Yarn tensioning device, method and roving frame with the device

Abstract

This invention discloses a yarn tensioning device, method, and roving frame having the device, comprising a support body, a rotating yarn feeding assembly, a rotatable component, and a spiral spring. The rotating yarn feeding assembly includes a shaft and at least one yarn feeding element. The rotating shaft is rotatably mounted on the tensioning support body, and the yarn feeding element is connected to one side of the rotating shaft and has a threading hole suitable for threading yarn. The rotatable component is connected to the rotating shaft, driving the rotating shaft to rotate the yarn feeding element by a predetermined angle. The spiral spring is connected to both the rotatable component and the support body, compressing to a predetermined compression level when the rotating component rotates by a predetermined angle. This yarn tensioning device, method, and roving frame have high operational reliability.

Description

Technical Field

[0001] This invention relates to the field of yarn tensioning equipment, and more particularly to yarn tensioning devices, methods, and roving frames having the same devices. Background Technology

[0002] Roving is a textile process that transforms multiple strands of yarn into rovings with different counts and twists. During the roving process, the yarn is fed from the roving frame to the crimping and plying unit for crimping and plying to form roving. As the roving process progresses, the yarn's tension fluctuates, sometimes loose and sometimes tight. Excessive tension can lead to breakage, while excessive looseness affects the quality of the resulting roving. Therefore, each strand of yarn needs to maintain a stable tension during roving to effectively improve the quality of the roving.

[0003] Currently, the tension adjustment device used in yarn roving includes a support base and an inclined fixed leaf spring with one end set on the support base and the other end being a free end. After the yarn emerges from the feeding device, it passes through a hole in the fixed leaf spring and is then pulled and tensioned to the crimping and twisting device. During this process, the tension of the yarn between the feeding device and the crimping and twisting device causes the free end of the fixed leaf spring to move downwards, resulting in elastic deformation. Therefore, during roving, if the yarn is slack, the fixed leaf spring tends to return to its original position to tighten the yarn; if the yarn is tightened, the elastic force of the fixed leaf spring itself offsets part of the tension, causing the yarn to slack. However, the deformation of the fixed leaf spring during the above adjustment process is due to the passive deformation caused by the yarn tensioning it. Since the degree of deformation of the fixed leaf spring is limited, the adjustment range of yarn tension during roving is limited, making it impossible to guarantee that the yarn tension remains stable throughout the roving process. This results in poor yarn tension adjustment capability and poor operational reliability.

[0004] In addition, since yarns of the same length but different linear densities have different qualities, for example, yarns of higher linear density have greater weight for the same length, and are more likely to loosen when the fixed leaf spring is tensioned, the existing leaf springs cannot guarantee that yarns of different linear densities can be fully tensioned during spinning, thus failing to guarantee the quality of the roving produced and having a narrow range of applications. Summary of the Invention

[0005] One advantage of the present invention is that it provides a yarn tensioning device, method and roving frame having the device, wherein the yarn tensioning device is capable of tensioning the yarn by actively storing force.

[0006] Another advantage of the present invention is that it provides a yarn tensioning device, method and roving frame having the device, wherein the yarn tensioning device allows the user to adjust the tension of the yarn according to the weight of the yarn, thereby enabling tensioning of yarns of different weights.

[0007] One advantage of the present invention is that it provides a yarn tensioning device, method and roving frame having the device, which has strong yarn tension adjustment capability and high operational reliability.

[0008] One advantage of the present invention is that it provides a yarn tensioning device, method and roving frame having the device, wherein a stationary tensioning member can limit the rotation range of the threading member, ensuring that the threading member is not over-tensioned, avoiding yarn tangling, and can cooperate with the threading member to change the direction of yarn tension.

[0009] One advantage of the present invention is that it provides a yarn tensioning device, method, and roving frame having the device, wherein the transmission component can stop transmission after the yarn feeder rotates counterclockwise to abut against the stationary tensioner, thereby avoiding wear on the stationary tensioner.

[0010] To achieve at least one of the advantages of the present invention, the present invention provides a yarn tensioning device, a support body; a rotating yarn threading assembly, the rotating yarn threading assembly including a rotating shaft and at least one yarn threading member, the rotating shaft being rotatably disposed on the support body, the yarn threading member being connected to one side of the rotating shaft and having a yarn threading hole suitable for threading yarn; a rotatable rotating component connected to the rotating shaft to drive the rotating shaft to rotate the yarn threading member by a predetermined angle; and a spiral-shaped spring connected to the rotating component and the support body respectively, to be compressed to a predetermined compression degree when the rotating component rotates by a predetermined angle.

[0011] According to one embodiment of the present invention, the yarn threading member includes a first yarn threading side, a second yarn threading side, and a connecting portion. The first yarn threading side is connected to the rotating shaft, and the yarn threading hole is formed on the first yarn threading side. The second yarn threading side is radially spaced from the first yarn threading side along the rotating shaft, and the yarn threading hole is formed on the second yarn threading side. The connecting portion connects the first yarn threading side and the second yarn threading side. The yarn tensioning device includes at least one stationary tensioning member, which is disposed on the support body and located on the rotation path of the yarn threading member, so as to prevent the yarn threading member from rotating after the connecting portion abuts against the stationary tensioning member.

[0012] According to one embodiment of the present invention, there are two stationary tensioning members, which are symmetrically arranged on opposite sides of the same circumference. The rotating shaft is disposed between the two stationary tensioning members. There are two threading members, which are symmetrically connected to opposite sides of the rotating shaft.

[0013] According to one embodiment of the present invention, the stationary tensioning member includes a shaft and an anti-wear sleeve. The shaft is fixedly disposed on the support body, and the anti-wear sleeve is sleeved on the outside of the shaft and has a smooth outer wall.

[0014] According to an embodiment of the present invention, the rotatable component includes: a rotatable member that can rotate counterclockwise; and a transmission member, the transmission member being connected to the rotatable member, the rotating shaft and the mainspring respectively, so as to transmit power to drive the rotating shaft to rotate counterclockwise and compress the mainspring as the rotatable member rotates counterclockwise, and after the connecting portion abuts against the stationary tensioning member, it no longer transmits power when the rotatable member rotates counterclockwise, so as to no longer drive the rotating shaft to rotate.

[0015] According to an embodiment of the present invention, the transmission member includes: an outer transmission cylinder disposed on the rotatable member and connected to the mainspring, so as to rotate and compress the mainspring as the rotatable member rotates counterclockwise; the inner wall of the outer transmission cylinder forms a plurality of outer transmission grooves disposed circumferentially thereon, and the depth of the outer transmission grooves gradually increases from top to bottom; an inner transmission disc disposed inside the outer transmission cylinder and connected to the rotating shaft, so as to drive the rotating shaft to rotate when the inner transmission disc rotates; the outer wall of the inner transmission disc is provided with an inner transmission groove extending from bottom to top in a counterclockwise direction; and at least one transmission ball disposed in the outer transmission groove and slidably disposed in the inner transmission groove.

[0016] According to one embodiment of the present invention, the inner transmission disk forms a non-circular rotating hole, and the rotating shaft has a non-circular rotating portion, which is sleeved in the rotating hole.

[0017] According to one embodiment of the present invention, the inner transmission disk has a plurality of transmission pawls extending radially, each of the transmission pawls having a free end, the outer wall of the free end of the plurality of transmission pawls being provided with the inner transmission groove, and the plurality of transmission balls being arranged one-to-one in the plurality of inner transmission grooves.

[0018] This invention provides a yarn tension adjustment method, which utilizes the yarn tensioning device described above to adjust the yarn tension. The yarn tension adjustment method includes: after the yarn passes through the threading hole, driving the rotatable component to rotate by a predetermined angle, thereby driving the rotating shaft to rotate by a predetermined angle and compressing the spring to a predetermined compression degree, thus tensioning the yarn; when the yarn tends to slack, driving the rotatable component to rotate in the opposite direction to prevent the yarn from slack; and when the yarn is tensioned, using the elasticity of the spring to offset part of the tension force, thereby preventing the yarn from becoming too tight.

[0019] The present invention provides a roving frame, comprising a yarn feeding device for supplying multiple strands of yarn; a crimping and plying device for crimping the multiple strands of yarn into ply roving; and a plurality of yarn tensioning devices as described above, wherein the plurality of yarn tensioning devices are disposed between the yarn feeding device and the crimping and plying device to tension the multiple strands of yarn supplied by the yarn feeding device one by one before supplying them to the crimping and plying device for processing. Attached Figure Description

[0020] Figure 1 A structural block diagram of a roving frame according to an embodiment of the present invention is shown.

[0021] Figure 2 A schematic diagram of the yarn tensioning device according to an embodiment of the present invention is shown.

[0022] Figure 3 An exploded view of a yarn tensioning device according to an embodiment of the present invention is shown.

[0023] Figure 4 A schematic diagram of the structure of an embodiment of the present invention is shown when the mainspring is not pre-tightened and the yarn threading component is not rotating.

[0024] Figure 5 A schematic diagram of the structure of the yarn threading component according to an embodiment of the present invention is shown when it is rotated counterclockwise by a predetermined angle.

[0025] Figure 6 A cross-sectional view of a stationary tensioning member according to an embodiment of the present invention is shown.

[0026] Figure 7 A schematic diagram of the structure of the outer transmission cylinder, inner transmission disc, and ball bearings according to an embodiment of the present invention is shown.

[0027] Figure 8 A schematic diagram of the structure of the yarn threading member in an embodiment of the present invention is shown when it rotates counterclockwise to abut against the stationary tensioning member.

[0028] Figure Labels

[0029] 100. Yarn tensioning device; 200. Yarn;

[0030] 10. Support body; 11. Support cover plate; 12. Support cylinder; 1201. Hollow channel;

[0031] 20. Rotating yarn threading assembly; 21. Rotating shaft; 211. Belt rotating part; High end part 2101; Low end part 2102; 22. Yarn threading component; 2201. Yarn threading hole; 221. First yarn threading side part; 222. Second yarn threading side part; 223. Connecting part;

[0032] 30. Rotatable component; 31. Rotatable part; 32. Outer transmission cylinder; 3201. Outer transmission slant groove; 33. Inner transmission disc; 3301. Inner transmission slide groove; 3302. With rotating hole; 331. Transmission pawl; 34. Transmission ball;

[0033] 40. Spring; 41. Outer end; 42. Inner end;

[0034] 50. Stationary tensioning component; 51. Shaft; 52. Anti-wear sleeve;

[0035] 300. Line supply device;

[0036] 400. Coiling and twisting device. Detailed Implementation

[0037] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0038] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0039] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] Combination Figures 1 to 4The yarn tensioning device 100 of the present invention is used to tension yarn. The yarn tensioning device 100 can be used on a roving frame and is disposed between a yarn supply device 300 and a crimping and twisting device 400 on the roving frame, so as to tension the yarn 200 provided by the yarn supply device 300 and then supply it to the crimping and twisting device 400 for processing.

[0042] Combination Figures 2 to 5 A yarn tensioning device 100 according to a preferred embodiment of the present invention will be described in detail below, wherein the yarn tensioning device 100 includes a support body 10, a rotating yarn threading assembly 20, a rotatable assembly 30 and a spiral spring 40.

[0043] Combination Figure 2 The rotating yarn-feeding assembly 20 includes a rotating shaft 21 and at least one yarn-feeding member 22. The rotating shaft 21 is rotatably disposed on the support body 10.

[0044] Specifically, the rotating shaft 21 has a high end portion 2101 and a low end portion 2102, the yarn threading member 22 is radially connected to the high end portion 2101 of the rotating shaft 21, and the yarn threading member 22 is formed with a yarn threading hole 2201 suitable for threading yarn.

[0045] The rotatable component 30 is connected to the lower end 2102 of the rotating shaft 21, so that the threading member 22 located at the upper end 2101 can rotate by a predetermined angle as the rotating shaft 21 is driven by the rotatable component 30, for example, by moving the threading member 22 from... Figure 4 Rotate to the state shown. Figure 5 The state shown is as follows. The two ends of the mainspring 40 are fixed to the rotatable component 30 and the support body 10 respectively, so that when the rotatable component 30 rotates at a predetermined angle, the mainspring 40 is compressed to a predetermined degree of compression.

[0046] Thus, when the yarn tensioning device 100 is used to adjust the yarn tension, the yarn tensioning adjustment method includes:

[0047] S10: Based on the thickness of the yarn 200 to be tensioned, drive the rotatable component 30 to rotate by a predetermined angle, so that the rotation of the rotatable component 30 by the predetermined angle drives the rotating shaft 21 to drive the yarn threading member 22 to rotate by a predetermined angle, and compresses the spring 40 to a predetermined degree of compression to pre-tension the spring 40; then, insert the yarn 200 of a predetermined thickness into the yarn threading hole 2201 and tension the yarn 200. For example, the yarn threading member 22 with a predetermined linear density is... Figure 4 Rotate counterclockwise to the state shown. Figure 5 The state shown, and then as Figure 5The yarn 200 is inserted into the state shown, and the yarn 200 is in the position shown. Figure 5 When the yarn is taut as shown, and for the yarn 200 with a higher linear density, the threading member 22 can rotate counterclockwise by a larger angle (or rotate several more times), thereby generating a larger elastic force within the spiral spring 40. Conversely, for the yarn 200 with a lower linear density, the threading member 22 can rotate counterclockwise by a smaller angle (or rotate fewer times), thereby generating a smaller elastic force within the spiral spring 40.

[0048] S20: When the yarn 200 tends to slack, for example, when the tension between the yarn supply device 300 and the crimping and twisting device 400 decreases, the elastic force provided by the spring 40 drives the rotatable component 30 to rotate a certain angle in the opposite direction, for example, clockwise, to prevent the yarn 200 from slack. When the yarn 200 tends to tighten, for example, when the tension between the yarn supply device 300 and the crimping and twisting device 400 increases and the yarn 200 is tightened, the elastic force provided by the spring 40 offsets part of the tension to prevent the yarn 200 from tightening. Furthermore, the elastic force provided by the spring 40 is greater for yarns 200 with higher linear density and smaller for yarns 200 with lower linear density.

[0049] Therefore, this invention can actively control the deformation degree of the mainspring 40 by actively controlling the rotation angle of the yarn feeder 22. Furthermore, the vortex-shaped mainspring 40 has a large deformation range, and can store a wide range of elastic potential energy and generate a large range of elastic force. Thus, it has a strong ability to adjust the tension of the yarn 200 during roving, ensuring that the tension of the yarn 200 remains stable even when the tension provided by the yarn supply device 300 and the crimping and twisting device 400 is too large or too small, resulting in high reliability. Moreover, it ensures that yarns 200 of different linear densities can be fully tensioned during roving, making it widely applicable.

[0050] In addition, it is understood that the yarn tensioning device 100 of the present invention is applicable to a range including but not limited to the roving frame, and can also be applied to other spinning devices that require the yarn 200 to maintain a stable tension.

[0051] Preferably, combined with Figure 2 and Figure 3The support body 10 includes a support cover plate 11 and a support cylinder 12. The support cylinder 12 has a hollow channel 1201. The support cylinder 12 is sleeved on the outside of the mainspring 40, and its inner wall is connected to the outer end 41 of the mainspring 40. The support cover plate 11 is fixed above the support cylinder 12. The rotating shaft 21 is rotatably disposed on the support cover plate 11. The high end 2101 of the rotating shaft 21 passes through the support body 11 and is connected to the yarn threading member 22. The low end 2102 of the rotating shaft 21 passes through the hollow channel 1201 and is connected to the rotatable component 30. The structure is compact and occupies little space.

[0052] Preferably, combined with Figure 2 The threading member 22 includes a first threading side 221, a second threading side 222, and a connecting portion 223. The first threading side 221 is connected to the rotating shaft 21, and a threading hole 2201 suitable for threading the yarn 200 is formed on the first threading side 221. The second threading side 222 is radially spaced from the first threading side 221 along the rotating shaft 21, and a threading hole 2201 suitable for threading the yarn 200 in a horizontal direction is formed on the second threading side 222. The connecting portion 223 connects the first threading side 221 and the second threading side 222. Both the first threading side 221 and the second threading side 222 are arranged to extend vertically to provide threading at a position above the top of the support 10.

[0053] Preferably, the yarn tensioning device 100 includes two yarn threading members 22 arranged symmetrically in mirror image along the rotating shaft 21. In this way, as the yarn threading members 22 rotate together with the rotating shaft 21, tension force can be applied to the yarn 200 threaded on the yarn threading members 22 at two points, thereby making it easier to tension the yarn 200.

[0054] The yarn tensioning device 100 includes at least one stationary tensioning member 50, which is disposed on the support body 10 and extends axially, and is located on the rotation path of the connecting portion 223 of the yarn threading member 22, so as to prevent the yarn threading member 22 from rotating after the connecting portion 223 abuts against the stationary tensioning member 50.

[0055] Preferably, when two yarn threading members 22 are provided, two stationary tensioning members 50 can be provided.

[0056] It is worth mentioning that when the stationary tensioning member 50 is located between the first threading side 221 and the second threading side 222, and is not collinear with either of the two threading holes 2201, for example... Figure 5In the state shown, the stationary tensioning member 50 changes the direction of the yarn 200 on the yarn threading member 22, further improving the tension effect of the yarn 200 when it is roving.

[0057] Furthermore, since the stationary tensioning member 50 is located on the rotation path of the connecting part 223 of the threading member 22, it can control the rotation range of the threading member 22 and effectively prevent the threading member 22 from rotating excessively and causing the yarn threaded on the threading member 22 to become tangled.

[0058] Specifically, in combination Figure 5 The yarn tensioning device 100 comprises two stationary tensioning members 50, symmetrically arranged on opposite sides of the same circumference. The rotating shaft 21 is positioned between the two stationary tensioning members 50. Two threading members 22 are symmetrically connected to opposite sides of the rotating shaft 21. In this way, the yarn tensioning device 100 can perform directional tensioning at multiple locations on the yarn 200, thereby ensuring that the yarn 200 is fully tensioned and guaranteeing the tensioning effect when the yarn 200 is roving.

[0059] Specifically, in combination Figure 6 The stationary tensioning member 50 includes a shaft 51 and an anti-wear sleeve 52. The shaft 51 is fixedly mounted on the support body 10. The anti-wear sleeve 52 is sleeved on the outside of the shaft 51, and its outer wall is smooth. In this way, the yarn 200 will not be worn when passing over the anti-wear sleeve 52, ensuring the quality of the yarn 200.

[0060] According to some preferred embodiments of the present invention, in combination with Figure 3 and Figure 7 The rotatable component 30 includes a rotatable part 31, an outer transmission cylinder 32, an inner transmission disc 33, and at least one transmission ball 34. The outer transmission cylinder 32 is fixedly disposed on the rotatable part 31, and its outer wall is connected to the inner end 42 of the mainspring 40 so as to rotate and compress the mainspring 40 as the rotatable part 31 rotates counterclockwise. The inner wall of the outer transmission cylinder 32 forms a plurality of outer transmission grooves 3201 arranged circumferentially thereon, and the depth of the outer transmission grooves 3201 gradually increases from top to bottom. The inner transmission disc 33 is disposed inside the outer transmission cylinder 32 and is connected to the rotating shaft 21 so as to drive the rotating shaft 21 to rotate when it rotates. The outer wall of the inner transmission disc 33 is provided with an inner transmission groove 3301 extending from bottom to top in a counterclockwise direction. The transmission ball 34 is disposed in the outer transmission groove 3201 or the inner transmission groove 3301 and can slide along the inner transmission groove 3301.

[0061] Therefore, as Figure 7When the rotatable component 31 rotates counterclockwise, the transmission ball 34 is located between the bottom end of the inner transmission groove 3301 and the bottom end of the outer transmission inclined groove 3201. The transmission ball 34 can transmit the counterclockwise rotation of the outer transmission cylinder 32 to the inner transmission disk 33, thereby driving the inner transmission disk 33 and the rotating shaft 21 connected to the inner transmission disk 33 to rotate counterclockwise, thereby driving the yarn threading component 22 to rotate counterclockwise, thus driving one side of the connecting part 223 of the yarn threading component 22 to gradually approach the stationary tensioning component 50. After that, when one side of the connecting part 223 of the yarn threading component 22 abuts against the stationary tensioning component 50, that is, as Figure 8 In the state shown, if the operator continues to rotate the rotatable component 31 counterclockwise, causing the outer transmission cylinder 32 to continue rotating counterclockwise, since the yarn threading component 22 is blocked by the stationary tensioning component 50, the counterclockwise rotation of the outer transmission cylinder 32 will cause the transmission ball 34 to move in the inner transmission groove 3301 in a bottom-to-top direction. This will cause the transmission ball 34 to move to a shallower part of the outer transmission groove 3201. Thus, the continued counterclockwise rotation of the outer transmission cylinder 32 will only cause the transmission ball 34 to roll in a slippery manner. The transmission ball 34 can no longer transmit the counterclockwise rotation of the outer transmission cylinder 32 to the inner transmission disc 33. Correspondingly, the yarn threading component 22 will no longer rotate counterclockwise, and will not cause too much extrusion damage, such as cracks, to the surface of the stationary tensioning component 50.

[0062] In this way, when the yarn has passed through the yarn threading member 22 and the required tension needs to be further increased, there is no need to remove the yarn 200. Instead, the rotatable member 31 can be rotated directly, and the yarn 200 will not be tangled after the rotatable member 31 is rotated.

[0063] Furthermore, since the spring 40 contains an elastic force that drives the outer transmission cylinder 32 to rotate clockwise, when the yarn 200 has a slack tendency, the spring 40 can drive the outer transmission cylinder 32 to rotate clockwise. This causes the transmission balls 34 to move from top to bottom within the inner transmission groove 3301, returning to the area between the bottom end of the inner transmission groove 3301 and the bottom end of the outer transmission inclined groove 3201. The clockwise motion is then transmitted through the transmission balls 34, thereby driving the inner transmission cylinder. The disc 33 and the yarn threading device 22 rotate clockwise, so that when the yarn 200 is stretched between the yarn supply device 300 and the crimping and twisting device 400, forming a taut tendency, the elasticity of the spring 40 can offset part of the tension. When the yarn 200 forms a slack tendency between the crimping and twisting device 400, the spring 40 can drive the yarn threading device 22 to rotate clockwise, thereby supporting the yarn 200 and keeping the yarn 200 in a stable tension state at all times.

[0064] Furthermore, combined Figure 2 The rotatable component 31 is disposed below the support cylinder 12 and extends a predetermined distance beyond the outer peripheral wall of the support cylinder 12, so that the user can rotate the rotatable component 31.

[0065] Furthermore, combined Figure 3 and Figure 7 The inner transmission disk 33 forms a non-circular rotating hole 3302, and the lower end 2102 of the rotating shaft 21 has a non-circular rotating part 211. The rotating part 211 is sleeved in the rotating hole 3302, thereby connecting the inner transmission disk 33 and the rotating shaft 21. When the inner transmission disk 33 rotates, it can drive the rotating shaft 21 to rotate.

[0066] Furthermore, combined Figure 7 The inner transmission disc 33 has multiple radially extending transmission pawls 331. Each inner transmission disc 33 has a free end at one end, and the outer wall of the free end of the multiple transmission pawls 331 is provided with an inner transmission groove 3301. Multiple transmission balls 34 are arranged one-to-one with each of the multiple inner transmission grooves 3301. This arrangement provides good transmission stability and reliability, and is lightweight and low-cost.

[0067] Specifically, there are three transmission balls 34 and three transmission pawls 331. The three transmission pawls 331 are evenly spaced along the circumference of the inner transmission disk 33, and one transmission ball 34 is provided in the inner transmission groove 3301 of each transmission pawl 331.

[0068] In the top view of the entire yarn tensioning device, the transmission pawl 331 is configured to rotate only clockwise relative to the outer transmission cylinder 32, and not counterclockwise.

[0069] With this configuration, when the spring 40 generates a spring force that drives the outer transmission cylinder 32 to rotate clockwise, the outer transmission cylinder 32 and the transmission pawl 331 can remain relatively fixed, thereby tensioning the yarn 200 when the yarn threading member 22 rotates.

[0070] Of particular note is that when the yarn 200 has different masses, the user can manually control the initial number of rotations of the rotatable component 31 based on the weight of the yarn 200, thereby controlling the amount of tension stored in the spring 40. In this way, the yarn tensioning device can provide different levels of tension for yarns 200 of different masses, effectively ensuring that the yarn 200 is tensioned.

[0071] This invention provides a roving frame, combined with Figure 1 The roving frame includes a yarn supply device 300, a crimping and twisting device 400, and multiple yarn tensioning devices 100 as described above. The multiple yarn tensioning devices 100 are disposed between the yarn supply device 300 and the crimping and twisting device 400 to tension the multiple strands of yarn 200 from the yarn supply device 30 one-to-one, and then supply them to the crimping and twisting device 400 for crimping and twisting to form roving.

[0072] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the invention. The advantages of the present invention have been fully and effectively realized. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments; any variations or modifications can be made to the implementation of the present invention without departing from these principles.

Claims

1. A yarn tensioning device, characterized in that, include: A supporting structure; A rotating yarn threading assembly includes a rotating shaft and at least one yarn threading member. The rotating shaft is rotatably disposed on the support body, and the yarn threading member is connected to one side of the rotating shaft and has a yarn threading hole suitable for threading yarn. The yarn threading member includes a first yarn threading side and a second yarn threading side for threading yarn, and a connecting part connecting the first yarn threading side and the second yarn threading side. A rotatable component connected to the rotating shaft, wherein the rotating shaft is driven to rotate by a predetermined angle, thereby causing the yarn threading member to rotate by a predetermined angle; and, A spiral-shaped spring is connected to the rotatable component and the support body respectively, so as to be compressed to a predetermined degree of compression when the rotatable component rotates a predetermined angle; At least one stationary tensioning member is disposed on the support body and located on the rotation path of the threading member, so as to prevent the threading member from rotating after the connecting part abuts against the stationary tensioning member; The rotatable component includes: a rotatable part that can rotate counterclockwise; and a transmission member, which is connected to the rotatable part, the rotating shaft, and the mainspring, respectively, to transmit power to drive the rotating shaft to rotate counterclockwise and compress the mainspring as the rotatable part rotates counterclockwise. After the connecting part abuts against the stationary tensioning member, it no longer transmits power when the rotatable part rotates counterclockwise, so as to no longer drive the rotating shaft to rotate. The transmission member includes: an outer transmission cylinder, which is disposed on the rotatable part and connected to the mainspring, so as to rotate counterclockwise with the rotatable part. The mainspring is compressed by rotation, and the inner wall of the outer transmission cylinder forms a plurality of external transmission grooves arranged circumferentially thereon, with the depth of the external transmission grooves gradually increasing from top to bottom; an inner transmission disc is disposed inside the outer transmission cylinder and connected to the rotating shaft to drive the rotating shaft to rotate when it rotates, and the outer wall of the inner transmission disc is provided with an inner transmission groove extending from bottom to top in a counterclockwise direction; and at least one transmission ball is disposed inside the external transmission groove and is slidably disposed in the inner transmission groove.

2. The yarn tensioning device according to claim 1, characterized in that, The first threading side is connected to the rotating shaft, and the threading hole is formed on the first threading side. The second threading side is radially spaced from the first threading side along the rotating shaft, and the threading hole is formed on the second threading side.

3. The yarn tensioning device according to claim 2, characterized in that, There are two stationary tensioning members, which are symmetrically arranged on opposite sides of the same circumference. The rotating shaft is located between the two stationary tensioning members. There are two threading members, which are symmetrically connected to opposite sides of the rotating shaft.

4. The yarn tensioning device according to claim 2 or 3, characterized in that, The stationary tensioning component includes a shaft and an anti-wear sleeve. The shaft is fixedly mounted on the support body, and the anti-wear sleeve is sleeved on the outside of the shaft with a smooth outer wall.

5. The yarn tensioning device according to claim 1, characterized in that, The inner transmission disc forms a non-circular rotating hole, and the rotating shaft has a non-circular rotating part, which is fitted inside the rotating hole.

6. The yarn tensioning device according to claim 1, characterized in that, The inner transmission disc has multiple transmission pawls extending radially, each transmission pawl having a free end, and the outer wall of the free end of the multiple transmission pawls is provided with the inner transmission groove. There are multiple transmission balls, and the multiple transmission balls are arranged one-to-one in the multiple inner transmission grooves.

7. The yarn tensioning device according to claim 1, characterized in that, The support body includes a support cover plate and a support cylinder. The support cylinder has a hollow channel and is sleeved on the outside of the mainspring, and its inner wall is connected to the outer end of the mainspring. The support cover plate is fixed above the support cylinder. The rotating shaft is rotatably disposed on the support cover plate. The high end of the rotating shaft passes through the support body and is connected to the yarn threading component. The low end of the rotating shaft passes through the hollow channel and is connected to the rotatable component.

8. A yarn tension adjustment method, characterized in that, The yarn tension is adjusted using the yarn tensioning device as described in any one of claims 1 to 7, wherein the yarn tension adjustment method includes: After the yarn passes through the threading hole, the rotatable component is driven to rotate by a predetermined angle, so that the rotating shaft is driven to rotate by the predetermined angle through the rotation of the rotatable component, and the threading component is rotated by a predetermined angle, and the spring is compressed to a predetermined compression degree, and the yarn is tensioned. When the yarn tends to slack, the rotatable component is driven by the spring to rotate in the opposite direction to prevent the yarn from slack. When the yarn is tightened, the elasticity of the spring counteracts part of the tension force to prevent the yarn from becoming taut.

9. A roving frame, characterized in that, include: A yarn supply device for supplying multi-strand yarn; A crimping and plying device for crimping multiple strands of the yarn into a ply roving; as well as, A plurality of yarn tensioning devices as described in any one of claims 1 to 7, wherein the plurality of yarn tensioning devices are disposed between the yarn supply device and the crimping and twisting device, so as to supply the crimping and twisting device for processing after tensioning the multiple strands of yarn provided by the yarn supply device one by one.

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