DESC:FIELD OF THE INVENTION
[001] The invention relates to an auto piecing system, more particularly to an auto piecing system for a textile ring spinning machine.

BACKGROUND OF THE INVENTION
[002] Ring spinning is a method of spinning fibres, such as cotton, flax and/or wool, to make yarn. A ring spinning machine spins a yarn from a roving yarn supplied by a speed frame and the yarn is then wound onto a cop The ring spinning technique is normally a labour-intensive method. In textile ring spinning machines, the yarn is produced yarn from the fibres which are drafted and twisted and then wound on a cop or bobbin using different active parts. Yarn breakage is a common and well-known problem that happens on a ring spinning technique. The yarn breakage also requires continuous attention of the workforce, and it is a major disadvantage in ring spinning machines.
[003] Yarn breakages frequently occur in these ring spinning machines due to various factors such as low-quality materials, high machine speeds, heat generated during spinning, and other operational parameters. The detection and immediate rectification of yarn breakages are critical to avoid production losses. Conventionally, manual labour has been employed to continuously monitor spinning machines and identify yarn breakages. When a breakage is detected, workers must swiftly address the issue, which becomes a labour-intensive and time-consuming process. The workers may also be responsible for finding defective spindle occurrences that may include but not limited to a yarn breakage. The broken yarns must be pieced manually and the yarn spinning sequence must be restarted then and there after yarn breakage to avoid wastage of yarn.
[004] However, as workers are involved, the process of monitoring and ensuring the ring spinning machine for detecting and handling defects is not effective and involves substantial delay in detection of the above defects, and even if the defect is detected, attending such defects is a time-consuming process. Further, if the defect occurs at multiple points in the machine, it is very difficult to attend the same by a single worker. In the present scenario, one worker is directed to manage multiple ring spinning machines. Hence, additional workers are required to be directed towards managing these ring spinning machines which render these interventions to be unreliable and ineffective.
[005] In textile application the skilled workers must arrange the piecing operation for each end every breakage of the yarn during running of the machine which is laborious, consumes more time and production loss. A single ring frame of the ring spinning machine consists of more than 1008 spindles and extend up to 75 meters in length, further complicating defect detection and increasing labour costs.
[006] To overcome limitations related to worker availability and piecing requirements, auto piecing system are available as an alternative towards the conventional techniques of manual piecing in ring spinning machine. Such auto piecing having the multi axis of moving components which has inbuilt drive and pivoted levering robotic arm movement with electrical and pneumatic actuators mechanism in a piecing assembly movable along the length of the ring spinning machine.
[007] In one prior approach, an auto piecing machine is fixed in one side of the ring frame and two numbers are covered in one ring frame. One single Auto piecing system per side is designed to run the entire length of the ring frames and it covers number of spindles based on the broken yarn spindle location, such auto piecing system are moved based on the signal for piecing process/ operation and return to their home position or it is continuously running on the railing to the entire length of the ring spinning machine after completion of the piecing process.
[008] Another approach to using a yarn piecing apparatus is disclosed in IN 20204102159, where the automatic yarn piecing apparatus (9) of a textile ring spinning machine (1) is disclosed. The automatic yarn piecing apparatus (9) enables a method of piecing the broken yarns to drafted fibre strands. The yarn piecing apparatus (9) comprises a lifting unit for lifting the broken yarn from the cop (8), a suction unit (10) adapted to accommodate the broken yarn lifted by the lifting unit, and a piecing system (11) configured to join a tail end (15) of the broken yarn to a fibre strand drafted by a drafting unit (4). The piecing system (11) comprises a positioning device (12) adapted to perform an over-piecing process to merge the tail end (15) of the broken yarn to the fibre strand. The positioning device (12) is provided with a yarn joining device (19) configured to move in horizontal and traverse directions with respect to the drafting unit (4) to perform over-piecing.
[009] Another approach is disclosed in CN 102560770 B where the automatic detection of yarn breakage, automatic piecing method and apparatus is disclosed. The apparatus and method comprise of a yarn breakage automatic detection means, an automatic piecing method means, a ring rail flanking additional rail and dolly, moving trolley carrying wire spool. The controller controls the moving carriage and reciprocates on the guide rail, an inductance coil probe detection off head, robot will use the intercepted virtual strip length of wire and yarn pipe for piecing the broken yarn.
[010] Yet another approach is disclosed in EP0421157B1. The patent discloses a ring spinning machine having means for spinning a yarn from a roving supplied by a fly frame and for winding said yarn onto a cop, further disclosing a travelling service carriage which carries an auxiliary bobbin with an auxiliary yarn, from which, in the event of rectification of a yarn break, a piece of yarn is applied to the cop and pieced to the roving. The service carriage is provided with means for monitoring the success of an attempt to rectify a yarn break. The means are connected to a control unit with controls means on the service carriage for removing from the cop a piece of auxiliary yarn used in a failed attempt before a further attempt is made to rectify the yarn break.
[011] Accordingly, a common approach as per the above noted patent documents is that an auto piecing system in the form of a movable vehicle with guiding mechanisms are used to piece the broken yarn. However, in the existing systems, a single auto piecing system performs the elaborate piecing process for the entire length of the ring spinning machine, which can range from 40 to 75 meters. This approach results in reduced productivity of the ring spinning machine, increased processing time, and excess waste, particularly in the form of pneumafil waste. Furthermore, manual intervention and use of trained workers for each of these piecing operations or for identifying the broken yarn is also a concern. Furthermore, a ring spinning machine having a large number of spindles might not be even serviced properly by a single piecing operation/machine.
[012] Accordingly, it is a need for an auto yarn piecing system that enables a constant piecing efficiency of the spindle in the ring frame, eliminate the time delay for piecing and avoid roving wastage during the piecing process.

SUMMARY OF THE INVENTION
[013] Embodiments of the present invention disclose an auto-piecing unit for a ring spinning machine and a method of auto-piecing performed using the auto-piecing unit. In one embodiment, the auto-piecing unit comprises a suction nozzle to capture a broken yarn from a cop/bobbin in the spindle and to thread the broken yarn into one or more guide elements of the ring spinning machine, wherein the broken yarn is disentangled from a cop/bobbin in the spindle. A plurality of actuators are present in the auto piecing unit to move the suction nozzle to capture the broken yarn from the cop/bobbin in the spindle. A yarn latch is configured to grip a tail end of the broken yarn that is captured by the suction nozzle and a yarn tensioner lever positions the tail end of the broken yarn and a yarn latching kit holds the tail end of the broken yarn and move the broken yarn in swiveling direction for threading the broken yarn.
[014] In another embodiment, a method of auto-piecing is disclosed. The method comprises detecting a broken yarn in a cop/bobbin attached to the spindle; blowing up air from bottom of the spindle to disentangle a portion of the broken yarn from the spindle; capturing the broken yarn from the cop/bobbin using a suction nozzle; positioning a tail end of the broken yarn for threading; and threading the positioned tail end of the yarn into one or more guide elements of the ring spinning machine. Other embodiments are also disclosed.

BRIEF DESCRIPTION OF THE DRAWINGS
[015] Reference will be made to embodiments of the invention, examples of which may be illustrated in accompanying figures. These figures are intended to be illustrative, not limiting. Although the invention is generally described in context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
Figure 1A shows a front view of an auto piecing system for a ring spinning machine in accordance with an embodiment of the invention.
Figure 1B shows an angular view of an auto piecing system arrangement for a ring spinning machine in accordance with an embodiment of the invention.
Figure 2A shows an auto piecing system in accordance with an embodiment of the invention.
Figure 2B shows a side view of an auto piecing system in accordance with an embodiment of the invention.
Figure 2C shows another side view of an auto piecing system in accordance with an embodiment of the invention.
Figure 2D shows another side view of an auto piecing system in accordance with an embodiment of the invention.
Figure 2E shows a front view of an auto piecing system in accordance with an embodiment of the invention.
Figure 3A shows an exploded view of a spindle of an auto piecing system in accordance with an embodiment of the invention.
Figure 3B shows another exploded view of a spindle of an auto piecing system in accordance with an embodiment of the invention.
Figure 4 shows a side view of an auto piecing system during operation in accordance with an embodiment of the invention.
Figure 5 shows a flow chart for performing the actions related to auto piecing a broken yarn in accordance with an embodiment of the invention.

DESCRIPTION OF THE INVENTION
[016] The present invention provides an auto piecing system for a ring spinning machine, whereby an individual auto piecing system is provided for each spindle of a ring frame in the ring spinning machine.
[017] An object of the present invention is to develop an Individual auto yarn piecing system fixing in front/back of each spindle and capable of piecing the yarn in every spindle to delivery fibre strands in ring spinning machines and its methodology.
[018] Another object of the present invention is to provide an Individual auto yarn piecing system with actuator, cylinders, motors, nozzles, and yarn tensioner levering mechanism capable of increasing the accuracy of the linear movement and its methodology.
[019] Further object of present invention is to provide the sliding, extraction, and retraction, angular, reciprocating, linear and rotary movement mechanism for Individual auto yarn piecing system with integration of end break sensing system for textile ring spinning machines. Further object of present invention is to provide yarn holding suction device, latching system, pressurised air blowing kit and tensioner arrangement using electrical/mechanical/electronic/pneumatically/motor/actuator controlled for Individual auto yarn piecing system with integration of end break sensing system and upgraded system of roving stop motion for ring spinning machine. Yet another object of present invention is to provide integrated features of an individual auto piecing system solution and programmed automatic electromechanics control the entire operation of the rotation/ tilting/ linear/ reciprocating mechanism used in this machine unit to maintain the constant piecing efficiency of each spindle in the ring frame and avoid the any modification of the existing overhead travelling cleaner, eliminate the losses, more time-consuming process.
[020] Another object of present invention is to introduce the small railing arrangement near the spindles with suitable clamping levering attachment to maintain the consistence of efficiency, safety and cost effectiveness and less space utilisation in Individual auto piecing system.
[021] The present invention relates to an Individual auto yarn piecing system apparatus with electrically/mechanically/electronically/pneumatically operated mechanism provided for each spindle of the Ring spinning machine for piecing broken yarn ends in textile ring spinning machines.
[022] More particularly, the invention deals with handling the piecing of broken yarns in an Individual auto yarn piecing machine of textile ring spinning machines and its methodology with /without integrated end breakage sensing system/spindle monitoring system and roving stop motion mechanism.
[023] The present invention of an Individual auto piecing system is disclosed to achieve the above-mentioned objects for a ring spinning machine.
[024] This individual auto yarn piecing system has actuators, cylinders, and motors-controlled sliding, turning, rotation, angular movement and up and down moving kit for catching the broken yarn from the wounded cop of the Ring spinning machine using multi point orifice blow tube and its suction tunnel/section nozzle, and then rotating arm is joining an end of the broken yarn to drafted fibre strand of the ring spinning machine. The rotating yarn tensioner unit is provided and configured to movement of multi directions with respect to the drafting location to perform over-piecing.
[025] In the present invention, the individual auto piecing system includes a suction section nozzle connected with vacuum assembly and yarn sensing device.
[026] This assembly performs to control the sucking limit for excess length of the broken yarn to avoid the cutting operation of yarn. This includes a poly carbonate/nylon/PVC/aluminium/steel vacuum tube, flexible hose, collecting box and a yarn sensor. The yarn sensor performs to stop the suction and avoid the excess yarn enter the collecting box. The Yarn latching, actuator and its mechanism performs to control, measure and monitor the movement of the ring rail displacement.
[027] According to the present invention, the rotary cylinder operated angular actuator is provided to control the rotation of the section nozzle and yarn latching system.
[028] According to the present invention, the motor-controlled yarn nozzle is hinged with spring actuating mechanism and to move the tail end of the broken yarn by the indexing system in between the front rollers and the middle rollers for the piecing process. The nozzle along with carried yarn is moved both left and right sides of the rollers to perform the piecing for yarn breakage according to the required directions of the operation.
[029] In the present invention, the suction nozzle is provided with the actuating cylinder, poly carbonate tube/steel/ aluminium/PVC tube is connected to suck the tail end of the broken yarn and stop the suction effect after sensing the yarn by the sensor to avoid the cutting of the excess yarn. The tail end of the broken yarn is caught by the yarn nozzle by applying a suction and indexing/angular/linear/rotating movement.
[030] According to the present invention, the electronic control device of the individual auto piecing system is logically programmed to suit/integrate/control the function of overhead travelling cleaner based on the auto piecing system direction of traverse movement and function in the ring spinning machine during piecing process/operation.
[031] Figures 1A and 1B show an auto piecing system arrangement for a ring spinning machine in accordance with an embodiment of the invention. As shown, an individual auto piecing system is arranged for every spindle of the ring frame and covers all spindles at both sides of the ring frame in the ring spinning machine. Each of the auto piecing systems 106 is arranged on a rail guide for the entire length of the ring frame. The rail guide comprises a clamping lever mechanism to securely mount each auto piecing system 106 onto the rail guide. Further, each of the auto piecing system 106 comprises a screw rod, servo, stepper motor, pneumatic control with link rod mechanism sliding and up and down to facilitate catching of the broken yarn from the spindle 104 using a suction nozzle (shown in figures 2A, 3A,3B) for joining a tail end of a broken yarn to a drafted fibre strand in a drafting assembly 102.
[032] Each auto piecing system 106 is equipped with automatic electro-mechanical control mechanisms and a rolling arrangement, allowing for smooth and precise operation. Moreover, each of the auto piecing system 106 comprises moving elements positioned on the rail guide for multi-directional and axial movements to facilitate the over-piecing process of the broken yarn. The rail guide comprises a sensor (not shown) for each auto piecing system 106. The sensor is configured to monitor and control an upward and downward movement of the auto piecing system 106 along the rail guide. Additionally, the sensor is further configured to measure the displacement of the suction nozzle explained below for optimal piecing performance. The enlarged view of the single auto piecing system and the working of the single auto piecing system is explained with respect to Figures 2A-2E below.
[033] Figures 2A-2E illustrates a single auto piecing system 200 provided to each spindle of the ring spinning machine in different views.
[034] As shown in Figure 2A, the auto piecing system 200 contains a base plate 201 having a sliding arrangement on the railing. The sliding arrangement contains a pair of linear actuators: an X-axis linear actuator 202 and a Y-axis linear actuator 203. The single auto piecing system 200 contains a rotary cylinder 204, an angular actuator 205, a link set 206 and a motor 209. As illustrated in figure 2B and 2C, the X-axis linear actuator 202, Y-axis linear actuator 203 along with the rotary cylinder 204 and the angular actuator 205 facilitate the movement of the auto piecing system 200 in x-y-z axes, according to the requirement. The auto piecing system 200 also contains a blowing linear actuator 210, a yarn tensioner lever 211, a yarn latching kit 212, a tilting motor 213 and flat rotary cylinder 215. The blowing linear actuator 210 and the flat rotary cylinder 215 are provided to operate the yarn tensioner lever 211 during an over-piecing process. The tilting motor 213 facilitates the movement of the yarn latching kit 212 in X-Y direction as required.
[035] Figure 2B illustrates the yarn latching kit shown folded in assembly and Figure 2C illustrates the yarn latching kit shown unfolded in assembly.
[036] Figures 2D and 2E illustrate a side view and front view of the auto piecing system 200, respectively.
[037] The operation of the auto piecing system is explained herewith. When a broken yarn is detected on the spindle by the sensor located on the ring rail, the spindle is stopped from rotating. A breaking lever (not shown) placed at the bottom of the auto piecing system and connected with an air cylinder (not shown). The breaking lever is used to stop the spindle from rotating. The breaking lever on actuation arrests the spindle rotation by actuating the cylinder to start the piecing process of the broken yarn. In a preferred embodiment, the braking lever operates with time delay according to the compressed air delivered from a multi-point orifice tube 214.
[038] During the operation of the auto piecing system, the motor 209 guides and rotates the yarn latching 208 and the suction nozzle 207 to maintain the orientation and smooth capture of the broken yarn and insert the broken yarn into the roller machine. In one embodiment, the end breakage yarn sensing sensor enables the identification of broken yarn. Once the broken yarn is identified, then the single auto piecing system 200 actuates in front of the spindle location and the multi orifice blow tube 214 to blow the compressed air at the bottom (upstream) of the spindle to loosen the broken yarn from the cop / bobbin,
[039] The suction nozzle unit 207 draws the broken yarn by suction force from the cop/spindle, moves the broken yarn into a poly carbonate tube/PVC/steel to stop the travel of the yarn based on the desired length. The suction nozzle 207 is used for catching the broken yarn from the nozzle, inserting the yarn into a traveller, ABC ring and lappet, and a suction nozzle for holding the yarn until the completion of the joining, and a suction nozzle 207 for joining the broken tail end of the yarn to the drafted fibres in the drafting assembly of the ring spinning machine.
[040] The actuator and motor operated suction nozzle 207 moves from its initial position to towards the ring spinning machine, hence the tail broken yarn 220 is carried forward up to the drafting rollers. The tail broken yarn is brought up to front drafting roller pair of the drafting roller assembly and join the tail broken tail end yarn with the drafting fibre strand between the drafting rollers and to complete the piecing process of the cop for the identified spindles of the ring spinning machine.
[041] The manner in which the single auto piecing system performs the auto piecing operation is explained with respect to Figures 3A and 3B below. As illustrated in figure 3A, when a broken yarn 320 is detected on the spindle by the sensor located on the ring rail, a brake lever 317 positioned at the bottom of the auto piecing system 300 is activated to halt the rotation of the spindle 317. Simultaneously, a multi-orifice blow tube 316 (214), also situated at the bottom of the auto piecing system 300, releases a stream of compressed air. The compressed air from the multi orifice blow tube 316 (214) loosens the tail end of the broken yarn 320 of the yarn 318 from the spindle 317 to facilitate over-piecing of the yarn 318. The braking lever 317 operates simultaneously with the multi point orifice tube 316. Only when the brake lever 317 is engaged the multi orifice blow tube 316 supplies compressed air.
[042] As illustrated in Figure 3B, the yarn tension lever is for stretching a part of the yarn. For example, the yarn tensioner lever 322 is a pair of yarn guide rods. The yarn tensioner lever 322 positions the tail end of the broken yarn parallel to a tangent of a traveller guide 326 of the ring spinning machine. Referring to figures 3A and 3B, the yarn latching lever 321 moves the tensioned part of the broken yarn in a swivelling direction. For example, the yarn latching lever 321 holds the tail end of the broken yarn and moves in swivelling direction, whereby the loose end of the held yarn is threaded into guide elements of a ring spinning machine.
[043] As illustrated in Figure 3B in conjunction with Figures 1A and 3A, the auto piecing system 200 further comprises the suction nozzle 207 and a yarn latch 208. The suction nozzle 207 draws the broken yarn from the spindle 317 and guides the yarn into a poly carbonate tube (not shown) based on the desired length. The link set 206 and the motor 209 are provided for moving the suction nozzle 207 in horizontal, vertical, and angular direction, which is parallel to drafting rollers during the entire over-piecing process for individual spindle. Specifically, the suction nozzle 207 is operated in an indexing method which is a horizontal movement including left to right angular movement towards the drafting rollers or away from it based on the programmable path of the indexing. Thereafter, the suction nozzle 207 inserts the tail end of the broken yarn into a traveller guide 326, an ABC ring 314 and a lappet 216. The yarn latch 208 is provided for gripping the loose end of a yarn that is sucked in the suction nozzle 207. The yarn latch 208 ensures that extra yarn is not drawn into the suction nozzle 207 thereby eliminating wastage of the yarn. Thereafter, the suction nozzle 207 delivers the tail end of the broken yarn to the drafting rollers joining the tail end of the broken yarn to the drafted fibres in the drafting assembly of the ring spinning machine.
[044] The X and Y axis linear actuators 202,203 respectively, rotary 204, angular 205 cylinder facilitate the movement of the said yarn positioning assemblies in x-y-z directions, according to the requirement. The indication micro lamp is to indicate the function of the process and the actuators are used to control the y axis of the yarn tension lever 211.
[045] An isometric view of the yarn latching kit 212 assembly as shown in Fig. 2C according to the present invention is shown in Figs. 2A to 3B of the drawings.
[046] The yarn latching kit and yarn tension lever assembly as shown comprises a piecing which is provided for yarn positioning and tensioning, wherein a suction nozzle 207 is provided for handling the yarn received from the cops. The motor operated suction nozzle 207 is operated in a horizontal movement in either of left to right angular movement or right to left angular movement towards the rollers or away from it. The movement of the suction nozzle is based on the programmable path of the indexing. A rotary cylinder 204 with spring operated is provided to blow the compressed air into the bottom of the spindle to locate the ring traveller at correct position to insert the yarn into the traveller. A motor 209 and the link set 206 are used to move the suction nozzle in horizontal, vertical, and angular direction, in parallel direction to drafting rollers to the entire of the piecing process for individual spindle. Since the suction nozzle is hinged with yarn latching device and link set 206, the inclined angle extended position based on the calculated value of the program and it moves in traverse or radial direction, which is perpendicular to drafting rollers. The special sensor (not shown in figure) is provided to monitoring and control the displacement of the rail lowering and upper movement and measuring the displacement of the movement also.
[047] According to the invention, the full wounded cop is placed inside the individual auto piecing system, and it is used to piece the yarn and after completion of each doffing process by using the actuating lever mechanism.
[048] The present invention illustrates the manner in which the broken portion of the tail yarn from the cop is held in the suction nozzle. When the auto piecing system moves towards the spinning spindle location in case of yarn breakage, a spindle brake actuating levering mechanism applies brake to the running spindle of the rotating cop. A suction force is created due to the vacuum at inside of the nozzle and the tail yarn from the cop is carried by the suction nozzle itself for a predetermined period during piecing action.
[049] The individual auto yarn piecing having an actuator levering mechanism, can be realized as one or multiple arms of a mechanism controlled by the rotary, linear and angular linear actuator.
[050] The levering mechanism can be moved combined with pneumatic, mechanical, and electronically. The yarn tensioner holding a yarn can allow for threading this yarn into the traveller and ABC ring through the yarn guide rod and yarn holding tube. The yarn holding tube means can comprise the suction and connected with mechanical block with spring, whose movement are used for piecing together a held yarn and a loose end of a yarn thus being part of the yarn piecing into the yarn and the suction effect maintain continuously until the piecing process completed. The yarn threading can comprise the first yarn threading; the yarn piecing can comprise both first and second yarn threading. For the entire application, the suction can be used synonymously with a suction tube and the drafted material can be provided by a ring spinning machine, wherein the drafted material is typically provided by delivery rollers of the spinning machine.
[051] After completion of the over-piecing of the broken yarn, the braking lever is released, and the spindle resumes the rotation to continue yarn winding operation onto the spindle.
[052] Figure 5 illustrates the method steps that take place during the auto-piecing of the broken yarn in a ring spinning machine. At step 510, the broken yarn is detected in a spindle. Once the broken yarn is detected, the spinning of the spindle is halted by using a braking mechanism. The broken yarn in the ring spinning machine is identified by an end breakage yarn sensing sensor. At step 520, the broken yarn is freed by blowing up air from the bottom of the spindle and at step 530 the broken yarn is captured using a suction nozzle. At step 540, the tail end of the broken yarn is positioned for threading by inserting the tail end of the broken yarn into a traveller guide, an ABC ring (314) and a lappet (216). and at step 550, the loose end of the broken yarn is threaded onto one or more guide elements of the ring spinning machine by taking the tail end of the broken yarn to the drafting rollers joining the tail end of the broken yarn to a set of drafted fibers in a drafting assembly of the ring spinning machine.
[053] Some of the non-limiting advantages of present invention are provided as below:
1. The system is introduced for each spindle individually in ring spinning machines at both sides and placed on the small tube railing system to place the Individual auto piecing system. All the auto piecing systems are placed on the same railing arrangement with drive and power control system. Actuation of all the mechanism and its assembly elements are fixed on the mounting plate which is the only surface contact on the angle and the system works on multiple directions by actuating the motors and cylinders which is assembled with the attachment of guide ways. The sensors are placed with mounting plates to control the displacement of the axial movement. The multi axis screw rod systems are used to operate the movement of the suction device, levering system, blowing air tubes, and latching system at specified time and distance.
2. When the auto piecing system starts the yarn breakage spindle, the actuation assembly mechanism actuated by the motor and cylinder and its oscillating tube, one end of the system is directly fixed on the plate with mechanical components /square block and other end is free to operate the system. The motor and cylinder assembly are directly connected with shaft, and it fixed with blowing plate. When the auto piecing system is operating, there is no need to change any modification in the design of blowing pipe on the overhead travelling system and its nozzles for its working and return to its original position due to this invention is the compact. Since the auto piecing system is placed for each spindle, there is no need to travel the piecing system to entire length of the ring spinning machine.
3. In the existing design of Auto piecing arrangement, it is mandatory to change the design of overhead travelling cleaner to avoid the hitting to piecing system and the nozzles which are fixed blowing pipe cannot be disturbed in any direction and position for its next cycle of operation. Despite having an automatic detection of the defects in the machine, the workers are involved for attending the defects i.e., the workers move to that location and then the workers attend to the defects. However, due to the involvement of the workers in the process, these worker interventions are not reliable, effective, and efficient. The proposed system can decrease production losses; and increase effectiveness, efficiency of the yarn production processes and there is no need to travel to the Auto piecing system to run the entire length of the Ring spinning machine to cover all the spindles.
4. By using this auto piecing system and its mechanism, the system does not have any surface contact on the ring rail and provides a perfect sliding operation for every horizontal, angular, linear, vertical movement with respect to the origin movement to support the piecing process. Due to the non-surface contact, the marking and the damage on the ring rail will not happen and subsequently the free movements are ensured.
5. If the travelling machine runs without this integrated mechanism in auto piecing system, the nozzle, and hoses hits in every cycle of travelling and it creates the marking, damages and it will not allow the working function of piecing system. By using this mechanism, the total design changes of overhead travelling cleaner and its hinderance problem can be eliminated.
6. By using this system, the piecing efficiency of the machine is improved.
[054] The foregoing description of the invention has been set merely to illustrate the invention and is not intended to be limiting. Since the modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to the person skilled in the art, the invention should be construed to include everything within the scope of the disclosure.
,CLAIMS:We claim:
1. An auto piecing unit for a spindle in a ring spinning machine, comprising:
a suction nozzle (207) configured to capture a broken yarn from a cop/bobbin in the spindle and to thread the broken yarn into one or more guide elements of the ring spinning machine, wherein the broken yarn is disentangled from a cop/bobbin in the spindle;
a plurality of actuators (202, 203, 205) configured to move the suction nozzle (207) to capture the broken yarn from the cop/bobbin in the spindle;
a yarn latch (208) configured to grip a tail end of the broken yarn that is captured by the suction nozzle (207);
a yarn tensioner lever (211) configured to position the tail end of the broken yarn; and
a yarn latching kit (212) configured to hold the tail end of the broken yarn and move the broken yarn in swiveling direction for threading the broken yarn.

2. The auto piecing unit as claimed in claim 1, wherein an end breakage yarn sensing sensor is configured to detect a broken yarn in the cop/bobbin.

3. The auto piecing unit as claimed in claim 1, wherein the broken yarn is disentangled from the cop/bobbin in the spindle by stopping the spindle and blowing up air from bottom of the spindle.

4. The auto piecing unit as claimed in claim 4, wherein a braking lever is configured to stop the spindle from rotating, and a multipoint orifice tube (214) is configured to deliver compressed air to disentangle a portion of the broken yarn, wherein the compressed air is delivered only on engaging the braking lever.

5. The auto piecing unit as claimed in claim 1, wherein the suction nozzle (207) is configured to insert the tail end of the broken yarn into a traveller guide (326), an ABC ring (314) and a lappet (216).
6. The auto piecing unit as claimed in claim 1, wherein a yarn tension lever (322) is configured to position the tail end of the broken yarn parallel to a tangent of a traveller guide (326) of the ring spinning machine.

7. The auto piecing unit as claimed in claim 1, wherein a tilting motor (215) is configured to control the movement of the yarn latching kit (212) to move the broken yarn in swiveling direction for threading the broken yarn.

8. The auto piecing unit as claimed in claim 1, wherein a sensor is configured to track the movement of the suction nozzle (207).

9. The auto piecing unit as claimed in claim 1, wherein the suction nozzle (207) is configured to join the tail end of the broken yarn to a set of drafted fibers in a drafting assembly of the ring spinning machine.

10. The auto piecing unit as claimed in claim 1, wherein the auto piecing unit is arranged on a rail guide for the entire length of the ring frame of the ring spinning machine.

11. A method of auto piecing a broken yarn at a spindle in a ring spinning machine, the method comprising:
detecting (510) a broken yarn in a cop/bobbin attached to the spindle;
blowing (520) up air from bottom of the spindle to disentangle a portion of the broken yarn from the spindle;
capturing (530) the broken yarn from the cop/bobbin using a suction nozzle;
positioning (540) a tail end of the broken yarn for threading; and
threading (550) the positioned tail end of the yarn into one or more guide elements of the ring spinning machine.

12. The method as claimed in claim 11, wherein positioning the tail end of the broken yarn for threading comprises:
inserting the tail end of the broken yarn into a traveller guide (326), an ABC ring (314) and a lappet (216); and
joining the tail end of the broken yarn to a set of drafted fibers in a drafting assembly of the ring spinning machine.

13. The method as claimed in claim 11, wherein the tail end of the broken yarn is positioned parallel to a tangent of a traveller guide (326) of the ring spinning machine.

14. The method as claimed in claim 11, wherein blowing up air from bottom of the spindle to free the broken yarn from the spindle, comprises:
monitoring a displacement of rail lowering in the ring spinning machine; measuring a displacement of the spindle in the ring spinning machine for initiating an auto piecing operation;
stopping the rotation of the spindle; and
blowing a stream of compressed air at the bottom of the spindle through an multi orifice blow tube (214) to disentangle the broken yarn from the cop / bobbin.

15. The method as claimed in claim 14, wherein the suction nozzle is moved to capture the broken yarn based on the displacement of the spindle.

Dated this 10th day of August 2023
Lakshmi Precision Technologies Limited
By their Agent & Attorney

(Adheesh Nargolkar)
of Khaitan & Co
Reg No IN/PA-1086