JPS6257953A - Yarn unevenness analyzer of spinning machine - Google Patents

Abstract

PURPOSE:To carry out detailed analysis only for a required spindle, by making possible the changeover of auto mode and manual setting of cumulative frequency in the auto mode independently of the auto mode. CONSTITUTION:The changeover of auto mode for continuously carrying out successively slection of spindles for analysis by spindle selection means and manual mode capable of selecting desired spindle for analysis is made possible. The cumulative frequency in the munual mode can be set independently of the auto mode. Detailed analysis is carried outonly for a required spindle to eliminate useless time in measurement of yarn unevenness.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) This invention relates to a yarn unevenness analysis device for a spinning machine.

(Prior art) In general, innovative spinning machines such as bundled spinning machines and spinning machines such as wine goo machines are equipped with a slub catcher, which detects yarn defects such as slabs existing in the spun yarn during the operation of the tray.
Immediate photo-cutting is performed to remove yarn defects. However, in addition to large yarn defects such as slubs, spun yarns have small variations in yarn thickness that are not considered yarn defects. This fluctuation in yarn thickness is caused by eccentricity or deformation of the roller, defects in the drive system, or the attachment of cheap materials to the 818fl convergence groove of the spinning rotor in an open-end spinning machine. There are fluctuations and non-periodic unevenness. Periodic fluctuations in thread thickness will appear as defects in the moire pattern when fabric is woven with the thread, and will significantly reduce the commercial value of the fabric. It can also be a drawback. However, the above-mentioned drawbacks such as fluctuations in yarn thickness are not detected during operation of the spinning machine, and some of the wound bobbins are pulled out and the yarn wound on the bobbins is placed in another location. Test equipment and specs! - Evaluation of yarn unevenness is performed using a testing device such as a 〇 graph, and thereby the yarn is inspected and defects in the spinning machine are estimated.

However, when the above-mentioned inspection method is adopted to detect yarn unevenness, manual sampling is time-consuming and inspection using testing equipment such as an unevenness tester and a spec1-logograph takes a long time. . In addition, since the spinning machine (,) is operated continuously, a large amount of yarn with uneven defects is produced during that time.Furthermore, since the above method requires manual labor, the process itself is a unique process. It is actually impossible to frequently perform this inspection on each of a large number of spindles, rather than on yarns, as it would require a large number of people and many inspection devices, and it is actually impossible to do so. production may be overlooked.

In order to eliminate the above-mentioned drawbacks, Japanese Patent Application Laid-open No. 168139, published on September 21, 1980, and October 1988,
In Japanese Patent Application Laid-open No. 59-1798264 published on May 12th, the yarn signal from a slab catcher installed in a spinning machine is converted from a function of time to a function of wavelength, and is subjected to fast Fourier transform (FaSt Fourier Transform).
A device has been proposed that detects periodic unevenness in yarn using a rm (abbreviated as FFT) technique.

(Problem to be Solved by the Invention) However, in the above-mentioned device, the cumulative number of times when analyzing the thread signal from the slab catcher provided for each spindle is fixed, so the cumulative number of times is small. Even when it can be determined that there is periodic irregularity, the calculation process is performed up to a predetermined cumulative number of times.

The calculation processing time required for this predetermined number of additions is usually 10 seconds, so when analyzing yarn unevenness of multiple spindles with one analyzer, the processing time required for analyzing all spindles of the spinning machine is 10 seconds. The problem is that it takes a very long time. or,
There is also the problem that it is not possible to perform a more detailed analysis of the thread signal for a particular plow.

Coupling of the Invention (Means for Solving the Problems) In order to resolve the above problems with VR, in this invention, a device is provided at each heel portion to output an electric signal corresponding to the diameter or cross-sectional area of the running thread. a frequency analyzer that performs frequency analysis on the output from the sensor (No. 3) using a fast Fourier transform method, and an accumulator that accumulates the data processed by the frequency analyzer and allows the number of times of accumulation to be arbitrarily set. and a weight selection means for selecting a weight for the analysis and making it possible to input the output signals from each of the sensors to the frequency analysis means.

Further, the mode is switched between an auto mode in which analysis weights are sequentially and continuously selected by the one-take record weight selection means and a manual mode in which a desired analysis weight can be selected, and the number of times of accumulation by the accumulation means in the manual mode is changed to the auto mode. and a switching means that can be set independently of the above, and compares the arithmetic processing data by the cumulative means with a preset reference value, and if the comparative soaked data exceeds the reference value, it is determined to be abnormal. and display means for displaying the judgment result of the judgment means.

(Function) In the device of the present invention, an electric signal corresponding to the diameter or cross-sectional area of the running thread is constantly output from the sensor disposed at each heel. Then, normally, the output signals from the sensors of each weight are sequentially converted into digital signals based on the selection signal of the weight selection means, and then inputted to the frequency analysis means. In the frequency analysis means, the data processed by the fast Fourier transform method is compared with a preset reference value, and when the comparison arithmetic processing data exceeds the reference value, it is determined to be a string, and the judgment result is displayed on the display means. be done.

The selection of analysis weights is performed sequentially and continuously by the weight selection means.In the case of O1 to mode, the analysis is performed with a predetermined value with the cumulative number of times set in advance.However, when switching to manual mode, the selection of analysis weights is performed sequentially and continuously. Any desired weight can be selected independently of the selection order of analysis heels. Furthermore, in the manual mode, the number of additions can be set independently of the automatic mode, and by increasing the number of additions only for a specific weight, precise analysis is possible.

(Example) Below, an example in which the present invention is embodied in a binding spinning machine will be described with reference to the drawings. As shown in Fig. 1, the binding and spinning device drafts the sliver S supplied from a can (not shown) into a flat ribbon-like fiber bundle by a drafting device consisting of a back roller 1, an apron 2, and a front roller 3. The yarn Y is heated by a post-heating nozzle 4 and spun as yarn Y, which is drawn upward by a draw-off roller 5 and a top roller 6 and wound onto a winding bobbin (not shown). Then, downstream of the draw-off roller 5 (
A slab catch safe as a sensor that outputs an electric signal corresponding to the diameter or cross-sectional area of the running yarn is disposed in the upper part of FIG.

The slab catcher 7 is composed of a capacitance type sensor that outputs an amount of electricity corresponding to a change in the mass of the thread passing through it. Further, when an extremely large displacement of electric quantity due to passage of a slab or the like is detected, a cutting device (not shown) cuts the working yarn Y in response to a signal. Furthermore, it is also possible to employ a system based on charge conversion as a sensor.

Next, a yarn unevenness analyzer for analyzing unevenness of the yarn Y during spinning based on the output signal from the slab catch 17-7 will be described. In this yarn unevenness analyzer, the output signal from the slab catcher 7 is digitized by the A/D converter 8, and then input to the analysis means and analyzed, and the analysis results are displayed on the display means. There is.

In the device of this embodiment, 60 spindles on one side, 1 in total on both left and right sides.
The yarn unevenness of 20 spindles is analyzed using one analyzer. The output signal from the slab catcher 7 arranged for each slab is sent to the amplifier 11 via the first multiplexer 9 and the second multiplexer 10 constituting the weight selection means. ,
/ After being amplified to the most suitable voltage level for digitization by the D converter 8, the voltage is amplified by the low-pass filter 12.
01-(After two or more signals are cut, the analog signal is converted into a digital signal by the A/D converter 8 and input to the central processing unit (CPU) 13 as the lower stage of analysis.The slab catcher-7 is Each group of 12 blocks is electrically connected to a total of 101 m of first multiplexers 9, and each of the ten first multiplexers 9 is electrically connected to a second multiplexer 10. The weight selection signal g from the CPU 13 enables the output signal from the slab catch 17-7 of a predetermined weight to be input to the CPtJ13 via both multiplexers 9 and 10.

The CPU 13 operates based on a read-only memory ROM 15 in which a control program is stored, and the arithmetic processing results in the CPIJ 13 are stored in a readable and rewritable memory RAM.
16 is temporarily stored.

The CPU 13 controls the A/D control timer 17.
Input the sampling signal from the D converter 8 for a predetermined time and perform frequency analysis (spectrum analysis). Integration of conversion data 31
and processing.

First, to explain the spectrum analysis, the signal from the △7'D converter 8 is processed by a fast Fourier transform (FFT) method, is accumulated a predetermined number of times, and is vector-synthesized into a power spectrum. The power spectrum signal of each frequency component is stored in the RAM 16, and is displayed as a graph as shown in FIG. 4 or FIG. 10 on the screen of the CRT 20 as a display device via the graphic processor 18, if necessary. In this case, the frequency range is processed to 508Z or less, but this is because the frequency range in which periodic unevenness caused by eccentricity or deformation of the front roller, which causes periodic unevenness in the yarn, appears is 30 to 40 t.
This is because frequencies above 50 H2 have little meaning since they are around -1z.

For example, yarn speed 180 m/min, overfeed rate 1.0
47. Assuming that the diameter of the front top roller 3b is 28 mm and the diameter of the front bottom roller 3a is 25+nm,
The frequency of the front top roller 3a <FB) is
FB= (180x1.047x1'000/60
)÷(25×π)=40.0Hz. Also, the frequency (FT) of the front top roller 3b is calculated from FT= ((front bottom roller diameter)/'(front top roller diameter))XFB, FT=(2,5/2.8)X, 40.
0=35.7H2. That is, under the above spinning conditions, the periodic unevenness caused by the front top roller 3b appears at a frequency of 35.7l-IZ, and the periodic unevenness caused by the front bottom roller 3a appears at a frequency of 40.0Hz. .

Then, the CPU 13 stores the processed data processed by the FFT method in the RAM 16, and sets the 1st shift corresponding to the frequencies of the front bottom roller 3a and the front rollers 1-1 to 3b to preset reference values. By comparing, it is determined whether or not the periodic unevenness of the yarn is within an allowable range, and the determination result is stored in the RAM 16.

When making a comparison judgment with the reference value, the reading area is set to FB±, taking into account the error in the values of frequencies FB and FT corresponding to the front bottom roller 3a and front top roller 3b.
It is divided into a frequency range BZ of α, a frequency range 1gTZ of FT±3, and other frequency ranges, and the peak level in each range is compared with a reference value calculated in advance according to the yarn type and stored in the RAM 16.

In the case of FIG. 4, the peak P1 is within the region TZ, so it is caused by the front top roller 3b, and the peak P2 is caused by the front top roller 3b.
Since it is within the area BZ, it is read that it is caused by the front bottom roller 3a, and since it is a larger value than the reference values LB and LT, there is something wrong with the front bottom roller 3b and the front bottom roller 3a. It is presumed that this abnormality occurs, resulting in large periodic yarn unevenness. J5, standard 1 series LB and LT are not set to values beyond which the product will be rejected, but are set to values such that if left as they are, a defective product will occur. Even when multiple spindles are managed by one yarn unevenness analyzer by setting reference values in this way, it is possible to avoid the situation where defective yarn is spun after one analysis is performed and before the next analysis is performed. is prevented.

For fluctuations other than periodic irregularities, the yarn signal converted into a digital signal by the A/D converter 8 is processed according to the following formula, and V=
The state of yarn unevenness is determined by comparing the value of (n (data) 2)/(number of data) (2) with a predetermined reference value. The value of V and the determination result are then stored in the RAM 16.

As shown in FIG. 3, the display device 19 includes a cathode ray tube (CRT) 20 as a display screen, and displays the CP on the CRT screen.
Information such as the progress of the spectrum analysis performed by tJ 13, the calculation results, and the results of determining the presence or absence of an abnormality based thereon are displayed as characters or figures.

The conditions for performing spectrum analysis (frequency analysis) are the number of additions, yarn speed, and straightness of the front top roller 3b.
, or set values such as reference values and reading areas that are used as criteria for determining whether or not the calculation result is below a certain reference level.
An input device 21 for inputting input to M16 is integrated into the display device 19 as a keyboard. 0 to keyboard
It has number keys up to 9, letter keys R and E, arrow keys for moving the cursor, a decimal point key, and spare keys.

The display on the screen of the CRT 20 can be changed by pressing the mode switching keys 22, 23.
24, the display in the set mode when inputting the initial setting value, the display in the auto mode in which the thread signals from the slab catch-C'p-7 of each spindle are sequentially and continuously performed, or the display of the desired heel thread. The display can be switched to one of the manual modes for selectively analyzing signals. In order to protect both sides of the CRT and eliminate the influence of afterimages, no image is always displayed on the CRT screen, but when the image display key 25 is pressed, the image shown in FIG. 7 is first displayed. . That is, when the CPU 13 detects an abnormality as a result of analyzing the yarn signal, the warning lamp 26 lights up, and the operator can identify which weight has the abnormality when the warning lamp 26 lights up. In order to check, an image is displayed on the screen of the CRT 20 by pressing the image display key 25.

Next, the thread unevenness analysis operation of the CPU 13 will be explained according to the flowchart of FIG.

When the measurement is started, the CPU 13 first sends a weight selection signal to the multiplexers 9 and 10, and the multiplexers 9 and 10 are activated based on the weight selection signal, so that the output signal of the slab catcher 7 of a predetermined weight can be input. . And △/
A sampling signal is sent to the D control timer 17, and based on the sampling signal, the CPU
A signal is input to 13 (step 31). Next, it is determined whether or not there is a student power signal for a predetermined time (0.5 to 1 second), and a check is made to see if measurement is possible (step 82). If there is no input signal, the measurement is stopped. Then, a measurement disabling process (step 83) is performed, the measurement of that weight is completed, and the measurement of the next weight is performed. The unmeasurable process is to store in the RAM 16 that it is unmeasurable, and to display *** as shown in FIG. 8 when displaying the analysis results on the screen of the CRT 20.

On the other hand, if measurement is possible, spectrum analysis processing and data statistics using the FFT method are performed (step 84).
. Each time the FFT analysis is performed, an average is taken together with the previous results (step S5), and the number of averages is counted (step 36). Then, it is determined whether the average number of times, ie, the cumulative number of times, is equal to a set value (step S7). If the average number of times is not equal to the set value, the operations from step S1 are repeated. When the average number of times is equal to the set value, the calculation processing results are calculated for each item, that is, the frequency range corresponding to the front bottom roller 3a, Freon 1 to 1.
~The frequency region corresponding to the tubular roller 3b, the frequency region of that pond, and the value of V are compared with the reference value (step S8
). Then, it is determined whether or not each item exceeds the set value of one shift (step S9), and if there is no item that exceeds the set value, it is stored in the RAM 16 that it is normal. On the other hand, if even one of the items listed in +iif exceeds the set value, an abnormality confirmation process (step 510) is performed and the measurement ends. The abnormality confirmation process is to turn on the alarm lamp 26 and store abnormal items and normal values in RAM1.
6 and make it possible to display it on the screen of the CRT 20.

Next, the functions of the mode switching keys 22, 23, and 24 will be explained according to the flowchart shown in FIG. After initialization is performed when the power is turned on, the thread unevenness analyzer stores data in ROM15.
According to the control program, measurements are sequentially started in auto mode from the gear end side of the weight placed on the left side. When the image display key 25 is pressed in this state, the information shown in FIG. 7 is displayed on the screen of the CRT 20. The order of measurement is Ll, L
2...L5. The analysis is performed in the order of R1, R2, . . . R5, and a triangle mark is displayed on the heel currently being analyzed. Further, if even one of the four items exceeds the reference value as a result of the analysis, an abnormality is displayed on the corresponding weight.

Also, an asterisk (*) is displayed for weights that cannot be measured. At the top of the screen of the CRT 20, the number of the weight currently being analyzed and the measurement data of the previous weight are displayed, and measured values exceeding the reference value are displayed in reverse video. Further, the yarn speed, reference values for each measurement item, and feed ratio are displayed at the bottom of the screen. Therefore, in the case of the screen shown in FIG. 7, it can be seen that the third spindle (the 15th spindle on the left side) of the L2 block is currently being analyzed.

In the state of the screen shown in FIG. 7, among the keys of the input device 21, Ll, L2...L5. R1...
・Press R5 to display the details of the corresponding block.
Switch to the screen shown in the figure.

At this time, measurements in auto mode continue to be performed sequentially.

For example, if you want to know the details of block 1 from the state shown in Figure 7, press the Ll key and the screen will change to the screen shown in Figure 8, which will show you what the abnormality item is for the 9th weight (L9) of block L1. I understand. If you want to display the screen of another block that corresponds to the detail screen shown in Fig. 8, you can also display it by pressing the key of the corresponding block in the same way as above, but you can also press the ↑↓ main key of the cursor key ( You can also display the data table for another block by pressing the ↑ key to move forward one block, and press the ↓ key to move back one block. At the bottom of the data table, each item is displayed. The reference value and the frequencies of the front bottom roller 3a and front top roller 3b are displayed. Therefore, by comparing the measured value of each weight with the reference value, it becomes clear which item is abnormal. C of the data table in the figure
The Hl column contains data caused by the front bottom roller, the CH2 column contains data caused by the front top roller, and the CH3 column contains data caused by other causes.
Statistical data is displayed in each column.

When displaying the detail screen, if there is a weight being measured in the block being displayed, data for each average during the measurement is displayed. Further, the data on the detail screen is such that the data of the previous measurement cycle is cleared only for the weight for which measurement is newly started. Therefore, the data of the weight before the heel being measured is displayed in the current measurement cycle, and the data of the heel after the heel being measured is the data of the previous cycle. CRT20
When the input device 210E key is pressed while the detail screen is being displayed on the screen, the normal screen shown in FIG. 7 is restored. Also, mode switching key 24 (MANUAL),
22 Press (SET) to switch to manual mode or set mode. When switching to manual mode, measurement in auto mode is interrupted and the data of the weight in the middle of measurement is discarded. When the manual mode is switched to the automatic mode by pressing the mode switching key 23 (AUTO) again, the measurement is restarted from the interrupted weight.

To start manual analysis, first, the number of the heel that requires analysis is input using the keys of the input device 21. Enter the average number of times tll<cumulative number of times) in Thorn. The average number in manual mode is set to a predetermined value different from the average number in auto mode () as the initial m value. Set the number of times.If there is no need to change the number of averages, just press the Enter key (F) to start the analysis.The screen in manual mode shows the frequency analysis (Spec 1-1) as shown in Figure 10. The processing graph of the process (file analysis) and ■ value and number of averages are displayed.The number of averages is displayed in correspondence with the number currently being processed and the set number of times, and the graph displays the average processed for each average. In addition, the monitoring width and limit level corresponding to the front I-bottom roller 3a and front top roller 3b are displayed as line segments on the screen, and an abnormality is detected depending on whether the peak of the spectrum exceeds the corresponding line segment. The presence or absence can be determined.Also, by moving the cursor using the cursor keys, the XY coordinates are displayed on the screen and the accurate value of the peak position can be read.During measurement in manual mode When the input key E is pressed or after the measurement is completed, the measurement holder is in the input state (ζ returns).

By switching to manual mode in this way, it is possible to set the average number independently of the average number in auto mode, that is, the cumulative number, so it is easy to change the average number as necessary, and as a result, the analysis can be carried out to the minimum necessary. This can be done in a time of .

When the mode change key 22 is pressed in manual mode or auto mode, the screen of the CRT 20 changes to the set mode screen shown in Figure 9, and displays the reference value of each measurement item, yarn speed, reading area width (monitoring width), front top roller. 3b
It is possible to set or change the average number, that is, the cumulative number, in O1 to mode. When switching from auto mode to set mode, the measurement is interrupted and the data of the weight being measured is '61.
tJ is done.

Further, in the human mode, when the input key E is pressed after the input length of the required item has been changed, the mode is switched to the auto mode, and the measurement is restarted from the weight that was interrupted.

In addition, if the lock key 27 is turned to the locked state after entering the measurement conditions or reference values of the measurement items, etc., when the mode is shifted to the auto mode, the set value will be held in that state, and in that state, the mode changeover switch cannot be pressed. Although it is possible to change between auto and manual modes, it is not possible to change to Sera 1~ mode. To enter the set mode, it is necessary to release the lock key 27 and press the cellar 1 to mode switching keys 22.

Furthermore, if the image display key 25 is pressed again while an image is being displayed on the CRT screen, the image will no longer be displayed.

Note that the present invention is not limited to the above embodiments; for example, instead of inputting the yarn speed as a fixed value corresponding to the spinning conditions in advance, a detector may be installed to detect the rotation of the front hem roller. The yarn speed, that is, the circumferential speed of the front bottom roller, is calculated from the measurement result of the rotational speed of the front roller by the detector and the diameter of the front bottom roller, and the voltage fluctuation or load of the drive system during spinning rotation of the machine is calculated. Even if the yarn speed, that is, the circumferential speed of the front roller changes due to fluctuations in may be configured to be changeable. Also, instead of performing the performance using the FF method along with other processing on the CPU 13, the CPU 1
It is also possible to use a Fourier transformer independent of the Fourier transformer 3 and to perform FFT processing independently with the Fourier transformer. Further, in the above embodiments, the present invention is embodied in a bundled spinning machine, but it is of course possible to be embodied in other spinning machines such as an oven-end spinning machine and a ring spinning machine.

Effects of the Invention As detailed above, according to the present invention, it is possible to switch between an automatic mode in which the selection of analysis weights by the weight selection means is performed sequentially and continuously, and a manual mode in which a desired analysis weight can be selected. Since the cumulative cycle of 45 times in manual mode can be set independently from auto mode, it is possible to perform more detailed analysis only on the necessary weights, and as a result, the analysis time can be reduced even when many weights are managed with one analyzer. It is possible to shorten the yarn length (
This has the excellent effect of eliminating unnecessary time consumption and allowing efficient measurement of multiple weights.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the present invention applied to a binding spinning device, Fig. 2 is an electric block circuit diagram, Fig. 3 is a front view showing a display device and input device, and Fig. 4 is a spectrally analyzed yarn. Diagrams showing signals, Figures 5 and 6 are flowcharts 1 to 7.
The figure shows the display image of the CRT screen in auto mode, Figure 8 shows the detail screen in auto mode, and Figure 9 shows the CRT screen in set mode.
Fig. 1 shows an image of the screen, and Fig. 10 shows an image of the CRT screen when it is set to manual mode. , 10, frequency analysis means, accumulation means 2 CPU 13 as judgment means, display device 1
9, Mode switching key 22.23° 24, Alarm lamp 26
゜Patent applicant Toyoda Automatic Loom Works Co., Ltd. Agent
Person Patent Attorney On 1) Hironobu Figure i

Claims (1)

[Claims] 1. A sensor disposed for each spindle to output an electrical signal corresponding to the diameter or cross-sectional area of the running yarn, and frequency analysis of the output signal from the sensor using a fast Fourier transform method. a frequency analysis means for performing the analysis; an accumulation means for accumulating the data processed by the frequency analysis means and capable of arbitrarily setting the number of times of accumulation; and selecting a weight for the analysis and calculating output signals from the respective sensors. switching between an automatic mode in which the selection of analysis weights by the weight selection means is performed sequentially and continuously, and a manual mode in which a desired analysis weight can be selected. and switching means that allows the number of times of accumulation by the accumulation means in the manual mode to be set independently from the auto mode; A yarn unevenness analysis device for a spinning machine, comprising a determining means for determining an abnormality when a reference value is exceeded, and a display means for displaying the determination result of the determining means.