CN-115404577-B - Roving stop assembly for a traction frame of a ring spinning machine and ring spinning machine

CN115404577BCN 115404577 BCN115404577 BCN 115404577BCN-115404577-B

Abstract

Roving stop assembly (1) for a traction 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 rear traction rollers (3 a) or a pair of intermediate traction rollers (3 b) in an active position, triggering means (5, 9) operatively connected to at least the roving stop element (4) to trigger driving of at least the roving stop element (4) to the active position, and resetting means (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 means comprise a resetting actuator arm (10) arranged at the front (F) of the traction frame (3).

Inventors

1. Jill Benetmas

Assignees

平特凯博个人股份有限公司

Dates

Publication Date: 20260505
Application Date: 20220527
Priority Date: 20210528

Claims (15)

1. Roving stop assembly (1) for a traction frame (3) of a ring spinning machine, wherein the traction frame (3) comprises a pair of front traction rollers (3 c), a pair of intermediate traction rollers (3 b) and a pair of rear traction rollers (3 a), the roving stop assembly (1) comprising: -at least one roving stop element (4), said roving stop element (4) being arranged to be able to act on one of said pair of rear pulling rolls (3 a) and/or said pair of intermediate pulling rolls (3 b) in a movable position in order to stop the supply of roving at the spinning station of the ring spinning machine, -A triggering device (5, 9), said triggering device (5, 9) being operatively connected to said at least one roving stop element (4) to drive triggering said at least one roving stop element (4) to an active position, and -A resetting device (6), said resetting device (6) resetting said at least one roving stop element (4) to an inactive position by means of a resetting mechanism (6, 7) so as to resume the supply of rovings, The method is characterized in that: -the resetting device comprises a resetting actuator arm (10), the resetting actuator arm (10) being 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), the reset mechanism (6, 7) being operatively connected to the at least one roving stop element (4) such that when the reset actuator arm (10) 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 supply of roving.
2. Roving stop assembly according to claim 1, wherein the roving stop assembly comprises driving means (13, 14, 15), said driving means (13, 14, 15) being adapted to drive a reset actuator arm (10) at the front (F) of the traction frame (3) of the ring spinning machine, so as to resume the supply of the roving.
3. The roving stop assembly of claim 2 including an automatic repair station displaceably mounted along a row of spinning stations and having the option to stop at a selected spinning station requiring repair operations, wherein the drive means comprises a drive device arranged on the automatic repair station.
4. A roving stop assembly according to any one of claims 2-3, wherein the driving means comprises a driving tool (13) for driving a reset actuator arm (10), the driving tool (13) being attachable to a robotic arm (14).
5. Roving stop assembly according to claim 4, wherein the driving means (13) is a yarn handling means attachable to a mechanical arm (14) of a yarn splicing system.
6. Roving stop assembly (1) according to claim 5, wherein the yarn handling tool comprises at least one gripping element (15), the at least one gripping element (15) being configured to drive a reset actuator arm (10) located at the front (F) of the traction frame.
7. Roving stop assembly (1) according to claim 1, wherein the triggering means comprise a triggering member (5), the triggering member (5) being mounted to cooperate with the reset mechanism (6, 7); -to release the resetting means (6, 7) to the activated position upon yarn breakage and/or continuous filament breakage, and -To hold the reset mechanism (6, 7) in the non-energized position when the reset actuator arm (10) is driven.
8. Roving stop assembly (1) according to claim 1, wherein the reset mechanism comprises a sliding member (6) associated with a reset actuator arm (10), and wherein the sliding member (6) is mounted displaceable in a longitudinal direction allowing to displace at least the roving stop element (4) to an inactive position upon driving the reset actuator arm (10).
9. The roving stop assembly according to any one of claims 7-8 wherein the reset actuator arm (10) is removably attached to the reset mechanism.
10. Roving stop assembly according to claim 1, wherein the return actuator arm (10) is configured to extend longitudinally to the front of the traction frame (3), wherein a distal end portion of the return actuator arm (10) comprises a channel (11), the channel (11) being adapted to allow the passage of a traction apron (12) and/or to allow the passage of a suction tube (21) for sucking broken fibres or broken filaments.
11. Roving stop assembly according to claim 7, wherein the return mechanism comprises a sliding member (6) associated with a return actuator arm (10) and the trigger member (5) is mounted to cooperate with the sliding member (6) such that: -said sliding member (6) is easily held in a non-activated position by the triggering member (5) when said reset actuator arm (10) is driven, and -Said sliding member (6) is easily released by the triggering member (5) to the activated position upon yarn breakage and/or continuous filament breakage.
12. The roving stop assembly (1) according to claim 2, wherein the roving stop assembly (1) comprises: -detection means for detecting the absence or variation of the movement of the bead ring along the ring of the spindle assembly (20) when the roving intended to be fed at the spinning position breaks, and/or detection means for detecting the absence of continuous filaments when they break during the production of the "core" yarn, and -Processing and control means configured to: Receiving a yarn break signal and/or a filament break signal from the detection device, Forwarding the yarn breakage signal and/or filament breakage signal to the triggering device (5, 9) to trigger driving the at least one roving stop element (4) to an active position, thereby stopping the supply of roving, and subsequently, -Forwarding the roving reset signal to driving means (13, 14, 15) for driving a reset actuator arm (10) at the front (F) of the traction frame (3) to cause the at least one roving stop element (4) to be displaced to an inactive position, thereby resuming the supply of roving, prior to the splicing operation.
13. The roving stop assembly according to claim 12 wherein the roving stop assembly comprises an automatic service station comprising a drive device (13, 14, 15) for driving the reset actuator arm (10) and the processing and control device is further configured to: -forwarding a service signal to the automatic service station, which is displaceably mounted along a row of spinning stations and has the option to stop at the selected spinning station requiring a service operation.
14. Roving stop assembly according to claim 7, wherein the triggering means comprises an electromagnetic actuator (9) for driving the triggering member (5), and wherein upon yarn breakage and/or continuous filament breakage the electromagnetic actuator (9) is configured to be energized upon receipt of a yarn breakage signal and/or a filament breakage signal.
15. Ring spinning machine comprising a traction frame (3) with a plurality of spinning stations, and a roving stop assembly (1) at each of these spinning stations, said 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), said triggering device (5, 9) being operatively connected to said at least one roving stop element (4), and A reset actuator arm (10) arranged at the front part (F) of the traction frame at each spinning position, -Wherein the reset actuator arm (10) is mounted to cooperate with a reset mechanism (6, 7), the reset mechanism (6, 7) being operatively connected to the at least one roving stop element (4) so as to allow the at least one roving stop element (4) to be displaced to an inactive position upon driving the reset actuator arm (10) at the front (F) of the traction frame (3) so as to resume the supply of rovings.

Description

Roving stop assembly for a traction frame of a ring spinning machine and ring spinning machine Technical Field The present invention relates generally to a roving (spinning) stop assembly for interrupting the supply of roving when manufacturing yarn at a spinning station of a ring spinning machine. The invention also relates to a ring spinning machine comprising a traction frame with a plurality of spinning stations, and a roving stop assembly at each of these spinning stations. Background It is known to monitor the breakage of a yarn to be fed to a spindle assembly at the spinning position of a ring spinning machine. The known spinning system uses a roving stopping device to stop the supply of roving in time, thus preventing the loss of roving due to breakage of yarn while the spinning machine remains running. These roving stopping devices comprise a roving stopping element configured to act on the rear traction roller upon detection of a signal from an electrical or electromagnetic sensor for monitoring the breakage of the yarn passing through the spindle assembly, thus preventing the movement of the rear upper traction roller. Document CN2844159Y discloses an existing spinning machine comprising one of the above known roving stopping devices, wherein the roving stopping element is hinged to a sliding member and said sliding member is easily released to the activated position by a trigger member when the yarn breaks. The stop element is clamped between a pair of rear pulling rolls in the active position, so that when the roving breaks, breakage of the roving occurs, thereby preventing the supply of the roving. It is also known to manufacture "Core" yarns by means of a continuous spinning process. Yarns of this type incorporate one or two continuous filaments having elastic properties on a single yarn shaft and are covered with fibers from cotton rovings or similar rovings. For the manufacture of "core" yarns, continuous filaments of elastomeric material (such as elastane or spandex fibers) are commonly employed, e.g., under the trademarkIs the case in (a). It is known that these continuous filaments are prone to breakage, in the event of which the supply of roving must be stopped in time to prevent the manufacture of defective yarns lacking the continuous filaments forming their cores. In the prior art, there are roving stopping devices for "core" yarn spinning machines, which stop the supply of rovings in time, thus preventing the manufacture of defective yarns lacking continuous filaments. Many of these roving stopping devices employ an electrical sensor that monitors the passage of the first and/or second continuous filaments. The sensors detect breakage of one of the continuous filaments and send a roving stop signal to an electromagnetic actuator associated with the trigger member to trigger actuation of at least one roving stop element to an active position to stop the supply of roving when one continuous filament breaks. The roving stop element in the active position acts on a pair of rear pulling rolls so that the roving is sandwiched therebetween. The above roving stopping device comprises a resetting means for resetting the roving stopping element to its inactive position by means of a resetting mechanism in order to resume the supply of roving before the operator starts to repair the broken yarn or broken filament. However, when producing yarn on a ring spinning machine, the spindle spacing or distance between spindle positions is so narrow that it is difficult for an operator to perform a handling operation aimed at resetting the roving stop element to its inactive position to resume the roving supply. Particularly in the production of "core" yarns, the handling operations between the spindle positions need to be very careful in order for the handling not to cause breakage of the very thin continuous filaments fed to the adjacent spindle assemblies. Accordingly, there is a need to provide an alternative to the prior art that overcomes the above-described drawbacks by providing a roving stop assembly that covers the drawbacks of the prior art and that significantly improves the reliability of the handling operation when the ring spinning machine is producing yarn. Disclosure of Invention To this end, the present invention relates in a first aspect to a roving stop assembly for interrupting the supply of roving during production of yarn by a ring-spinning machine, wherein a traction frame of the ring-spinning machine comprises a pair of front traction rollers, a pair of intermediate traction rollers and a pair of rear traction rollers, the roving stop assembly comprising: -at least one roving stop element arranged to be able to act on one of the pair of rear pulling rolls or the pair of intermediate pulling rolls in an active position in order to stop the supply of roving at the spinning station of the ring spinning machine. -A triggering device operatively connected to at least the roving stop