One-way yarn feeder

Abstract

The present application relates to the field of knitting machine yarn feeding device, and particularly relates to a one-way yarn feeder. The one-way yarn feeder comprises a shell, a first conveying roller and a second conveying roller rotatably arranged on the shell in parallel, the first conveying roller and the second conveying roller extending out of the shell in the same direction; a pair of transmission discs rotatably sleeved on the first conveying roller, an input shaft for inputting driving torque, a transmission assembly connected between the input shaft and the pair of transmission discs, the transmission assembly being used for transmitting the driving torque of the input shaft to the pair of transmission discs to rotate in opposite directions. A first transmission wheel slidably arranged on the first conveying roller and a second transmission wheel arranged on the second conveying roller, the first transmission wheel and the second transmission wheel being in transmission connection to drive the first conveying roller and the second conveying roller to rotate in the same direction, the first transmission wheel being arranged between the pair of transmission discs, and transmission teeth being oppositely arranged on the proximal ends of the first transmission wheel and the transmission discs. The one-way yarn feeder can automatically adapt to knitting machines with different steering directions.

Description

Technical Field

[0001] This invention relates to the field of yarn feeding devices for knitting machines, and more specifically to a unidirectional yarn feeder. Background Technology

[0002] Spandex yarn feeders are mainly used for conveying spandex yarns. Their working principle is illustrated in Chinese Utility Model Patent Publication No. CN206188994U, which describes a yarn feeder where the yarn bobbin is mounted on a feeding roller. A transmission wheel and transmission device drive a pair of feeding rollers to rotate, thereby rotating the yarn bobbin and conveying the yarn.

[0003] Different textile manufacturers adjust the rotation direction of circular knitting machines according to their process requirements. Existing spandex yarn feeders require pre-confirmation of the input shaft direction and pre-adjustment of the rotation to ensure the feed roller's rotation direction remains constant. Therefore, existing yarn feeders include a rotation adjustment component. Specifically, a pair of adjustable reversing gears are installed on the drive shaft connected to the input shaft. The drive gear on the input shaft meshes with different reversing gears to switch the drive shaft's rotation direction. Adjusting the rotation direction requires inserting a wrench into the yarn feeder to switch the reversing gears' engagement with the drive gear. Therefore, existing spandex yarn feeders require rotation adjustment before use to adapt to knitting machines with different rotation directions, leading to complex operation and affecting the yarn feeder's installation efficiency. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a unidirectional yarn feeder that can automatically adapt to knitting machines with different directions of rotation.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] A unidirectional yarn feeder, comprising:

[0007] The housing has a first and second conveyor rollers arranged in parallel on it, which extend out of the housing in the same direction to support the yarn bobbin.

[0008] A pair of drive discs are rotatably mounted on the first conveyor roller.

[0009] An input shaft is used to input the driving torque. A transmission assembly is provided between the input shaft and a pair of transmission discs to transmit the torque of the input shaft to the pair of transmission discs for counter-rotation.

[0010] A first drive wheel is slidably mounted on a first conveyor roller and a second drive wheel is mounted on a second conveyor roller. The first drive wheel and the second drive wheel are connected to drive the first conveyor roller and the second conveyor roller to rotate in the same direction. The first drive wheel is disposed between a pair of drive discs. Drive teeth are respectively provided on the proximal ends of the first drive wheel and the drive discs.

[0011] When the transmission disc rotates in the direction of rotation A, the relative transmission teeth between the transmission disc and the first transmission wheel mesh circumferentially to transmit the rotational torque;

[0012] When the transmission disc rotates in the opposite direction of rotation A, the relative transmission teeth between the transmission disc and the first transmission wheel transmit axial thrust to the first transmission wheel, so that the first transmission wheel moves to engage with the transmission disc on the opposite side circumferentially through the transmission teeth.

[0013] When the transmission teeth of the transmission disc on one side are circumferentially engaged with the first transmission wheel, the transmission teeth of the transmission disc on the other side are axially separated from the first transmission wheel.

[0014] Furthermore, in this application, a unidirectional yarn feeder includes a first transmission tooth disposed on the end face between a pair of transmission discs.

[0015] The first transmission tooth has a first transmission tooth surface on the side facing the rotation direction A, and the first transmission tooth surface is used to transmit rotational torque.

[0016] The first transmission tooth has a first helical tooth surface on the side opposite to the rotation direction A. The first helical tooth surface is used to convert the circumferential rotational thrust into axial thrust.

[0017] Furthermore, in a unidirectional yarn feeder of this application, the transmission teeth include second transmission teeth disposed on both end faces of the first transmission wheel;

[0018] The second transmission tooth has a second transmission tooth surface on the side opposite to the rotation direction A, and the second transmission tooth surface is used to transmit rotational torque.

[0019] The first transmission tooth has a second helical tooth surface on the side facing the rotation direction A. The second helical tooth surface is used to convert the circumferential rotational thrust into axial thrust.

[0020] Furthermore, in this application, a unidirectional yarn feeder includes a transmission assembly comprising a third transmission wheel rotatably mounted on a housing. The rotation axis of the third transmission wheel is perpendicular to the first conveying roller. A pair of transmission discs are symmetrically arranged on both sides of the third transmission wheel. The third transmission wheel is connected to the pair of transmission discs via bevel gear meshing. The third transmission wheel is also connected to an input shaft. As a preferred embodiment of this application, the third transmission wheel is driven by bevel gear meshing with the transmission discs on both sides, causing the pair of transmission discs to rotate in opposite directions.

[0021] Furthermore, in one unidirectional yarn feeder of this application, the input shaft is vertically rotatably mounted on the housing, the first conveying roller and the second conveying roller are horizontally arranged, and the input shaft is located on the side of the first conveying roller away from the second conveying roller.

[0022] Furthermore, in one of the unidirectional yarn feeders of this application, a unidirectional locking device is provided on the first conveying roller and / or the second conveying roller to prevent the first conveying roller and the second conveying roller from rotating in opposite directions in the working rotation direction. As a preferred embodiment of this application, the unidirectional locking device also functions to provide a reaction force when the relative transmission teeth between the transmission disc and the first transmission wheel transmit axial thrust to the first transmission wheel, preventing the first conveying roller and the second conveying roller from reversing in this process.

[0023] Furthermore, in a unidirectional yarn feeder of this application, a sliding sleeve is fitted onto the first conveying roller, the sliding sleeve is disposed between a pair of transmission discs, the first transmission wheel is slidably fitted onto the sliding sleeve, the sliding sleeve is connected to the first conveying roller by a locking member, and a circumferential locking structure is provided between the sliding sleeve and the first transmission wheel. As a preferred embodiment of this application, the sliding sleeve serves to axially isolate and limit the pair of discs. The connection between the sliding sleeve and the first conveying roller by the locking member reduces the structural complexity of the first conveying roller, and the circumferential locking structure between the sliding sleeve and the first transmission wheel is used to transmit rotational torque.

[0024] Furthermore, in a unidirectional yarn feeder of this application, the locking element is a glass ball screw, the front end of which is provided with an axially elastically movable top ball, the glass ball screw is radially inserted into the first conveying roller and the sliding sleeve, and the top ball extends out of the side of the sliding sleeve.

[0025] The first drive wheel has a pair of locking grooves on the sleeve sidewall that are adapted to the shape of the top ball, and the pair of locking grooves are spaced apart along the moving direction of the first drive wheel.

[0026] When the first drive wheel moves to the locking groove on one side where the top ball enters, the first drive wheel engages circumferentially with the drive disc on the same side through the transmission teeth. As a preferred embodiment of this application, the engagement of the top ball and the locking groove can axially limit the engagement of the first drive wheel and the drive disc circumferentially. When the drive disc transmits axial thrust to the first drive wheel, the top ball is pressed out of the locking groove, and the first drive wheel can move axially.

[0027] Furthermore, in a unidirectional yarn feeder of this application, the second transmission teeth are evenly arranged along the circumferential direction, and a tooth groove is provided between adjacent pairs of second transmission teeth to accommodate the transmission teeth on the transmission disc. As a preferred embodiment of this application, it is ensured that after the first transmission wheel is axially pushed into place, the transmission teeth on the transmission disc can directly enter the tooth groove and mesh with the second transmission teeth.

[0028] Furthermore, in one unidirectional yarn feeder of this application, an input pulley is provided on the input shaft. As a preferred embodiment of this application, the input shaft inputs rotational torque through the input pulley.

[0029] As can be seen from the above technical solution, the present invention has the following beneficial effects:

[0030] This invention provides a unidirectional yarn feeder. Its principle is as follows: the input shaft inputs torque, which drives a pair of transmission discs to rotate on a first conveying roller via a transmission assembly. The pair of transmission discs rotate in opposite directions. Therefore, regardless of the direction of the input shaft, one transmission disc always rotates in the direction of rotation A, while the other transmission disc rotates in the opposite direction. Thus, the transmission disc rotating in direction A engages circumferentially with the first transmission wheel through transmission teeth to transmit torque to the first transmission wheel and the first conveying roller, while the other transmission disc disengages from the first transmission wheel and cannot input torque. At this time, the first conveying roller only receives torque corresponding to the direction of rotation A. When the input torque changes, the transmission disc that originally rotated in direction A rotates in the opposite direction. The opposing transmission teeth between the transmission disc and the first transmission wheel transmit axial thrust to the first transmission wheel, causing the first transmission wheel to move and engage circumferentially with the opposite transmission disc through transmission teeth, while the opposite transmission disc is now rotating in direction A. Therefore, regardless of the rotation direction of the input shaft, the first transmission wheel is always subjected to the rotational torque of the corresponding rotation direction A. During this process, no manual adjustment is required, which realizes the function of the first and second conveying rollers always rotating in one direction, so as to automatically adapt to knitting machines with different directions. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a unidirectional yarn feeder in an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the internal structure of a unidirectional yarn feeder in an embodiment of this application;

[0033] Figure 3 for Figure 2 A magnified view of a portion of area A in the center circle;

[0034] Figure 4 This is a cross-sectional view of the component corresponding to the first conveying roller in the embodiments of this application;

[0035] Figure 5 This is an exploded view of the component corresponding to the first conveying roller in the embodiments of this application;

[0036] Figure 6 for Figure 5 A schematic diagram of the first transmission wheel and transmission disc.

[0037] In the diagram: 1 - shell;

[0038] 21-First conveyor roller; 211-Sliding sleeve; 212-Ball screw; 2121-Top ball; 22-Second conveyor roller; 221-One-way bearing;

[0039] 3-Transmission disc; 31-First transmission tooth; 311-First transmission tooth surface; 312-First helical tooth surface;

[0040] 40 - Second transmission tooth; 400 - Tooth groove; 401 - Second transmission tooth surface; 402 - Second helical tooth surface; 41 - First transmission wheel; 411 - Lock groove; 42 - Second transmission wheel;

[0041] 5 - Input shaft; 51 - Synchronous pulley; 52 - Input pulley;

[0042] 6-Third transmission wheel. Detailed Implementation

[0043] Combination Figures 1 to 6 A unidirectional yarn feeder shown includes:

[0044] The housing 1 has a first conveying roller 21 and a second conveying roller 22 arranged in parallel on the housing 1. The first conveying roller 21 and the second conveying roller 22 extend out of the housing 1 in the same direction to support the yarn bobbin. In this embodiment, the first conveying roller 21 and the second conveying roller 22 extend out of both sides of the housing 1.

[0045] A pair of drive discs 3 are rotatably mounted on the first conveyor roller 21;

[0046] Input shaft 5 is used to input driving torque. A transmission assembly is provided between input shaft 5 and a pair of transmission discs 3. The transmission assembly is used to transmit the driving torque of input shaft 5 to the pair of transmission discs 3 for phase-reverse rotation.

[0047] A first drive wheel 41 is slidably mounted on the first conveying roller 21 and a second drive wheel 42 is mounted on the second conveying roller 22. The first drive wheel 41 and the second drive wheel 42 are connected to drive the first conveying roller 21 and the second conveying roller 22 to rotate in the same direction. The first drive wheel 41 is disposed between a pair of drive discs 3. Drive teeth are respectively provided on the proximal ends of the first drive wheel 41 and the drive discs 3.

[0048] When the transmission disc 3 rotates in the direction of rotation A, the transmission teeth between the transmission disc 3 and the first transmission wheel 41 mesh circumferentially to transmit the rotational torque.

[0049] When the transmission disc 3 rotates in the opposite direction of rotation A, the relative transmission teeth between the transmission disc 3 and the first transmission wheel 41 transmit axial thrust to the first transmission wheel 41, so that the first transmission wheel 41 moves to engage with the transmission disc 3 on the opposite side circumferentially through the transmission teeth.

[0050] When the transmission teeth of the transmission disc 3 on one side are circumferentially engaged with the first transmission wheel 41, the transmission teeth of the transmission disc 3 on the other side are axially separated from the first transmission wheel 41.

[0051] Based on the above structure, the principle of a unidirectional yarn feeder is as follows: the input shaft 5 inputs rotational torque, which drives a pair of transmission discs 3 to rotate on the first conveying roller 21 via a transmission assembly. The pair of transmission discs 3 rotate in opposite directions. Therefore, regardless of the direction of the input shaft 5, one transmission disc 3 always rotates in the direction of rotation A, while the other transmission disc 3 rotates in the opposite direction of rotation A. Thus, the transmission disc 3 rotating in the direction of rotation A engages circumferentially with the first transmission wheel 41 through transmission teeth to transmit rotational torque to the first transmission wheel 41 and the first conveying roller 21, while the transmission disc 3 on the other side disengages from the first transmission wheel 41 and cannot input rotational torque. At this time, the first conveying roller 21 only receives rotational torque corresponding to the direction of rotation A. When the torque input to the input shaft 5 changes, the transmission disk 3, which was originally rotating in the direction of rotation A, rotates in the opposite direction. The transmission teeth between the transmission disk 3 and the first transmission wheel 41 transmit axial thrust to the first transmission wheel 41, causing the first transmission wheel 41 to move and engage circumferentially with the transmission disk 3 on the opposite side, while the transmission disk 3 on the opposite side is now rotating in the direction of rotation A. Therefore, regardless of the rotation direction of the input shaft 5, the first transmission wheel 41 is always subjected to the torque corresponding to the rotation direction A, without the need for manual adjustment, thus realizing the function of the first conveying roller 21 and the second conveying roller 22 always rotating in one direction. In this embodiment, a bearing is provided between the transmission disk 3 and the first conveying roller 21 to avoid direct transmission of torque between the transmission disk 3 and the first conveying roller 21. The first transmission wheel 41 and the second transmission wheel 42 are connected by a synchronous belt drive, and the side of the first transmission wheel 41 is provided with a groove.

[0052] In this embodiment, combined with Figures 2 to 6 As shown, the transmission gear includes a first transmission tooth 31 disposed on the end face between a pair of transmission discs 3; the first transmission tooth 31 has a first transmission tooth surface 311 on the side facing the rotation direction A, which is used to transmit rotational torque; the first transmission tooth 31 has a first helical tooth surface 312 on the side facing the opposite direction of rotation A, which is used to convert the circumferential rotational thrust into axial thrust. In this embodiment, the transmission disc 3 is provided with a plurality of first transmission teeth 31, which are arranged circumferentially at intervals, and specifically, each transmission disc 3 has 3 first transmission teeth 31.

[0053] In this embodiment, the transmission teeth include second transmission teeth 40 disposed on both end faces of the first transmission wheel 41;

[0054] The second transmission tooth 40 has a second transmission tooth surface 401 on the side opposite to the rotation direction A, and the second transmission tooth surface 401 is used to transmit rotational torque; the first transmission tooth 31 has a second helical tooth surface 402 on the side facing the rotation direction A, and the second helical tooth surface 402 is used to convert the circumferential rotational thrust into axial thrust. In this embodiment, the second transmission teeth 40 are evenly arranged along the circumferential direction, and a tooth groove 400 is provided between adjacent pairs of second transmission teeth 40, which is used to accommodate the transmission teeth on the transmission disk 3. This ensures that after the first transmission wheel 41 is axially pushed into place, the transmission teeth on the transmission disk 3 can directly enter the tooth groove 400 to mesh with the second transmission teeth 40. In this embodiment, the first transmission tooth 31 and the second transmission tooth 40 are axially opposite each other, and the first transmission tooth surface 311 and the first helical tooth surface 312 are circumferentially opposite to the second transmission tooth surface 401 and the second helical tooth surface 402, respectively.

[0055] In other embodiments, the second transmission tooth 40 is provided only on the first transmission wheel 41 or the first transmission tooth 31 is provided only on the transmission disk 3. The shape of the transmission tooth on the opposite side of the second transmission tooth 40 or the first transmission tooth 31 can be a common square tooth or a cylindrical tooth. Because when the transmission tooth on the opposite side abuts against the first helical tooth surface 312 or the second helical tooth surface 402, the transmission disk 3 can transmit axial thrust to the first transmission wheel 41 when it rotates.

[0056] Combination Figures 1 to 2 As shown, in this embodiment, the transmission assembly includes a third transmission wheel 6 rotatably mounted on the housing 1. The rotation axis of the third transmission wheel 6 is perpendicular to the first conveying roller 21. A pair of transmission discs 3 are symmetrically arranged on both sides of the third transmission wheel 6. The third transmission wheel 6 is connected to the pair of transmission discs 3 via bevel gear meshing. The third transmission wheel 6 is also connected to the input shaft 5. The third transmission wheel 6 is driven by the bevel gear meshing with the transmission discs 3 on both sides, causing the pair of transmission discs 3 to rotate in opposite directions. In this embodiment, the input shaft 5 and the third transmission wheel 6 are connected by a synchronous belt. The side of the corresponding third transmission wheel 6 is provided with a synchronous belt groove, and a synchronous pulley 51 is mounted on the input shaft 5. In other embodiments, the input shaft 5 and the third transmission wheel 6 can be connected by at least one of the following methods: gears, belt-pulley, and chain-sprocket.

[0057] In this embodiment, the input shaft 5 is vertically rotatably mounted on the housing 1, and the first conveying roller 21 and the second conveying roller 22 are horizontally arranged. The input shaft 5 is located on the side of the first conveying roller 21 away from the second conveying roller 22. In this embodiment, the input shaft 5 is located at the center of the first conveying roller 21 and the second conveying roller 22 in the extending direction, that is, the first conveying roller 21 and the second conveying roller 22 extend symmetrically on both sides of the input shaft 5 in the horizontal direction.

[0058] In this embodiment, the first conveying roller 21 and / or the second conveying roller 22 are provided with a one-way locking device to prevent the first conveying roller 21 and the second conveying roller 22 from rotating in opposite directions in the working rotation direction. The one-way locking device also functions to provide a reaction force when the opposing transmission teeth between the transmission disc 3 and the first transmission wheel 41 transmit axial thrust to the first transmission wheel 41, preventing the first conveying roller 21 and the second conveying roller 22 from reversing during this process. In this embodiment, the one-way locking device is a one-way bearing 221 mounted on the second conveying roller 22, with the outer ring of the one-way bearing 221 circumferentially locked to the housing 1.

[0059] Combination Figures 4 to 6 As shown, in this embodiment, a sliding sleeve 211 is fitted onto the first conveying roller 21, and the sliding sleeve 211 is disposed between a pair of transmission discs 3. The first transmission wheel 41 is slidably fitted onto the sliding sleeve 211. The sliding sleeve 211 is connected to the first conveying roller 21 by a locking member, and a circumferential locking structure is provided between the sliding sleeve 211 and the first transmission wheel 41. The sliding sleeve 211 serves to axially isolate and limit the pair of transmission discs 3. The connection between the sliding sleeve 211 and the first conveying roller 21 by the locking member reduces the structural complexity of the first conveying roller 21. Therefore, in this embodiment, the first conveying roller 21 is an optical axis. The circumferential locking structure between the sliding sleeve 211 and the first transmission wheel 41 is used to transmit rotational torque. In this embodiment, the sliding sleeve 211 is prism-shaped, and the first transmission wheel 41 has a corresponding sleeve hole to correspond to the circumferential locking structure.

[0060] In this embodiment, the locking component is a glass ball screw 212. The front end of the glass ball screw 212 is provided with an axially elastic top ball 2121. The glass ball screw 212 is radially inserted into the first conveying roller 21 and the sliding sleeve 211. The top ball 2121 extends out of the side of the sliding sleeve 211.

[0061] The sleeve sidewall of the first transmission wheel 41 is provided with a pair of locking grooves 411 that are adapted to the shape of the top bead 2121. The pair of locking grooves 411 are spaced apart along the moving direction of the first transmission wheel 41.

[0062] When the first drive wheel 41 moves to the point where the top ball 2121 enters the locking groove 411 on one side, the first drive wheel 41 engages circumferentially with the drive disc 3 on the same side through the transmission teeth. The engagement of the top ball 2121 and the locking groove 411 can axially limit the engagement of the first drive wheel 41 and the drive disc 3. When the drive disc 3 transmits axial thrust to the first drive wheel 41, the top ball 2121 is pressed out of the locking groove 411, and the first drive wheel 41 can move axially.

[0063] In this embodiment, the input shaft 5 is provided with an input pulley 52. ​​The input shaft 5 inputs rotational torque through the input pulley 52.

[0064] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can conceive of other specific embodiments of the invention without creative effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A unidirectional yarn feeder, characterized in that, include: The housing (1) has a first conveying roller (21) and a second conveying roller (22) arranged in parallel on the housing (1), and the first conveying roller (21) and the second conveying roller (22) extend out of the housing (1) in the same direction. A pair of drive discs (3), the pair of drive discs (3) are rotatably mounted on the first conveying roller (21), An input shaft (5) is provided, and a transmission assembly is provided between the input shaft (5) and a pair of transmission discs (3). The transmission assembly is used to transmit the rotational torque of the input shaft (5) to the pair of transmission discs (3) for reversible rotation. A first drive wheel (41) is slidably mounted on the first conveying roller (21) and a second drive wheel (42) is mounted on the second conveying roller (22). The first drive wheel (41) and the second drive wheel (42) are connected to drive the first conveying roller (21) and the second conveying roller (22) to rotate in the same direction. The first drive wheel (41) is disposed between a pair of drive discs (3). Drive teeth are respectively provided on the adjacent ends between the first drive wheel (41) and the drive discs (3). When the transmission disk (3) rotates in the rotation direction A, the relative transmission teeth between the transmission disk (3) and the first transmission wheel (41) mesh circumferentially to transmit the rotational torque. When the transmission disc (3) rotates in the opposite direction of rotation A, the relative transmission teeth between the transmission disc (3) and the first transmission wheel (41) transmit axial thrust to the first transmission wheel (41), so that the first transmission wheel (41) moves to engage with the transmission disc (3) on the opposite side circumferentially through the transmission teeth. When the transmission teeth of the transmission disc (3) on one side are engaged circumferentially with the first transmission wheel (41), the transmission teeth of the transmission disc (3) on the other side are axially separated from the first transmission wheel (41).

2. A unidirectional yarn feeder according to claim 1, characterized in that: The transmission teeth include a first transmission tooth (31) disposed on the end face between a pair of transmission discs (3). The first transmission tooth (31) has a first transmission tooth surface (311) on the side facing the rotation direction A, and the first transmission tooth surface (311) is used to transmit rotational torque; The first transmission tooth (31) is provided with a first helical tooth surface (312) on the side opposite to the rotation direction A. The first helical tooth surface (312) is used to convert the circumferential rotational thrust into axial thrust.

3. A unidirectional yarn feeder according to claim 1 or 2, characterized in that: The transmission teeth include second transmission teeth (40) disposed on both end faces of the first transmission wheel (41). The second transmission tooth (40) is provided with a second transmission tooth surface (401) on the side opposite to the rotation direction A. The second transmission tooth surface (401) is used to transmit rotational torque. The first transmission tooth (31) is provided with a second helical tooth surface (402) on the side facing the rotation direction A. The second helical tooth surface (402) is used to convert the circumferential rotational thrust into axial thrust.

4. A unidirectional yarn feeder according to claim 1, characterized in that: The transmission assembly includes a third transmission wheel (6) rotatably mounted on the housing (1). The rotation axis of the third transmission wheel (6) is perpendicular to the first conveying roller (21). A pair of transmission discs (3) are symmetrically arranged on both sides of the third transmission wheel (6). The third transmission wheel (6) is connected to the pair of transmission discs (3) through bevel gear meshing. The third transmission wheel (6) is connected to the input shaft (5).

5. A unidirectional yarn feeder according to claim 1, characterized in that: The input shaft (5) is vertically rotatably mounted on the housing (1), the first conveying roller (21) and the second conveying roller (22) are horizontally arranged, and the input shaft (5) is located on the side of the first conveying roller (21) away from the second conveying roller (22).

6. A unidirectional yarn feeder according to claim 1, characterized in that: The first conveying roller (21) and / or the second conveying roller (22) are provided with a one-way locking device to prevent the first conveying roller (21) and the second conveying roller (22) from rotating in the opposite direction of the working rotation direction.

7. A unidirectional yarn feeder according to claim 1, characterized in that: A sliding sleeve (211) is fitted on the first conveying roller (21). The sliding sleeve (211) is disposed between a pair of transmission discs (3). The first transmission wheel (41) is slidably fitted on the sliding sleeve (211). The sliding sleeve (211) is connected to the first conveying roller (21) by a locking member. A circumferential locking structure is provided between the sliding sleeve (211) and the first transmission wheel (41).

8. A unidirectional yarn feeder according to claim 7, characterized in that: The locking component is a glass ball screw (212), the front end of which is provided with an axially elastic top ball (2121), the glass ball screw (212) is radially inserted into the first conveying roller (21) and the sliding sleeve (211), and the top ball (2121) extends out of the side of the sliding sleeve (211); The first transmission wheel (41) has a pair of locking grooves (411) on the sleeve sidewall that are adapted to the shape of the top bead (2121). The pair of locking grooves (411) are spaced apart along the moving direction of the first transmission wheel (41). When the first transmission wheel (41) moves to the top ball (2121) entering the locking groove (411) on one side, the first transmission wheel (41) and the transmission disc (3) on the same side engage circumferentially through the transmission teeth.

9. A unidirectional yarn feeder according to claim 3, characterized in that: The second transmission teeth (40) are evenly arranged along the circumferential direction, and a tooth groove (400) is provided between an adjacent pair of second transmission teeth (40), the tooth groove (400) being used to accommodate the transmission teeth on the transmission disk (3).

10. A unidirectional yarn feeder according to claim 1, characterized in that: The input shaft (5) is provided with an input pulley (52).

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