JP2004183137A - System for analyzing yarn unevenness information for spinning machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for analyzing yarn unevenness information for a spinning machine enabling yarn unevenness to be accurately evaluated and roller maloperation to be specified in high accuracy. <P>SOLUTION: In the system for analyzing yarn uneven 100 works as follows: A spun yarn 4 produced by the spinning machine 1 including a draft unit 10 functioning to draft a sliver 14 and feed the drafted sliver out of a front roller 13 is converted to a yarn unevenness signal by a slub catcher 101, the signal is then outputted as a power spectrum for each frequency component via a frequency analyzer 150; and based on a frequency zone corresponding to a fundamental wave frequency corresponding to a single rotation of the front roller 13 calculated by a roller rotation frequency calculation section 130 and one or more harmonic frequencies two or more natural times the fundamental wave frequency, if the power spectrum divided at a roller rotation frequency component detector 141 is greater than a specified threshold, a judgement section 142 judges that there is a defect in the front roller 13. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a yarn unevenness information analysis device for a spinning machine including a plurality of roller pairs, which includes a draft device for drafting a sliver and sending the sliver to a spinning unit.In particular, the quality of the rollers constituting the roller pair is accurately determined. Regarding what can be determined.
[0002]
[Prior art]
The spinning machine is composed of a number of spinning units. In this spinning unit, a sliver is drafted by a draft device including a back roller, a second roller around which an apron is wound, and a front roller, and a spun yarn is generated by a swirling flow in a pneumatic spinning nozzle. The generated yarn is wound into a package via a yarn feed roller. A yarn unevenness detector called a slab catcher including a light emitting diode and a phototransistor is provided downstream of the yarn feeding roller to detect yarn unevenness.
[0003]
Conventionally, yarn unevenness is detected by a slab catcher by subjecting a signal from a phototransistor to A / D conversion processing, analyzing a spectrum of a digitized signal by a Fourier transformer, integrating the operation result for each frequency component, When a power spectrum in a frequency band corresponding to one rotation of a roller constituting the draft device exceeds a predetermined threshold value, it is determined that the roller (for example, a front roller) is defective (Japanese Patent Application Laid-Open No. H10-163873). , Patent Document 2).
[0004]
[Patent Document 1]
Japanese Patent Publication No. 2-29771 (refer to claim 1)
[Patent Document 2]
JP-A-8-188931 (see paragraphs 0003-0005)
[0005]
[Problems to be solved by the invention]
However, the roller failure of the draft device due to the yarn unevenness detection described above is detected only when the power spectrum in the band of the fundamental frequency corresponding to one rotation of the roller exceeds a certain level. If the power spectrum appears beyond a certain level in a frequency region exceeding the threshold value, there is a problem that the roller is not specified as a defective roller.
[0006]
This is because, as a result of various experiments, the present inventors have found that, as a defect of the rollers of the draft device, a power spectrum exceeding a certain level appears not from the fundamental frequency band but from beyond the fundamental frequency band. Based on the finding that the present invention has been made, the present invention has been completed.
That is, an object of the present invention is to solve the above problems, and to provide a yarn unevenness information analyzing apparatus for a spinning machine capable of accurately evaluating yarn unevenness and accurately identifying a roller defect.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a yarn unevenness information analyzing device for a spinning machine according to claim 1 is configured by a plurality of roller pairs, and includes a draft device for drafting a sliver and sending the sliver to a spinning unit. In the analyzing device, the draft device, a yarn unevenness detector that detects a yarn unevenness signal generated through the spinning unit, and a spectrum analysis by processing the yarn unevenness signal, and outputs a power spectrum for each frequency component Frequency analysis means, a fundamental frequency corresponding to one rotation of the rollers constituting the roller pair, and a roller rotation frequency for calculating one or a plurality of harmonic frequencies that are two or more natural numbers times the fundamental frequency. From the power spectrum for each frequency component obtained by the calculating means and the frequency analyzing means, the fundamental frequency and the one or more harmonic frequencies are corresponded. Roller rotation frequency component detection means for detecting the power spectrum of each frequency band, and determination means for determining the quality of the roller based on the power spectrum detected by the roller rotation frequency component detection means. And
[0008]
According to the first aspect, the quality of the roller is determined based on the power spectrum of the frequency band corresponding to the fundamental frequency and the power spectrum of the frequency band corresponding to one or more harmonic frequencies. Therefore, it is possible to accurately detect a roller failure based on a periodic unevenness that occurs in a frequency band corresponding to the fundamental frequency or a frequency band corresponding to one or more harmonic frequencies.
[0009]
The yarn unevenness information analysis device for a spinning machine according to claim 2, wherein the yarn unevenness information analysis device for a spinning machine according to claim 1, wherein the determining unit detects the power detected in a frequency band corresponding to the fundamental wave frequency. First comparing means for comparing a spectrum with a preset first threshold value; and a power spectrum detected in a frequency band corresponding to the one or more harmonic frequencies corresponding to the one or more frequency bands. And a second comparing means for comparing with a set threshold value, wherein the pass / fail of the roller is determined from each comparison result of the first comparing means and the second comparing means.
[0010]
According to the second aspect, the comparison of the power spectrum of the frequency band corresponding to the fundamental frequency and the comparison of the power spectrum of the frequency band corresponding to one or more harmonic frequencies are separately performed. Therefore, the periodic spots generated at the fundamental frequency or at one or more harmonic frequencies can be accurately determined in accordance with the tendency, and roller failure can be detected with high accuracy.
[0011]
The yarn unevenness information analyzing device for a spinning machine according to claim 3, wherein the yarn unevenness information analyzing device for a spinning machine according to claim 1, wherein the determining unit detects the power detected in a frequency band corresponding to the fundamental wave frequency. And a sum value comparing means for summing the spectrum and a power spectrum detected in a frequency band corresponding to the one or more harmonic frequencies, and comparing the sum with a preset threshold value. The quality of the roller is determined based on the comparison result of the sum value comparing means.
[0012]
According to the third aspect, the comparison is made with respect to the total sum of the power spectrum of the frequency band corresponding to the fundamental frequency and the power spectrum of the frequency band corresponding to one or more harmonic frequencies. Therefore, by judging together the periodic unevenness occurring at the fundamental frequency and at one or more harmonic frequencies, it is possible to detect the roller failure easily and more accurately.
[0013]
The yarn unevenness information analysis device for a spinning machine according to claim 4, wherein the yarn unevenness information analysis device for a spinning machine according to claim 1, wherein the determining unit detects the power detected in a frequency band corresponding to the fundamental wave frequency. First comparing means for comparing a spectrum with a preset first threshold value; and a power spectrum detected in a frequency band corresponding to the one or more harmonic frequencies corresponding to the one or more frequency bands. A second comparing means for comparing with a set threshold, a power spectrum detected in a frequency band corresponding to the fundamental frequency, and a power spectrum detected in a frequency band corresponding to the one or more harmonic frequencies. A sum value comparing means for summing and comparing the sum value of the power spectrum with a preset threshold value, wherein the first comparing means, the second comparing means, and the sum value ratio From each comparison means, and judging the quality of the roller.
[0014]
According to claim 4, comparison of the power spectrum of the frequency band corresponding to the fundamental frequency, comparison of the power spectrum of the frequency band corresponding to one or more harmonic frequencies, and comparison of the power spectrum of the frequency band corresponding to the fundamental frequency The power spectrum and the comparison with the sum total of the power spectrums of the frequency bands corresponding to one or more harmonic frequencies are separately performed. Accordingly, the periodical unevenness occurring at the fundamental frequency or at one or more harmonic frequencies can be accurately determined according to the tendency, and at the fundamental frequency and at one or more harmonic frequencies. By determining the periodic unevenness together, it is possible to detect a roller defect with higher accuracy.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0016]
First, an example of a spinning machine to which the yarn unevenness information analysis device for a spinning machine according to the present embodiment is attached will be described with reference to FIG. FIG. 1 is a schematic diagram illustrating an example of a draft device and a spinning unit of a pneumatic spinning machine to which the yarn unevenness information analyzing device of the spinning machine according to the present embodiment is attached. In this embodiment, an air spinning machine is used as the spinning machine. However, the spinning machine is not limited to this, and may be applied to a rotating body such as a ring spinning machine or an open-end spinning machine.
[0017]
As shown in FIG. 1, the pneumatic spinning machine 1 includes a large number of spinning units (weights), and each weight includes a spinning unit 2, a yarn feed roller 3, and a draft device 10. Further, the draft device 10 includes a back roller 11, a second roller 12 around which an apron 12 'is wound, and a front roller 13. The front roller 13 includes a pair of a front top roller 13a and a front bottom roller 13b. The front top roller 13a is formed of rubber, and the front bottom roller 13b is formed of steel.
The sliver 14 is drafted by being sent out in order of the back roller 11, the second roller 12, and the front roller 13, and is spun by the air jet in the spinning unit 2. The yarn 4 generated by passing through the spinning unit 2 is configured to be wound by a winding package (not shown) via a yarn feed roller 3.
A slab catcher (yarn unevenness detector) 101 of a yarn unevenness information analysis device 100 described later is provided downstream of the yarn feeding roller 3 of the air spinning machine 1.
[0018]
[First embodiment]
Next, a yarn unevenness information analysis device for a spinning machine according to the first embodiment will be described with reference to FIGS. FIG. 2 is a block diagram illustrating a yarn unevenness information analysis device of the spinning machine according to the first embodiment. FIG. 2A schematically illustrates the yarn unevenness information analysis device of the spinning machine according to the first embodiment. FIG. 4B is a block diagram illustrating a second comparison unit. FIG. 3 is a schematic diagram showing an example of a slab catcher (yarn unevenness detector). FIG. 4 is a graph showing an example of a frequency band corresponding to the fundamental frequency and a frequency band corresponding to the harmonic frequency.
[0019]
As shown in FIG. 2A, the yarn unevenness information analyzer 100 includes a slab catcher (yarn unevenness detector) 101, a low-pass filter 102, an amplifier 103, an A / D converter (A / D) 104, , A width calculator (OSC) 105, a calculator 110, a D / A converter (D / A) 106, a display (Display) 107, and an alarm circuit 108. It should be noted that the low-pass filter 102, the amplifier 103, the A / D converter 104, the oscillating device (OSC) 105, a window (Windows) 111 provided in the calculator 110, a Fourier transformer 112, and a vector synthesis unit The (Power Spectrum) 113 constitutes a frequency analysis unit (frequency analysis means) 150.
[0020]
As shown in FIG. 3, the slab catcher (yarn unevenness detector) 101 includes a light emitting diode 101a and a phototransistor 101b. The slab catcher 101 is a detector that detects the amount of light transmitted from the light emitting diode 101a by the phototransistor 101b and outputs the detected amount of light as an electrical displacement (yarn unevenness signal) between terminals. It is characterized by high responsiveness. Further, the yarn unevenness signal S from the slab catcher 101 is input to the low-pass filter 102.
It should be noted that a capacitance type slab catcher can be used as the yarn unevenness detector 101 instead of the photoelectric type slab catcher.
[0021]
Returning to FIG. 2A, the yarn unevenness signal S first passes through the low-pass filter 102, is input to the amplifier 103, and is amplified to a voltage level most suitable for A / D conversion processing in order to prevent aliasing. Then, after being input to the A / D converter 104, the analog signal is converted into a digital signal. The A / D converter 104 samples an input signal and converts it into a digital signal by an accurate width generator 105 that generates a data sampling time determined according to a frequency bandwidth to be analyzed. The yarn unevenness signal S is converted into a digital signal and input to the calculator 110.
[0022]
The calculator 110 includes a window 111, a Fourier transformer 112, a vector synthesis unit 113, a roller rotation frequency calculation unit (roller rotation frequency calculation unit) 130, and an output (Output) processing unit 140. I have.
[0023]
The yarn unevenness signal S input to the calculator 110 is first weighted in the window 111, and then sent to the Fourier transformer 112 for calculation. The calculated result is output to the vector synthesis unit 113 for each frequency component. The power spectrum is vector-synthesized and output as a power spectrum of each frequency component, and a roller rotation frequency component detection configured by a fundamental frequency component detection unit 141a and a harmonic frequency component detection unit 141b of an output processing unit 140 described later. Input to the unit 141.
[0024]
The roller rotation frequency calculator 130 includes a fundamental frequency calculator 131 and a harmonic frequency calculator 132. In the roller rotation frequency calculation unit 130, first, based on, for example, the roller diameter and the yarn speed (winding speed) of the front top roller 13a and the front bottom roller 13b input by the user from the input unit 120 such as a keyboard, a basic In the wave frequency calculation unit 131, a fundamental wave frequency which is a frequency corresponding to each circumference (one rotation) of the front top roller 13a and the front bottom roller 13b is calculated. .., 1 / n (１ ／, ３,...) Of the respective circumferential lengths of the front top roller 13a and the front bottom roller 13b. .., 1 / n rotation), that is, each harmonic frequency which is a frequency obtained by multiplying the fundamental frequency of each of the front top roller 13a and the front bottom roller 13b by a natural number of 2 or more. Is calculated.
For example, when detecting a double or triple frequency component as a harmonic frequency, the values input by the input unit 120 are the diameter (Ft) of the front top roller 13a = 30 mm and the diameter (Fb) of the front bottom roller 13b. = 32 mm and the winding speed = 350 m / min, the fundamental wave frequency of the front top roller 13a is (350 x 100/60) / (3.0 x π) = 62.00 Hz, and the fundamental wave of the front bottom roller 13b. The frequency is (350 × 100 ÷ 60) ÷ (3.2 × π) = 58.00 Hz. The harmonic frequency of the front top roller 13a is, for example, 123.75 Hz when it is twice the fundamental frequency, and 185.75 Hz when it is three times the fundamental frequency. The harmonic frequency of the front bottom roller 13b is, for example, The frequency is 116.00 Hz when the frequency is twice the fundamental frequency, and 174.00 Hz when the frequency is three times the fundamental frequency.
The fundamental frequency and the harmonic frequency calculated by the fundamental frequency calculating unit 131 and the harmonic frequency calculating unit 132 are respectively the fundamental frequency component detecting unit 141 and the harmonic frequency component of the output processing unit 140 described later. It is input to the detection unit 142.
[0025]
The output processing unit 140 includes a roller rotation frequency component detection unit (roller rotation frequency component detection unit) 141 and a determination unit (determination unit) 143. Here, the roller rotation frequency component detection unit 141 includes a fundamental frequency component detection unit 141a and a harmonic frequency component detection unit 141b.
[0026]
In the fundamental frequency component detection unit 141a, the power spectrum signal of each frequency component input from the vector synthesis unit 113 is input from the fundamental frequency calculation unit 131 so as to be suitable for analysis in the determination unit 143 described below. Divide by the frequency band corresponding to the fundamental frequency. Here, the frequency band corresponding to the fundamental wave frequency is determined in consideration of the roller diameter and its variation, the ease of slipping, and the like. That is, in consideration of the fact that the analysis result is output at a position deviated from the calculated frequency due to variations in the roller diameter and the ease of slipping, the frequency to be subjected to component detection has a width. I have to. Here, the variation in the roller diameter may be caused by buffing described later.
For example, when the values input by the input unit 120 are the diameter (Ft) of the front top roller 13a = 30 mm, the diameter (Fb) of the front bottom roller 13b = 32 mm, and the winding speed = 350 m / min, FIG. As described above, the frequency band corresponding to the fundamental wave frequency of the front top roller 13a is set to -2.5 Hz to +2 Hz (59.50 Hz to 64.00 Hz of the fundamental wave frequency 62.00 Hz: the fundamental wave frequency 62.00 Hz shown in FIG. 4). (1)), and the frequency band corresponding to the fundamental frequency of the front bottom roller 13b is -2 Hz to +1 Hz of the fundamental frequency of 58.00 Hz (56.00 Hz to 59.00 Hz: the fundamental wave shown in FIG. 4). (2) of frequency 58.00 Hz).
[0027]
In addition, the harmonic frequency component detection unit 141b inputs the power spectrum signal of each frequency component input from the vector synthesis unit 120 from the harmonic frequency calculation unit 132 so as to be suitable for analysis in the determination unit 142 described later. Is divided in a frequency band corresponding to one or a plurality of harmonic frequencies (in the present embodiment, two times, two times and three times). Here, the frequency band corresponding to the harmonic frequency is also determined in consideration of the roller diameter, slip, and the like, similarly to the frequency band corresponding to the above-described fundamental frequency.
For example, when the values input by the input unit 120 are the diameter (Ft) of the front top roller 13a = 30 mm, the diameter (Fb) of the front bottom roller 13b = 32 mm, and the winding speed = 350 m / min, FIG. As described above, the frequency band corresponding to the harmonic frequency of the front top roller 13a is shown in FIG. 4, for example, from −2.5 Hz to +2 Hz (121.25 Hz to 125.75 Hz) of the harmonic frequency (double) 123.75 Hz. Harmonic frequency (2 times) (1) of 123.75 Hz), Harmonic frequency (3 times) -2.5 Hz to +2 Hz of 185.75 Hz (183.25 Hz to 187.75 Hz: harmonic shown in FIG. 4) Frequency (3 times) 185.75 Hz ((1) portion), and the frequency band corresponding to the harmonic frequency of the front bottom roller 13b is defined as the harmonic frequency. Number (2 times) -2 Hz to +1 Hz of 116.00 Hz (114.00 Hz to 117.00 Hz: harmonic frequency (double) shown in FIG. 4 (2) portion of 116.00 Hz), harmonic frequency (3 times) 4) It is set to −2 Hz to +1 Hz of 174.00 Hz (172.00 Hz to 175.00 Hz: (2) portion of the harmonic frequency (3 times) 174.00 Hz shown in FIG. 4).
[0028]
The signals processed by the fundamental frequency component detection unit 141a and the harmonic frequency component detection unit 141b exit the calculator 110, are input to the D / A converter 106, are converted into analog values, and are then displayed. At 107, a spectrum graph is displayed. Then, the user can read the yarn unevenness based on the spectrum graph displayed on the display 107.
[0029]
The determining unit 142 includes a first comparing unit (first comparing unit) 143 and a second comparing unit (second comparing unit) 144.
[0030]
The first comparing unit 143 calculates a predetermined first threshold value input by the user from the input unit 120 such as a keyboard, and a power spectrum of a frequency band corresponding to the fundamental frequency detected by the fundamental frequency component detecting unit 141a. Then, the quality of the rollers (the front top roller 13a and the front bottom roller 13b) is determined. That is, when the power spectrum of the frequency band corresponding to the fundamental frequency of the front top roller 13a is larger than the predetermined first threshold value, it is determined that the front top roller 13a has a defect such as eccentricity or scratch. On the other hand, when the power spectrum of the frequency band corresponding to the fundamental wave frequency of the front bottom roller 13b is larger than the predetermined first threshold value, it is determined that the front bottom roller 13b has a defect such as eccentricity or a scratch. Note that the first threshold can be appropriately set by the user.
[0031]
The second comparing unit 144 includes a double frequency comparing unit 144a and a triple frequency comparing unit 144b, as shown in FIG. 2B. The second comparing unit 144 includes one or more predetermined thresholds (thresholds in the double frequency comparing unit 144a in the present embodiment, and three or more threshold values in the triple frequency comparing unit 144b input by the user from the input unit 120 such as a keyboard). (Two threshold values) and a power spectrum of a frequency band corresponding to one or a plurality of harmonic frequencies (two times and three times in this embodiment) detected by the harmonic frequency component detection unit 142, respectively. Then, the quality of the rollers (the front top roller 13a and the front bottom roller 13b) is determined. That is, in the case of the present embodiment, the power spectrum of the frequency band corresponding to the harmonic frequency (2 times) of the front top roller 13a is equal to the threshold value at the predetermined harmonic frequency (2 times) set in the double frequency comparing unit 144a. Or the power spectrum of the frequency band corresponding to the harmonic frequency (3 times) of the front top roller 13a is higher than the threshold value at the predetermined harmonic frequency (3 times) set in the triple frequency comparing unit 144b. Is larger, the double frequency comparing unit 144a and the triple frequency comparing unit 144b determine that the front top roller 13a has a defect such as eccentricity or a scratch. On the other hand, the power spectrum of the frequency band corresponding to the harmonic frequency of the front bottom roller 13b (2x) is larger than the threshold at the predetermined harmonic frequency (2x) set in the 2x frequency comparison unit 144a, or When the power spectrum of the frequency band corresponding to the harmonic frequency (3 times) of the front bottom roller 13b is larger than the threshold value at the predetermined harmonic frequency (3 times) set in the triple frequency comparing section 144b, The double frequency comparison unit 144a and the triple frequency comparison unit 144b determine that the front bottom roller 13b has a defect such as eccentricity or a scratch. Note that the second threshold can be appropriately set by the user.
[0032]
Returning to FIG. 2A, when the determining unit 142 (the first comparing unit 143 and the second comparing unit 144) determines that the front top roller 13a or the front bottom roller 13b is defective, the OR gate is used. After passing through 144 and performing processing such as issuing a signal to the warning circuit 108, the signal is directly displayed as a digital value on the display 107. As shown in FIG. 2A, the outputs from the first comparison unit 143 and the second comparison unit 144 pass through the OR gate 142a, and as shown in FIG. Since the outputs from the unit 144a and the triple frequency comparison unit 144b pass through the OR gate 142b, the comparison result of the first comparison unit 143, the double frequency comparison unit 144a of the second comparison unit 144, and the triple frequency comparison unit When it is determined that the front top roller 13a or the front bottom roller 13b is defective in any of the comparison results of 144b, that is, any one of the fundamental frequency, the harmonic frequency (2 times), and the harmonic frequency (3 times) When the power spectrum is larger than the corresponding threshold value, a process such as issuing a signal to the warning circuit 108 is performed, and then the display 107 is displayed. It is directly displayed as a digital value.
The front top roller 13a or the front bottom roller 13b determined to have a defect is replaced, or a roller made of rubber (the front top roller 13a in the present embodiment) is shaved by buffing and re-cut. used.
[0033]
The first threshold value of the first comparing unit 143 and the two threshold values of the double frequency comparing unit 144a and the triple frequency comparing unit 144b of the second comparing unit 144 are respectively two levels (the alarm level and the alarm level). It is desirable to provide a stop level (however, the stop level is set to be higher than the alarm level). That is, when the power spectrum of the frequency band corresponding to the fundamental frequency exceeds the first threshold value of the alarm level, or when the power spectrum of the frequency band corresponding to the harmonic frequency (double or triple) exceeds the threshold value of the alarm level. If it exceeds, process as described above. On the other hand, when the power spectrum of the frequency band corresponding to the fundamental frequency exceeds the first threshold value of the stop level which is equal to or higher than the alarm level, or the power spectrum of the frequency band corresponding to the harmonic frequency (double or triple) When the threshold value exceeds each threshold value of the stop level which is equal to or higher than the alarm level, for example, the operation of the weight is stopped. Thereby, the user can take measures according to the degree of the defect of the front roller 13.
[0034]
Further, in addition to the first comparison unit 143 and the second comparison unit 144, the determination unit 142 includes a frequency band other than the frequency band corresponding to the fundamental frequency and the frequency band corresponding to the harmonic frequency (for example, in FIG. , 0.5 Hz to 200 Hz (excluding the portions (1) and (2)), it is desirable to provide a comparison section for comparing the power spectrum with a threshold value set separately. That is, the comparison unit for the frequency band excluding (1) and (2) is configured to determine the periodic spots other than the front roller 13. Thus, the abnormality of the power spectrum generated in the frequency band corresponding to the harmonic frequency is not erroneously detected as a yarn unevenness abnormality other than the failure of the front roller 13, but is correctly determined as the periodic unevenness due to the failure of the front roller 13. And yarn unevenness can be accurately evaluated.
[0035]
As described above, according to the yarn unevenness information analysis device 100 of the spinning machine 1 of the first embodiment, the comparison of the frequency components in the frequency band corresponding to the fundamental frequency and the response to the double and triple harmonic frequencies The comparison of the frequency components of the frequency bands to be performed is separately performed in the comparison in the first comparison unit 143 and the two comparisons in the second comparison unit 144, respectively. Therefore, the first threshold value, the harmonic frequency (2 times), and the harmonic frequency (3 times) are separately provided in the double frequency comparing unit 144a and the triple frequency comparing unit 144b of the first comparing unit 143 and the second comparing unit 144, respectively. Times), the periodic spots generated at the fundamental frequency or at the double and triple harmonic frequencies can be accurately determined in accordance with the tendency, and the roller can be accurately determined. Defects can be detected.
[0036]
[Second embodiment]
Next, a yarn unevenness information analysis device for a spinning machine according to a second embodiment will be described with reference to FIG. FIG. 5 is a block diagram showing a yarn unevenness information analysis device for a spinning machine according to the second embodiment. Note that the same members as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0037]
As shown in FIG. 5, the yarn unevenness information analysis device 200 includes a determination unit (determination unit) 242 in the output processing unit 240 of the calculator 210. The determination unit 242 includes a sum value comparison unit (sum value comparison unit) 245.
[0038]
The sum value comparison unit 245 includes a predetermined threshold value input by the user from the input unit 120 such as a keyboard, a power spectrum of a frequency band corresponding to the fundamental frequency detected by the fundamental frequency component detection unit 141a, and a harmonic frequency. The power spectrum of the frequency band corresponding to the harmonic frequency (2 times) detected by the component detection unit 141b, and the power spectrum of the frequency band corresponding to the harmonic frequency (3 times) detected by the harmonic frequency component detection unit 141b. Are compared with the total value of the power spectrum obtained by summing the power and the rollers (the front top roller 13a and the front bottom roller 13b). That is, the sum of the power spectrum of the frequency band corresponding to the fundamental frequency of the front top roller 13a and the power spectrum of the two frequency bands corresponding to the harmonic frequencies (2 times and 3 times) is smaller than the predetermined threshold. If it is larger, it is determined that the front top roller 13a has a defect such as eccentricity or a scratch. On the other hand, if the sum of the power spectrum of the frequency band corresponding to the fundamental frequency of the front bottom roller 13b and the power spectrum of the frequency band corresponding to the harmonic frequency is larger than a predetermined threshold, the front bottom roller 13b It is determined that there is a defect such as eccentricity or scratch. Note that the predetermined threshold can be appropriately set by the user.
[0039]
When the determination unit 242 (total value comparison unit 245) determines that the front top roller 13a or the front bottom roller 13b has a defect, a process such as issuing a signal to the warning circuit 108 is performed. Are displayed as digital values on the display 107 as they are.
The front top roller 13a or the front bottom roller 13b determined to have a defect is replaced, or a roller made of rubber (the front top roller 13a in the present embodiment) is shaved by buffing and re-cut. used.
[0040]
Note that, similarly to the first embodiment, it is desirable to provide two levels (alarm level and stop level) for the threshold value of the total value comparison unit 245 (however, the stop level is larger than the alarm level). Set to be.) That is, when the sum of the power spectrum of the frequency band corresponding to the fundamental frequency and the power spectrum of the two frequency bands corresponding to the harmonic frequencies (double and triple) exceeds the alarm level threshold, Process as described above. On the other hand, the sum of the power spectrum of the frequency band corresponding to the fundamental frequency and the power spectrum of the two frequency bands corresponding to the harmonic frequencies (double and triple) is equal to or higher than the alarm level. When the threshold value is exceeded, for example, the operation of the weight is stopped. Thereby, the user can take measures according to the degree of the defect of the front roller 13.
[0041]
Further, similarly to the first embodiment, in addition to the sum value comparison unit 245, the determination unit 242 includes a frequency band other than the frequency band corresponding to the fundamental frequency and the frequency band corresponding to the harmonic frequency (for example, In FIG. 4, it is desirable to provide a comparison unit for comparing a power spectrum of 0.5 Hz to 200 Hz (excluding the portions (1) and (2)) with a threshold value set separately. That is, the comparison unit for the frequency band excluding (1) and (2) is configured to determine the periodic spots other than the front roller 13. Thereby, the abnormality of the power spectrum generated in the frequency band corresponding to the harmonic frequency is not erroneously detected as the yarn unevenness abnormality other than the failure of the front roller 13, but is more accurately determined as the periodic unevenness due to the failure of the front roller 13. The yarn unevenness can be accurately evaluated. That is, in the first embodiment, even if none of the frequencies exceeds the threshold, if any of these frequencies shows a power spectrum that is close to the threshold, detection may be possible by addition.
[0042]
As described above, according to the yarn unevenness information analyzing apparatus 200 of the spinning machine 1 of the second embodiment, the frequency components of the frequency band corresponding to the fundamental frequency and the frequency bands corresponding to the double and triple harmonic frequencies are used. Are compared by the sum value comparison unit 245 with respect to the total value of the frequency components. Therefore, since only one threshold is set in the sum value comparison unit 245, it is simple and easy to determine by combining the fundamental frequency and the periodic unevenness generated at the double and triple harmonic frequencies. The roller failure can be detected with higher accuracy.
[0043]
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various forms are possible as long as they are described in the claims.
[0044]
Embodiments other than the yarn unevenness information analyzing apparatus 100 for a spinning machine according to the first embodiment and the yarn unevenness information analyzing apparatus 200 for a spinning machine according to the second embodiment described above may be used. Here, as an example, a yarn unevenness information analysis device 300 of a spinning machine according to another embodiment will be described with reference to FIG. FIG. 6 is a block diagram illustrating a yarn unevenness information analyzing device of a spinning machine according to another embodiment. FIG. 6A is a block diagram schematically illustrating the yarn unevenness information analyzing device of the spinning machine according to another embodiment. It is a figure, (b) is a block diagram showing the 2nd comparison part.
[0045]
As shown in FIG. 6A, the output processing unit 340 included in the calculator 310 of the yarn unevenness information analyzing device 300 is provided with the first comparing unit 143 (of FIG. 6A) of the yarn unevenness information analyzing device 100 described above. The first comparing section (corresponding to the first comparing section) 343) and the second comparing section 144 (corresponding to the second comparing section (second comparing section) 344 in FIG. 6A), and the above-described yarn unevenness information analyzing apparatus. A determination unit (determination unit) 342 including 200 total value comparison units 245 (corresponding to the total value comparison unit (total value comparison unit) 345 in FIG. 6A) may be provided. The second comparing section 344 is a double frequency comparing section 144a (corresponding to the double frequency comparing section 344a in FIG. 6B) of the yarn unevenness information analyzing apparatus 100, and a triple frequency comparing section 144b (FIG. 6). (Corresponding to the triple frequency comparison unit 344b of FIG. 2B).
In this case, as shown in FIG. 6A, the outputs of the first comparing section 343, the second comparing section 344, and the sum value comparing section 345 have passed through the OR gate 342a. As described above, since the outputs from the double frequency comparing section 344a and the triple frequency comparing section 344b pass through the OR gate 342b, the first comparing section 343 and the second comparing section 344 (the double frequency comparing section 344a, the triple frequency comparing section 344). When one of the frequency comparison unit 344b) and the sum value comparison unit 345 determines that the front top roller 13a or the front bottom roller 13b is defective, processing such as issuing a signal to the warning circuit 108 is performed. After that, it is displayed as it is on the display 107 as a digital value.
[0046]
As described above, according to the yarn unevenness information analysis device 300 of the spinning machine 1, the first comparison unit 343, the second comparison unit 344 (the double frequency comparison unit 344a, the triple frequency comparison unit 344b), and the sum value comparison unit 345. In the comparison of the power spectrum of the frequency band corresponding to the fundamental frequency, the comparison of the power spectrum of the frequency band corresponding to the double and triple harmonic frequencies, and the power spectrum of the frequency band corresponding to the fundamental frequency The comparison with the total sum of the power spectra of the frequency bands corresponding to the double and triple harmonic frequencies is separately performed. Accordingly, in the first comparing section 343 and the second comparing section 344 (the double frequency comparing section 344a, the triple frequency comparing section 344b), the periodic unevenness generated at the fundamental frequency or the double and triple harmonic frequencies. Is accurately determined in accordance with the tendency, and the sum value comparing unit 345 further determines the fundamental frequency and the periodic unevenness generated at the double and triple harmonic frequencies together, so that the total value is further accurately determined. Roller failure can be detected.
[0047]
Note that, as in the first embodiment and the second embodiment, the determination unit 342 includes a first comparison unit 343, a second comparison unit 344, and a sum value comparison unit 345, as well as corresponding to the fundamental frequency. Regarding the power spectrum of the frequency band other than the frequency band corresponding to the frequency band and the harmonic frequency (for example, in FIG. 4, a range of 0.5 Hz to 200 Hz and a range excluding (1) and (2)). It is desirable to provide a comparison unit for comparing with a separately set threshold value. That is, the comparison unit for the frequency band excluding (1) and (2) is configured to determine the periodic spots other than the front roller 13. Thus, the abnormality of the power spectrum generated in the frequency band corresponding to the harmonic frequency is not erroneously detected as a yarn unevenness abnormality other than the failure of the front roller 13, but is correctly determined as the periodic unevenness due to the failure of the front roller 13. And yarn unevenness can be accurately evaluated.
[0048]
In the above-described yarn unevenness information analyzing apparatuses 100, 200, and 300 of the spinning machine, the yarn unevenness information is analyzed for one weight, but the invention is not limited thereto. That is, since the analysis of the yarn unevenness information can be performed in a very short time, a yarn unevenness information analysis device of a spinning machine that analyzes the yarn unevenness information for a plurality of weights may be used. For example, as a modified example of the yarn unevenness information analyzing apparatus 100 for a spinning machine according to the above-described first embodiment, if a yarn unevenness information analyzing apparatus 400 for a spinning machine as shown in FIG. Thus, it is possible to sequentially analyze the yarn unevenness information for a very large number of weights.
[0049]
The yarn unevenness information analysis device 400 of the spinning machine shown in FIG. 7 includes, for example, a slab catcher (yarn unevenness detector) 101 attached to each weight of the 60-weight spinning machine 1 and one calculator 110. Are connected by the multiplexer 160 of FIG. The multiplexer 160 electrically connects the spinning machine 1 and the calculator 110 one by one at a time interval set in order. For example, if one measurement time per one spindle is 60 seconds. The analysis of the yarn unevenness information is performed once an hour for a certain weight. As shown in FIG. 8, the multiplexer 160 has a yarn unevenness signal line 161 and a controller signal line 162, and the yarn unevenness signal line 161 and the controller signal line 162 are a spinning machine having 60 spindles. 1 are connected to a slab catcher (yarn unevenness detector) 101 attached to each weight.
[0050]
Further, in each of the above embodiments, the harmonic frequency calculation unit 132 calculates the double and triple frequency as the harmonic frequency, and the harmonic frequency component detection unit 141b detects the double and triple frequency components. In this case, the roller is determined to be defective, but the present invention is not limited to this. For example, depending on the case, the target harmonic frequency component may be appropriately selected, such as only twice or twice to four times.
For example, taking the first embodiment described above as an example, in the harmonic frequency component detection unit 141b, the power spectrum in a frequency band corresponding to one or a plurality of harmonic frequency components selected by the harmonic frequency calculation unit 132 Is divided. Further, the second comparing section 144 includes one or a plurality of comparing sections in which threshold values corresponding to one or a plurality of harmonic frequency components selected by the harmonic frequency calculating section 132 are set. Alternatively, it is determined in each of the plurality of comparison units whether or not the threshold value is larger than the threshold value set for each.
[0051]
Further, in each of the above embodiments, the fundamental frequency and the harmonic frequency of the front top roller 13a and the front bottom roller 13b are calculated by the roller rotation frequency calculation unit 130, but the invention is not limited thereto. The back roller 11 and the second roller 12 may be any rollers that form a pair of rollers provided in the draft device 10.
[0052]
【The invention's effect】
As described above, according to the yarn unevenness information analysis device for a spinning machine according to claim 1 of the present invention, the power spectrum in the frequency band corresponding to the fundamental frequency and the one or more harmonic frequencies The quality of the roller is determined based on the power spectrum of the frequency band to be used. Therefore, it is possible to accurately detect a roller failure based on a periodic unevenness that occurs in a frequency band corresponding to the fundamental frequency or a frequency band corresponding to one or more harmonic frequencies.
[0053]
According to the yarn unevenness information analysis device for a spinning machine according to claim 2, comparison of the power spectrum of the frequency band corresponding to the fundamental frequency and comparison of the power spectrum of the frequency band corresponding to one or more harmonic frequencies are performed. Are done separately. Therefore, the periodic spots generated at the fundamental frequency or at one or more harmonic frequencies can be accurately determined in accordance with the tendency, and roller failure can be detected with high accuracy.
[0054]
According to the yarn unevenness information analyzing apparatus for a spinning machine according to claim 3, the power spectrum of the frequency band corresponding to the fundamental frequency and the power spectrum of the frequency band corresponding to one or more harmonic frequencies are summed up. Comparison is made. Therefore, by judging together the periodic unevenness occurring at the fundamental frequency and at one or more harmonic frequencies, it is possible to detect the roller failure easily and more accurately.
[0055]
According to the yarn unevenness information analysis device for a spinning machine according to claim 4, the power spectrum of the frequency band corresponding to the fundamental frequency and the power spectrum of the frequency band corresponding to one or more harmonic frequencies are compared. In addition, the power spectrum of the frequency band corresponding to the fundamental frequency and the comparison with the total sum of the power spectra of the frequency bands corresponding to one or more harmonic frequencies are separately performed. Accordingly, the periodical unevenness occurring at the fundamental frequency or at one or more harmonic frequencies can be accurately determined according to the tendency, and at the fundamental frequency and at one or more harmonic frequencies. By determining the periodic unevenness together, it is possible to detect a roller defect with higher accuracy.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating an example of a draft device and a spinning unit of a pneumatic spinning machine to which a yarn unevenness information analyzing device of a spinning machine according to an embodiment is attached.
FIG. 2 is a block diagram showing a yarn unevenness information analyzing device of the spinning machine according to the first embodiment, and FIG. 2 (a) schematically shows the yarn unevenness information analyzing device of the spinning machine according to the first embodiment. FIG. 4B is a block diagram illustrating a second comparison unit.
FIG. 3 is a schematic view showing an example of a slab catcher (yarn unevenness detector).
FIG. 4 is a graph showing an example of a frequency band corresponding to a fundamental frequency and a frequency band corresponding to a harmonic frequency.
FIG. 5 is a block diagram showing a yarn unevenness information analysis device of a spinning machine according to a second embodiment.
FIG. 6 is a block diagram illustrating a yarn unevenness information analyzing apparatus of a spinning machine according to another embodiment, and FIG. 6A is a block diagram schematically illustrating the yarn unevenness information analyzing apparatus of the spinning machine according to another embodiment. It is a figure, (b) is a block diagram showing the 2nd comparison part.
FIG. 7 is a schematic diagram showing a modified example of the yarn unevenness information analyzing device of the spinning machine according to the first embodiment.
8 is a schematic circuit diagram showing details of a part of the yarn unevenness information analyzing device of the spinning machine shown in FIG. 7;
[Explanation of symbols]
1 Spinning machine
2 Spinning department
4 thread
10 Draft device
11 Back roller
12 Second Roller
13 Front roller
13a Front top roller
13b Front bottom roller
14 Sliver
100 Yarn unevenness information analyzer
101 Slab catcher (Yarn unevenness detector)
130 Roller rotation frequency calculation unit (roller rotation frequency calculation means)
141 Roller rotation frequency component detection unit (roller rotation frequency component detection means)
142 Judgment Unit (Judgment Means)
143 First Comparison Unit (First Comparison Means)
144 second comparing section (second comparing means)
150 Frequency analysis unit (frequency analysis means)
200 Yarn unevenness information analyzer
242 Judgment unit (judgment means)
245 Sum value comparison unit (sum value comparison means)
300 Yarn unevenness information analyzer
342 Judging unit (judging means)
343 First Comparison Unit (First Comparison Means)
344 Second Comparison Unit (Second Comparison Means)
345 sum total value comparison unit (sum total value comparison means)

Claims (4)

In a yarn unevenness analysis device for a spinning machine including a plurality of roller pairs, and a draft device for drafting a sliver and sending the sliver to a spinning unit,
The draft device, a yarn unevenness detector that detects a yarn unevenness signal of the yarn generated through the spinning unit,
A frequency analysis unit that processes the yarn unevenness signal and performs a spectrum analysis, and outputs a power spectrum for each frequency component;
A fundamental frequency corresponding to one rotation of the rollers constituting the roller pair, and a roller rotational frequency calculating means for calculating one or a plurality of harmonic frequencies that are two or more natural numbers times the fundamental frequency,
From the power spectrum for each frequency component obtained by the frequency analysis means, the fundamental frequency, and roller rotation frequency component detection means for detecting the power spectrum of each frequency band corresponding to the one or more harmonic frequencies,
A yarn unevenness information analyzing apparatus for a spinning machine, comprising: a determination unit configured to determine the quality of the roller based on a power spectrum detected by the roller rotation frequency component detection unit. The determining means includes:
First comparing means for comparing a power spectrum detected in a frequency band corresponding to the fundamental frequency with a preset first threshold value;
A second comparing unit that compares a power spectrum detected in a frequency band corresponding to the one or more harmonic frequencies with a preset threshold value corresponding to the one or more frequency bands,
2. The yarn unevenness information analysis device for a spinning machine according to claim 1, wherein the quality of the roller is determined based on the comparison results of the first comparison unit and the second comparison unit. 3. The determining means includes:
The power spectrum detected in the frequency band corresponding to the fundamental frequency and the power spectrum detected in the frequency band corresponding to the one or more harmonic frequencies are added together, and the total power spectrum sum and the Including a sum value comparing means for comparing with a set threshold value,
The yarn unevenness information analysis device for a spinning machine according to claim 1, wherein the quality of the roller is determined based on a comparison result of the total value comparison unit. The determining means includes:
First comparing means for comparing a power spectrum detected in a frequency band corresponding to the fundamental frequency with a preset first threshold value;
A second comparing unit that compares a power spectrum detected in a frequency band corresponding to the one or more harmonic frequencies with a preset threshold value corresponding to the one or more frequency bands,
The power spectrum detected in the frequency band corresponding to the fundamental frequency and the power spectrum detected in the frequency band corresponding to the one or more harmonic frequencies are added together, and the total power spectrum sum and the Including a sum value comparing means for comparing with a set threshold value,
2. The yarn unevenness information analyzing apparatus for a spinning machine according to claim 1, wherein the quality of the roller is determined based on a comparison result of the first comparing unit, the second comparing unit, and the total value comparing unit.

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