JP2006002300A - Method for detecting abnormality of drafting apparatus in spinning machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for detecting occurrence of abnormality in a drafting apparatus at the time of spinning by a simple constitution without storing accurate standard values. <P>SOLUTION: The drafting apparatus 11 drives a front bottom roller 12, a middle bottom roller 13, a back bottom roller 14 by using two driving motors 16a and 16b for front rollers, driving motors 17a and 17b for middle rollers and driving motors 18a and 18b for back rollers. Each driving motor is subjected through inverters 19a and 19b, etc., to speed change control. A current sensor SA is provided in each inverter 19a, 19b, etc. The current sensor SA detects the amount of the current fed in accordance with load torque of each driving motor 16a, 16b, etc. A CPU31 determines to be abnormal when the variation of load torque of two motors for driving each back roller is each deviated from a set range. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an abnormality detection device for a draft device in a spinning machine, and more particularly to an abnormality detection device for a draft device in a spinning machine in which a draft roller is driven by a plurality of motors.

  In general, the draft device used in spinning machines such as ring spinning machines and roving machines is a three-wire system consisting of a front roller, a middle roller and a back roller, and the front bottom roller, middle bottom roller and back bottom roller are driven by a single motor. Is done. However, in order to make it easy to change the draft rate, a device with a configuration in which the front bottom roller and the back bottom roller are driven by separate motors, or the machine base length is increased due to the increase in the number of spindles. There is also an apparatus having a configuration in which motors are provided at both ends of the machine and the bottom roller is driven from both sides of the machine base.

  In this type of draft device, the feed material may be wound around the draft roller or the apron may be caught in the draft roller for some reason. If the drive is continued as it is, the components of the draft device may be damaged. There is a case.

  When the supply material is wound around the draft roller as described above, the load acting on the motor becomes excessive, an overcurrent flows through the motor, and the temperature rises. Conventionally, by detecting that the overcurrent or the motor temperature has become equal to or higher than a predetermined temperature and stopping the operation of the machine base, it has been prevented that the parts are damaged. However, in this abnormality detection method, there is a problem that even if an abnormality occurs on the draft device side, the motor is continuously driven in a state where the motor is not overloaded, and there is a possibility that the parts of the draft device may be damaged. For example, when the same motor is installed in a machine base with different specifications, the load in the overload state of the draft device becomes smaller than the allowable load of the motor depending on the specifications of the machine base. (For example, refer to Patent Document 1).

In general, the bottom roller of the draft rollers is formed in a single line shaft shape by connecting a plurality of roller shafts to each other by screwing a male screw portion and a female screw portion formed at the ends thereof. And, the direction of the screw is configured so as to be tightened depending on the direction of the load applied to the bottom roller, but due to fluctuations in the drafting force etc. Looseness may occur. When loosening occurs, drafting is not performed at a predetermined draft rate. In this state, the load acting on the motor is smaller than that during normal spinning. Therefore, an abnormality cannot be detected by detecting motor overcurrent or motor temperature.
Japanese Unexamined Patent Publication No. 2003-166135 (paragraph numbers [0004] to [0006], FIG. 1)

  As a method for solving the above problem, a load acting on the motor in a normal spinning state is detected in advance by a test operation, and the value is stored in a storage device as a reference value, and the load acting on the motor at the time of spinning. A method of comparing the value with the reference value and determining an abnormality when the difference exceeds a preset amount is conceivable. However, the load acting on the motor may vary depending on the spinning conditions. For example, even when the spinning speed is the same between cotton spinning and synthetic fiber spinning, the load acting on the motor is different. Moreover, the load which acts on a motor changes with counts. Therefore, it is necessary to store the reference values corresponding to the spinning conditions.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and its purpose is a draft in a spinning machine that can detect an abnormality in a drafting device at the time of spinning with a simple configuration without storing a strict reference value. An object of the present invention is to provide a device abnormality detection device.

  In order to achieve the above object, an invention according to claim 1 is an abnormality detection device for a draft device in a spinning machine in which a draft roller is driven by a plurality of motors. And torque detecting means for detecting a load torque of at least two motors of the plurality of motors, and a judging means for determining an abnormality when a deviation of the load torques of the two motors deviates from a set range. And. Here, the “set range” means a value obtained by adding an allowable error to a variation amount of the load torque caused by a thickness variation of the raw material (coarse yarn), and is obtained in advance by a test.

  In this invention, the draft roller is driven by a plurality of motors in the draft device. For example, when the machine base is made up of multiple spindles, drive motors are provided on both sides of the machine base in the longitudinal direction, and each bottom roller is driven from both ends of the machine base, or the bottom roller after the front bottom roller and the middle bottom roller Is driven by a separate motor. Then, a load torque acting on at least two of the plurality of motors is detected by the torque detection means. When the motor drives the same draft roller, the load torque that acts when spinning is normal is equivalent. Further, when driving different draft rollers, the load torque acting in the normal state of spinning is not the same, but even if the spinning conditions are changed, the variation of the deviation is small. Therefore, even if a reference value for determining whether or not the spinning state is abnormal is not set for each spinning condition, an abnormality is detected by comparing the common reference range with the load torque deviation detected by the torque detecting means. Is accurately determined. Therefore, it is possible to detect the occurrence of an abnormality in the drafting device at the time of spinning with a simple configuration without storing a strict reference value.

  According to a second aspect of the present invention, in the first aspect of the present invention, the spinning machine is a spinning machine having draft rollers driven from both sides, and the two motors are motors that drive the draft rollers. is there. In the present invention, for example, a drive motor is provided on both sides in the longitudinal direction of the machine base due to the formation of multiple spindles, and at least one bottom roller is driven from both ends of the machine base. During the operation of the draft device, the load torque acting on the two motors is detected by the torque detection means. In a configuration in which the draft rollers are driven from both sides of the machine base, the load acting on both motors is the same unless an abnormality such as fiber wrapping occurs in the draft device, and the deviation of the load torque is within the set range. Fits in. When the deviation deviates from the set range, it is determined as abnormal by the determination means. Even if the spinning conditions are different, the set range may be the same. Therefore, it is possible to detect the occurrence of an abnormality in the drafting device at the time of spinning with a simple configuration without storing a strict reference value.

  According to a third aspect of the present invention, in the second aspect of the present invention, the draft roller is divided into two at the center in the longitudinal direction. In the present invention, when obtaining the deviation of the load torque of the two motors, for example, it is determined that the load torque of the motor driving the right draft roller is subtracted from the load torque of the motor driving the left draft roller. It can be determined whether the left or right draft roller has an abnormality. That is, if the deviation is negative (minus) and deviated from the set range, it can be estimated that an abnormality such as winding of the fiber around the right draft roller or biting of the apron to the draft roller has occurred, and the deviation is positive ( If it is deviated from the set range by (plus), it can be estimated that the abnormality has occurred in the left draft roller.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the determination means includes a deviation of the load torque of the two motors and a deviation of the load torque of each motor with respect to the normal load torque. Based on this, a draft roller in which an abnormality has occurred is estimated. In the present invention, when the determination means determines abnormality from the deviation of the load torques of the two motors, the load torque of which motor is a normal value based on the deviation of the load torque of each motor with respect to the normal load torque. By determining whether or not there is a deviation, it is possible to more accurately estimate the draft roller in which an abnormality has occurred.

  According to the present invention, it is possible to detect the occurrence of an abnormality in the drafting apparatus at the time of spinning with a simple configuration without storing a strict reference value.

(First embodiment)
Hereinafter, a first embodiment in which the present invention is embodied in a ring spinning machine having a pair of left and right draft devices will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic plan view of a draft device in which a top roller is omitted, and FIG. 2 is a partially broken partial plan view showing a connected state of roller shafts.

  As shown in FIG. 1, the draft device 11 has a three-wire configuration including a front bottom roller 12, a middle bottom roller 13, and a back bottom roller 14 as draft rollers. The front bottom roller 12 is supported at a predetermined position with respect to a roller stand (not shown), and the middle bottom roller 13 and the back bottom roller 14 are fixed to the roller stand so as to be adjustable in the front-rear direction (not shown). ) Is supported through. The middle bottom roller 13 includes an apron (not shown). Further, a front top roller, a middle top roller, and a back top roller (all not shown) are provided in a known configuration corresponding to each of the bottom rollers 12 to 14.

  Each bottom roller 12-14 is divided into two line shafts 12a, 12b, 13a, 13b, 14a, 14b, and each of the two line shafts 12a, 12b, 13a, 13b, 14a, 14b is coaxial. Is placed on top. In this embodiment, each bottom roller 12-14 is divided | segmented in the center of a longitudinal direction, respectively, and each two line shaft 12a, 12b, 13a, 13b, 14a, 14b is formed in the symmetrical shape. As shown in FIG. 2, each line shaft is configured by connecting a plurality of roller shafts 15 to each other by screwing a male screw portion 15 a and a female screw portion 15 b formed at the end portions thereof. In FIG. 2, the line shaft 12a of the front bottom roller 12 is shown.

  In each pair of left and right front bottom rollers 12, a pair of line shafts 12a located on the left side in FIG. 1 is driven by a first front roller drive motor 16a from one end of the machine base, and a pair located on the right side in FIG. The line shaft 12b is driven by the second front roller drive motor 16b from the other end of the machine base. The rotation of the first front roller drive motor 16a is transmitted to each line shaft 12a via a gear train (not shown), and the rotation of the second front roller drive motor 16b is sent to each line shaft 12b via a gear train (not shown). To be communicated to.

  Each pair of left and right middle bottom rollers 13 is also driven by a first middle roller drive motor 17a from a pair of line shafts 13a located on the left side in FIG. The line shaft 13b is driven by the second middle roller driving motor 17b from the other end of the machine base. The rotation of the first middle roller drive motor 17a is transmitted to each line shaft 13a via a gear train (not shown), and the rotation of the second middle roller drive motor 17b is sent to each line shaft 13b via a gear train (not shown). To be communicated to.

  Each of the pair of left and right back bottom rollers 14 also has a pair of line shafts 14a located on the left side in FIG. 1 driven by a first back roller drive motor 18a from one end side of the machine base, and a pair located on the right side in FIG. The line shaft 14b is driven by a second back roller drive motor 18b from the other end of the machine base. The rotation of the first back roller drive motor 18a is transmitted to each line shaft 14a via a gear train (not shown), and the rotation of the second back roller drive motor 18b is transmitted to each line shaft 14b via a gear train (not shown). To be communicated to.

  Each of the drive motors 16a, 16b, 17a, 17b, 18a, 18b is a variable speed motor that is driven and controlled via inverters 19a, 19b, 20a, 20b, 21a, 21b. The inverters 19a, 19b, 20a, 20b, 21a, 21b are controlled by the control device 30. Each inverter 19a, 19b, 20a, 20b, 21a, 21b inputs a direct current obtained by converting a commercial power supply with an AC / DC converter (none of which is shown), and drive motors 16a, 16b, 17a, 17b, 18a, 18b. Is rotated at a predetermined rotation speed, a current corresponding to the load is output. Each inverter 19a, 19b, 20a, 20b, 21a, 21b is equipped with a current sensor SA for detecting the amount of current (motor current amount) flowing through each drive motor 16a, 16b, 17a, 17b, 18a, 18b. Since the amount of current supplied to the motor is proportional to the load torque of the motor, the current sensor SA functions as torque detection means for indirectly detecting the load torque of the motor.

  The control device 30 includes a CPU (central processing unit) 31, a ROM 32, a RAM 33, an input device, and an input / output interface (none of which are shown). The control device 30 is electrically connected to the current sensor SA of each inverter 19a, 19b, 20a, 20b, 21a, 21b. CPU31 controls each drive motor 16a, 16b etc. via inverter 19a, 19b.

  Based on the output signal of each current sensor SA, the CPU 31 as the judging means, the deviation of the load torques of the front roller drive motors 16a, 16b, the difference of the load torques of the middle roller drive motors 17a, 17b, and the both backs. The deviation of the load torque of the roller drive motors 18a and 18b is obtained. Then, it is determined whether or not the deviation deviates from the set range, and when it deviates, it is determined as abnormal. Here, the “set range” means a value obtained by adding an allowable error to the variation amount of the load torque caused by the thickness variation of the raw material (coarse yarn). This set range is set to a common range without changing depending on the spinning count and fiber type.

  The CPU 31 also controls a motor (not shown) that drives the lifting drive system and the spindle drive system, and the control device 30 also functions as a control device for the spinning machine. When the CPU 31 determines that there is an abnormality, it performs control to stop the operation of the spinning machine.

  The ROM 32 stores program data and various data necessary for its execution. Program data includes various data such as spinning conditions such as various fiber materials, spinning yarn count and number of twists, spindle rotation speed during steady operation, rotation speed of draft drive system and lifting drive system motor, and various data There are maps that show the relationship between the number of rotations and the amount of supplied current. Further, the ROM 32 stores a range of supply current amount corresponding to a normal load torque. This value is used to determine which line shaft side is abnormal when the roller shaft 15 constituting the line shaft 12a or the like is loosened as an abnormality of the draft device 11. Is.

  The RAM 33 temporarily stores the data input by the input device, the calculation processing result in the CPU 31 and the like. The input device is used to input spinning condition data such as spinning yarn count, fiber type (raw material), maximum spindle rotation speed during spinning operation, spinning length, lift length, chase length, and used bobbin length.

  Next, the operation of the apparatus configured as described above will be described. Prior to the operation of the spinning machine, spinning conditions such as fiber raw material, spinning yarn count, and number of twists are input to the control device 30 by the input device. When the operation of the spinning machine is started, based on a command from the control device 30, each drive motor 16a, 16b, via the inverters 19a, 19b, 20a, 20b, 21a, 21b corresponding to the spinning conditions. The rotations 17a, 17b, 18a and 18b are controlled. In addition, the spindle drive system and the lifting system drive motor are also controlled to have a predetermined rotational speed.

  When the spinning machine is operated, the roving yarn passes through the back roller, the middle roller, and the front roller of the draft device 11 and is drafted, and then wound around a bobbin that rotates together with the spindle at a winding unit (not shown). Taken.

  The amount of current supplied to the drive motors 16a, 16b, etc. detected by the current sensors SA, such as the inverters 19a, 19b, is input to the control device 30. The CPU 31 has two drive motors for driving the same draft roller, that is, the first and second front roller drive motors 16a and 16b, the first and second middle roller drive motors 17a and 17b, and the first and second drive motors. It is determined whether or not the deviation of the amount of current supplied to the second back roller drive motors 18a and 18b has deviated from the set range. And when it deviates, it judges that it is abnormal and outputs an abnormal signal. Based on this abnormal signal, the operation stop control of the machine base is carried out, and notifying means such as a buzzer and an alarm lamp are driven to notify the operator of an alarm.

  The amount of current supplied to the drive motors 16a, 16b, 17a, 17b, 18a, 18b is proportional to the magnitude of the load torque. Further, the load torque of each draft roller is substantially constant within a range corresponding to the thickness unevenness of the roving yarn unless the spinning raw material and the draft rate are changed. In the draft device 11, the front bottom roller 12, the middle bottom roller 13, and the back bottom roller 14 are divided into two at the center in the longitudinal direction, and are driven by two drive motors, respectively. Therefore, if there is no abnormality in spinning, the load torques of the two motors for driving the bottom rollers 12 to 14, for example, the first front roller drive motor 16a and the second front roller drive motor 16b, respectively. The deviation is small and falls within a set range, and the deviation of the amount of current supplied to both drive motors 16a and 16b also falls within the set range. However, if the load torque for driving the draft roller increases due to abnormalities such as wrapping of the coarse yarn around the draft roller or biting of the apron, the load torque of the drive motor also increases and the deviation is set. Depart from the stated range. If the abnormality occurs simultaneously at a symmetrical position with respect to the longitudinal center of the draft roller, the abnormality cannot be detected depending on the deviation in the amount of current supplied to the two drive motors 16a, 16b, etc. Is very small. Therefore, even if each drive motor 16a, 16b, 17a, 17b, 18a, 18b is not overloaded, it can be detected that the load on the draft roller is abnormal.

This embodiment has the following effects.
(1) The torque detection means detects the load torque of two motors among a plurality of motors (drive motors 16a, 16b, etc.) that drive the draft rollers (front bottom roller 12, middle bottom roller 13, back bottom roller 14). And determining means (CPU 31) for determining an abnormality when the deviation between the load torques of the two motors deviates from the set range. Therefore, it is possible to determine whether or not there is an abnormality by comparing the common reference range with the detected deviation of the load torque without setting a reference value for determining whether or not the spinning state is abnormal for each spinning condition. Is made accurately. As a result, it is possible to detect the occurrence of an abnormality in the draft device 11 at the time of spinning with a simple configuration without storing a strict reference value.

  (2) The two motors are motors (drive motors 16a, 16b, etc.) that drive draft rollers (front bottom roller 12 etc.) driven from both sides. Therefore, it is possible to detect the occurrence of an abnormality in the draft device 11 at the time of spinning with a simple configuration without storing a strict reference value.

  (3) The draft roller (front bottom roller 12 or the like) is divided into two at the center in the longitudinal direction. Therefore, based on whether the detected deviation of the load torque is negative (minus) or positive (plus), it can be estimated which side of the line shaft (line shafts 12a, 12b, etc.) is abnormal. . In general, when an abnormality occurs, torque for driving the line shaft on the abnormality occurrence side increases. However, in this embodiment, the line shafts 12a, 12b and the like are driven from one end side and the other end side is a free end, so that the threaded portion of the roller shaft 15 constituting the line shafts 12a, 12b and the like is loosened. There is a case. In that case, since the load torque of the drive motor for the line shaft in which the slack has occurred decreases, it is erroneous to determine that an abnormality has occurred when the load torque is relatively large. However, in this embodiment, the range of the supply current corresponding to the normal load torque is stored. Therefore, when determining whether or not there is an abnormality, the CPU 31 also determines whether or not the load torque is smaller than the normal value from the output signals of the current sensors SA such as the inverters 19a and 19b. Based on this, it is possible to correctly determine which line shaft side is abnormal. It is also possible to determine whether the abnormality is an abnormality that increases or decreases the load torque.

  (4) Since two drive motors are provided for each front bottom roller 12, middle bottom roller 13, and back bottom roller 14, it is possible to detect which bottom roller has an abnormality and Makes it easier to find abnormal parts.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. In this embodiment, all the bottom rollers 12 to 14 are constituted by one line shaft 12c, 13c, 14c, and each front bottom roller 12, middle bottom roller 13 and back bottom roller 14 are provided with two motors from both sides. The point driven by is different from the first embodiment. About the same part as 1st Embodiment, the same code | symbol is attached | subjected, detailed description is abbreviate | omitted, and a different part is demonstrated.

  The bottom rollers 12 to 14 constituting the draft device 11 are installed between the gear boxes 22 and 23 in parallel with each other. In one gear box 22, a gear train (not shown) that transmits the rotation of the drive shaft 26 to which the rotation of the first drive motor 24 a is transmitted via the belt transmission mechanism 25 to the left and right bottom rollers 12 to 14. (Drive gearing) is built-in. Also, the rotation of the drive shaft 26, in which the rotation of the second drive motor 24 b is transmitted through the belt transmission mechanism 25, is transmitted to the left and right bottom rollers 12 to 14 in the other gear box 23 as well. A gear train (drive gearing) that does not work is built in.

  The first and second drive motors 24a and 24b are connected to the inverters 27a and 27b, and are controlled by the control device 30 through the inverters 27a and 27b. The inverters 27a and 27b input a direct current obtained by converting a commercial power source using an AC / DC converter (both not shown), and rotate the drive motors 24a and 24b at a predetermined rotational speed, thereby driving a current corresponding to the load. The motors 24a and 24b are supplied. The inverters 27a and 27b are equipped with a current sensor SA as torque detecting means for detecting the amount of current supplied to the drive motors 24a and 24b.

  In this embodiment, during operation of the draft device 11, the load torque acting on the two drive motors 24a and 24b is indirectly detected by the current sensor SA. In the configuration in which the front bottom roller 12, the middle bottom roller 13, and the back bottom roller 14 are driven from both sides of the machine base, the drive motors 24a and 24b are provided as long as there is no abnormality such as fiber winding in the draft device 11. The acting load is equivalent, and the deviation of the load torque falls within the set range. When an abnormality such as fiber winding occurs on the draft roller, the value of the load torque acting on the first and second drive motors 24a and 24b varies depending on the difference in distance from the abnormality occurrence point to the end of the draft roller. It becomes a state.

  The CPU 31 constantly monitors whether or not the load torque deviation has deviated from the set range based on the output signals of the current sensors SA of both inverters 27a and 27b. And when it deviates, it judges that it is abnormal and outputs an abnormal signal. Based on this abnormal signal, the operation stop control of the machine base is performed, and the notification means is driven to notify the worker of an alarm.

In this embodiment, in addition to the same effects as the effects (1) and (2) of the first embodiment, the following effects can be obtained.
(5) Since all the bottom rollers 12, 13, and 14 are driven by the two drive motors 24a and 24b, the structure is simplified as compared to the first embodiment.

  (6) Since each of the bottom rollers 12, 13, and 14 is composed of one line shaft 12c, 13c, and 14c and is driven from both sides, the roller shaft 15 that constitutes the line shaft does not loosen. Therefore, it is not necessary to store the range of the supply current amount corresponding to the normal load torque, and it is possible to exclude the case where the roller shaft 15 constituting the line shaft 12a and the like is loosened as an abnormality of the draft device 11. .

The embodiment is not limited to the above, and may be embodied as follows, for example.
In the first embodiment, the range of the supply current amount corresponding to the normal load torque may not be stored, and the determination of whether or not the load torque is smaller than the normal value may be omitted. Even in this case, the occurrence of abnormality can be detected correctly.

  ○ When the draft roller is divided into two in the longitudinal direction, the dividing position is not necessarily limited to the center. In the case of a configuration that is divided into two at positions shifted from the center, the load motor proportional to the length of each line shaft and the number of weights acts on the two motors that drive the draft roller. There is a deviation in the load torque. Therefore, by setting the allowable deviation amount from the deviation within the set range, it is possible to determine whether or not there is an abnormality as in the first embodiment.

  As a current amount detection means for detecting the amount of current supplied to the drive motors 16a, 16b, etc., a sensor that detects a voltage corresponding to the current amount may be used instead of the current sensor SA that directly detects the current amount. Good.

  〇 As torque detection means for detecting the load torque acting on the drive motors 16a, 16b, etc., instead of the configuration for detecting the amount of current supplied to the drive motors 16a, 16b, etc., from the output shaft of the drive motors 16a, 16b, etc. You may provide the torque detection means which detects the change of the torque in the rotation part between the drive motor side ends of a draft roller. For example, a torque converter is used as the torque detection means. The torque converter converts torque into an electrical signal (eg, voltage). Moreover, it is good also as a structure which affixes a distortion gauge to the edge part by the side of the drive motor 16a, 16b of a draft roller, and detects the load torque of a draft roller. In these configurations, the load torque can be directly detected. And since the detection location is the rotation part from the drive motor side edge part of a draft roller to the output shaft of a drive motor, the load of a draft roller can be detected reliably.

The judgment means for monitoring the deviation of the load torque acting on the drive motors 16a, 16b, etc. and judging that the deviation of the load torque deviates from the set range is not limited to the configuration using the CPU 31. For example, a comparator may be used to determine whether or not the deviation of the load torque acting on the drive motors 16a and 16b has deviated from the set range. Further, the presence or absence of an abnormality may be determined by comparing the deviation of the voltage value or current value, which is an output signal of the torque converter, with a reference value using a comparator.

  ◯ Not limited to the configuration in which the set range used for comparison with the deviation of the load torque acting on the drive motors 16a, 16b, etc. is stored in advance in the ROM 32 of the control device 30 as data, but is stored in the RAM 33 by the input device. You may let them.

  ○ Not only the configuration in which each of the bottom rollers 12 to 14 is driven by the drive motors 16a and 16b from both sides of the machine base, but some bottom rollers (for example, the middle bottom roller 13) are driven from both sides of the machine base and others The bottom roller may be driven from one side of the machine base.

  ○ Instead of driving the same draft roller with two motors, it is configured to drive different draft rollers with different motors to determine whether the load torque deviation of each motor deviates from the set range. And it is good also as a structure which detects abnormality. For example, the front bottom roller 12 is driven by a single drive motor, the middle bottom roller 13 and the back bottom roller 14 are driven by a single drive motor, and the range in which the deviation of the load torque of both drive motors is set It is good also as a structure which judges that it is abnormal when it deviates from.

  ○ When the abnormality detection signal is output from the abnormality detection device, instead of the configuration in which the operation of the spinning machine is immediately stopped by the control device 30, the control of stopping the spinning operation when the abnormality detection signal is continued for a predetermined time is performed. You may make it perform. In this case, it is not necessary to stop and restart the machine base when the load torque abnormality is transient.

The draft device 11 is not limited to a three-wire type, and may be a device having four or more draft rollers on one side.
A servo motor may be used instead of a motor controlled via an inverter as a motor for driving the draft roller.

  ○ Not only for ring spinning machines, but also for other spinning machines equipped with a drafting device, such as ring spinning machines for drafting sliver directly without spinning and spinning spun yarns, and binding spinning machines or roving machines. May be.

The technical idea (invention) that can be grasped from the respective embodiments will be described below.
(1) In the invention described in claim 1, the spinning machine is a spinning machine, and the plurality of motors are a motor for driving a front roller and a motor for driving another draft roller.

(2) In the invention described in claim 2, the draft roller is divided at the center.
(3) In the invention according to any one of claim 3 and the technical idea (2), the determination means is configured to detect when the detected load torque is smaller than the normal load torque of the motor by a predetermined amount or more. Then, it is determined that an abnormality has occurred on the side of the draft roller that is driven by the motor with the detected small load torque.

  (4) In the invention according to any one of claims 1 to 3 and the technical ideas (1) to (3), the torque detection means is configured to supply the load torque to the motor. Detect with.

The schematic plan view of the draft apparatus which abbreviate | omitted the top roller of 1st Embodiment. The partially broken partial top view which shows the connection state of a roller shaft. The schematic plan view of the draft apparatus which abbreviate | omitted the top roller of 2nd Embodiment.

Explanation of symbols

  SA: current sensor as torque detecting means, 11: draft device, 12: front bottom roller as draft roller, 13: middle bottom roller, 14: back bottom roller, 16a: first front roller as motor Drive motor, 16b ... same second front roller drive motor, 17a ... same first middle roller drive motor, 17b ... same second middle roller drive motor, 18a ... same first back roller drive motor , 18b ... second back roller drive motor, 24a ... first drive motor, 24b ... second drive motor, 31 ... CPU as determination means.

Claims (4)

  An apparatus for detecting an abnormality of a draft device in a spinning machine that drives a draft roller by a plurality of motors, wherein torque detecting means for detecting a load torque of at least two motors of the plurality of motors; An abnormality detection device for a draft device in a spinning machine, comprising: determination means for determining an abnormality when a deviation in load torque deviates from a set range.   2. The abnormality detection device for a draft device in a spinning machine according to claim 1, wherein the spinning machine is a spinning machine having draft rollers driven from both sides, and the two motors are motors for driving the draft rollers.   The abnormality detection device for a draft device in a spinning machine according to claim 2, wherein the draft roller is divided into two in the longitudinal direction.   The said determination means estimates the draft roller which has generate | occur | produced abnormality based on the deviation of the load torque of the said 2 motors, and the deviation with respect to the normal load torque of the load torque of each motor. Abnormality detection device of draft device in the spinning machine.

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