JP2021130552A - Textile machine and method for grasping yarn tension - Google Patents

Abstract

To always grasp yarn tension easily without deteriorating quality of the yarn in a textile machine.SOLUTION: A textile machine includes a godet roller 20, a motor 30 that generates rotational torque in the godet roller 20, torque information acquisition means for acquiring values corresponding to rotational torque and a control part. And the control part sets the rotational speed of the godet roller 20 to be constant at a predetermined speed, and performs a first rotation torque information acquisition process for acquiring the first predetermined value corresponding to the first rotation torque when the yarn Y is not wound around the godet roller 20, a second rotation torque information acquisition process for acquiring the second predetermined value corresponding to the second rotation torque when the yarn Y is wound around the godet roller 20 while the rotation speed of the godet roller 20 is constant at the predetermined speed and a yarn tension calculation process that calculates the tension-related value related to the tension of the yarn Y wound around the godet roller 20 based on the first predetermined value and the second predetermined value.SELECTED DRAWING: Figure 4

Description

The present invention relates to a method of grasping the tension of a running yarn in a textile machine.

Patent Document 1 discloses a spinning and drawing device as a textile machine used in a yarn production or processing process. In the spinning and drawing apparatus of Patent Document 1, a plurality of first heating rollers around which the yarn spun from the spinning apparatus is wound and the yarn sent from the first heating roller are wound, and the surface temperature is the first heating roller. It has a plurality of second heating rollers that are higher than the above. The yarn feeding speed of the second heating roller is set to be faster than the yarn feeding speed of the first heating roller, and the yarn is drawn by this speed difference.

In the spinning and drawing apparatus of Patent Document 1, in order to properly draw while maintaining the quality of the yarn, it is necessary to grasp the tension of the running yarn and appropriately manage it. For example, conventionally, an operator has been measuring the tension of a yarn by using a tension meter. However, in the spinning and drawing apparatus of Patent Document 1, in general, there are many control points in which the tension of the yarn should be managed in the textile machine, for example, it is necessary to control the tension of the yarn running between the plurality of rollers. exist. Therefore, it is very troublesome for the operator to measure the tension of the yarn at each control point. In addition, since the operator manually measures the measurement, it is not possible to perform the measurement all the time.

Therefore, by installing a tension sensor at each control point, the tension of the running thread can be constantly measured. For example, Patent Document 2 discloses a structure in which a tension sensor for measuring the tension of a yarn is arranged on a yarn path in a false twisting machine which is a textile machine.

JP-A-2016-40429 JP-A-2019-157313

However, many of these tension sensors are generally of the contact type, and the friction generated between the traveling yarn and the tension sensor may deteriorate the quality of the yarn.

An object of the present invention is to easily grasp the tension of a yarn at all times without deteriorating the quality of the yarn in a textile machine.

The textile machine of the first invention includes a roller around which a traveling thread is wound around a peripheral surface, a rotation drive unit that generates a rotation torque on the roller, and a torque information acquisition means that acquires a value corresponding to the rotation torque. The control unit is provided with A thread is wound around the roller by the first rotation torque information acquisition process for acquiring a first predetermined value corresponding to one rotation torque and the torque information acquisition means with the rotation speed of the roller being constant at the predetermined speed. Based on the second rotation torque information acquisition process for acquiring the second predetermined value corresponding to the second rotation torque generated in the roller while the roller is in operation, and the first predetermined value and the second predetermined value, the roller It is characterized in that a thread tension calculation process for calculating a tension-related value related to the tension of the thread wound around the machine is executed.

According to the present invention, the tension-related value of the yarn can be calculated based on a predetermined value corresponding to the rotational torque when the yarn is wound around the roller and when the yarn is not wound, so that the tension-related value of the yarn can be calculated. There is no need to install a tension sensor to grasp the tension. As a result, in the textile machine, the tension of the yarn can be easily grasped at all times without deteriorating the quality of the yarn.

In the fiber machine of the second invention, in the first invention, the tension-related values are the tension of the yarn on the upstream side in the yarn traveling direction in which the yarn travels from the roller and the tension in the yarn traveling direction from the roller. It is characterized by being the value of the tension difference from the tension of the yarn on the downstream side.

The tension difference between the tension of the thread on the upstream side in the thread running direction from the roller and the tension of the thread on the downstream side in the thread running direction from the roller is determined by the characteristics of the roller (for example, the magnitude of the rotation speed and the rotation torque). It is determined in advance depending on the type of thread to be wound. According to the present invention, it is possible to easily determine whether or not the tension of the yarn is appropriate by comparing the tension difference calculated in the yarn tension calculation process with the predetermined tension difference.

In the first or second invention, the textile machine of the third invention includes an output unit that outputs a current and a motor that generates a rotational torque corresponding to the current output from the output unit. In the first rotation torque information acquisition process, the control unit acquires the first current as the first predetermined value, and in the second rotation torque information acquisition process, the control unit acquires the second current as the second predetermined value. It is characterized in that a current is acquired and the tension-related value is calculated based on the first current and the second current in the thread tension calculation process.

According to the present invention, the tension-related value of the yarn can be calculated based on the current flowing through the motor when the rotational torque is generated in the roller, so that the tension-related value of the yarn can be calculated as compared with the case of directly detecting the tension-related value of the yarn. , The tension of the thread can be easily grasped.

In the third invention, the textile machine of the fourth invention uses the torque information acquisition means to obtain the rotation torque based on the rotation angle detecting means for detecting the rotation angle of the rotor of the motor and the rotation angle. It is characterized by having a torque current calculating means for calculating the corresponding current.

According to the present invention, since the current corresponding to the rotation torque can be acquired based on the rotation angle of the rotor of the motor, complicated control becomes unnecessary and the tension of the thread can be grasped more easily.

In the textile machine of the fifth invention, in the first to fourth inventions, whether the control unit has the first predetermined value acquired by the first rotation torque information acquisition process outside the first predetermined range. When it is determined by the first abnormality determination process for determining whether or not the condition is not the first abnormality determination process and the first predetermined value is out of the first predetermined range, the textile machine is notified that there is an abnormality. 1 It is characterized in that the notification process is further executed.

The first predetermined value is a value corresponding to the rotational torque of the roller when the thread is not wound around the roller. In the present invention, since it is possible to determine the presence or absence of an abnormality in the textile machine at a stage before winding the yarn based on the first predetermined value, it is possible to quickly grasp the abnormality in the textile machine.

In the textile machine of the sixth invention, in the first to fifth inventions, the control unit determines whether or not the tension-related value calculated by the yarn tension calculation process is out of the second predetermined range. When it is determined by the second abnormality determination process and the second abnormality determination process that the tension-related value is out of the second predetermined range, it is determined that the tension of the thread wound around the roller is abnormal. It is characterized in that the second notification process for notifying is further executed.

According to the present invention, the operator can surely grasp whether or not the tension of the thread wound around the roller is normal.

In the textile machine of the seventh invention, in the first to sixth inventions, the control unit determines whether or not the tension-related value calculated by the yarn tension calculation process is out of the second predetermined range. When it is determined by the second abnormality determination process and the second abnormality determination process that the tension-related value is out of the second predetermined range, the rotation drive unit adjusts the rotation torque generated in the roller. It is characterized by further executing the adjustment process.

According to the present invention, the tension of the yarn wound around the roller can always be made appropriate, and the quality of the yarn can be ensured in the textile machine.

In the textile machine of the eighth invention, in the first to seventh inventions, the control unit determines whether or not the tension-related value calculated by the yarn tension calculation process is out of the third predetermined range. The third abnormality determination process for determining, and the third notification process for notifying that the yarn is cut when the tension-related value is determined to be out of the third predetermined range by the third abnormality determination process. , Is further executed.

According to the present invention, the operator can surely and quickly grasp that the thread is cut.

In the textile machine of the ninth invention, in the first to eighth inventions, conversion information for converting the first predetermined value and the second predetermined value into the tension-related value is set in advance, and the control unit is the control unit. The yarn tension calculation process is characterized in that the tension-related value is calculated based on the conversion information.

According to the present invention, since the tension-related value can be calculated based on the conversion information set in advance, complicated calculation processing is not required, and the tension of the yarn can be grasped more easily.

The thread tension grasping method of the tenth invention is a thread tension grasping method for grasping the tension of the thread wound around the roller around which the traveling thread is wound around the peripheral surface, and is a rotation for generating rotational torque in the roller. A drive unit and a torque information acquisition means for acquiring a value corresponding to the rotation torque are provided, and a thread is wound around the roller by the torque information acquisition means while keeping the rotation speed of the roller constant at a predetermined speed. The first rotation torque information acquisition step of acquiring a first predetermined value corresponding to the first rotation torque generated in the roller when the roller is not used, and the torque information acquisition means in which the rotation speed of the roller is constant at the predetermined speed. A second rotational torque information acquisition step of acquiring a second predetermined value corresponding to a second rotational torque generated in the roller when the thread is wound around the roller, and the first predetermined value and the first predetermined value. 2. It is characterized by including a thread tension calculation step of calculating a tension-related value related to the tension of the thread wound around the roller based on a predetermined value.

According to the present invention, the tension-related value of the yarn can be calculated based on a predetermined value corresponding to the rotational torque when the yarn is wound around the roller and when the yarn is not wound, so that the tension-related value of the yarn can be calculated. There is no need to install a tension sensor to grasp the tension. As a result, in the textile machine, the tension of the yarn can be easily grasped at all times without deteriorating the quality of the yarn.

In the textile machine, the tension of the yarn can be easily detected at all times without deteriorating the quality of the yarn.

The schematic diagram which shows the spinning take-back machine provided with the spinning drawing apparatus which concerns on this embodiment. An enlarged view of the spinning and drawing apparatus of FIG. A block diagram schematically showing an electrical configuration of a godet roller and a motor connected to the godet roller. (A) A spinning and drawing device in which a thread is not wound around a godet roller in the first rotation torque information acquisition step, and (b) a state in which a thread is wound around a godet roller in the second rotation torque information acquisition process. The figure which shows the spinning and drawing apparatus of. It is a flowchart which shows the operation when the spinning and drawing apparatus which concerns on this embodiment grasps the tension of the yarn wound around a roller.

(Overall configuration of spinning take-up machine 1)
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In this embodiment, the spinning and drawing device 3 is adopted as the fiber machine. FIG. 1 is a schematic view showing a spinning take-up machine 1 provided with a spinning drawing device 3 according to the present embodiment. FIG. 2 is an enlarged view of the spinning and stretching device 3 of FIG. Hereinafter, the vertical direction of the paper surface in FIG. 1 will be referred to as the vertical direction, and the horizontal direction of the paper surface will be referred to as the horizontal direction. Further, the direction perpendicular to the paper surface of FIG. 1 is the front-back direction, and the front side of the paper surface is the front.

As shown in FIG. 1, the spinning taker 1 spins a plurality of (here, 6) yarns Y formed by solidifying a molten fiber material such as polyester continuously spun from the spinning apparatus 2. After stretching with the stretching device 3, the yarn winding device 4 winds the fibers.

The spinning device 2 continuously spins a molten fiber material such as polyester to generate a plurality of yarns Y. The plurality of yarns Y spun from the spinning device 2 are sent to the spinning and drawing device 3 via the guide roller 11 after the oil agent is applied by the oil agent guide 10.

The spinning and stretching device 3 is a device that heats and stretches a plurality of yarns Y, and is arranged below the spinning device 2. The spinning and drawing apparatus 3 has a plurality of (here, five) godet rollers 20 (20a to 20e) housed inside the heat insulating box 12. Hereinafter, the term "godet roller 20" is used when the five godet rollers 20a to 20e are not distinguished. As shown in FIG. 2, each of the godet rollers 20a to 20e is rotationally driven at a predetermined thread feed rate by a motor 30 described later (for the rotation direction, refer to the arrows of the godet rollers 20a to 20e in FIG. 2). Further, each of the godet rollers 20a to 20e is an induction heating roller that is induced to be heated by energizing the coil, and a plurality of threads Y are wound around the godet rollers 20a to 20e. An introduction port 12a for introducing a plurality of threads Y into the inside of the heat insulating box 12 is formed in the lower part of the right side surface portion of the heat insulating box 12, and a plurality of threads Y are kept warm in the upper part of the right side surface portion of the heat insulating box 12. A lead-out port 12b for leading out to the outside of the box 12 is formed. The plurality of threads Y are wound around the godet rollers 20a to 20e in order from the lower godet roller 20a at a winding angle of less than 360 degrees.

The lower three godet rollers 20a to 20c are preheating rollers for preheating a plurality of yarns Y before stretching, and the surface temperature of these rollers is a temperature equal to or higher than the glass transition point of the yarn Y (for example, 90 to 100 ° C.). Degree) is set. On the other hand, the upper two godet rollers 20d and 20e are tempering rollers for heat-setting a plurality of stretched yarns Y, and the surface temperature of these rollers is higher than the roller surface temperatures of the lower three godet rollers 20a to 20c. Is also set to a high temperature (for example, about 150 to 200 ° C.). Further, the thread feed speeds of the upper two godet rollers 20d and 20e are higher than those of the lower three godet rollers 20a to 20c.

The plurality of threads Y introduced into the heat insulating box 12 through the introduction port 12a are first preheated to a stretchable temperature while being fed by the godet rollers 20a to 20c. The plurality of preheated yarns Y are drawn by the difference in yarn feed rate between the godette roller 20c and the godette roller 20d. Further, the plurality of threads Y are heated to a higher temperature while being fed by the godet rollers 20d and 20e, and the stretched state is heat-set. The plurality of threads Y stretched in this way are led out of the heat insulating box 12 through the outlet 12b.

The plurality of yarns Y drawn by the spinning and drawing device 3 are sent to the thread winding device 4 via the guide roller 13. The thread winding device 4 is a device for winding a plurality of threads Y, and is arranged below the spinning and drawing device 3. The thread winding device 4 includes a bobbin holder 14, a contact roller 15, and the like. The bobbin holder 14 has a cylindrical shape extending in the front-rear direction, and is rotationally driven by a motor (not shown). The bobbin holder 14 is mounted with a plurality of bobbins B arranged side by side in the axial direction thereof. The thread winding device 4 winds a plurality of threads Y on a plurality of bobbins B at the same time by rotating the bobbin holder 14, and produces a plurality of packages P. The contact roller 15 contacts the surfaces of the plurality of packages P to apply a predetermined contact pressure to adjust the shape of the packages P.

Here, in order to appropriately perform the drawing process while maintaining the quality of the yarn Y in the spinning and drawing apparatus 3, it is necessary to grasp the tension of the yarn Y traveling between the godet rollers and manage the tension appropriately. There is. Conventionally, in order to grasp the tension of the yarn Y traveling in the yarn traveling direction, an operator has been measuring with a tension meter or installing a tension sensor. However, in the former case, since there are many points at which tension should be detected, it is troublesome for the operator to measure at each point, and it is not possible to perform constant measurement. Further, in the latter case, although it is possible to perform constant measurement, the tension sensor is generally a contact type, and the friction generated between the running yarn and the tension sensor deteriorates the quality of the yarn. There is a risk.

Therefore, in the spinning and drawing device 3 of the present embodiment, the motor 30 that rotationally drives the godet roller 20 and generates rotational torque in the godet roller 20, the motor controller 40 that controls the motor 30, and the rotors of the respective motors 30 It has a rotation angle detection circuit 50 (rotation angle detection means of the present invention) for detecting a rotation angle. The motor 30, the motor controller 40, and the rotation angle detection circuit 50 are provided in each of the godet rollers 20a to 20e. Hereinafter, description will be made with reference to FIG.

The motor 30 is a PM synchronous motor that uses a permanent magnet for the rotor. The motor 30 is connected to the godet roller 20 and the motor controller 40, and can generate rotational torque in the godet roller 20 in response to the current output from the motor controller 40.

The motor controller 40 includes an inverter 41 (output unit of the present invention) and a control unit 60. The inverter 41 is an AC inverter that converts direct current sent from a power source (not shown) into sinusoidal alternating current. The control unit 60 is a part that controls the magnitude and frequency of the alternating current output by the inverter 41. The rotational torque generated in the godet roller 20 is determined by the magnitude of the alternating current output by the inverter 41, and the rotational speed (that is, the thread feed speed) of the godet roller 20 rotationally driven by the motor 30 is determined by the frequency of the alternating current.

The rotation angle detection circuit 50 is connected to the motor 30 and the motor controller 40, and detects the rotation angle of the rotor of the motor 30 based on the current flowing through the motor 30. Information about the rotation angle of the rotor of the motor 30 detected by the rotation angle detection circuit 50 is sent to the control unit 60 of the motor controller 40.

Based on the rotation angle of the rotor and the current flowing through the motor 30, the control unit 60 calculates a current that generates a magnetic field in the rotor to drive the godette roller 20 to rotate and a current that generates a rotation torque. That is, in the present embodiment, the control unit 60 has a torque current calculating means.

Further, the control unit 60 controls the output of the inverter 41 based on the calculated current. More specifically, the control unit 60 performs so-called vector control in which the current for generating a magnetic field in the rotor and the current for generating a rotational torque are independently controlled. Further, the control unit 60 has a built-in memory (not shown) that stores an arbitrary rotational torque generated in each of the godet rollers 20a to 20e in association with a current for generating the rotational torque.

Subsequently, in the spinning and drawing apparatus 3 of the present embodiment, a method of calculating the tension-related value of the yarn Y wound around the godet rollers 20a to 20e will be described below with reference to FIGS. 4 and 5. In FIG. 4, only the Godet rollers 20c to 20e are shown in order to make the figure easier to see. The description of the godet rollers 20a and 20b is omitted.

(1st rotation torque information acquisition process)
First, as shown in FIG. 4A, in the control unit 60, the rotation speed of each of the godet rollers 20a to 20e becomes constant at a predetermined speed in a state where the thread Y is not wound around the godet rollers 20a to 20e. As described above, the frequency of the sinusoidal alternating current output from each of the inverters 41 is fixed at a predetermined value.

Here, when the godet rollers 20a to 20e are rotated, a load is applied to the godet rollers 20a to 20e due to wind loss due to the rotation of the rollers, friction loss in the bearing of the motor 30, and the like. Therefore, each motor 30 corresponds to each of the godet rollers 20a to 20e in order to keep the rotation speed of the godet rollers 20a to 20e under a load due to wind loss, friction loss, etc. constant at a predetermined speed. Generates a predetermined rotational torque. The rotational torque at this time is defined as the first rotational torque. The control unit 60 has a first current output to the motor 30 corresponding to the first rotation torque based on the rotation angle of the rotor of the motor 30 detected by the rotation angle detection circuit 50 for each of the godet rollers 20a to 20e. (First predetermined value) is acquired and stored in the memory (step S1).

(1st abnormality determination process)
The control unit 60 executes a first abnormality determination process for determining whether or not the first current acquired by the first rotation torque information acquisition process is out of the first predetermined range for each of the godet rollers 20a to 20e. (Step S2). The first predetermined range is the range of the current output to the motor 30 when the spinning and drawing device 3 is operating normally, and is set in advance by the operator in each of the godet rollers 20a to 20e, for example. Will be done.

(1st notification processing)
When it is determined by the first abnormality determination process that the first current corresponding to any of the godet rollers 20 is out of the first predetermined range (S2: YES), the control unit 60 has an abnormality in the spinning drawing device 3. The first notification process for notifying the operator of the existence is executed (step S3). Examples of the notification method include emitting a warning sound, displaying on a monitor or a warning light, and the like, but any other method that allows the operator to recognize that there is an abnormality in the spinning and drawing device 3. Anything can be used. Then, the control unit 60 stops the operation of the spinning and drawing device 3 after the first notification process is performed.

(2nd rotation torque information acquisition process)
When it is determined by the first abnormality determination process that the first current corresponding to all the godet rollers 20 is within the first predetermined range (S2: NO), as shown in FIG. 4B, the spinning apparatus 2 The yarn Y spun from the above is wound around each of the godet rollers 20a to 20e (step S4). The winding operation of the thread Y may be performed by an operator or may be performed automatically by a robot. Then, the control unit 60 is output from each inverter 41 so that the rotation speed of each of the godet rollers 20a to 20e becomes constant at a predetermined speed in a state where the thread Y is wound around each of the godet rollers 20a to 20e. The frequency of the sinusoidal alternating current is fixed at a predetermined value. The rotation speed of the godet rollers 20a to 20e at this time is the same as the rotation speed of the godet rollers 20a to 20e in the first rotation torque information acquisition step.

Here, in addition to the above-mentioned wind loss and friction loss, loads due to the tension of the thread Y are further applied to the godet rollers 20a to 20e in the state where the thread Y is wound. For example, demonstrating the godet roller 20d as an example, as shown in FIG. 4B, the godet roller 20d has a thread traveling direction (arrows in FIGS. 2 and 4) from the introduction port 12a to the outlet 12b rather than the godet roller 20d. The tension T1 of the thread Y on the upstream side of (see) and the tension T2 of the thread Y on the downstream side in the thread traveling direction with respect to the godet roller 20d are applied. Specifically, the tension T1 works in the direction opposite to the rotation direction of the godet roller 20d, and the tension T2 works in the same direction as the rotation direction of the godet roller 20d. That is, the godet roller 20d is further loaded due to the tension difference (T1-T2) between the tensions T1 and T2 of the yarn Y. Therefore, in order to keep the rotation speeds of the godet rollers 20a to 20e under the load due to the tension difference (T1-T2) in addition to the wind loss and the friction loss at a predetermined speed, each of the motors 30 is constant. A predetermined rotational torque corresponding to the load is generated in each of the godet rollers 20a to 20e. The rotational torque at this time is defined as the second rotational torque. The control unit 60 has a second current output to the motor 30 corresponding to the second rotation torque based on the rotation angle of the rotor of the motor 30 detected by the rotation angle detection circuit 50 for each of the godet rollers 20a to 20e. (Second predetermined value) is acquired and stored in the memory (step S5).

(Thread tension calculation process)
Subsequently, the control unit 60 determines the tension of the thread on the upstream side in the thread traveling direction of the godet rollers 20a to 20e and the godet roller 20e based on the difference between the first current and the second current stored in the memory. The tension difference (hereinafter, also simply referred to as “tension difference”) from the tension of the yarn Y on the downstream side in the yarn traveling direction from 20 is calculated (step S6).

Here, taking the godet roller 20d as an example again, the first current is a current corresponding to the first rotation torque generated by the motor 30 on the godet roller 20d to which a load is applied due to wind loss, friction loss, or the like. The second current is a current corresponding to the second rotation torque generated by the motor 30 on the godet roller 20d to which the load due to (T1-T2) is applied in addition to the wind loss, friction loss, and the like. That is, the difference between the first current and the second current corresponds to the difference between the first rotation torque and the second rotation torque, that is, corresponds to the tension difference (T1-T2). Therefore, for each of the godet rollers 20a to 20e, it is possible to calculate the tension difference (T1-T2) based on the difference between the first current and the second current.

As a specific procedure of the yarn tension calculation process, a conversion table for converting the difference between the first current and the second current into the tension difference is set in advance and stored in the memory of the control unit 60. Then, the control unit 60 obtains the tension difference of the yarn Y in each of the godet rollers 20a to 20e by converting the difference between the first current and the second current into the tension difference according to the conversion table.

The tension difference in the present embodiment is the "tension-related value of the thread wound around the roller" in the present invention.

(Second abnormality judgment processing)
The control unit 60 executes a second abnormality determination process for determining whether or not the tension difference of the thread Y in each of the godet rollers 20a to 20e acquired by the thread tension calculation process is outside the second predetermined range (step S7). ). The second predetermined range is an allowable range of the tension difference between the godet rollers 20a to 20e when the tension of the thread Y is appropriate, and is set in advance by the operator for each of the godet rollers 20a to 20e, for example. NS.

(Second notification processing)
When it is determined by the second abnormality determination process that the tension difference of the thread Y wound around any of the godet rollers 20 is out of the second predetermined range (S7: YES), the control unit 60 has a tension difference. A second notification process is executed to notify the operator that there is an abnormality in the tension of the thread Y wound around the godet roller 20 determined to be out of the second predetermined range (step S8). As the notification method, as in the first notification process, for example, a warning sound is emitted, a monitor or a warning light is displayed, and the like. In addition, any method may be used as long as the operator can recognize that the tension of the thread Y wound around the godet roller 20 is abnormal.

(Third abnormality judgment processing)
Subsequently, the control unit 60 adjusts the rotational torque generated in the godet roller 20 by the motor 30 and the inverter 41 so that the tension difference of the threads Y wound around all the godet rollers 20 is within the second predetermined range. The adjustment process is executed (step S11 described later). However, if the yarn Y is cut at any part of the spinning take-up machine 1, the adjusting step cannot deal with it. Therefore, before performing the adjustment process, the control unit 60 first executes a third abnormality determination process for determining whether or not the tension difference of the thread Y in each of the godet rollers 20a to 20e is outside the third predetermined range. (Step S9). The third predetermined range is a range larger than the second predetermined range in the second abnormality determination process (S7), and the tension difference between the godet rollers 20a to 20e when the thread Y is not cut. It is an acceptable range. The third predetermined range is set in advance for each of the godet rollers 20a to 20e by, for example, an operator.

(Third notification processing)
When it is determined by the third abnormality determination process that the tension difference of the yarn Y wound around any of the godet rollers 20 is out of the third predetermined range (S9: YES), the control unit 60 is the spinning taker. A third notification process for notifying the operator that the thread Y is cut at any of the points 1 is executed (step S10). Similar to the first notification process and the second notification process, the notification method includes, for example, emitting a warning sound, displaying on a monitor or a warning light, and the like. In addition, any method may be used as long as the operator can recognize that the tension of the thread Y wound around the godet roller 20 is abnormal. However, it is preferable that the second notification process and the third notification process can be distinguished from each other. For example, when a warning sound is emitted in the second notification processing and the third notification processing, it is preferable that the warning sound in the second notification processing and the warning sound in the third notification processing are different. As a result, the operator can easily determine whether the warning sound is due to the second notification process or the third notification process. Then, the control unit 60 stops the operation of the spinning and drawing device 3 after the third notification process is performed. It goes without saying that it is preferable that the display method is different between the second notification process and the third notification process in the case of visual confirmation such as displaying on a monitor or a warning light.

(Adjustment process)
When it is determined by the third abnormality determination process that the tension difference of the yarn Y wound around all the godet rollers 20 is within the third predetermined range (S9: NO), the control unit 60 spins the yarn Y. It is determined that the pick-up machine 1 is not cut at any place. Then, the control unit 60 uses the motor 30 and the inverter 40 to make any of the godet rollers 20a to 20e so that the tension difference of the threads Y wound around all the godet rollers 20 is within the second predetermined range. An adjustment process for adjusting the rotational torque generated in the godet roller 20 is executed (step S11). After that, the control unit 60 returns to step S5 and executes the second rotation torque information acquisition process again.

When it is determined by the second abnormality determination process that the tension difference of the yarn Y wound around all the godet rollers 20 is within the second predetermined range (S7: NO), the control unit 60 is the spinning and drawing device 3. It is determined whether or not the winding of the thread Y is completed by the thread winding device 4 arranged below the above (step S12). That is, the control unit 60 of the spinning and drawing device 3 is connected to the thread winding device 4.

When it is determined that the winding of the thread Y by the thread winding device 4 is not completed (S12: NO), the control unit 60 returns to step S5 and executes the second rotation torque information acquisition process again. When it is determined that the winding of the yarn Y by the spool winding device 4 is completed (S12: YES), the operation of the spinning and drawing device 3 is terminated.

In the present embodiment, after the yarn Y spun from the spinning apparatus 2 is wound around the godet rollers 20a to 20e of the spinning drawing apparatus 3 in step S4, the yarn Y is produced and processed by the spinning taker 1, that is, spinning. The stretching process by the stretching device 3 and the production of the package P by the thread winding device 4 are performed. Therefore, in the present embodiment, in the process of producing and processing the yarn Y, the tension difference of the yarn Y wound around the godet roller 20 is constantly measured and adjusted so as to be an appropriate value.

(effect)
In the spinning and drawing device 3 of the present embodiment, the godet rollers 20a to 20e around which the traveling thread Y is wound around the peripheral surface, the inverter 41 that outputs the current, and the godet roller 20a that obtains the rotational torque corresponding to the current output from the inverter 41. A motor 30 generated in ~ 20e, a rotation angle detection circuit 50 that detects the rotation angle of the rotor of the motor 30, and a torque current calculation means that calculates a current corresponding to the rotation torque based on the rotation angle of the rotor. The control unit 60 is provided. Then, the control unit 60 sets the rotational speeds of the godet rollers 20a to 20e to be constant at predetermined speeds, and sets the first current corresponding to the first rotational torque generated in the godet rollers 20 when the thread Y is not wound around the godet rollers 20. The first rotational torque information acquisition process for acquiring The tension related to the tension of the thread Y wound around the godet rollers 20a to 20e based on the second rotation torque information acquisition process for acquiring the second current corresponding to the above and the difference between the first current and the second current. The thread tension calculation process for calculating the related value is executed.

According to the present embodiment, the first current and the second current corresponding to the first rotation torque and the second rotation torque when the thread Y is wound around the godet roller 20 and when the thread Y is not wound are Since the tension-related value of the thread Y can be calculated based on the difference, it is not necessary to install a tension sensor to grasp the tension of the thread Y. As a result, in the spinning and drawing apparatus 3, the tension of the yarn Y can be easily grasped at all times without deteriorating the quality of the yarn Y. Further, since the tension-related value of the thread Y can be calculated based on the current flowing through the motor 30 when the rotational torque is generated in each of the godet rollers 20a to 20e, the tension of the thread Y can be calculated as compared with the case where the tension of the thread Y is directly detected. Therefore, the tension of the thread Y can be easily grasped. Further, since the current corresponding to the rotation torque can be acquired based on the rotation angle of the rotor of the motor 30, complicated control becomes unnecessary, and the tension of the thread Y can be grasped more easily.

In the spinning and drawing device 3 of the present embodiment, the tension-related values of the yarn Y are the tension of the yarn Y on the upstream side in the yarn traveling direction from the godet rollers 20a to 20e and the tension on the downstream side in the yarn traveling direction from the godet rollers 20a to 20e. It is a value of the tension difference from the tension of the thread Y. The tension difference between the tension of the thread Y on the upstream side in the thread traveling direction and the tension of the thread Y on the downstream side in the thread traveling direction with respect to the godet roller 20 is the characteristic of the godet roller 20 (for example, the magnitude of the rotation speed and the rotation torque). It is determined in advance depending on the type of thread Y to be wound and the like. According to the present embodiment, it is possible to easily determine whether or not the tension of the yarn Y is appropriate by comparing the tension difference calculated in the yarn tension calculation process with the predetermined tension difference.

In the spinning and drawing device 3 of the present embodiment, the control unit 60 has a first abnormality determination process for determining whether or not the first current acquired in the first rotation torque information acquisition process is out of the first predetermined range. When it is determined by the first abnormality determination process that the first current is out of the first predetermined range, the first notification process for notifying that there is an abnormality in the spinning and drawing device 3 is further executed. The first current is a current corresponding to the rotational torque of each of the godet rollers 20a to 20e when the thread Y is not wound around the godet roller 20. In the present embodiment, since the abnormality of the spinning / drawing apparatus 3 can be determined at the stage before the yarn Y is wound based on the first current, the abnormality of the spinning / drawing apparatus 3 can be quickly grasped.

In the spinning and drawing device 3 of the present embodiment, the control unit 60 determines whether or not the tension difference (tension-related value) calculated by the yarn tension calculation process is outside the second predetermined range. When it is determined by the second abnormality determination process that the tension difference is out of the second predetermined range, the second notification process and the motor notify that the tension of the thread Y wound around the godet roller 20 is abnormal. The adjustment process of adjusting the rotational torque generated in the godet roller 20 by 30 is further executed. According to this embodiment, the operator can surely grasp whether or not the tension of the thread Y wound around the godet rollers 20a to 20e is normal. Further, the tension of the yarn Y wound around the godette roller 20 can always be made appropriate, and the quality of the yarn Y can be ensured in the spinning and drawing apparatus 3.

In the spinning and drawing device 3 of the present embodiment, the control unit 60 determines whether or not the tension difference (tension-related value) calculated by the yarn tension calculation process is outside the third predetermined range. And, when it is determined by the third abnormality determination process that the tension difference is out of the third predetermined range, the third notification process for notifying that the thread Y is cut is further executed. According to this embodiment, the operator can surely and quickly grasp that the thread Y is cut.

In the spinning and drawing apparatus 3 of the present embodiment, a conversion table for converting the difference between the first current and the second current into the tension difference (tension-related value) of the yarn Y is set in advance, and the control unit 60 performs the yarn tension calculation process. In, the tension difference is calculated based on the conversion table. According to the present embodiment, since the tension difference can be calculated based on a preset conversion table, complicated calculation processing is not required, and the tension of the yarn can be grasped more easily.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these examples, and various modifications can be made as long as they are described in the claims. Hereinafter, a modified example in which the embodiment is modified will be described. However, those having the same configuration as that of the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted as appropriate.

(Modification example)
In the above embodiment, the first predetermined value and the second predetermined value are the first current and the second current output to the motor 30, respectively. However, the first predetermined value and the second predetermined value may be a voltage, a rotational torque itself, or other values. In either case, the first predetermined value and the second predetermined value are stored in the memory built in the control unit 60.

In the above embodiment, the rollers are a plurality of godet rollers 20a to 20e housed inside the heat insulating box 12 of the spinning and drawing device 3, and each of the godet rollers 20a to 20e has the configuration of the present invention. However, of the plurality of godet rollers 20a to 20e, only a part of the godet rollers may have the configuration of the present invention. In this case, the control unit 60 has the first rotation torque information acquisition process, the second rotation torque information acquisition process, the thread tension calculation process, and the first to third abnormality determination processes for the godet roller that does not have the configuration of the present invention. , 1st to 3rd notification processing, adjustment processing, etc. are not executed. Further, the number of godet rollers is not limited to a plurality, and may be one. In this case, one godet roller has the configuration of the present invention.

In the above embodiment, the control unit 60 acquires a first current (first predetermined value) and a second current (second predetermined value) for each of the godet rollers 20a to 20e. However, the control unit 60 may acquire the first current and the second current only for one of the plurality of godet rollers 20a to 20e. In this case, the first current and the second current of the other godet rollers are relatively acquired and stored in the memory with reference to the first current and the second current of the one godet roller acquired as the measured values. For example, the control unit 60 first acquires the first current output to the motor 30 corresponding to the first rotation torque of the godet roller 20a and stores it in the memory. Subsequently, the control unit 60 relatives the first current output to the motor 30 in response to the first rotation torque of the other godet rollers 20b to 20e with reference to the first current of the godet roller 20a stored in the memory. Each is acquired and stored in the memory. The same applies to the second current. As a result, the first rotation torque information acquisition process and the second rotation torque information acquisition process are easily and quickly executed as compared with the case where the first predetermined value and the second predetermined value are individually acquired for each of the godet rollers 20a to 20e. can do.

Further, in the above embodiment, the first predetermined range, the second predetermined range, and the third predetermined range are set in the godet rollers 20a to 20e, respectively. However, the first predetermined range, the second predetermined range, and the third predetermined range may be set only for one of the plurality of godet rollers 20a to 20e. In this case, based on the upper and lower limit values of the first predetermined range, the second predetermined range and the third predetermined range of the one Godet roller, the first predetermined range and the second predetermined range of the other Godet rollers are used as a reference. The upper limit value and the lower limit value of the range and the third predetermined range are relatively set respectively.

In the above embodiment, the textile machine is a spinning and drawing device 3. However, the textile machine may be, for example, a false twisting machine. In this case, the roller is a feed roller. The feed roller has, for example, a drive roller and a driven roller, and has a configuration in which the drive roller is rotationally driven in a state where the thread is sandwiched between the drive roller and the driven roller to feed the thread in the thread traveling direction. .. Therefore, more specifically, the roller is a drive roller among the feed rollers. Further, the roller may be a godet roller other than the spinning drawing device 3 in the spinning take-up machine 1.

In the above embodiment, the motor 30 is a PM synchronous motor. However, the motor 30 may be a DC brush motor. In this case, the inverter 41 is a DC inverter because the current flowing through the motor 30 must be direct current. Further, in this case, both the rotational torque and the rotational speed of the godet roller 20 are determined by the magnitude of the current controlled by the DC inverter 41. Therefore, the control unit 60 does not perform vector control, but integrally controls the current that generates a magnetic field in the rotor and the current that generates rotational torque.

In the above embodiment, the control unit 60 converts the difference between the first current and the second current into the tension difference of the thread Y in the godet roller 20 according to a preset conversion table. However, a conversion formula for converting the difference between the first current and the second current into the tension difference of the thread Y may be set in advance. In this case, the tension difference of the thread Y is calculated by substituting the difference between the first current and the second current into the conversion formula.

In the above embodiment, the "tension-related value related to the tension of the thread wound around the roller" refers to the tension of the thread Y on the upstream side in the thread traveling direction of the Godet roller 20 and the thread on the downstream side in the thread traveling direction. It is the tension difference from the tension of Y. However, the "tension-related value" may be, for example, the tension of the thread Y wound around the godet roller 20 itself, the tension of the thread Y on the upstream side of the godet roller 20 in the thread traveling direction, and the downstream of the thread traveling direction. It may be the ratio with the tension of the thread Y on the side. What kind of tension-related value is adopted is appropriately set by the user.

Further, in the above embodiment, the control unit 60 calculates the tension-related value of the yarn Y based on the difference between the first current and the second current in the yarn tension calculation process. However, the control unit 60 may calculate the tension-related value of the thread Y based on the ratio of the first current to the second current. Further, the control unit 60 may calculate the tension-related value of the thread Y by performing a predetermined arithmetic process on the first current and the second current.

In the above embodiment, the rotation angle detection circuit 50 is provided. However, instead of the rotation angle detection circuit, a position sensor for detecting the position of the rotor of the motor 30 such as an optical encoder or a resolver, or a sensor for detecting the magnetic pole position of the rotor of the motor 30 may be provided. .. In this case, the sensor is connected to the motor 30 and the motor controller 40, and the position information of the rotor of the motor 30 detected by the sensor is sent to the control unit 60.

In the above embodiment, the control unit 60 stops the operation of the spinning and drawing device 3 after executing the first notification process and the third notification process. However, the control unit 60 may stop the operation of the spinning and drawing device 3 while the first notification process and the third notification process are being performed, and the spinning unit 60 spins at the same time as the execution of the first notification process and the third notification process. The operation of the stretching device 3 may be stopped.

In the above embodiment, the third abnormality determination process is performed after the second notification process is performed. However, the third abnormality determination process may be performed before the second abnormality determination process. In this case, the control unit 60 executes the third abnormality determination process after the thread tension calculation process is performed. Then, when it is determined by the third abnormality determination process that the tension difference of the threads Y wound around all the godet rollers 20 is within the third predetermined range, the control unit 60 further performs the second abnormality determination process. To execute. Even in this case, the third predetermined range is a range larger than the second predetermined range in the second abnormality determination process.

Further, the third abnormality determination process may not be performed. In this case, when it is determined by the second abnormality determination process that the tension difference of the thread Y wound around any of the godet rollers 20 is out of the second predetermined range, the control unit 60 performs the second notification process. Perform adjustment processing. Further, the control unit 60 may execute only one of the second notification process and the adjustment process. For example, when the adjustment process is not executed, the control unit 60 stops the operation of the spinning and drawing device 3 after executing the second notification process.

Further, only the third abnormality determination process may be performed. In this case, when it is determined by the third abnormality determination process that the tension difference of the yarn Y wound around all the godet rollers 20 is within the third predetermined range, the control unit 60 of the spinning and drawing device 3 It is determined whether or not the winding of the thread Y is completed by the thread winding device 4 arranged below. Further, in this case, the tension difference of the yarn Y calculated by the yarn tension calculation process is confirmed by, for example, an operator. Then, when the tension difference of the yarn Y is within the third predetermined range but is not an appropriate value, the control unit 60 stops the operation of the spinning and drawing device 3 based on the input signal from the operator.

1 Spinning taker 3 Spinning drawing device (fiber machine)
20 Godet roller 30 Motor 40 Motor controller 41 Inverter (output section)
50 Rotation angle detection circuit (rotation angle detection means)
60 Control unit

The textile machine of the first invention includes a roller capable of winding a traveling thread around a peripheral surface, a rotary drive unit that generates a rotational torque on the roller, and a torque that acquires a value corresponding to the rotational torque. The control unit includes an information acquisition means and a control unit, and the control unit keeps the rotation speed of the roller constant at a predetermined speed, and the roller is not wound around the roller by the torque information acquisition means. The first rotation torque information acquisition process for acquiring the first predetermined value corresponding to the first rotation torque generated in the above, and the torque information acquisition means with the rotation speed of the roller being constant at the predetermined speed Based on the second rotation torque information acquisition process for acquiring the second predetermined value corresponding to the second rotation torque generated in the roller when the roller is wound, and the first predetermined value and the second predetermined value. It is characterized by executing a thread tension calculation process for calculating a tension-related value related to the tension of the thread wound around the roller.

The thread tension grasping method of the tenth invention is a thread tension grasping method for grasping the tension of a thread wound around a roller capable of winding a traveling thread on a peripheral surface in a textile machine, and the fiber. The machine includes a rotation drive unit that generates rotational torque in the roller and torque information acquisition means that acquires a value corresponding to the rotational torque, and the torque information is assumed that the rotational speed of the roller is constant at a predetermined speed. The first rotation torque information acquisition step of acquiring the first predetermined value corresponding to the first rotation torque generated in the roller when the thread is not wound around the roller by the acquisition means, and the rotation speed of the roller. Second rotation torque information that acquires a second predetermined value corresponding to the second rotation torque generated in the roller when the thread is wound around the roller by the torque information acquisition means, assuming that the speed is constant. It is characterized by including an acquisition step and a thread tension calculation step of calculating a tension-related value related to the tension of the thread wound around the roller based on the first predetermined value and the second predetermined value. Is to be.

(Third abnormality judgment processing)
Subsequently, the control unit 60 adjusts the rotational torque generated in the godet roller 20 by the motor 30 and the inverter 41 so that the tension difference of the threads Y wound around all the godet rollers 20 is within the second predetermined range. The adjustment process is executed (step S11 described later). However, if the yarn Y is cut at any part of the spinning take-up machine 1, the adjusting step cannot deal with it. Therefore, before performing the adjustment process, the control unit 60 first tension difference of the yarn Y in the respective godet rollers 20a~20e is running a third abnormality determination process to determine whether the third is outside the predetermined range (Step S9). The third predetermined range is a range larger than the second predetermined range in the second abnormality determination process (S7), and the tension difference between the godet rollers 20a to 20e when the thread Y is not cut. It is an acceptable range. The third predetermined range is set in advance for each of the godet rollers 20a to 20e by, for example, an operator.

(effect)
The spinning and drawing device 3 of the present embodiment includes a godet rollers 20a to 20e capable of winding a traveling thread Y around a peripheral surface, an inverter 41 that outputs a current, and a rotation corresponding to the current output from the inverter 41. The motor 30 that generates torque in the godet rollers 20a to 20e, the rotation angle detection circuit 50 that detects the rotation angle of the rotor of the motor 30, and the torque that calculates the current corresponding to the rotation torque based on the rotation angle of the rotor. A control unit 60 having a current calculating means is provided. Then, the control unit 60 sets the rotational speeds of the godet rollers 20a to 20e to be constant at predetermined speeds, and sets the first current corresponding to the first rotational torque generated in the godet rollers 20 when the thread Y is not wound around the godet rollers 20. The first rotational torque information acquisition process for acquiring The tension related to the tension of the thread Y wound around the godet rollers 20a to 20e based on the second rotation torque information acquisition process for acquiring the second current corresponding to the above and the difference between the first current and the second current. The thread tension calculation process for calculating the related value is executed.

Claims (10)

A roller around which the running thread is wound around the peripheral surface,
A rotary drive unit that generates rotational torque in the rollers,
Torque information acquisition means for acquiring a value corresponding to the rotational torque, and
With a control unit
The control unit
Assuming that the rotation speed of the roller is constant at a predetermined speed, the torque information acquisition means acquires a first predetermined value corresponding to the first rotation torque generated in the roller when the thread is not wound around the roller. 1st rotation torque information acquisition processing and
Assuming that the rotation speed of the roller is constant at the predetermined speed, the torque information acquisition means acquires a second predetermined value corresponding to the second rotation torque generated in the roller when the thread is wound around the roller. 2nd rotation torque information acquisition processing and
A fiber characterized by executing a yarn tension calculation process of calculating a tension-related value related to the tension of a yarn wound around the roller based on the first predetermined value and the second predetermined value. machine. The tension-related value is a value of the tension difference between the tension of the yarn on the upstream side in the yarn traveling direction in which the yarn travels from the roller and the tension of the yarn on the downstream side in the yarn traveling direction from the roller. The textile machine according to claim 1. The rotation drive unit has an output unit that outputs a current and a motor that generates a rotation torque corresponding to the current output from the output unit.
The control unit
In the first rotation torque information acquisition process, the first current is acquired as the first predetermined value, and the first current is acquired.
In the second rotation torque information acquisition process, the second current is acquired as the second predetermined value, and the second current is acquired.
The textile machine according to claim 1 or 2, wherein in the yarn tension calculation process, the tension-related value is calculated based on the first current and the second current. The torque information acquisition means includes a rotation angle detecting means for detecting the rotation angle of the rotor of the motor and a torque current calculating means for calculating a current corresponding to the rotation torque based on the rotation angle. The textile machine according to claim 3. The control unit
The first abnormality determination process for determining whether or not the first predetermined value acquired by the first rotation torque information acquisition process is outside the first predetermined range, and the first abnormality determination process.
When it is determined by the first abnormality determination process that the first predetermined value is out of the first predetermined range, the first notification process for notifying that there is an abnormality in the textile machine is further executed. The textile machine according to any one of claims 1 to 4. The control unit
A second abnormality determination process for determining whether or not the tension-related value calculated by the thread tension calculation process is outside the second predetermined range, and a second abnormality determination process.
When it is determined by the second abnormality determination process that the tension-related value is out of the second predetermined range, the second notification process for notifying that there is an abnormality in the tension of the thread wound around the roller, and the second notification process. The textile machine according to any one of claims 1 to 5, wherein the textile machine is further performed. The control unit
A second abnormality determination process for determining whether or not the tension-related value calculated by the thread tension calculation process is outside the second predetermined range, and a second abnormality determination process.
When it is determined by the second abnormality determination process that the tension-related value is out of the second predetermined range, the adjustment process for adjusting the rotational torque generated in the roller by the rotary drive unit is further executed. The textile machine according to any one of claims 1 to 6, wherein the textile machine is characterized in that. The control unit
A third abnormality determination process for determining whether or not the tension-related value calculated by the thread tension calculation process is outside the third predetermined range, and a third abnormality determination process.
When it is determined by the third abnormality determination process that the tension-related value is out of the third predetermined range, the third notification process for notifying that the yarn is cut is further executed. The textile machine according to any one of claims 1 to 7. Conversion information for converting the first predetermined value and the second predetermined value into the tension-related value is set in advance.
The control unit
The textile machine according to any one of claims 1 to 8, wherein in the yarn tension calculation process, the tension-related value is calculated based on the conversion information. It is a thread tension grasping method for grasping the tension of the thread wound around the roller around which the traveling thread is wound around the peripheral surface.
A rotary drive unit that generates rotational torque in the rollers,
Torque information acquisition means for acquiring a value corresponding to the rotational torque, and
With
Assuming that the rotation speed of the roller is constant at a predetermined speed, the torque information acquisition means acquires a first predetermined value corresponding to the first rotation torque generated in the roller when the thread is not wound around the roller. 1st rotation torque information acquisition process and
Assuming that the rotation speed of the roller is constant at the predetermined speed, the torque information acquisition means acquires a second predetermined value corresponding to the second rotation torque generated in the roller when the thread is wound around the roller. 2nd rotation torque information acquisition process and
A yarn tension including a yarn tension calculation step of calculating a tension-related value related to the tension of the yarn wound around the roller based on the first predetermined value and the second predetermined value. How to grasp.

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