JP2019007104A - Draft device, draft system, spinning system and spinning machine - Google Patents

Abstract

To suitably control the output torques of motors in accordance with the fiber bundle to be used.SOLUTION: Provided is a draft system comprising: a pair of rollers 14 and 15; driving motors M14 and M15 rotating the pair of rollers 14 and 15, respectively; a rotary encoder R14a or the like detecting the rotary speed of a plurality of rollers in the pair of rollers 14 and 15; and a representative unit control apparatus 10A setting target output torque values to each of the driving motors M14 and M15 and controlling the output torques of the plurality of driving motors M14 and M15, respectively, based on the set target output torque values. The representative unit control apparatus 10A increases the target output torque value of the driving motor M14 or the M15 rotating the pair of rollers 14 or 15 reduced in rotary speed by the pre-determined first torque value when the rotary speed of each roller varies by a pre-determined determination value or more in a speed reduction direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a draft device, a draft system, a spinning system, and a spinning machine.

  For example, Patent Document 1 discloses a draft device including a plurality of draft rollers for drafting fiber bundles. The draft roller of such a draft device is driven by a motor. The output torque of the motor is controlled so that the fiber bundle can be stably stretched by the draft roller.

JP, 2015-101797, A

  The draft device drafts various types of fiber bundles. The output torque of the motor necessary for drafting the fiber bundle varies depending on the fiber bundle to be drafted. When the output torque of the motor is lower than the torque required for drafting the fiber bundle, the rotational speed of the draft roller decreases due to the lack of torque. If the rotational speed of the draft roller is reduced, draft drafts may be uneven in the drafted fiber bundle, and the quality of yarn produced using this fiber bundle may be reduced. On the other hand, if the output torque of the motor is too higher than the required torque, energy is wasted.

  Therefore, an object of the present invention is to provide a draft device, a draft system, a spinning system, and a spinning machine that can appropriately control the output torque of a motor in accordance with a fiber bundle to be used.

  The draft system according to the present invention includes a driving roller and a driven roller that rotates as the driving roller rotates, and a plurality of pairs of rollers that draft a fiber bundle and a plurality of motors that respectively rotate the plurality of driving rollers. A target output torque value for each of a plurality of motors and one or a plurality of rotation detection units that detect at least one of a plurality of driving rollers and a plurality of driven rollers, and a set target A motor control unit that controls the output torque of each of the plurality of motors based on the output torque value, and the motor control unit has a rotation speed detected by the rotation detection unit equal to or greater than a predetermined determination value in the speed decreasing direction. If it fluctuates, the target output torque value of the motor that rotates the roller pair having the driving roller or the driven roller whose rotational speed fluctuated more than the judgment value is predicted. Increase the first torque value stipulated.

  In this draft system, when the rotational speed of the driving roller or the driven roller is reduced, the motor control unit calculates the target output torque value of the motor that rotates the roller pair having the driving roller or the driven roller having the reduced rotational speed as the first torque. Increase the value. Thus, the draft system can stably draft the fiber bundle by suppressing the decrease in the rotational speed of the driving roller and the driven roller due to the shortage of the output torque of the motor. Further, by setting the amount of increase to the first torque value, it is possible to slightly increase the target output torque value, preventing the target output torque value from exceeding the required torque, and wasting energy. Can avoid unnecessary consumption. As described above, the draft system can appropriately control the output torque of the motor according to the fiber bundle used.

  The motor control unit rotates a roller pair other than a roller pair having a driving roller or a driven roller whose rotation speed fluctuates more than a determination value when the rotation speed detected by the rotation detection unit fluctuates more than the determination value in the speed decreasing direction. The target output torque value of the motor may be increased by a predetermined second torque value. In this case, the draft system can increase the target output torque value even for a motor that rotates a roller pair other than a roller pair having a driving roller or a driven roller whose rotational speed is reduced. Thereby, the draft system can raise the output torque of the motor of a some roller pair with the fall of the rotational speed of a drive motor or a driven roller. Further, by setting the amount of increase to the second torque value, it is possible to slightly increase the target output torque value and avoid unnecessary energy consumption.

  If the motor control unit does not detect that the rotation speed detected by the rotation detection unit fluctuates more than the determination value in the direction of decreasing speed for a predetermined time or more, the motor control unit calculates at least one target output torque value of the plurality of motors. Alternatively, a predetermined third torque value may be decreased. Here, when the rotational speed of the driving roller and the driven roller does not decrease, it is conceivable that the output torque of the motor is sufficiently larger than the required torque. For this reason, the draft system reduces the output torque of the motor when a decrease in the rotational speed of the drive motor or the driven roller is not detected for a predetermined time. Thereby, the draft system can appropriately control the output torque of the motor.

  A spinning system according to the present invention includes the draft system described above, an air spinning device that twists the fiber bundle drafted by the draft system to generate yarn, and a package that winds the yarn generated by the air spinning device. A winding device to be formed. Thus, even in a spinning system including a draft system, an air spinning machine, and a winding device, the output torque of the draft system motor can be appropriately controlled according to the fiber bundle used. Since the draft unevenness of the fiber bundle in the draft system is suppressed, the spinning system can suppress the deterioration of the yarn quality.

  A spinning machine according to the present invention includes a plurality of the above spinning systems, wherein at least one of the plurality of driving rollers is independently rotated for each driving roller, and the rotation detecting unit is a driving roller that is independently rotated. , And at least one of the rotational speeds of the driven roller that rotates as the driving roller rotates. Thus, the output torque of the motor of the driving roller that is rotated independently for each driving roller can be appropriately controlled according to the fiber bundle to be used. Here, the drive rollers driven independently have individual variations compared to the drive rollers driven at the same time, and the content and timing of the change in rotational speed may be different for each drive roller driven independently. By controlling such a single drive roller as a target, the spinning system can be controlled efficiently.

  A spinning machine according to the present invention includes a first spinning unit, a first unit control device that controls the first spinning unit, a second spinning unit, and a second unit control device that controls the second spinning unit. The first spinning unit includes a first draft device that drafts a fiber bundle, a first pneumatic spinning device that generates a yarn by twisting the fiber bundle drafted by the first draft device, A first winding device that winds the yarn generated by the single air spinning device to form a package, and the first draft device rotates in accordance with the rotation of the first driving roller and the first driving roller. Each of the first driving rollers is provided for at least one of a plurality of first roller pairs and a plurality of first driving rollers each having one driven roller and drafting the fiber bundle, and the first driving roller is independently provided for the first driving roller. Drive roller Detecting the rotational speed of at least one of one or a plurality of first motors to be rotated, a first driving roller that is rotated independently, and a first driven roller that rotates as the first driving roller rotates. One or a plurality of rotation detectors, and the first unit controller sets a target output torque value for each of the one or more first motors, and sets the target output torque value based on the set target output torque value. A first drive roller that controls the output torque of each of the plurality of first motors, and when the rotation speed detected by the rotation detector fluctuates more than a predetermined determination value in the speed decreasing direction, the rotation speed fluctuates more than the determination value. Alternatively, the target output torque value of the first motor for rotating the first roller pair having the first driven roller is increased by a predetermined first torque value, and the second spinning unit drafts the fiber bundle. A second drafting device, a second air spinning device for producing a yarn by twisting the fiber bundle drafted by the second drafting device, and winding the yarn produced by the second air spinning device to form a package A second winding device, each of which has a second driving roller and a second driven roller that rotates with the rotation of the second driving roller, and drafts the fiber bundle. Two roller pairs, and one or a plurality of second motors that are provided for at least one of the plurality of second driving rollers and rotate the second driving roller independently for each second driving roller, The number of first roller pairs and the number of second roller pairs are the same, the number of first motors and the number of second motors are the same, and the second motor is a draft. In the moving direction of the fiber bundle at the time, the first mode The second roller pair provided at the same position as the first roller pair to be rotated by the motor rotates, and the second unit controller sets a target output torque value for each of the one or more second motors. Then, the output torque of one or a plurality of second motors is controlled based on the set target output torque value, and the target output torque value is set as a target output torque value set for each of the one or more second motors. A target output torque value set for the first motor that rotates the first roller pair provided at the same position as the second roller pair that is rotated by the target second motor is set.

  The first unit control device rotates a first roller pair having a first driving roller or a first driven roller having a reduced rotational speed when the rotational speed of the first driving roller or the first driven roller is reduced. The target output torque value of the motor is increased by the first torque value. Thereby, the 1st draft device can draft the fiber bundle stably by suppressing the fall of the rotation speed of the 1st drive roller and the 1st driven roller by lack of the output torque of the 1st motor. As described above, the spinning machine can appropriately control the output torque of the first motor in accordance with the fiber bundle used. The number of first roller pairs in the first draft device is the same as the number of second roller pairs in the second draft device. For this reason, it is conceivable that the fluctuations in the rotational speed generated in the first roller pair provided in the first draft device also occur in the same manner on the second draft device side. Therefore, the second unit control device sets the target output torque value set for the first motor as the target output torque value for the second motor. Thus, the second draft device can stably draft the fiber bundle by suppressing a decrease in the rotation speed of the second drive roller and the second driven roller due to the shortage of the output torque of the second motor. As described above, the spinning machine can appropriately control the output torque of the second motor in accordance with the fiber bundle used. Since the unevenness of the draft of the fiber bundle is suppressed in the first draft device and the second draft device, the spinning machine can suppress the deterioration of the yarn quality. Moreover, the rotation detection part should just be provided only in the 1st spinning unit. For this reason, in the 2nd spinning unit, installation of a rotation detection part becomes unnecessary.

  A plurality of first motors and a plurality of second motors are provided, and the first unit controller, when the rotation speed detected by the rotation detector fluctuates more than the determination value in the speed decreasing direction, the rotation speed fluctuates more than the determination value. The target output torque value of the first motor that rotates the first roller pair other than the first roller pair having the first drive roller or the first driven roller may be increased by a predetermined second torque value. In this case, the first unit control device also sets the target output torque value for the first motor that rotates the first roller pair other than the first roller pair having the first driving roller or the first driven roller whose rotational speed has decreased. Can be raised. Accordingly, the spinning machine can increase the output torque of the first motors of the plurality of first roller pairs as the rotational speed of the first driving roller or the first driven roller decreases. The second unit control device sets the target output torque value set in the first motor as the target output torque value of the second motor. For this reason, the 2nd unit control device can raise the target output torque value of the 2nd motor like control of the 1st motor by the 1st unit control device. As a result, the spinning machine can increase the output torque of the second motors of the plurality of second roller pairs.

  If the rotation speed detected by the rotation detector does not change more than a predetermined value in the direction of decreasing speed, if the first unit control device does not detect more than a predetermined time, at least one of the one or more first motors The output torque may be reduced by a predetermined third torque value. Here, when the rotational speeds of the first driving roller and the first driven roller do not decrease, it is conceivable that the output torque of the first motor is sufficiently larger than the required torque. For this reason, the first unit controller reduces the output torque of the first motor when a decrease in the rotation speed of the first drive roller or the first driven roller is not detected for a predetermined time or more. Thereby, the spinning machine can appropriately control the output torque of the first motor. The second unit control device sets the target output torque value set in the first motor as the target output torque value of the second motor. For this reason, the 2nd unit control device can reduce the output torque of the 2nd motor like control of the 1st motor by the 1st unit control device. Thereby, the spinning machine can appropriately control the output torque of the second motor.

  A spinning machine according to the present invention is a spinning machine including a first spinning unit, a second spinning unit, and a unit controller that controls the first spinning unit and the second spinning unit, respectively. The first draft device for drafting the fiber bundle, the first air spinning device for producing a yarn by twisting the fiber bundle drafted by the first draft device, and the yarn produced by the first air spinning device A first winding device that winds to form a package, and each of the first draft devices has a first driving roller and a first driven roller that rotates as the first driving roller rotates, and a fiber One or a plurality of first roller pairs provided for at least one of the plurality of first roller pairs for drafting the bundle and the plurality of first driving rollers, each rotating the first driving roller independently for each first driving roller. 1 One or a plurality of rotation detectors that detect at least one of the rotation speed of the first driven roller that rotates independently of the data and the first driven roller that rotates as the first drive roller rotates. A second spinning unit for drafting the fiber bundle, a second pneumatic spinning device for generating a yarn by twisting the fiber bundle drafted by the second draft device, and a second A second winding device that winds the yarn generated by the pneumatic spinning device to form a package, and the second draft device rotates in accordance with the rotation of the second driving roller and the second driving roller. Each of the second driving rollers each having a driven roller and provided for at least one of the plurality of second roller pairs for drafting the fiber bundle and the plurality of second driving rollers is independent of the second driving roller. Rotating roller One or a plurality of second motors, and the number of the plurality of first roller pairs and the number of the plurality of second roller pairs are the same as each other, and the number of the first motors and the number of the second motors Are the same as each other, and the second motor rotates the second roller pair provided at the same alignment position as the first roller pair rotated by the first motor in the moving direction of the fiber bundle at the time of drafting, and performs unit control. The apparatus sets a target output torque value for each of the one or more first motors and the one or more second motors, and based on the set target output torque values, the one or more first motors and one or more The first drive roller that controls the output torque of each of the plurality of second motors, and when the rotation speed detected by the rotation detector fluctuates more than a predetermined determination value in the speed decreasing direction, the rotation speed fluctuates more than the determination value. Or the first driven roller The target output torque value of the first motor that rotates the first roller pair having the above is increased by a predetermined first torque value, and the target output torque value set for each of the one or more second motors is used as the target output torque value. A target output torque value set for the first motor that rotates the first roller pair provided at the same position as the second roller pair that is rotated by the second motor to be set by the torque value is set.

  The unit control device includes: a first motor that rotates a first roller pair having a first driving roller or a first driven roller having a reduced rotational speed when the rotational speed of the first driving roller or the first driven roller is reduced; The target output torque value is increased by the first torque value. Thereby, the 1st draft device can draft the fiber bundle stably by suppressing the fall of the rotation speed of the 1st drive roller and the 1st driven roller by lack of the output torque of the 1st motor. As described above, the spinning machine can appropriately control the output torque of the first motor in accordance with the fiber bundle used. The number of first roller pairs in the first draft device is the same as the number of second roller pairs in the second draft device. For this reason, it is conceivable that the fluctuations in the rotational speed generated in the first roller pair provided in the first draft device also occur in the same manner on the second draft device side. For this reason, the unit control device sets the target output torque value set in the first motor as the target output torque value of the second motor. Thus, the second draft device can stably draft the fiber bundle by suppressing a decrease in the rotation speed of the second drive roller and the second driven roller due to the shortage of the output torque of the second motor. As described above, the spinning machine can appropriately control the output torque of the second motor in accordance with the fiber bundle used. Since the unevenness of the draft of the fiber bundle is suppressed in the first draft device and the second draft device, the spinning machine can suppress the deterioration of the yarn quality. Moreover, the rotation detection part should just be provided only in the 1st spinning unit. For this reason, in the 2nd spinning unit, installation of a rotation detection part becomes unnecessary.

  A plurality of first motors and a plurality of second motors are provided, and the unit control device is configured such that when the rotation speed detected by the rotation detection unit fluctuates more than a determination value in the speed decreasing direction, the rotation speed fluctuates more than the determination value. The target output torque value of the first motor that rotates the first roller pair other than the first roller pair having the driving roller or the first driven roller may be increased by a predetermined second torque value. In this case, the unit control device also increases the target output torque value for the first motor that rotates the first roller pair other than the first roller pair having the first drive roller or the first driven roller whose rotational speed has decreased. be able to. Accordingly, the spinning machine can increase the output torque of the first motors of the plurality of first roller pairs as the rotational speed of the first driving roller or the first driven roller decreases. Further, the unit control device sets the target output torque value set in the first motor as the target output torque value of the second motor. For this reason, the unit control device can increase the target output torque value of the second motor in the same manner as the control of the first motor. As a result, the spinning machine can increase the output torque of the second motors of the plurality of second roller pairs.

  The unit control device outputs the output of at least one of the first motor or the plurality of first motors when the rotation speed detected by the rotation detection unit does not detect that the rotation speed fluctuates more than the determination value in the direction of decreasing the speed for a predetermined time. The torque may be decreased by a predetermined third torque value. Here, when the rotational speeds of the first driving roller and the first driven roller do not decrease, it is conceivable that the output torque of the first motor is sufficiently larger than the required torque. For this reason, the unit control device reduces the output torque of the first motor when a decrease in the rotation speed of the first drive roller or the first driven roller is not detected for a predetermined time or more. Thereby, the spinning machine can appropriately control the output torque of the first motor. Further, the unit control device sets the target output torque value set in the first motor as the target output torque value of the second motor. For this reason, the unit control device can reduce the output torque of the second motor in the same manner as the control of the first motor. Thereby, the spinning machine can appropriately control the output torque of the second motor.

  In the present invention, the draft device includes a driving roller and a driven roller that rotates as the driving roller rotates, a plurality of roller pairs that draft the fiber bundle, and a plurality of motors that rotate the plurality of driving rollers, respectively. A rotation detecting unit that detects a rotation speed of a driven roller included in a roller pair positioned second from the upstream side in the moving direction of the fiber bundle during drafting by the roller pair among the plurality of roller pairs. In this draft device, the rotation detection unit detects the rotation speed of the driven roller of the roller pair located second from the upstream side in the moving direction of the fiber bundle among the plurality of roller pairs. Here, among the plurality of roller pairs, the most upstream roller pair only draws the fiber bundle conveyed toward the draft device, and the load is small. In the second and subsequent roller pairs from the upstream side, the fiber bundles are gradually drafted and become thinner, so that the load decreases in order toward the downstream side. For this reason, a large load is applied to the second roller pair from the upstream side in the moving direction of the fiber bundle. Therefore, among the plurality of roller pairs, the rotation speed of the second roller pair from the upstream side in the moving direction of the fiber bundle is likely to change. In addition, when the output torque of the motor is insufficient, the rotational speed of the driven roller in the second roller pair from the upstream side often decreases. For this reason, by detecting the rotational speed of the driven roller of the roller pair positioned second from the upstream side, the draft device can preferably detect the shortage of the output torque of the motor. By using the detection result of the rotation detection unit, it is possible to appropriately control the output torque of the motor according to the fiber bundle used.

  According to the present invention, the output torque of the motor can be appropriately controlled according to the fiber bundle used.

It is a front view of the spinning machine of one embodiment of the present invention. FIG. 2 is a side view of the representative draft device shown in FIG. 1. FIG. 3A is a diagram showing the rotation speed of each roller provided in the representative drafting device. FIG. 3B is a diagram illustrating a state in which the rotation speed of each roller provided in the representative drafting device varies. It is a side view of the general draft device shown in FIG. It is the schematic which shows the spinning unit which a unit control apparatus controls.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same or an equivalent part, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 1, the spinning machine 1 includes a plurality of spinning units 2, a yarn splicing cart 3, a doffing cart (not shown), a first end frame 4, and a second end frame 5. I have. The plurality of spinning units 2 are arranged in a line. Each spinning unit 2 generates the yarn Y and winds it on the package P. When the yarn Y is cut by a certain spinning unit 2 or the yarn Y is cut for some reason, the yarn joining cart 3 performs a yarn joining operation with the spinning unit 2. The doffing cart doffs the package P and supplies a new bobbin B to the spinning unit 2 when the package P is full in a spinning unit 2.

  The first end frame 4 accommodates a collection device for collecting fiber waste and yarn waste generated in the spinning unit 2. The second end frame 5 is configured to adjust the air pressure of the compressed air (air) supplied to the spinning machine 1 to supply air to each part of the spinning machine 1 and to supply power to each part of the spinning unit 2. A drive motor or the like is stored. The second end frame 5 is provided with a machine control device 5a, a display screen 5b, and an input key 5c. The machine control device 5a centrally manages and controls each part of the spinning machine 1. The display screen 5b can display information related to the setting contents and / or status of the spinning unit 2. When the operator performs an appropriate operation using the input key 5c, the setting operation of the spinning unit 2 can be performed. The display screen 5b may be configured by a touch panel so that display and setting work can be performed on the touch panel.

  Each spinning unit 2 includes, in order from the upstream side in the traveling direction of the yarn Y, a draft device 6, an air spinning device 7, a yarn monitoring device 8, a tension sensor 9, a yarn storage device 11, a waxing device 12, A winding device 13. The unit control device 10 is provided for each predetermined number of spinning units 2 and controls the operation of the spinning units 2.

  The draft device 6 drafts a sliver (fiber bundle) S. The draft device 6 includes a back roller pair 14, a third roller pair 15, a middle roller pair 16, and a front roller pair 17 in order from the upstream side in the traveling direction (movement direction) of the sliver S. Each roller pair 14, 15, 16 and 17 has bottom rollers 14a, 15a, 16a and 17a and top rollers 14b, 15b, 16b and 17b, respectively. The bottom rollers 14a, 15a, 16a, and 17a are rotationally driven by a drive motor provided in the second end frame 5 and drive motors M14 and M15 provided in each spinning unit 2, respectively. For the bottom roller 16a of the middle roller pair 16, an apron belt (the apron belt 18a in FIGS. 2 and 4) is provided. For the top roller 16b of the middle roller pair 16, an apron belt (the apron belt 18b in FIGS. 2 and 4) is provided.

  The air spinning device 7 generates a yarn Y by twisting the fiber bundle F drafted by the draft device 6 by a swirling air flow. The yarn accumulating device 11 takes the slack of the yarn Y between the pneumatic spinning device 7 and the winding device 13. The waxing device 12 applies wax to the yarn Y between the yarn storage device 11 and the winding device 13. The winding device 13 forms the package P by winding the yarn Y around the bobbin B.

  The yarn monitoring device 8 monitors the state of the traveling yarn Y between the pneumatic spinning device 7 and the yarn storage device 11, and detects the presence or absence of a yarn defect based on the monitored state of the yarn Y. When the yarn monitoring device 8 detects a yarn defect, the yarn monitoring device 8 transmits a yarn defect detection signal to the unit control device 10. The tension sensor 9 measures the tension of the traveling yarn Y between the pneumatic spinning device 7 and the yarn storage device 11, and transmits a tension measurement signal to the unit control device 10. When the unit control device 10 determines that there is an abnormality based on the detection result of the yarn monitoring device 8 and / or the tension sensor 9, the yarn Y is cut by interrupting the generation of the yarn Y by the pneumatic spinning device 7. A cutter may be provided in the spinning unit 2, and the yarn Y may be cut by the cutter.

  Here, the plurality of spinning units 2 include spinning units 2 that are partially different in configuration from others. Hereinafter, among the plurality of spinning units 2, a spinning unit 2 having a partially different structure from the others is referred to as a representative spinning unit (first spinning unit) 2A, and spinning units 2 other than the representative spinning unit 2A are set as general spinning units (second spinning units). Spinning unit) 2B. One representative spinning unit 2A is provided for each predetermined number of general spinning units 2B. In FIG. 1, the spinning unit 2 closest to the second end frame 5 among the plurality of spinning units 2 is shown as the representative spinning unit 2A, but the positions and the number of the representative spinning units 2A are shown in FIG. It is not limited to examples.

  Further, the representative spinning unit 2A and the general spinning unit 2B have different configurations of the draft device 6. The representative spinning unit 2A and the general spinning unit 2B have the same configuration except for the draft device 6. Hereinafter, for convenience of explanation, the draft device 6 included in the representative spinning unit 2A is referred to as a representative draft device 6A, and the draft device 6 included in the general spinning unit 2B is referred to as a general draft device 6B.

  That is, the representative spinning unit 2A includes, in order from the upstream side in the traveling direction of the yarn Y, a representative draft device (first draft device) 6A, an air spinning device (first air spinning device) 7, a yarn monitoring device 8, A tension sensor 9, a yarn accumulating device 11, a waxing device 12, and a winding device (first winding device) 13 are provided. Similarly, the general spinning unit 2B includes a general draft device (second draft device) 6B, an air spinning device (second air spinning device) 7, and a yarn monitoring device 8 in order from the upstream side in the traveling direction of the yarn Y. The tension sensor 9, the yarn accumulating device 11, the waxing device 12, and the winding device (second winding device) 13 are provided.

  First, the representative drafting device 6A provided in the representative spinning unit 2A will be described. As shown in FIG. 2, the back roller pair (roller pair, first roller pair) 14 is a back bottom roller (drive roller, first drive roller) 14a facing each other across a travel route R for running the sliver S. And a back top roller (driven roller, first driven roller) 14b. The third roller pair (first roller pair) 15 includes a third bottom roller (first driving roller) 15a and a third top roller (first driven roller) 15b that are opposed to each other with the travel route R interposed therebetween. The middle roller pair 16 includes a middle bottom roller 16a and a middle top roller 16b that face each other across the travel route R. The front roller pair 17 includes a front bottom roller 17a and a front top roller 17b that face each other across the travel route R. The plurality of roller pairs 14, 15, 16 and 17 feed the sliver S supplied from a can (not shown) and guided by the fiber bundle guide 77 from the upstream side to the downstream side while drafting.

  The back bottom roller 14 a is rotatably supported by the back roller housing 66. The third bottom roller 15 a is rotatably supported by the third roller housing 67. The middle bottom roller 16a is rotatably supported by the middle roller housing 68. The front bottom roller 17a is rotatably supported by the front roller housing 69. In addition, the structure which supports each bottom roller 14a, 15a, 16a, and 17a is not limited to this. For example, the middle bottom roller 16a and the front bottom roller 17a may be rotatably supported by a common housing.

  Here, the representative draft device 6A further includes a drive motor (motor, first motor) M14 and a drive motor (motor, first motor) M15. The drive motor M14 rotates the back bottom roller 14a. In the present embodiment, a belt B14 is stretched between the rotating shaft of the drive motor M14 and the back bottom roller 14a. The drive motor M14 transmits the rotational force to the back bottom roller 14a via the belt B14. The drive motor M15 rotates the third bottom roller 15a. In the present embodiment, a belt B15 is stretched between the rotation shaft of the drive motor M15 and the third bottom roller 15a. The drive motor M15 transmits the rotational force to the third bottom roller 15a via the belt B15. The output torques of the drive motors M14 and M15 are controlled by the unit controller 10. In the present embodiment, for example, stepping motors are used as the drive motors M14 and M15.

  The middle bottom roller 16a and the front bottom roller 17a are rotated by the power from the second end frame 5. That is, the back bottom roller 14 a and the third bottom roller 15 a are rotated independently of each other for each spinning unit 2. The middle bottom roller 16a and the front bottom roller 17a are rotated in common by the plurality of spinning units 2 as a whole. The bottom rollers 14a, 15a, 16a, and 17a are rotated at different rotational speeds so as to become faster toward the downstream side by the driving motors M14 and M15 and the power from the second end frame 5.

  The back top roller 14b, the third top roller 15b, the middle top roller 16b, and the front top roller 17b are rotatably supported by the draft cradle 71. Each of the top rollers 14b, 15b, 16b, and 17b is brought into contact with each of the bottom rollers 14a, 15a, 16a, and 17a with a predetermined pressure, and is driven to rotate.

  In the draft cradle 71, each top roller 14b, 15b, 16b and 17b is in contact with each bottom roller 14a, 15a, 16a and 17a with a predetermined pressure, and each top roller 14b, 15b, 16b and 17b is each bottom roller. 14a, 15a, 16a, and 17a can be rotated around the support shaft 72 to positions separated from each other. The rotation of the draft cradle 71 is performed using a handle (not shown) provided on the draft cradle 71. The draft cradle 71 rotatably supports the top rollers 14b, 15b, 16b, and 17b of the draft device 6 provided in each of a pair of adjacent spinning units 2. That is, the draft cradle 71 is shared by the draft device 6 included in each of the pair of adjacent spinning units 2.

  The representative draft device 6A further includes rotary encoders (rotation detectors) R14a, R14b, R15a, and R15b. The rotary encoder R14a is provided around the rotation axis of the back bottom roller 14a, and detects the rotation speed (the number of rotations per unit time) of the back bottom roller 14a. The rotary encoder R14b is provided around the rotation axis of the backtop roller 14b and detects the rotation speed of the backtop roller 14b.

  The rotary encoder R15a is provided around the rotation axis of the third bottom roller 15a, and detects the rotation speed of the third bottom roller 15a. The rotary encoder R15b is provided around the rotation axis of the third top roller 15b and detects the rotation speed of the third top roller 15b. The rotary encoders R14a, R14b, R15a, and R15b output the detection results to the unit controller 10.

  Here, changes in the rotational speeds of the bottom rollers 14a and 15a and the top rollers 14b and 15b will be described. When the sliver S is drafted, if the output torque of the drive motors M14 and M15 is sufficiently larger than the torque required to draft the sliver S, the rotational speeds of the bottom rollers 14a and 15a and the top rollers 14b and 15b are constant. It remains unchanged (almost unchanged). For this reason, as shown in FIG. 3A, the rotational speeds detected by the rotary encoders R14a, R14b, R15a, and R15b remain constant (almost unchanged).

  In FIGS. 3A and 3B, the graph with the symbol S14a indicates the rotational speed of the back bottom roller 14a, and the graph with the symbol S14b indicates the rotational speed of the backtop roller 14b. ing. Further, the graph with the symbol S15a indicates the rotational speed of the third bottom roller 15a, and the graph with the symbol S15b indicates the rotational speed of the third top roller 15b. Further, the diameter of the back bottom roller 14a and the diameter of the back top roller 14b are different from each other. For this reason, the rotational speed of the back bottom roller 14a and the rotational speed of the back top roller 14b are different from each other. However, the peripheral speed of the back bottom roller 14a and the peripheral speed of the back top roller 14b are the same. Similarly, the diameter of the third bottom roller 15a and the diameter of the third top roller 15b are different from each other. For this reason, the rotational speed of the third bottom roller 15a and the rotational speed of the third top roller 15b are different from each other. However, the circumferential speed of the third bottom roller 15a and the circumferential speed of the third top roller 15b are the same.

  When the output torque of the drive motors M14 and M15 is smaller than the torque required for drafting the sliver S, the sliver S cannot travel properly, and the bottom rollers 14a and 15a and the top rollers 14b and 15b At least one of the rotational speeds fluctuates in the direction of decreasing speed (the rotational speed decreases). For this reason, as shown in FIG. 3B, at least one of the rotational speeds detected by the rotary encoders R14a, R14b, R15a, and R15b varies. In the example shown in FIG. 3B, the rotation speed of the third top roller 15b is changed. In the example shown in FIG. 3B, the rotational speed of the third top roller 15b is reduced to about 5 rpm, for example, between time t1 and time t2, and then returned to the original rotational speed again. Is shown. In the example shown in FIG. 3B, the case where the rotational speed fluctuates a plurality of times, such as from time t1 to time t2 and from time t3 to time t4, is shown.

  Next, the general draft device 6B provided in the general spinning unit 2B will be described. As shown in FIG. 4, the general draft device 6B is different from the representative draft device 6A shown in FIG. 2 only in that the rotary encoders R14a, R14b, R15a, and R15b are not provided. That is, the general draft device 6B includes a back roller pair (second roller pair) 14, a third roller pair (second roller pair) 15, a middle roller pair 16, a front roller pair 17 and the like, similarly to the representative draft device 6A. Have. Thus, the number of roller pairs 14, 15, 16, and 17 provided in the representative drafting device 6A is the same as the number of roller pairs 14, 15, 16, and 17 provided in the general draft device 6B. . Further, the shape (diameter) of the roller pair 14, 15, 16, and 17 provided in the representative draft device 6A and the shape (diameter) of the roller pair 14, 15, 16, and 17 provided in the general draft device 6B are also mutually equal. The same.

  The back roller pair (second roller pair) 14 of the general draft device 6B includes a back bottom roller (second drive roller) 14a and a back top roller (second driven roller) that are opposed to each other across a travel route R on which the sliver S travels. ) 14b. The third roller pair (second roller pair) 15 includes a third bottom roller (second driving roller) 15a and a third top roller (second driven roller) 15b that are opposed to each other with the travel route R interposed therebetween. The middle roller pair 16 includes a middle bottom roller 16a and a middle top roller 16b that face each other across the travel route R. The front roller pair 17 includes a front bottom roller 17a and a front top roller 17b that face each other across the travel route R. The plurality of roller pairs 14, 15, 16 and 17 feed the sliver S supplied from a can (not shown) and guided by the fiber bundle guide 77 from the upstream side to the downstream side while drafting.

  Similar to the representative draft device 6A, the general draft device 6B further includes a drive motor (second motor) M14 that rotates the back bottom roller 14a and a drive motor (second motor) M15 that rotates the third bottom roller 15a. Yes. Thus, the number of drive motors M14 and M15 provided in the representative draft device 6A is the same as the number of drive motors M14 and M15 provided in the general draft device 6B. The drive motors M14 and M15 of the general draft device 6B are in the moving direction of the sliver S and the roller pairs 14 and 15 rotated by the drive motors M14 and M15 of the representative draft device 6A among the bottom rollers 14a, 15a, 16a and 17a. The roller pairs 14 and 15 provided at the same position are rotated. The other configuration of the general draft device 6B is the same as that of the representative draft device 6A.

  Next, control of output torque performed on the drive motors M14 and M15 of the draft device 6 among various controls performed by the unit control device 10 on each part of the spinning unit 2 will be described. The unit controller 10 sets a target output torque value for each of the drive motors M14 and M15 provided in the spinning unit 2, and controls the output torque of the drive motors M14 and M15 based on the set target output torque value. To do. For example, when the drive motors M14 and M15 are stepping motors, the unit controller 10 can control the output torque of the drive motors M14 and M15 by controlling the current value supplied to the drive motors M14 and M15. .

  Based on the detection results detected by the rotary encoders R14a, R14b, R15a and R15b provided in the representative draft device 6A during the draft of the sliver S, the unit control device 10 drives the drive motor M14 provided in the representative draft device 6A. And M15, and output torques of drive motors M14 and M15 provided in the general draft device 6B.

  Here, when the sliver S supplied to the representative spinning unit 2A and the general spinning unit 2B is the same, the representative draft device 6A and the general draft device 6B can be operated under the same setting conditions. In the present embodiment, the same sliver S is supplied to each of the plurality of spinning units 2 provided in the spinning machine 1. For this reason, the unit control device 10 determines the drive motors M14 and M15 of the representative draft device 6A and the drive motors M14 and M15 of the general draft device 6B based on the detection result of the rotary encoder R14a provided in the representative draft device 6A. Can be controlled using the same target output torque value.

  Here, as shown in FIG. 5, the spinning machine 1 includes a plurality of unit control devices 10. Each of the unit control devices 10 controls a plurality of spinning units 2 assigned as control targets. For convenience of explanation, the unit control device 10 including the representative spinning unit 2A as a control target is assumed to be a representative unit control device (motor control unit) 10A. That is, the representative unit controller 10A is a unit controller (first unit controller) that controls the representative spinning unit 2A. The representative unit control device 10A is a unit control device that controls the representative spinning unit 2A and the general spinning unit 2B.

  On the other hand, a unit control device 10 that does not include the representative spinning unit 2A as a control target is a general unit control device 10B. That is, the general unit control device 10B is a unit control device (second unit control device) that controls the general spinning unit 2B.

  The representative draft device 6A and the representative unit control device 10A constitute a draft system that controls the output torques of the drive motors M14 and M15 of the representative draft device 6A based on the detection results of the rotary encoder R14a and the like. The representative spinning unit 2A and the representative unit control device 10A constitute a spinning system that generates the yarn Y while controlling the output torque of the drive motors M14 and M15 of the representative draft device 6A based on the detection result of the rotary encoder R14a and the like. To do.

  First, a process for setting the target output torque values of the drive motors M14 and M15 of the representative draft device 6A that is the control target of the representative unit control device 10A will be described. Based on the detection results of the rotary encoders R14a, R14b, R15a and R15b provided in the representative draft device 6A, the representative unit control device 10A rotates the bottom rollers 14a and 15a and the top rollers 14b and 15b of the representative draft device 6A. Is constantly monitored. Then, the representative unit control device 10A determines whether or not the rotation speed of the back bottom roller 14a or the like has fluctuated by a predetermined determination value or more in the speed decreasing direction. When the rotational speed fluctuates more than the determination value, the representative unit control device 10A includes the roller pair 14 or 15 including the back bottom roller 14a and the like whose rotation speed fluctuates more than the determination value among the back roller pair 14 and the third roller pair 15. The target output torque value of the drive motor M14 or M15 to be rotated is increased by a predetermined first torque value. That is, a value obtained by adding the first torque value to the current target output torque value is set as a new target output torque value. For example, the first torque value is preferably a value of several percent (for example, 10%) of the target output torque value. The first torque value may be a value other than 10% of the target output torque value.

  For example, when the rotational speed of the back bottom roller 14a or the back top roller 14b of the representative draft device 6A fluctuates more than the determination value, the representative unit control device 10A increases the target output torque value of the drive motor M14 by the first torque value. When the rotational speed of the third bottom roller 15a or the third top roller 15b of the representative draft device 6A varies more than the determination value, the representative unit control device 10A increases the target output torque value of the drive motor M15 by the first torque value. Here, the value of the first torque value may be different between the case where the target output torque value of the drive motor M14 is increased and the case where the target output torque value of the drive motor M15 is increased. Good.

  Further, when the rotation speed of the roller 14a or 14b fluctuates more than the determination value in the speed decreasing direction, the representative unit control device 10A rotates the roller pair 15 other than the roller pair 14 including the roller 14a or 14b whose rotation speed fluctuates. The target output torque value of the drive motor M15 is increased by a predetermined second torque value. When the rotational speed of the roller 15a or 15b fluctuates more than the determination value in the direction of decreasing speed, the representative unit control apparatus 10A rotates the roller pair 14 other than the roller pair 15 including the roller 15a or 15b whose rotational speed fluctuated. The target output torque value of M14 is increased by a predetermined second torque value. That is, a value obtained by adding the second torque value to the current target output torque value is set as a new target output torque value for the motor of the roller pair whose rotational speed has not changed. For example, the second torque value is preferably a value of several percent (for example, 10%) of the target output torque value. The second torque value may be a value other than 10% of the target output torque value.

  For example, when the rotational speed of the back bottom roller 14a or the back top roller 14b of the representative draft device 6A fluctuates more than the determination value, the representative unit control device 10A sets the target output torque value of the drive motor M15 that rotates the third roller pair 15 Increase the second torque value. When the rotation speed of the third bottom roller 15a or the third top roller 15b of the representative draft device 6A fluctuates more than the determination value, the representative unit control device 10A sets the target output torque value of the drive motor M14 that rotates the back roller pair 14 to the second value. Increase the torque value. Here, the second torque value may be the same value as the first torque value or a different value. Further, the second torque value may be different or the same between when the target output torque value of the drive motor M14 is increased and when the target output torque value of the drive motor M15 is increased. .

  Further, the representative unit control device 10A reduces the target output torque values of the drive motors M14 and M15 of the representative draft device 6A based on the detection result of the rotary encoder R14a and the like. Specifically, the representative unit control apparatus 10A determines that the rotation speeds of the bottom rollers 14a and 15a and the top rollers 14b and 15b fluctuate by a predetermined determination value or more in a speed decreasing direction for a predetermined time or more. If not detected, the target output torque values of the drive motors M14 and M15 of the representative draft device 6A are reduced by a predetermined third torque value. Note that the representative unit control device 10A may reduce the target output torque value of at least one of the drive motors M14 and M15 instead of both of the drive motors M14 and M15. Further, the third torque value may be the same or may be the same when the output torque of the drive motor M14 is reduced and when the target output torque value of the drive motor M15 is reduced. The representative unit control device 10A detects that the rotation speed of at least one of the bottom rollers 14a and 15a and the top rollers 14b and 15b fluctuates more than a predetermined determination value in the speed decreasing direction for a predetermined time or more. If not, the target output torque values of the drive motors M14 and M15 of the representative draft device 6A may be reduced by a predetermined third torque value.

  As described above, the representative unit control device 10A sets the target output torque values of the drive motors M14 and M15 of the representative draft device 6A based on the detection results of the rotary encoder R14a and the like. Then, the representative unit control device 10A controls the output torque of the drive motors M14 and M15 of the representative draft device 6A assigned as the control target based on the set target output torque value.

  Next, processing for setting the target output torque values of the drive motors M14 and M15 of the general draft device 6B that is the control target of the representative unit control device 10A will be described. The representative unit control device 10A sets the target output torque values set for the drive motors M14 and M15 of the representative draft device 6A as the target output torque values set for the drive motors M14 and M15 of the general draft device 6B, respectively. Specifically, when the representative unit control device 10A sets the target output torque value of the drive motor M14 of the general draft device 6B, the drive motor M14 of the general draft device 6B that is the target of setting the target output torque value rotates. A target output torque value set for the drive motor M14 that rotates the back roller pair 14 of the representative drafting device 6A, which is a roller pair provided at the same position as the back roller pair 14, is set.

  Here, the roller pair provided at the same position is the upstream side in the moving direction of the sliver S during drafting among the roller pairs 14, 15, 16, and 17 included in the representative draft device 6A and the general draft device 6B, respectively. A pair of rollers having the same order when counted from. That is, the back roller pair 14 of the representative draft device 6A and the back roller pair 14 of the general draft device 6B are roller pairs provided at the same alignment position. The third roller pair 15 of the representative draft device 6A and the third roller pair 15 of the general draft device 6B are roller pairs provided in the same line position.

  Similarly, when the representative unit control device 10A sets the target output torque value of the drive motor M15 of the general draft device 6B, the third roller that the drive motor M15 of the general draft device 6B that is the target of setting the target output torque value rotates. A target output torque value set for the drive motor M15 for rotating the third roller pair 15 of the representative drafting device 6A, which is a roller pair provided at the same position as the pair 15, is set.

  As described above, the representative unit control device 10A uses the target output torque values set for the drive motors M14 and M15 of the representative draft device 6A to set the target output torque values of the drive motors M14 and M15 of the general draft device 6B, respectively. Set. Then, the representative unit control device 10A controls the output torques of the drive motors M14 and M15 of the general draft device 6B assigned as the control target based on the set target output torque value.

  Next, processing for setting the target output torque values of the drive motors M14 and M15 of the general draft device 6B that is the control target of the general unit control device 10B will be described. The general unit control device 10B sets the target outputs of the drive motors M14 and M15 of the representative draft device 6A set by the representative unit control device 10A as target output torque values set for the drive motors M14 and M15 of the general draft device 6B. Use the torque value. The general unit control device 10B acquires the target output torque values of the drive motors M14 and M15 of the representative draft device 6A directly from the representative unit control device 10A through the communication line, or through the communication line via the machine control device 5a. .

  Specifically, when setting the target output torque value of the drive motor M14 of the general draft device 6B, the general unit control device 10B rotates the drive motor M14 of the general draft device 6B that is the target of setting the target output torque value. A target output torque value set for the drive motor M14 that rotates the back roller pair 14 of the representative drafting device 6A, which is a roller pair provided at the same position as the back roller pair 14, is set. Similarly, when the general unit control device 10B sets the target output torque value of the drive motor M15 of the general draft device 6B, the third roller that the drive motor M15 of the general draft device 6B that is the target of setting the target output torque value rotates. A target output torque value set for the drive motor M15 that rotates the third roller pair 15 of the representative drafting device 6A, which is a roller pair provided at the same position as the pair 15, is set.

  As described above, the general unit control device 10B uses the target output torque values set for the drive motors M14 and M15 of the representative draft device 6A to set the target output torque values of the drive motors M14 and M15 of the general draft device 6B, respectively. Set. Then, the general unit control device 10B controls the output torques of the drive motors M14 and M15 of the general draft device 6B assigned as the control target based on the set target output torque value.

  Next, an example of timing when the representative unit control device 10A and the general unit control device 10B set the target output torque values of the drive motors M14 and M15 will be described. First, the spinning machine 1 generates the yarn Y using only the representative spinning unit 2A. The representative unit control device 10A repeatedly performs the above-described control for reducing the target output torque value by the third torque value when the yarn is generated only by the representative spinning unit 2A. That is, the representative unit control device 10A gradually decreases the output torque of the drive motors M14 and M15. Then, the representative unit control device 10A, when the rotational speed of any of the bottom rollers 14a and 15a and the top rollers 14b and 15b of the representative draft device 6A fluctuates more than the determination value in the speed decreasing direction, Control for increasing the first output torque value of M15 and control for increasing the second torque value are performed. That is, the representative unit control device 10A increases the output torque of the drive motors M14 and M15.

  After the rotational speed of the back bottom roller 14a and the like of the representative draft device 6A fluctuates more than the determination value in the speed reduction direction, the representative unit control device 10A stops the control for reducing the target output torque value described above to the third torque value. . Then, the representative unit control device 10A continuously performs the above-described control for increasing the target output torque value and the control for increasing the second torque value for a predetermined time based on the detection result of the rotary encoder R14a and the like. Thereby, the representative unit control device 10A can obtain the target output torque values of the drive motors M14 and M15 that are optimal for drafting the sliver S by the representative draft device 6A.

  After the optimum target output torque value is obtained, before the generation of the yarn Y in the plurality of spinning units 2 as a whole, the representative unit control device 10A sets the target output torque values of the drive motors M14 and M15 of the general draft device 6B. As described above, the target output torque values set for the drive motors M14 and M15 of the representative draft device 6A are set. Similarly, as described above, the general unit control device 10B sets the target output torque values set in the drive motors M14 and M15 of the representative draft device 6A as the target output torque values of the drive motors M14 and M15 of the general draft device 6B. Set.

  Thereby, target output torque values are set for the drive motors M14 and M15 of all the draft devices 6. After the target output torque values are set for the drive motors M14 and M15 of all the draft devices 6, the spinning machine 1 starts to generate the yarn Y in the plurality of spinning units 2 as a whole.

  Note that during the generation of the yarn Y in the plurality of spinning units 2 as a whole, the representative unit control device 10A performs the above-described representation of the representative draft device 6A based on the change in the rotational speed of the back bottom roller 14a and the like of the representative draft device 6A. The control for increasing the target output torque values of the drive motors M14 and M15 by the first torque value and the control for increasing the second torque value may be continuously performed. In this case, the representative unit control device 10A and the general unit control device 10B set the target output torque values of the drive motors M14 and M15 of the general draft device 6B and the target output torque values of the drive motors M14 and M15 of the representative draft device 6A. Set (change) in conjunction with (Change).

  As described above, when the rotational speed of the bottom rollers 14a and 15a and the top rollers 14b and 15b of the representative drafting device 6A is reduced, the representative unit control device 10A has the bottom rollers 14a and 15a and the tops having the reduced rotational speed. The target output torque value of the drive motor M14 or M15 that rotates the roller pair 14 or 15 having the rollers 14b and 15b is increased by the first torque value. As a result, the reduction in the rotational speed of the bottom rollers 14a and 15a and the top rollers 14b and 15b due to the lack of output torque of the drive motors M14 and M15 is suppressed, so that the representative drafting device 6A stabilizes the sliver S. Can be drafted. Further, by setting the amount of increase to the first torque value, it is possible to slightly increase the target output torque value, preventing the target output torque value from exceeding the required torque, and wasting energy. Can avoid unnecessary consumption. For this reason, the spinning machine 1 can appropriately control the output torques of the drive motors M14 and M15 of the representative draft device 6A according to the sliver S to be used.

  Further, the number of roller pairs 14, 15, 16, and 17 of the representative draft device 6A is the same as the number of roller pairs 14, 15, 16, and 17 of the general draft device 6B. For this reason, it is conceivable that fluctuations in the rotational speed that occur in the back roller pair 14 provided in the representative draft device 6A also occur in the same manner on the general draft device 6B side. Therefore, the representative unit control device 10A and the general unit control device 10B use the target output torque set in the drive motors M14 and M15 of the representative draft device 6A as the target output torque values of the drive motors M14 and M15 of the general draft device 6B. Set the value. As a result, the general draft device 6B has a sliver by suppressing a decrease in the rotational speed of the bottom rollers 14a and 15a and the top rollers 14b and 15b due to insufficient output torque of the drive motors M14 and M15 of the general draft device 6B. S can be drafted stably. For this reason, the spinning machine 1 can appropriately control the output torques of the drive motors M14 and M15 of the general draft device 6B according to the sliver S to be used. Since the draft draft of the sliver S is suppressed in the representative draft device 6A and the general draft device 6B, the spinning machine 1 can suppress the quality of the yarn Y from being lowered. Further, the rotary encoder R14a and the like for detecting the rotational speed of the back bottom roller 14a and the like need only be provided in the representative draft device 6A. For this reason, in the general draft device 6B, the installation of the rotary encoder R14a and the like is not necessary.

  When the rotational speed of the roller 14a or 14b fluctuates more than the determination value in the speed decreasing direction, the representative unit control apparatus 10A rotates the roller pair 15 other than the roller pair 14 including the roller 14a or 14b whose rotational speed fluctuated. The target output torque value of M15 is increased by a predetermined second torque value. When the rotational speed of the roller 15a or 15b fluctuates more than the determination value in the direction of decreasing speed, the representative unit control apparatus 10A rotates the roller pair 14 other than the roller pair 15 including the roller 15a or 15b whose rotational speed fluctuated. The target output torque value of M14 is increased by a predetermined second torque value. As a result, the representative unit control device 10A causes the drive motor M14 and the third roller pair 15 that rotate the back roller pair 14 as the rotational speed of the back roller pair 14 side roller or the third roller pair 15 side roller decreases. Each target output torque value of the drive motor M15 to be rotated can be increased. Further, by setting the amount of increase to the second torque value, it is possible to slightly increase the target output torque value and avoid unnecessary energy consumption. Further, the representative unit control device 10A and the general unit control device 10B set the target output torque values set in the drive motors M14 and M15 of the representative draft device 6A as the target output torque values of the drive motors M14 and M15 of the general draft device 6B. Set. For this reason, the representative unit control device 10A and the general unit control device 10B increase the target output torque values of the drive motors M14 and M15 of the general draft device 6B in the same manner as the control of the drive motors M14 and M15 of the representative draft device 6A. Can do. As a result, the representative unit control device 10A and the general unit control device 10B set the target output torque values of the drive motor M14 that rotates the back roller pair 14 and the drive motor M15 that rotates the third roller pair 15 of the general draft device 6B. Can be raised.

  If the representative unit control device 10A does not detect that the rotational speed detected by the rotary encoder R14a or the like fluctuates more than the determination value in the speed decreasing direction for a predetermined time or more, the representative unit control device 10A drives the drive motors M14 and M15 The target output torque value is decreased by a predetermined third torque value. Here, when the rotation speeds of the bottom rollers 14a and 15a and the top rollers 14b and 15b do not decrease, it is conceivable that the output torque of the drive motors M14 and M15 is sufficiently larger than the required torque. For this reason, the representative unit control device 10A reduces the output torque of the drive motors M14 and M15 of the representative draft device 6A when the decrease in the rotational speed detected by the rotary encoder R14a or the like is not detected for a predetermined time or more. . Thereby, the representative unit control device 10A can appropriately control the output torques of the drive motors M14 and M15 of the representative draft device 6A. The representative unit control device 10A and the general unit control device 10B set the target output torque values set in the drive motors M14 and M15 of the representative draft device 6A as the target output torque values of the drive motors M14 and M15 of the general draft device 6B. To do. Therefore, the representative unit control device 10A and the general unit control device 10B can reduce the output torques of the drive motors M14 and M15 of the general draft device 6B in the same manner as the control of the drive motors M14 and M15 of the representative draft device 6A. . Thereby, the representative unit control device 10A and the general unit control device 10B can appropriately control the output torques of the drive motors M14 and M15 of the general draft device 6B.

  The spinning machine 1 includes a plurality of spinning units 2. The back roller pair 14 and the third roller pair 15 of the plurality of spinning units 2 are rotated independently of each other for each spinning unit 2. Thus, the output torques of the drive motors M14 and M15 of the back roller pair 14 and the third roller pair 15 that are rotated independently of each other for each spinning unit 2 can be appropriately controlled according to the sliver S to be used. it can.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, in this embodiment, changes in the rotational speeds of the bottom rollers 14a and 15a and the top rollers 14b and 15b are detected using the rotary encoders R14a, R14b, R15a, and R15b, respectively. May be used. For example, a rotation detector that irradiates light toward the reflecting member attached to the backtop roller 14b and detects the rotation speed based on the light reflected by the reflecting member may be used.

  The representative draft device 6A only needs to include at least one of the rotary encoders R14a, R14b, R15a, and R15b. In particular, the representative draft device 6A preferably includes a rotary encoder R15b that detects at least the rotational speed of the third top roller 15b. That is, the representative draft device 6A rotates the third top roller 15b of the third roller pair 15 located second from the upstream side in the moving direction of the sliver S during drafting among the roller pairs 14, 15, 16, and 17. It is preferable that at least a rotary encoder R15b for detecting the speed is provided. Here, among the roller pairs 14, 15, 16 and 17 provided in the representative draft device 6A, the back roller pair 14 located on the most upstream side only draws the sliver S conveyed toward the representative draft device 6A. And the load is small. The second and subsequent roller pairs 15, 16, and 17 from the upstream side become gradually narrower as the sliver S is gradually drafted, so that the load decreases in order toward the downstream side. For this reason, a large load is applied to the second third roller pair 15 from the upstream side in the moving direction of the sliver S. Therefore, among the roller pairs 14, 15, 16, and 17, the rotation speed of the third roller pair 15 that is located second from the upstream side in the moving direction of the sliver S is likely to change. When the output torque of the drive motor M15 is insufficient, in particular, the rotational speed of the third top roller 15b in the third roller pair 15 located second from the upstream side often decreases. Therefore, by detecting the rotational speed of the third top roller 15b of the third roller pair 15 positioned second from the upstream side, the representative drafting device 6A can preferably detect the shortage of the output torque of the drive motor M15. it can. By using the detection result of the rotary encoder R15a that detects the rotation speed of the third top roller 15b, it is possible to appropriately control the output torque of the drive motor M15 according to the sliver S to be used.

  The spinning unit 2 has the back roller pair 14 and the third roller pair 15 as the pair of rollers that are rotated independently of each other for each spinning unit 2, but the number of the roller pairs that are independently rotated is two. It is not limited. The number of roller pairs rotated independently of each other for each spinning unit 2 may be one, or may be three or more.

  As shown in FIG. 5, the representative unit control apparatus 10A controls the representative spinning unit 2A and the plurality of general spinning units 2B, but may control only the representative spinning unit 2A. In FIG. 5, only one representative unit control device 10A and one representative spinning unit 2A are shown, but the number of representative unit control devices 10A and representative spinning units 2A included in the spinning machine 1 may be two or more.

  For example, when a plurality of representative unit control devices 10A and two representative spinning units 2A are provided for the spinning machine 1, each representative unit control device 10A may control one representative spinning unit 2A.

  For example, a plurality of representative spinning units 2A may be provided for the spinning machine 1, and one representative unit controller 10A may control the plurality of representative spinning units 2A. The spinning machine 1 may be provided with a plurality of representative unit control devices 10A that control a plurality of representative spinning units 2A. When one representative unit control device 10A controls a plurality of representative spinning units 2A in this way, the representative unit control device 10A detects from the rotary encoders R14a, R14b, R15a and R15b provided in each representative draft device 6A. Get the result. Then, the representative unit control device 10A may set the target output torque values of the drive motors M14 and M15 based on the obtained plurality of detection results. For example, the representative unit control device 10A calculates the average value of the rotational speed for each of the bottom rollers 14a and 15a and the top rollers 14b and 15b based on the plurality of acquired detection results. Then, the representative unit control device 10A determines the target output torque values of the drive motors M14 and M15 provided in the plurality of representative draft devices 6A based on the calculated average values of the rotational speeds of the rollers 14a, 14b, 15a and 15b. May be set respectively. If the target output torque value is set based on the average value, a more preferable target output torque value can be obtained. That is, each of the plurality of spinning units 2 included in the spinning machine 1 is considered to have some individual differences. However, when a target output torque value is set with only one spinning unit 2 as a representative spinning unit 2A, When the representative spinning unit 2A is a special individual, the special is reflected in the target output torque value. However, if the average value is taken, it is possible to obtain a target output torque value that does not reflect such individual differences (suppresses reflection).

  For example, a single spinning machine 1 may be provided with only one representative unit control device 10A, and all the spinning units 2 under the control of this one representative unit control device 10A may be used as the representative spinning unit 2A. Specifically, for example, when the representative unit control apparatus 10A controls four spinning units 2, all four are designated as representative spinning units 2A. For example, the representative unit control apparatus 10A controls eight spinning units 2. In the case where all of these are made, all eight are designated as the representative spinning unit 2A. The number of representative spinning units 2A is preferably 4 or more and 8 or less.

  Various controls executed by the representative unit control device 10A described above may be performed by the machine base control device 5a.

  In the spinning unit 2, each device is arranged so that the yarn Y supplied on the upper side is wound on the lower side in the machine table height direction, but each device has the yarn Y supplied on the lower side. You may arrange | position so that it may be wound up by the upper side. In FIG. 1, the spinning machine 1 is illustrated so as to wind up the cheese-shaped package P, but it is also possible to wind up the cone-shaped package P.

  In the spinning unit 2, the yarn storage device 11 has a function of drawing the yarn Y from the pneumatic spinning device 7. However, the yarn Y may be drawn from the pneumatic spinning device 7 by the delivery roller and the nip roller. When the yarn Y is pulled out from the pneumatic spinning device 7 by the delivery roller and the nip roller, a slack tube or a mechanical compensator that absorbs slackness of the yarn Y by a suction air flow may be provided instead of the yarn accumulating device 11.

  In the traveling direction of the yarn Y, the tension sensor 9 may be arranged on the upstream side of the yarn monitoring device 8. In the spinning unit 2, the waxing device 12, the tension sensor 9, and the yarn monitoring device 8 may be omitted.

  The present invention is not limited to application to a spinning machine including the pneumatic spinning device 7 as described above. The present invention relates to a draft device / draft system having a pair of rollers rotated by a motor and drafting a fiber bundle, and a textile machine equipped with such a draft device / draft system (for example, a ring spinning machine, an open-end spinning machine, a rough spinning machine, It can be applied to a spinning machine.

  DESCRIPTION OF SYMBOLS 1 ... Spinning machine, 2A ... Representative spinning unit (first spinning unit), 2B ... General spinning unit (second spinning unit), 6A ... Representative draft device (first draft device), 6B ... General draft device (second draft) Device), 7 ... pneumatic spinning device (first pneumatic spinning device, second pneumatic spinning device), 10A ... representative unit control device (motor control unit, first unit control device, unit control device), 10B ... general unit control device (Second unit control device), 13 ... winding device (first winding device, second winding device), 14 ... back roller pair (roller pair, first roller pair, second roller pair), 14a ... back Bottom roller (driving roller, first driving roller, second driving roller), 14b ... Back top roller (driven roller, first driven roller, second driven roller), 15 ... Third roller pair (low Pair, first roller pair), 15a ... third bottom roller (drive roller, first drive roller, second drive roller), 15b ... third top roller (driven roller, first driven roller, second driven roller), M14, M15: Drive motor (motor, first motor, second motor), R14a, R14b, R15a, R15b ... Rotary encoder (rotation detector), S ... Sliver (fiber bundle), F ... Fiber bundle, Y ... Yarn, P …package.

Claims (12)

A plurality of roller pairs each having a driving roller and a driven roller that rotates as the driving roller rotates, and drafting a fiber bundle;
A plurality of motors that respectively rotate the plurality of drive rollers;
One or a plurality of rotation detectors for detecting a rotation speed of at least one of the plurality of driving rollers and the plurality of driven rollers;
A motor control unit that sets a target output torque value for each of the plurality of motors and controls the output torque of the plurality of motors based on the set target output torque value;
With
When the rotation speed detected by the rotation detection unit fluctuates more than a predetermined determination value in the speed reduction direction, the motor control unit is configured to drive the driven roller or the driven roller whose rotation speed fluctuates more than the determination value. A draft system that increases the target output torque value of the motor that rotates the roller pair having a predetermined first torque value.   The motor control unit includes the drive roller or the driven roller in which the rotation speed fluctuates more than the determination value when the rotation speed detected by the rotation detection unit fluctuates by more than the determination value in a speed decreasing direction. The draft system according to claim 1, wherein the target output torque value of the motor that rotates the roller pair other than the roller pair is increased by a predetermined second torque value.   The motor control unit is configured to detect at least one of a plurality of the motors when the rotation speed detected by the rotation detection unit is not detected for a predetermined time or more when the rotation speed fluctuates more than the determination value in the speed decreasing direction. The draft system according to claim 1 or 2, wherein the target output torque value is decreased by a predetermined third torque value. The draft system according to any one of claims 1 to 3,
An air spinning device for producing a yarn by twisting the fiber bundle drafted by the draft system;
A spinning system comprising: a winding device that winds up the yarn generated by the pneumatic spinning device to form a package. A plurality of the spinning systems according to claim 4,
At least one of the plurality of drive rollers is independently rotated for each of the drive rollers,
The spinning detector detects a rotation speed of at least one of the drive roller that is rotated independently and the driven roller that rotates as the drive roller rotates. A spinning machine comprising: a first spinning unit; a first unit control device that controls the first spinning unit; a second spinning unit; and a second unit control device that controls the second spinning unit;
The first spinning unit is
A first draft device for drafting fiber bundles;
A first pneumatic spinning device for producing a yarn by twisting the fiber bundle drafted by the first draft device;
A first winding device that winds up the yarn generated by the first pneumatic spinning device to form a package;
With
The first draft device includes:
A plurality of first roller pairs each having a first drive roller and a first driven roller that rotates with the rotation of the first drive roller and drafting the fiber bundle;
One or a plurality of first motors that are provided for at least one of the plurality of first driving rollers, and that rotate the first driving roller independently for each of the first driving rollers;
One or a plurality of rotation detectors for detecting the rotational speed of at least one of the first driving roller that is independently rotated and the first driven roller that rotates in accordance with the rotation of the first driving roller;
With
The first unit controller is
Setting a target output torque value for each of the one or more first motors, respectively controlling the output torque of the one or more first motors based on the set target output torque values;
When the rotation speed detected by the rotation detection unit fluctuates more than a predetermined determination value in the speed decreasing direction, the first driving roller or the first driven roller has the rotation speed fluctuated more than the determination value. Increasing the target output torque value of the first motor for rotating the first roller pair to a predetermined first torque value;
The second spinning unit is
A second draft device for drafting fiber bundles;
A second pneumatic spinning device for producing a yarn by twisting the fiber bundle drafted by the second draft device;
A second winding device that winds the yarn generated by the second pneumatic spinning device to form a package;
With
The second draft device includes:
A plurality of second roller pairs each having a second driven roller and a second driven roller that rotates with the rotation of the second driving roller, and drafting the fiber bundle;
One or a plurality of second motors that are provided for at least one of the plurality of second driving rollers and independently rotate the second driving rollers for each of the second driving rollers;
With
The number of the plurality of first roller pairs and the number of the plurality of second roller pairs are the same as each other,
The number of the first motors and the number of the second motors are the same as each other,
The second motor rotates the second roller pair provided in the same alignment position as the first roller pair rotated by the first motor in the moving direction of the fiber bundle during drafting,
The second unit controller is
Setting a target output torque value for each of the one or more second motors, respectively controlling the output torque of the one or more second motors based on the set target output torque values;
The target output torque value set for each of the one or more second motors is provided at the same position as the second roller pair that is rotated by the second motor to be set as the target output torque value. A spinning machine that sets the target output torque value set in the first motor that rotates the first roller pair. A plurality of the first motor and the second motor are provided,
When the rotation speed detected by the rotation detection unit fluctuates by more than the determination value in the direction of decreasing speed, the first unit control device has the first drive roller or the first drive roller that fluctuates by more than the determination value. The spinning machine according to claim 6, wherein a target output torque value of the first motor that rotates the first roller pair other than the first roller pair having one driven roller is increased by a predetermined second torque value. .   When the first unit control device does not detect that the rotation speed detected by the rotation detection unit fluctuates more than the determination value in the speed decreasing direction for a predetermined time or more, one or more of the first unit control devices The spinning machine according to claim 6 or 7, wherein the output torque of at least one of the motors is reduced by a predetermined third torque value. A spinning machine comprising: a first spinning unit; a second spinning unit; and a unit controller for controlling the first spinning unit and the second spinning unit, respectively.
The first spinning unit is
A first draft device for drafting fiber bundles;
A first pneumatic spinning device for producing a yarn by twisting the fiber bundle drafted by the first draft device;
A first winding device that winds up the yarn generated by the first pneumatic spinning device to form a package;
With
The first draft device includes:
A plurality of first roller pairs each having a first drive roller and a first driven roller that rotates with the rotation of the first drive roller and drafting the fiber bundle;
One or a plurality of first motors that are provided for at least one of the plurality of first driving rollers, and that rotate the first driving roller independently for each of the first driving rollers;
One or a plurality of rotation detectors for detecting the rotational speed of at least one of the first driving roller that is independently rotated and the first driven roller that rotates in accordance with the rotation of the first driving roller;
With
The second spinning unit is
A second draft device for drafting fiber bundles;
A second pneumatic spinning device for producing a yarn by twisting the fiber bundle drafted by the second draft device;
A second winding device that winds the yarn generated by the second pneumatic spinning device to form a package;
With
The second draft device includes:
A plurality of second roller pairs each having a second driven roller and a second driven roller that rotates with the rotation of the second driving roller, and drafting the fiber bundle;
One or a plurality of second motors that are provided for at least one of the plurality of second driving rollers and independently rotate the second driving rollers for each of the second driving rollers;
With
The number of the plurality of first roller pairs and the number of the plurality of second roller pairs are the same as each other,
The number of the first motors and the number of the second motors are the same as each other,
The second motor rotates the second roller pair provided in the same alignment position as the first roller pair rotated by the first motor in the moving direction of the fiber bundle during drafting,
The unit controller is
A target output torque value is set for each of the one or more first motors and the one or more second motors, and the one or more first motors and one or more ones are set based on the set target output torque values. Or controlling the output torque of each of the plurality of second motors,
When the rotation speed detected by the rotation detection unit fluctuates more than a predetermined determination value in the speed decreasing direction, the first driving roller or the first driven roller has the rotation speed fluctuated more than the determination value. Increasing the target output torque value of the first motor for rotating the first roller pair to a predetermined first torque value;
As the target output torque value to be set for each of the one or more second motors, the target output torque value is provided at the same position as the second roller pair to be rotated by the second motor to be set. A spinning machine that sets the target output torque value set in the first motor that rotates the first roller pair. A plurality of the first motor and the second motor are provided,
When the rotation speed detected by the rotation detection unit fluctuates by more than the determination value in the direction of decreasing speed, the unit control device has the first drive roller or the first follower in which the rotation speed fluctuates by more than the determination value. The spinning machine according to claim 9, wherein a target output torque value of the first motor that rotates the first roller pair other than the first roller pair having a roller is increased by a predetermined second torque value.   When the unit control device does not detect that the rotation speed detected by the rotation detection unit fluctuates by more than the determination value in the speed decreasing direction for a predetermined time or more, the unit control device The spinning machine according to claim 9 or 10, wherein at least one of the output torques is reduced by a predetermined third torque value. A plurality of roller pairs each having a driving roller and a driven roller that rotates as the driving roller rotates, and drafting a fiber bundle;
A plurality of motors that respectively rotate the plurality of drive rollers;
A rotation detection unit that detects a rotation speed of the driven roller of the roller pair located second from the upstream side in the moving direction of the fiber bundle during drafting by the roller pair among the plurality of roller pairs; A draft device comprising:

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