,纤维丝缠绕在第一滑轮的外周面上且纤维丝与第一滑轮滚动连接；簇绒机包括架、上料机构、簇绒机构、下料机构与上述恒力拉紧机构。本发明在簇绒针和恒力张紧机构的作用下,将纤维丝在基布上均匀的拉扯出圈型绒,提升了簇绒地毯的美感,同时提高了簇绒地毯的耐久性。(The invention relates to a constant force tensioning mechanism and a tufting machine, and relates to the technical field of tufted carpet processing, wherein the constant force tensioning mechanism comprises an air pump, a main pipe, a plurality of branch pipes, pistons and a first pulley, the main pipe is communicated with an air outlet of the air pump, the branch pipes are provided with a plurality of pistons and are all communicated with the main pipe, the branch pipes are uniformly distributed along the length direction of the main pipe, the pistons are also provided with a plurality of pistons and are in one-to-one correspondence with the branch pipes, the diameters of the pistons are matched with the diameters of the branch pipes, the pistons are connected with the branch pipes in a sliding manner along the length direction of the branch pipes, the first pulley is connected to one end of the pistons, a fiber yarn is wound on; the tufting machine comprises a frame, a feeding mechanism, a tufting mechanism, a discharging mechanism and the constant force tensioning mechanism. Under the action of the tufting needle and the constant force tensioning mechanism, the invention uniformly pulls the fiber yarns out of the loop-shaped pile on the base cloth, thereby improving the aesthetic feeling of the tufted carpet and simultaneously improving the durability of the tufted carpet.)

1. The constant force tensioning mechanism is characterized by comprising an air pump (11), a main pipe (12), a branch pipe (13), a piston (14) and a first pulley (15), wherein the main pipe (12) is communicated with an air outlet of the air pump (11), the branch pipe (13) is provided with a plurality of pistons and communicated with the main pipe (12), the branch pipe (13) is uniformly distributed on the length direction of the main pipe (12), the pistons (14) are also provided with a plurality of pistons and the pistons (14) are in one-to-one correspondence with the branch pipe (13), the diameter of the pistons (14) is matched with the diameter of the branch pipe (13), the pistons (14) are arranged on the length direction of the branch pipe (13) and connected with the branch pipe (13) in a sliding manner, the first pulley (15) is connected with the pistons (14) far away from one end of the main pipe (12), and a fiber (7) is wound on the outer peripheral surface of the first pulley (15) and is wound with the first pulley (15) 15) And rolling connection.

2. The constant force tensioning mechanism of claim 1, wherein: a pressure release valve (19) is communicated between the main pipe (12) and the air pump (11).

3. The constant force tensioning mechanism of claim 1, wherein: constant force straining device (1) still includes uide bushing (16) and guide post (17), uide bushing (16) fixed connection be in branch pipe (13) are kept away from the one end of being responsible for (12), guide post (17) fixed connection be in the one end of being responsible for (12) is kept away from in piston (14), guide post (17) are worn to establish in uide bushing (16), guide post (17) with uide bushing (16) adaptation and cross-section are not circular, first pulley (15) rotate to be connected guide post (17) are kept away from the one end of piston (14).

4. The constant force tensioning mechanism of claim 3, wherein: the inner peripheral surface of one end, far away from the branch pipe (13), of the guide sleeve (16) is fixedly connected with a first limiting block (161), the outer peripheral surface of the guide column (17) is fixedly connected with a second limiting block (171), and the first limiting block (161) is abutted to the second limiting block (171).

5. The constant force tensioning mechanism of claim 4, wherein: the constant force tensioning mechanism (1) further comprises a first contact switch (18), the first contact switch (18) is fixedly connected to one end, close to the branch pipe (13), of the first limiting block (161), and the second limiting block (171) is abutted to the first contact switch (18).

6. The utility model provides a tufting machine, includes support (3), feed mechanism (4), tufting mechanism (5) and unloading mechanism (6), feed mechanism (4) include first base cloth roller (44) and second base cloth roller (45), first base cloth roller (44) with second base cloth roller (45) all rotate to be connected on support (3), feed mechanism (4) still include first roller (41), second roller (42) and third roller (43), first roller (41), second roller (42) all rotate with third roller (43) to be connected on support (3), tufting mechanism (5) are including stinging needle seat (51), felting needle (52), tufting needle seat (53) and tufting needle (54), stinging needle seat (51) with support (3) are slided and are connected, felting needle (52) fixed connection be in stinging needle seat (51), the tufting needle base (53) is fixedly connected to the support (3), the tufting needle (54) is rotatably connected to the tufting needle base (53), the blanking mechanism (6) comprises a first blanking roller (61), a licker-in (62) and a second blanking roller (63), and the first blanking roller (61), the licker-in (62) and the second blanking roller (63) are rotatably connected to the support (3) and the tufting needle base is characterized in that,

the constant force tensioning mechanism is characterized in that the support (3) is further provided with a constant force tensioning mechanism according to any one of claims 1 to 5, the air pump (11) is fixedly connected to the support (3), the main pipe (12) is also fixedly connected to the support (3), the fiber (7) is sequentially wound on the outer peripheral surfaces of the first roller (41), the second roller (42), the third roller (43) and the first pulley (15), and then the fiber (7) penetrates through the puncture needle (52).

7. The tufting machine of claim 6 and further comprising: the feeding mechanism (4) further comprises a second pulley (46) and a third pulley (47), the second pulley (46) and the third pulley (47) are connected to the support (3) in a rotating mode, the second pulley (46) is arranged between the first pulley (15) and the third roller (43), the third pulley (47) is arranged between the first pulley (15) and the pricking pin (52), the second pulley (46) and the third pulley (47) are arranged on one side, close to the main pipe (12), of the first pulley (15), the fiber yarn (7) is wound on the outer peripheral surfaces of the first pulley (15), the second pulley (46) and the third pulley (47) in sequence after the third roller (43), and then the fiber yarn (7) penetrates through the pricking pin (52).

8. The tufting machine of claim 6 and further comprising: feed mechanism (4) still include locking Assembly (2), locking Assembly (2) include sleeve (21), electro-magnet (22), compression spring (23) and pressure piece (24), sleeve (21) fixed connection be in on the outer peripheral face of uide bushing (16), electro-magnet (22) fixed connection be in sleeve (21) is kept away from the one end of uide bushing (16), pressure piece (24) pass uide bushing (16) with guide post (17) butt, the one end of compression spring (23) with electro-magnet (22) butt, the other end of compression spring (23) with pressure piece (24) butt.

9. The tufting machine of claim 8 and further comprising: still fixedly connected with second contact switch (25) and third contact switch (26) on support (3), second contact switch (25) set up the top of thorn needle file (51), third contact switch (26) set up the below of thorn needle file (51), thorn needle file (51) with second contact switch (25) or third contact switch (26) butt, second contact switch (25) with third contact switch (26) all with electro-magnet (22) electricity is connected.

Technical Field

The invention relates to the technical field of non-woven carpet processing, in particular to a constant-force tensioning mechanism and a tufting machine.

Background

Tufted carpets are a large variety of current industrial carpets, compared to non-woven carpets, which use needles on a backing fabric to penetrate fibrous materials such as polypropylene, nylon, or polyester, and hook these fibrous materials with tufting needles, and retract the tufting needles as the needles are retracted, causing the fibrous materials to form a loop-type pile on one side of the backing fabric. Due to the existence of the loop-type velvet, the thickness of the carpet is increased, the foot feeling is improved, and more importantly, the elasticity and the durability are improved.

At present, the Chinese patent application with publication number CN107385716A, published 24.11.2017, provides a multicolor same-tufting device of an artificial turf carpet and a tufting process thereof, wherein the multicolor same-tufting device of the artificial turf carpet comprises a rack and a knitting mechanism fixedly arranged on the rack, first thread-removing plates are symmetrically arranged on two sides of the top of the upper end of the rack, a plurality of groups of thread-removing through holes which are parallel to each other are arranged on the first thread-removing plates side by side, and drafting roller sets are fixedly arranged on two sides of the rack at the lower parts of the first thread-removing plates; the upper ends of the first thread-thinning plates symmetrically arranged on two sides of the rack are provided with a plurality of groups of thread-thinning through holes in parallel, and the other side of the knitting mechanism is provided with a winding roller group. The rolling roller group transmits a finished product obtained after tufting and knitting a plurality of layers or a layer of base cloth through the knitting mechanism to the other side of the rack for rolling through rolling and rolling traction. The knitting mechanism comprises a needle row positioned at the upper end and a knitting table positioned at the lower end of the needle row, a cutter row is arranged on the knitting table, and a buffer rubber pad is also arranged at the position, opposite to the needle row, on the knitting table; the needle row and the cutting knife row jointly form a core structure of the knitting mechanism.

When the tufted carpet is produced, the cellosilk is firstly stretched through the drafting roller group, then the cellosilk is separated through the thread thinning through hole, the cellosilk is prevented from being mutually wound, the cellosilk passing through the thread thinning through hole passes through the felting needle, then the needle row continuously moves up and down, and the tufting processing can be completed by the continuous swing of the cutting knife row.

The above prior art solutions have the following drawbacks: the tension of the fiber yarns is provided by the drafting roller group, and a plurality of fiber yarns are wound on one drafting roller group, so that the drafting roller group cannot provide constant tension for the plurality of fiber yarns, and the ring-shaped velvet has different excrement and urine when the tufted carpet is produced, thereby reducing the aesthetic feeling of the tufted carpet; the tufted carpet is easy to have the phenomena of thread hooking, thread opening and the like when in use, and the durability of the tufted carpet is reduced.

Disclosure of Invention

In view of the shortcomings of the prior art, a first object of the present invention is to provide a constant force tensioning mechanism, which can tension the filaments with a constant force, so that the tension force applied to each of the filaments in parallel is the same.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides a constant force straining device, includes the air pump, is responsible for, branch pipe, piston and first pulley, be responsible for with the gas outlet intercommunication of air pump, the branch pipe be provided with a plurality ofly and all with be responsible for the intercommunication, the branch pipe is followed the equipartition sets up on the length direction of being responsible for, the piston also be provided with a plurality ofly just the piston with the branch pipe one-to-one, the diameter of piston with the diameter adaptation of branch pipe, the piston is followed the length direction of branch pipe with the branch pipe slides and connects, first pulley is connected the piston is kept away from the one end of being responsible for, the cellosilk winding is in on the outer peripheral face of first pulley just the cellosilk with first pulley rolling connection.

By adopting the technical scheme, the air pump introduces high-pressure air into the main pipe, the pistons are ejected out of the branch pipes under the action of the high-pressure air, the air pressure in each branch pipe is the same, so that the thrust force borne by each piston is the same, the thrust force borne by the pistons is not changed by the change of the self sliding distance, the fiber yarns are wound on the peripheral surface of the first pulley, and each fiber yarn can be completely tensioned by the pushing of the pistons; when the internal tension of the fiber yarn changes, the piston can automatically slide in the branch pipe under the action force transmitted to the stress frame by the fiber yarn, so that the fiber yarn is prevented from being broken due to overlarge internal tension, the fiber yarn is protected, the production continuity is improved, and the production efficiency is further improved.

The present invention in a preferred example may be further configured to: and a pressure release valve is communicated between the main pipe and the air pump.

Through adopting above-mentioned technical scheme, operating personnel can be through the atmospheric pressure in the aperture control main pipe of adjustment relief valve, and then control the thrust of every piston for the tensile force of cellosilk is controllable.

The present invention in a preferred example may be further configured to: the constant force tensioning mechanism further comprises a guide sleeve and a guide post, the guide sleeve is fixedly connected with the branch pipe away from one end of the main pipe, the guide post is fixedly connected with one end of the piston away from the main pipe, the guide post is arranged in the guide sleeve in a penetrating mode, the guide post is matched with the guide sleeve, the cross section of the guide post is not circular, and the first pulley is rotatably connected with one end of the piston away from the guide post.

Through adopting above-mentioned technical scheme, when the piston slided from the branch pipe, the piston was difficult for following the axle center rotation of self in the branch pipe, and the piston can only promote first pulley and slide, and two adjacent cellosilks are difficult for intertwine, and then make the thrust of piston all turn into the tension of cellosilk, and all cellosilks are all by even tensioning, both can avoid the cellosilk to be torn, can avoid the cellosilk to be slack and undisciplined simultaneously.

The present invention in a preferred example may be further configured to: the inner peripheral surface of the guide sleeve, which is far away from one end of the branch pipe, is fixedly connected with a first limiting block, the outer peripheral surface of the guide post is fixedly connected with a second limiting block, and the first limiting block is abutted to the second limiting block.

Through adopting above-mentioned technical scheme, when the cellosilk is too loose, the piston slides towards the one end of keeping away from the person in charge, and first stopper and second stopper butt avoid the piston to deviate from the branch pipe this moment, and then avoided other branch pipes to release pressure, have improved the stability of the whole operation of constant force straining device.

The present invention in a preferred example may be further configured to: the constant force tensioning mechanism further comprises a first contact switch, the first contact switch is fixedly connected to one end, close to the branch pipe, of the first limiting block, and the second limiting block is abutted to the first contact switch.

Through adopting above-mentioned technical scheme, when the cellosilk is too loose, the piston drives first stopper and slides towards the second stopper, and back on first contact switch butt is on first contact switch, first contact switch circular telegram is reported to the police, and suggestion operating personnel cellosilk has been too loose, operating personnel alright this moment in order to adjust the degree of progress of corresponding cellosilk, a guarantee production quality.

A second objective of the present invention is to provide a tufting machine, which can produce tufted carpets when each fiber is tensioned, so that the loop-type pile on the tufted carpets has the same size, which can improve the aesthetic feeling of the tufted carpets, and at the same time, can reduce the probability of thread hooking and thread opening, and improve the durability of the tufted carpets.

The above object of the present invention is achieved by the following technical solutions:

a tufting machine comprises a support, a feeding mechanism, a tufting mechanism and a discharging mechanism, wherein the feeding mechanism comprises a first base cloth roller and a second base cloth roller, the first base cloth roller and the second base cloth roller are rotationally connected to the support, the feeding mechanism further comprises a first roller, a second roller and a third roller, the first roller, the second roller and the third roller are rotationally connected to the support, the tufting mechanism comprises a needle base, a needle, a tufting needle base and a tufting needle, the needle base is connected with the support in a sliding mode, the needle is fixedly connected to the needle base, the tufting needle base is fixedly connected to the support, the tufting needle is rotationally connected to the tufting needle base, the discharging mechanism comprises a first discharging roller, a licker-in roller and a second discharging roller, the first discharging roller, the needle roller and the second discharging roller are rotationally connected to the support, still be provided with on the support as in the first purpose constant force straining device, air pump fixed connection be in on the support, be responsible for also fixed connection be in on the support, the cellosilk twines in proper order on the outer peripheral face of first roller, second roller, third roller and first pulley, later the cellosilk passes the felting needle.

By adopting the technical scheme, the fiber yarns are firstly stretched preliminarily when passing through the first roller, the second roller and the third roller, the fiber yarns are already tensioned preliminarily, but the tensioning force of the fiber yarns is different, then the fiber yarns are tensioned by the constant force tensioning mechanism, so that the tensioning force of the fiber yarns is the same, then the fiber yarns penetrate into the felting needles, the base cloth enters the tufting machine through the first base cloth roller and the second base cloth roller, then the base cloth moves to a position between the felting needles and the tufting needles, the felting needle seats slide towards the base cloth to drive the fiber yarns to pass through the base cloth, then the tufting needles rotate to hook the fiber yarns passing through the base cloth, then the felting needle seats reset, at the moment, under the action of the tufting needles and the constant force tensioning mechanism, the fiber yarns are uniformly pulled out of loop type velvet on the base cloth, the aesthetic feeling of the tufted carpet is improved, and the probability of uneven thread hooking and thread opening caused by abrasion of the loop type velvet is reduced at the same time, the durability of the tufted carpet is improved, and then the tufted carpet is discharged out of the tufting machine through the first discharging roller, the licker-in roller and the second discharging roller in sequence.

The present invention in a preferred example may be further configured to: feed mechanism still includes second pulley and third pulley, the second pulley with the third pulley is all rotated and is connected on the support, the second pulley sets up first pulley with between the third roller, the third pulley sets up first pulley with between the felting needle, the second pulley with the third pulley all sets up first pulley is close to the one side of being responsible for, the cellosilk twines in proper order after the third roller and twines on the outer peripheral face of first pulley, second pulley and third pulley, and later the cellosilk passes the felting needle.

Through adopting above-mentioned technical scheme, under the direction of second pulley and third pulley, the cellosilk is difficult for droing from first pulley when the first pulley of process, homogeneity and reliability when having improved the cellosilk material loading.

The present invention in a preferred example may be further configured to: the feeding mechanism further comprises a locking assembly, the locking assembly comprises a sleeve, an electromagnet, a compression spring and a pressure block, the sleeve is fixedly connected to the outer peripheral surface of the guide sleeve, the electromagnet is fixedly connected to the sleeve and is far away from one end of the guide sleeve, the pressure block penetrates through the guide sleeve and the guide column in butt joint, one end of the compression spring is in butt joint with the electromagnet, and the other end of the compression spring is in butt joint with the pressure block.

By adopting the technical scheme, after the felting needle drives the fiber yarn to penetrate through the base cloth, the tufting needle hooks the fiber yarn, the felting needle resets and prepares to puncture the base cloth again, the tufting needle also resets at the moment and prepares to hook the next circle of fiber yarn, when the tufting needle resets, the electromagnet is powered off, the pressure block is pressed on the outer peripheral surface of the guide rod, the piston is positioned at the current extending position, the fiber yarn keeps the existing tension, the piston is prevented from applying the tension to the fiber yarn again, the processed loop-shaped velvet is prevented from rebounding under the action of the constant force tensioning mechanism, and the uniformity of the loop-shaped velvet is improved.

The present invention in a preferred example may be further configured to: the support is fixedly connected with a second contact switch and a third contact switch, the second contact switch is arranged above the puncture needle base, the third contact switch is arranged below the puncture needle base, the puncture needle base is abutted against the second contact switch or the third contact switch, and the second contact switch and the third contact switch are electrically connected with the electromagnet.

Through adopting above-mentioned technical scheme, when the felting needle seat moves down, the felting needle pierces through the base cloth, and when the felting needle seat moves down to lower spacing, the felting needle seat is contradicted with third contact switch, the electro-magnet loses the electricity this moment, the pressure piece compresses tightly the guide post in the guide sleeve, make the cellosilk keep current tension, the tufting needle catches on the cellosilk, later the felting needle seat rebound, the tufting needle loosens the cellosilk, the cellosilk is withdrawed under the effect of self residual tension and is formed the loop type fine hair, when the last spacing of felting needle seat rebound, the felting needle seat contradicts with second contact switch, later the electro-magnet is electrified, the pressure piece does not support with the guide post, first pulley continues to provide constant tension for the cellosilk, and carry out the tufting of next row of.

In summary, the invention includes at least one of the following beneficial technical effects:

1. through the arrangement of the constant force tensioning mechanism, constant tensioning force can be applied to all the fiber yarns, so that all the fiber yarns are tufted under the action of uniform tensioning, the uniformity of the loop-shaped velvet is ensured, the aesthetic feeling of the tufted carpet is improved, meanwhile, the probability of thread hooking and thread opening caused by uneven wear of the loop-shaped velvet is reduced, and the durability of the tufted carpet is improved; and the fiber yarn can be prevented from being pulled apart due to overlarge internal tension, the fiber yarn is protected, the production continuity is improved, and the production efficiency is further improved.

2. Through the setting of first stopper and second stopper, when the cellosilk is too loose, first stopper and second stopper butt avoid the piston to deviate from the branch pipe, and then avoided other branch pipes to release pressure, have improved the stability of the whole operation of constant force straining device, have improved the continuity of tufting machine production simultaneously.

3. Through the setting of locking Assembly, after using the tufting needle to accomplish the tufting to the cellosilk, locking Assembly locking guide bar makes the cellosilk keep current tension to avoid the piston to exert tension to the cellosilk again, so avoided the loop type fine hair of processing to kick-back under the effect of constant force straining device, improved the homogeneity of loop type fine hair.

Drawings

FIG. 1 is a schematic sectional view of the entire structure of the present embodiment;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

fig. 3 is a schematic cross-sectional view at a constant force tensioning mechanism.

Reference numerals: 1. a constant force tensioning mechanism; 11. an air pump; 12. a main pipe; 13. a branch pipe; 14. a piston; 15. a first pulley; 16. a guide sleeve; 161. a first stopper; 17. a guide post; 171. a second limiting block; 18. a first contact switch; 19. a pressure relief valve; 2. a locking assembly; 21. a sleeve; 22. an electromagnet; 23. a compression spring; 24. a pressure block; 25. a second contact switch; 26. a third contact switch; 3. a support; 31. a feed inlet; 32. a discharge port; 4. a feeding mechanism; 41. a first roller; 42. a second roller; 43. a third roller; 44. a first base cloth roll; 45. a second base cloth roll; 46. a second pulley; 47. a third pulley; 48. a thread thinning plate; 481. a line-dredging hole; 5. a tufting mechanism; 51. a barbed needle seat; 52. a needle; 53. tufting needle seat; 54. a tufting needle; 6. a blanking mechanism; 61. a first blanking roller; 62. a licker-in; 63. a second feed roller; 7. and (4) fiber yarns.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, the embodiment provides a tufting machine, which includes a support 3, a tufting mechanism 5 for tufting is disposed on the support 3, the tufting mechanism 5 includes a needle seat 51, and a plurality of needles 52 are uniformly clamped on the needle seat 51 along the length direction thereof. The lancet holder 51 is driven by a driving device (not shown in the figures) to make the lancet holder 51 slide up and down with the support 3 along the length direction of the lancet 52.

The tufting mechanism 5 further comprises a tufting needle holder 53 and tufting needles 54, the tufting needle holder 53 being arranged directly below the needle holder 51, one tufting needle 54 corresponding to one needle 52. The tufting needle seat 53 is fixedly connected with the bracket 3 through bolts, the tufting needle 54 is rotatably connected with the upper end surface of the tufting needle seat 53, and the tufting needle 54 is driven by a driving device (not shown in the figure). Alternatively, the tufting needle holder 53 is rotatably connected to the support 3, the tufting needle 54 is fixedly connected to the upper end face of the tufting needle holder 53, and the tufting needle holder 53 is driven by a driving device (not shown).

Referring to fig. 1, a feeding mechanism 4 is provided on a support 3, and the feeding mechanism 4 includes a first roller 41, a second roller 42, and a third roller 43 that feed a fiber filament 7 to a needle 52. The first roller 41, the second roller 42 and the third roller 43 are all arranged at the top of the bracket 3 and are all rotationally connected with the bracket 3. The first roller 41, the second roller 42, and the third roller 43 are parallel to each other, and the fiber 7 penetrates the holder 3 from above the holder 3 and is wound around the outer peripheral surfaces of the first roller 41, the second roller 42, and the third roller 43 in an S-shape in this order.

Referring to fig. 1 and 2, the thread-thinning plate 48 is fixedly connected to the bracket 3 through bolts, the length direction of the thread-thinning plate 48 is the same as the length direction of the lancet seat 51, and a plurality of thread-thinning holes 481 are uniformly formed in the thread-thinning plate 48 along the length direction thereof, and one thread-thinning hole 481 corresponds to one lancet 52. After being wound around the third roller 43, the filament 7 is inserted into the needle hole of the lancet 52 through the thread-spreading hole 481.

Referring to fig. 1 and 3, the bracket 3 is further provided with a constant force tensioning mechanism 1 for tensioning the fiber filaments 7, and the constant force tensioning mechanism 1 comprises an air pump 11, a main pipe 12, a branch pipe 13 and a piston 14. The air pump 11 is fixedly connected to the bracket 3 through bolts, the main pipe 12 is communicated with an exhaust pipe of the air pump 11 through a pressure relief valve 19, and the length direction of the main pipe 12 is the same as that of the needle seat 51.

The branch tubes 13 are provided in plural numbers, and plural ones of the branch tubes 13 are parallel to each other, and one branch tube 13 corresponds to one lancet 52. One end of the branch pipe 13 is communicated with the main pipe 12, the piston 14 is arranged in the branch pipe 13 in a penetrating mode, and the piston 14 is connected with the branch pipe 13 in a sliding mode along the length direction of the branch pipe 13. One end of the piston 14 far away from the main pipe 12 is fixedly connected with a guide post 17 through a screw, one end of the guide post 17 far away from the piston 14 is rotatably connected with a first pulley 15, the axis of the first pulley 15 is parallel to the axis of the third roller 43, and the first pulley 15 is arranged between the third roller 43 and the thread thinning plate 48.

The feeding mechanism 4 further comprises a second pulley 46 and a third pulley 47, the axes of the second pulley 46 and the third pulley 47 are parallel to the axis of the first pulley 15, the second pulley 46 is arranged between the first pulley 15 and the third roller 43, and the third pulley 47 is arranged between the first pulley 15 and the thread thinning plate 48. The second pattern and the third pulley 47 are both arranged on the side of the first pulley 15 close to the piston 14, and the fiber 7 is wound around the third roller 43, then sequentially wound around the second pulley 46, the first pulley 15 and the third pulley 47, and then passed through the thread thinning hole 481 of the thread thinning plate 48 (as shown in fig. 2).

The constant force tensioning mechanism 1 further comprises a guide sleeve 16, the guide sleeve 16 is welded at one end of the branch pipe 13 far away from the main pipe 12, and the center of the guide sleeve 16 is coaxial with the axis of the branch pipe 13. The guide sleeve 16 is sleeved on the outer peripheral surface of the guide column 17, and the guide column 17 slides relative to the guide sleeve 16 along the length direction of the guide column 17. The guide post 17 has a cross section identical to the inner cross section of the guide sleeve 16 and is not circular to avoid rotation of the guide post 17 along its own center during sliding.

A first limit block 161 is integrally formed on the inner peripheral surface of one end of the guide sleeve 16 away from the branch pipe 13, a first contact switch 18 is fixedly connected to one end of the first limit block 161 close to the main pipe 12 through a screw, and a second limit block 171 is integrally formed on the outer peripheral surface of the guide column 17. When the internal tension of the fiber 7 is too small, the piston 14 and the guide column 17 both slide towards the end far away from the main pipe 12, the first limiting block 161 is abutted against the second limiting block 171, the second limiting block 171 triggers the first contact switch 18, and the first contact switch 18 is electrified to alarm.

Referring to fig. 1, the feeding mechanism 4 further includes a first base cloth roller 44 and a second base cloth roller 45 for transporting the base cloth to the tufting machine, the first base cloth roller 44 and the second base cloth roller 45 are rotatably connected to one side of the lower portion of the support frame 3, the first base cloth roller 44 and the second base cloth roller 45 are parallel to each other, and the first base cloth roller 44 is also parallel to the first roller 41. The outer peripheral surfaces of the first base cloth roller 44 and the second base cloth roller 45 are abutted against each other, a feed opening 31 is formed in one side of the support 3 close to the first base cloth roller 44, the base cloth enters the tufting machine from the feed opening 31, passes through the space between the first base cloth roller 44 and the second base cloth roller 45, and then is conveyed to the needle 52.

Referring to fig. 2 and 3, after the needle 52 drives the filament 7 through the base fabric, the tufting needle 54 hooks the filament 7, then the needle 52 retracts, and after the needle 52 is reset, the tufting needle 54 is also reset, and the filament 7 slightly rebounds under the action of its own internal tension and finally forms a loop-shaped pile. In order to prevent the tension provided by the constant-force tensioning mechanism 1 to the filaments 7 from pulling the loop pile back during tufting, a locking assembly 2 is also provided on the guide sleeve 16, which locks the guide posts 17.

The locking assembly 2 comprises a sleeve 21, which sleeve 21 is fixedly attached to the outer circumferential surface of the guide sleeve 16 by means of screws. An electromagnet 22 is fixedly connected to the interior of one end of the sleeve 21 far away from the guide sleeve 16 through a screw, and a pressure block 24 is connected to the interior of the sleeve 21 in a sliding manner along the direction perpendicular to the length direction of the guide sleeve 16. The pressure block 24 and the electromagnet 22 are connected by a compression spring 23, one end of the compression spring 23 abuts against the electromagnet 22, and the other end of the compression spring 23 abuts against the pressure block 24. One end of the pressure block 24 far away from the electromagnet 22 passes through the guide sleeve 16 and abuts against the outer peripheral surface of the guide post 17.

After the tufting needle 54 is reset, the electromagnet 22 is powered off, the pressure block 24 clamps the guide post 17 in the guide sleeve 16, so that the constant force tensioning mechanism 1 can not provide tension for the fiber yarn 7 any more, and the fiber yarn 7 can rebound under the internal tension of the fiber yarn 7 to form loop-shaped velvet. When the lancet 52 is next extended, the electromagnet 22 is de-energized and the pressure block 24 is no longer in abutment with the guide post 17, so that the constant force tensioning mechanism 1 again provides constant tension to the filament 7.

In order to ensure that the pressure block 24 can press the guide post 17 when the piston 14 is at any position of the branch pipe 13, the length of the pressure block 24 in the length direction of the guide post 17 is set to be the same as the length of the guide sleeve 16.

Referring to fig. 1 and 2, the bracket 3 is further fixedly connected with a second contact switch 25 and a third contact switch 26 through screws, the second contact switch 25 is arranged above the lancet holder 51, and the third contact switch 26 is arranged below the lancet holder 51. When the needle seat 51 slides upwards to the upper limit, the needle seat 51 is abutted with the second contact switch 25, and when the needle seat 51 slides downwards to the lower limit, the needle seat 51 is abutted with the third contact switch 26. The second contact switch 25 and the third contact switch 26 are both electrically connected with the electromagnet 22, when the puncture needle seat 51 is abutted against the second contact switch 25, the electromagnet 22 is powered, and when the puncture needle seat 51 is abutted against the third contact switch, the electromagnet 22 is powered off.

Referring to fig. 1, the support 3 is further provided with a discharging mechanism 6 for discharging the woven carpet out of the tufting machine, the discharging mechanism 6 includes a first discharging roller 61, a licker-in roller 62 and a second discharging roller 63, and the woven carpet is sequentially wound on the outer circumferential surfaces of the first discharging roller 61, the licker-in roller 62 and the second discharging roller 63 in an S-shape. The surface of the carpet having loop pile contacts the outer peripheral surfaces of the first and second blanking rollers 61 and 63, and the surface of the carpet having no loop pile contacts the outer peripheral surface of the licker-in 62. A discharge port 32 is formed in one side, close to the second discharging roller 63, of the support 3, and the processed carpet bypasses the second discharging roller 63 and then passes out of the tufting machine from the discharge port 32.

Referring to fig. 1 and 2, since the fiber yarn 7 requires different tensions in order to process loop-shaped piles of different sizes, two sets of the first roller 41, the second roller 42, the third roller 43, the second pulley 46, the constant force tensioning mechanism 1, the third pulley 47, and the thread straightening plate 48 are provided and symmetrically provided on both sides of the needle bed 51 in the longitudinal direction. When the tensioning force of the fiber yarns 7 is adjusted, the air pressure in the two main pipes 12 can be adjusted by adjusting the opening degree of the pressure release valves 19, and then the tensioning force of the fiber yarns 7 is adjusted, and if the opening degrees of the two pressure release valves 19 are different, the loop-shaped velvet with different sizes and uniform distribution can be formed on the base cloth.

The implementation principle of the embodiment is as follows:

after entering the tufting machine from the upper part of the bracket 3, the fiber yarn 7 is conveyed and primarily tensioned by a first roller 41, a second roller 42 and a third roller 43, part of the fiber yarn 7 reaches the required tensioning force, and then the fiber yarn 7 sequentially rounds a second pulley 46, a first pulley 15 and a third pulley 47 and then passes through a needle hole of a felting needle 52 after passing through a thread-thinning plate 48;

under the action of the constant force tensioning mechanism 1, the untensioned fiber yarns 7 are also tensioned; after entering the tufting machine from the feed inlet 31, the base cloth is conveyed to a position between the felting needles 52 and the tufting needles 54 through the first base cloth roller 44 and the second base cloth roller 45, then the felting needles 52 do up-and-down reciprocating motion continuously, and the tufting needles 54 do oscillating reciprocating motion continuously;

when the needle 52 is fully extended, the tufting needle 54 swings, the needle seat 51 is in contact with the third contact switch 26, the third contact switch 26 is powered on, the electromagnet 22 is powered off, the pressure block 24 presses the guide column 17 in the guide sleeve 16, the fiber yarn 7 keeps the existing tension, and the tufting needle 54 hooks the fiber yarn 7; then the puncture needle 52 is reset, after the puncture needle 52 is reset, the puncture needle seat 51 is contacted with the second contact switch 25, the second contact switch 25 is electrified, the tufting needle 54 is reset and is not hooked on the fiber yarn 7 any more, then the electromagnet 22 is electrified, the pressure block 24 is not abutted with the guide post 17 any more, the constant-force tensioning mechanism 1 continues to provide constant tension for the fiber yarn 7, and then the puncture needle 52 can puncture the base cloth again in such a cycle;

after the tufting process is completed on the base fabric, the base fabric passes through a first blanking roller 61, a licker-in 62 and a second blanking roller 63 in sequence and leaves the tufting machine from the discharge port 32.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.