Abnormality monitoring device for wire material

Abstract

To determine a cause of wire breakage of a wire material, which is likely to break in an extension direction thereof, by enabling conditions in which the wire material is placed before the wire material breaks to be grasped.SOLUTION: There is provided an abnormality monitoring device for a wire material, comprising: tension detection means 11 for detecting a tension applied in an extension direction of a yarn that may be broken in the extension direction; tension recording means 12 for recording tension detected by the tension detection means 11 for the latest predetermined time period; abnormality detection means 13 for detecting an abnormal state in which the yarn is broken or an abnormal state that leads to the breakage of the yarn; and pre-abnormal tension storage means 14 for storing tension data recorded by the tension recording means 12 at the time when an abnormal condition is detected by the abnormality detection means 13.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to an abnormality monitoring device for linear materials such as threads and electric wires.

Background Art

[0002] Patent Document 1 discloses an invention in which the tension of a thread wound around a winding roller is detected by a load sensor, and when the time during which the tension has decreased exceeds a set time, it is detected as a thread break.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the invention of Patent Document 1, it is possible to take measures against a thread break. However, it is not possible to investigate the cause of the thread break with that invention.

[0005] An object of the present invention is to be able to investigate the cause of a linear material reaching a disconnection by being able to grasp the situation in which the linear material is placed until the linear material, which may disconnect in the extending direction, reaches a disconnection.

Means for Solving the Problems

[0006] The abnormality monitoring device for a linear material according to the first invention of the present invention includes: a tension detection means for detecting a tension applied in the extending direction of a linear material that may disconnect in the extending direction; a tension recording means for recording the tension detected by the tension detection means for a latest predetermined time; an abnormality detection means for detecting an abnormal state in which the linear material has disconnected or an abnormal state leading to a disconnection; and an abnormal pre-tension storage means for storing the tension data recorded by the tension recording means at that time when an abnormal state is detected by the abnormality detection means.

[0007] According to the first invention, when an abnormal state is detected by the abnormality detection means, the tension data of the wire rod for a predetermined time before the abnormality detection is stored and made displayable. Therefore, when an abnormality such as a breakage of the wire rod occurs, it is possible to easily investigate the cause of the abnormality based on the tension data immediately before the occurrence of the abnormality that has been stored.

[0008] According to a second invention of the present invention, in the first invention, the abnormality detection means detects that the wire rod is in an abnormal state of breakage when the time during which the amplitude of the tension detected by the tension detection means is within the set range continues for a set time or more.

[0009] According to the second invention, the tension signal detected by the tension detection means is processed to detect the breakage of the wire rod. Therefore, the apparatus can be configured without separately providing a sensor for detecting the breakage of the wire rod.

[0010] According to a third invention of the present invention, in the first invention, the abnormality detection means detects that the wire rod is in an abnormal state of breakage when the standard deviation of the tension detected by the tension detection means is equal to or less than a first predetermined value or equal to or greater than a second predetermined value.

[0011] According to the third invention, similar to the second invention, the tension signal detected by the tension detection means is processed to detect the breakage of the wire rod. Therefore, the same operational effects as those of the second invention are achieved. Moreover, in the third invention, when the standard deviation of the tension signal becomes abnormally small or abnormally large, the breakage of the wire rod is detected. Therefore, even if the wire rod breaks upstream or downstream of the tension sensor and the wire rod remains in the tension sensor at that time, the breakage can be detected. Also, even if the wire rod breaks near the tension sensor and the wire rod disappears from the tension sensor, the breakage can be detected.

[0012] According to a fourth invention of the present invention, in the first invention, the abnormality detection means detects that the wire rod is in an abnormal state leading to breakage when the tension signal detected by the tension detection means is equal to or greater than a set value.

[0013] According to the fourth invention, a tension signal detected by the tension detecting means is processed to detect an abnormal increase in tension leading to a break in the wire or strip material. Therefore, an abnormal state can be detected at an early stage before the wire or strip material breaks.

[0014] The fifth invention of the present invention is, in any one of the first to fourth inventions, when an abnormal state is detected by the abnormality detecting means, an abnormal post-tension storage means for storing the tension data detected by the tension detecting means for a predetermined time from that point in time.

[0015] According to the fifth invention, when an abnormal state is detected by the abnormality detecting means, in addition to the tension data of the wire or strip material for a predetermined time before the abnormality detection, the tension data of the wire or strip material for a predetermined time after the abnormality detection is also stored and made displayable. Therefore, when an abnormality such as a break in the wire or strip material occurs, by comparing the tension data before and after the occurrence of the abnormality, the cause of the occurrence of the abnormality can be easily investigated.

[0016] The sixth invention of the present invention is, in any one of the first to fourth inventions, the tension detecting means includes a tension sensor that detects the tension applied in the extending direction of the wire or strip material, and the tension sensor includes a Hall element that generates a voltage corresponding to the magnitude of the magnetic field by receiving the magnetic field and the Hall effect, a sensor body that holds the Hall element, and is provided on the sensor body so that the wire or strip material passes through a predetermined position. A wire or strip material passage including an inlet passage on the side where the wire or strip material enters from outside the sensor body and an outlet passage on the side where the wire or strip material exits outside the sensor body, and contacting the wire or strip material between the inlet passage and the outlet passage, and the wire or strip material is biased in a direction intersecting the extending direction of the wire or strip material from a path connecting the inlet passage and the outlet passage in a straight line. A biasing body, a leaf spring that elastically supports the biasing body on the sensor body so that the biasing body is biased toward the biased position and the distance to the Hall element changes due to elastic deformation caused by the tension of the wire or strip material received by the biasing body when contacting the wire or strip material, and a permanent magnet fixed to the biasing body and applying a magnetic field to the Hall element.

[0017] According to the sixth invention, the deflection position of the deflecting body of the tension sensor changes according to the change in the tension of the wire strip, and the output voltage from the Hall element changes due to this change. Therefore, the tension sensor can detect subtle changes in tension with high sensitivity. Accordingly, it is possible to accurately monitor the abnormality of the wire strip based on the change in the tension of the wire strip. Moreover, since the main components of the tension sensor are constituted by a leaf spring, a permanent magnet, and a Hall element, the configuration of the tension sensor can be simplified and it can be manufactured at low cost.

[0018] According to the seventh invention of the present invention, in the sixth invention, the leaf spring is a strip-shaped body having one end fixed to the sensor body and the other end fixed to the deflecting body. The leaf spring is arranged such that the strip-shaped plate surface intersects obliquely with respect to the wire strip passing linearly through the inlet passage and the outlet passage, with one end on the inlet passage side from the other end and on the side away from the wire strip passing linearly through the inlet passage and the outlet passage, and the other end on the outlet passage side from the one end and on the intersecting side with respect to the wire strip passing linearly through the inlet passage and the outlet passage. A stopper, which is more rigid than the leaf spring, is fixed to the side of the plate surface of the leaf spring facing the wire strip so as to abut against the leaf spring to prevent the leaf spring from deflecting toward the wire strip side. The stopper extends along the wire strip in the direction from the one end to the other end of the leaf spring through the deflecting body midway between the inlet passage and the outlet passage, and has a slit with the other end side open.

[0019] According to the seventh invention, a stopper is provided on the wire strip side of the leaf spring. Therefore, the leaf spring is prevented from deflecting toward the wire strip side more than the stopper when vibrating due to fluctuations in the tension of the wire strip. Therefore, it is possible to prevent the leaf spring from applying an excessive tension to the wire strip due to its vibration and to prevent the tension sensor from having an adverse effect on the wire strip. Further, a slit is formed in the stopper, and the slit is formed along the wire strip. Therefore, it is possible to suppress the wire strip from deflecting and contacting the stopper, and to suppress a decrease in the accuracy of tension detection by the tension sensor.

Brief Description of the Drawings

[0020]

Figure 1

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Figure 15

Embodiments for Carrying Out the Invention

[0021] <Overall Configuration of an Embodiment> Figure 1 shows an embodiment of an abnormality monitoring device for a wire material. This abnormality monitoring device monitors for wire breakage and abnormal increases in tension of wire materials in the manufacturing processes of fibers and electric wires, and in the fiber supply processes of looms and knitting machines. Figure 1 is a block diagram of the electrical circuit in the abnormality monitoring device. Tension signals are input from two tension sensors 20 to a computer that forms the abnormality monitoring device main body 10, and display signals and alarm signals are output from the computer to a display device 31 and an alarm device 32 to operate the display device 31 and the alarm device 32. Here, two tension sensors 20 are provided, but the necessary number can be provided as required. The tension sensors 20 detect the tension received in the extending direction of a long-extended wire material such as a thread or an electric wire. The computer receives the tension signals detected by the tension sensors 20, determines that a wire break has occurred in the wire material when the tension is abnormally low, and also determines that an abnormal state leading to a wire break in the wire material has occurred when the tension is abnormally high.

[0022] <Application Example of an Embodiment> Figure 2 shows an example of applying the above abnormality monitoring device to the spinning process of chemical fibers. In Figure 2, an extruder 51 extrudes a resin, which is a fiber material, toward each spinning nozzle 52, and a plurality of fibers extruded from each spinning nozzle 52 are gathered as one yarn 56 and wound by each winding machine 55. Tension sensors 20 are respectively disposed between each spinning nozzle 52 and each winding machine 55, and each tension sensor 20 is configured to detect the tension of the yarn 56 immediately before being wound by each winding machine 55, guided by a roller 53 and a guide 54.

[0023] Figure 3 shows an example of applying the above abnormality monitoring device to the weft supply device of a loom. In Figure 3, each weft 64 unwound from each yarn package 61 is supplied to a loom 63 through each weft supply device 62. Tension sensors 20 are respectively disposed between each weft supply device 62 and the loom 63, and each tension sensor 20 is configured to detect the tension of each weft 64 immediately before being supplied from each weft supply device 62 to the loom 63.

[0024] Although the application example of the abnormality monitoring device has been described with reference to FIGS. 2 and 3, the abnormality monitoring device for the wire material of the present invention can also be applied as an abnormality monitoring device for the wire material of various other devices.

[0025] <Configuration of the tension sensor> FIGS. 4 and 5 show a specific example of the tension sensor 20. This tension sensor 20 is a type of sensor that detects the output signal of the Hall element 23 as the tension of the yarn 40. The Hall element 23 is fixed to the bottom of the sensor body 21 formed in a substantially rectangular container shape. In FIGS. 4 and 5, it is described such that the bottom of the container-shaped sensor body 21 is on the upper side in the vertical direction and the outer peripheral edge portion is on the lower side. On the outer peripheral edge portion of the container-shaped sensor body 21, flange portions 21b protruding in two mutually opposing outer directions as shown in FIG. 4 are integrally formed, and the sensor body 21 can be fixed to an appropriate fixing member (not shown) by these flange portions 21b. The sensor body 21 is integrally formed of ceramics.

[0026] On two mutually opposing sides where the flange portions 21b are not formed on the outer peripheral edge portion of the sensor body 21, stainless steel support plates 22c constituting the wire material passage 22 are respectively fixed by caulking pins 22d. Each support plate 22c is formed with a through hole through which the yarn 40, which is the wire material, passes. The through hole is a notch hole opened outward so as to facilitate the insertion of the yarn 40 into the through hole, and is formed by the notch 22e. On the portion of the through hole through which the yarn 40 passes, ceramic inlet passages 22a and outlet passages 22b are fitted.

[0027] As shown by the phantom line in Fig. 5, the yarn 40 that enters from the inlet passage 22a and exits from the outlet passage 22b within the space sandwiched by each support plate 22c passes through a path that directly connects the two passages 22a and 22b. However, a biasing body 24 is disposed below the yarn 40 to bias the yarn 40 to be bent rather than straight. The biasing body 24 has a biasing body main body 24a formed in a gutter shape from ceramics, and a ceramic roller 24b is rotatably held within the gutter shape of the biasing body main body 24a. The biasing body main body 24a is fixed to the upper surface of the sensor main body 21 by a caulking pin 26c by a leaf spring 26 made of spring steel and is elastically supported. The leaf spring 26 is a strip-shaped body formed long along the yarn 40, and one end thereof is inclined and fixed at a position close to the inlet passage 22a below the yarn 40. The other end of the leaf spring 26 is fixed to the biasing body main body 24a by a caulking pin 26b. The leaf spring 26 is arranged such that the end fixed to the sensor main body 21 is at a separated position with respect to the yarn 40 that linearly connects the inlet passage 22a and the outlet passage 22b, the other end fixed to the biasing body main body 24a is close, and it is inclined so as to intersect the yarn 40. Therefore, the roller 24b is in contact with the yarn 40 and biases the yarn 40 to the side away from the sensor main body 21 with respect to the position that linearly connects the inlet passage 22a and the outlet passage 22b. Therefore, as shown in Fig. 5, the middle of the inlet passage 22a and the outlet passage 22b of the yarn 40 is pushed out to the side away from the sensor main body 21 by contact with the roller 24b. At this time, the leaf spring 26 receives the tension of the yarn 40 via the roller 24b and elastically deforms, and biases the biasing body 24 toward the biasing position by the spring force of the leaf spring 26.

[0028] On the side of the wire 40 of the leaf spring 26, a flat stainless steel stopper 26a, which is a rigid body compared to the leaf spring 26, is arranged in contact with the leaf spring 26. The stopper 26a is fixed to the sensor body 21 together with one end of the leaf spring 26 by a caulking pin 26c. As shown in FIGS. 4 and 6, a slit 26d extending from one end side to the other end side of the leaf spring 26 and having the other end side open is formed in the stopper 26a. On the other hand, the leaf spring 26 forms a constricted portion 26e with a narrow width at a position overlapping the slit 26d between the one end and the other end. The constricted portion 26e is formed as a result of the expansion of its width due to the caulking connection of one end and the other end of the leaf spring 26 by the caulking pins 26c and 26b. As shown in FIG. 6, the width W1 of the constricted portion 26e of the leaf spring 26 is made larger than the width W2 of the slit 26d, and both side portions in the width direction of the constricted portion 26e are in contact with the stopper 26a at both edge portions in the width direction of the slit 26d. The stopper 26a including the slit 26d is sized to generally cover the entire constricted portion 26e of the leaf spring 26. The output voltage of this Hall element 23 becomes the output signal of the tension sensor 20.

[0029] As shown in FIGS. 5 and 6, a permanent magnet 25 is fixed to the side of the bias body main body 24a facing the sensor body 21. Since the permanent magnet 25 presses the leaf spring 26 toward the sensor body 21 via the bias body 24 and causes it to bend according to the strength of the tension of the wire 40, the distance from the Hall element 23 becomes closer according to the strength of the tension of the wire 40. Therefore, the Hall element 23 generates a voltage according to the strength of the tension of the wire 40 under the influence of the magnetic field of the permanent magnet 25.

[0030] The tension sensor 20 bends the leaf spring 26 according to the strength of the tension of the wire 40, and detects the amount of bending by the Hall element 23. Therefore, the tension sensor 20 can detect minute tension changes with high sensitivity. Accordingly, abnormal monitoring of the wire 40 based on the tension change of the wire 40 can be performed with high accuracy. Moreover, since the main components of the tension sensor 20 are constituted by the leaf spring 26, the permanent magnet 25, and the Hall element 23, the configuration of the tension sensor 20 can be simplified and manufactured at low cost.

[0031] Further, a stopper 26a is provided on the side of the wire 40 of the leaf spring 26. Therefore, the leaf spring 26 is prevented from deflecting toward the wire 40 side from the stopper 26a when vibrating due to fluctuations in the tension of the wire 40. Therefore, it is possible to prevent the leaf spring 26 from applying an excessive tension to the wire 40 due to its vibration, and prevent the tension sensor 20 from having an adverse effect on the wire 40. Further, a slit 26d is formed in the stopper 26a, and the slit 26d is formed along the wire 40. Therefore, it is possible to suppress the wire 40 from deflecting and contacting the stopper 26d, and suppress a decrease in the accuracy of tension detection by the tension sensor 20.

[0032] <Function overview of the computer> FIG. 7 shows an overview of functions realized by a program of a computer that forms the abnormality monitoring device main body 10. In FIG. 7, the tension detection means 11 detects the tension of the wire 40 by receiving a signal from the tension sensor 20. The tension recording means 12 records the latest predetermined time of the tension detected by the tension detection means 11. On the other hand, the abnormality detection means 13 detects an abnormal state in which the wire 40 is disconnected or an abnormal state leading to disconnection. The pre-abnormality tension storage means 14 stores the tension data recorded by the tension recording means 12 at that time when an abnormal state is detected by the abnormality detection means 13. The alarm 32 is activated when an abnormal state is detected by the abnormality detection means 13 to notify an operator or a monitor of the occurrence of the abnormal state.

[0033] Since the computer functions in this way, when an abnormal state is detected by the abnormality detection means 13, the pre-abnormality tension storage means 14 stores the tension data of the wire 40 for a predetermined time before the detection of the abnormality and makes it displayable. Therefore, when an abnormality such as disconnection of the wire 40 occurs, it is possible to easily investigate the cause of the abnormality based on the tension data immediately before the occurrence of the abnormality stored in the pre-abnormality tension storage means 14.

[0034] In FIG. 7, when an abnormal post-tension storage means 15 detects an abnormal state by an abnormality detection means 13, it stores the tension data detected by a tension detection means 11 for a predetermined time from that point. Therefore, when the abnormal state is detected by the abnormality detection means 13, in addition to the tension data of the wire rod for a predetermined time before the detection of the abnormality, the tension data of the yarn 40 for a predetermined time after the detection of the abnormality is also stored and can be displayed. Accordingly, when an abnormality such as a breakage of the yarn 40 occurs, it is possible to easily investigate the cause of the occurrence of the abnormality by comparing the tension data before and after the occurrence of the abnormality.

[0035] <Abnormal Tension Data Display Program> FIG. 8 shows a program that displays the tension data before and after an abnormality of the yarn 40 among computer programs. When this program is started, in step S1, it is determined whether or not the flag F is set. Since the flag F is cleared in the initial setting, step S1 is negatively determined, and in step S2, the latest predetermined time of the tension detected by the tension sensor 20 is recorded. Next, in step S3, it is determined whether or not a breakage detection or an abnormality detection is performed by a breakage detection program or an abnormality detection program described later and a breakage signal or an abnormality signal is output. If any of the signals is output and step S3 is affirmatively determined, the tension data recorded in step S2 is stored in step S4 and displayed on the display device 31. Also, in step S5, the alarm 32 is activated. The operation of the alarm 32 notifies the operator or the monitor of the occurrence of a breakage or an abnormality. Subsequently, in step S6, it is stored that the flag F is set and a breakage signal or an abnormality signal is output.

[0036] In a state where the flag F is set, step S1 is affirmatively determined, so in step S7, the tension data for a predetermined time from that point is stored and displayed on the display device 31. When step S7 is executed, the flag F is cleared in step S8 and returned to the initial state.

[0037] In the program of FIG. 8, the process of step S2 corresponds to the tension recording means 12 of FIG. 7, the process of step S4 corresponds to the pre-abnormal tension storage means 14 of FIG. 7, and the process of step S7 corresponds to the post-abnormal tension storage means 15 of FIG. 7.

[0038] <Wire break detection program A> FIG. 9 shows the wire break detection program A for the yarn 40 among computer programs. When this program is started, it is determined whether or not the flag F is in a cleared state at step S17. Since the flag F is cleared in the initial state, step S17 is affirmatively determined, the timer T is started at step S18, and the flag F for storing that the timer T is in an activated state is set at step S19. When the flag F is set, thereafter, step S17 is negatively determined, and the processes of step S18 and step S19 are skipped.

[0039] Next, at step S11, the output signal from the tension sensor 20 is captured. The captured signal is a pulsating signal as shown in the period of t1 of "Output of tension sensor 20" in FIG. 10 when the yarn 40 is normal. Then, at step S12, it is determined whether or not the output signal of the tension sensor 20 captured at step S11 is equal to or greater than the 11th set value VT11. At this time, if the output signal of the tension sensor 20 is smaller than the 11th set value VT11, step S12 is negatively determined, and at step S13, it is determined whether or not the output signal of the tension sensor 20 is equal to or less than the 12th set value VT12. At this time, if the output signal of the tension sensor 20 is greater than the 12th set value VT12, step S13 is negatively determined, and at step S15, it is determined whether or not the timer T is equal to or greater than the set time TH. As shown by "Output of timer T" in the period of t1 in FIG. 10, while the output signal of the tension sensor 20 is pulsating normally, the time during which the output signal of the tension sensor 20 is between the 11th set value VT11 and the 12th set value VT12 is short. Therefore, before the timer T reaches the set time TH, step S12 or step S13 is affirmatively determined, the timer T is reset at step S14, and the flag F is cleared.

[0040] However, when the tension of the yarn 40 becomes weak and approaches or reaches the state of breaking, as shown in the period t2 of the "Tension Sensor 20 Output" in FIG. 10, the pulsation of the output signal of the tension sensor 20 almost disappears. Therefore, the time during which the output signal of the tension sensor 20 is at a level between the 11th set value VT11 and the 12th set value VT12 becomes long. As shown in the "Timer T Output" during the period t2 in FIG. 10, the timer T reaches the set time TH or more, step S15 is judged affirmatively, and a disconnection signal is output in step S16. The state where the disconnection signal is output during the period t2 in FIG. 10 is shown.

[0041] In the program of FIG. 9, the output signal of the tension sensor 20 between the 11th set value VT11 and the 12th set value VT12 corresponds to a signal within the set width range in the present invention.

[0042] <Disconnection Detection Program B> FIG. 11 shows the disconnection detection program B for the yarn 40 in the computer program. It is a program for detecting the disconnection of the yarn 40 by an algorithm different from the above-described disconnection detection program A.

[0043] When this program is started, in step S21, the output signal from the tension sensor 20 is sampled at regular intervals and the latest N samples are stored. In the next step S22, the standard deviation S of the N samples of the output signal from the tension sensor 20 sampled in step S21 is calculated. The standard deviation S is calculated by the well-known following formula.

Equation

[0044] FIG. 12 shows the output signal from the tension sensor 20, and FIG. 13 shows the standard deviation S of the output signal from the tension sensor 20. When the yarn 40 breaks upstream or downstream of the tension sensor 20 and the yarn 40 remains in the tension sensor 20 at that time, the pulsation of the output of the tension sensor 20 becomes small as shown in the period of t3 in FIG. 12. Therefore, the standard deviation S calculated in step S22 gradually decreases as in the period of t3 in FIG. 13. In step S23, it is determined whether the standard deviation S is less than or equal to a first predetermined value ST1. When the standard deviation S becomes less than or equal to the first predetermined value ST1, step S23 is affirmatively determined, and a disconnection signal is output in step S25.

[0045] Also, when the yarn 40 breaks at the timing of t4 in FIG. 12 and the yarn 40 disappears from the biasing body 24 of the tension sensor 20, the output signal of the tension sensor 20 suddenly becomes zero. Therefore, as shown in FIG. 13, in the period of t5 after t4, the standard deviation S calculated in step S22 suddenly increases. At this time, step S23 is negatively determined, and it is determined in step S24 whether the standard deviation S is greater than or equal to a second predetermined value ST2. When the standard deviation S becomes greater than or equal to the second predetermined value ST2 in the period of t5 as shown in FIG. 13, step S24 is affirmatively determined, and a disconnection signal is output in step S25. When the standard deviation S is between the first predetermined value ST1 and the second predetermined value ST2, both steps S23 and S24 are negatively determined, and the process of step S25 is skipped. The state in which a disconnection signal is output in the periods of t3 and t5 in FIG. 13 is shown.

[0046] <Abnormality Detection Program> FIG. 14 shows a program for detecting an abnormal state leading to the breakage of the yarn 40 in a computer program. It is a program for detecting an abnormality of the yarn 40 with an algorithm different from the above-described disconnection detection programs A and B.

[0047] When this program is started, in step S11, the output signal from the tension sensor 20 is captured. The captured signal pulsates as shown in the period of t6 of "Tension Sensor 20 Output" in FIG. 15 when the yarn 40 is normal. Then, in step S31, it is determined whether the output signal of the tension sensor 20 captured in step S11 is equal to or greater than the second set value VT2. As shown in "Tension Sensor 20 Output" in FIG. 15, there is no abnormality in the yarn 40 during the period indicated by t6, and the output signal of the tension sensor 20 is smaller than the second set value VT2. Therefore, step S31 is negatively judged. However, when the output signal of the tension sensor 20 becomes equal to or greater than the second set value VT2 as in the period indicated by t7 in FIG. 15, step S31 is positively judged, and an abnormal signal is output in step S32. This state is where the tension of the yarn 40 has become abnormally large for some reason, and the tension sensor 20 has detected this state. At this time, as shown in "Abnormal Signal" in FIG. 15, an abnormal signal is being output.

[0048] <Application of Disconnection Detection Programs A and B and Abnormal Detection Program> In the computer of the abnormality monitoring device main body 10 of one embodiment, it is equipped with all of the disconnection detection programs A and B and the abnormal detection program respectively described based on FIGS. 9, 11, and 14. Therefore, in step S3 of the abnormal tension data display program described based on FIG. 8, when a disconnection detection signal or an abnormal signal is output from any of the above disconnection detection programs A and B and the abnormal detection program, the process proceeds to step S4. Therefore, the disconnection detection programs A and B and the abnormal detection program in FIGS. 9, 11, and 14 correspond to the abnormality detection means 13 in FIG. 7. In the disconnection detection program A in FIG. 9, a state where the yarn 40 has broken while remaining on the tension sensor 20 is detected. Also, in the disconnection detection program B in FIG. 11, a state where the yarn 40 has broken while remaining on the tension sensor 20 and a state where the yarn 40 has broken without remaining on the biasing body 24 of the tension sensor 20 are detected. Further, in the abnormal detection program in FIG. 14, a state where the tension has become abnormally high so that the yarn 40 leads to disconnection is detected. These detection programs can be appropriately selected and used as needed.

[0049] <Other Embodiments> In addition to the above embodiments, the present invention can be implemented in various forms. For example, in the above embodiment, the abnormality detection means processes the output of the tension sensor to detect an abnormal state, but a thread break sensor that directly detects a thread break may be used as the abnormality detection means. Further, in the above embodiment, the tension sensor uses a Hall element, but it may be configured by attaching a strain gauge to a leaf spring instead of the Hall element. Furthermore, in the above embodiment, the tension data stored by the pre-abnormality tension storage means and the post-abnormality tension storage means is displayed by a display device. However, each storage means may only store the tension data, and the display may read and display the stored data as needed. Also, in the above embodiment, an alarm is activated when the abnormality detection means detects an abnormal state, but the alarm is not essential. Additionally, in the above embodiment, the post-abnormality tension storage means is provided, but the post-abnormality tension storage means is not essential.

Explanation of Reference Numerals

[0050] 10 Abnormality monitoring device main body 11 Tension detection means 12 Tension recording means 13 Abnormality detection means 14 Pre-abnormality tension storage means 15 Post-abnormality tension storage means 20 Tension sensor 21 Sensor body 21a Depression 21b Flange portion 22 Linear material passage 22a Inlet passage 22b Outlet passage 22c Support plate 22d Caulking pin 22e Notch 23 Hall element 24 Biasing body 24a Biasing body main body 24b Roller 25 Permanent magnet 26 Leaf spring 26a stopper 26b, 26c caulking pins 26d slit 26e constriction part 31 display device 32 alarm 40 yarn (wire rod) 51 extruder 52 spinning nozzle 53 roller 54 guide 55 winder 56 yarn (wire rod) 61 yarn package 62 weft supply device 63 loom 64 weft

Claims

1. Tension detection means for detecting the tension applied in the extending direction of a wire-like material that may be disconnected in the extending direction, Tension recording means for recording the tension detected by the tension detection means for a latest predetermined period of time, Abnormality detection means for detecting an abnormal state in which the wire-like material is disconnected or an abnormal state leading to disconnection, When an abnormal state is detected by the abnormality detection means, abnormality pre-tension storage means for storing the tension data recorded by the tension recording means at that time, An abnormal monitoring device for a wire-like material comprising the above.

2. In Claim 1, The abnormality detection means detects that the wire-like material is in an abnormal state of disconnection when the time during which the amplitude of the tension detected by the tension detection means is within a set range continues for a set time or more. An abnormal monitoring device for a wire-like material.

3. In Claim 1, The abnormality detection means detects that the wire-like material is in an abnormal state of disconnection when the standard deviation of the tension detected by the tension detection means is equal to or less than a first predetermined value or equal to or more than a second predetermined value. An abnormal monitoring device for a wire-like material.

4. In Claim 1, The abnormality detection means detects that the wire-like material is in an abnormal state leading to disconnection when the tension detected by the tension detection means is equal to or more than a set value. An abnormal monitoring device for a wire-like material.

5. In any one of Claims 1 to 4, When an abnormal state is detected by the abnormality detection means, it comprises abnormality post-tension storage means for storing the tension data detected by the tension detection means for a predetermined period of time from that time. An abnormal monitoring device for a wire-like material.

6. In any one of Claims 1 to 4, The tension detection means includes a tension sensor for detecting the tension applied in the extending direction of the wire-like material, The tension sensor A Hall element that receives a magnetic field and generates a voltage corresponding to the magnitude of the magnetic field by the Hall effect, A sensor body that holds the Hall element, A wire-like material passage provided in the sensor body, including an inlet passage on the side where the wire-like material enters from outside the sensor body and an outlet passage on the side where the wire-like material exits outside the sensor body, such that the wire-like material passes through a predetermined position, A biasing body that contacts the wire-like material between the inlet passage and the outlet passage and biases the wire-like material in a direction intersecting the extending direction of the wire-like material from a path that linearly connects the inlet passage and the outlet passage. The biasing body is biased toward a biased position, and is elastically supported by a leaf spring on the sensor body such that when contacting the wire strip, the biasing body is elastically deformed by the tension of the wire strip received by the biasing body, and the distance to the Hall element changes. A permanent magnet fixed to the biasing body and applying a magnetic field to the Hall element. An abnormal monitoring device for a wire strip comprising the above.

7. In claim 6, The leaf spring is a strip-shaped body with one end fixed to the sensor body and the other end fixed to the biasing body. The leaf spring is arranged such that the strip-shaped plate surface obliquely intersects the wire strip passing straight through the inlet passage and the outlet passage, with one end on the inlet passage side and away from the wire strip passing straight through the inlet passage and the outlet passage, relative to the other end, and the other end on the outlet passage side and intersecting the wire strip passing straight through the inlet passage and the outlet passage. On the side of the plate surface of the leaf spring facing the wire strip, a stopper, which is a rigid body compared to the leaf spring, is fixed to abut so as to prevent the leaf spring from deflecting toward the wire strip side. The stopper extends in the direction from one end to the other end of the leaf spring along the wire strip passing through the middle between the inlet passage and the outlet passage via the biasing body, and includes a slit with the other end side open. An abnormal monitoring device for a wire strip.

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