Classifications

• • 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
  • D01H13/005—Service carriages travelling along the machines
• • 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
  • D01H13/145—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements set on carriages travelling along the machines; Warning or safety devices pulled along the working unit by a band or the like
• • 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
  • D01H13/26—Arrangements facilitating the inspection or testing of yarns or the like in connection with spinning or twisting
• • 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
  • D01H13/32—Counting, measuring, recording or registering devices
• • 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
  • D01H15/013—Carriages travelling along the machines
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01H—SPINNING OR TWISTING
  • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
  • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
  • D01H5/60—Arrangements maintaining drafting elements free of fibre accumulations

Definitions

• the invention relates to an attending device for a ring spinning machine for producing yarn which comprises, arranged in its supporting structure, means for mounting displaceable on the machine along at least one row of workstations and for moving along that row of workstations, means for carrying out service operations at the workstations of the machine and which further comprises a power supply system and a control system.
• the invention relates to a ring spinning machine on which the above-mentioned attending device is arranged and to a method of using the attending device to detect the working state at the workstation of the ring spinning machine.
• Document US5347449 discloses a method and a system for eliminating malfunctions in textile machines, especially spinning machines. Malfunction signals are transmitted from the machine to a process control computer which controls the elimination of the malfunctions. The process control computer then activates an alarm call transmitter which calls a desired specialist to eliminate the malfunction in the machine.
• Document GB1186946 discloses an optical detector, arranged on an attending spinning-in device, which is used to confirm the completion of the yam spinning-in operation.
• This detector consists of a projector, illuminating the yam between draw-off rollers with a corresponding yam guide member of a ring spinning machine, and a receiver for reflected light from the yam and a photoelectric transducer which transforms the output of the light receiver, whereby frequencies corresponding to the frequency of the vibration of the yam are detected and the absence of yam is distinguished by comparing the outputs of the device.
• Document JP2017172096 describes a method for automatically detecting yam breakage and/or spindle defects.
• a control system is provided for this detection, which includes an individual workstation monitoring system and a transportation system that navigates and facilitates the movement of a robotic mechanism.
• the robotic mechanism moves along a row of workstations of the ring spinning machine and eliminates a yam breakage and possibly other defects at the workstation, so that the activity of the workstation of the ring spinning machine is quickly resumed and occurrences of defective yams due to other spinning defects are also eliminated.
• Document DE4312026 discloses a method of distinguishing the operating state from the point of view of yam production at individual workstations by processing signals from a sensor arranged on an attending device of a ring spinning machine. In doing so, a distinction is made between the following three states: a) the yam is running in a certain position, i.e., the workstation works normally, there is no need for the intervention of the attending device b) at there is no yam running and no stationary yam the workstation, so the attending device must attempt to remove the yam break c) a stationary yam is present at the workstation, i.e., there is a fault that the attending device is unable to remove, so the workstation is marked as needing further servicing by another device or operator.
• the workstation is identified as being in need of attention when a yam break is registered, state (b), and also when the yam is present but not moving, state (c).
• the appropriate sensor identifies the yam state as running, broken or stationary, and if the yam break cannot be repaired, the spinning unit is marked as requiring further maintenance.
• the sensor signal is integrated after filtering according to the receiver frequency and the signal level is compared with a reference level. The reference levels are modified according to the speed of the attending device.
• state (b) where the attending device must attempt to repair the break, also includes some states which cannot be repaired by the attending device, such as missing material between the draw-off roller and the pressure roller of the drafting device.
• the sensor is expensive and the device for evaluating its signal is complex.
• the object of the present invention is to propose an attending device capable of accurately and reliably distinguish whether spinning can be resumed by the means of an attending device at the workstation of a spinning machine, especially a ring spinning machine, where spinning has been interrupted, or decide that the attending device will not make futile attempts to resume spinning and continue its movement along the workstations.
• an attending device comprising a supporting structure in which are arranged means for mounting displaceable on a ring spinning machine for producing yam and for moving along at least one row of workstations of the machine according to independent claim 1.
• the attending device further comprises service means for performing service operations at the working stations of the machine, the service operation being for instance a piecing operation, i. e. resuming spinning.
• a power supply and control system are arranged on/in the structure of the attending device.
• the attending device comprises a front side, a back side and two lateral sides.
• the front side is adapted to be arranged against the row of workstations of the ring spinning machine and is intended for the passage of the service means in order to perform a service operation at a workstation of the ring spinning machine.
• the attending device on the ring spinning machine is provided with a non-contact sensor of the profile of the surface of a rotating element, which has a sensing area directed in front of the front side of the attending device, the front side of the attending device being intended to be arranged against the machine (e. g. towards the workstation of the ring spinning machine), wherein the sensing area is adapted to sense the frontal profile of the rotating element of the spinning machine.
• the sensing area of the non-contact sensor of the profile of the surface of the rotating element is adapted to sense the frontal profile of a draw-off shaft of a drafting device of the workstation of the machine.
• the sensing area is arranged horizontally, wherein a plane interspersed with the sensing area passes through the axis of the sensed rotating element (e. g. rotation axis of the rotating element such as draw-off shaft of the drafting device) of the spinning machine, i.e., in the case of a ring spinning machine, through the axis of the draw-off shaft of the drafting device, which usually is arranged horizontally.
• the axis of the sensed rotating element e. g. rotation axis of the rotating element such as draw-off shaft of the drafting device
• the spinning machine i.e., in the case of a ring spinning machine
• the at least one contact sensor is mounted/arranged on the support structure of the attending device.
• the at least one non-contact sensor is, according to an embodiment of the invention, coupled or can be coupled to the control system.
• the non-contact sensor of the profile of the surface of the rotating element comprises, or is coupled to, or can be coupled to an evaluation system which is provided with means for identifying a fibre ribbon on a draw-off roller of the ring spinning machine in a position appropriate for resuming spinning, wherein these means are coupled to or can be coupled to the control system of the attending device for controlling the service means of the attending device to resume spinning at the workstation of the machine.
• the presence or absence of the ribbon of fibres on the draw-off roller is detected by the control system.
• the evaluation system is part of the noncontact sensor or is part of the control system of the attending device or is part of an external device.
• the noncontact sensor of the profile of the surface in the supporting structure of the attending device is arranged displaceable for moving the position of the sensing area.
• the non-contact sensor of the profile of the surface of a rotating element is formed by a laser sensor of the profile.
• a ring spinning machine for producing yam according to claim 9 which comprises at least one attending device according to any of the above-mentioned embodiments.
• the object of the invention is achieved by a method of using the attending device according to any of the above-mentioned embodiments for detecting the operating state at the workstation of the ring spinning machine, wherein the attending device stops in front of the workstation requiring operation after interruption of yam production according to claim 10.
• the object of the invention is also achieved by a method of using the attending device according to any of the above-mentioned embodiments to detect the operating state at the workstation of the ring spinning machine, wherein the attending device moves along the row of workstations of the machine according to claim 11 .
• the shape of the frontal profile of the rotating element of the ring spinning machine is sensed, preferably in a horizontal direction.
• the rotating element is a draw-off roller of a drafting device of the ring spinning machine.
• Fig. 1 shows a ring spinning machine
• Fig. 2. shows a cross-section of a workstation of the ring spinning machine in the presence of an attending device
• Fig.3 shows a view of the suction of a fibre ribbon into a suction nozzle after the interruption of spinning at the workstation
• Fig. 4 shows a view of a sensing area with a draw-off shaft and a section through the fibre ribbon
• Fig. 5 shows a detail of a draw-off roller and the suction of the fibre ribbon after a break occurs and of the sensing area
• Fig. 6 shows a detail of the draw-off roller and the sensing area during spinning
• Fig. 7 shows an overview of operationally favourable, unfavourable and fault states on the draw-off shaft sensed by a non-contact sensor, including various types of laps on the draw-off shaft and draw-off rollers of the drafting device of the machine.
• An attending device 1 is adapted and intended to be mounted displaceable along a row of workstations 2 of a textile spinning machine for producing yarn and comprises a supporting structure in which are mounted means 11 for displaceable mounting on the spinning machine and for moving along the row of workstations 2 of this machine. It further comprises service means SM for performing service operations at the workstations 2 of the spinning machine for which the attending device 1 is intended.
• Each workstation 2 of the spinning machine comprises means for producing yam.
• Several attending devices 1 for example two, may be mounted on the spinning machine, as shown in Fig. 1.
• the textile spinning machine for which the attending device 1 is intended is a ring spinning machine and it is for this type of machine that it will be described further, wherein the arrangement of the attending device will be similar for other types of spinning machines, such as air-jet or rotor spinning machines.
• each workstation 2 of the ring spinning machine comprises means for producing yarn which comprise a roving bobbin 20 from which the roving 201 is drawn off to a drafting device 21 by which it is refined into a ribbon 202 of fibrous material which is further guided through a guiding eyelet 22 and over a traveller 23 to a rotating tube 24 on which it is wound already in the form of yam 203 with a twist which is formed between the outlet of the drafting device 21 and the traveller 23 as a result of the movement of the traveller 23 on the ring 25 caused by the rotational movement of the tube 24 during the winding of the yam 203.
• the yam 203 passes through a balloon separator 26.
• the ring 25 and the balloon separator 26 are mounted on a ring plate 27 which is vertically reciprocally movable.
• the tube 24 is mounted on a drive mandrel 2, which is mounted rotationally on the frame of the machine and coupled to a drive by some of the known methods.
• the yam 203 is distributed across the tube 24 by the movement of the ring plate 27 and its package together with the tube 24 forms the so-called cop 240.
• a travelling track 29 for the attending device 1 is created in a suitable place which, in the illustrated exemplary embodiment, includes a travelling rail 290 and a stabilizing rail 291.
• the attending device 1 intended for the ring spinning machine, comprises a control unit 10 which is coupled to means 11 for mounting and for moving the attending device 1 along the travelling track 29 along the row of workstations 2_of the machine with the possibility of stopping at a workstation 2 requiring service.
• the attending device 1 further comprises service means SM for resuming spinning at the workstation 2 of the ring spinning machine for which the attending device 1 is intended.
• each workstation 2 of the ring spinning machine For yam spinning on the ring spinning machine, at each workstation 2 of the ring spinning machine, from the roving bobbin 20, is drawn off the roving 201 which is guided to the drafting device 21 in which the roving 201 is refined by drafting, and its fibres are parallelized to form a fibre ribbon 202 which, after passing through the drafting device 21, is transformed by twisting into yam 203.
• the draw-off roller 211 of each workstation 2 of the ring spinning machine is arranged on a continuous draw-off shaft 210 which is common to all the identical workstations 2 of the machine arranged next to each other.
• each workstation 2 is provided with means for monitoring the state of its operation.
• the information about the workstation 2 where a break occurred is transmitted to a control system CS of the attending device 1 installed on the machine and the attending device 1 moves to the machine workstation 2 which requires service.
• the attending device 1 is ready to resume spinning at the workstation 2 by means of its service means SM which comprise means for resuming spinning at the workstation 2 of the ring spinning machine.
• the attending device 2 resumes spinning by its service means SM at the respective workstation 2 of the ring spinning machine and is ready to continue its operation in attending the other workstations 2.
• the attending device 2 normally has a predetermined number of attempts and, if the last attempt is not successful, issues a signal to call the operator or marks the workstation 2 as a workstation 2 that cannot be automatically serviced.
• the continuous draw-off shaft 210 on which the draw-off rollers 211 , which usually have a larger diameter than the continuous draw-off shaft 210, are arranged at each workstation 2 of the ring spinning machine, continuously rotates during the operation of the ring spinning machine, so that if, for example, after a yam break at the workstation 2, it is not possible to suck the fibre ribbon 202 into the suction nozzle 2110 behind the respective draw-off roller 211 , the fibres are lapped on the draw-off roller 211 , and/or on the thinner part of the draw-off shaft 210 adjacent thereto.
• the fibre lapping on the draw-off roller 211 and/or on the thinner part of the draw-off shaft 210 adjacent thereto also occurs during spinning, when a portion of the fibres deviates from the processed fibre ribbon 202 and gradually forms fibre lapping on the draw-off roller 211 and/or on the thinner part of the draw-off shaft 210 adjacent thereto.
• the yarn 203 breaks after a certain time, wherein the fibre ribbon 202 has not been sucked into the suction nozzle 2110, and therefore spinning at the workstation 2 cannot be automatically resumed by the service means SM of the attending device 2.
• the draw-off rollers have the same diameter as the remainder of the draw-off shaft.
• the attending device 1 In order to detect the operating state at the workstation 2 at which the yarn 203 break has occurred and in front of which the attending device 1 has been stopped, the attending device 1 is provided with at least one non-contact sensor 12 of the profile of the surface of the rotating element, which has a sensing area SA which is directed outside the ground plan of the attending device 1. and is adapted to transmit the sensed data about the profile or is coupled to means for transmitting the data about the sensed profile or it can be coupled to the means for transmitting the data about the sensed profile.
• the sensing area is planar.
• the sensing area SA is directed in front of the front side of the attending device 1 which is intended to be arranged against the machine and is adapted to sense the frontal profile of the rotating element of the spinning machine on which the attending device 1 is installed.
• the rotating element On the ring spinning machine, the rotating element is the draw-off shaft 210 with the draw-off rollers 211 of the drafting device 21 of the workstation 2.
• the non-contact sensor 12 of the profile of the surface of the rotating element is formed in a specific embodiment by a profile laser sensor which is coupled to the control system CS of the attending device 1.
• the control system CS contains information about the initial shape of the draw-off shaft 210 in the sensing plane including all draw-off rollers 211 and information about the expected width of the fibre ribbon 202 and the area of the surface of the draw-off roller 211 in which the fibre ribbon 202 moves, wherein at the same time it contains information about the desired position of the fibre ribbon 202 on the draw-off roller 211 allowing spinning to be resumed at the workstation 2 by means of the service means SM of the attending device 1.
• control system of the machine contains the above-mentioned information, wherein the control system of the machine is coupled to the control system CS of the attending device through electronic data communication.
• the non-contact sensor 12 of the profile of the surface of the rotating element has two modes of operation on the attending device 1.
• the first is the sensing of the draw-off roller 211 and possibly also the adjacent parts of the drawoff shaft 210 after stopping at the workstation 2 of the ring spinning machine on which the attending device 1 is installed.
• the second mode of operation of the non-contact sensor 12 is the sensing of the surface of the draw-off roller 211 and the adjacent parts of the draw-off shaft 210 as the attending device 1 travels along the row of workstations 2 of the ring spinning machine on which the attending device 1 is installed.
• the non-contact sensor 12 is provided with a radiation source 121 and a receiver 122 of reflected radiation.
• the radiation emitted by the radiation source 121 creates a sensing area SA, which, when the attending device 1 is installed on the ring spinning machine, is arranged horizontally against the frontal profile of the draw-off shaft 210 with the draw-off rollers 211.
• the radiation receiver 122 is located in the non-contact sensor 12 lower than the radiation source 121 so that the reflected radiation creates a reflex area RA which forms an acute angle with the sensing area SA which is determined by the design of the non-contact sensor 12.
• the non-contact sensor 12 of the profile of the surface of the rotating element comprises or is coupled or can be coupled to an evaluation system ES which is provided with means for identifying the presence of the fibre ribbon 202 on the draw-off roller 211 of the drafting device 21 of the workstation 2 of the ring spinning machine, wherein these means for identification are coupled or can be coupled to the power supply system and the control system CS of the attending device 1, which, among other things, is used to control the service SM of the attending device 1. to resume spinning at the workstation 2_of the machine.
• an evaluation system ES which is provided with means for identifying the presence of the fibre ribbon 202 on the draw-off roller 211 of the drafting device 21 of the workstation 2 of the ring spinning machine, wherein these means for identification are coupled or can be coupled to the power supply system and the control system CS of the attending device 1, which, among other things, is used to control the service SM of the attending device 1. to resume spinning at the workstation 2_of the machine.
• the evaluation system ES of the attending device 1 is either part of the non-contact sensor 12, or it is part of the control system of the attending device 1, or it is part of the control system 3 of the ring spinning machine.
• the sensing area SA extends to a width which, when the attending device 1 has been stopped in front of the workstation 2 of the ring spinning machine, is wider than the width of the draw-off roller 211 at the point of radiation incidence in the sensing area SA on the surface of the draw-off roller 211 of the respective workstation 2, so that the radiation in the sensing area SA is also incident on the thinner part of the drawoff shaft 210 on both sides of the draw-off roller 211.
• the reflection of the radiation from the surface of the draw-off roller 211 and from the thinner part of the draw-off shaft 210 forms a reflex area RA and is sensed by the receiver 122 of the non-contact sensor 12, and information about the distances of the individual points of the sensed area SA of the draw-off roller 211 and of the drawoff shaft 210 from the sensor is transmitted to the control system CS of the attending device 1, so that the control system CS of the attending device 1 is able to detect deviations of the sensed profile of the draw-off shaft 211 from the stored information about the desired profile of the draw-off roller 211 and of the adjacent thinner parts of the draw-off shaft 210 at the respective workstation 2.
• control system CS is able to evaluate any deviation from the initial shape of the draw-off shaft 210, i.e. , it is able to evaluate both the presence of the fibre ribbon 202 between the draw-off roller 211 of the respective workstation 2_of the machine and the suction nozzle 2110 of the same workstation 2_of the machine, as well as other deviations from the initial shape of the draw-off shaft 210 that is, possible laps of fibres on the draw-off roller 211 or on the draw-off shaft 210, as will be described further.
• the above-described width of the sensing area S at the point of radiation incidence on the draw-off roller 211 does not exceed the width of the draw-off roller 211 , but it is sufficient if it is at least the same as the assumed width of the fibre ribbon 202 and the area of the surface of the draw-off roller 211 in which the ribbon 202 of roving fibres moves on the surface of the draw-off roller 211 during spinning.
• the attending device 1 is intended to attend the ring spinning machine and is provided with means for its moving along a row of workstations 2 and to stop at the workstation 2, at which spinning has been interrupted. After stopping at the workstation 2 at which spinning is interrupted, the attending device 1 first determines whether the conditions for resuming spinning by the service means SM of the attending device are met at the workstation 2, that is, whether the fibre ribbon 202 is present on the draw-off roller 211 , or between the draw-off roller 211 and the suction nozzle 2110, in a position allowing the resumption of spinning at the respective workstation 2.
• the control system CS of the attending device 1 activates the non-contact sensor 12 of the profile of the surface, from the signals of which, after processing, it determines, whether the ribbon 202 of fibres is present on the draw-off roller 211 in a position allowing the service means SM of the attending device 1 to resume spinning at the workstation. If the ribbon 202 of fibres is present in the corresponding position on the draw-off roller 211 of the workstation 2 at which spinning has been interrupted and where the attending device has stopped, the control system CS of the attending device 1 issues instructions to its service means SM to resume spinning.
• control system CS of the attending device 1 is replaced or supplemented for this function by the control system 3 of the machine, on which the attending device 1 is installed.
• the control system CS of the attending device 1 issues a command to call the operator, or to mark the workstation 2 as a workstation 2 that cannot be automatically serviced, since spinning cannot be resumed by the service means SM of the attending device
• the attending device 1 In order to speed up the operator's activity, it is advisable for the attending device 1 to evaluate information about the reasons why it is not possible to resume spinning automatically at the subject workstation 2 by the service means SM of the attending device and passes the information to the operator.
• the attending device 1 senses by the non-contact sensor 12 the profile of the surface of the draw-off shaft 210 on the row of identical workstations 2 arranged next to each other and its control system CS or the control system 3 of the machine compares the profile of the surface of the draw-off shaft 211 with the preset initial shape of the profile of the surface and, from this comparison, determines the occurrence of an operationally favourable or unfavourable state or fault state at a specific workstation 2.
• An operationally favourable state is understood to be a state of spinning during which the non-contact sensor 12 transmits information about the presence of yarn 203 in the sensing area SA in front of the surface of the draw-off roller 211 of the respective workstation 2, which is the space of the workstation 2 through which the yarn 203 passes during spinning.
• An operationally unfavourable state is understood to be a state where the workstation 2 is not spinning, but the conditions at the workstation 2_are suitable for resuming spinning by the service means SM of the attending device 1, that is, a state where the non-contact sensor 12 transmits information about the presence of a fibre ribbon 202 on the draw-off roller 211 and between the drawoff roller 211 and the suction nozzle 2110 in a position allowing the service means SM of the attending device 1 to resume spinning at that workstation 2.
• a fault state is understood to be a state where the workstation 2 is not spinning, but the conditions at the workstation 2 are not suitable for resuming spinning by the service means SM of the attending device 1, that is, the state when the non-contact sensor 12 transmits information on the absence of the ribbon 202 on the draw-off roller 211 in a position suitable for resuming spinning by the service means SM of the attending device 1 and/or about the fibre lapping 204 on the active surface of the draw-off roller 211 and it is necessary to call the operator to manually remove the fault.
• laps 204 of fibres on the draw-off shaft 210 are represented by laps 204 of fibres on the draw-off shaft 210, either in the area of the draw-off roller 211 of the respective workstation 2, or on the draw-off shaft 210 in the area between the draw-off rollers 211.
• laps are created either by winding the ribbon 202 of fibres which has not been sucked into the suction nozzle 2110 after spinning is interrupted, or by the gradual lapping of fibres released from the ribbon 202 of fibres during spinning.
• FIG. 7 Examples of operationally favourable, operationally unfavourable and fault states at the workstations 2 are schematically represented in Fig. 7.
• the monitoring of the operating state at the workstation 2 takes place, as described above, in a horizontal plane passing through the front side of the draw-off shaft 210.
• examples of operating states are shown in a 45° upwardly rotated position, so that the textile material, whether yam 203, ribbon 202 or lapping 204 is displayed above or on top of the surface profile of the drawoff roller 211 and/or the draw-off shaft 210.
• Detected operating state are shown in Fig. 7 marked with letters A to H and will be described below.
• Operating state A represents the spinning state of the yam 203, where the yam 203 has a diameter corresponding to the diameter of the spun yam and is situated outside the surface of the draw-off roller 211 of the respective workstation 2.
• the same operating state is also shown in Fig. 6 in a side view.
• the attending device 1 passes by the workstation 2 which has operating state A, the attending device 1 does not stop and can transmit information that spinning is in progress at the workstation 2.
• operating state D which is the spinning state of the yam 203 in a position during spinning as in operating state A, but lapping 204 is formed on the draw-off roller 211 next to the yam 203, wherein there is a high probability of interruption of spinning at the respective workstation 2 within a short time.
• the operator can be informed by the attending device of the danger of a break at the workstation 2 and, if the operator notes operating state D of the workstation 2, he will not return to it in the event of a subsequent break, since such a subsequent break represents a fault state which cannot be eliminated by the service means SM of the attending device 1.
• Operating state B represents a state where the workstation 2 is not spinning, but the fibre ribbon 202 is situated on the draw-off roller 211 , on which there are no other fibres next to it.
• the information that the workstation 2 is not spinning is obtained by the attending device 1 from the control system of the machine and, having obtained this information, the attending device 1 travels to the workstation 2 to resume spinning.
• the non-contact sensor 12 After stopping in front of the workstation 2 requiring servicing, the non-contact sensor 12 is actuated and, if it detects that the ribbon 202 is situated on the draw-off roller 211 and between the draw-off roller 211 and the suction nozzle 2110, in a position allowing to resume spinning at the workstation 2 by the service means SM of the attending device, which represents operating state B, the attending device 1 actuates the service means SM and makes an attempt to resume spinning.
• the attending device 1 finds that the workstation 2 it is currently passing by is in operating state B, it may stop at that workstation and make an attempt to resume spinning or proceed to the workstation 2 it is currently approaching to determine its operating state and, if possible, resume spinning by its service means SM.
• the remaining operating states shown represent fault states.
• Operating state C represents a fault state where the workstation 2 is not spinning and there is neither a ribbon 202 nor other fibrous material on the draw- off roller 211. The reason for this state is missing material and repair requires operator intervention.
• Operating state E represents a fault state that can develop from the abovedescribed operating state D after a yam 203 break.
• the workstation 2 is not spinning, and although there is a fibre ribbon 202 on the draw-off roller 211 , there is fibre lapping 204 next to it on the edge of the draw-off roller 211 , which prevents the service means SM of the attending device 1 from resuming spinning and requires operator intervention.
• Operating state F represents a fault state where the workstation 2 is not spinning and fibre lapping 204 is formed across the entire width of the draw-off roller 211.
• Operating state G represents a fault state where the workstation 2 is not spinning and fibre lapping 204 is formed on the draw-off roller 211, which extends beyond the active surface of the draw-off roller 211.
• Operating state H represents another fault condition where the workstation is not spinning, and although there is a fibre ribbon 202 on the draw-off roller, there are adjacent fibre laps 204 on either side, one of which extends beyond the active surface of the draw-off roller 211 , which prevents the service means SM of the attending device 1 from resuming spinning and requires operator intervention.
• Fault operating states C, E, F, G, H and any other unillustrated operating states represent information on the basis of which statistical assessment can be made, for example, on the quality of the material being spun, wear of the parts of the workstation used to spin-in the yarn, etc.
• the non-contact sensor 12 of the profile of the surface in the support structure of the attending device 1 is arranged displaceable to relocate the sensing area SA. This allows, for example in a ring spinning machine, to monitor the possible fibre lapping also on the pressure roller 212 of the drafting device 21.
• the invention can be applied to ring, rotor or air-jet spinning machines for producing yam which are equipped with a movable attending device for resuming the spinning of broken yarn, for detecting the operating state of the rotating elements at the workstations and for detecting the occurrence of unwanted laps of fibres, yarn or roving on the rotating elements of the workstations of the respective machine.
• 11 means for mounting the attending device on the ring spinning machine and for moving it along the row of workstations of the machine

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• Engineering & Computer Science (AREA)
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• Textile Engineering (AREA)
• Spinning Or Twisting Of Yarns (AREA)

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Citations (8)

• 2023
  • 2023-05-31 CZ CZ2023-220A patent/CZ2023220A3/cs unknown
• 2024
  • 2024-05-30 WO PCT/EP2024/064871 patent/WO2024246185A1/en active Pending

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