CN115404577A - Roving stop assembly for a drawing frame of a ring spinning machine and ring spinning machine - Google Patents
Roving stop assembly for a drawing frame of a ring spinning machine and ring spinning machine Download PDFInfo
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- CN115404577A CN115404577A CN202210585642.7A CN202210585642A CN115404577A CN 115404577 A CN115404577 A CN 115404577A CN 202210585642 A CN202210585642 A CN 202210585642A CN 115404577 A CN115404577 A CN 115404577A
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- roving stop
- actuator arm
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- yarn
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Classifications
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H13/00—Other common constructional features, details or accessories
- D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
- D01H13/16—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material
- D01H13/1616—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material characterised by the detector
- D01H13/1633—Electronic actuators
- D01H13/165—Photo-electric sensing means
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H13/00—Other common constructional features, details or accessories
- D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
- D01H13/16—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material
- D01H13/18—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material stopping supply only
- D01H13/185—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material stopping supply only a plate moving in the nip of drafting or guiding cylinders
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H15/00—Piecing arrangements ; Automatic end-finding, e.g. by suction and reverse package rotation; Devices for temporarily storing yarn during piecing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Abstract
Roving stop assembly (1) for a drawing frame (3) of a ring spinning machine, comprising: at least one roving stop element (4) arranged so as to be able to act, in an active position, on one of the pair of rear traction rollers (3 a) or on the pair of intermediate traction rollers (3 b); 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 means comprise a resetting actuator arm (10) arranged at the front (F) of the traction frame (3).
Description
Technical Field
The present invention generally relates to a roving stopping assembly for interrupting the supply of a roving when the yarn is manufactured at a spinning station of a ring spinning machine. The invention also relates to a ring spinning machine comprising: a drawing frame having a plurality of spinning stations; and a roving stop assembly located at each of the spinning stations.
Background
It is known to monitor, at a spinning position of a ring spinning machine, a breakage of a yarn to be fed to a spindle assembly.
Known spinning systems use roving stopping devices to stop the supply of the roving in time, preventing the loss of the roving due to breakage of the yarn while the spinning machine remains running. These roving stop devices comprise a roving stop element configured to act on the rear drawing roller, preventing the movement of the rear upper drawing roller, upon detection of a signal coming from an electric or electromagnetic sensor for monitoring the breakage of the yarn passing through the spindle assembly.
Document CN2844159Y discloses a prior art spinning machine comprising one of the above known roving stop devices, wherein the roving stop element is hinged to a sliding member and said sliding member is susceptible to being released to the 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, so that when the roving breaks, an interruption of the roving occurs, thus preventing the supply of the roving.
It is also known to make "Core" yarns by means of a continuous spinning process. This type of yarn combines one or two continuous filaments with elastic properties on a single yarn axis and is covered with fibers from a cotton roving or similar roving. For the manufacture of "core" yarns, continuous filaments of elastomeric material (such as elastic or spandex fibers) are generally used, for example under the trademark elastane
The case (1). It is known that these continuous filaments are susceptible to breakage, in which case 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 the roving in time, preventing the production of defective yarns lacking continuous filaments. Many of these roving stop devices employ electrical sensors that monitor 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 driving 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 traction rollers so as to sandwich the roving.
The roving stopping device comprises a resetting device 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 the broken filament.
However, when producing yarn on a ring spinning machine, the distance between the spindle pitches or positions is so narrow that it is difficult for an operator to perform a processing operation intended to return the roving stop member to its inactive position to resume the supply of roving. In particular in the production of "core" yarns, the handling operation between spindle positions requires great care in order that the process does not cause breakage of the very fine continuous filaments fed to the adjacent spindle assemblies.
Therefore, there is a need to provide an alternative to the prior art which overcomes the above-mentioned drawbacks and significantly improves the reliability of the handling operations performed when the ring spinning machine produces yarn by providing a roving stop assembly which covers the drawbacks of the prior art.
Disclosure of Invention
To this end, the present invention relates in a first aspect to a roving stop assembly for interrupting the supply of a roving during the production of a yarn by a ring spinning machine, wherein the drawing frame of the ring spinning machine comprises a pair of front drawing rollers, a pair of intermediate drawing rollers and a pair of rear drawing rollers, the roving stop assembly comprising:
-at least one roving stop element arranged to be able to act, in an active position, on one of said pair of rear traction rollers or said pair of intermediate traction rollers in order to stop the supply of roving at the spinning station of the ring spinning machine.
A trigger device operatively connected to at least the roving stop element for triggering the driving of at least the roving stop element into an active position, and,
a resetting device which resets at least the roving stopping element to the inactive position by means of a resetting mechanism, thereby restoring the supply of roving.
In contrast to the known roving stop assembly, the roving stop assembly proposed by the first aspect of the invention is characterized in that the resetting means comprise a resetting actuator arm arranged at the front of the traction frame. The reset actuator arm is mounted to cooperate with a reset mechanism operatively connected to at least the roving stop element, such that when the reset actuator arm at the front of the traction frame is driven, at least the roving stop element is allowed to be displaced to an inactive position, thereby restoring the supply of roving.
The expression "at the front of the traction frame" is to be understood as being at the most forward position of the traction frame, preferably beside or close to the front rollers of the traction frame.
Thanks to the claimed features, the invention provides a roving stop assembly in which the resetting 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 cooperating with a reset mechanism.
In fact, with the roving stop assembly as claimed, the supply of roving can be resumed by simply driving the reset actuator arm located at the front of the traction frame. Thus, the roving stop element can be reset to its inactive position without the operator having to enter the interior of the traction frame. Therefore, the processing operation between the spindle positions becomes easier and more reliable.
Preferably, the roving stop assembly comprises a drive device for automatically driving a reset actuator arm located at the front of the drawing frame of the ring spinning machine in order to resume the supply of roving before the operator or mechanical arm is ready to start repairing the broken yarn or the broken filament (e.g. ready to start the splicing operation).
According to one embodiment, the drive arrangement comprises a drive device arranged on an automatic service station, which is displaceably mounted along a row of spinning stations and has the option of stopping at a selected spinning station requiring a service operation.
Preferably, thanks to these claimed features, the invention provides a roving stop assembly that does not require the presence of an operator to manually reset the roving stop element to resume the supply of roving, in the event of yarn breakage and/or continuous filament breakage.
Advantageously, the driving device may comprise, for example, a piston and cylinder assembly, or other equivalent driving assembly or device, arranged or not on the automatic maintenance station, in order to drive the return actuator arm at the front of the traction frame at the spinning station where the maintenance operation is required.
It is also advantageous that the drive means comprise a drive means for driving the reset actuator arm, which drive means can be attached to the robot arm.
The robotic arm may have at least six degrees of freedom of movement to allow positioning of a drive tool at the front of the draft frame to automatically drive (push or pull) a reset actuator arm at the front of the draft frame.
According to a preferred embodiment, the drive means is a yarn handling means, such as a yarn splicing system, which is preferably attachable to a robot arm of the yarn splicing system performing an automatic splicing operation.
Advantageously, the drive tool or yarn handling tool is provided with a clamping element, for example configured as a protrusion or projection, for driving or engaging a reset actuator arm at the front of the traction frame.
Preferably, the trigger means of the roving stop assembly comprises a trigger member mounted to cooperate with the reset mechanism to release the reset mechanism to the energized position after a yarn break or continuous filament break and to hold the reset mechanism to the non-energized position after driving the reset actuator arm.
Thus, when the reset actuator arm is driven, the reset mechanism is displaced to take up a non-energized position and the trigger member cooperates to hold the reset mechanism in this non-energized position, wherein at least the roving stop element is in an inactive position, allowing the supply of rovings to be resumed.
According to a preferred embodiment, the reset mechanism comprises a sliding member associated with the reset actuator arm and mounted displaceable in the longitudinal direction, thereby allowing displacement of at least the roving stop element to the inactive position upon driving of the reset actuator arm.
For the preferred embodiment described above, the trigger member is mounted to cooperate with the slide member such that:
the sliding member is apt to be held in the non-activated position by the trigger member after driving the reset actuator arm, and
-the sliding member is susceptible to being released to the activated position by the triggering member upon yarn breakage and/or continuous filament breakage.
Preferably, potential energy can be accumulated when the sliding member is displaced by the reset actuator arm until the triggered member remains in its un-fired position. Upon yarn breakage and/or continuous filament breakage, the accumulated potential energy is readily transferred as motion to at least the roving stop element when the trigger member releases the sliding member.
Advantageously, the sliding member is able to accumulate potential energy resulting from a compression force applied to the spring or to an equivalent or similar element to allow the sliding member to resume position.
For one embodiment, the sliding member comprises: a groove or recess that interacts with a trigger member; and a spring arranged to be compressed by displacing the sliding member to the non-energized position until the trigger member locks the sliding member.
Preferably, the reset actuator arm is configured such that it extends longitudinally to the front of the traction frame, for example to a position alongside the bottom front roller.
Also 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.
For one embodiment, the reset actuator arm is configured to form a unitary piece with the slide member, extending longitudinally to the front of the draft frame.
However, according to an alternative embodiment, the reset actuator arm comprises a separate piece removably attached to the sliding member, extending longitudinally to the front of the traction frame.
This alternative embodiment has the advantage of allowing an existing roving stop assembly to be easily adjusted or converted to the claimed roving stop assembly.
Preferably, the distal portion of the reset actuator arm comprises or forms a passage adapted to pass at least one pulling apron wound around the bottom intermediate pulling roll and/or at least one suction tube adapted to suck broken fibres or filaments.
Also preferably, the roving stop assembly comprises:
-detection means arranged for detecting, when the yarn breaks, the absence or variation of the movement of the traveler along the ring of the spindle assembly, and/or detection means for detecting, when the "core" yarn is produced, the absence of the continuous filaments at the spinning position, when the continuous filaments break, and
-processing and control means configured to:
-receiving a yarn break signal and/or a filament break signal from a detection device,
-forwarding a yarn breakage signal and/or a filament breakage signal to a triggering device for triggering the driving of at least the roving stop element to an active position, so as to stop the supply of roving, and subsequently,
-forwarding a roving reset signal to a driving device for automatically driving a reset actuator arm located at the front of the drawing frame of the ring spinning machine to cause at least the roving stop element to be displaced to the inactive position, thereby resuming the supply of roving, prior to the splicing operation.
For one embodiment, wherein the roving stop assembly comprises an automatic maintenance station comprising a drive device for resetting an actuator arm, the processing and control device is further configured to:
-forwarding a service signal to an automatic service station, which is displaceably mounted along a row of spinning stations and has the option of stopping at a selected spinning station requiring a service operation.
Further, if the drive tool is attached to a robotic arm, the processing and control apparatus is configured to:
-providing a roving reset signal to the mechanical arm to allow the mechanical arm to position the driving tool at the reset actuator arm in order to push or pull the reset actuator arm at the front of the traction frame by means of the driving tool.
Advantageously, the detection means comprise an optical sensor arranged close to the spindle assembly to detect the movement of the traveller and to output a signal of the absence or variation of movement of the traveller in the event of yarn breakage.
Once drawn, the rovings or yarns pass down to a spindle assembly where they pass through small loops known as traveler, as is well known. The traveller moves along a ring arranged coaxially with the spindle. There, the yarn is attached to an existing yarn on the spindle. The traveler shares the same axis with the spindle, but rotates at a different speed. The spindle is driven and the traveller falls behind, thereby distributing the rotation between the winding of the spindle and the twisting of the yarn. The mentioned optical sensors continuously control the state and RPM of each spinning position and the data collected from them are transferred to monitoring software which sends roving stop signals to the processing and control means of the roving stop assembly. The optical sensor has the advantage of providing ultra-fast detection and communication, since it allows to detect yarn breakage in less than one second, thus immediately initiating a roving interruption.
Preferably, the triggering device comprises an electromagnetic actuator for driving the triggering member, wherein the electromagnetic actuator is configured to be energized upon receipt of a yarn break signal and/or a filament break signal.
Advantageously, the driving tool is a yarn handling tool attached to a robotic arm, wherein the yarn handling tool comprises at least one gripping element configured to drive a reset actuator arm located at the front of the traction frame, preferably also configured to secure the auxiliary yarn on the outside of the yarn feed nozzle.
A clamping element is to be understood as an element for holding or gripping the yarn on the exterior of the yarn feed nozzle. This clamping element may be configured to be attached to a protrusion or projection of the yarn processing tool, e.g. the clamping element is configured or adapted to engage with the reset actuator arm, or to hold or grip a portion of the yarn on the exterior of the yarn feed nozzle.
Thanks to these features, the same tool attached to the robotic arm can be used to automatically reset at least the roving stop element, thus restoring the supply of roving and carrying out threading and splicing operations.
Preferably, at least the roving stop element is configured as a wedge, for example with a curved surface, arranged to be inserted between a pair of rear drawing rollers or a pair of intermediate drawing rollers in its active position to stop the supply of roving. 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.
A second aspect of the present invention relates to a ring spinning machine comprising: a drawing frame with a plurality of spinning stations; and, a roving stop assembly as claimed at each of these spinning stations, wherein each said roving stop assembly comprises:
-at least a roving stop element,
-a trigger device operatively connected to the at least roving stop element, and
a reset actuator arm arranged at the front of the traction frame at each spinning position,
-wherein the reset actuator arm is mounted to cooperate with a reset mechanism operatively connected to the at least roving stop element so as to allow the at least roving stop element to be displaced to an inactive position upon driving the reset actuator arm at the front of the traction frame, thereby restoring the supply of rovings.
A third aspect of the invention relates to a method of monitoring the supply of roving at a spinning position of a ring spinning machine by means of a roving stop assembly as claimed, wherein said assembly comprises a drive means for driving said reset actuator arm, and said method comprises the steps of:
a) Before starting the repair of the broken yarn and/or the broken continuous filament, for example before starting the splicing operation, a roving reset signal is forwarded to a drive device for automatically driving a reset actuator arm located at the front of the drawing frame of the ring spinning machine.
The broken yarn that must be repaired may be, for example, plain or "core" yarn.
In the present invention:
"Plain yarn" is understood to mean a yarn produced by pre-drawing and main drawing at least one roving by means of a single intermediate bottom drawing apron wound around an intermediate bottom drawing roller.
By "Core yarn" it is understood a yarn obtained by combining a Core formed by one, two or up to three continuous filaments with a bundle of roving fibers covering said filaments.
A "dual core" yarn is understood to be a yarn formed by combining a core formed by two continuous filaments with a roving fiber bundle covering said filaments.
"continuous filaments" are understood to be textile fiber filaments of undefined length; preferably, the length of the synthetic fibers (e.g. filaments of elastane or polyester fibers) is obtained by extrusion.
"roving" or "roving fiber bundle" is understood to be a bundle of staple cotton, wool or viscose, or other similar natural or artificial staple fibres, intended or not for covering one or more continuous filaments when spinning the core yarn.
The threading operation is preferably understood to be an operation of creating or forming a threading section of the auxiliary yarn on the outside of the yarn feeding nozzle and processing the threading section at the flange of the ring spinning machine to thread the threading section into the ring traveler of the ring spinning machine.
A splicing operation is understood to be an operation in which a yarn handling tool for splicing threading-aid yarns is positioned on a roving issued from a front drawing roller of a drawing assembly of a ring spinning machine.
The expression "at the front of the traction frame" is to be understood as being at the most forward position of the traction frame, preferably beside or close to the bottom front roller.
Drawings
The foregoing and other advantages and features will be more fully understood from the following detailed description of embodiments, with reference to the accompanying drawings, which must be considered in an illustrative and non-limiting manner, and in which the following overview is given:
specifically, the method comprises the following steps:
fig. 1 illustrates a perspective view of one embodiment of a roving stop assembly showing a reset actuator arm attached to a slide member of a reset mechanism operably connected to a roving stop element.
Fig. 2 is a partially exploded perspective view of the roving stop assembly of fig. 1, showing a reset actuator arm configured as a separate piece removably attached to the slide member and a roving stop element configured as a wedge and inserted between a pair of rear pull rollers or a pair of middle pull rollers adapted to transport the roving.
Fig. 3 is a schematic perspective view showing two roving stop assemblies of fig. 1 mounted at two spinning stations of a drawing frame of a ring spinning machine with a bottom drawing apron of each intermediate bottom drawing roller passing through a channel provided on a distal end portion of each reset actuator arm. This figure shows the roving stop elements of the two roving stop assemblies acting in an active position on a pair of rear traction rollers to interrupt the supply of the roving. Upon yarn breakage, the slide member of each return mechanism is released to a rearward actuated position.
Fig. 4 is a schematic perspective view similar to the view of fig. 3 described above, in this case showing two roving stop assemblies with roving stop elements in inactive positions to allow supply of rovings (not shown). The slide member of each reset mechanism is driven by pulling the reset actuator arm until held in a forward non-energized position.
Fig. 5 is a schematic perspective view of a draft frame showing a plurality of roving stop assemblies at each spinning position. Some of the roving stop elements of the roving stop assembly are in an active position while other roving stop elements are in an inactive position. The reset actuator arm of the roving stop assembly with the roving stop element in the active position has a backward activation position, waiting for driving to resume the supply of roving. For clarity reasons, the traction rings of the upper traction rolls and the intermediate bottom traction rolls are not shown.
Fig. 6 is a schematic side view of the roving stop assembly of fig. 1, wherein the roving stop element acts on a pair of rear traction rollers in an active position to interrupt the supply of roving after receiving a yarn break signal. The slide member of the reset mechanism and the reset actuator arm are both in a rearward energized position. This figure shows an illustration of a drive tool provided with a gripping element in the form of a protrusion for engagement with a reset actuator arm at the front of the traction frame. For this embodiment, the drive tool is a yarn handling tool attached to a robotic arm of a yarn splicing system.
Fig. 7 is a schematic side view of the roving stop assembly of fig. 6 showing a drive tool pulling a reset actuator arm attached to a slide member of the reset mechanism.
Fig. 8 is a schematic side view of the roving stop assembly of fig. 1 with both the slide member and the reset actuator arm held in a forward non-energized position. In this position, the roving stop element is in an inactive position to allow the supply of the roving.
Fig. 9 is a schematic longitudinal cross-section of a roving stop assembly showing: a reset actuator arm attached to a sliding member of a reset mechanism operably connected to a 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 comprises: a sliding member provided 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.
Fig. 10 is a schematic longitudinal cross-section of a roving stop assembly similar to the longitudinal cross-section of fig. 9. In this figure, when the break signal is received, the sliding member of the reset mechanism is released to the rearward energized position by the trigger member upon energization of the electromagnetic actuator. The breakage signal comes from a detection device for detecting the absence or variation of the movement of the traveler along the ring of the spindle assembly when the yarn breaks and/or from a detection device for detecting the absence of the continuous filament when it breaks when the latter is produced.
Fig. 11 is a schematic side view of a ring spinning machine configured to produce a "twin core" yarn with the claimed roving stop assembly. The figure shows left and right draw frames, left and right roving frames, and left and right creels with spools arranged for "unwinding" two different continuous filaments. The first continuous filaments may be, for example, elastomeric filaments, such as those sold under the trademark
And the second continuous filament may be, for example, an INVISTA brand of
Continuous filaments of elastomeric polyester fibers. The roving may be, for example, a roll-broken cotton fiber. As illustrated in this figure, the ring spinning machine comprises the roving stop assembly of fig. 1 at each spinning position of the drawing frame, wherein each assembly comprises a reset actuator arm arranged at the front "F" of the drawing frame.
Detailed Description
The following is a description of the claimed invention with reference to fig. 1 to 11, which show exemplary embodiments of the invention, suitable for ring spinning machines suitable for producing yarns.
For example, the present invention may be applied to a ring spinning machine suitable for producing "two-core" yarns as shown in FIG. 11. This ring spinning machine comprises a row of spinning stations arranged adjacent to each other, and left and right drawing frames 3 with a pair of front drawing rolls 3c, a pair of intermediate drawing rolls 3b and a pair of rear drawing rolls 3 a. At each spinning station or position, a plurality of roving stop assemblies 1 are attached to the bars 2 of each drawing frame 3 of the ring spinning machine. The roving spools 16 are hung on left and right roving supports 17, left and right creels 18 being provided with spools 19 arranged for "unwinding" two different continuous filaments.
Fig. 5 shows a schematic perspective view of one of the traction frames 3 in fig. 11, showing a plurality of roving stop assemblies 1 attached to the rod 2. For the sake of clarity, this figure does not show the upper pulling rolls of the pulling frame 3, but only the lower pulling rolls of the pulling frame 3.
Each claimed roving stop assembly 1 comprises:
at least one roving stop element 4, said roving stop element 4 being arranged so as to be able to act in an active position on a pair of rear or intermediate drawing rollers 3a responsible for conveying the roving to be drawn,
a triggering device operatively connected to the roving stop element 4 for triggering the driving of the roving stop element 4 into the active position after yarn breakage or continuous filament breakage, and
a resetting device for resetting at least the roving stopping element 4 to the inactive position by means of a resetting mechanism, so as to resume the supply of roving, so that the operator can start repairing the broken yarn or the broken filament.
For the embodiment shown, the trigger means comprises a trigger member 5 mounted to cooperate with a reset mechanism comprising a slide member 6 susceptible of being held in a forward non-activated position by the trigger member 5. Specifically, the slide member 6 includes: a recess 7 for the triggering member 5; and a spring 8, said spring 8 being 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 fig. 9).
In the forward non-energized position of fig. 9, the sliding member 6 is able to accumulate potential energy derived from the compression force applied to the spring 8. This accumulated potential energy is easily transmitted as a movement to at least the roving stop element 4 when the trigger member 5 releases the sliding member 6 to the rearward activated position upon yarn breakage or continuous filament breakage (see fig. 10).
For the embodiment shown, the triggering means comprises an electromagnetic actuator 9, such as a solenoid and piston assembly for driving the triggering member 5. Upon yarn breakage and/or continuous filament breakage, the electromagnetic actuator 9 is energized when a yarn and/or filament breakage signal is received. The break signal may come from a detection device, such as a sensor, for detecting the absence or change of movement of the traveler along the ring of spindle assembly 20 when the yarn breaks, or from a detection device, such as another sensor, for detecting the absence of continuous filaments when they break.
In contrast to known roving stop assemblies, in the assembly proposed by the invention the resetting means comprise a resetting actuator arm 10, said resetting actuator arm 10 being arranged at the front of the traction frame 3, or at the most forward 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 draft frame 3.
For the embodiment shown, the reset actuator arm 10 comprises a separate piece removably attached to the sliding member 6 that is configured to extend longitudinally to the front of the traction frame 3. This embodiment has the advantage of allowing easy conversion of an existing roving stop assembly into the claimed roving stop assembly.
As can be seen in the figures, the return actuator arm 10 extends longitudinally to the front of the drawing frame 3, wherein the distal portion of the return actuator arm 10 forms a channel 11, said channel 11 being adapted to pass a bottom drawing apron 12 of the bottom intermediate drawing roller 3b (see fig. 3 and 4). The same channel 11 is also suitable for the passage of a suction pipe 21 (see fig. 11), which suction pipe 21 serves to suck broken fibers or broken filaments.
Fig. 3 shows a schematic view of a pair of roving stop assemblies mounted at two spinning stations of the traction frame 3. In this figure, upon yarn breakage, the roving stop element 4 of each roving stop assembly acts on the pair of rear traction rollers 3a in the active position, interrupting the supply of the roving, with the corresponding sliding mechanism 6 of the return mechanism released to the rearward active position.
The reset actuator arm 10 is mounted to cooperate with the slide member 6 of the reset mechanism. This sliding member 6 is operatively connected with the roving stop element 4 to allow the roving stop element 4 to be displaced to an inactive position upon actuation of the reset actuator arm 10, so as to resume the supply of roving (see fig. 4).
As disclosed above, in the claimed roving stop device, the supply of roving can be resumed by simply driving the reset actuator arm 10 located at the front of the traction frame 3. Thus, the operator does not need to enter the interior of the traction frame 3 to reset the roving stop element 4, making the handling operations between spindle positions easier and more reliable.
For the preferred embodiment shown in fig. 6 and 7, the roving stop assembly comprises a drive means for automatically driving the reset actuator arm 10 located at the front of the traction frame 3, so as to resume the supply of roving. In this way, the advantage of the roving stop assembly is that an operator for manually resetting the roving stop element 4 can be dispensed with.
In the embodiment shown in fig. 6 and 7, the drive means comprise a drive tool 13 attached to a robot arm 14, and said robot arm 14 is arranged on an automatic service station (not shown) which is displaceably mounted along a row of spinning stations, with the option of stopping at a selected spinning station requiring a service operation.
The robotic arm 14 may have at least six degrees of freedom of movement to allow positioning of the drive tool 13 at the front of the traction frame 3 to engage with the reset actuator arm 10 for driving the reset mechanism.
Fig. 6 shows a drive tool 13, which drive tool 13 is configured as a yarn handling tool of a yarn splicing system. In the shown embodiment, the yarn handling tool is provided with a clamping element 15, which clamping element 15 is configured as a protrusion for engagement with the reset actuator arm 10 at the front of the traction frame 3 (see fig. 7). The same yarn processing tool is then used to tighten an auxiliary yarn (not shown) on the outside of the yarn feed nozzle for threading and splicing operations to repair broken yarns.
The following is a description of a method for monitoring roving supply at a spinning station of a ring spinning machine that uses the claimed roving stop assembly with reference to fig. 1-11.
The breakage of the yarn or of the continuous filaments is detected by means of at least one sensor (not shown) arranged for detecting the absence or variation of the movement of the traveller along the ring of the spindle assembly 20 and/or arranged for detecting the absence of the continuous filaments fed to the traction frame 3.
In a first step, the processing and control device of the roving stop assembly 1 receives a yarn breakage signal and/or a filament breakage signal from a sensor for detecting the breakage of the yarn and/or continuous filaments at the spinning station.
Subsequently, in a second step, the processing and control means relay the yarn breakage signal and/or the filament breakage signal to energize the electromagnetic actuator 9 to trigger the driving of said triggering member 5. Actuating the trigger member 5 causes the sliding member 6 to be released to the rearward actuated position, in which the roving stop element 4 is in the active position, interrupting the supply of roving.
In a third step, the processing and control means forward the maintenance signal to an automatic maintenance station (not shown) which is displaceably mounted along a row of spinning stations, stopping at the selected spinning station requiring maintenance operations. The service station comprises a drive tool 13 for driving the reset actuator arm 10. For one embodiment, the drive tool 13 is attached to a robotic arm 14 and includes a gripping element 15 for engaging the reset actuator arm 10.
In a fourth step, before starting the repair of the broken yarn and/or the broken continuous filament, or before splicing, the processing and control device forwards a roving reset signal to the mechanical arm 14 to position the gripping element 15 of the driving tool 13 in engagement with the reset actuator arm 10 located at the front of the traction frame 3. For the embodiment shown, pulling of the reset actuator arm 10 causes the sliding member 6 to be displaced to the forward non-energized position and causes the roving stop element 4 to be displaced to the inactive position, thereby restoring the supply of roving.
As described above, in the claimed roving stop device, the supply of roving can be resumed by simply driving the reset actuator arm 10 located at the front of the traction frame. Thus, the operator or the drive device does not need to enter the interior of the traction frame 3 to reset the roving stop element 4 to its inactive position. Therefore, the processing operation between the spindle positions becomes easier and more reliable.
Variations and modifications to the described embodiments may be introduced by those skilled in the art without departing from the scope of the invention as defined in the appended claims. For example, although embodiments have been disclosed in which the reset stop arm 10 is mounted to cooperate with the slide member 6 of the reset mechanism, it is possible that the reset stop arm 10 is mounted to cooperate with a differently configured reset mechanism. In any case, the reset mechanism should be operatively connected to the roving stop element to allow shifting the roving stop element to the inactive position to resume the supply of roving. Also, although a roving stop element 4 configured as a wedge and hinged with the sliding member 6 has been disclosed, it is possible to provide different configurations of roving stop elements, for example integrally fixed to the reset mechanism. It would also be possible that the roving stop assembly comprises not only one roving stop element, but also two roving stop elements arranged to act on different bottom drawing rollers of the same drawing frame.
Claims (15)
1. Roving stop assembly (1) for a drawing frame (3) of a ring spinning machine, wherein said drawing frame (3) comprises a pair of front drawing rollers (3 c), a pair of intermediate drawing rollers (3 b) and a pair of rear drawing rollers (3 a), said 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 drawing rollers (3 a) and/or said pair of intermediate drawing rollers (3 b) in an active position in order to stop the supply of roving at a spinning station of said ring spinning machine,
-a trigger device (5, 9), the trigger device (5, 9) being operatively connected to at least the roving stop element (4) for driving triggering of at least the roving stop element (4) to an active position, and,
-a resetting device (6), the resetting device (6) resetting at least the roving stop element (4) to an inactive position by means of a resetting mechanism (6, 7) so as to resume the supply of roving,
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 at least the roving stop element (4) so as to allow at least the roving stop element (4) to be displaced to an inactive position when driving the reset actuator arm (10) at the front (F) of the traction frame (3), thereby restoring the supply of rovings.
2. Roving stop assembly according to claim 1, wherein it comprises a drive means (13, 14, 15), said drive means (13, 14, 15) being intended to drive a reset actuator arm (10) located at the front (F) of the drawing frame (3) of the ring spinning machine, so as to resume the supply of roving.
3. The roving stop assembly according to claim 2, wherein the drive means comprises a drive device arranged on an automatic service station which is displaceably mounted along a row of spinning stations and has the option of stopping at a selected spinning station requiring a service operation.
4. Roving stop assembly according to any of claims 2 to 3, wherein the driving means comprise a driving tool (13) for driving a reset actuator arm (10), the driving tool (13) being attachable to a robotic arm (14).
5. The roving stop assembly according to claim 4, wherein the drive means (13) is a yarn handling means attachable to a robotic arm (14) of a yarn splicing system.
6. The roving stop assembly (1) according to claim 5, wherein the yarn handling tool comprises at least one clamping element (15), said at least one clamping element (15) being configured to drive a reset actuator arm (10) at the front (F) of the traction frame, preferably also configured to secure an auxiliary yarn on the outside of the yarn feeding nozzle.
7. The roving stop assembly (1) according to any of claims 1 to 6, wherein the trigger device comprises a trigger member (5), the trigger member (5) being mounted to cooperate with the reset mechanism (6, 7);
-to release the return means (6, 7) to the activated position upon breakage of the yarn and/or of the continuous filament, and
-to hold the reset mechanism (6, 7) in a non-activated position when the reset actuator arm (10) is driven.
8. Roving stop assembly (1) according to any of claims 1 to 7, 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 the longitudinal direction allowing to displace at least the roving stop element (4) to an inactive position upon driving the reset actuator arm (10).
9. Roving stop assembly according to any of claims 7 to 8, wherein the reset actuator arm (10) is removably attached to the reset mechanism, preferably to a sliding member (6) of the reset mechanism.
10. The roving stop assembly according to any of claims 1 to 9, wherein the reset actuator arm (10) is configured to extend longitudinally to the front of the traction frame (3), wherein a distal end portion of the reset actuator arm (10) comprises a channel (11), said channel (11) being adapted to allow passage of a traction apron (12) and/or to allow passage of a suction tube (21) for sucking broken fibers or broken filaments.
11. The roving stop assembly according to claim 7 or 8, wherein the trigger member (5) is mounted to cooperate with a sliding member (6) such that:
-said sliding member (6) is apt to be kept in a non-activated position by a trigger member (5) when driving said reset actuator arm (10), and
-said sliding member (6) is susceptible to being released to the activated position by the triggering member (5) upon yarn breakage and/or continuous filament breakage.
12. Roving stop assembly (1) according to any of claims 1 to 11 when dependent on claim 2, wherein the roving stop assembly (1) comprises:
-detection means arranged for detecting the absence or variation of the movement of the traveller along the ring of the spindle assembly (20) when the roving intended to be fed at the spinning position breaks, and/or for detecting the absence of the 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 means,
-forwarding the yarn breakage signal and/or filament breakage signal to the triggering device (5, 9) to trigger driving of at least the roving stop element (4) to an active position, so as to stop the supply of roving, and subsequently,
-forwarding a roving reset signal to a driving means (13, 14, 15) for driving a reset actuator arm (10) at the front (F) of the traction frame (3) to cause at least the roving stop element (4) to be displaced to an inactive position, so as to resume the supply of roving, before the splicing operation.
13. The roving stop assembly according to claim 12, wherein the roving stop assembly comprises an automatic maintenance station comprising a driving device (13, 14, 15) for driving the reset actuator arm (10), and the processing and control device is further configured to:
-forwarding a maintenance signal to the automatic maintenance station, which is displaceably mounted along a row of spinning stations and has the option of stopping at a selected spinning station requiring maintenance operations.
14. Roving stop assembly according to any of claims 12 to 13 when dependent on claim 7, wherein the triggering device 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. A ring spinning machine comprising: a drawing frame (3) with a plurality of spinning stations; and, a roving stop assembly (1) located at each of these spinning stations, the roving stop assembly (1) being according to any one of claims 1 to 14, wherein each roving stop assembly (1) comprises:
-at least a roving stop element (4),
-a triggering device (5, 9), the triggering device (5, 9) being operatively connected to at least the roving stop element (4), and
a reset actuator arm (10) arranged at the front (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 at least the roving stop element (4) so as to allow at least the 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), thereby restoring the supply of rovings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP21382483.2A EP4095295A1 (en) | 2021-05-28 | 2021-05-28 | Roving stop assembly for a drafting frame of a ring spinning machine and ring spinning machine including the roving stop assembly |
| EP21382483.2 | 2021-05-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115404577A true CN115404577A (en) | 2022-11-29 |
Family
ID=76197403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210585642.7A Pending CN115404577A (en) | 2021-05-28 | 2022-05-27 | Roving stop assembly for a drawing frame of a ring spinning machine and ring spinning machine |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP4095295A1 (en) |
| CN (1) | CN115404577A (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0251268B1 (en) * | 1986-07-03 | 1991-10-02 | Zinser Textilmaschinen GmbH | Device for spinning yarns |
| DE3815202A1 (en) * | 1988-05-04 | 1989-11-23 | Zinser Textilmaschinen Gmbh | Roving stop device |
| DE4032018C1 (en) * | 1990-10-09 | 1991-09-19 | Zinser Textilmaschinen Gmbh, 7333 Ebersbach, De | Drawing system incorporating slubbing stopping devices - has parts that can be locked on support rail allowing simple and quick replacement of parts |
| CN2844159Y (en) | 2005-10-24 | 2006-12-06 | 太平洋机电(集团)有限公司 | Self-stopping feeder of spun yarn broken end and ends |
| EP3696302A1 (en) * | 2019-02-12 | 2020-08-19 | Pinter Caipo, S.A.U. | A spinning system and method of spinning plain yarn or fancy yarn with said spinning system |
| CN210684055U (en) * | 2019-08-13 | 2020-06-05 | 上海兰宝传感科技股份有限公司 | Automatic stop feeding device for front reset spun yarn broken end and roving |
-
2021
- 2021-05-28 EP EP21382483.2A patent/EP4095295A1/en active Pending
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2022
- 2022-05-27 CN CN202210585642.7A patent/CN115404577A/en active Pending
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| EP4095295A1 (en) | 2022-11-30 |
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