DESC:FIELD OF THE INVENTION
[001] This disclosure is related to roving stop device, and a method of utilizing the roving stop device for lifting the rollers/create the gap between the rollers for roving stop motion in a ring spinning machine.

BACKGROUND OF THE INVENTION
[002] A ring spinning machine typically enables spinning of fibres into yarn. A ring spinning machine typically has plurality of rollers that takes in a long and narrow bundle of fibres called roving to convert into a yarn.
[003] Typically ring spinning machines have multiple rollers: a rear drafting roller, a middle drafting roller and a front drafting roller. It is observed that the roving yarn breaks between the rear drafting roller and middle drafting rollers. Due to the above breakage of roving yarn, the supply of roving yarn between the rear and middle draft rollers, it is necessary to perform a reset to resume the supply of roving. A piecing operation must be performed to “piece” the broken yarn between the middle and rear draft rollers. To resume the supply of roving yarn, the operator needs to take the roving yarn manually between the rear drafting roller and middle drafting roller and then insert the broken yarn to the middle drafting roller to continue the supply of the roving yarn to produce yarn in a ring spinning machine. The roving yarn will take time to pass through the middle draft rollers and then followed by front draft rollers during the time of piecing operation. However, the distance between spindles of the ring spinning machine is narrow and it is difficult to handle manually to insert the roving yarn in middle draft rollers to resume supply of roving yarn. It needs skilled operator to handle the issue, time consuming process and production losses.
[004] To overcome the above difficulties, a roving stop device to stop a set of rollers and a detent device to control the use of the roving stop device are suggested. One such roving stop device is disclosed in European Patent publication EP4095295 A1. The patent application discloses a roving stop assembly for a drafting frame of a ring spinning machine, including a roving detent element arranged to be able to act, in an active position, on one of said pair of rear drafting rollers or middle drafting rollers. There are trigger means operably connected to the at least roving detent element to trigger actuation of the at least roving detent element to an active position and reset means for resetting by means of a resetting mechanism the at least roving detent element to an inactive position to resume the supply of roving. The reset means includes a reset actuator arm arranged at the front of the drafting frame. However, the way in which the reset means, and the roving detent elements are engaged and disengaged are complicated and may require additional configurations.
[005] Accordingly, it is a requirement to have a roving stop device and method of using such roving stop device to ensure minimal manual intervention and continuous production of the roving yarn.

SUMMARY OF THE INVENTION
[006] In an embodiment, a roving stop device for a ring spinning machine is disclosed. The roving stop device comprises a pair of clamps for mounting onto a drafting frame of the ring spinning machine, wherein the pair of clamps are placed at either end of the roving stop device. The roving stop device has an electrical sensor and its circuit board to detect a motion of a ring traveller in the ring spinning machine for identifying continuous filaments of roving yarn and a roving detent element placed between a set of rear drafting rollers and a set of middle drafting rollers of the ring spinning machine. The roving stop device also has an activating/deactivating element configured to activate the roving detent element on detection of breakage of roving yarn, wherein the roving detent element moves between the set of rear drafting rollers and the set of middle drafting rollers to disengage the rear drafting rollers and the middle drafting rollers such that the roving yarn discontinues between the rear drafting rollers and middle drafting rollers.
[007] In one embodiment, the activating/deactivating element is a pneumatic cylinder that is configured to activate the roving detent element on detection of breakage of a roving yarn, wherein the roving detent element moves between the set of rear drafting rollers and the set of the middle drafting rollers to disengage the rear drafting rollers and the middle drafting rollers and the roving yarn discontinues between the rear drafting rollers and middle drafting rollers.
[008] In one embodiment, a geared motor is an activating/deactivating element that configured to rotate in clockwise direction to activate the roving detent element on detection of breakage of roving yarn, wherein the roving detent element moves between the set of rear drafting rollers and the set of middle drafting rollers to disengage the rear drafting rollers and the middle drafting roller such that the roving yarn discontinues between the rear drafting rollers and middle drafting rollers.
[009] In one embodiment, an electrical actuator is the activating/deactivating element. The electrical actuator on forward stroke activates the roving detent element on detection of breakage of roving yarn, wherein the roving detent element moves between the set of rear drafting rollers and the set of middle drafting rollers to disengage the rear drafting rollers and the middle drafting rollers such that the roving yarn discontinues between the rear drafting rollers and middle drafting rollers.

BRIEF DESCRIPTION OF THE DRAWINGS
[010] 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 embodiments:
Figure 1 illustrates a roving stop device employed in a ring spinning machine with the components of the roving stop device, in accordance with an embodiment of the invention.
Figure 2 illustrates a roving stop device in accordance with an embodiment of the invention.
Figure 3 illustrates the manner in which the roving stop device is employed in a ring spinning machine in accordance with an embodiment of the invention.
Figure 4 illustrates a right perspective view of a roving stop device that uses a geared motor as an activating/deactivating element in accordance with an embodiment of the invention.
Figure 5 illustrates a left perspective view of the roving stop device that uses a geared motor as an activating/deactivating element in accordance with an embodiment of the invention.
Figure 6 illustrates a view of the roving stop device that uses a geared motor as an activating/deactivating element in accordance with an embodiment of the invention.
Figure 7 illustrates the manner in which the roving stop device with a geared motor is employed in a ring spinning machine in accordance with an embodiment of the invention.
Figure 8 illustrates a right perspective view of a roving stop device that uses an electrical actuator as an activating/deactivating element in accordance with an embodiment of the invention.
Figure 9 illustrates a left perspective view of the roving stop device that uses an electrical actuator as an activating/deactivating element in accordance with an embodiment of the invention.
Figure 10 illustrates a view of the roving stop device that uses an electrical actuator as an activating/deactivating element in accordance with an embodiment of the invention.
Figure 11 illustrates the manner in which the roving stop device with an electrical actuator is employed in a ring spinning machine in accordance with an embodiment of the invention.
Figure 12A illustrates a view of the roving stop device that uses an electrical actuator as an activating/deactivating element in accordance with an embodiment of the invention.
Figures 12B-12D illustrates an exploded view of the mounting clamp, mounting base, detent mount, roving detent element along with the detent wedges in accordance with an embodiment of the invention.
Figure 13 illustrates the manner in which the roving stop device with an electrical actuator is employed in a ring spinning machine in accordance with an embodiment of the invention.
Figure 14 illustrates a flow diagram to engage/disengage the roving stop device in a ring spinning machine in accordance with an embodiment of the invention.

DESCRIPTION OF THE INVENTION
[011] The present invention provides a roving stop device and method of using the roving stop device to reduce manual intervention and ensure no loss in production of the yarn.
[012] A roving stop device is described herewith. The roving stop device is employed on a ring spinning machine comprising a set of rollers containing rear drafting rollers, middle drafting rollers and front drafting rollers. Each of these rear drafting rollers, middle drafting and front drafting rollers comprise of an upper drafting roller and a lower drafting roller.
[013] Figure 1 of the drawings illustrates a roving stop device. The roving stop device consists of a pair of clamps (C) placed at either ends of the roving stop device to mount on a drafting frame of the ring spinning machine, an electrical sensor to detect the motion of the ring traveller in ring frame machine for continuous filaments of roving yarn (RY), an activating/deactivating (AE/DE) element to trigger the roving stop device, and a roving detent element (RDE). In one embodiment, the pair of clamps (C) are of glass material, with a composition of glass at 6%-15%. In one embodiment, the mounting clamp and the mounting base of clamps (C) are made up of a glass material having total glass filling from 6%-15% of their total material. Typically, the roving stop device is placed between the rear drafting rollers (RDR) and middle drafting rollers (MDR). The roving detent element (RDE) consists of pair of roving detent wedge1 and roving detent wedge2 wherein the roving detent wedge1 is placed between the rear upper drafting roller and rear down drafting roller. The roving detent wedge2 is placed between middle upper drafting roller and middle down drafting roller. In one embodiment, the Roving Detent Element (RDE) is of Polycarbonate material along with a mount which supports the roving detent element. When an electric sensor of the spindle monitoring system device detects the breakage of continuous yarn from the spindle of the roving yarn (T) and sends a roving stop signal to the ring spinning machine, the roving stop device activates the activating/deactivating element (AE/DE) to trigger the roving detent element (RDE).The roving detent element will move forward in between the rear upper drafting roller and the middle upper drafting roller to disengage these rollers with apron from the drafting steel roller, such that the breakage of the roving yarn stops up to the front roller in order to ease of piecing operation. In the present system, the rear roller only disengage from the drafting steel shaft and the breakage yarn does not maintain up to the front roller and it stopped between the rear and middle rollers. So, there is no roving yarn in the front roller and the piecing process gets more time consumed. In a preferred embodiment, the roving detent element activates the roving detent wedge1 and roving detent wedge2 such that the rear upper drafting roller and the middle upper drafting rollers are disengaged from the drafting steel rollers.
[014] The roving detent element ensures the space/gap between the rear rollers (RDR) and the middle rollers (MDR) from the drafting steel rollers are increased, such that the roving yarn (RY) will discontinue between the front rollers and pneumatic tube which was fixed in the pneumafil duct (not shown) and the roving yarn tends to stop in the front roller and pneumatic tube which was fixed in the pneumafil duct and stop in the front roller. Once the yarn moves downwards towards the rear roller and middle roller that are connected by an apron, ensures that the yarn can be directed towards the front rollers. Once the signal is received as to the completion of piecing operation, the wedges of the roving detent element (RDE) are deactivated using the activating/deactivating element (AE/DE) such that the roving detent element returns to its original position. On its return to the original position, the roving detent element (RDE) ensures contact between the rear roller (RDR) and drafting steel rollers and the middle (MDR) and the drafting steel rollers (MDR), such that the roving yarn continues to rove from middle drafting rollers (MDR) and front drafting rollers (FDR) automatically. The roving yarn (RY) is automatically guided towards the front drafting rollers thereby ensuring the roving of yarn without any delay or avoiding manual intervention. The activation /deactivation of the roving detent element can be performed using the following activating/deactivating elements (AE/DE) using a pneumatic cylinder or using a geared motor or using an electrical actuator. The roving detent element (RDE) is made of polyurethane material/Polycarbonate/PVC/Polyamide/ABS/Polyacetal or any equivalents. The control of the roving stop device can be made using a control circuitry controlling any/all the elements of the roving stop device. Each of these embodiments using the above activating/deactivating elements are explained below.
Embodiment 1
[015] In a preferred embodiment, a roving stop device using a pneumatic cylinder as an activating/deactivating element is described below. Figures 2 and 3, show a roving stop device using a pneumatic cylinder as an activating/deactivating element.
[016] The roving stop device as shown in Figure 2 has a pair of clamps (1,2) placed at either ends of the roving stop device to mount onto a drafting frame (13) of the ring spinning machine, one or more electrical sensors (not shown) to detect the motion of the traveller in ring frame machine for continuous filaments of roving yarn, a pneumatic cylinder (12) to trigger the roving stop device, and a roving detent element (3). In one embodiment, the pair of clamps (1,2) are partially made of a Polyacetal / Polyamide 6 with glass material having 15%-30% of glass. In one embodiment, the roving detent element (3) is made of Polycarbonate material that provides long term fatigue endurance and dimensional stability. The roving detent element (3) has roving detent- wedge1(8) of the roving detent element (3) placed between rear upper drafting rollers (4) and rear down drafting roller (5) and the roving detent-wedge2 (9) of roving detent element (3) placed between middle upper drafting rollers (6) and middle down drafting roller (7).The manner in which the roving stop device works is explained with respect to Figure 3.
[017] Figure 3 illustrates the manner in which the roving stop device is employed in a ring spinning machine. The roving stop device uses one or more electrical sensors monitoring the motion of a traveller in ring frame machine for continuous filaments. These sensors detect breakage through electronica control board of these continuous filaments and send a roving stop signal to solenoid which actuates the pneumatic cylinder (12).The roving detent element (3) is activated and moves forward, and it disengages the rear top drafting roller (4) and middle top drafting roller (6) at the same time, so the breaking of roving stops at front roller and it does not move to the pneumatic suction tube. The roving yarn stops between the middle drafting rollers (6), (7) and the front drafting rollers (10), (11). On activating the roving detent element (3), the gap between rear drafting rollers (4), (5) and middle drafting rollers (6), (7) is increased from the drafting steel rollers so the roving yarn will continue between these rollers. The middle down drafting roller (7) is connected by an apron (not shown) and a minimal gap between middle roller and drafting steel roller is present. The broken roving yarn moves downward from the middle upper drafting roller (6) towards the middle down drafting roller (7), which is then pulled into the apron between the middle down drafting roller (7) and front bottom drafting roller (11).
[018] When the solenoid/PCB/communication module receives the signal from piecing machine/ or when the manual piecing or manual switching is complete, the pneumatic cylinder (12) deactivates and proceeds for reverse stroke, so the wedges of roving detent element (3) is released, and the roving detent element (3) regains to its original position. The roving detent element (3) makes contact between rear drafting rollers (4), (5) and middle drafting rollers (6), (7), such that the roving yarn filament continues to rove from middle drafting rollers (6), (7) and front drafting rollers (10)(11) automatically and the spinning of yarn process is running to spindle.
[019] Another implementation of the roving stop device using a geared motor as an activating/deactivating device is described with respect to Embodiment 2 below.
Embodiment 2
[020] In a preferred embodiment, a roving stop device using a geared motor as an activating/deactivating element is described below. Figures 4, 5, 6, and 7, show a roving stop device using a geared motor as an activating/deactivating element.
[021] The roving stop device as shown in Figure 4 has a pair of clamps placed at either ends of the roving stop device (15,16) to mount onto a drafting frame (14) of the ring spinning machine, one or more electrical sensors (not shown) to detect the motion of the traveller in ring frame machine for continuous filaments of roving yarn. In one embodiment, the pair of clamps (1,2) are partially made of a Polyacetal/Polyamide 6 with glass material having 15%-30% of glass. In one embodiment, the roving detent element (3) is made of Polycarbonate in material that provides long term fatigue endurance and dimensional stability. The roving detent element (17) has roving detent wedge1(18) of the roving detent element (17) and the roving detent wedge2 (19).
[022] The activating/deactivating element is partially shown in the figure which is further described with respect to Figure 5 below.
[023] Figure 5 illustrates another view of Embodiment 2. The activate/deactivate element of Embodiment 2 has a geared motor (24) attached to a connecting thread rod (23). The outer diameter of the connecting thread rod (23) is threaded in inner diameter that will suit gear motor (24) shaft. The threaded outer diameter of connecting thread rod (23) is connected to a guide connecting plate (20) and both sides of guide connecting plate (20) is arrested by a side lock plate (22). The guide connecting plate (20) is connected to a guide plate (21).
[024] Figure 6 illustrates the manner in which the geared motor (24), the connecting rod (23) and the guide connecting plate are connected, and the manner in which the roving detent- wedge1(18) of the roving detent element (17) and the roving detent-wedge2 (19) of the roving detent element (17) are activated. The shaft of the gear motor (24) is attached to the connecting thread rod (23).In construction of the connecting thread rod (23), the outer diameter is threaded in such a manner that the inner diameter of the connecting thread rod (23) will the suit gear motor (24) shaft and the gear motor (24) shaft is locked onto the connecting thread rod (23).The threaded outer diameter of connecting thread rod (23) is connected to guide connecting plate(20) and both sides of the guide connecting plate(20) is arrested by side lock plate(22).When the gear motor (24) shaft rotates in a clockwise direction, the attached connecting thread rod (23) also rotates which makes the guide connecting plate (20) and the guide plate (21) moves forward. Once the guide plate (21) moves forward, the roving detent- wedge1(18) of the roving detent element (17) and the roving detent-wedge2 (19) of the roving detent element (17) are activated.
[025] Figure 7 illustrates the manner in which the roving stop device with a geared motor is employed in a ring spinning machine. The roving stop device is mounted onto the drafting frame (14) via the mounting clamps (15,16) placed at either ends of the roving stop device. The ring spinning machine has a set of rear drafting rollers (25,26), middle drafting rollers (27,28) and front drafting rollers (29,30).The roving detent element (17) is connected in-between the rear drafting rollers (25), (26) and the middle drafting rollers (27), (28).The roving detent- wedge1(18) of roving detent element (17) will be between rear upper drafting rollers (25) and rear down drafting steel roller (26).The roving detent-wedge2 (19) of roving detent element (17) will be between middle upper drafting rollers (27) and middle down drafting steel roller (28).The roving stop device uses one or more electrical sensors monitoring the motion of a ring traveller in ring frame machine for continuous filaments. These sensors detect breakage of these continuous filaments and send a roving stop signal to gear motor (24) and the gear motor rotates in clockwise direction. When the gear motor (24) shaft rotates in clockwise direction, the attached connecting thread rod (23) also rotates which makes the guide connecting plate (20) to move forward. The roving detent element (17) attached to the guide connecting plate (20) also moves forward, and it disengages the rear top drafting roller (25) and middle top drafting roller (27) at the same time, so the breaking of roving stops at front roller, and it does not move to the pneumafil suction tube. On activating the roving detent element (17), the gap between rear drafting rollers (25), (26) and middle drafting rollers (27), (28) is increased so the roving yarn will discontinue between these rollers. The middle down drafting roller (28) and the front drafting rollers (29,30) are connected by apron and only very minimal gap is present between these rollers. The broken roving yarn moves downward from the middle upper drafting roller (27) towards the middle down drafting roller (28), which is then pulled into the apron between the middle down drafting roller (28) and front bottom drafting roller (30).When the gear motor receives the signal from piecing machine/ or when the manual piecing or manual switching is complete, the gear motor (24) rotates in anti-clockwise direction, so the wedges (18, 19) of roving detent element (17) is released, and the roving detent element (17) regains to its original position. The roving detent element (17) makes contact between rear drafting rollers (25), (26) and middle drafting rollers (27), (28), such that the roving yarn filament continues to rove from middle drafting rollers (27), (28) and front drafting rollers (29), (30) automatically.
[026] Another implementation of the roving stop device using an electrical actuator as an activating/deactivating device is described with respect to Embodiment 3 below.
Embodiment 3
[027] In a preferred embodiment, a roving stop device using an electrical actuator as an activating/deactivating element is described below. Figures 8, 9, 10, and 11, show a roving stop device using an electrical actuator as an activating/deactivating element.
[028] The roving stop device as shown in Figure 8 has a pair of clamps (30,31) placed at either ends of the roving stop device to mount onto a drafting frame (38) of the ring spinning machine, one or more electrical sensors (not shown) to detect the motion of the traveller in ring frame machine for continuous filaments of roving yarn. The roving detent element (32) has roving detent- wedge1(33) of the roving detent element (17) and the roving detent-wedge2 (19). The activating/deactivating element (AE/DE) is partially shown in the figure which is further described with respect to Figure 9 below.
[029] Figure 9 illustrates another view of Embodiment 3. The activate/deactivate element of Embodiment 3 has an electrical actuator (35) attached to a connecting shaft (36) and the guide plate (37).
[030] Figure 10 illustrates the manner in which the electrical actuator (35), the connecting shaft (36) and the guide plate (37) are connected, and the manner in which the roving detent- wedge1(33) of the roving detent element (32) and the roving detent-wedge2 (34) of the roving detent element (34) are activated.
[031] Figure 11 illustrate the manner in which the roving stop device with an electrical actuator is employed in a ring spinning machine. The roving stop device is mounted onto the drafting frame (38) via the mounting clamps (30,31) placed at either ends of the roving stop device. The ring spinning machine has a set of rear drafting rollers (39,40), middle drafting rollers (41,42) and front drafting rollers (43,44).The roving detent element (32) is connected in-between the rear drafting rollers (39), (40) and the middle drafting rollers (41), (42).The roving detent- wedge1(33) of roving detent element (32) will be between rear upper drafting rollers (39) and rear down drafting roller (40).The roving detent-wedge2 (34) of roving detent element (32) will be between middle upper drafting rollers (41) and middle down drafting roller (42). In one embodiment, the pair of clamps (30,31) are partially made of Polyacetal / Polyamide 6 with glass material 15%-30% of glass. In one embodiment, the roving detent element (32) is made of Polycarbonate material that provides long term fatigue endurance and dimensional stability. The roving stop device (32) uses one or more electrical sensors monitoring the motion of a traveller in ring frame machine for continuous filaments. These sensors detect breakage of these continuous filaments and send a roving stop signal to electrical actuator (35). The electrical actuator (35) moves forward, that moves the connecting shaft (36) that makes the guide plate (37) to moves forward. The roving detent element (32) is attached to guide plate (37) also moves forward, and it stops rear top drafting roller (39) and middle top drafting roller (41) at the same time, so the breaking of roving stops at front roller and it does not moves to the pneumafil suction tube On activating the roving detent element (32), the gap between rear drafting rollers (39), (40) and middle drafting rollers (41), (42) is increased so the roving yarn will discontinue between these rollers. The middle down drafting roller (42) and the front drafting rollers (43,44) are connected by apron and only very minimal gap is present between these rollers. The broken roving yarn moves downward from the middle upper drafting roller (41) towards the middle down drafting roller (42), which is then pulled into the apron between the middle down drafting roller (42) and front bottom drafting roller (43).When electrical actuator (35) receives the signal from piecing machine/ or when the manual piecing or manual switching is complete, the electrical actuator (35) goes for a reverse stroke, so the wedges (33,34) of roving detent element (32) is released, and the roving detent element (32) regains to its original position. The roving detent element (32) makes contact between rear drafting rollers (39), (40) and middle drafting rollers (41), (42), such that the roving yarn filament continues to rove from middle drafting rollers (41), (42) and front drafting rollers (43), (44) automatically.
[032] Another implementation of the roving stop device using an electrical actuator as an activating/deactivating device is described with respect to Embodiment 4 below.
Embodiment 4
[033] In a preferred embodiment, a roving stop device using an electrical actuator as an activating/deactivating element is described below. Figures 12A-12D along with Figure 13, show a roving stop device using an electrical actuator as an activating/deactivating element. The constructional features of the Embodiment 4 are different from that of the Embodiment 3.
[034] The roving stop device as shown in Figure 12A has a mounting clamp (45) and a mount base (46). In one embodiment, the mounting clamp (45) and the mount base (46) is made of Polyacetal/Polyamide with glass filed material wherein the amount of glass present in the claim and the mount base is between 15%-30%. An electrical actuator (47) is mounted onto the mount base and is connected to the roving detent element (49). In one embodiment, the roving detent element (49) is made of Polycarbonate material that provides long term fatigue endurance and dimensional stability. The electrical actuator (47) is connected to a detent mount (48). The detent mount (48) is connected to the roving detent element (49). The roving detent element (49) has roving detent wedge1 (50) and roving detent wedge2 (51). In one embodiment, the roving detent device (49) and the detent mount (48) are made of Polycarbonate material that provides long term fatigue endurance and dimensional stability. The roving detent device also has a manual switch (52) for manually piecing the broken yarn.
[035] Figures 12B-12E illustrate an exploded view of the components of the roving stop device.
[036] Figures 12B and 12C illustrate the mounting clamp (45) and mount base (46) of the roving detent device of embodiment 4. The mounting clamp (45) along with the mount base (46) enables mounting onto the drafting frame (not shown). In one embodiment, the mounting clamp (45) and the mounting base (46) are made of glass filled materials/composites. In one embodiment, the mounting clamp (45) and the mounting base (46) comprises of 15%-30% of glass material.
[037] Figure 12D illustrates the roving detent element (49) along with the roving detent wedge1 and roving detent wedge2 shown in deactivated form. In one embodiment, the roving detent element (49) is constructed using Polycarbonate material that provides long term fatigue endurance and dimensional stability. In one embodiment, the roving detent wedges1 and 2, are made of Polyacetal/ polyurethane/Polyamide/PVC/Polycarbamate/ABS or any equivalents.
[038] Figure 12E illustrates the detent mount (48) in different views. The detent mount (48) supports the roving detent element (49) and enables the activation/deactivation of the roving detent element (49) by transmitting the movement from the electrical actuator (47) to the roving detent element (49). In one embodiment, the detent mount (48) is constructed using Polyamide 6 with glass filled material that provides long term fatigue endurance and dimensional stability.
[039] Figure 13 illustrate the manner in which the roving stop device (49) with an electrical actuator (47) is employed in a ring spinning machine. The roving stopper assembly is mounted to a drafting frame (59) by using a mounting clamp (45) and the mount base (46) together. The roving detent element (49) is positioned between rear drafting rollers (53), (54) and middle drafting rollers (55), (56). The roving detent-wedge1 (50) of roving detent element (49) will be between rear upper drafting rollers (53) and rear down drafting roller (54). The roving detent-wedge2 (51) of roving detent element (49) will be between middle upper drafting rollers (55) and middle down drafting roller (56) on activation. One or more electrical sensors monitor the motion of the traveller in ring frame machine for continuous filaments. These sensors detect breakage of these continuous filaments and send a roving stop signal to electrical actuator (49). The shaft of the electrical actuator (47) is attached to the detent mount (48). The roving detent element (49) is fixed to detent mount (48).When the electrical actuator (47) the roving detent element (49) moves forward, and it stops rear top drafting roller (53) and middle top drafting roller (55) at the same time, such that the breaking of roving yarn will not happen between rear drafting rollers (53), (54) and middle drafting rollers (55), (56). Breakage of roving happens between middle drafting rollers (55), (56) and front drafting rollers (57), (58). By enabling the roving detent wedges1 and 2, the gap between rear drafting rollers (53), (54) and middle drafting rollers (55), (56) is large and the roving yarn discontinues between these rollers, and it tends to move downward. Since the breakage of roving yarn happens between middle drafting rollers (55), (56) and front drafting rollers (57), (58), a minimal gap is only present between these set of rollers. The middle down drafting roller (56) is connected by an apron to the front drafting rollers (57), (58) only very minimal gap is present between these rollers. When the electrical actuator (47) receives signal from piecing machine or manual switching, the electrical actuator (47) actuates and proceeds for reverse stroke, so the wedges 1 and 2 of roving detent element (49) will be released and regains to its original position. On regaining original position, the roving detent element (49) makes the contact between rear drafting rollers (53), (54) and middle drafting rollers (55), (56) and the broken roving yarn filament continues to rove from middle drafting rollers (55), (56) and front drafting rollers (57)(58), automatically in minimum time. Accordingly, manual intervention is reduced, and productivity is improved.
[040] The manner in which the method of using a roving stop device in a ring spinning machine is explained using the flow diagram of Figure 14.
[041] Figure 14 illustrates a flow diagram to engage/disengage the roving stop device in a ring spinning machine. At step 1410, a yarn is received for performing ring spinning operation. At step 1420, a breakage in the yarn is detected using one or more sensors present in the ring spinning machine, by identifying a motion of a ring traveller in the ring spinning machine. At step 1430, the roving detent element is activated to move between a set of rear drafting rollers (RDR) and a set of middle drafting rollers (MDR) to disengage the rear drafting rollers and middle drafting rollers, such that breakage of the filaments does not happen between the rear drafting rollers and middle drafting rollers. The breakage of roving yarn happens between middle drafting rollers and front drafting rollers and a minimal gap is only present between these set of rollers. At step 1440, the roving detent element is deactivated and the contact between the rear drafting rollers (RDR) and the middle drafting rollers (MDR) is enabled. The roving detent element is placed on its position and the roving operation will continue from the middle draft roller through an apron connected in the middle draft roller moves roving yarn automatically to front draft roller, thereby reducing manual intervention with the process of production of yarn. In one embodiment, by activating the roving detent element a space is created between the rear drafting rollers and middle drafting rollers that the yarn on movement discontinues between the rear drafting rollers and middle drafting rollers.

ADVANTAGES
[042] Each of the embodiments described above, ensure that the breakage of the filaments does not happen between the rear drafting rollers and middle drafting rollers. On resumption of the roving detent element to its position, the roving operation will continue from the middle draft roller and the apron connected in the middle draft roller moves roving yarn automatically to front draft roller, thereby reducing manual intervention with the process of production of yarn. The production of yarn is also increased as the manual piecing operation is minimized, and wastage of yarn is also reduced.
[043] 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. A roving stop device for a ring spinning machine, comprising:
a pair of clamps (C) for mounting onto a drafting frame of the ring spinning machine, wherein the pair of clamps are placed at either end of the roving stop device;
an electrical sensor to detect a motion of a ring traveller in the ring spinning machine for identifying continuous filaments of roving yarn (RY);
a roving detent element (RDE) placed between a set of rear drafting rollers (RDR) and a set of middle drafting rollers (MDR) of the ring spinning machine;
an activating/deactivating element (AE/DE) configured to activate the roving detent element (RDE) on detection of breakage of roving yarn, wherein the roving detent element (RDE) moves between the set of rear drafting rollers (RDR) and the set of middle drafting rollers (MDR) to disengage the rear drafting rollers (RDR) and the middle drafting rollers (MDR) such that the roving yarn (RN) discontinues between the rear drafting rollers (RDR) and middle drafting rollers (MDR).

2. The roving stop device as claimed in claim 1, wherein the roving detent element (RDE) comprises a plurality of roving detent wedges, wherein a first roving detent wedge is placed between a rear upper drafting roller and a rear down drafting roller of the set of rear drafting rollers (RDR), and a second roving detent wedge is placed between a middle upper drafting roller and a middle down drafting roller of the set of middle drafting rollers (MDR).

3. The roving stop device as claimed in claim 2, wherein the roving detent element (RDE) ensures that the space between the rear drafting rollers (RDR) and middle drafting rollers (MDR) are increased, that the roving yarn (RN) on movement discontinues between the rear drafting rollers (RDR) and middle drafting rollers (MDR).

4. The roving stop device as claimed in claim 1, wherein the discontinued roving yarn (RN) between the rear drafting rollers and the middle drafting rollers is directed towards an apron that directs the roving yarn towards a set of front drafting rollers (FDR) of the ring spinning machine.

5. The roving stop device as claimed in claim 1 and 4, wherein on deactivation of the roving detent element (RDE), the contact between the rear drafting rollers (RDR) and the middle drafting rollers (MDR) is enabled, such that the roving yarn continues to rove via an apron towards a set of front drafting rollers (FDR) automatically from the middle drafting rollers (MDR).

6. The roving stop device as claimed in claim 1, wherein the material of the roving detent element is chosen from: polyurethane, polypropylene, Polyamide, Polycarbonate, Polyacetal and polystyrene.

7. A roving stop device, comprising:
a pair of clamps (1,2) for mounting onto a drafting frame (13) of a ring spinning machine, wherein the pair of clamps are placed at either end of the roving stop device;
an electrical sensor to detect a motion of a ring traveller in the ring spinning machine for continuous filaments of roving yarn (RY);
a roving detent element (3) placed between a set of rear drafting rollers (4,5) and a set of middle drafting rollers (6,7);
a pneumatic cylinder (12) configured to activate the roving detent element (3) on detection of breakage of a roving yarn, wherein the roving detent element (3) moves between the set of rear drafting rollers (4,5) and the set of the middle drafting rollers (6,7) to disengage the rear drafting rollers (4,5) and the middle drafting rollers (6,7), and the roving yarn (RN) discontinues between the rear drafting rollers (4,5) and middle drafting rollers (6,7).

8. The roving stop device as claimed in claim 7, wherein the pneumatic cylinder (12) activates the roving detent element (3) to ensure that the space between the rear drafting rollers (4,5) and middle drafting rollers (6,7) are increased, that the roving yarn (RN) discontinues between the rear drafting rollers (4,5) and middle drafting rollers (6,7).

9. The roving stop device as claimed in claim 7, comprises a plurality of roving detent wedges (8,9), wherein a first roving detent wedge (8) is placed between a rear upper drafting roller (4) and a rear down drafting roller (5), and a second roving detent wedge (9) is placed between a middle upper drafting roller (6) and a middle down drafting roller (7) of the middle drafting rollers.

10. The roving stop device as claimed in claim 7, wherein the pneumatic cylinder (12) on deactivation, disables the first roving detent wedge (8) and the second roving detent wedge (9) and enables the broken yarn to move towards a plurality of front drafting rollers (10,11) of the ring spinning machine.

11. The roving stop device as claimed in claim 7, wherein the broken roving yarn between the rear drafting rollers (4,5) and the middle drafting rollers (6,7) is directed towards an apron that directs the roving yarn towards a plurality of front drafting rollers (10,11) of the ring spinning machine.

12. The roving stop device as claimed in claim 11, wherein on deactivation of the roving detent element (3), the contact between the rear drafting rollers (4,5) and the middle drafting rollers (6,7) is enabled, such that the broken roving yarn continues to rove via the apron towards the front drafting rollers (4,5) automatically from the middle drafting rollers (6,7).

13. A roving stop device (17), comprising:
a pair of clamps (15,16) for mounting onto a drafting frame of a ring spinning machine wherein the pair of clamps are placed at either end of the roving stop device;
an electrical sensor to detect the motion of a ring traveller in a ring spinning machine for identifying continuous filaments of roving yarn (RY);
a roving detent element (17) placed between a set of rear drafting rollers (25,26) and a set of middle drafting rollers (27,28);
a geared motor (24) configured to rotate in clockwise direction to activate the roving detent element (17) on detection of breakage of roving yarn, wherein the roving detent element (17) moves between the set of rear drafting rollers (25,26) and the set of middle drafting rollers (27,28) to disengage the rear drafting rollers (25,26) and the middle drafting roller (27,28) such that the roving yarn discontinues between the rear drafting rollers (25,26) and middle drafting rollers (27,28).

14. The roving detent device as claimed in claim 13, wherein a shaft of the geared motor (24) is connected to a connecting thread rod (23), the connecting thread rod (23) is connected to a guide connecting plate (20) and the guide connecting plate (20) is connected to a guide plate (21), wherein when the geared motor (24) rotates in a clockwise direction, the connecting thread rod (23) moves in a clockwise direction and the guide connecting plate (20) and the guide plate (21) moves forward, activating the roving detent element.

15. The roving detent device as claimed in claim 13, wherein the roving detent element (17) comprises:
a plurality of roving detent wedges (18,19),
wherein a first roving detent wedge (18) is placed between a rear upper drafting roller (25) and a rear down drafting roller (26) of the set of rear drafting rollers, and
a second roving detent wedge (18) is placed between a middle upper drafting roller (27) and a middle down drafting roller (28) of the set of middle drafting rollers.

16. The roving detent device as claimed in claim 13, wherein the geared motor (24) rotating in anti-clockwise direction, disables the first roving detent wedge (18) and the second roving detent wedge (19) and enables the broken yarn to move towards a plurality of front drafting rollers (29,30) of the ring spinning machine.

17. The roving stop device as claimed in claim 13, wherein the broken roving yarn between the rear drafting rollers (25,26) and the middle drafting rollers (27,28) is directed towards an apron that directs the roving yarn towards a set of front drafting rollers (29,30) of the ring spinning machine.

18. The roving stop device as claimed in claim 17, wherein on deactivation of the roving detent element, the contact between the rear drafting rollers (25,26) and the middle drafting rollers (27,28) is enabled, such that the broken roving yarn continues to rove via the apron towards the front drafting rollers (29,30) automatically from the middle drafting rollers (27,28).

19. A roving stop device, comprising:
a pair of clamps (30,31) for mounting onto a drafting frame (38) of a ring spinning machine wherein the pair of clamps are placed at either end of the roving stop device;
an electrical sensor to detect the motion of a ring traveller in a ring spinning machine for identifying continuous filaments of roving yarn;
a roving detent element (32) placed between a set of rear drafting rollers (39,40) and a set of middle drafting rollers (41,42) of the ring spinning machine;
an electrical actuator (35) on forward stroke activates the roving detent element (32) on detection of breakage of roving yarn, wherein the roving detent element (32) moves between the set of rear drafting rollers (39,40) and the set of middle drafting rollers (41,42) to disengage the rear drafting rollers (39,40) and the middle drafting rollers (41,42) such that the roving yarn (RN) discontinues between the rear drafting rollers (39,40) and middle drafting rollers (41,42).

20. The roving detent device as claimed in claim 19, wherein the electrical actuator is connected to the roving detent element through a connecting shaft (35) and a guide plate (37), wherein on actuation, the electrical actuator moves forward, moving the connecting shaft and the guide plate to move the roving detent element between the rear drafting rollers (39,40) and the middle drafting rollers (41,42) to disengage the rear drafting rollers (39,40) and the middle drafting rollers (41,42).

21. The roving detent device as claimed in claim 19, wherein the roving detent element comprises a plurality of roving detent wedges (33,34), wherein a first roving detent wedge (33) is placed between a rear upper drafting roller (39) and a rear down drafting roller (40) of the set of rear drafting rollers, and a second roving detent wedge (34) is placed between a middle upper drafting roller (41) and a middle down drafting roller (42) of the middle drafting rollers.

22. The roving detent device as claimed in claim 19, wherein the electrical actuator (24) on reverse stroke, disables the first roving detent wedge (33) and the second roving detent wedge (34) and enables the broken yarn to move towards a set of front drafting rollers (43,44) of the ring spinning machine.

23. The roving stop device as claimed in claim 19, wherein the broken roving yarn between the rear drafting rollers (39,40) and the middle drafting rollers (41,42) is directed towards an apron that directs the roving yarn towards the front drafting rollers (43,44).

24. The roving stop device as claimed in claim 19, wherein on deactivation of the roving detent element, the contact between the rear drafting rollers (39,40) and the middle drafting rollers (41,42) is enabled, such that the broken yarn continues to rove via the apron towards the front drafting rollers (43,44) automatically from the middle drafting rollers (41,42).

25. A method of using a roving stop device in a ring spinning machine, the method comprising:
receiving (1410) a yarn for performing ring spinning operation;
detecting (1420) a breakage in the yarn, by identifying a motion of a ring traveller in a ring spinning machine;
activating (1430) a roving detent element, to move between a set of rear drafting rollers (RDR) and a set of middle drafting rollers (MDR) to disengage the rear drafting rollers (RDR) and the middle drafting rollers (MDR) such that the yarn discontinues between the rear drafting rollers and middle drafting rollers;
deactivating (1440) the roving detent element and enabling the contact between the rear drafting rollers (RDR) and the middle drafting rollers (MDR), such that the yarn continues to rove towards the front drafting rollers (FDR) automatically from the middle drafting rollers (MDR).

26. The method as claimed in claim 25, wherein activating the roving detent element, to move between a set of rear drafting rollers (RDR) and a set of middle drafting rollers (MDR) ensures that a space is created between the rear drafting rollers and middle drafting rollers that the yarn on movement discontinues between the rear drafting rollers (RDR) and middle drafting rollers (MDR).

27. The method as claimed in claim 25, wherein the discontinued yarn is directed towards an apron to guide the discontinued yarn towards a set of front drafting rollers.

Dated this 31st day of July 2023
Lakshmi Precision Technologies Limited
By their Agent & Attorney

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