JP2017132597A - Yarn monitoring device, yarn winder, and automatic winder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a yarn monitoring device performing processing for yarn thickness correction at appropriate timing taking a temperature change during traveling of a yarn into consideration.SOLUTION: A yarn monitoring device comprises an optical yarn thickness detection part, and a correction part. The yarn thickness detection part detects a yarn thickness of a traveling yarn. The correction part performs: a first correction, in which the yarn thickness is corrected at a predetermined period, on the basis of an increase amount of the yarn thickness detected by the yarn thickness detection part, and a second correction, in which the yarn thickness is corrected at a period different from that of the first correction, on the basis of a decrease amount of the yarn thickness detected by the yarn thickness detection part.SELECTED DRAWING: Figure 5

Description

  The present invention mainly relates to a yarn monitoring device that monitors a traveling yarn.

  2. Description of the Related Art Conventionally, yarn winding machines such as a spinning machine and an automatic winder are provided with an optical yarn monitoring device that monitors a wound yarn. The yarn monitoring device irradiates the running yarn with light, and receives light transmitted through the yarn or reflected light reflected by the yarn with a light receiving element such as a photodiode, thereby monitoring the thickness of the yarn in real time. Then, a yarn defect (a portion where the yarn quality is abnormal) is detected. Patent Documents 1 and 2 disclose this type of optical yarn monitoring device.

JP 2000-327226 A JP 2007-131974 A

  During winding of the yarn, wind is generated when the yarn travels and the temperature of the yarn monitoring device is lowered, or frictional heat is generated when the yarn travels and the temperature of the yarn monitoring device is increased. The characteristics of the light projecting element and the light receiving element are affected by such a change in temperature (such as the amount of light to be projected and the current to be output). In this regard, Patent Documents 1 and 2 disclose a process for correcting an output signal or the like of the light receiving element in consideration of a temperature change during traveling of the yarn. However, Patent Documents 1 and 2 do not describe in detail the timing for performing this correction.

  The present invention has been made in view of the above circumstances, and its main object is to provide a yarn monitoring device that performs processing for correcting the thickness of the yarn at an appropriate timing in consideration of temperature change during traveling of the yarn. It is to provide.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to a first aspect of the present invention, a yarn monitoring device having the following configuration is provided. That is, the yarn monitoring device includes an optical yarn thickness detection unit and a correction unit. The thread thickness detection unit detects the thread thickness of the traveling thread. The correction unit includes a first correction that corrects the yarn thickness at a predetermined cycle based on an increase amount of the yarn thickness detected by the yarn thickness detection unit, and a yarn that is detected by the yarn thickness detection unit. Based on the thickness reduction amount, a second correction for correcting the thread thickness at a different period from the first correction is performed.

  Thereby, when the yarn thickness increases and when the yarn thickness decreases, the behavior of the change in the yarn thickness is different, so by setting the period according to them, considering the temperature change during traveling of the yarn, The thread thickness can be corrected at an appropriate timing according to the change in the thread thickness.

  In the yarn monitoring apparatus, it is preferable that the correction unit makes the first correction cycle shorter than the second correction cycle.

  As a result, when the yarn thickness increases, the yarn thickness may change abruptly, so it is necessary to make corrections frequently by shortening the cycle. On the other hand, when the thread thickness decreases, the thread thickness changes gradually. However, the detection value (that is, the detected yarn thickness) of the yarn thickness detection unit also changes gradually even when the temperature changes. Therefore, when the thread thickness is reduced, the cycle is lengthened to determine whether the thread thickness is actually decreasing or whether the thread thickness appears to be decreasing due to the influence of temperature change. There is a need. When the thread thickness increases, the actual thread thickness basically changes abruptly, while the value detected by the thread thickness detection unit due to the temperature change changes relatively slowly as described above. To do. Accordingly, it is possible to easily (in a short time) distinguish whether the thread thickness actually increases or whether the thread thickness seems to increase due to the influence of temperature change. As described above, the thread thickness can be corrected at an appropriate timing according to the change in the thread thickness.

  The yarn monitoring device preferably has the following configuration. That is, the yarn monitoring device includes a yarn traveling length detection unit that detects a yarn traveling length that is a length of traveling of the yarn. The correction unit performs the first correction each time the yarn travels a first predetermined length based on the yarn travel length detected by the yarn travel length detection unit, and the yarn travels a second predetermined length. The second correction is performed every time.

  As a result, the correction timing is determined based on the yarn traveling length, so that the yarn thickness can be corrected more accurately than in the case where the correction timing is determined based on the time.

  In the yarn monitoring device, it is preferable that the correction unit performs the first correction every time a first predetermined time elapses and performs the second correction every time a second predetermined time elapses.

  As a result, the correction timing can be determined without detecting the yarn travel length, so that the processing can be simplified.

  In the yarn monitoring device, the correction unit calculates a value based on an average yarn thickness from the start of running of the yarn until the yarn runs for a predetermined length or until a predetermined time elapses. It is preferable to perform the first correction or the second correction based on the amount of increase or decrease from the yarn reference thickness.

  As a result, it is considered that the influence of the temperature change is small for a predetermined time after the running of the yarn starts, so the temperature change or the like can be obtained by using the average of the yarn thickness (yarn reference thickness) acquired during this period as a reference. Can be estimated accurately. Therefore, the yarn thickness can be corrected more accurately.

  According to the 2nd viewpoint of this invention, the yarn winding machine of the following structures is provided. That is, the yarn winding machine includes a winding unit, a yarn thickness detection unit, and a correction unit. The winding unit winds a yarn to form a package. The thread thickness detection unit detects the thread thickness of the traveling thread. The correction unit includes a first correction that corrects the yarn thickness at a predetermined cycle based on an increase amount of the yarn thickness detected by the yarn thickness detection unit, and a yarn that is detected by the yarn thickness detection unit. Based on the thickness reduction amount, a second correction for correcting the thread thickness at a different period from the first correction is performed.

  As a result, when the thread thickness increases and decreases, the behavior of the change in the thread thickness is different. Therefore, by setting a cycle according to them, the thread can be processed at an appropriate timing according to the change in the thread thickness. Thickness can be corrected.

  The automatic winder preferably has the following configuration. That is, the automatic winder includes a yarn traveling length detection unit that detects a yarn traveling length, which is the length that the yarn has traveled. The winding unit winds the yarn while changing the winding speed at least temporarily. The correction unit performs the first correction each time the yarn travels a first predetermined length based on the yarn travel length detected by the yarn travel length detection unit, and the yarn travels a second predetermined length. The second correction is performed every time.

  Thus, even in an automatic winder that winds a yarn while changing the winding speed, the yarn thickness can be corrected at an appropriate timing by performing correction based on the yarn traveling length.

The front view which shows the whole structure of an automatic winder provided with the thread | yarn monitoring apparatus which concerns on one Embodiment of this invention. The side view of a winder unit provided with a yarn monitoring device. The block diagram which shows the electric constitution of a thread | yarn monitoring apparatus. The graph which shows the relationship between the yarn travel length and the voltage (thread thickness) of the electric signal. The graph which shows the relationship between thread | yarn running length, thread | yarn thickness, and correction amount. The flowchart which shows the first half of the process which correct | amends yarn thickness in consideration of the temperature change etc. during the driving | running | working of a yarn. The flowchart which shows the second half of the process which correct | amends yarn thickness in consideration of the temperature change etc. during the driving | running | working of a yarn.

  Next, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, an automatic winder (yarn winding machine) 1 includes a plurality of winder units (yarn winding units) 10 arranged side by side, and a machine base control unit 11 arranged at one end in the arranged direction. Is mainly provided.

  The machine base control unit 11 includes a display device 12 that can display information regarding each winder unit 10, an instruction input unit 13 for an operator to input various instructions to the machine base control unit 11, and the like. . The operator of the automatic winder 1 checks various displays displayed on the display device 12 and manages the plurality of winder units 10 collectively in the machine base control unit 11 by appropriately operating the instruction input unit 13. be able to.

  Each winder unit 10 shown in FIGS. 1 and 2 is configured to unwind the yarn from the yarn supplying bobbin 20 and wind it back to the winding bobbin 22. A state in which the yarn 21 is wound around the winding bobbin 22 is referred to as a package 23. In the following description, “upstream side in the yarn traveling direction” and “downstream side in the yarn traveling direction” mean the upstream side and the downstream side when viewed in the traveling direction of the yarn 21, respectively.

  As shown in FIG. 2, the winder unit 10 mainly includes a main body frame 24, a yarn supplying unit 25, and a winding unit 26.

  The main body frame 24 is disposed on the side of the winder unit 10. Most of the configuration of the winder unit 10 is supported directly or indirectly by the main body frame 24.

  The yarn supplying section 25 is configured to be able to hold the yarn supplying bobbin 20 for supplying the yarn 21 in a substantially upright state. The winding unit 26 includes a cradle 28 and a winding drum 29.

  The cradle 28 rotatably supports the take-up bobbin 22. The cradle 28 is configured so that the peripheral surface of the supported winding bobbin 22 can be brought into contact with the peripheral surface of the winding drum 29. The take-up drum 29 is disposed so as to face the take-up bobbin 22 and is configured to be rotationally driven by a take-up drum drive motor (not shown). A reciprocating spiral traverse groove (not shown) for traversing the yarn 21 wound around the winding bobbin 22 is formed on the outer peripheral surface of the winding drum 29.

  The winding bobbin 22 is driven to rotate by rotating the winding drum 29 while the outer peripheral surface of the winding bobbin 22 is in contact with the winding drum 29. Thereby, the yarn 21 unwound from the yarn supplying bobbin 20 can be wound around the winding bobbin 22 while traversing the traverse groove. The configuration for traversing the yarn 21 is not limited to the winding drum 29 described above. For example, instead of this, an arm-type traverse device that guides the yarn 21 by a traverse guide that is reciprocally driven with a predetermined traverse width. You may comprise by. When the arm-type traverse device is used, the take-up bobbin 22 is preferably driven to rotate directly.

  Each winder unit 10 includes a unit controller 30. The unit control unit 30 includes hardware such as a CPU, ROM, and RAM, and software such as a control program stored in the ROM or RAM. The hardware and software cooperate to control each configuration of the winder unit 10. The unit control unit 30 of each winder unit 10 is configured to be able to communicate with the machine base control unit 11. As a result, the operation of each winder unit 10 can be centrally managed by the machine control unit 11.

  Further, the winder unit 10 includes, in order from the upstream side in the yarn traveling direction, in the yarn traveling path between the yarn supplying unit 25 and the winding unit 26, the unwinding assisting device 31, the tension applying device 32, and the yarn joining device. 33 and the yarn monitoring device 6 are arranged.

  The unwinding assisting device 31 has a regulating member 35 that comes into contact with a portion (balloon) swelled outward by the yarn 21 unwound from the yarn feeding bobbin 20 being swung by centrifugal force. By restricting the yarn 21 from being excessively swung by bringing the regulating member 35 into contact with the balloon, the yarn 21 from the yarn feeding bobbin 20 is unwound by keeping the balloon at a certain size. Can be done.

  The tension applying device 32 applies a predetermined tension to the traveling yarn 21. As the tension applying device 32 of the present embodiment, a gate type device is used in which movable comb teeth are arranged with respect to fixed comb teeth. The tension applying device 32 applies an appropriate tension to the yarn 21 by allowing the yarn 21 to pass while bending between the interdigitated comb teeth. For the tension applying device 32, for example, a disc type device can be adopted in addition to the gate type device as described above.

  When the yarn 21 between the yarn feeding bobbin 20 and the take-up bobbin 22 is cut by, for example, a cutting device (cutter) 16 described later, the yarn joining device 33 is in a divided state. The 20-side yarn (lower yarn) and the winding bobbin 22-side yarn (upper yarn) are joined (yarn spliced). The configuration of the yarn joining device 33 is not particularly limited. For example, an air-type splicer that twists yarn ends together by a swirling airflow generated by compressed air can be used, or a mechanical knotter or the like can be used. You can also. The upper yarn suction pipe 44 sucks and catches the yarn end on the winding bobbin 22 side and guides it to the yarn joining device 33. The lower thread suction pipe 45 sucks and captures the yarn end on the yarn feeding bobbin 20 side and guides it to the yarn joining device 33.

  The yarn monitoring device 6 monitors the state of the traveling yarn 21 (thickness, mixing of foreign matters such as colored yarn and polypropylene), and detects a yarn defect contained in the yarn 21. The yarn monitoring device 6 can detect the yarn traveling speed of the traveling yarn 21. The yarn monitoring device 6 incorporates a cutter 16 for cutting the yarn 21 when the yarn monitoring device 6 detects a yarn defect. The detailed configuration of the yarn monitoring device 6 will be described later.

  Next, an operation when a yarn defect or the like is detected by the yarn monitoring device 6 will be briefly described with reference to FIG.

  When the yarn monitoring device 6 detects a yarn defect or the like in the monitored yarn, the yarn monitoring device 6 operates the cutter 16 to cut the yarn 21 and transmits a yarn defect detection signal to the unit control unit 30 described above. The yarn 21 on the downstream side of the cut portion is once wound around the package 23. At this time, the yarn 21 wound around the package 23 includes a portion such as a yarn defect detected by the yarn monitoring device 6. The unit control unit 30 stops the winding of the yarn 21 in the winding unit 26 after receiving the yarn defect detection signal.

  The lower yarn suction pipe 45 sucks and captures the yarn end fed from the yarn feeding bobbin 20 and guides it to the yarn joining device 33. Before and after this, the upper thread suction pipe 44 sucks and captures the thread end wound around the package 23 and guides it to the yarn joining device 33. At this time, a portion such as a yarn defect wound around the package 23 is sucked and pulled out by the upper yarn suction pipe 44.

  The yarn joining device 33 joins the yarn ends guided by the upper yarn suction pipe 44 and the lower yarn suction pipe 45. As a result, the yarn 21 cut by the cutter 16 becomes continuous again after the portion including the yarn defect or the like is removed.

  When the yarn joining operation in the yarn joining device 33 is completed, the unit control unit 30 resumes the winding of the yarn 21 by the winding unit 26. With the above operation, the yarn defect detected by the yarn monitoring device 6 can be removed, and the winding of the yarn 21 onto the package 23 can be resumed.

  In the present embodiment, the unit control unit 30 performs disturb control (periodic control) in order to prevent the occurrence of ribbon winding (the yarn 21 is wound so as to gather and overlap at the same location). Specifically, the unit control unit 30 controls the winding drum drive motor (not shown) to periodically change the rotation speed of the winding drum 29 to slide the package 23 and the winding drum 29. Then, change the winding speed. Therefore, in this embodiment, the yarn traveling speed of the yarn 21 is not constant. Further, since the package 23 and the winding drum 29 slip, even when the rotational speed of the winding drum 29 is used, an accurate yarn traveling speed cannot be detected. Even when the disturb control is not performed, the yarn traveling speed is not constant. For example, in the case of forming a cone-shaped package, the yarn traveling speed changes significantly depending on whether the yarn is wound around the large diameter side of the package or the yarn is wound around the small diameter side of the package. It is difficult to detect an accurate yarn traveling speed based only on the speed.

  Next, with reference to FIG. 3, details of the yarn monitoring device 6, particularly the electrical configuration, will be described. FIG. 3 is a block diagram showing an electrical configuration of the yarn monitoring device 6.

  As shown in FIG. 3, the yarn monitoring device 6 includes an optical sensor unit (yarn thickness detecting unit) 50 and a yarn monitoring control unit 60.

  The sensor unit 50 can measure the state of the thread 21. The sensor unit 50 includes a drive circuit 51, a light projecting unit 52, a light receiving unit 53, an amplifier 54, a high-pass filter 55, and an amplifier circuit 56. The cutter 16 is attached to the housing of the sensor unit 50. In the present embodiment, a total of two sets of the light projecting unit 52 and the light receiving unit 53 are arranged one by one at different positions on the yarn traveling path. That is, the light projecting unit 52 includes a first light projecting unit disposed on the upstream side of the yarn traveling path and a second light projecting unit disposed on the downstream side. Further, the light receiving unit 53 includes a first light receiving unit disposed on the upstream side of the yarn traveling path and a second light receiving unit disposed on the downstream side.

  The light projecting unit 52 includes a light emitting element formed of a light emitting diode (LED). The light projecting unit 52 irradiates light to the space (slit-shaped recess in FIG. 3) in which the yarn 21 travels with a light amount corresponding to the 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 controller 60.

  The light receiving unit 53 is disposed on the opposite side of the light projecting unit 52 across the yarn path. The light receiving unit 53 includes a light receiving element formed of a photodiode or the like. The light receiving unit 53 receives the transmitted light of the light emitted from the light projecting unit 52 to the yarn 21 and outputs an electric signal (output voltage or output current) corresponding to the amount of received light. This electrical signal changes according to the shape (cross-sectional shape) of the yarn 21 existing in the detection region 70. The transmitted light here is light that has reached the light receiving unit 53 while being partly blocked by the presence of the thread 21 from the light projecting unit 52. In other words, the transmitted light is light that has passed through the yarn 21. The detection area 70 is an area where light from the light projecting unit 52 strikes in the slit-shaped recess, and is an area where the yarn 21 can be detected according to the amount of light received by the light receiving unit 53.

  The electric signal output from the light receiving unit 53 is amplified by the amplifier 54 and subjected to inversion processing. As a result, the electrical signal output from the amplifier 54 is converted to be smaller as the amount of light received by the light receiving portion 53 is larger (that is, as the yarn 21 is thinner). The electrical signal output from the amplifier 54 is extracted by a high-pass filter 55 and a signal having a predetermined high frequency is amplified by the amplifier circuit 56 again. The sensor unit 50 detects the thickness of the thread 21 as described above. The sensor unit 50 outputs an electric signal indicating the detection result of the yarn thickness to the yarn monitoring controller 60.

  The yarn monitoring control unit 60 includes a yarn traveling length detection unit 61 and a correction unit 62. The yarn traveling length detection unit 61 determines how much the electrical signal output from one light receiving unit 53 is delayed from the electrical signal output from the other light receiving unit 53 based on uneven thickness of the yarn 21 and the like. By obtaining, the length (yarn running length) of the yarn 21 that has run through the detection region 70 is detected. The correction unit 62 corrects the thread thickness in consideration of changes in characteristics of the light projecting unit 52 and the light receiving unit 53 due to temperature changes (details will be described later). The sensor unit 50 and the yarn monitoring controller 60 are provided for each automatic winder 1, and the yarn thickness is corrected for each automatic winder 1.

  The cutter 16 described above is disposed in the vicinity of the detection region 70 formed in the housing of the sensor unit 50. The cutter 16 includes a cutting blade (not shown) driven by, for example, a solenoid. The cutter 16 is electrically connected to the yarn monitoring controller 60 and can cut the yarn 21 based on a cutting signal output from the yarn monitoring controller 60.

  Next, correction performed by the correction unit 62 of the yarn monitoring device 6 will be described with reference to FIGS. FIG. 4 is a graph showing the relationship between the yarn travel length and the voltage (yarn thickness) of the electrical signal. FIG. 5 is a graph showing the relationship between the yarn travel length, the yarn thickness, and the correction amount.

  In the graph of FIG. 4, the horizontal axis represents the yarn traveling length, and the vertical axis represents the voltage of the electric signal (that is, the yarn thickness) input from the sensor unit 50 to the yarn monitoring controller 60. Hereinafter, this graph will be described in time series. When the yarn traveling length is at the left end, it is before the winding of the yarn 21 is started, and the yarn 21 does not exist in the detection region 70. Therefore, the voltage at the time when the yarn traveling length is at the left end corresponds to the voltage (initial adjustment value in FIG. 5) output regardless of the presence or absence of the yarn 21.

  Thereafter, the upper yarn suction pipe 44 and the lower yarn suction pipe 45 guide the yarn end to the yarn joining device 33, whereby the yarn 21 is introduced into the detection region 70. In the graph of FIG. 4, after the yarn 21 is introduced into the detection region 70, the light is blocked by the yarn 21, so that the voltage of the electric signal increases. At this stage, since the yarn 21 is not running, the thickness of the yarn does not change, so the voltage of the electric signal is constant.

  Thereafter, after the yarn joining device 33 performs yarn joining, the traveling of the yarn 21 starts. In the graph of FIG. 4, the voltage of the electric signal changes due to uneven thickness of the yarn 21 after the start of the running of the yarn 21.

  The correction unit 62 determines the initial adjustment value based on the average yarn thickness (electric signal voltage) from when the yarn 21 starts to travel until the yarn 21 travels a predetermined length (25 m in this embodiment). "Thread standard thickness" which is a value obtained by subtracting is obtained (see FIG. 5). The yarn reference thickness may be obtained from the average yarn thickness from when the yarn 21 starts to run until a predetermined time elapses. It should be noted that the predetermined length and the predetermined time for obtaining the yarn reference thickness may be always constant, or values corresponding to the winding conditions (type of yarn 21, winding speed, etc.) may be used.

  The correction unit 62 obtains (calculates) the yarn average thickness after obtaining the yarn reference thickness. The average yarn thickness is the average (moving average) of the yarn thicknesses of the yarns 21 in the past predetermined length or predetermined time. The yarn average thickness is a value including an adjustment value, unlike the yarn reference thickness. In the present embodiment, the average yarn thickness of the past 25 m, which is the same as the yarn reference thickness, is defined as the yarn average thickness. The predetermined length or predetermined time when calculating the yarn reference thickness is preferably the same as the predetermined length or predetermined time when calculating the yarn average thickness, but may be different. Therefore, at the start of calculation of the yarn average thickness (L0 in FIG. 4), the yarn average thickness is equal to (thread reference thickness + initial adjustment value). In the present embodiment, the correction unit 62 updates the yarn average thickness every time the yarn 21 travels 5 m.

  Further, the correction unit 62 starts correcting the thread thickness after the calculation of the average thread thickness is started. Hereinafter, the correction performed by the correction unit 62 will be described with reference to FIGS. 6 and 7. 6 and 7 are flowcharts showing a process of correcting the yarn thickness in consideration of a temperature change during running of the yarn.

  First, the correction unit 62 acquires the yarn traveling length detected by the yarn traveling length detection unit 61 (S101). Next, the correction unit 62 stands by until the acquired yarn traveling length becomes an integral multiple of the first predetermined length (5 m) (S102). The first predetermined length is a cycle for correcting the yarn thickness when the detected yarn thickness increases (including the case where the voltage of the electric signal increases due to temperature change) (hereinafter referred to as the first correction). is there. In other words, the correction unit 62 determines whether or not to perform the first correction every time the yarn 21 travels for the first predetermined length. The period of the first correction is not limited to the yarn traveling length, and may be performed every predetermined time (first predetermined time).

  When the yarn traveling length becomes an integer multiple (5, 10, 15, etc.) of the first predetermined length, the correction unit 62 obtains the yarn average thickness as described above, and the yarn average thickness is one cycle before ( That is, it is determined whether or not it is larger than the average yarn thickness of 5 m before (S103). If the average yarn thickness before one cycle does not exist or is 0 (for example, immediately after the running of the yarn 21 is started), the average yarn thickness obtained this time is stored, and the process is terminated.

  When the yarn average thickness obtained this time is larger than the yarn average thickness one cycle before, the correction unit 62 turns on the first correction execution flag (S104), and proceeds to the next processing. In addition, the correction | amendment part 62 transfers to the following process, without setting a 1st correction flag, when the thread | yarn average thickness calculated | required this time is below the thread average thickness of 1 period previous.

  Next, the correcting unit 62 determines whether or not the acquired yarn traveling length has reached the second predetermined length (35 m) (S105). The second predetermined length is a cycle for correcting the yarn thickness (hereinafter, referred to as second correction) when the yarn thickness is reduced (including the case where the voltage of the electric signal is reduced due to a temperature change). In other words, the correction unit 62 determines whether or not to perform the second correction every time the yarn 21 travels for the second predetermined length. The period of the second correction is not limited to the yarn travel length, and may be performed every predetermined time (second predetermined time).

  When the yarn traveling length has reached (exceeded) the second predetermined length, the correction unit 62 determines whether the yarn average thickness obtained this time is smaller than the yarn average thickness one cycle before (that is, 35 m before). It is determined whether or not (S106). When the average thread thickness obtained this time is smaller than the average thread thickness of the previous cycle, the correction unit 62 turns on the second correction execution flag (S107), and proceeds to the next process. If the average thread thickness obtained this time is larger than the average thread thickness one cycle before, the correction unit 62 proceeds to the next process without turning on the second correction flag.

  Next, the correction | amendment part 62 clears the value of thread | yarn running length, when it makes judgment of S106 (S108). Thereby, the yarn traveling length is counted again from zero.

  Next, the correction unit 62 determines whether or not the first correction execution flag or the second correction execution flag is turned on (S109 in FIG. 7). The correction part 62 complete | finishes a process, when neither correction execution flag is set to ON. When any of the correction execution flags is ON, the correction unit 62 acquires the yarn reference thickness obtained when the yarn 21 starts to travel (S110).

  Next, the correction unit 62 calculates a new correction amount (S111). Specifically, as shown in FIG. 5, the correction adjustment value is calculated by subtracting the thread reference thickness from the thread average thickness obtained this time. Describing this calculation, the yarn reference thickness is obtained in a situation where there is little influence of temperature change and the like, and therefore the yarn thickness is shown almost accurately. Therefore, by subtracting the yarn reference thickness from the yarn average thickness, it is possible to calculate an adjustment value (correction adjustment value) that takes into account the influence of the current temperature change or the change in the fiber amount of the yarn 21 or the like. Further, the voltage fluctuation amount (correction amount) due to the influence of temperature change or the change in the fiber amount of the yarn 21 can be obtained by subtracting the initial adjustment value from this correction adjustment value. In the example shown in FIG. 5, the correction amount is positive, but may be negative depending on the situation.

  After the above calculation, the correction unit 62 determines whether or not the absolute value of the correction amount is greater than a predetermined threshold (S112). When the absolute value of the correction amount is larger than the predetermined threshold, the correction unit 62 determines that the change amount of the detection value due to the influence of the temperature change is large and the influence on the gain becomes too large, and operates the cutter 16. Then, the thread 21 is cut (S113).

  On the other hand, when the absolute value of the correction amount is equal to or smaller than the predetermined threshold, the correction unit 62 corrects the thread thickness based on the calculated correction amount (S114). Accordingly, when the first correction execution flag is ON, the first correction is performed. For example, when the yarn travel length in FIG. 5 is from 0 m to 35 m (the first count), the average yarn thickness gradually increases as compared to 5 m before, so every first predetermined length (every 5 m). B) The correction amount is corrected. Further, when the second correction execution flag is ON, the second correction is performed. For example, when the yarn travel length in FIG. 5 is 35 m (second and third counts), the average yarn thickness is reduced compared to before 35 m, so the correction amount is corrected. When both the first correction execution flag and the second correction execution flag are ON, any predetermined correction is performed.

  As described above, in this embodiment, when the detected increase amount of the yarn thickness is greater than or equal to a predetermined value (when the first correction is performed), and when the detected decrease amount of the yarn thickness is equal to or greater than the predetermined value (the second correction is performed). And the period for performing the necessity of correction are different. This is due to the following reason. That is, the case where the yarn thickness increases may be a situation where the yarn 21 is tangled with the yarn 21 when the yarn 21 is generated. In this situation, the yarn thickness increases rapidly. On the other hand, when the yarn thickness increases due to the influence of temperature change, the detection value of the sensor unit 50 (that is, the detected yarn thickness) changes gradually. Therefore, it can be distinguished in a short time whether the thread thickness actually increases or whether the thread thickness seems to increase due to the influence of temperature change. Therefore, it can be frequently determined (with a shorter cycle) whether the yarn thickness has increased. On the other hand, the case where the thread thickness decreases may be a situation in which the fibers contained in the thread 21 are removed little by little at the stage of generating the thread 21, and in this situation, the thread thickness is gradually reduced. Become. On the other hand, also when the yarn thickness is reduced due to the influence of the temperature change, the detection value of the sensor unit 50 (that is, the detected yarn thickness) changes gradually. Therefore, when the thread thickness is reduced, the cycle is lengthened to determine whether the thread thickness is actually decreasing or whether the thread thickness appears to be decreasing due to the influence of temperature change. There is a need. Considering the above, in the present embodiment, the first correction cycle is shorter than the second correction cycle.

  Note that, as shown in FIG. 4, when a yarn separation (yarn breakage or yarn cut by a cutter) occurs after the start of correction, the initial adjustment value is corrected. In addition, the average length of the yarn can be calculated by running a length (25 m in this embodiment) corresponding to the calculation of the yarn reference length from the start of running of the yarn 21. Therefore, the yarn thickness correction is resumed at this timing.

  As described above, the yarn monitoring device 6 of the present embodiment includes the optical sensor unit 50 and the correction unit 62. The sensor unit 50 detects the thickness of the traveling yarn 21. Based on the increase in the yarn thickness detected by the sensor unit 50, the correction unit 62 detects a first correction that corrects the yarn thickness at a predetermined cycle (when correction is necessary), and the sensor unit 50 detects Based on the reduced amount of thread thickness, a second correction is performed to correct the thread thickness at a different period from the first correction (when correction is necessary).

  Thereby, when the yarn thickness increases and when the yarn thickness decreases, the behavior of the change in the yarn thickness is different, so by setting the period according to them, considering the temperature change during traveling of the yarn, The thread thickness can be corrected at an appropriate timing according to the change in the thread thickness.

  Further, the yarn monitoring device 6 of the present embodiment includes a yarn traveling length detection unit 61 that detects a yarn traveling length that is the length that the yarn 21 has traveled. The correction unit 62 performs the first correction every time the yarn 21 travels the first predetermined length based on the yarn travel length detected by the yarn travel length detection unit 61, and the yarn 21 travels the second predetermined length. The second correction is performed every time.

  As a result, the correction timing is determined based on the yarn traveling length, so that the yarn thickness can be corrected more accurately than in the case where the correction timing is determined based on the time.

  Further, in the yarn monitoring device 6 of the present embodiment, the correction unit 62 determines a value based on an average of the yarn thicknesses from when the yarn 21 starts running until the yarn 21 runs a predetermined length. The first correction or the second correction is performed based on the increase amount or the decrease amount from the yarn reference thickness.

  Thereby, since it is considered that the influence of the temperature change is small for a predetermined time after the running of the yarn 21 starts, the temperature change can be obtained by using the average of the yarn thickness (yarn reference thickness) acquired during this time as a reference. Etc. can be accurately estimated. Therefore, the yarn thickness can be corrected more accurately.

  In the present embodiment, the winding unit 26 winds the yarn 21 while changing the winding speed at least temporarily in order to perform disturb control. The correction unit 62 performs the first correction every time the yarn 21 travels the first predetermined length based on the yarn travel length detected by the yarn travel length detection unit 61, and the yarn 21 travels the second predetermined length. The second correction is performed every time.

  Thus, even in an automatic winder that winds the yarn 21 while changing the winding speed, the yarn thickness can be corrected at an appropriate timing by performing the correction based on the yarn traveling length.

  The preferred embodiment of the present invention has been described above, but the above configuration can be modified as follows, for example.

  In the above embodiment, since the yarn monitoring device 6 reverses the voltage by the amplifier circuit 56, the larger the voltage of the electric signal input to the yarn monitoring control unit 60, the thicker the yarn, but the voltage is not reversed. It may be a configuration. In this case, the correction when the voltage of the electrical signal input to the yarn monitoring control unit 60 becomes small (that is, when the yarn thickness increases) corresponds to the first correction.

  In the above embodiment, the yarn monitoring device 6 is configured to include the cutter 16. However, the present invention is not limited thereto, and the cutter may be arranged outside the yarn monitoring device 6 and controlled by the unit control unit 30. In this case, the yarn monitoring control unit 60 outputs a yarn cutting signal to the unit control unit 30, and the unit control unit 30 drives the cutter based on the yarn cutting signal. Further, the yarn monitoring device 6 is configured to cut the yarn 21 when the yarn defect is detected by the cutter 16 and to remove the yarn defect. However, the yarn monitoring device of the present invention cuts the yarn 21 by the cutter 16. A device that only monitors the state of the yarn 21 without using it may be used.

  In the above embodiment, the yarn monitoring device 6 includes the yarn thickness detection unit and the yarn travel length detection unit. However, the yarn thickness detection unit and the yarn travel length detection unit are realized by separate devices. May be. When the yarn monitoring device 6 does not include the yarn traveling length detection unit and detects the yarn traveling length (the traveling speed of the yarn 21) by a device different from the yarn monitoring device 6, the yarn monitoring device 6 has a set of throwing devices. The structure provided with the optical part and the light-receiving part may be sufficient.

  The yarn monitoring device 6 is not limited to a configuration in which a total of two sets of light projecting units and light receiving units are arranged one by one at different positions on the yarn traveling path. As described above, only one set of the light projecting unit and the light receiving unit may be provided. Moreover, even if it is a case where only one set of a light projection part and a light-receiving part is provided, or the case where it is provided with multiple sets, the number of the light projection parts arrange | positioned in one set and the number of light-receiving parts are limited to one each Not. For example, one set may include one or more light projecting units and one or more light receiving units. Specifically, the first group disposed on the upstream side includes one light projecting unit and three light receiving units, and the second group disposed on the downstream side includes two light projecting units and two. And two light receiving portions.

  In the above embodiment, the predetermined length for obtaining the yarn reference thickness is 25 m, the first correction cycle is 5 m, and the second correction cycle is 35 m. However, these values are arbitrary and are appropriately set. It can be changed (for example, it may be twice or three times the above). In the above-described embodiment, the predetermined length for obtaining the yarn reference thickness and the second correction period are integer multiples of the first correction period, but may not be integral multiples.

  The processing described in the above flowchart is an example, and addition, change, order change, deletion, and the like of the flow can be performed without departing from the present invention.

  In the above embodiment, the first correction cycle is shorter than the second correction cycle, but the first correction cycle may be longer than the second correction cycle depending on the winding condition and the like.

  In the above embodiment, the calculation is performed by introducing values such as the thread reference thickness, the thread average thickness, the initial adjustment value, the correction adjustment value, and the correction amount. However, this calculation is an example and can be changed as appropriate. . For example, the calculation may be performed by regarding the value obtained by adding the initial adjustment value to the thread reference thickness in the above embodiment as the “thread reference thickness”.

  The unit control unit 30 or the machine base control unit 11 may perform at least a part of the processing (for example, correction performed by the correction unit 62) performed by the yarn monitoring control unit 60.

  The configuration of the present invention is not limited to an automatic winder, and can also be applied to other yarn winding machines such as a winding machine and a spinning machine (pneumatic spinning machine, open-end spinning machine).

1 Automatic Winder 6 Yarn Monitoring Device 16 Cutter 50 Sensor Unit (Thread Thickness Detection Unit)
60 Yarn Monitoring Control Unit 61 Yarn Running Length Detection Unit 62 Correction Unit

Claims (7)

An optical thread thickness detector that detects the thread thickness of the traveling thread;
Based on the increase amount of the yarn thickness detected by the yarn thickness detection unit, a first correction for correcting the yarn thickness at a predetermined cycle, and a reduction amount of the yarn thickness detected by the yarn thickness detection unit. A correction unit that performs a second correction for correcting the thread thickness at a different period from the first correction,
A yarn monitoring device comprising: The yarn monitoring device according to claim 1,
The yarn monitoring device, wherein the correction unit makes the first correction cycle shorter than the second correction cycle. The yarn monitoring device according to claim 1 or 2,
A yarn travel length detection unit that detects a yarn travel length that is the length traveled by the yarn,
The correction unit performs the first correction each time the yarn travels a first predetermined length based on the yarn travel length detected by the yarn travel length detection unit, and the yarn travels a second predetermined length. A yarn monitoring device that performs the second correction every time. The yarn monitoring device according to claim 1 or 2,
The yarn monitoring apparatus, wherein the correction unit performs the first correction every time a first predetermined time elapses and performs the second correction every time a second predetermined time elapses. The yarn monitoring device according to any one of claims 1 to 4, wherein
The correction unit obtains a value based on an average of the yarn thicknesses from the start of running of the yarn until the yarn runs for a predetermined length or until a predetermined time elapses, as the yarn reference thickness, A yarn monitoring device that performs the first correction or the second correction based on an increase amount or a decrease amount. A winding unit for winding a yarn to form a package;
A thread thickness detector for detecting the thickness of the traveling thread;
Based on the increase amount of the yarn thickness detected by the yarn thickness detection unit, a first correction for correcting the yarn thickness at a predetermined cycle, and a reduction amount of the yarn thickness detected by the yarn thickness detection unit. A correction unit that performs a second correction for correcting the thread thickness at a different period from the first correction,
A yarn winding machine comprising: An automatic winder as a yarn winding machine according to claim 6,
A yarn travel length detection unit that detects a yarn travel length that is the length traveled by the yarn,
The winding unit winds the yarn while changing the winding speed at least temporarily,
The correction unit performs the first correction each time the yarn travels a first predetermined length based on the yarn travel length detected by the yarn travel length detection unit, and the yarn travels a second predetermined length. An automatic winder that performs the second correction every time.

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