• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a yarn monitoring device comprising an optical detection section (50) of the thickness of a yarn and a correction section (62). optical detection section (50) of the thickness of a yarn is adapted to detect a yarn thickness of a moving yarn. The correction section (62) confirms the yarn thickness detected by the optical yarn thickness sensing section (50) and performs a first correction to correct the yarn thickness when the confirmed yarn thickness satisfies a predetermined increase condition, in a first predetermined period. Further, the correction section (62) confirms the yarn thickness detected by the optical yarn thickness sensing section (50) and performs a second correction to correct the yarn thickness when the confirmed yarn thickness satisfies a predetermined reduction condition. , in a second predetermined period different from the first predetermined period. The invention also relates to a winding machine.
    公开号:CH712075B1
    申请号:CH00056/17
    申请日:2017-01-17
    公开日:2021-06-15
    发明作者:Kawabata Satoshi；Nakade Kazuhiko
    申请人:Murata Machinery Ltd；
    IPC主号:
    专利说明:

    1. Field of the invention
    [0001] The present invention mainly relates to a yarn monitoring device adapted to monitor a yarn in motion.
    2. Description of the known art
    Conventionally, a yarn winding machine, such as a spinning machine, an automatic winder and the like, includes an optical yarn monitoring device adapted to monitor a yarn being wound. The yarn monitoring device radiates light from a moving yarn and receives a transmitted light that has been transmitted through the yarn or a reflected light that has been reflected from the yarn with a light-receiving element such as a photodiode to monitor a thickness of yarn and similar in real time and detect a yarn defect (portion with an anomaly in the yarn quality).
    [0003] JP2000-327226A and JP2007-131974A disclose this type of optical yarn monitoring device.
    [0004] During the winding of the yarn, a temperature of the yarn monitor may be lowered when an air flow is generated as a result of the movement of the yarn, or the temperature of the yarn monitor may increase when it is generated a frictional heat as a result of the movement of the yarn. A light-projecting element and a light-receiving element are affected by this temperature variation and, therefore, their properties (amount of light that will be projected, current that will be emitted and the like) change. In this regard, JP2000-327226A and JP2007-131974A disclose a process for correcting an output signal and the like of the light receiving element in consideration of the temperature variation during the movement of the yarn. However, in JP2000-327226A and JP2007-131974A the timing for performing such correction is not described in detail.
    BRIEF SUMMARY OF THE INVENTION
    The present invention has been made in consideration of the above circumstances, and its main objective is to provide a yarn monitoring device, a yarn winding machine and an automatic winder that perform a correction process of a thickness of a yarn with an appropriate timing in consideration of a change in temperature during the movement of the yarn.
    The problems that the present invention intends to solve are described above and the means and effects for solving such problems will now be described.
    According to a first aspect of the present invention, a yarn monitoring device having the following configuration is provided. Specifically, the yarn monitoring device comprises an optical yarn thickness detection section and a correction section. The yarn thickness sensing section is adapted to detect a yarn thickness of a moving yarn. The correction section performs a first confirmation process comprising a step of confirming the yarn thickness detected by the yarn thickness detection section, and performs a first correction comprising a step of correcting the yarn thickness when the yarn thickness confirmed in the first confirmation process satisfies a predetermined increase condition, in a first predetermined period which is a first period of time or a first length traveled by the yarn. Further, the correction section performs a second confirmation process comprising a step of confirming the yarn thickness detected by the yarn thickness detection section, and performs a second correction comprising a step of correcting the yarn thickness when the yarn thickness confirmed in the second confirmation process satisfies a predetermined reduction condition, in a second predetermined period which is a second period of time or a second length traveled by the yarn, different from the first predetermined period.
    Therefore, since the behavior in the variation of the yarn thickness differs between when the yarn thickness is increased and when the yarn thickness is reduced, the period corresponding to each case is set so that the yarn thickness can be corrected with an appropriate timing corresponding to the change in yarn thickness, while taking into account the change in temperature during the movement of the yarn.
    In embodiments of the yarn monitoring device, the first period of time or length traveled is shorter than the second period.
    Therefore, when the yarn thickness is increased, the yarn thickness can change rapidly, and therefore it is necessary that the period be set short to perform the correction frequently. On the other hand, when the yarn thickness is reduced, the yarn thickness varies gradually. However, the detection value of the yarn thickness detection section (i.e., the detected yarn thickness) also varies gradually due to the influence of the temperature change. Therefore, when the yarn thickness is small, it is necessary that the period be set long to distinguish whether the yarn thickness is actually reduced or the yarn thickness appears to be reduced due to the influence of the temperature change. As the yarn thickness is increased, the actual yarn thickness substantially varies rapidly, but the detection value of the yarn thickness detection section for the influence of the temperature change varies relatively gradually, as described above. Therefore, whether the yarn thickness has actually increased or whether the yarn thickness appears to have increased due to the influence of the temperature change can be easily distinguished (in a short time). Therefore, the yarn thickness can be corrected with an appropriate timing corresponding to the variation of the yarn thickness.
    In embodiments, the yarn monitoring device described above has the following configuration. Specifically, the yarn monitoring device comprises a yarn movement length detecting section adapted to detect a yarn movement length which is a length that the yarn has traveled. The correction section, based on the yarn movement length detected by the yarn movement length detection section, performs the first confirmation process and determines if the yarn thickness confirmed in the first confirmation process satisfies the predetermined increase condition each time the yarn travels a first predetermined length, and performs the second confirmation process and determines whether the yarn thickness confirmed in the second confirmation process satisfies the predetermined reduction condition each time the yarn travels a second predetermined length.
    Thus, the correction timing is determined based on the yarn movement length, so that the yarn thickness can be corrected more accurately than in the case where the correction timing is determined based on time .
    In embodiments of the yarn monitoring device described above, the correction section performs the first confirmation process and determines whether the yarn thickness confirmed in the first confirmation process satisfies the predetermined increase condition each time it has elapsed. a first predetermined time, and performs the second confirmation process and determines whether the yarn thickness confirmed in the second confirmation process satisfies the predetermined reduction condition each time a second predetermined time has elapsed.
    Thus, the correction timing can be determined without detecting the length of movement of the yarn, whereby the process can be simplified.
    In embodiments of the yarn monitoring device described above, the correction section obtains, as the reference yarn thickness, a value based on an average of the yarn thicknesses from the start of the yarn movement to when the yarn has traveled a predetermined length or when a predetermined time has elapsed, and performs the first correction based on an increased amount of yarn thickness starting from the reference yarn thickness, and performs the second correction based on a reduced amount of thickness of yarn starting from the reference thickness of the yarn.
    [0016] Therefore, it is assumed that the influence of the temperature variation is small for a predetermined time from the start of the yarn movement and, therefore, the influence of the temperature variation and the like can be accurately estimated by taking the mean as a reference (reference yarn thickness) of the yarn thicknesses acquired during this time. Therefore, the yarn thickness can be corrected more accurately.
    Further, in embodiments of the yarn monitoring device described above, the correction section performs the first correction based on a correction amount obtained by adding a first predetermined fixed value, defined in advance for each first period, to an initial adjustment value defined prior to the start of yarn movement, and performs the second correction based on a correction amount obtained by subtracting a second predetermined fixed value defined in advance for each second period from the initial adjustment value.
    In embodiments of the yarn monitoring device described above, the first correction is performed when a yarn thickness at a termination time instant of a first confirmed current period in the first confirmation process is increased by a predetermined amount to starting from a yarn thickness at a time instant of termination of a first preceding period, and the second correction is preferably performed when a yarn thickness of a second current period confirmed in the second confirmation process is continuously reduced.
    In embodiments of the yarn monitoring device described above, the correction section calculates an average of yarn thicknesses in a predetermined length or a previous predetermined time, and performs the first correction to correct the yarn thickness when the average of the yarn thicknesses at the time instant of termination of the first current period satisfies the predetermined increase condition.
    According to a second aspect of the invention, a yarn winding machine having the following configuration is provided. Specifically, the yarn winding machine comprises a winding section, a yarn thickness detection section and a correction section. The winding section is adapted to wind a yarn to form a cone. The yarn thickness sensing section is adapted to detect a yarn thickness of a moving yarn. The correction section performs a first confirmation process comprising a step of confirming the yarn thickness detected by the yarn thickness detection section, and performs a first correction comprising a step of correcting the yarn thickness when the yarn thickness confirmed in the first confirmation process satisfies a predetermined increase condition, in a first predetermined period of time or length traveled by the yarn, and performs a second confirmation process comprising a step of confirming the yarn thickness detected by the yarn thickness detection section , and performs a second correction comprising a step of correcting the yarn thickness when the yarn thickness confirmed in the second confirmation process satisfies a predetermined reduction condition, in a second predetermined period of time or length traveled by the yarn, different from the first predetermined period.
    Therefore, since the behavior in the variation of the yarn thickness differs between when the yarn thickness is increased and when the yarn thickness is reduced, the period corresponding to each case is set so that the yarn thickness can be corrected with an appropriate timing corresponding to the variation of the yarn thickness.
    [0022] In embodiments, the yarn winding machine described above can operate as an automatic winder and has the following configuration. Specifically, the yarn winding machine usable as an automatic winder comprises a section for detecting the length of movement of the yarn adapted to detect a length of movement of the yarn which is a length that the yarn has traveled. The winding section winds the yarn while varying a winding speed, at least temporarily. The correction section performs the first confirmation process and determines whether the yarn thickness confirmed in the first confirmation process satisfies the predetermined increase condition each time the yarn travels a first predetermined length, and performs the second confirmation process and determines whether the yarn thickness confirmed in the second confirmation process satisfies the predetermined reduction condition each time the yarn travels a second predetermined length.
    Consequently, even with the automatic winder adapted to wind the yarn while the winding speed varies, the yarn thickness can be corrected with an appropriate timing by making the correction based on the length of movement of the yarn.
    BRIEF DESCRIPTION OF THE DRAWINGS
    Figure 1 is a front view illustrating a general configuration of an automatic winder comprising a yarn monitoring device according to an embodiment of the present invention; Figure 2 is a side view of a winding unit comprising the yarn monitoring device; Figure 3 is a block diagram illustrating an electrical configuration of the yarn monitoring device; Figure 4 is a graph illustrating a relationship of a yarn movement length and a voltage of an electrical signal (yarn thickness); Figure 5 is a graph illustrating a relationship of yarn movement length, yarn thickness and a correction amount; Figure 6 is a flow chart illustrating a first half of a yarn thickness correction process in consideration of a change in temperature and the like during the movement of the yarn; and Figure 7 is a flow chart illustrating a second half of the yarn thickness correction process in consideration of the change in temperature and the like during the movement of the yarn.
    DETAILED DESCRIPTION OF PREFERRED MANUFACTURING FORMS
    [0025] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
    As illustrated in Figure 1, an automatic winder (yarn winding machine) 1 comprises, as main components, a plurality of winding units (yarn winding units) 10 arranged side by side, and a control section machine 11 arranged at one end in a direction in which the winding units 10 are arranged.
    [0027] The machine control section 11 comprises a display device 12 capable of displaying information associated with each winding unit 10, an instruction input section 13 capable of entering various types of instructions by an operator in relation to the machine control section 11 and the like. The operator of the automatic rewinder 1 can check various types of displays displayed on the display device 12 and can also conveniently use the instruction input section 13 to collectively manage the plurality of winding units 10 with the machine control section 11 .
    Each winding unit 10 shown in Figures 1 and 2 is configured to unwind a yarn from a yarn supply spool 20 and rewind the yarn around a winding spool 22. The winding spool 22 with a yarn 21 wound around it is indicated as cone 23. In the following description, "upstream in the direction of yarn movement" and "downstream in the direction of yarn movement" indicate respectively upstream and downstream when looking in the direction of movement of the yarn 21.
    As illustrated in Figure 2, the winding unit 10 comprises a main body frame 24, a yarn feed section 25 and a winding section 26 as main components.
    The main body frame 24 is arranged at one side of the winding unit 10. Most of the components of the winding unit 10 are supported directly or indirectly by the main body frame 24.
    [0031] The yarn feeding section 25 is configured to be able to support the yarn feeding reel 20, adapted to feed the yarn 21, in a substantially vertical state. The winding section 26 comprises a support 28 and a winding cylinder 29.
    [0032] The support 28 rotatably supports the take-up reel 22. Furthermore, the support is configured to allow a perimeter surface of the back-up winding reel 22 to come into contact with a perimeter surface of the winding cylinder 29. The winding cylinder 29 is arranged to face the take-up reel 22 and is configured to be rotatably driven by a take-up cylinder drive motor (not shown). A translation groove (not shown) having a reciprocal spiral shape for translating the yarn 21 wound around the winding reel 22 is formed on the outer peripheral surface of the winding cylinder 29.
    [0033] The winding reel 22 is driven and rotated by the rotatable drive of the winding cylinder 29 with the outer peripheral surface of the winding reel 22 in contact with the winding cylinder 29. Therefore, the yarn 21 unwound from the feeding reel of the Yarn 20 can be wound around the take-up reel 22 as it is translated by the translation groove. The component suitable for translating the yarn 21 is not limited to the winding cylinder 29 and, for example, instead of the winding cylinder 29, it is possible to adopt an arm translating device capable of guiding the yarn 21 with a translation guide operated alternately with a predetermined translation width. When the arm translating device is adopted, preferably the winding reel 22 is rotatably driven directly.
    Each winding unit 10 comprises a drive control section 30. The drive control section 30 is configured with hardware, such as CPU, ROM and RAM, and software, such as a control program stored in ROM or RAM . With the cooperation of hardware and software, each component of the winding unit 10 is controlled. The unit control section 30 of each winding unit 10 is configured to be able to be in communication with the machine control section 11. Therefore, the operation of each winding unit 10 can be intensively managed by the machine control section 11.
    [0035] The winding unit 10 has a configuration in which an unwinding facilitating device 31, a tension applying device 32, a yarn splicing device 33 and a yarn monitoring device 6 are arranged in this order from the upstream position in the direction of yarn movement on a yarn movement path between the yarn feeding section 25 and the winding section 26.
    [0036] The unwinding facilitating device 31 comprises an adjustment element 35 able to come into contact with a portion (balloon) protruding towards the external side when the yarn 21 unwound from the yarn supply reel 20 is made to oscillate by a centrifugal force . The contact of the adjusting element 35 with the bale prevents the yarn 21 from being swung in excess and keeps the bale at a predetermined size, thus allowing the unwinding of the yarn 21 from the yarn supply reel 20 to be performed with a preset voltage.
    The tension applying device 32 is adapted to apply a predetermined tension on the moving yarn 21. The tension applying device 32 of the present embodiment may be a comb type tensioning device in which teeth of movable combs are arranged relative to fixed comb teeth. The tension applying device 32 applies an appropriate tension on the yarn 21 by passing the yarn 21 as it is folded between the reed teeth in an engaged state. As the tension applying device 32 it is possible to adopt a tension applying device other than the comb type, for example a disc type tensioning device.
    The yarn splicing device 33 is configured to splice (yarn splicing operation) a yarn (lower yarn) from the yarn supply spool 20 and a yarn (upper yarn) from the winding spool 22 when the yarn 21 between the yarn supply reel 20 and the take-up reel 22 are disconnected, such as when the yarn is cut with a cutting device (cutter) 16, which will be described later. The configuration of the yarn splicer 33 is not particularly limited, but a pneumatic splicer can be adopted which twists the ends of the yarn with a swirling air flow generated by compressed air, or a mechanical knotter and the like can be adopted. An upper yarn suction tube 44 sucks and catches the end of the yarn from the take-up reel 22 and guides the yarn end towards the yarn splicer 33. A lower yarn suction tube 45 sucks and captures the yarn. yarn end from yarn supply spool 20 and guides yarn end towards yarn splicer 33.
    The yarn monitoring device 6 monitors the state (thickness, mixture of foreign substances such as colored yarn, polypropylene and the like) of the moving yarn 21 and detects a yarn defect contained in the yarn 21. The yarn monitoring device 6 can detect a yarn movement speed of the moving yarn 21. The yarn monitoring device 6 further comprises the cutter 16 adapted to cut the yarn 21 when the yarn monitoring device 6 detects the yarn defect. The detailed configuration of the yarn monitoring device 6 will be described later.
    Now, a brief description of an operation relating to when the yarn defect and the like is detected by the yarn monitoring device 6 will be provided with reference to Figure 2.
    [0041] When the yarn defect and the like is detected in the yarn monitoring, the yarn monitoring device 6 activates the cutter 16 to cut the yarn 21, and also transmits a yarn defect detection signal to the yarn control section unit 30. The yarn 21 positioned downstream of the cutting area is wound once in a package 23. The yarn 21 wound in the package 23 in this case includes a portion of yarn defect and the like detected by the yarn monitoring device 6 After receiving the yarn defect detection signal, the unit control section 30 stops winding of the yarn 21 by the winding section 26.
    The lower yarn suction tube 45 sucks in and catches the end of the yarn fed from the yarn supply spool 20 and guides the yarn end towards the yarn splicer 33. Before or after that, the upper yarn suction tube 44 sucks and captures the end of the yarn wound in the package 23 and guides the yarn end towards the yarn joining device 33. In this case, the portion of the yarn defect and the like wound in the package 23 is sucked in and pulled out of the upper yarn suction tube 44.
    The yarn joining device 33 joins the yarn ends guided by the upper yarn suction tube 44 and the lower yarn suction tube 45. Therefore, after the portion including the yarn defect and the like has been removed, the yarn 21 cut by the cutter 16 is connected again.
    After the yarn splicing operation has been completed by the yarn splicing device 33, the unit control section 30 resumes winding the yarn 21 by the winding section 26. According to the described operations above, the defect in yarn and the like detected by the yarn monitoring device 6 can be removed, and the winding of yarn 21 in the package 23 can be resumed.
    Furthermore, in the present embodiment, the unit control section 30 performs a nuisance check (periodic check) to prevent the generation of a rib winding (a state in which the yarn 21 is concentrated in an area and wrapped in an overlapping manner). Specifically, the unit control section 30 controls the drive motor of the winding cylinder (not shown) and periodically varies the rotation speed of the winding cylinder 29 to make the bobbin 23 and the winding cylinder 29 slide, thus changing the winding speed. Therefore, in the present embodiment, the yarn movement speed of the yarn 21 is not constant. Furthermore, since the package 23 and the winding cylinder 29 run, an accurate yarn movement speed cannot be detected even if the winding cylinder 29 rotation speed is used. Furthermore, the yarn movement speed is not constant even if the noise check is not performed. For example, when a cone-shaped package is formed, the speed of movement of the yarn varies greatly depending on whether the yarn is wound around the long diameter side of the package or the short diameter side of the package and, consequently, it is difficult. detect an accurate speed of movement of the yarn exclusively on the basis of the rotation speed of the winding cylinder 29.
    Next, a description of the details of the yarn monitoring device 6, in particular of the electrical configuration, will be provided with reference to Figure 3. Figure 3 is a block diagram illustrating an electrical configuration of the yarn monitoring device 6.
    As illustrated in Figure 3, the yarn monitoring device 6 comprises an optical sensor unit (yarn thickness detection section) 50 and a yarn monitoring control section 60.
    [0048] The sensor unit 50 can measure the state of the yarn 21. The sensor unit 50 comprises a drive circuit 51, a light projection section 52, a light receiving section 53, an amplifier 54, a high pass filter 55 and an amplification circuit 56. The cutter 16 is fixed to a housing of the sensor unit 50. In the present embodiment, in total two groups of light projection section 52 and receiving section are provided of the port 53, in which each group is arranged in a different position on the path of movement of the yarn. In other words, the light projection section 52 comprises a first light projection section arranged upstream of the yarn movement path and a second light projection section arranged downstream of the yarn movement path. The light receiving section 53 comprises a first light receiving section arranged upstream of the yarn movement path and a second light receiving section arranged downstream of the yarn movement path.
    The light projection section 52 comprises a light emitting element configured by means of a light emitting diode (LED). The light projection section 52 radiates with light a space (slit-shaped recess of Figure 3), through which the yarn 21 flows, with the light in an amount corresponding to a drive voltage input from the drive circuit 51 The drive voltage generated by the drive circuit 51 is determined based on an electrical signal input from the yarn monitoring control section 60.
    The light receiving section 53 is disposed on an opposite side of the light projecting section 52 with a yarn path between them. The light receiving section 53 comprises a light receiving element configured by means of a photodiode and the like. The light receiving section 53 receives the transmitted light of the light radiated by the light projection section 52 onto the yarn 21, and emits the electrical signal (output voltage or output current) corresponding to the amount of light reception. The electrical signal varies according to the shape (cross-sectional shape) of the yarn 21 present in a sensing region 70. The transmitted light indicated herein is the light that has reached the light receiving section 53 when the light emitted from the section light projection 52 is partially shielded by the presence of the yarn 21. In other words, the transmitted light is the light that has passed through the yarn 21. The sensing region 70 is a region, in the slit-shaped recess, affected by the light from the light projection section 52, and is a region in which the yarn 21 can be detected depending on the light receiving amount of the light receiving section 53.
    The electrical signal emitted by the light receiving section 53 is amplified by the amplifier 54 and is also subject to an inversion process. Therefore, a conversion is accomplished such that the electrical signal emitted by the amplifier 54 decreases as the light receiving amount of the light receiving section 53 increases (i.e., the tighter the yarn 21 is). . A signal of a predetermined high frequency in the electrical signal emitted by the amplifier 54 is extracted into the high pass filter 55, and the electrical signal is again amplified by the amplification circuit 56. The sensor unit 50 detects the thickness of yarn 21 in this way. The sensor unit 50 sends the electrical signal indicating the result of the yarn thickness detection to the yarn monitoring control section 60.
    The yarn monitoring control section 60 includes a yarn movement length detection section 61 and a correction section 62. The yarn movement length detection section 61 detects the length (length of movement of the yarn yarn) of the yarn 21 which flows through the detection region 70 obtaining, starting from the irregularity of the thickness and the like of the yarn 21, to what extent the electric signal emitted by the light receiving section 53 is delayed with respect to the electric signal emitted by the other light receiving section 53. Correction section 62 corrects the yarn thickness in consideration of the variation of properties and the like of the light projection section 52 and of the light receiving section 53 caused by the temperature variation (this will be described in detail below). The sensor unit 50 and the yarn monitoring control section 60 are arranged for each automatic winder 1, so that the correction of the yarn thickness is performed for each automatic winder 1.
    The cutter 16 described above is disposed in proximity to the sensing region 70 formed in the housing of the sensor unit 50. The cutter 16 comprises a cutting blade (not shown) operated, for example, by a solenoid. The cutter 16 is electrically connected to the yarn monitoring control section 60 and is capable of cutting the yarn 21 based on a cutting signal emitted from the yarn monitoring control section 60.
    Next, a description of the correction performed by the correction section 62 of the yarn monitoring device 6 will be provided with reference to Figures 4 to 7.
    [0055] In the graph of Figure 4, a horizontal axis indicates a length of movement of the yarn, and a vertical axis indicates a voltage (i.e., the thickness of yarn) of an electrical signal input from the sensor unit 50 into the section yarn monitoring control 60. Below, the graph will be described by time series. At an instant in time when the length of movement of the yarn is at a left end, the winding of the yarn 21 has not yet started, and the yarn 21 is not present in the sensing region 70. Therefore, the tension of when the length of movement of the yarn is in the left end corresponds to a tension (initial adjustment value of Figure 5) emitted regardless of the presence / absence of the yarn 21.
    Next, the upper yarn suction tube 44 and the lower yarn suction tube 45 guide the yarn ends towards the yarn splicer 33 to insert the yarn 21 into the sensing region 70. In the graph of the figure 4, after the yarn 21 has been inserted into the sensing region 70, the yarn 21 is shielded from light and, therefore, the voltage of the electrical signal becomes high. Since the yarn 21 is not in motion at this stage, the yarn thickness does not vary and, consequently, the voltage of the electrical signal is constant.
    [0057] Subsequently, the yarn joining device 33 performs the yarn joining operation, after which the movement of the yarn 21 is started. In the graph of figure 4, after the start of the yarn movement 21, the signal voltage electric varies according to the irregularity of the thickness and the like of the yarn 21.
    [0058] Correction section 62 obtains a "yarn reference thickness", which is a value obtained by subtracting the initial adjustment value described above from an average of the yarn thicknesses (electrical signal voltages) starting from the start of the movement of the yarn 21 until the yarn 21 has traveled a predetermined length (in the present embodiment, 25 m) (see Figure 5). The reference thickness of the yarn can be obtained starting from the average of the thicknesses of the yarn starting from the start of the movement of the yarn 21 up to the elapsing of a predetermined time. The predetermined length and the predetermined time in obtaining the reference thickness of the yarn can always be constant, or a value corresponding to the winding conditions (type, winding speed and the like of the yarn 21) can be used.
    After the reference thickness of the yarn has been obtained, the correction section 62 obtains (calculates) an average yarn thickness. The average yarn thickness is the average (moving average) of the yarn thicknesses of the yarn 21 in a predetermined length or in a previous predetermined time. The average yarn thickness is a value comprising an adjustment value, as opposed to the reference yarn thickness. In the present embodiment, the average of the previous 25 m yarn thickness, which is equal to the reference yarn thickness, is assumed as the average yarn thickness. The predetermined length or predetermined time in calculating the reference thickness of the yarn is preferably the same but may be different from the predetermined length or the predetermined time in calculating the average thickness of yarn. Therefore, when starting the calculation of the average yarn thickness (L0 in Figure 4), the (reference yarn thickness + initial adjustment value) and the average yarn thickness are the same. In the present embodiment, the correction section 62 updates the average yarn thickness each time the yarn 21 travels 5 m.
    The correction section 62 starts correcting the yarn thickness after starting the calculation of the average yarn thickness. Below, a description of the correction performed by the correction section 62 will be provided with reference to Figures 6 and 7. Figures 6 and 7 are flowcharts illustrating a yarn thickness correction process in consideration of temperature variation and the like. during the movement of the yarn.
    First, the correction section 62 acquires the yarn movement length detected by the yarn movement length detection section 61 (S101). Subsequently, the correction section 62 waits until the acquired yarn movement length is an integer multiple of a first predetermined length (5 m) (S102). The first predetermined length is a period to perform a correction of the yarn thickness (hereinafter referred to as "first correction") when the detected yarn thickness has increased (including the case where the voltage of the electrical signal has increased due to the variation temperature). In other words, the correction section 62 determines whether to perform the first correction each time the yarn 21 travels the first predetermined length. Further, the correction section 62 performs a confirmation process (first confirmation process) to confirm the yarn thickness and determines whether the yarn thickness confirmed in the first confirmation process satisfies a predetermined increase condition each time the yarn 21 travels. the first predetermined length. The period of the first correction is not limited to the length of movement of the yarn, and can be performed at any predetermined time (first predetermined time).
    When the yarn movement length becomes an integer multiple of the first predetermined length (5, 10, 15m and so on), the correction section 62 obtains the average yarn thickness as described above, and determines whether the average thickness of yarn is greater than the average yarn thickness of a previous period (i.e. 5 m earlier) (S103). When the average yarn thickness of a previous period does not exist or is zero (immediately after the start of the movement of the yarn 21, and the like), the average yarn thickness obtained in this time is stored and the process is terminated.
    [0063] When the average yarn thickness obtained in this time is higher than the average yarn thickness of a previous period, the correction section 62 activates a first correction execution indicator (S104) and passes to the next process. When the average yarn thickness obtained in this time is less than or equal to the average yarn thickness of a previous period, the correction section 62 passes to the next process without activating the first correction indicator.
    [0064] Next, the correction section 62 determines whether the acquired yarn movement length has reached a second predetermined length (35 m) (S105). The second predetermined length is a period to perform a correction of the yarn thickness (hereinafter referred to as the "second correction") when the yarn thickness is reduced (including the case where the voltage of the electrical signal is reduced due to the variation of temperature). In other words, the correction section 62 determines whether to perform the second correction each time the yarn 21 travels the second predetermined length. Furthermore, the correction section 62 performs a confirmation process (second confirmation process) to confirm the yarn thickness and determines whether the yarn thickness confirmed in the second confirmation process satisfies a predetermined reduction condition each time the yarn 21 runs. the second predetermined length. The period of the second correction is not limited to the length of movement of the yarn, and can be performed at any predetermined time (second predetermined time).
    [0065] When the yarn movement length has reached (exceeded) the second predetermined length, the correction section 62 determines whether the average yarn thickness obtained in this time is less than the average yarn thickness of a previous period (i.e. say, 35 m before) (S106). When the average yarn thickness obtained in this time is less than the average yarn thickness of a previous period, the correction section 62 activates a second correction execution indicator (S107) and passes to the next process. When the average yarn thickness obtained in this time is higher than the average yarn thickness of a previous period, the correction section 62 passes to the next process without activating the second correction indicator. In steps S106 and S107 it can be determined whether the average yarn thickness of the second current period is continuously reduced, and the second correction run indicator can be activated if the average yarn thickness is continuously reduced.
    [0066] When the determination of step S106 is performed, the correction section 62 resets the value of the yarn movement length (S108). As a result, the movement length of the yarn is counted again starting from zero.
    Next, the correction section 62 determines whether the first correction execution flag or the second correction execution flag is activated (S109 in Fig. 7). If neither of the two correction execution indicators are activated, the correction section 62 terminates the process. When one of the correction execution indicators is activated, the correction section 62 acquires the reference thickness of the yarn obtained at the start of the movement of the yarn 21 (S110).
    [0068] Next, the correction section 62 calculates a new correction amount (S111). Specifically, as illustrated in Figure 5, a correction adjustment value is calculated by subtracting the reference thickness of the yarn from the average yarn thickness obtained in this time. To describe this calculation, the reference thickness of the yarn indicates more or less clearly the thickness of the yarn since the reference thickness of the yarn is obtained in a situation where the influence and the like of the temperature variation is low. Therefore, the adjustment value (correction adjustment value) which takes into account the influence of the actual temperature change, the change in the amount of fiber of the yarn 21 or the like, can be calculated by subtracting the reference thickness of the yarn from the thickness. yarn medium. Further, the amount of fluctuation (correction amount) of the tension due to the influence of the temperature change, the change in the amount of fiber of the yarn 21 or the like, is obtained by subtracting the initial adjustment value from the correction adjustment value. The amount of correction is positive in the example shown in Figure 5, but it can be negative depending on the situation.
    After the calculation described above, the correction section 62 determines whether an absolute value of the correction amount is greater than a predetermined threshold value (S112). When the absolute value of the correction amount is greater than the predetermined threshold value, the correction section 62 determines that the amount of change in the detection value due to the influence of the temperature change increases and the influence on the gain becomes too large and , therefore, activates the cutter 16 to cut the yarn 21 (S113).
    On the other hand, when the absolute value of the correction amount is less than or equal to the predetermined threshold value, the correction section 62 corrects the yarn thickness based on the calculated correction amount (S114). Therefore, when the first correction execution flag is turned on, the first correction is performed. For example, when the yarn movement length of figure 5 is between 0m and 35m (first count), the average yarn thickness is gradually increased from 5m before and, therefore, the amount of correction is corrected at each first predetermined length (every 5 m). When the second correction execution indicator is turned on, the second correction is performed. For example, when the yarn movement length of figure 5 is 35m (second and third count), the average yarn thickness is reduced compared to the average yarn thickness of 35m before and therefore the correction amount is correct . When both the first correction execution flag and the second correction execution flag are turned on, one of the previously defined corrections is performed.
    Thus, in the present embodiment, the period for determining whether correction is needed differs between when the increased amount of the detected yarn thickness is greater than or equal to a predetermined amount (when the first correction is performed) and when the amount reduced yarn thickness detected is greater than or equal to a predetermined amount (when the second correction is performed). This is due to the following reasons. That is to say, a case where the yarn thickness is increased includes a situation where a cotton dust is entangled around the yarn 21 in the generation stage of the yarn 21, and the like, and the yarn thickness increases rapidly in such a situation. . On the other hand, as the yarn thickness increases due to the influence of the temperature change, the detection value of the sensor unit 50 (i.e., the detected yarn thickness) changes gradually. Thus, it is possible to distinguish in a short time whether the yarn thickness has actually increased or the yarn thickness appears to have increased due to the influence of the temperature change. Therefore, it can be frequently determined (shorter period) whether the yarn thickness has increased. A case in which the yarn thickness is reduced includes a situation in which fibers contained in the yarn 21 in the stage of generation of the yarn 21 are gradually removed, and the like, and the yarn thickness is gradually reduced in this situation. On the other hand, when the yarn thickness is reduced due to the influence of the temperature change, the detection value of the sensor unit 50 (i.e., the detected yarn thickness) changes gradually. Therefore, when the yarn thickness is reduced, it is necessary to lengthen the period to distinguish whether the yarn thickness is actually reduced or whether the yarn thickness appears to be reduced due to the influence of the temperature change. In view of the above, the period of the first correction is shortened with respect to the period of the second correction in the present embodiment.
    [0072] When the yarn is disconnected (yarn break or yarn cut by the cutter) after starting the correction, as shown in Figure 4, the initial adjustment value is correct. Furthermore, the reference thickness of the yarn can be calculated by means of the yarn 21 running a length (in the present embodiment, 25 m) corresponding to the calculation of the reference yarn thickness from the start of the movement of the yarn 21. Therefore, the correction of the yarn thickness is taken up again with this timing.
    As described above, the yarn monitoring device 6 of the present embodiment comprises the optical sensor unit 50 and the correction section 62. The sensor unit 50 detects the yarn thickness of the moving yarn 21. Correction section 62 performs a first correction for correcting the yarn thickness in a predetermined period (when a correction is required) based on the increased amount of yarn thickness detected by the sensor unit 50, and a second correction for correcting the yarn thickness. yarn thickness in a different period than the first correction (when a correction is required) based on the reduced amount of yarn thickness detected by the sensor unit 50.
    Therefore, since the behavior in the variation of the yarn thickness differs between when the yarn thickness is increased and when the yarn thickness is reduced, the period corresponding to each case is set so that the yarn thickness can be corrected with an appropriate timing corresponding to the change in yarn thickness, while taking into account the change in temperature during the movement of the yarn.
    The yarn monitoring device 6 of the present embodiment comprises the yarn movement length detection section 61 adapted to detect the yarn movement length which is the length that the yarn 21 has traveled. The correction section 21 determines whether to perform the first correction each time the yarn 21 travels the first predetermined length, and determines whether to perform the second correction each time the yarn 21 travels the second predetermined length based on the detected yarn movement length. from the yarn movement length sensing section 61.
    Thus, the correction timing is determined based on the yarn movement length, so that the yarn thickness can be corrected more accurately than in the case where the correction timing is determined based on time .
    [0077] Furthermore, in the yarn monitoring device 6 of the present embodiment, the correction section 62 obtains as a reference thickness of the yarn a value based on the average of the yarn thicknesses starting from the start of the movement of the yarn 21 up to when the yarn 21 has traveled a predetermined length, and performs the first correction or the second correction based on the increased quantity or the reduced quantity with respect to the reference thickness of the yarn.
    [0078] Therefore, it is assumed that the influence of the temperature variation is low for a predetermined time from the start of the movement of the yarn 21, so that the influence of the temperature variation and the like can be accurately estimated by taking as a reference the average of the yarn thickness (reference yarn thickness) acquired during that time. Therefore, the yarn thickness can be corrected more accurately.
    Furthermore, in the present embodiment, the winding section 26 winds the yarn 21 while varying the winding speed at least temporarily to perform the nuisance control. Correction section 62 determines whether to perform the first correction each time yarn 21 travels the first predetermined length, and determines whether to perform the second correction each time yarn 21 travels the second predetermined length based on the detected yarn movement length. from the yarn movement length sensing section 61.
    Consequently, even with the automatic winder adapted to wind the yarn 21 while the winding speed varies, the yarn thickness can be corrected with an appropriate timing by making the correction based on the length of movement of the yarn.
    The preferred embodiment of the present invention has been described above, but the configuration described above can be modified as follows.
    In the embodiment described above, the yarn monitoring device 6 has the voltage reversed from the amplification circuit 56 and, consequently, the yarn thickness increases as the voltage of the electrical signal input to the control section increases. yarn monitoring 60. However, it is also possible to adopt a configuration in which the tension is not reversed. In this case, the correction of when the voltage of the electrical signal input to the yarn monitoring control section 60 decreases (i.e., when the yarn thickness is increased) corresponds to the first correction.
    In the embodiment described above, the yarn monitoring device 6 has a configuration in which the cutter 16 is incorporated. However, the present invention is not limited thereto and the cutter can be placed outside the monitoring device yarn 6, and the cutter can be controlled by the unit control section 30. In this case, the yarn monitoring control section 60 sends the yarn cutting signal to the unit control section 30, and the unit control section control unit 30 drives the cutter according to the yarn cut signal. Furthermore, the yarn monitor 6 is configured to cut the yarn 21 with the cutter 16 and remove the yarn defect when the yarn defect is detected, but the yarn monitoring device of the present invention may be a device which simply monitor the state of the yarn 21 without cutting the yarn 21 with the cutter 16.
    In the embodiment described above, the yarn monitoring device 6 comprises a yarn thickness detecting section and the yarn movement length detecting section, but each between the yarn thickness detecting section and the yarn movement length detection section can be made with different devices. When the yarn monitoring device 6 does not include the yarn movement length detecting section, and the yarn movement length (yarn movement speed 21) is detected with a device other than the yarn monitoring device 6, the yarn monitoring device 6 may have a configuration which comprises a light projection section and light receiving section assembly.
    The yarn monitoring device 6 is not limited to the configuration in which two groups of light projection section and light projection section are arranged in total, where each group is arranged at different positions on the path of movement of the yarn. As described above, only one assembly of light projection section and light receiving section can be arranged. Regardless of whether only one group of light projection section and light receiving section is arranged or whether multiple groups are arranged, the number of light projection sections and the number of light receiving sections arranged in a group is not it is limited to one each. For example, in a group, one or a plurality of light projection sections and one or a plurality of light receiving sections may be arranged. Specifically, a first group arranged upstream can comprise a light projection section and three light receiving sections, and a second group arranged downstream can comprise two light projection sections and two light receiving sections.
    [0086] In the embodiment described above, it is assumed that the predetermined length for obtaining the reference thickness of the yarn is 25 m, that the period of the first correction is 5 m and the period of the second correction is 35 m, but these values are arbitrary and can be changed appropriately (for example, they can be double or triple the above values). Furthermore, in the embodiment described above, it is assumed that the predetermined length for obtaining the reference thickness of the yarn and the period of the second correction are integer multiples of the period of the first correction, but may not be integer multiples.
    The process described in the flowcharts described above is an example and it is possible to make additions, variations, changes in order, deletions and the like of the flow within the scope without departing from the present invention.
    In the embodiment described above, the period of the first correction is shorter than the period of the second correction but the period of the first correction may be longer than the period of the second correction depending on the winding conditions and the like.
    [0089] In the embodiment described above, the calculation is performed by entering values such as the reference yarn thickness, the average yarn thickness, the initial adjustment value, the correction adjustment value and the correction value, but such calculation is an example and can be changed appropriately. For example, the calculation can be performed by assuming the value obtained by adding the initial adjustment value to the reference yarn thickness of the embodiment described above as "reference yarn thickness".
    Further, in the embodiment described above, the amount of correction is calculated from the amount of change when the electrical signal is changed for the temperature change, as illustrated in Sili in the flow chart of Figure 7. However, for example, instead of calculating the amount of correction from the amount of variation, a predetermined fixed value can be added / subtracted from the previous correction adjustment value to correct the yarn thickness when it is determined that correction is needed for each period of correction. As a result, the correction can be done more easily.
    More precisely, a first predetermined fixed value is added every first period to the initial adjustment value to obtain the correction adjustment value (correction amount), and the first correction is performed based on the correction amount obtained. Also, a second predetermined fixed value is subtracted every second period from the initial adjustment value to obtain the correction adjustment value (correction amount), and the second correction is performed based on the correction amount obtained. For example, describing this by referring to Figure 5, at the instant in time when the yarn movement length is 5m of the first period, the first fixed value is added to the initial adjustment value to obtain the correction adjustment value for perform the first correction. In the instant in time when the yarn movement length is 10 m of the second period, the first fixed value is further added to the previous correction adjustment value (value obtained by adding the first fixed value to the initial adjustment value) to obtain the correction amount to perform the first correction.
    As described above, the initial adjustment value is defined when the yarn 21 is not present in the sensing region 70 prior to the start of the movement of the yarn 21. The predetermined fixed value is preferably set to different values for when the yarn 21 becomes thick and when the yarn 21 becomes thin, it can be set to the same value. For the predetermined fixed value, a numerical value that allows the apparent change in yarn thickness and the actual change in yarn thickness for thermal drift to be distinctly recognizable can be set experimentally (by repeated experiments) in advance.
    At least part of the process performed by the yarn monitoring control section 60 (for example, the correction performed by the correction section 62) can be performed by the unit control section 30 or the machine control section 11.
    The configuration of the present invention is not limited to the automatic winder and can be applied to other yarn winding machines, such as for example a rewinding machine, a spinning machine (for example, a pneumatic spinning machine, an open-end spinning machine) and so on.
    权利要求:
    Claims (10)
    [1]
    1. Yarn monitoring device (6) characterized by comprising:an optical yarn thickness sensing section (50) adapted to detect a yarn thickness of a moving yarn (21); isa correction section (62) adapted to carry out a correction of the yarn thickness,where the fix section is configured forperforming a first confirmation process comprising a step of confirming the yarn thickness detected by the yarn thickness detection section, and performing a first correction comprising a step of correcting the yarn thickness when the yarn thickness confirmed in the first confirmation process satisfies a predetermined increase condition, in a first predetermined period which is a first time period or a first length traveled by the yarn, andperforming a second confirmation process comprising a step of confirming the yarn thickness detected by the yarn thickness detection section, and performing a second correction comprising a step of correcting the yarn thickness when the yarn thickness confirmed in the second confirmation process it satisfies a predetermined reduction condition, in a second predetermined period which is a second period of time or a second length traveled by the yarn, said second predetermined period being different from said first predetermined period.
    [2]
    2. Yarn monitoring device according to claim 1, characterized in that the first predetermined period is shorter than the second predetermined period.
    [3]
    A yarn monitoring device according to claim 1 or 2, wherein said first predetermined period is a first length traveled by the yarn and said second predetermined period is a second length traveled by the yarn, characterized by further comprising:a yarn movement length sensing section (61) adapted to detect a yarn movement length which is a length that the yarn has traveled,where the correction section is configured for:based on the yarn movement length detected by the yarn movement length detection section,performing the first confirmation process and determining whether the yarn thickness confirmed in the first confirmation process satisfies the predetermined increase condition each time the yarn travels said first predetermined length, andperforming the second confirmation process and determining whether the yarn thickness confirmed in the second confirmation process satisfies the predetermined reduction condition each time the yarn travels said second predetermined length.
    [4]
    A yarn monitoring device according to claim 1 or 2, wherein said first predetermined period is a first period of time and said second predetermined period is a second period of time, characterized in that the correction section is configured to :performing the first confirmation process and determining whether the yarn thickness confirmed in the first confirmation process satisfies the predetermined increase condition each time said first predetermined time period has elapsed, andperforming the second confirmation process and determining whether the yarn thickness confirmed in the second confirmation process satisfies the predetermined reduction condition each time said second predetermined time period has elapsed.
    [5]
    Yarn monitoring device according to one of claims 1 to 4, characterized in that the correction section is configured forobtain, as a reference yarn thickness, a value based on an average of yarn thicknesses starting from the start of the yarn movement until the yarn has traveled a predetermined length or until a predetermined time has elapsed,making the first correction based on an increased amount of yarn thickness relative to the reference yarn thickness, eperform the second correction based on a reduced amount of yarn thickness relative to the reference yarn thickness.
    [6]
    6. Yarn monitoring device according to one of claims 1 to 4, characterized in that the correction section is configured forperforming the first correction based on a correction amount obtained by adding a first predetermined fixed value defined in advance for each first predetermined period to an initial adjustment value defined before the start of the yarn movement, andperforming the second correction based on a correction amount obtained by subtracting a second predetermined fixed value defined in advance for each second predetermined period from the initial adjustment value.
    [7]
    7. Yarn monitoring device according to one of claims 1 to 6, characterized in that said correction section is configured in such a way that:the first correction is performed when a yarn thickness, which is detected at a time instant of termination of a first current period equal to said first predetermined period and which is confirmed in the first confirmation process, has increased by a predetermined quantity with respect to one yarn thickness at a time instant of termination of a first preceding period, ethe second correction is performed when a yarn thickness of a second current period equal to said second predetermined period, confirmed in the second confirmation process, is continuously reduced.
    [8]
    Yarn monitoring device according to one of claims 1 to 7, characterized in that the correction section is configured forcalculating an average of previously detected yarn thicknesses over a predetermined period which is a predetermined length or a predetermined time, andcarrying out the first correction to correct the yarn thickness when the average of the yarn thicknesses at the time instant of termination of the first current period, equal to said first predetermined period, satisfies the predetermined increase condition.
    [9]
    9. Yarn winding machine (1) characterized by comprising:a winding section (26) adapted to wind a yarn to form a bobbin;a yarn monitoring device according to one of claims 1 to 8.
    [10]
    Yarn winding machine (1) according to claim 9, which can be used as an automatic winder and further comprises:a yarn movement length sensing section (61) adapted to detect a yarn movement length which is a length that the yarn has traveled,wherein the winding section is configured to wind the yarn while varying a winding speed at least temporarily, andthe correction section is configured for,based on the yarn movement length detected by the yarn movement length detection section,performing the first confirmation process and determining whether the yarn thickness confirmed in the first confirmation process satisfies the predetermined increase condition each time the yarn travels a first predetermined length, andperforming the second confirmation process and determining whether the yarn thickness confirmed in the second confirmation process satisfies the predetermined reduction condition each time the yarn travels a second predetermined length.
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    同族专利:
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    法律状态:
    优先权:
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    JP2016014512A|JP2017132597A|2016-01-28|2016-01-28|Yarn monitoring device, yarn winder, and automatic winder|
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