JP5296513B2 - Yarn running monitoring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for monitoring the running of a thread, setting a threshold for detecting the running abnormality of a thread such as stitch skipping without a burden on a worker. <P>SOLUTION: In the device for monitoring running of the thread, a determination means for determining the running abnormality of the thread includes a threshold search time setting section setting a period for searching the threshold, a threshold setting pulse-number storage means for storing as a threshold setting pulse number the pulse number for every fixed feed amount of the thread detected within the set threshold search time, and a threshold setting means for setting the threshold for determining running abnormality based on the threshold setting pulse number. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an apparatus for monitoring the running of a yarn during operation of a textile machine such as a sewing machine.

  Conventionally, a running yarn is monitored during sewing by a sewing machine. By monitoring the presence or absence of skips that occur when sewing clothes such as shirts and pants with a sewing machine, manufacturing yields can be improved, and the supply of defective products can be reduced, increasing consumer confidence in manufacturers. To help.

As the yarn traveling monitoring device, there are a method of winding a yarn around a roller and a device using a spatial filter, and the spatial filter method is advantageous in that it is not in contact with the yarn.
A yarn traveling monitoring device using a differential spatial filter element is disclosed in Patent Document 1 and Patent Document 2, and has been filed in Patent Document 3. This is because the fluff of the running yarn and the shadow of the fine irregularities of the yarn are projected onto the differential spatial filter element, and the photoelectric current photoelectrically converted by the differential spatial filter element is subjected to signal processing. The running situation of the article is monitored.
When the stitch skip occurs, the upper thread and the lower thread are not entangled, so that the thread consumption is reduced as compared with the case where sewing is performed normally. Using this, the skip is determined by comparing with a preset threshold value.

Here, FIG. 2 shows an electrical configuration of a yarn traveling monitoring apparatus according to an embodiment of the conventional technique. As shown in FIG. 2, in the conventional method, it is necessary for the operator to input a threshold value in advance in the input threshold value storage means 41. Therefore, the conventional method has a problem that it takes time to adjust the set value and the variation by the operator. Furthermore, since the signal to be detected changes when the fabric or thread changes, it is necessary to change the setting when switching between products, which is a burden on the operator.
Japanese Patent Publication No. 05-026516 FIG. Japanese Patent Laid-Open No. 2008-21040 paragraph number 0007, FIG. Japanese Patent Application No. 2008-017422 Paragraph No. 0009, FIG.

  An object of the present invention is to provide a yarn travel monitoring device that can set a threshold for judging abnormality in running of a yarn without variation by an operator, and includes means for the operator to set the threshold without burden.

In order to solve the above-described problem, the yarn traveling monitoring apparatus according to claim 1 is provided with a light source for irradiating light to the yarn, and a light source for irradiating the yarn in two directions opposite to the light source. A differential spatial filter element in which the elements are alternately arranged at the same pitch in the running direction of the yarn and outputs a photocurrent according to a change in the shadow of the yarn irradiated with light, and the photocurrent is converted into a current-voltage converter An amplifier circuit that converts the current-voltage converted voltage into a pulse after waveform shaping, means for counting the number of pulses, and determination means for determining a yarn running abnormality using the number of pulses. A yarn traveling monitoring apparatus in a textile machine including a threshold search time setting unit for setting a period for performing a threshold search by the determination means, and a constant feed amount of the yarn detected within the set threshold search time The number of pulses for each threshold is the number of threshold setting pulses. A threshold value setting pulse number storing means for storing a threshold value setting means for setting a threshold value for determining a running abnormality on the basis of the number of pulses for the threshold setting, only contains the threshold search time setting unit in timer or the textile machine It is characterized in that the threshold search time is set according to the number of moving hands .

The yarn travel monitoring device according to claim 2 , wherein a light source for irradiating the yarn with light and a light source that is disposed in a direction opposite to the light source with respect to the yarn, wherein two light receiving elements are in the direction of travel of the yarn The differential spatial filter elements that are alternately arranged at the same pitch and output a photocurrent according to a change in the shadow of the yarn irradiated with light, and the photocurrent is converted into a current voltage, and the current voltage is converted. An amplifier circuit that converts a voltage into a waveform and then converts it into pulses, means for counting the number of pulses, and judgment means for judging a running abnormality of the yarn using the number of pulses, of a yarn in a textile machine In the travel monitoring device, the determination unit sets a threshold value for a threshold search time setting unit for setting a threshold search period and the number of pulses for each constant feed amount of the yarn detected within the set threshold search time. Threshold setting pulse memorized as number of pulses Storage means comprises a threshold setting means for setting a threshold value for determining a running abnormality on the basis of the number of pulses for the threshold setting, the threshold search time setting unit, and the start of the manual threshold search when the threshold setting It is characterized by setting a stop.

The yarn traveling monitoring apparatus according to claim 3 is the yarn traveling monitoring apparatus according to claim 1 or 2 , wherein the threshold search time setting unit can set a threshold search standby time. Yes.

The travel monitoring device of the yarn according to claim 4, a driving monitoring device yarn of claims 1 to 3, the number of pulses the threshold setting means, stored in said threshold setting pulse number storing means And a threshold value setting means for setting a threshold based on the threshold setting reference value using the minimum value as a threshold setting reference value.

The yarn travel monitoring device according to claim 5 is the yarn travel monitoring device according to claim 4 , wherein the minimum value search means can set a minimum number of pulses stored in the threshold setting pulse number storage means. Compare the value with the next smaller value, and if the difference is larger than the preset value, the previous minimum value is deleted as an abnormal value, and the operation with the second smallest value as the threshold setting reference value is the threshold setting reference value. It is characterized by being a threshold setting reference value search means for obtaining a threshold setting reference value repeatedly until no change is made.

The yarn travel monitoring device according to claim 6 is the yarn travel monitoring device according to claim 5 , wherein the threshold setting means based on the threshold setting reference value is a predetermined value from the threshold setting reference value. The threshold value setting means uses a value obtained by subtracting as a threshold value.

The yarn traveling monitoring device according to claim 7 is the yarn traveling monitoring device according to claim 1 to claim 3 , wherein the threshold setting means stores the number of pulses stored in the threshold setting pulse number storage means. Means for obtaining an average value and a standard deviation at, and means for determining a threshold value using the average value and the standard deviation.

The yarn traveling monitoring device according to claim 8 is the yarn traveling monitoring device according to claims 1 to 7 , wherein the threshold search time setting unit performs threshold search according to the movement of the textile machine. Start and stop, and the threshold setting means includes means for monitoring whether the detected average value or minimum value of the threshold setting pulse number is changed, and determining whether or not to reset the threshold. It is said.

The yarn traveling monitoring device according to claim 9 is the yarn traveling monitoring device according to claim 1 to claim 8 , and generates a sewing pulse in response to an operation of sewing one stitch provided in the textile machine. And means for comparing the timing of the pulse and the sewing pulse generated by the output of the differential spatial filter element, and determining a running abnormality of the yarn according to the operation in which the textile machine performs one stitch sewing. It is said.

  According to the present invention, a threshold value for determining a running abnormality is set based on an actually detected pulse. Therefore, it is not necessary for an operator to set a threshold value based on empirical determination, and the threshold value can be set without variation among workers. In addition, the threshold can be set without burden on the operator when setting the threshold. This improves the production efficiency.

  The yarn traveling monitoring apparatus of the present invention will be described with reference to the drawings. FIG. 3 shows a configuration of a yarn traveling monitoring apparatus according to an embodiment of the present invention. As shown in FIG. 3, the traveling monitoring device 10 of the present invention is attached in the middle of the traveling path of the yarn 14 of the textile machine 12.

  Examples of the textile machine 12 include a sewing machine. The yarn 14 may be either a spun yarn with fluff or a filament yarn without fluff, with or without fuzz. Hereinafter, description will be made using filament yarn. Examples of the filament yarn include silk yarn as natural yarn and nylon yarn and polyester yarn as chemically synthesized yarn. The filament yarn used in the following description is mainly a chemically synthesized yarn.

  A yarn (filament yarn) is a combination of a plurality of long fibers. FIG. 4 shows an enlarged view of the yarn without fluff. As shown in FIG. 4, the surface 15 of the long fiber looks like a smooth surface with no irregularities by visual observation, but has fine irregularities 32 on the surface when magnified by a microscope or the like. The fine irregularities 32 exist in a certain size range depending on the production conditions, environmental conditions, physical properties of the raw materials, and the like when the long fibers 15 are spun. In other words, the fine irregularities 32 of the long fibers 15 are present on the surface of the yarn 14 within a certain range.

  The traveling monitoring apparatus 10 of the present invention shown in FIG. 3 monitors the traveling of the yarn 14 used in the textile machine 12. The sensor 16 includes a light source 18, a differential spatial filter element 20, and a differential amplifier circuit 24. FIG. 5 shows a configuration of the sensor 16.

  The light source 18 irradiates the traveling yarn 14 with light L. The light source 18 uses a light emitting diode or a laser diode. The light L emitted from the light source 18 has a luminance capable of projecting the shade of the shadow due to the fine irregularities 32 of the yarn 14 on the differential spatial filter element 20. For example, a high output with a light emission output of 10 mW or more is good.

  The differential spatial filter element 20 is disposed in a direction opposite to the light source 18 with respect to the yarn 14. The differential spatial filter element 20 includes a plurality of light receiving elements 22a and 22b. Examples of the light receiving elements 22a and 22b include, but are not limited to, pn photodiodes and pin photodiodes. The plurality of light receiving elements 22a and 22b are divided into two series A and B, and each of the series A and B has a plurality of light receiving elements 22a and 22b.

  FIG. 6 is a diagram illustrating a state in which the light receiving elements 22a and 22b are arranged at the same pitch. As shown in FIG. 6, the light receiving elements 22a and 22b of the two series A and B are alternately arranged in the running direction z of the yarn 14 at the same pitch d1. The pitch between the series A light receiving elements 22a and the series B light receiving elements 22b is d1 / 2.

FIG. 7 shows an equivalent circuit of the differential spatial filter element 20. As shown in FIG. 7, the cathodes of the light receiving elements 22a and 22b are short-circuited for each of the series A and B to form a comb-teeth shape.
In the differential spatial filter element 20 in FIG. 5, photocurrents are output from the anodes of both series A and B as series A output and series B output, and sent to the differential amplifier circuit 24. In the differential amplifier circuit 24, the series A output and the series B output are differentially output and sent to the signal processing circuit 26. The differential amplifier circuit 24 amplifies the differential output as needed.

  Further, in order to monitor the running of the yarn 14, the pitch d1 of the light receiving elements 22a and 22b is made substantially the same as the size of the fine irregularities 32 on the surface of the needle yarn 14a. This will be described below.

(1) In the differential spatial filter element 20, the light receiving elements 22a and 22b of two series A and B are alternately arranged at the equal pitch d1.
(2) The output of the differential spatial filter element 20 is affected by the shadow of the fine irregularities 32 of the yarn 14 projected onto the light receiving elements 22a and 22b.
(3) The output of the differential amplifier circuit 24 is a differential output.
From the above (1) to (3), if both the light receiving elements 22a and 22b of the series A and the series B have the same amount of received light, the outputs of the light receiving elements 22a and 22b are cancelled. If the light receiving elements 22a and 22b of the series A and the series B have different received light amounts, a differential output is generated. Note that the received light amounts in the series A and B are averaged or all added.

  If the fine irregularities 32 of the yarn 14 have different sizes with respect to the pitch d1, the received light amounts of the light receiving elements 22a and 22b of both series A and B will be the same or substantially the same. Specifically, even if the light receiving amounts are different between the adjacent light receiving elements 22a and 22b, the light receiving amounts of the light receiving elements 22a and 22b for the series A and B are the same or substantially the same. The outputs of both series A and B are the same or substantially the same, and the differential output of the differential amplifier circuit 24 is 0 or substantially 0.

  If the interval between the concave portions or the convex portions of the fine irregularities 32 is the same as or substantially the same as the pitch d1, the phase of the amount of light received by the light receiving element 22a of the series A and the light receiving element 22b of the series B is shifted by 180 degrees. It becomes. For example, when a shadow due to the depression of the needle thread 14a is projected onto the light receiving element 22a, a shadow due to the protrusion of the thread 14 is projected onto the light receiving element 22b, and the amount of received light corresponding thereto is received. For example, if the shape of the fine irregularities 32 is substantially uniform, the series A and the series B have almost the same received light amount alternately. Therefore, the differential amplifier circuit 24 performs a differential output corresponding to almost double the photocurrent of the light receiving elements 22a and 22b of the series A or the series B.

  Even if the shape of the fine irregularities 32 is somewhat non-uniform, since there are a plurality of light receiving elements 22a and 22b in each of the series A and B, the total amount of light received for each of the series A and B is almost the same alternately. Become. Accordingly, also in this case, the differential amplifier circuit 24 performs a differential output corresponding to almost double the photocurrent of the light receiving elements 22a and 22b of the series A or the series B.

  As described above, in order to differentially output the photocurrent of the light receiving elements 22a and 22b caused by the shadow of the fine irregularities 32 of the yarn 14, the pitch d1 of each of the light receiving elements 22a and 22b is set to the fine irregularities 32 of the yarn 14. The light receiving elements 22a and 22b may be alternately arranged at equal intervals. Therefore, the pitch d1 is set to be substantially the same as the distance d2 from the concave portion to the concave portion of the fine unevenness 32 on the surface of the yarn 14 or the distance d3 from the convex portion to the convex portion. For example, the pitch d1 is 50 to 500 μm, and 50 to 300 μm is preferable among them. As the distances d2 and d3, average values may be used as will be described later.

FIG. 1 is a diagram showing an electrical configuration of a yarn traveling monitoring apparatus according to an embodiment of the present invention.
As shown in the figure, the differential output from the differential amplifier circuit 24 is sent to the signal processing circuit 26.
The signal processing circuit 26 includes an amplifier circuit 28 that converts a pulse corresponding to the value of the photocurrent of the differential spatial filter element 20, and a control circuit 30 that determines abnormal running of the yarn 14 using the pulse. Prepare. The control circuit 30 includes a pulse counting unit 36 that counts the number of pulses, and a determination unit 37 that determines a running abnormality of the yarn 14 based on the number of pulses. The signal processing circuit 26 includes circuit elements such as an operational amplifier, a resistor, and a capacitor.

  In the conversion to a pulse, an output signal from the differential amplifier circuit 24 is input, the waveform is shaped through a band-pass filter, and further amplified and converted into a pulse train of a waveform greater than the value stored in advance. In the pulse counting, the number of pulses in the pulse train is counted.

  Sewing by a sewing machine, which is a textile machine, is sewn by intertwining needle threads and lower threads. If there is an abnormality in the running of the yarn, the needle thread and the lower thread will not be entangled, and the consumption of the needle thread and the lower thread will be reduced compared to when sewing normally. Whether or not a running abnormality has occurred is determined using the difference in yarn consumption.

  Next, the time for counting the number of pulses will be described. The yarn 14 is consumed in accordance with the movement of the sewing needle. Therefore, a proximity switch 34, a photomicro switch, or the like is attached in the vicinity of the sewing needle or the means for operating the sewing needle. For example, the proximity switch 34 is attached in the vicinity of a handle of the sewing needle that operates at a fixed timing, a mechanism for moving the handle, or the like. The proximity switch 34 generates an on / off signal according to the operation of the handle of the sewing machine. If the signal processing circuit 26 generates a sewing pulse in accordance with the on / off signal, a yarn traveling pulse is generated when the sewing pulse is on or off. Therefore, the predetermined time for counting the pulses is when the sewing pulses are on or off.

  Further, the signal processing circuit 26 includes a circuit that compares the timings of the yarn traveling pulses and the sewing pulses and determines whether the yarn 14 is traveling abnormally in accordance with the operation of the means that causes the yarn 14 to travel. It is possible to check whether the running of the yarn 14 and the operation of the textile machine 12 match only by checking whether the pulse timings match. FIG. 8 shows an example diagram showing pulses in the signal processing circuit 26. If the yarn 14 is running normally, the sewing pulse generated by turning on / off the proximity switch 34 and the pulse train of the differential spatial filter element are substantially the same time and the same time, as shown by times T1 and T2 in FIG. Output at intervals.

  Note that the yarn 14 may travel with a certain delay with respect to the operation of the mechanism that moves the handle of the sewing needle. Even in such a case, if one sewing pulse is generated by turning on / off the proximity switch 34, a pulse train is generated by the output of the differential spatial filter element. The signal processing circuit 26 makes the determination in consideration of a certain timing shift between the sewing pulse and the yarn traveling pulse.

  When skipping occurs in the yarn 14, the number of pulses decreases as at time T3 in FIG. The number of pulses is less than the threshold value, and the control circuit 30 determines that the yarn 14 is running abnormally. If it is determined that the running of the yarn 14 is abnormal, a signal may be sent from the signal processing circuit 26 to the alarm device to issue an alarm. For example, as shown in FIG. 8, a signal to the alarm device is changed so that the alarm device issues an alarm. Alternatively, the signal processing circuit 26 may send a signal to a sequencer that controls the operation of the textile machine 12 to stop the operation of the textile machine 12.

  The signal processing circuit 26 may include a circuit that calculates the running yarn length of the yarn 14 from the total number of pulses during the operation time of the textile machine 12 and the yarn speed from the number of pulses per unit time. The calculated running yarn length and yarn speed data of the yarn 14 may be fed back to a sequencer that controls the operation of the textile machine 12. From the fed back data, the sequencer can modify the operation of the textile machine 12.

  Next, the threshold value for determining the yarn running abnormality will be described. For example, the threshold setting is performed at the start of operation of the textile machine 12. In addition, since the signal to be detected changes when the fabric or yarn changes, it is necessary to set a threshold value when switching products.

  The signal processing circuit 26 of the present invention shown in FIG. 1 has a threshold search time setting unit 39, a threshold setting pulse number storage means 38, and a threshold setting means 40, unlike the signal processing circuit 27 of the conventional example of FIG. The number of pulses detected during the threshold search time set by the threshold search time setting unit 39 is stored in the threshold setting pulse number storage means 38 as the threshold setting pulse number, and the threshold setting means 40 uses the number of pulses to set the threshold value. Set.

  Here, the threshold search time setting unit 39 will be described. As one example of the threshold search time setting unit 39, there is one in which a threshold search is manually started and stopped. For example, when it is desired to set a threshold value, the threshold value search is performed only while one product is being sewn, and the threshold value search is stopped after the threshold value is set.

  Alternatively, the threshold search time may be maintained for a certain period using a timer instead of manually. For example, the threshold value is set by setting the threshold search time for 5 seconds after the textile machine 12 is turned on and started to operate.

  The threshold search time may be set using the number of moving hands. For example, the threshold value search is performed while 500 stitches are sewn after the textile machine 12 is turned on and the operation is started, and the threshold value is set. Furthermore, every time the textile machine 12 stops operation and is operated next time, the average value of the threshold setting pulse number may be monitored, and the threshold value may be changed if the condition is satisfied.

  Further, the threshold search standby time may be set in the previous threshold search time setting unit 39. This can be used when it is desired to refer to data after the operation of the textile machine 12 rather than the data immediately after the operation. The threshold search waiting time can be set by time, the number of hands to wait, the range of the yarn speed, and the like.

  The threshold search standby time may be configured so that a numerical value can be input by connecting a touch panel to the signal processing circuit 26.

  The threshold setting pulse number storage means 38 stores the pulse number for each constant feed amount of the yarn detected within the set threshold search time as the threshold setting pulse number. For example, as described above, the number of pulses counted every time the proximity switch 34 is turned on is sequentially accumulated.

Next, the threshold setting means 40 will be described. As an example, the threshold can be set based on the minimum value in the number of threshold setting pulses.
First, a minimum value is searched for the threshold setting pulse number stored by the threshold setting pulse number storage means 38, and the minimum value is set as a threshold setting reference value. Furthermore, considering the case where the number of pulses for running abnormality is included in the threshold setting pulse number, the minimum value and the next smaller value are compared in the threshold setting pulse number, and the difference is larger than the predetermined number. When it is larger, the minimum value is deleted as an abnormal value, and the next smaller value is used as a threshold setting reference value. This operation may be repeated until the threshold setting reference value is not changed, and the threshold setting reference value may be obtained to set the threshold.

  A value obtained by subtracting a predetermined value from the threshold setting reference value may be used as the threshold value. Here, the predetermined value is a value set according to the material of the fabric or yarn.

  As another example, the threshold value may be set using an average value and a standard deviation in the threshold setting pulse number, without being based on the minimum value in the threshold setting pulse number.

As described above, the present invention generates a pulse from the yarn 14 of the textile machine 12 and monitors the yarn running abnormality using the threshold value for judging the running abnormality set by the actually detected pulse.
Therefore, an appropriate threshold value can be set without variation by the operator, and the detection accuracy of the running abnormality in the yarn 14 can be improved. Moreover, since the burden of setting the threshold value of the worker can be reduced, the production efficiency is improved.

  As mentioned above, although embodiment of this invention was described above, this invention is not limited to said embodiment. The yarn 14 having no fluffs shown in FIG. 4 has fine irregularities 32 having a certain range of sizes, but an actual yarn 14 is not necessarily capable of forming minute irregularities 32 having a certain range of sizes. Absent. Therefore, the above-mentioned distances d2 and d3 are the average value of the distances from the concave to the concave of the plurality of fine irregularities 32 on the surface of the yarn 14, the average value of the distances from the convex to the convex, or the average of both distances. Include a value. Further, a representative value may be used from a plurality of distances d2 and d3 without using the average value.

  Although the description has been made using the yarn 14 in which a plurality of long fibers 15 are more combined, a single wire having no fluff and unevenness on the surface may be used. As described above, it is apparent in Patent Documents 1 and 2 that it can be applied to the yarn 14 having fluff.

  The signal processing circuit 26 may be not only a circuit element such as an operational amplifier but also a circuit including software as necessary. A non-contact sensor other than the proximity switch 34 may be used as long as an electrical signal is generated in accordance with the operation of the mechanism that causes the yarn 14 to travel.

  The threshold search waiting time input means may be directly input not only to the touch panel but also to a personal computer or a sequencer.

  In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

Electrical configuration diagram of a yarn traveling monitoring device according to an embodiment of the present invention Electrical configuration diagram of a yarn traveling monitoring device according to an embodiment of a conventional method 1 is a configuration diagram of a yarn traveling monitoring apparatus according to an embodiment of the present invention. Enlarged view of yarn without fluff Diagram showing sensor configuration The figure which shows a mode that a light receiving element is located in a line with the same pitch Equivalent circuit of differential spatial filter element Diagram showing pulses in signal processing circuit

Explanation of symbols

10: Yarn traveling monitoring device 12: Textile machine 14: Yarn 15: Long fiber surface 16: Sensor 18: Light source 20: Differential type spatial filter element 22a, 22b: Light receiving element 24: Differential amplification circuit 26, 27: Signal processing circuit 28: Amplifier circuit 30, 31: Control circuit 32: Fine unevenness 34: Proximity switch 36: Pulse counting means 37: Determination means 38: Threshold setting pulse number storage means 39: Threshold search time setting unit 40: Threshold Setting means 41: input threshold value storage means

Claims (9)

A light source that illuminates the yarn,
Light corresponding to the change in the shadow of the yarn irradiated with light, arranged in the direction opposite to the light source with respect to the yarn, and two series of light receiving elements arranged alternately at the same pitch in the running direction of the yarn A differential spatial filter element that outputs current;
An amplifier circuit that converts the photocurrent into current-voltage, converts the current-voltage converted voltage into a pulse after waveform shaping, and
Means for counting the number of said pulses;
A yarn traveling monitoring device in a textile machine, comprising: a judging means for judging a yarn running abnormality using the number of pulses;
The determination means is
A threshold search time setting unit for setting a period for performing threshold search;
Threshold setting pulse number storage means for storing the number of pulses for each constant feed amount of the yarn detected within the set threshold search time as a threshold setting pulse number;
See containing and a threshold setting means for setting a threshold value for determining a running abnormality on the basis of the number of pulses for the threshold setting,
The yarn traveling monitoring apparatus, wherein the threshold search time setting unit sets a time for performing threshold search based on a timer or the number of stitches in the textile machine . A light source that illuminates the yarn,
Light corresponding to the change in the shadow of the yarn irradiated with light, arranged in the direction opposite to the light source with respect to the yarn, and two series of light receiving elements arranged alternately at the same pitch in the running direction of the yarn A differential spatial filter element that outputs current;
An amplifier circuit that converts the photocurrent into current-voltage, converts the current-voltage converted voltage into a pulse after waveform shaping, and
Means for counting the number of said pulses;
A yarn traveling monitoring device in a textile machine, comprising: a judging means for judging a yarn running abnormality using the number of pulses;
The determination means is
A threshold search time setting unit for setting a period for performing threshold search;
Threshold setting pulse number storage means for storing the number of pulses for each constant feed amount of the yarn detected within the set threshold search time as a threshold setting pulse number;
Threshold setting means for setting a threshold for determining running abnormality based on the threshold setting pulse number,
The yarn travel monitoring device, wherein the threshold search time setting unit manually sets the start and stop of the threshold search when setting the threshold. A yarn travel monitoring device according to claim 1 or claim 2 ,
The threshold search time setting unit
A yarn travel monitoring device characterized in that a threshold search standby time can be set. A yarn travel monitoring device according to claim 1 to claim 3 ,
The threshold value setting means searches for a minimum value in the pulse number stored in the threshold setting pulse number storage means, and a minimum value search means;
A yarn travel monitoring device, comprising: threshold setting means for setting a threshold based on the threshold setting reference value using the minimum value as a threshold setting reference value. The yarn traveling monitoring device according to claim 4 ,
The minimum value search means compares the minimum value that can be placed in the pulse number stored in the threshold setting pulse number storage means with the next smaller value, and when the difference is larger than a preset value, the previous minimum value is regarded as an abnormal value. The yarn is characterized by being a threshold setting reference value search means for obtaining a threshold setting reference value by repeating the operation of deleting and setting the second smallest value as a threshold setting reference value until the threshold setting reference value is not changed. Article running monitoring device. The yarn traveling monitoring device according to claim 5 ,
The yarn traveling monitoring apparatus, wherein the threshold setting means based on the threshold setting reference value is a threshold setting means having a value obtained by subtracting a predetermined value from the threshold setting reference value as a threshold. A yarn travel monitoring device according to claim 1 to claim 3 ,
Means for obtaining an average value and a standard deviation in the number of pulses stored in the threshold setting pulse number storage means by the threshold setting means;
A yarn travel monitoring device comprising means for determining a threshold value using the average value and the standard deviation. A yarn travel monitoring device according to claim 1 to claim 7 ,
The threshold search time setting unit starts and stops threshold search according to the movement of the textile machine,
The threshold value setting means includes means for monitoring whether the detected threshold value setting pulse number average value or minimum value changes, and determining whether or not to reset the threshold value. Monitoring device. The yarn traveling monitoring device according to claim 1 to 8 , wherein the sewing machine generates a sewing pulse in response to an operation of sewing one stitch provided in the textile machine.
Means for comparing the timing of the pulse and the sewing pulse by the output of the differential spatial filter element, and determining a running abnormality of the yarn according to the operation in which the textile machine performs one stitch sewing;
Yarn travel monitoring device.

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