Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
  • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
  • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
  • B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
  • B65H63/06—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to presence of irregularities in running material, e.g. for severing the material at irregularities ; Control of the correct working of the yarn cleaner
  • B65H63/062—Electronic slub detector
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2701/00—Handled material; Storage means
  • B65H2701/30—Handled filamentary material
  • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

• the invention relates to a method for monitoring yarn at a workstation of a textile machine having a row of workstations arranged next to each other, where each workstation comprises a system of working nodes to transform fibers into yarn, and in which the yarn being produced is during its production monitored by a yarn quality sensor, yarn defects are detected, the quality of yarn is evaluated and the data is transmitted to the control device, which controls processes at the workstation.
• the yarn being produced is monitored at a workstation of a textile machine by a yarn quality sensor, which is connected to a control device of a workstation and/or of a group (section) of the workstations and/or of the machine.
• the yarn quality sensor is largely an autonomous device, preset to monitor specific desired yarn characteristics, so it monitors the yarn, evaluates its characteristics and sends the data about the results to the control device.
• the control device is then provided with means for making decisions about the steps which follow in the event of finding a yarn defect at the workstation.
• yarn defects are detected by the yarn quality sensor which has set so-called cleaning limits or the so-called cleaning curve.
• a typical case like this is the production of fancy yarns during which the parameters of the yarn being spun out are intentionally changed at the workstation in time, i.e., along the length of the yarn, so that these changes will cause the desired change in the yarn parameters.
• the so-called “fancy quality” of the yarn manifests itself in the intentional unevenness of the yarn appearance, such as local thick spots, local thin spots, local changes in the number of yarn twists, etc., which influences the yarn appearance, etc.
• the occurrence of these "events” in the yarn is detected by the yarn quality sensor.
• yarn faults even in the case of these fancy yarns it is necessary to detect the occurrence of undesired phenomena, which are afterwards evaluated as faults or lowered quality of the yarn, hereinafter denoted by the general term yarn faults.
• Another problem in the production of yarns is the occurrence of numerous states which affect the detected yarn parameters and which, moreover, in spite of exceeding the cleaning limits or the cleaning curve, cannot be considered as defects, since in terms of the whole workstation the state in question is classified as a deliberately selected state or change in the state.
• An example of this is typically the addition of liquid additives to the yarn in an air-jet spinning machine during spinning of some types of artificial fibers.
• the supplied liquid is a technological necessity and during the yarn production and detection of its quality it manifests itself in the yarn, for example, by reducing the "hairiness" of yarn, by changing the detected yarn diameter, etc.
• Another problem situation to which current yarn quality sensors are unable to respond adequately is, for example, a change in the speed of the yarn being produced, which does not necessarily be reflected on the change in the yarn thickness or other parameters, but it has a significant influence on the evaluation of yarn faults, especially of those in which also the length of the fault must be assessed.
• US 2016/145067 is known device which is capable of cleaning yarn by means of data determined by a capacitive sensor, which does not affect the parameters of the produced yarn and is only used to track the produced yarns and control the yarn cleaner, which controls yarn coupling device - splicer. US 2016/145067 requires the capacitive sensor and control unit transmits only data about yarn length and yarn velocity to the yarn cleaner.
• a common disadvantage of the background art is therefore the limited ability of the yarn quality sensor to react flexibly to different changes in the conditions during the production of yarns at the workstation.
• the aim of the invention is to eliminate or at least minimize the drawbacks of the background art, especially improve the detection of yarn in terms of changes of the working states at the workstation of the machine.
• the aim of the invention is achieved by a method for monitoring yarn at a workstation of a textile machine whose principle consists in that during stable yarn production the control device changes current operating conditions of the workstation and transmits to the yarn quality sensor online and in real-time information about the changes of the current operating conditions of the workstation, the yarn quality sensor accordingly adjusts in real-time its processes of monitoring the yarn and its evaluating the yarn parameters and sends the results for controlling the workstation.
• the invention also relates to a textile machine with a device for monitoring yarn at a workstation, whose principle consists in that the yarn quality sensor and the control device are interconnected by a means for online and real-time bidirectional transmission of the information about changes of the current operating conditions of the workstation and about the parameters of the yarn being produced, the yarn quality sensor being provided with means for online adjustment of the processes of monitoring and evaluating the yarn parameters in real-time and the control device being provided with means for changing current operating conditions of the workstation during stable yarn production.
• the invention is schematically illustrated in the drawing, which shows online and real-time bidirectional interconnection of the yarn quality sensor and the control device (of the workstation, of the section, of the machine).
• the individual nodes 1 to 7 of the workstation are connected to a control device 8, i.e., either to the control device of the workstation and/or to the control device of a group of the workstations, the so-called section, and/or are connected to the control device of the textile machine.
• a yarn quality sensor 9 is arranged between the outlet of the yarn 3 from the spinning unit 2 and the traversing device 6 of yarn on the bobbin 5 .
• the yarn quality sensor 9 is usually arranged between the outlet of the yarn 3 from the spinning unit 2 and the drawing-off mechanism 4 of yarn from the spinning unit 2, whereas between the drawing-off mechanism 4 of yarn from the spinning unit 2 and the winding device of yarn on a bobbin 5 is usually arranged a sensor 10 of the yarn 3 presence, which enables to detect a yarn 3 break in this area.
• the yarn quality sensor 9 and, optionally, the sensor 10 of the yarn presence is connected to the control device 8 (of the workstation, of the section, of the machine), which is equipped with software for making decisions about the operations at the workstation in case that undesirable state of the yarn 3 at the workstation is detected by the respective sensor 9 , 10.
• the control device 8 issues instructions to start necessary activities at the workstation to eliminate the undesirable state.
• the yarn quality sensor 9 and the control device 8 assigned to it are interconnected with the aid of a means 11 for bidirectional online communication in real-time.
• this means for bidirectional online communication in real-time is provided as a means for transmitting two-state information.
• the real-time bidirectional online communication means 11 is implemented as a means for transmitting analog information.
• the real-time bidirectional online communication means 11 is realized as a data communication means.
• the real-time bidirectional online communication means 11 is implemented using simultaneously several methods, either by multiplying the communication means or by transmitting one type of information by one communication means and by transmitting a different type of information by another communication means.
• the yarn quality sensor 9 at the workstation for the implementation of the present invention is connected by the real-time bidirectional online communication means 11 with the control device 8 of the workstation and/or the control device of the section of the workstations and/or the control device of the textile machine.
• the evaluation of the quality of the yarn 3 with intentional irregularities and detecting faults in this yarn 3 is then performed in such a manner that the yarn 3 is monitored by the yarn quality sensor 9 and the detected values of the yarn 3 parameters are evaluated and on the basis of the decision-making process it is determined whether the respective section of the yarn 3 is considered faulty or not. It is important to note that intentional irregularities of the yarn 3 during this decision-making process are not considered a fault, whereas unintentional unevenness of the yarn 3 or unintentional changes in a yarn 3 parameter are classified as defective.
• the control device 8 (of the workstation, of the section, of the machine) according to the invention transmits to the yarn quality sensor 9 online in real-time information about the yarn 3 parameters being currently deliberately changed in the specific sections of the yarn 3 length (the information about operating parameters of the respective working nodes 1 to 7 of the workstation being currently deliberately changed), and so the sensor 9 "knows" when the intentional unevenness of the yarn 3 (the beginning of the unevenness) will enter the measuring zone, and, if necessary, it even "knows” what parameters this intentional unevenness of the yarn 3 should have, or it even “knows” when this intentional unevenness of the yarn 3 will end.
• the yarn quality sensor 9 behaves essentially in three ways on the basis of this received information at the time when the yarn 3 with deliberately generated irregularities passes through the measuring zone of the sensor 9.
• the yarn 3 when monitoring the quality of uniform yarn 3 on an airjet textile machine, in which auxiliary liquid is fed in the process of yarn 3 formation, typically water or a mixture of water base or another liquid, during the standard yarn 3 production, the yarn 3 exhibits certain parameters, including the fact that it contains said liquid. In terms of the detected yarn 3 parameters, this influences, for example, the hairiness of the yarn 3. However, if the detected yarn 3 hairiness changes, this may not necessarily mean a liquid supply error, since it may be also caused by other errors. The determination of whether or not there is a liquid supply error can be done due to this invention completely automatically.
• control system 8 gives a signal to the liquid supply system, which is also one of other working nodes 7 at the workstation, namely the signal to increase the liquid supply.
• control system 8 sends to the yarn quality sensor 9 online and in real-time the information about the change of the liquid supply and the yarn quality sensor 9 gets ready for monitoring yarn 3 with a larger amount of the liquid and sends to the control device 8 the detected yarn 3 parameters without a liquid or with less liquid.
• this invention allows adaptive sensing of the yarn 3 parameters, always based on the current conditions at the workstation or on the current setting of the working nodes 1 to 7 at the workstation.
• the invention is not limited only to the embodiments specifically described herein, since the principle of the invention, which consists in implementing real-time bidirectional online communication between the yarn quality sensor 9 and the control device 8 and transmitting information about ongoing processes or their changes in order to improve and simplify the detection of different yarn 3 states under different conditions at the workstation, can be implemented in a wide range of textile machines and methods of yarn 3 production or yarn 3 modification.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Quality & Reliability (AREA)
• Mechanical Engineering (AREA)
• Spinning Or Twisting Of Yarns (AREA)
• Looms (AREA)
• Filamentary Materials, Packages, And Safety Devices Therefor (AREA)

Applications Claiming Priority (1)

Publications (2)

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Family Applications (1)

Country Status (4)

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• 2016
  • 2016-09-29 CZ CZ2016-607A patent/CZ307261B6/cs not_active IP Right Cessation
• 2017
  • 2017-09-27 EP EP17193448.2A patent/EP3301209B1/en active Active
  • 2017-09-28 JP JP2017188764A patent/JP2018052743A/ja active Pending
  • 2017-09-29 CN CN201710907578.9A patent/CN107879190B/zh active Active

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