Roving stop assembly for a drafting frame of a ring spinning machine and ring spinning machine

Abstract

A roving stop assembly (1) for a drafting frame (3) of a ring spinning machine, comprising at least one roving stop element (4) arranged to be able to act on one of a pair of back drafting rollers (3a) or a pair of intermediate drafting rollers (3b) in an active position; a triggering device (5, 9) operatively connected to at least the roving stop element (4) to trigger the driving of at least the roving stop element (4) to the active position; and a resetting device (6) for resetting at least the roving stop element (4) to an inactive position by means of a resetting mechanism, thereby restoring the supply of roving. The roving stop assembly is characterized in that the resetting device comprises a resetting actuator arm (10) arranged at a front portion (F) of the drafting frame (3).

Description

Technical Field

[0001] This invention generally relates to a roving stop assembly for interrupting the supply of roving when yarn is being manufactured at a spinning station on a ring spinning machine. The invention also relates to a ring spinning machine comprising: a traction frame having a plurality of spinning stations; and a roving stop assembly located at each of these spinning stations. Background Technology

[0002] It is well known that at the spinning position of a ring spinning machine, the breakage of the yarn to be fed to the spindle assembly is monitored.

[0003] Known spinning systems use roving stop devices to promptly stop the supply of roving, thereby preventing roving loss due to yarn breakage while the spinning machine is running. These roving stop devices include roving stop elements configured to act on the rear traction roller upon detection of a signal from an electrical or electromagnetic sensor used to monitor yarn breakage through the spindle assembly, thereby preventing movement of the upper rear traction roller.

[0004] Document CN2844159Y discloses an existing spinning machine including one of the aforementioned known roving stopping devices, wherein the roving stop element is hinged to a sliding member, and the sliding member is easily released to an activated position by a triggering member upon yarn breakage. When the stop element is in the active position, the roving is clamped between a pair of rear traction rollers, thus causing a roving interruption upon roving breakage, thereby preventing roving supply.

[0005] It is also known that "core" yarns are manufactured using continuous spinning processes. This type of yarn combines one or two continuous filaments with elastic properties on a single yarn beam and is covered with fibers from cotton roving or similar rovings. For the manufacture of "core" yarns, continuous filaments of elastomeric materials (such as elastic fibers or spandex fibers), such as those marketed as [brand name missing], are typically used. This is a known situation. These continuous filaments are prone to breakage, and in the event of breakage, the supply of roving must be stopped immediately to prevent the production of defective yarn lacking the continuous filaments that form its core.

[0006] In the prior art, there are roving stopping devices for core spinning machines that promptly stop the supply of roving to prevent the production of defective yarn lacking continuous filaments. Many of these roving stopping devices employ electrical sensors that monitor the passage of a first and / or second continuous filament. These sensors detect the breakage of one of these continuous filaments and send a roving stop signal to an electromagnetic actuator associated with a triggering member to trigger at least one roving stop element to an active position, thereby stopping the roving supply upon the breakage of a continuous filament. The roving stop element in the active position acts on a pair of rear traction rollers, thereby clamping the roving between them.

[0007] The aforementioned roving stop device includes a reset device for resetting the roving stop element to its inactive position via a reset mechanism, so as to restore the roving supply before the operator begins to repair broken yarns or broken filaments.

[0008] However, when producing yarn on a ring spinning machine, the spindle spacing, or the distance between spindle positions, is so narrow that it is difficult for operators to perform processing operations aimed at resetting the roving stop element to its inactive position to restore the roving supply. This is especially true when producing "core" yarn, where the processing between spindle positions requires extreme care to prevent breakage of the very fine, continuous filaments fed to adjacent spindle assemblies.

[0009] Therefore, it is necessary to provide an alternative to the prior art that overcomes the shortcomings of the prior art by providing a roving stop assembly, and significantly improves the reliability of handling operations during yarn production on a ring spinning machine. Summary of the Invention

[0010] Therefore, in a first aspect, the present invention relates to a roving stopping assembly for interrupting the supply of roving during yarn production on a ring spinning machine, wherein the traction frame of the ring spinning machine includes a pair of front traction rollers, a pair of intermediate traction rollers, and a pair of rear traction rollers, and the roving stopping assembly includes:

[0011] - At least one roving stop element, which is arranged to act in a movable position on one of the pair of rear traction rollers or the pair of intermediate traction rollers to stop the supply of roving at the spinning station of the ring spinning machine.

[0012] - A triggering device, operatively connected to at least one roving stop element, to trigger the roving stop element to an active position, and,

[0013] - A reset device that resets at least the roving stop element to an inactive position via a reset mechanism, thereby restoring the roving supply.

[0014] Unlike known roving stop assemblies, the roving stop assembly proposed in the first aspect of the present invention is characterized in that the reset device includes a reset actuator arm disposed at the front of the traction frame. The reset actuator arm is mounted to cooperate with a reset mechanism operatively connected to at least one roving stop element, such that when the reset actuator arm located at the front of the traction frame is actuated, at least one roving stop element is allowed to be displaced to an inactive position, thereby restoring the roving supply.

[0015] The phrase "located at the front of the traction frame" should be understood as being located at the foremost position of the traction frame, preferably, located next to or near the front roller of the traction frame.

[0016] Benefiting from the claimed features, the present invention provides a roving stop assembly in which the reset operation of the roving stop element is made easier and more reliable by means of a reset actuator arm arranged at the front of the traction frame and cooperating with a reset mechanism.

[0017] In practice, the roving supply can be restored by simply actuating the reset actuator arm located at the front of the traction frame, using the roving stop assembly that is claimed to be protected. Therefore, the operator does not need to enter the interior of the traction frame to reset the roving stop element to its inactive position. This makes handling operations between spindle positions easier and more reliable.

[0018] Preferably, the roving stop assembly includes a drive device for automatically driving a reset actuator arm located at the front of the traction frame of the ring spinning machine to restore the roving supply before the operator or robotic arm is ready to begin repairing broken yarn or broken filament (e.g., to begin a splicing operation).

[0019] According to one embodiment, the drive unit includes a drive device arranged on an automated maintenance station, which is movable along a row of spinning stations and has the option to stop at a selected spinning station where a maintenance operation is required.

[0020] Preferably, thanks to these claimed features, the present invention provides a roving stop assembly that, in the event of yarn breakage and / or continuous filament breakage, eliminates the need for an operator to manually reset the roving stop element to restore the roving supply.

[0021] Advantageously, the drive unit may include, for example, a piston and cylinder assembly, or other equivalent drive components or devices, arranged, or not arranged, at the automated maintenance station to drive the reset actuator arm located at the front of the traction frame at the spinning station where maintenance operations are required.

[0022] Also advantageously, the drive unit includes a drive tool for driving the reset actuator arm, the drive tool being attachable to the robotic arm.

[0023] The robotic arm may have at least six degrees of freedom to allow the drive tool to be positioned at the front of the traction frame, thereby automatically driving (pushing or pulling) the reset actuator arm located at the front of the traction frame.

[0024] According to a preferred embodiment, the driving tool is, for example, a yarn handling tool of a yarn splicing system, preferably, the yarn handling tool is attachable to a robotic arm of the yarn splicing system that performs automatic splicing operations.

[0025] Advantageously, the drive tool or yarn handling tool is provided with a clamping element, such as a clamping element configured as a protrusion or projection, for driving or engaging a reset actuator arm located at the front of the traction frame.

[0026] Preferably, the triggering device of the roving stop assembly includes a triggering member that is mounted to cooperate with a reset mechanism to release the reset mechanism to an activated position after yarn breakage or continuous filament breakage, and to hold the reset mechanism to a non-activated position after driving the reset actuator arm.

[0027] Therefore, when the reset actuator arm is driven, the reset mechanism is displaced to obtain an inactive position, and the trigger member cooperates to hold the reset mechanism in this inactive position, wherein at least the roving stop element is in an inactive position, thereby allowing the roving supply to be restored.

[0028] According to a preferred embodiment, the reset mechanism includes a sliding member associated with the reset actuator arm, and the sliding member is mounted to be displaceable along the longitudinal direction, thereby allowing at least the roving stop element to be displaced to an inactive position when the reset actuator arm is driven.

[0029] In the preferred embodiment described above, the triggering member is installed to cooperate with the sliding member, such that:

[0030] - After the drive reset actuator arm is engaged, the sliding member is easily held in the non-activated position by the triggered member, and

[0031] - In the event of yarn breakage and / or continuous filament breakage, the sliding component is easily released to the excitation position by the trigger component.

[0032] Preferably, when the sliding member is reset and the actuator arm is displaced, potential energy can be accumulated until the triggered member remains in its unactivated position. In the event of yarn breakage and / or continuous filament breakage, when the triggered member releases the sliding member, the accumulated potential energy is readily transferred as motion to at least the roving stop element.

[0033] Advantageously, the sliding member can accumulate potential energy from the compressive force applied to the spring or to an equivalent or similar element to allow the sliding member to return to its position.

[0034] In one embodiment, the sliding member includes: a groove or recess that interacts with a triggering member; and a spring arranged to be compressed by shifting the sliding member to a non-excited position until the triggering member locks the sliding member.

[0035] Preferably, the reset actuator arm is configured such that it extends longitudinally to the front of the traction frame, for example, to a position next to the bottom front roller.

[0036] Preferably, the reset actuator arm is integrally attached to the sliding member such that when the reset actuator arm is driven (pulled or pushed), the sliding member is displaced in the longitudinal direction.

[0037] In one implementation, the reset actuator arm is configured to form an integral part with the sliding member, thereby extending longitudinally to the front of the traction frame.

[0038] However, according to an alternative embodiment, the reset actuator arm includes a separate piece removably attached to the sliding member, thereby extending longitudinally to the front of the traction frame.

[0039] The advantage of this alternative implementation is that it allows existing roving stop assemblies to be easily adapted or converted into the roving stop assembly for which protection is sought.

[0040] Preferably, the distal portion of the reset actuator arm includes or forms a channel adapted to allow at least one traction ring wound around the bottom intermediate traction roller to pass through and / or at least one suction tube adapted for sucking up broken fibers or broken filaments to pass through.

[0041] Preferably, the roving stopping assembly includes:

[0042] - A detection device arranged to detect the absence or change in the movement of the traveler along the loop of the spindle assembly when the yarn breaks, and / or a detection device used to detect the absence of the continuous filament at the spinning position when the continuous filament breaks during the production of the "core" yarn, and

[0043] - The processing and control device is configured to:

[0044] - Receive yarn breakage signals and / or filament breakage signals from the detection device.

[0045] - The yarn breakage signal and / or filament breakage signal are forwarded to the triggering device to trigger the drive of at least the roving stop element to the active position, thereby stopping the roving supply, and subsequently,

[0046] - Prior to the splicing operation, a roving reset signal is forwarded to the drive unit, which automatically drives the reset actuator arm located at the front of the traction frame of the ring spinning machine, so that at least the roving stop element is displaced to an inactive position, thereby restoring the roving supply.

[0047] In one embodiment, the roving stop assembly includes an automatic maintenance station containing a drive mechanism for resetting the actuator arm, and the processing and control device is further configured to:

[0048] - Forward maintenance signals to automated maintenance stations, which are repositioned along a row of spinning stations and have the option to stop at a selected spinning station where maintenance is required.

[0049] Additionally, if the drive tool is attached to the robotic arm, the handling and control devices are configured as follows:

[0050] - Provide a roving reset signal to the robotic arm to allow the robotic arm to position the drive tool at the reset actuator arm so that the drive tool can push or pull the reset actuator arm located at the front of the traction frame.

[0051] Advantageously, the detection device includes an optical sensor arranged close to the spindle assembly to detect the movement of the traveler and output a signal indicating the absence or change in the movement of the traveler when the yarn breaks.

[0052] As is known, once drawn, the roving or yarn is passed down to the spindle assembly, where it passes through a small loop called a traveler. The traveler moves along a loop arranged coaxially with the spindle. There, the yarn is attached to the existing yarn on the spindle. The traveler shares the same axis as the spindle but rotates at a different speed. The spindle is driven, and the traveler falls behind, thus distributing the rotation between the spindle's winding and the yarn's twisting. The aforementioned optical sensor continuously controls the state and RPM at each spinning position, and the data collected from the optical sensor is transmitted to monitoring software, which sends a roving stop signal to the processing and control unit of the roving stop assembly. The advantage of the optical sensor is that it provides ultra-fast detection and communication, as it allows for the detection of yarn breakage in less than a second, thereby immediately initiating a roving interruption.

[0053] Preferably, the triggering device includes an electromagnetic actuator for driving the triggering member, wherein the electromagnetic actuator is configured to be energized upon receiving a yarn breakage signal and / or a filament breakage signal.

[0054] Advantageously, the driving tool is a yarn handling tool attached to a robotic arm, wherein the yarn handling tool includes at least one clamping element configured to drive a reset actuator arm located at the front of the traction frame, and preferably also configured to secure an auxiliary yarn to the outside of the yarn feed nozzle.

[0055] A clamping element should be understood as an element used to hold or grip the yarn on the outside of the yarn feed nozzle. This clamping element may be configured to attach to a protrusion or projection of a yarn handling tool, for example, the clamping element may be configured or adapted to engage with a reset actuator arm, or to hold or grip a portion of the yarn on the outside of the yarn feed nozzle.

[0056] Thanks to these features, the same tool attached to the robotic arm can be used to automatically reset at least the roving stop element, thereby restoring the roving supply and performing threading and splicing operations.

[0057] Preferably, at least the roving stop element is configured in a wedge shape, such as a wedge with a curved surface, and is arranged to be inserted between a pair of rear traction rollers or a pair of intermediate traction rollers in its active position to stop the roving supply. Advantageously, at least the roving stop element is hinged to the sliding member. However, according to another embodiment, the roving stop element may be integrally attached to a different member of the reset mechanism associated with the reset actuator arm.

[0058] A second aspect of the invention relates to a ring spinning machine, comprising: a traction frame having a plurality of spinning stations; and a claimed roving stop assembly located at each of these spinning stations, wherein each of the roving stop assemblies comprises:

[0059] -At least the roving stop element

[0060] - A triggering device, operatively connected to the at least one roving stop element, and

[0061] - Reset actuator arm, which is arranged at the front of the traction frame at each spinning position.

[0062] - wherein the reset actuator arm is mounted to cooperate with a reset mechanism operatively connected to the at least roving stop element so that when the reset actuator arm located at the front of the traction frame is driven, the at least roving stop element is allowed to be displaced to an inactive position, thereby restoring the roving supply.

[0063] A third aspect of the invention relates to a method for monitoring the supply of roving at a spinning position on a ring spinning machine by means of the claimed roving stop assembly, wherein the assembly includes a drive device for driving the reset actuator arm, and the method includes the following steps:

[0064] a) Before starting the repair of broken yarns and / or broken continuous filaments, for example, before starting the splicing operation, a roving reset signal is forwarded to a drive unit for automatically driving the reset actuator arm located at the front of the traction frame of the ring spinning machine.

[0065] The broken yarn that must be repaired can be, for example, ordinary yarn or "core" yarn.

[0066] In this invention:

[0067] "Plain yarn" should be understood as yarn produced by pre-drawing and main drawing at least one roving using a single intermediate bottom traction loop wound around an intermediate bottom traction roller.

[0068] "Core yarn" should be understood as a yarn consisting of a core formed by one, two, or up to three continuous filaments combined with a bundle of roving fibers covering the filaments.

[0069] "Duo core" yarn should be understood as yarn consisting of a core formed by two continuous filaments combined with a bundle of roving fibers covering the filaments.

[0070] "Continuous filament" should be understood as textile fiber filaments of undefined length; preferably, the length of the synthetic fiber (e.g., filaments of elastic fiber or polyester fiber) is obtained by extrusion.

[0071] "Roving" or "roving fiber bundle" should be understood as a bundle of cut cotton, wool, or viscose fibers, or other similar natural or man-made fibers, intended or not intended to be used to cover one or more continuous filaments when spinning core yarn.

[0072] The threading operation should preferably be understood as the operation of creating or forming a threading segment of auxiliary yarn on the outside of the yarn feed nozzle, and processing the threading segment at the flange of the ring spindle of the ring spinning machine to thread the threading segment into the annular steel wire traveler of the ring spinning machine.

[0073] The splicing operation should be understood as the operation of positioning the yarn handling tool used for splicing threading auxiliary yarns on the roving, wherein the roving is fed by the front traction roller of the traction assembly of the ring spinning machine.

[0074] The phrase "located at the front of the traction frame" should be understood as being located at the very front of the traction frame, preferably next to or near the bottom front roller. Attached Figure Description

[0075] Referring to the accompanying drawings, the prior and other advantages and features will be more fully understood from the following detailed description of the embodiments, which should be considered in an illustrative and non-limiting manner, wherein the following is a summary:

[0076] Specifically:

[0077] Figure 1 A perspective view of one embodiment of the roving stop assembly is shown, illustrating a reset actuator arm of a sliding member attached to a reset mechanism operatively connected to the roving stop element.

[0078] Figure 2 yes Figure 1 A partial exploded perspective view of the roving stop assembly shows a reset actuator arm and a roving stop element. The reset actuator arm is configured as a separate piece removably attached to the sliding member, and the roving stop element is configured as a wedge and inserted between a pair of rear traction rollers or a pair of middle traction rollers suitable for conveying roving.

[0079] Figure 3 It is a schematic 3D diagram showing Figure 1 Two roving stop assemblies are mounted at two spinning stations on the traction frame of a ring spinning machine, wherein the bottom traction apron of each intermediate bottom traction roller passes through a channel provided on the distal portion of each reset actuator arm. This figure shows the roving stop element of the two roving stop assemblies, which, in the active position, acts on a pair of rear traction rollers to interrupt the roving supply. Upon yarn breakage, the sliding member of each reset mechanism is released to the rearward actuated position.

[0080] Figure 4 Is the same as the above Figure 3 A similar perspective schematic perspective, in this case showing two roving stop assemblies with roving stop elements in an inactive position to allow roving supply (not shown). The sliding member of each reset mechanism is driven by pulling the reset actuator arm until it is held in the forward, non-activated position.

[0081] Figure 5This is a schematic perspective view of the traction frame, showing multiple roving stop assemblies at each spinning position. Some roving stop assemblies have their roving stop elements in the active position, while others have them in the inactive position. The reset actuator arm of the roving stop assembly with the active roving stop element has a rearward actuated position, awaiting actuation to restore the roving supply. For clarity, the traction aprons of the upper traction roller and the intermediate bottom traction roller are not shown.

[0082] Figure 6 yes Figure 1 A schematic side view of the roving stop assembly, wherein, upon receiving a yarn breakage signal, the roving stop element acts in an active position on a pair of rear traction rollers to interrupt the roving supply. The sliding member of the reset mechanism and the reset actuator arm are both in a rearward actuated position. The figure shows a drive tool equipped with a clamping element in the form of a protrusion for engaging with the reset actuator arm at the front of the traction frame. In this embodiment, the drive tool is a yarn handling tool attached to a robotic arm of the yarn splicing system.

[0083] Figure 7 yes Figure 6 A schematic side view of the roving stop assembly shows a drive tool that pulls the reset actuator arm of the sliding member attached to the reset mechanism.

[0084] Figure 8 yes Figure 1 A schematic side view of the roving stop assembly, wherein both the sliding member and the reset actuator arm are held in the forward, non-activated position. In this position, the roving stop element is inactive to allow roving supply.

[0085] Figure 9 This is a schematic longitudinal section of the roving stop assembly, showing: a reset actuator arm attached to a sliding member of a reset mechanism operatively connected to the roving stop element; a trigger member mounted to cooperate with the reset mechanism; and an electromagnetic actuator for driving the trigger member. In the embodiment shown in this figure, the reset mechanism includes: a sliding member with a groove; and a spring arranged to be compressed by displacing the sliding member with the reset actuator arm until the trigger member locks the sliding member in the groove.

[0086] Figure 10 It is similar to Figure 9A schematic longitudinal section of the roving stop assembly. In this figure, when a breakage signal is received, the sliding member of the reset mechanism is released to the rearward excitation position by the trigger member when the electromagnetic actuator is energized. The breakage signal comes from a detection device for detecting a loss or change in the movement of the traveler along the loop of the spindle assembly when the yarn breaks, and / or from a detection device for detecting a loss of the continuous filament when the continuous filament breaks during the production of the "core" yarn.

[0087] Figure 11 This is a schematic side view of a ring spinning machine configured to produce "double-core" yarn with a roving stop assembly requiring protection. The figure shows the left and right traction frames, the left and right roving supports, and the left and right bobbins, which have spools arranged for "deroulée" unwinding two different continuous filaments. The first continuous filament can be, for example, an elastomer filament, such as those with the trademark [trademark name missing]. The elastic fiber, and the second continuous filament can be, for example, a trademark of INVISTA. The roving can be, for example, broken cotton fiber. As shown in the figure, a ring spinning machine includes each spinning position located on the traction frame. Figure 1 The roving stop assembly, wherein each assembly includes a reset actuator arm arranged at the front “F” of the traction frame. Detailed Implementation

[0088] The following is for reference. Figures 1 to 11 The description of the claimed invention, and the figures illustrate exemplary embodiments of the invention, applicable to ring spinning machines suitable for producing yarn.

[0089] For example, the present invention can be applied to Figure 11 The image shows a ring spinning machine suitable for producing "double-core" yarn. This ring spinning machine includes a row of spinning stations arranged adjacent to each other, and a left traction frame and a right traction frame 3 with a pair of front traction rollers 3c, a pair of intermediate traction rollers 3b, and a pair of rear traction rollers 3a. At each spinning station or each spinning position, multiple roving stop assemblies 1 are attached to rods 2 of each traction frame 3 of the ring spinning machine. Roving bobbins 16 are hung on the left and right roving supports 17, and the left and right bobbins 18 are equipped with bobbins 19 arranged to "unwind" two different continuous filaments.

[0090] Figure 5 It shows Figure 11 A schematic perspective view of a traction frame 3, showing multiple roving stop assemblies 1 attached to a rod 2. For clarity, the upper traction roller of the traction frame 3 is not shown in this figure; only the lower traction roller is shown.

[0091] Each of the claimed roving stop components 1 includes:

[0092] - At least one roving stop element 4, said roving stop element 4 being arranged to act in a movable position on a pair of rear or intermediate traction rollers 3a responsible for conveying the roving to be pulled.

[0093] - A triggering device, operatively connected to the roving stop element 4, to trigger and drive the roving stop element 4 to an active position upon yarn breakage or continuous filament breakage, and

[0094] - A reset device for resetting at least the roving stop element 4 to an inactive position via a reset mechanism, thereby restoring the roving supply so that the operator can begin repairing broken yarns or broken filaments.

[0095] In the illustrated embodiment, the triggering device includes a trigger member 5 mounted to cooperate with a reset mechanism, which includes a sliding member 6 easily held in a forward, non-activated position by the trigger member 5. Specifically, the sliding member 6 includes: a groove 7 for the trigger member 5; and a spring 8 arranged to be compressed by displacing the sliding member 6 until the trigger member 5 is locked in the groove 7 of the sliding member 6 (see [link to original document]). Figure 9 ).

[0096] exist Figure 9 In the forward, non-excited position, the sliding member 6 can accumulate potential energy, which originates from the compressive force applied to the spring 8. In the event of yarn breakage or continuous filament breakage, when the trigger member 5 releases the sliding member 6 to the rearward excited position, this accumulated potential energy is readily transferred as motion to at least the roving stop element 4 (see [link to roving stop element 4]). Figure 10 ).

[0097] In the illustrated embodiment, the triggering device includes an electromagnetic actuator 9, such as an electromagnetic coil and piston assembly for driving the triggering member 5. The electromagnetic actuator 9 is energized upon receiving a yarn and / or filament breakage signal in the event of yarn breakage and / or continuous filament breakage. The breakage signal may originate from a detection device, such as a sensor, for detecting a loss or change in the movement of the traveler along the loop of the spindle assembly 20 when the yarn breaks, or from a detection device, such as another sensor, for detecting the loss of a continuous filament when it breaks.

[0098] Unlike known roving stop assemblies, in the assembly proposed in this invention, the reset device includes a reset actuator arm 10, which is arranged at the front of the traction frame 3, or at the foremost position of the traction frame 3. Specifically, the reset actuator arm 10 is configured to extend longitudinally from the reset mechanism to the front of the traction frame 3.

[0099] In the illustrated embodiment, the reset actuator arm 10 includes a separate piece removably attached to the sliding member 6, the separate piece being configured to extend longitudinally to the front of the traction frame 3. This embodiment has the advantage of allowing existing roving stop assemblies to be easily converted into the claimed roving stop assembly.

[0100] As can be seen in the figure, the reset actuator arm 10 extends longitudinally to the front of the traction frame 3, wherein the distal portion of the reset actuator arm 10 forms a channel 11, which is adapted to allow the bottom traction ring 12 of the bottom intermediate traction roller 3b to pass through (see figure). Figure 3 and Figure 4 The same channel 11 also applies to the passage of straw 21 (see...). Figure 11 The suction tube 21 is used to draw out broken fibers or broken filaments.

[0101] Figure 3 A schematic diagram of a pair of roving stop assemblies installed at two spinning stations of the traction frame 3 is shown. In this diagram, when the yarn breaks, the roving stop element 4 of each roving stop assembly acts on a pair of rear traction rollers 3a in the active position, thereby interrupting the roving supply, wherein the corresponding sliding mechanism 6 of the reset mechanism is released to the rearward actuated position.

[0102] The reset actuator arm 10 is mounted to engage with the sliding member 6 of the reset mechanism. This sliding member 6 is operatively connected to the roving stop element 4 to allow the roving stop element 4 to be displaced to an inactive position under the drive of the reset actuator arm 10, thereby restoring the roving supply (see [link]). Figure 4 ).

[0103] As disclosed above, in the claimed roving stop device, the roving supply can be restored by simply actuating the reset actuator arm 10 located at the front of the traction frame 3. Therefore, the operator does not need to enter the interior of the traction frame 3 to reset the roving stop element 4, making the handling operation between spindle positions easier and more reliable.

[0104] for Figure 6 and Figure 7In the preferred embodiment shown, the roving stop assembly includes a drive mechanism for automatically actuating a reset actuator arm 10 located at the front of the traction frame 3, thereby restoring the roving supply. In this manner, the advantage of the roving stop assembly is that it eliminates the need for an operator to manually reset the roving stop element 4.

[0105] exist Figure 6 and Figure 7 In the illustrated embodiment, the drive unit includes a drive tool 13 attached to a robotic arm 14, which is arranged on an automated maintenance station (not shown) that is movable along a row of spinning stations, wherein a stop option is provided at a selected spinning station where maintenance operation is required.

[0106] The robotic arm 14 may have at least six degrees of freedom to allow the drive tool 13 to be positioned at the front of the traction frame 3, thereby engaging with the reset actuator arm 10 and driving the reset mechanism.

[0107] Figure 6 A drive tool 13 is shown, configured as a yarn handling tool for a yarn splicing system. In the illustrated embodiment, the yarn handling tool is provided with a clamping element 15, which is configured as a protrusion for engaging with a reset actuator arm 10 at the front of the traction frame 3 (see [link]). Figure 7 Subsequently, the same yarn handling tool is used to fasten auxiliary yarns (not shown) to the outside of the yarn feed nozzle for threading and splicing operations, thereby repairing broken yarns.

[0108] The following is a description of a method for monitoring the roving supply at the spinning station of a ring spinning machine, wherein the ring spinning machine uses a reference... Figures 1 to 11 The roving stop assembly that is required to be protected.

[0109] The breakage of yarn or continuous filament is detected by means of at least one sensor (not shown), which is arranged to detect the absence or change of movement of the traveler along the loop of the spindle assembly 20, and / or to detect the absence of continuous filament fed to the traction frame 3.

[0110] In the first step, the processing and control device of the roving stop assembly 1 receives yarn breakage signals and / or filament breakage signals from sensors used to detect breakage of yarn and / or continuous filament at the spinning station.

[0111] Subsequently, in the second step, the processing and control device forwards the yarn breakage signal and / or filament breakage signal to energize the electromagnetic actuator 9, thereby triggering the drive of the triggering member 5. Driving the triggering member 5 causes the sliding member 6 to be released to the rearward aroused position, wherein the roving stop element 4 is in the active position, interrupting the roving supply.

[0112] In the third step, the processing and control device forwards the maintenance signal to an automated maintenance station (not shown), which is movable along a row of spinning stations to stop at a selected spinning station where maintenance is required. The maintenance station includes a drive tool 13 for actuating the reset actuator arm 10. In one embodiment, the drive tool 13 is attached to a robotic arm 14 and includes a clamping element 15 for engaging the reset actuator arm 10.

[0113] In the fourth step, before beginning the repair of broken yarns and / or broken continuous filaments, or before splicing, the processing and control device forwards a roving reset signal to the robotic arm 14 to position the clamping element 15 of the drive tool 13 into engagement with the reset actuator arm 10 located at the front of the traction frame 3. In the illustrated embodiment, pulling on the reset actuator arm 10 causes the sliding member 6 to be displaced to a forward, non-activated position and causes the roving stop element 4 to be displaced to an inactive position, thereby restoring the roving supply.

[0114] As described above, in the claimed roving stop device, the roving supply can be restored simply by actuating the reset actuator arm 10 located at the front of the traction frame. Therefore, the operator or drive equipment does not need to enter the interior of the traction frame 3 to reset the roving stop element 4 to its inactive position. Consequently, the handling operation between spindle positions becomes easier and more reliable.

[0115] Those skilled in the art can introduce changes and modifications to the described embodiments without departing from the scope of the invention as defined in the appended claims. For example, although an embodiment in which the reset stop arm 10 is mounted to cooperate with the sliding member 6 of the reset mechanism has been disclosed, it is also possible for the reset stop arm 10 to be mounted to cooperate with reset mechanisms of different configurations. In any case, the reset mechanism should be operatively connected to the roving stop element to allow the roving stop element to be displaced to an inactive position, thereby restoring the roving supply. Similarly, although a roving stop element 4 configured as a wedge and hinged to the sliding member 6 has been disclosed, it is still possible to provide roving stop elements of different configurations, such as roving stop elements of different configurations integrally fixed to the reset mechanism. It is also possible for the roving stop assembly to include not only one roving stop element, but also two roving stop elements arranged to act on different bottom traction rollers of the same traction frame.

Claims

1. A roving stop assembly (1) for a traction frame (3) of a ring spinning machine, wherein the traction frame (3) includes a pair of front traction rollers (3c), a pair of intermediate traction rollers (3b) and a pair of rear traction rollers (3a), and the roving stop assembly (1) includes: - At least one roving stop element (4), said roving stop element (4) being arranged to act in a movable position on one of the pair of rear traction rollers (3a) and / or the pair of intermediate traction rollers (3b) to stop the supply of roving at the spinning station of the ring spinning machine. - A triggering device (5, 9), operatively connected to the at least one roving stop element (4) to drive the at least one roving stop element (4) to an active position, and, - A reset device (6) that, by means of a reset mechanism (6, 7), resets the at least one roving stop element (4) to a non-active position, thereby restoring the roving supply. Its features are: - The reset device includes a reset actuator arm (10), which is arranged at the front of the traction frame (3), and wherein: - The reset actuator arm (10) is mounted to cooperate with the reset mechanism (6, 7), which is operatively connected to the at least one roving stop element (4) such that when the reset actuator arm (10) located at the front (F) of the traction frame (3) is actuated, the at least one roving stop element (4) is allowed to be displaced to an inactive position, thereby restoring the roving supply.

2. The roving stop assembly according to claim 1, wherein the roving stop assembly includes a drive device (13, 14, 15) for driving a reset actuator arm (10) located at the front (F) of the traction frame (3) of the ring spinning machine, thereby restoring the roving supply.

3. The roving stop assembly of claim 2, comprising an automatic maintenance station, the automatic maintenance station being movablely mounted along a row of spinning stations and having an option to stop at a selected spinning station where maintenance operation is required, wherein the drive device comprises a drive device arranged on the automatic maintenance station.

4. The roving stop assembly according to any one of claims 2 to 3, wherein the drive device includes a drive tool (13) for driving a reset actuator arm (10), the drive tool (13) being attachable to the robotic arm (14).

5. The roving stop assembly according to claim 4, wherein the drive tool (13) is a yarn handling tool that can be attached to a robotic arm (14) of the yarn splicing system.

6. The roving stop assembly (1) according to claim 5, wherein the yarn handling tool includes at least one clamping element (15) configured to drive a reset actuator arm (10) located at the front (F) of the traction frame.

7. The roving stop assembly (1) according to claim 1, wherein the triggering device includes a triggering member (5) which is mounted to cooperate with the reset mechanism (6, 7); - So that in the event of yarn breakage and / or continuous filament breakage, the reset mechanism (6, 7) is released to the activation position, and - so that when the reset actuator arm (10) is driven, the reset mechanism (6, 7) is held in the non-excited position.

8. The roving stop assembly (1) according to claim 1, wherein the reset mechanism includes a sliding member (6) associated with the reset actuator arm (10), and wherein the sliding member (6) is mounted to be displaceable in the longitudinal direction, thereby allowing at least the roving stop element (4) to be displaced to an inactive position when the reset actuator arm (10) is driven.

9. The roving stop assembly according to any one of claims 7 to 8, wherein the reset actuator arm (10) is removably attached to the reset mechanism.

10. The roving stop assembly according to claim 1, wherein the reset actuator arm (10) is configured to extend longitudinally to the front of the traction frame (3), wherein the distal portion of the reset actuator arm (10) includes a channel (11) adapted to allow the traction loop (12) to pass through and / or adapted to allow a suction tube (21) for sucking up broken fibers or broken filaments to pass through.

11. The roving stop assembly according to claim 7, wherein the reset mechanism includes a sliding member (6) associated with the reset actuator arm (10), and the trigger member (5) is mounted to cooperate with the sliding member (6) such that: - When the reset actuator arm (10) is driven, the sliding member (6) is easily held in the non-activated position by the trigger member (5), and - In the event of yarn breakage and / or continuous filament breakage, the sliding member (6) is easily released to the excitation position by the trigger member (5).

12. The roving stop assembly (1) according to claim 2, wherein the roving stop assembly (1) comprises: - A detection device for detecting the absence or variation of movement of the traveler along the loop of the spindle assembly (20) when the roving intended to be fed at the spinning position breaks, and / or a detection device for detecting the absence of the continuous filament when the continuous filament breaks during the production of the "core" yarn, and - The processing and control device is configured to: - Receive yarn breakage signals and / or filament breakage signals from the detection device. - The yarn breakage signal and / or filament breakage signal are forwarded to the triggering device (5, 9) to trigger the at least one roving stop element (4) to the active position, thereby stopping the roving supply, and subsequently, - Before the splicing operation, the roving reset signal is forwarded to the drive unit (13, 14, 15), which drives the reset actuator arm (10) located at the front (F) of the traction frame (3) so that the at least one roving stop element (4) is moved to the inactive position, thereby restoring the roving supply.

13. The roving stop assembly according to claim 12, wherein the roving stop assembly includes an automatic maintenance station, the automatic maintenance station comprising drive devices (13, 14, 15) for driving the reset actuator arm (10), and the processing and control device is further configured to: - Forward maintenance signals to the automated maintenance station, which is movable along a row of spinning stations and has the option to stop at a selected spinning station where maintenance operation is required.

14. The roving stop assembly according to claim 7, wherein the triggering device includes an electromagnetic actuator (9) for driving the triggering member (5), and wherein the electromagnetic actuator (9) is configured to be energized upon receiving a yarn breakage signal and / or a filament breakage signal in the event of yarn breakage and / or continuous filament breakage.

15. A ring spinning machine, comprising: A traction frame with multiple spinning stations (3); And, a roving stop assembly (1) located at each of these spinning stations, the roving stop assembly (1) being a roving stop assembly according to any one of claims 1 to 14, wherein each roving stop assembly (1) comprises: - At least one roving stop element (4). - A triggering device (5, 9), operably connected to the at least one roving stop element (4), and - The reset actuator arm (10) is positioned at the front (F) of the traction frame at each spinning position. - The reset actuator arm (10) is mounted to cooperate with a reset mechanism (6, 7) operatively connected to the at least one roving stop element (4) so ​​that when the reset actuator arm (10) located at the front (F) of the traction frame (3) is driven, the at least one roving stop element (4) is allowed to be displaced to an inactive position, thereby restoring the roving supply.

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