Automatic yarn joint device and method thereof

Abstract

The present invention relates to an automatic yarn joint device (9) of a textile ring spinning machine (1) and a method of joining a broken yarn to a drafted fiber bundle. The yarn joint device (9) comprises a lifting unit for lifting a broken yarn from a thread package (8), a suction unit (10) adapted to accommodate the broken yarn lifted by the lifting unit, and a joint unit (11) configured to join a tail end (15) of the broken yarn to the fiber bundle drafted by a drafting unit (4). The joint unit (11) comprises a positioning device (12) adapted to perform a lap joint procedure to incorporate the tail end (15) of the broken yarn to the fiber bundle.

Description

Technical Field

[0001] This invention relates to textile spinning machines. More specifically, it relates to an automatic yarn splicing device for splicing broken yarn ends in ring spinning machines, compact yarn spinning machines, and the like. More specifically, the invention addresses the control and splicing of broken yarns in an automatic yarn splicing device for a textile ring spinning machine, and provides a method for splicing broken yarns in a ring spinning machine. Background Technology

[0002] The topics discussed in the Background section should not be considered prior art simply because they are mentioned therein. Similarly, problems mentioned in or related to the topics in the Background section should not be considered as having been previously recognized in the prior art. The topics in the Background section merely represent different approaches and may in themselves correspond to implementations of the claimed technology.

[0003] In textile spinning mills, ring spinning machines are used to produce yarn from fibers that are drafted and twisted, then wound onto a cylindrical shell called a "cop" or "bobbin." During this conventional spinning process, yarn breakage in ring spinning machines is a common and frequent problem, requiring constant attention from the workforce. Today, yarn breakage remains a major drawback of ring spinning machines, forcing a significant workforce to continuously monitor them along the length of the machine frame. To avoid wasting yarn, broken yarns must be manually spliced ​​on the spot after breakage, and the spinning sequence must subsequently be restarted.

[0004] With the advent of modern technology, automated splicing devices have been provided as an improvement over conventional manual splicing techniques for fibers. These automated splicing devices involve robots or workers within splicing vehicles or equipment, which have built-in drive and support units and are movable along the length of the ring spinning machine frame. At specific yarn breakage stations, these automated splicing devices are required to advance towards the ring spinning machine for splicing operations and return to their original positions after the splicing operation is completed.

[0005] Because various parameters such as splice count, machine speed, and humidity play a major role in combining yarn breaks with the conveying fibers during splicing operations, this known splicing arrangement actually fails to properly splice yarn breaks. Furthermore, the failure of a particular splicing cycle continues with further attempts to repeat the splicing yarn until a successful splicing operation is achieved. If many such yarn wastes exist throughout the machine length during the production period in a spinning mill, this results in a significant amount of yarn waste.

[0006] The present invention was conceived in view of the above circumstances, and the object of the present invention is to provide a novel and improved splicing arrangement for an automatic yarn splicing device for a ring spinning machine, a compact spinning machine, or the like.

[0007] Purpose of the invention

[0008] The purpose of this invention is to provide an automatic yarn splicing device and method that can effectively splice yarns to the fiber bundle in a ring spinning machine.

[0009] Another object of the present invention is to provide an automatic yarn splicing device and method that can reduce yarn waste.

[0010] Another object of the present invention is to provide a reliable and efficient automatic yarn splicing device and method, which is capable of performing improved and precise splicing of broken yarn ends. Summary of the Invention

[0011] To achieve the above objectives, according to one aspect of the present invention, an automatic yarn splicing device for a ring spinning machine is disclosed. The automatic yarn splicing device includes: a lifting unit for lifting a broken yarn from a spool of the ring spinning machine; a suction unit for receiving the broken yarn lifted by the lifting unit; and a splicing unit for connecting the tail end of the broken yarn to a fiber bundle drafted by a drafting unit of the ring spinning machine. The splicing unit includes a positioning device for performing an over-splitting process to merge the tail end of the broken yarn into the fiber bundle. The positioning device is provided with a yarn connecting device configured to move in both the horizontal and transverse directions with respect to the drafting unit to perform the over-splitting.

[0012] According to an embodiment of the invention, the suction unit includes a tubular nozzle for receiving the tail end of a broken yarn before the drafting rollers of the drafting unit. The tail end of the broken yarn can be received in the tubular nozzle by applying negative pressure through it.

[0013] According to an embodiment of the invention, the splicing unit includes a yarn-connecting device configured to move in a horizontal and transverse direction with respect to the drafting unit via a set of first and second actuators; and a set of stops for limiting excessive movement of the yarn-connecting device. The actuators are pneumatic, hydraulic, or screw-type.

[0014] According to an embodiment of the invention, the yarn splicing device is hinged at a fulcrum and includes a nose adapted to move the tail end of a broken yarn, received by a tubular nozzle, to a position suitable for a splicing process between the front roller and the intermediate roller.

[0015] According to an embodiment of the invention, the yarn splicing device moves together with the carried tail yarn on the left side of the front top roller, moves toward the top draft roller, and moves to the right to perform over-splitting at the left draft roller for yarn breakage. Furthermore, the yarn splicing device moves together with the carried tail yarn on the right side of the front top roller, moves toward the top draft roller, and moves to the left to perform over-splitting at the right draft roller for yarn breakage.

[0016] According to an embodiment of the invention, the splicing unit includes a cutter assembly mounted near the yarn splicing device. The cutter assembly performs a cutting operation on the excess length of the broken yarn. The cutter assembly includes a fixed blade member, a movable blade member, and a cutter assembly actuator. The movable blade member performs a scissor action about the fixed blade member around a pivot joint to cut off the excess length of the broken yarn.

[0017] According to an embodiment of the invention, the automatic yarn splicing device further includes a spindle brake actuation mechanism configured to apply a brake to the spindle station during a yarn breakage splicing operation.

[0018] Another aspect of the invention relates to an automatic yarn splicing method for a ring spinning machine, which effectively splices yarn to a transported fiber bundle in the ring spinning machine while reducing yarn waste and performing improved and precise splicing of broken yarn ends. The method involves lifting a broken yarn from a spool in the ring spinning machine, receiving the broken yarn lifted by a lifting unit, and connecting the tail end of the broken yarn to a fiber bundle drafted by a drafting unit of the ring spinning machine.

[0019] According to an embodiment of the present invention, the automatic yarn splicing method further includes performing a splicing process to merge the tail end of a broken yarn into a fiber bundle by moving the yarn splicing device about the drafting unit in the horizontal and transverse directions.

[0020] According to an embodiment of the present invention, the automatic yarn splicing method further involves the step of generating a negative pressure through a tubular nozzle of a suction unit so that the tubular nozzle can accommodate the tail end of a broken yarn before the drafting rollers of the drafting unit.

[0021] According to an embodiment of the invention, the yarn splicing device is moved in the horizontal and transverse directions with respect to the drafting unit by a set of first and second actuators, and excessive movement of the yarn splicing device is limited by a set of stops. The nose of the yarn splicing device moves the tail end of the broken yarn, which is received by the tubular nozzle, to a position suitable for the over-splicing process between the front roller and the intermediate roller.

[0022] According to an embodiment of the invention, the yarn splicing device moves together with the carried tail yarn on the left side of the front top roller, moves toward the top draft roller, and moves to the right to perform over-splitting at the left draft roller for yarn breakage. Furthermore, the yarn splicing device moves together with the carried tail yarn on the right side of the front top roller, moves toward the top draft roller, and moves to the left to perform over-splitting at the right draft roller for yarn breakage.

[0023] According to an embodiment of the present invention, the automatic yarn splicing method further includes the step of cutting off the excess length of the broken yarn after splicing.

[0024] Other aspects and advantages of the invention will become apparent from the following description, which illustrates the principles of the invention by way of example, in conjunction with the accompanying drawings. Attached Figure Description

[0025] Figure 1 A schematic diagram of a double-sided ring spinning frame is shown, with only one spinning station shown for illustrative purposes.

[0026] Figure 2 A schematic diagram of a spinning station and an automatic yarn splicing device in a ring spinning machine according to an embodiment of the present invention is shown.

[0027] Figure 3 A schematic diagram of an automatic splicing device during splicing sequence according to an embodiment of the present invention is shown, wherein the splicing arm assembly is in a retracted position and the tail end of the broken yarn is held in the suction unit.

[0028] Figure 4 A schematic diagram of an automatic yarn splicing device during splicing sequence according to an embodiment of the present invention is shown, wherein the splicing arm assembly is in an extended position, i.e., in front of the drafting unit.

[0029] Figure 5 and Figure 6 A schematic diagram of the connector arm assembly and positioning device of the automatic yarn splicing device according to an embodiment of the present invention is shown.

[0030] Figure 7 and Figure 8 A schematic diagram of the positioning device and cutter assembly of the automatic yarn splicing device according to an embodiment of the present invention is shown.

[0031] Figure 9 A schematic diagram of an automatic yarn splicing device after the splicing operation is completed, according to an embodiment of the present invention, is shown, wherein the splicing arm assembly is in the retracted position. Detailed Implementation

[0032] The detailed description set forth below with reference to the accompanying drawings is intended to describe various embodiments of the invention and is not intended to represent only the embodiments in which the invention can be practiced. The various embodiments described in this disclosure are provided merely as examples or illustrations of the invention and should not necessarily be construed as preferred or advantageous over other embodiments. The detailed description includes specific details in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without these specific details.

[0033] It should also be noted that the singular forms “a,” “an,” and “the” as used herein and in the appended claims include plural references unless the context clearly indicates otherwise. Although any systems and methods similar to or equivalent to those described herein may be used in the practice or testing of embodiments of this disclosure, preferred arrangements and methods are described here.

[0034] Exemplary embodiments will now be described more fully below with reference to the accompanying drawings, in which exemplary embodiments are illustrated. However, this disclosure may be implemented in many different forms and should not be construed as limiting oneself to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art. Furthermore, all statements and specific examples of embodiments of this disclosure referenced herein are intended to cover their structural and functional equivalents. Additionally, it is intended that such equivalents include both currently known equivalents and those developed in the future (i.e., any elements developed that perform the same function, regardless of their structure).

[0035] refer to Figure 1 The ring spinning machine 1 includes at least one spinning station 2, at which the roving or nonwoven yarn, i.e., fiber bond 3, supplied is conveyed downward to a drafting unit 4, which is equipped with multiple top drafting rollers and bottom drafting rollers 5a, 5b, 6a, 6b, 7a, and 7b. A counterweight arm presses three top rollers 5a, 6a, and 7a onto three bottom rollers 5b, 6b, and 7b, which rotate at different speeds. The rear rollers 7a and 7b rotate slowly, while the intermediate roller pair 6a and 6b rotates faster than the first pair. The front rollers 5a and 5b rotate at very high speeds. Due to these different speeds and the load on the top rollers, the roving 3 supplied to the drafting unit 4 is pulled out and its thickness is greatly reduced.

[0036] As the roving leaves the last pair of top and bottom rollers of drafting unit 4, it is twisted through a ring with rotating travelers and a rotating spindle located below the drafting unit 4 system. Twisting generates friction between the fibers, increasing the strength of the fiber bundle. In this state, the fiber bundle is now referred to as yarn. The yarn is wound onto a spool attached to the spindle. The yarn is conveyed through the gap between conveyor rollers 5a and 5b and then wound onto the spool attached to the spindle to form a yarn spool 8.

[0037] like Figure 2 As shown, when the yarn breaks, the automatic yarn splicing device 9 comes to the front of the spinning station 2. The automatic yarn splicing device 9 includes: a lifting unit for lifting the broken yarn from the spool 8; at least one insertion unit for inserting the yarn into a traveler; a top suction unit 10 for holding the lifted yarn; and a splicing unit 11 for connecting the broken yarn end to the fiber being drafted in the drafting unit 4. Suction is generated, and the yarn is lifted from the spool 8 and held in the tubular nozzle 16 provided in the suction unit 10. The yarn splicing unit 11 also includes a yarn positioning device 12 and a support frame 13 for supporting the yarn positioning device 12. In addition, a forward mechanism (not shown) is provided for moving the support frame toward and away from the drafting unit 4. During this stage, the broken yarn end 15' of the fiber bundle is continuously carried by the suction of the broken yarn collection tube 14 of the spinning station 2, while the tail yarn 15 follows the spool 8.

[0038] The present invention Figure 3 This illustrates how a broken portion of the yarn tail from the spool is held within a tubular nozzle. When the yarn breaks, as the automatic yarn splicing device 9 moves toward the spinning station 2, the spindle brake actuation mechanism (not shown) of the splicing device 9 brakes the running spindle of the rotating spool 8. A negative pressure, i.e., suction, is applied through the tubular nozzle 16, which is located in the top suction unit 10 of the splicing device 9. This generates a suction force, and the yarn tail 15 from the spool 8 is carried to the open end of the tubular nozzle 16. Therefore, during the splicing operation, the carried yarn tail 15 is held within the tubular nozzle 16 for a predetermined period of time. Simultaneously, the splicing arm assembly 17 is held in its home position.

[0039] According to an embodiment of the invention, the suction unit 10 of the automatic splicing device 9 may comprise a single or two Venturi nozzles, instead of a large suction motor, for picking up the yarn end from the spool 8. The Venturi nozzle may receive compressed air and blow it upstream of the spool 8. The Venturi nozzle may have multiple tapered inlets through which air is blown into the interior, thereby generating an upward suction force within the suction unit 10 to lift the broken yarn end from the spool. Thus, the compressed air exiting the Venturi nozzle at the outlet generates an upward suction force, thereby picking up the yarn end from the spool 8. In another embodiment, in addition to the Venturi nozzle, multiple air nozzles may be provided to assist in lifting the broken yarn end from the spool 8.

[0040] like Figure 4 As shown, the splice arm assembly 17 moves from its original position to its working position, i.e., towards the drafting unit 4, so that the tail yarn 15 held by the tubular nozzle 16 is also carried upwards to the drafting unit 4. The tail yarn 15 is guided to the front drafting roller pair 5a, 5b of the drafting unit 4. Now, the yarn positioning device 12 provided in the splice arm assembly 17 performs an over-piecing process to combine the tail yarn 15 with the drafted fiber bundle between the drafting roller pair 5a, 5b, 6a, 6b, and complete the splicing action. At the same time, the spindle brake is released to restore the yarn winding operation to the spool 8. According to the invention, the term "over-piecing" refers to the method of inserting a broken yarn into the drafting zone where the fiber is being drafted, thereby merging the end of the broken yarn with the drafted fiber itself. Thus, the end of the broken yarn and the drafted fiber are connected together. The yarn positioning device 12 is operated by a set of pneumatic / electric or screw actuators. As needed, the actuator facilitates the movement of the yarn positioning device in the xyz direction.

[0041] In the attached diagram Figure 5-7The figure shows an isometric view of the connector arm assembly 17 according to the invention. As shown, the connector arm assembly 17 includes a connector arm 18 with a yarn positioning device 12, wherein a yarn connecting device 19 is provided for manipulating yarn received from the tubular nozzle 16 of the top suction unit 10. The yarn connecting device 19 is operated horizontally and laterally using multiple pneumatic / electric or screw actuators. Horizontal movement of the yarn connecting device 19, as used herein, refers to movement parallel to the axis on which draft rollers 5a, 5b, 6a, 6b, 7a, 7b are mounted, wherein the axes of each pair of rollers are parallel to each other. The top rollers 5a, 5c, 6a, 6c, 7a, 7c of each pair of rollers may be mounted on the same axis or on different axes. Therefore, horizontal movement is movement from left to right or from right to left, while lateral movement, as used herein, refers to movement in the radial direction, i.e., towards or away from the rollers. The yarn connecting device 19 has a nose 20 at its front end for holding the tail yarn, and the other end of the yarn connecting device 19 is connected to a second actuator 22. The center of the yarn connecting device 19 is hinged at a fulcrum 23. A first actuator 21 is used to move the yarn connecting device 19 in a horizontal direction parallel to the drafting roller shaft 24, and a second actuator 22 is used to move the yarn connecting device in a transverse or radial direction perpendicular to the drafting roller shaft 24. Since the yarn connecting device 19 is hinged at the fulcrum 23, the tilt angle extension position of the second actuator 22 causes the yarn connecting device 19 to move in a transverse or radial direction perpendicular to the drafting roller shaft 24 as described above. Lowering or returning the second actuator 22 to its original position causes the yarn connecting device 19 to return from the drafting roller area.

[0042] In the connector arm 18, the yarn positioning device 12 is mounted so that the yarn connecting device 19 can move horizontally and radially about the front draft roller pairs 5a and 5b. The movement of the yarn connecting device 19 toward the front draft roller pairs 5a and 5b affects the movement of the left draft rollers 5a and 6a. Figure 7 The arrow indicates this, and for the right-side drafting rollers 5c and 6c... Figure 8 The arrows indicate this. If necessary, excessive movement of the first pneumatic / electric or screw actuator 21 can be controlled or limited by using the first stop 21'. Movement of the first stop 21' is controlled by another associated actuator 21″, which is vertically movable, such as... Figure 5 As shown. Similarly, excessive movement of the second pneumatic / electric or screw actuator 22 is also controlled or limited by using another stop (not shown). The cutter assembly 25 and associated actuator 26 are mounted behind the yarn splicing device 19 to perform a scissor operation for cutting excess length of the tail yarn 15 after splicing. The actuator 26 of the yarn cutter assembly 25 is preferably a pneumatic device and / or a hydraulic actuator or a screw actuator.

[0043] exist Figure 7 During the splicing operation shown, the tail yarn 15, captured by the tubular nozzle 16, is held in front of the front drafting roller pair 5a, 5b of the drafting unit 4 for the left drafting rollers 5a, 6a. Drafting roller 5b is not shown here for illustrative purposes. The splicing arm 18 now advances toward the drafting unit 4 together with the yarn positioning device 12, and thus the tail yarn 15 is hooked by the nose 20 of the yarn splicing device 19. Since the yarn is located on the middle surface of the front roller pair 5a, 5b, it must move around the front top roller 5a to perform the splicing activity. Therefore, the yarn splicing device 19 moves to the left of the front top roller 5a together with the carried tail yarn 15, and this position is achieved by extending the first actuator 21 to the left. Then, the second actuator 22 is raised from its original position to the retracted position, and thus the yarn splicing device 19 moves toward the top drafting rollers 5a, 6a together with the yarn. Thus, the nose 20 of the yarn splicing device 19 reaches the intermediate space between the first top drafting roller 5a and the second top drafting roller 6a. Then, the first actuator 21 is retracted, causing the splicing device 19 to move to the right. Therefore, the yarn carried by the nose 20 of the yarn splicing device 19 merges with the drafted fibers of the drafting rollers, and a splicing action is performed as indicated by the arrow. Simultaneously, the spindle brake is released to restore the yarn winding operation to the spool. Subsequently, the cutter assembly 25, located behind the yarn splicing device 19, is actuated by the cutter actuator 26 to cut excess or remaining yarn after splicing. After this splicing operation, the yarn splicing device 19 returns to its original position by reversing the corresponding first and second actuators 21, 22.

[0044] If yarn breakage occurs on the right side of the top drafting roller group 5c, 6c, 7c, then as follows Figure 8 As shown, the yarn splicing device 19, together with the tail yarn 15 it carries, moves to the right of the front top roller 5c, and this position is achieved by retracting the first actuator 21 to the right, at its maximum retraction position. Then, the second actuator 22 is raised from its original position to the retracted position, thus moving the yarn splicing device 19 and the yarn toward the top draft rollers 5c and 6c. The nose 20 of the yarn splicing device now reaches the intermediate space between the first right-side top draft roller 5c and the second right-side top draft roller 6c. Then, the first actuator 21 is extended, causing the splicing device to move to the left. Thus, the yarn carried by the nose of the yarn splicing device merges with the drafted fibers of the draft rollers, and a splicing action is performed as indicated by the arrow. Simultaneously, the spindle brake is released to restore the yarn winding operation to the spool. Then, the cutter assembly 25 cuts off any excess or remaining yarn after splicing. Subsequently, the yarn connecting device 19 returns to its original position by reversing the corresponding first and second actuators 21, 22.

[0045] The cutter assembly 25, mounted on the yarn splice arm assembly 17, includes a fixed blade member 27, a movable blade member 28, and a cutter assembly actuator 26. When the cutter assembly actuator 26 extends, the movable blade member 28 opens and closes relative to the fixed blade member 27 in a scissor-like motion. The movable blade member 28 has a generally V-shaped form, with one end connected to the cutter assembly actuator 26 via a connecting plate. A fulcrum joint 29 is provided to assist the scissor-like motion of the movable blade member 28 (indicated by arrows) during the extension and retraction of the cutter assembly actuator 26.

[0046] Figure 9 The image shows the position of the yarn splicing device 9 after the splicing operation according to the invention is completed, with the tail yarn 15 from the spool 8 connected to the drafted fiber bundle, and the spinning operation continuing. The splicing arm assembly 17 of the splicing device 9 is now returned to its original position, and the device is positioned for the next splicing cycle. Advantageously, the splicing device according to the invention effectively results in improved and accurate splicing of broken yarn ends because the splicing method is highly reliable and provides a high success rate.

[0047] In view of this disclosure describing the invention, all changes, modifications, and variations within the meaning and scope of equivalents are considered to be within the scope and spirit of the invention. It should be understood that the aspects and embodiments of the present disclosure described above can be used in any combination with each other. Several aspects and embodiments can be combined together to form further embodiments of the present disclosure.

Claims

1. A ring spinning machine (1), comprising at least one spinning station having a drafting unit and an automatic yarn splicing device (9), said automatic yarn splicing device (9) comprising: A lifting unit configured to lift a broken yarn from the spool (8) of the ring spinning machine (1); A suction unit (10) adapted to receive the broken yarn lifted by the lifting unit; wherein the suction unit (10) includes a tubular nozzle (16) adapted to receive the tail end (15) of the broken yarn by applying negative pressure through the tubular nozzle (16) before the drafting roller pair (5a, 5b) of the drafting unit (4) of the ring spinning machine (1), and A splicing unit (11) is configured to connect the tail end (15) of the broken yarn to a fiber bundle drawn by the drafting unit (4) of the ring spinning machine (1). The splicing unit (11) includes a positioning device (12) adapted to perform a splicing process by inserting the tail end (15) of the broken yarn into the drafting zone of the ring spinning machine in which the fibers are being drafted, thereby merging the tail end (15) of the broken yarn into the fiber bundle. The positioning device (12) is provided with a yarn connecting device (19) configured to control the yarn connection of the ring spinning machine via a set of pneumatic, hydraulic, or screw-type first and second actuators (21, 22). The drafting unit (4) is movable in the horizontal and transverse directions, and includes a set of stoppers (21′, 22′′) to limit excessive movement of the yarn splicing device (19), wherein the yarn splicing device (19) is hinged at a fulcrum (23) and includes a nose (20) adapted to move the tail end (15) of the broken yarn to a position between the front drafting rollers (5a, 5c) and the intermediate drafting rollers (6a, 6c) of the drafting unit (4) of the ring spinning machine (1) to perform overjoining.

2. The ring spinning machine (1) according to claim 1, characterized in that, The yarn splicing device (19) moves together with the tail end (15) of the broken yarn carried on it to the left side of the front drafting roller (5a) of the drafting unit (4), to the drafting rollers (5a, 6a) on the left side of the drafting unit (4), and to the right to perform over-splitting of the yarn break at the drafting rollers (5a, 6a) on the left side of the drafting unit (4).

3. The ring spinning machine (1) according to claim 1, characterized in that, The yarn splicing device (19) moves together with the tail end (15) of the broken yarn it carries to the right side of the front drafting roller (5c) of the drafting unit (4), moves to the drafting rollers (5c, 6c) on the right side of the drafting unit (4), and moves to the left to perform over-splitting of the yarn break at the drafting rollers (5c, 6c) on the right side of the drafting unit (4).

4. The ring spinning machine (1) according to claim 1, characterized in that, The connector unit (11) includes a cutter assembly (25) mounted near the yarn connection device (19) and adapted to perform a cutting operation on the excess length of the broken yarn. The cutter assembly (25) includes a fixed blade member (27), a movable blade member (28), and a cutter assembly actuator (26), wherein the movable blade member (28) performs a scissor action about the fixed blade member (27) around a pivot joint (29) to cut off the excess length of the broken yarn.

5. The ring spinning machine (1) according to any one of claims 1 to 4, further comprising: A spindle brake actuation mechanism is configured to apply a brake to the spindle of the yarn spool (8) during the yarn breakage.

6. An automatic yarn splicing method for a ring spinning machine (1), comprising the following steps: The broken yarn is lifted from the spool (8) of the ring spinning machine (1) by the lifting unit; The broken yarn, lifted by the lifting unit, is received by the suction unit (10), and a negative pressure is generated through the tubular nozzle (16) of the suction unit (10) so that the tubular nozzle (16) can receive the tail end (15) of the broken yarn before the drafting roller pair (5a, 5b) of the drafting unit (4) of the ring spinning machine; and The tail end (15) of the broken yarn is connected to the fiber bundle drawn by the drafting unit (4) of the ring spinning machine (1) through the splicing unit (11). The step of connecting the tail end (15) of the broken yarn to the drafted fiber bundle includes performing an overjoining process by inserting the tail end (15) of the broken yarn into the drafting zone of the ring spinning machine in which the fibers are being drafted, and thereby merging the tail end (15) of the broken yarn into the fiber bundle, by using a positioning device (12), by moving the yarn connecting device (19) with respect to the drafting unit (4) of the ring spinning machine in the horizontal and transverse directions by means of a set of pneumatic, hydraulic or screw-type first and second actuators (21, 22), and by means of a set of stops (21′, 22′′) to limit the excessive movement of the yarn connecting device (19). The insertion step is performed by moving the tail end (15) of the broken yarn to a position between the front drafting rollers (5a, 5c) and the intermediate drafting rollers (6a, 6c) of the drafting unit (4) through the nose (20) of the yarn connecting device (19).

7. The method according to claim 6, characterized in that, The yarn splicing device (19) and the tail end (15) of the broken yarn it carries move to the left of the front drafting roller (5a) of the drafting unit (4) of the ring spinning machine (1), move to the left of the drafting roller (5a, 6a), and move to the right to perform over-splitting of the broken yarn at the drafting roller (5a, 6a) on the left side of the drafting unit (4) of the ring spinning machine (1).

8. The method according to claim 6, characterized in that, The yarn splicing device (19) moves together with the tail end (15) of the broken yarn carried on it to the right side of the front drafting roller (5c) of the drafting unit (4) of the ring spinning machine (1), to the drafting roller (5c, 6c) on the right side of the drafting unit (4) of the ring spinning machine (1), and to the left to perform over-splitting of the yarn breakage at the drafting roller (5c, 6c) on the right side of the drafting unit (4) of the ring spinning machine (1).

9. The method according to claim 6, further comprising the following step: The excess length of the broken yarn is cut off by the cutter assembly (25) after the joint.

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