JP2022030632A - Yarn winder - Google Patents

Abstract

To provide a yarn winder capable of effectively suppressing variation in tension caused by reciprocation of a traverse guide.SOLUTION: A rewinder 1 has a traverse device 23 having a traverse guide 33 for traversing a running yarn Y in the axial direction of a winding bobbin Bw, a tension imparting part (a winding part 13 and a yarn feeding part 14) for imparting tension to a yarn Y taken up on the winding bobbin Bw, and a control device 15. The control device 15 comprises a prediction information acquisition unit (traverse control unit 53) for acquiring prediction information regarding at least one of a prediction position and prediction speed of the traverse guide 33 in future, and a tension adjustment unit (roller control unit 54) for controlling the yarn feeding part 14 on the basis of adjustment information (rotation speed information) relating to adjustment of the tension. The roller control unit 54 acquires rotation speed adjustment information corresponding to time t1 in association with prediction information corresponding to time t2 after a prescribed time dt from the time t1.SELECTED DRAWING: Figure 8

Description

The present invention relates to a bobbin winder.

Patent Document 1 discloses a thread winder that winds a running thread on a bobbin to form a package. More specifically, the thread take-up machine is a traverse device having a traverse guide for traversing the thread along the axial direction of the bobbin, a take-up section for rotating the bobbin, and a roller (feed) for sending the thread to the take-up section. Roller) and. Tension is applied to the yarn by the speed difference between the winding speed at which the yarn is wound on the bobbin and the yarn feeding speed at which the yarn is fed by the feed roller (in other words, the yarn winder applies the yarn to the bobbin. A tension applying portion for applying tension is provided). By controlling such tension to a predetermined value, a package having a predetermined winding density according to the application is formed.

Here, the tension actually applied to the yarn may fluctuate due to the reciprocating movement of the traverse guide. For example, when the traverse guide is directed from the center to the end in a given traverse direction, the tension is unintentionally increased due to the lengthening of the thread path and the pulling of the thread outward in the traverse direction by the traverse guide. Can be done. In addition, when the direction of travel of the traverse guide is switched from the outside to the inside in the traverse direction, the tension is unintentional due to the shortening of the thread path and the temporary loosening of the thread tension by the traverse guide. Can decrease. Such fluctuations in tension can be suppressed by, for example, controlling the thread feed rate by a control device (tension adjusting unit) such as a computer. For example, Patent Document 2 proposes a means for controlling the thread feed rate by using information on the position of the traverse guide.

WO2020075383A1 EP1318097B1

There is a certain time lag (delay) between the time when the tension adjusting unit acquires the tension adjusting information considering the position (and / or speed) of the traverse guide and the time when the tension is actually adjusted. The time lag is caused by, for example, the time required for arithmetic processing by the tension adjusting unit, the time required for the reaction of the tension applying unit, and the like. Due to such a delay, for example, when the traverse cycle is short (the movement of the traverse guide is quick), the actual tension adjustment may not sufficiently follow the change in tension caused by the movement of the traverse guide. .. This can lead to the problem that the fluctuation of tension cannot be sufficiently suppressed. Patent Documents 1 and 2 do not describe the time lag as described above.

An object of the present invention is to effectively suppress fluctuations in tension caused by the reciprocating movement of the traverse guide.

The thread winder of the first invention is a thread winder that winds a running thread on a bobbin, and has a traverse device having a traverse guide for traversing the thread along the axial direction of the bobbin. A tension applying unit that applies tension to the thread wound around the bobbin and a control unit are provided, and the control unit acquires prediction information regarding at least one of a future predicted position and a predicted speed of the traverse guide. It has a prediction information acquisition unit and a tension adjusting unit that controls the tension applying unit based on the adjustment information related to the tension adjustment, and the tension adjusting unit has the adjustment information corresponding to a predetermined first time. Is obtained in association with the prediction information corresponding to the second time after a predetermined time from the first time.

In the present invention, the adjustment information corresponding to a certain first time is acquired in association with the prediction information corresponding to the second time after a predetermined time after the first time (that is, in the future by a predetermined time). "Acquiring in association with each other" means that there is some relationship (calculation, stringing, etc.) between the adjustment information corresponding to the first time and the prediction information corresponding to the second time. The predetermined time can be set or determined in consideration of the above-mentioned time lag (delay).

As a result, the tension adjusting unit can output a signal relating to the tension adjusting that should actually be performed at the second time by a predetermined time earlier than the second time. Therefore, the delay can be compensated and the tension can be adjusted at an appropriate timing. Therefore, it is possible to effectively suppress the fluctuation of tension caused by the reciprocating movement of the traverse guide.

The spool of the second invention is characterized in that, in the first invention, the predetermined time is shorter than the reciprocating cycle of the traverse guide.

In the present invention, the predetermined time is as short as less than the reciprocating cycle of the traverse guide. Therefore, the error between the predicted position and / or the predicted speed of the traverse guide corresponding to the second time predicted at the first time and the actual position and / or speed of the traverse guide at the second time becomes large. Can be suppressed. Therefore, the tension can be controlled with high accuracy.

The thread winder of the third invention includes a tension detecting unit for detecting the tension applied to the yarn in the first or second invention, and the tension adjusting unit is a detection result by the tension detecting unit. It is characterized in that the adjustment information is acquired based on the above.

Thread tension can vary not only due to the reciprocating movement of the traverse guide, but also due to other disturbance factors. In the present invention, by acquiring the adjustment information based on the detection result by the tension detecting unit, the feedback control can be performed so that the tension approaches a predetermined target value. Therefore, tension fluctuations due to disturbance factors other than the reciprocating movement of the traverse guide can be suppressed, and the tension can be further stabilized.

In the thread winder of the fourth invention, in any one of the first to third inventions, the tension applying unit is a winding unit that winds a thread on the bobbin and a thread feeder that feeds the thread to the bobbin. The tension on the yarn is due to the speed difference between the winding speed at which the yarn is wound on the bobbin by the winding portion and the yarn feeding speed at which the yarn is sent to the bobbin by the yarn feeding portion. The tension adjusting unit is characterized in that the tension is adjusted by controlling the thread feed unit.

In a configuration in which tension is applied to the yarn by the speed difference between the winding speed and the yarn feeding speed, it is also possible to control the tension by controlling the winding speed. However, if the tension is controlled by controlling the take-up speed, the take-up angle (twill angle) of the yarn may unintentionally fluctuate. In such a case, it becomes necessary to control the traverse device in order to suppress the fluctuation of the twill angle, which may complicate the control. In the present invention, since the tension is controlled by controlling the yarn feed rate, the control can be simplified as compared with the case where the winding unit is controlled to control the tension.

The thread winder of the fifth invention is characterized in that, in any one of the first to fourth inventions, the control unit changes the target value of the tension within the reciprocating cycle of the traverse guide.

In a configuration in which the target value of tension is changed within the reciprocating cycle of the traverse guide, the control of the present invention that suppresses the fluctuation of tension in consideration of the above-mentioned time lag is particularly effective.

In the fifth invention, the control unit sets the target value when the traverse guide is located at the end of the traverse direction in which the traverse guide moves, and the traverse guide. Is characterized by being lower than the target value when is located in the center.

If the tension of the thread is high when the traverse guide is located at the end of the traverse direction, the thread may be unintentionally pulled inward in the axial direction of the bobbin when the traverse guide is turned. As a result, in the axial direction of the bobbin, the amount of yarn wound inward from the target position increases, and the shape of the package may be deformed. In the present invention, the tension when the traverse guide is located at the end in the traverse direction can be reduced. Therefore, it is possible to prevent the thread from being unintentionally pulled inward in the axial direction of the bobbin when the direction of the traverse guide is changed.

It is a schematic diagram which looked at the rewinder which concerns on this embodiment from the front. It is a figure which shows the electric composition of a rewinder. It is a graph which shows the relationship between the position and time of a traverse guide, and the graph which shows the relationship between the speed and time of a traverse guide. This is the first reference example of the graph showing the relationship between the position of the traverse guide, the rotation speed of the feed roller, the tension of the thread, and the time. This is the second reference example of the graph showing the relationship between the position of the traverse guide, the rotation speed of the feed roller, the tension of the thread, and the time. It is a table explaining the correspondence between the predicted position and the predicted speed of the traverse guide and the time. It is a table explaining the relationship between the predicted position of the traverse guide at a certain time and the actual rotation speed of the feed roller. It is a table which shows the relationship between the rotation speed command value of a feed roller, and a time in consideration of a predetermined time lag. It is a graph which shows the relationship between the position of the traverse guide which concerns on this embodiment, the rotation speed of a feed roller, the tension of a thread, and time. It is a graph which shows the relationship between the position of the traverse guide which concerns on the modification, the rotation speed of a feed roller, the tension of a thread, and time.

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 9. The vertical direction and the horizontal direction shown in FIG. 1 are the vertical direction and the horizontal direction of the rewinder 1, respectively. The direction orthogonal to both the vertical direction and the horizontal direction (the vertical direction on the paper surface in FIG. 1) is defined as the front-back direction. The traveling direction of the thread Y is defined as the thread traveling direction.

(Composition of rewinder)
First, the configuration of the rewinder 1 (thread winder of the present invention) according to the present embodiment will be described with reference to FIG. 1. FIG. 1 is a schematic view of the rewinder 1 as viewed from the front. As shown in FIG. 1, the rewinder 1 includes a machine base 11, a thread feeding section 12, a winding section 13, a thread feeding section 14, and a control device 15 (control section of the present invention). The rewinder 1 unwinds the yarn Y from the yarn feeding package Ps supported by the yarn feeding portion 12 and rewinds the yarn Y to the winding bobbin Bw (bobbin of the present invention) by the winding unit 13 to form the winding package Pw. It is configured to do. More specifically, the rewinder 1 is for, for example, rewinding the yarn Y wound around the yarn feeding package Ps more cleanly, or forming a winding package Pw having a desired density.

The machine base 11 is provided so as to extend in the vertical direction. The machine base 11 is erected on a floor surface (not shown), for example. A thread feeding section 12 is provided on the lower portion of the machine base 11. A take-up portion 13 is provided on the upper portion of the machine base 11. A thread feeding portion 14 is provided at an intermediate portion in the vertical direction of the machine base 11.

The thread feeding section 12 is provided on the lower portion of the machine base 11. The thread feeding section 12 is configured to support the thread feeding package Ps formed by winding the thread Y around the thread feeding bobbin Bs. As a result, the yarn feeding unit 12 can supply the yarn Y.

The take-up unit 13 is configured to take up the thread Y on the take-up bobbin Bw to form a take-up package Pw. The take-up portion 13 is provided on the upper portion of the machine base 11. The take-up unit 13 has a cradle arm 21, a take-up motor 22, a traverse device 23, and a contact roller 24.

The cradle arm 21 is swingably attached to, for example, the machine base 11. The cradle arm 21 is configured to rotatably support the winding bobbin Bw, for example, with the left-right direction as the axial direction of the winding bobbin Bw. For example, a bobbin holder (not shown) for gripping the take-up bobbin Bw is rotatably attached to the tip of the cradle arm 21. The take-up motor 22 is a motor that rotationally drives the bobbin holder. The take-up motor 22 is, for example, a general stepping motor. The take-up motor 22 may have a rotary encoder (not shown) that detects the rotation angle of the rotation axis (not shown) of the take-up motor 22. The take-up motor 22 is configured so that the number of rotations of the rotating shaft (the number of rotations per predetermined time) can be changed. As a result, the take-up motor 22 can change the take-up speed at which the yarn Y is taken up by the take-up bobbin Bw (that is, the peripheral speed on the surface of the take-up package Pw). The take-up motor 22 is electrically connected to the control device 15 (see FIG. 2).

The traverse device 23 is a device that twills the thread Y along the axial direction (left-right direction in this embodiment) of the take-up bobbin Bw. The traverse device 23 is arranged immediately upstream of the take-up package Pw in the yarn traveling direction. The traverse device 23 includes a traverse motor 31, an endless belt 32, and a traverse guide 33.

The traverse motor 31 is, for example, a general stepping motor. The traverse motor 31 is configured to be able to rotate the rotating shaft (not shown) in the forward and reverse directions. The traverse motor 31 may have a rotary encoder (not shown) that detects the rotation angle of the rotation axis (not shown) of the traverse motor 31. The traverse motor 31 is configured so that the rotation speed of the rotating shaft can be changed. The traverse motor 31 is electrically connected to the control device 15 (see FIG. 2). The endless belt 32 is a belt member to which the traverse guide 33 is attached. The endless belt 32 is wound around a pulley 34 and a pulley 35 arranged apart from each other in the left-right direction and a drive pulley 36 connected to a rotation shaft of a traverse motor 31, and is stretched in a substantially triangular shape. There is. The endless belt 32 is reciprocally driven by the traverse motor 31. The traverse guide 33 is attached to the endless belt 32 and is arranged between the pulley 34 and the pulley 35 in the left-right direction. The traverse guide 33 is reciprocated linearly in the left-right direction by reciprocating the endless belt 32 by the traverse motor 31 (see the arrow in FIG. 1). As a result, the traverse guide 33 swings the thread Y in the left-right direction (hereinafter, also referred to as the traverse direction).

The contact roller 24 is a roller for applying contact pressure to the surface of the take-up package Pw to adjust the shape of the take-up package Pw. The contact roller 24 comes into contact with the take-up package Pw and rotates in accordance with the rotation of the take-up package Pw.

The yarn feed unit 14 is configured to feed the yarn Y unwound from the yarn supply package Ps to the take-up bobbin Bw. The thread feeding section 14 is arranged between the thread feeding section 12 and the winding section 13 in the thread traveling direction. The thread feed unit 14 has a feed roller 41 and a roller drive motor 42.

The feed roller 41 is a roller around which the thread Y is wound. The feed roller 41 is, for example, a known nip roller. The feed roller 41 is provided on the front surface of the machine base 11. The feed roller 41 is configured to feed the yarn Y to the downstream side in the yarn traveling direction by rotating. The feed roller 41 is rotationally driven by a roller drive motor 42. The roller drive motor 42 is, for example, a general stepping motor. The roller drive motor 42 may have a rotary encoder (not shown) that detects the rotation angle of the rotation axis (not shown) of the roller drive motor 42. The roller drive motor 42 is configured so that the rotation speed of the rotating shaft can be changed. As a result, the roller drive motor 42 can change the rotation speed of the feed roller 41 (that is, the thread feed speed by the feed roller 41 can be changed). The roller drive motor 42 is electrically connected to the control device 15 (see FIG. 2). In the present embodiment, tension is applied to the yarn Y by the speed difference between the winding speed by the winding unit 13 and the yarn feeding speed by the thread feeding unit 14. That is, the configuration in which the winding unit 13 and the thread feed unit 14 are combined corresponds to the tension applying unit of the present invention. Generally, when the speed difference is large, the tension is large, and when the speed difference is small, the tension is small.

A thread guide 16 is arranged on the lower side (upstream side in the thread traveling direction) of the thread feed portion 14. The thread guide 16 is arranged, for example, on an extension line of the central axis of the thread feeding bobbin Bs. The thread guide 16 guides the thread Y unwound from the thread supply package Ps to the downstream side in the thread traveling direction. A tension sensor 17 (tension detection unit of the present invention) is arranged on the upper side (downstream side in the thread traveling direction) of the thread feed unit 14. The tension sensor 17 is configured to detect the tension applied to the yarn Y traveling from the yarn feed portion 14 toward the take-up portion 13. The tension sensor 17 is, for example, a contact type sensor having a piezoelectric element (not shown), but is not limited thereto. The tension sensor 17 is electrically connected to the control device 15 (see FIG. 2). The tension sensor 17 outputs a detection signal to the control device 15. The tension sensor 17 also functions as a fulcrum guide that serves as a fulcrum when the thread Y is swung by the traverse guide 33. A thread guide (not shown) that functions as a fulcrum guide may be provided on the downstream side of the tension sensor 17 in the thread traveling direction.

The control device 15 includes a CPU, a ROM, a RAM (storage unit 51, see FIG. 2) and the like. The storage unit 51 stores, for example, parameters such as the winding amount of the yarn Y, the winding speed, and the target tension to be applied to the yarn Y. The control device 15 controls each unit by the CPU according to the program stored in the ROM based on the parameters stored in the storage unit 51 and the like. The control device 15 is electrically connected to the take-up motor 22, the traverse motor 31, the roller drive motor 42, and the tension sensor 17 (see FIG. 2).

As will be described later, the control device 15 functions as a take-up control unit 52, a traverse control unit 53 (prediction information acquisition unit of the present invention), and a roller control unit 54 (tension adjustment unit of the present invention) (see FIG. 2). .. First, the control device 15 acquires winding information regarding the target value of the rotation speed of the winding bobbin Bw (or the winding speed of the yarn Y by the winding unit 13) from the storage unit 51. The control device 15 outputs a signal for controlling the torque of the take-up motor 22 to the take-up motor 22 based on the take-up information. That is, the control device 15 functions as a take-up control unit 52 that controls the take-up motor 22.

Further, the control device 15 acquires the target traverse information regarding the target position and the target speed of the traverse guide 33 from the storage unit 51. The control device 15 outputs a signal for controlling the torque of the traverse motor 31 to the traverse motor 31 based on the target traverse information. That is, the control device 15 functions as a traverse control unit 53 that controls the traverse motor 31.

Further, the control device 15 acquires the thread feed information regarding the rotation speed of the feed roller 41 (in other words, the thread feed rate by the thread feed unit 14). The control device 15 outputs a signal for controlling the rotation speed of the feed roller 41 (more accurately, the torque of the roller drive motor 42) to the roller drive motor 42 based on the thread feed information. That is, the control device 15 functions as a roller control unit 54 that controls the roller drive motor 42.

In the rewinder 1 as described above, the yarn Y unwound from the yarn feeding package Ps travels to the downstream side in the yarn traveling direction. The traveling thread Y is wound by the rotating winding bobbin Bw while being traversed in the left-right direction (traverse direction) by the traverse guide 33. The tension applied to the yarn Y mainly approaches a predetermined target tension by adjusting the rotation speed of the feed roller 41 (in other words, by adjusting the yarn feed rate by the yarn feed unit 14). Be controlled. That is, the tension of the thread Y is increased by the control device 15 (roller control unit 54) adjusting the rotation speed based on the rotation speed adjustment information (adjustment information of the present invention) relating to the adjustment of the rotation speed of the feed roller 41. Be controlled. The details of tension control will be described later.

(Round trip of traverse guide)
The reciprocating movement of the traverse guide 33 will be described with reference to FIG. The graph on the upper side of the paper in FIG. 3 is a graph showing the relationship between the position of the traverse guide 33 in the traverse direction and the time. The graph on the lower side of the paper in FIG. 3 is a graph showing the relationship between the speed and the time in the traverse direction of the traverse guide 33.

In the graph shown in the upper part of the paper in FIG. 3, the horizontal axis indicates the time, and the vertical axis indicates the position of the traverse guide 33 in the traverse direction. For convenience of explanation, the left side of the center of the region (traverse region) in which the traverse guide 33 reciprocates is defined as the positive direction of the vertical axis of the graph. In addition, the right side of the center of the traverse area is the negative direction of the vertical axis of the graph. The traverse guide 33 reciprocates in the left-right direction by driving and controlling the traverse motor 31 by the control device 15. The symbol "T" shown in FIG. 3 indicates a cycle in which the traverse guide 33 makes one round trip. As a specific example, when the time is 0 in FIG. 3, the traverse guide 33 is located in the center of the traverse region. When the time is T / 4, the traverse guide 33 is located at the left end of the traverse area. When the time is T / 2, the traverse guide 33 is located in the center of the traverse area. When the time is 3T / 4, the traverse guide 33 is located at the right end of the traverse area. When the traverse guide 33 is located in the center of the traverse region, the thread path from the fulcrum guide (tension sensor 17 in this embodiment) to the traverse guide 33 is the shortest. When the traverse guide 33 is located at the end of the traverse region, the thread path is the longest.

Further, the speed of the traverse guide 33 changes as shown in the graph shown in the lower portion of the paper in FIG. As a specific example, when the time is T / 4, the traveling direction of the traverse guide 33 is switched from left to right. When the time is 3T / 4, the traveling direction of the traverse guide 33 is switched from right to left.

(Fluctuation of thread tension due to reciprocating movement of traverse guide)
Next, the change in tension due to the reciprocating movement of the traverse guide 33 will be described with reference to FIGS. 4 and 5. FIG. 4 is a first reference example of a graph showing the relationship between the position of the traverse guide 33, the rotation speed of the feed roller 41, the tension of the thread Y, and the time. FIG. 5 is a second reference example. In FIGS. 4 and 5, the graph on the upper side of the paper shows the relationship between the position of the traverse guide 33 and the time. The graph in the middle in the vertical direction of the paper shows the relationship between the rotation speed of the feed roller 41 and the time. The graph on the lower side of the paper shows the relationship between the tension of the thread Y and the time.

The tension of the yarn Y is roughly determined by the speed difference between the take-up speed and the yarn feed speed as described above. However, the tension actually applied to the thread Y may fluctuate due to the reciprocating movement of the traverse guide 33. For example, when the traverse guide 33 is directed from the center to the end in the traverse direction, the tension is unintentional due to the lengthening of the thread path and the pulling of the thread Y outward in the traverse direction by the traverse guide 33. Can increase. Further, when the traveling direction of the traverse guide 33 is switched from the outside to the inside at the end of the traverse direction, the thread path is shortened and the tension of the thread Y by the traverse guide 33 is temporarily loosened. , Tension can be unintentionally reduced.

Various means have been conventionally proposed in order to suppress such fluctuations in tension. As a first reference example, there is a control means for suppressing the tension fluctuation by reflecting the detection result by the tension sensor 17 in the control of the roller drive motor 42. The control is, for example, general feedback control. By this control, for example, as shown in FIG. 4, the rotation speed of the feed roller 41 is changed, thereby changing the yarn feed rate. However, in this control method, the yarn feed rate is changed after the tension actually fluctuates, so that the following problems may occur. For example, when the traverse cycle is short (the movement of the traverse guide is quick), the adjustment of the thread feed rate may not be able to follow the fluctuation of the tension caused by the movement of the traverse guide 33. In this case, as shown in FIG. 4, the fluctuation of the tension cannot be sufficiently suppressed, and the actual tension (see the solid line in FIG. 4) varies with respect to the target tension (see the dotted line in FIG. 4).

As a second reference example, there is a control means for adjusting the yarn feed rate by using the information regarding the position and / or the speed of the traverse guide 33. In this control, information about the change in tension depending on the position of the traverse guide 33 is taken into consideration for adjusting the yarn feed rate. That is, at the timing when the tension is predicted to increase due to the movement of the traverse guide 33, the rotation speed of the feed roller 41 is controlled so that the thread feed rate increases (see FIG. 5). Further, at the timing when the tension is predicted to decrease, the rotation speed of the feed roller 41 is controlled so that the thread feed rate becomes small (see FIG. 5).

However, there is a certain time lag (delay) between the time when the control device 15 (roller control unit 54) acquires the information regarding the change in the rotation speed of the feed roller 41 and the time when the rotation speed of the feed roller 41 is actually changed. There is. The time lag is caused by, for example, the time required for arithmetic processing by the roller control unit 54, the inertial mass of the rotating shaft (not shown) of the roller drive motor 42, the inertial mass of the feed roller 41, and the like. Since such a delay occurs, for example, when the traverse cycle is very short (when the movement of the traverse guide 33 is very quick), there is a possibility that the yarn feed rate cannot be adjusted in time. Therefore, in the means of the second reference example (see FIG. 5), the tension fluctuation can be suppressed as compared with the means of the first reference example (see FIG. 4), but the fluctuation may not be sufficiently suppressed. (See Fig. 5). Therefore, in the present embodiment, in order to effectively suppress the fluctuation of tension caused by the reciprocating movement of the traverse guide 33, the control device 15 performs the following control.

(Specific tension control method)
A specific method of tension control by the control device 15 will be described with reference to FIGS. 6 to 9. The tension control described below is the tension control within the cycle (T described above) in which the traverse guide 33 reciprocates once. In this embodiment, the target tension is constant (see the broken line in the graph on the lower side of the paper in FIG. 9). Further, in the present embodiment, the winding speed is substantially constant within the reciprocating cycle of the traverse guide 33.

In the storage unit 51, for example, a table in which the target position and the target speed of the traverse guide 33 and the time are associated with each other is stored. Alternatively, the control device 15 may be configured to calculate, for example, the target position and / or the target speed as a function of time. Alternatively, the storage unit 51 may store a table in which one of the target position and the target speed of the traverse guide 33 and the time are associated with each other. In this case, the control device 15 may calculate the other information based on the information of one of the target position and the target speed of the traverse guide 33. The control device 15 (traverse control unit 53) controls the operation of the traverse motor 31 based on the information of the target position and the target speed of the traverse guide 33.

The above information on the target position and the target speed is also used as information (predicted information) on the future position (predicted position) and the future speed (predicted speed) of the traverse guide 33, as will be described later. Specifically, for example, as shown in the table of FIG. 6, the predicted position where the traverse guide 33 is predicted to be located at a predetermined time t1 (first time of the present invention) is x1. The predicted speed of the traverse guide 33 at time t1 is v1. Further, the predicted position and the predicted speed of the traverse guide 33 at the time t2 (the second time of the present invention) after the predetermined time dt from the time t1 are x2 and v2, respectively. dt is a time shorter than the reciprocating cycle of the traverse guide 33. Similarly, the predicted position and the predicted speed of the traverse guide 33 at the time t3 after the predetermined time dt from the time t2 are x3 and v3, respectively.

Further, the relationship between the predicted position of the traverse guide 33 at a certain time and the actual rotation speed of the feed roller 41 at the same time is as shown in the table of FIG. For example, the predicted position of the traverse guide 33 corresponding to the time t1 is x1 as described above. The actual rotation speed of the feed roller 41 at time t1 is, for example, n1. n1 is a rotation speed for making the actual tension at time t1 substantially match the target tension, taking into consideration the tension fluctuation of the thread Y caused by the reciprocating movement of the traverse guide 33. Similarly, the actual rotation speed of the feed roller 41 at time t2 (predicted position x2) is n2. The actual rotation speed of the feed roller 41 at time t3 (predicted position x3) is n3.

Here, as described above, after the control device 15 (roller control unit 54) acquires the information regarding the adjustment of the rotation speed of the feed roller 41 (rotation speed adjustment information), the rotation speed of the feed roller 41 actually changes. There is a certain amount of time lag (delay) before it is done. Assuming that such a time lag is substantially equal to, for example, the above-mentioned predetermined time dt, the roller control unit 54 controls the thread feed unit 14 as follows, for example. In other words, the control device 15 is set as follows on the premise that the predetermined time dt is substantially equal to the time lag.

In order to calculate the command value (hereinafter referred to as the rotation speed command value) of the rotation speed of the feed roller 41 in the storage unit 51, for example, based on the information (prediction information) of the future predicted position and the predicted speed of the traverse guide 33. The function of is stored. This function is, for example, a function with a fixed coefficient (that is, the function outputs the same rotation speed command value when the same prediction information is input). The roller control unit 54 receives prediction information from the traverse control unit 53, and calculates a rotation speed command value using the function. Here, the roller control unit 54 calculates the rotation speed command value corresponding to the time t1 (in other words, information on the control signal to be output from the roller control unit 54 to the roller drive motor 42 at the time t1). The prediction information corresponding to the predetermined time dt and the future time t2 is used. The prediction information corresponding to the time t2 is the information of the predicted position and the predicted speed at the time t2 of the traverse guide 33.

As a specific example, the traverse control unit 53 sends the prediction information to the roller control unit 54 at an early stage, so that the prediction information corresponding to the time t2 can be used to calculate the rotation speed command value corresponding to the time t1. Become. As a result, the rotation speed command value corresponding to the time t1 becomes n2 (see the table of FIG. 8 and the graph of FIG. 9). That is, the roller control unit 54 acquires the predicted position x2 of the traverse guide 33 corresponding to the time t2 and the rotation speed command value (that is, n2) related to the predicted speed v2 as the rotation speed adjustment information corresponding to the time t1. .. In other words, the rotation speed adjustment information corresponding to the time t1 is acquired in association with the prediction information corresponding to the future time t2 by a predetermined time dt rather than the time t1.

As a result, the roller control unit 54 can output a control signal for adjusting the rotation speed of the feed roller 41 to n2 earlier than the time t2 by a predetermined time dt (at the center of the paper in FIG. 9). See dashed line). As a more specific example, just before the traverse guide 33 reaches the outer end in the traverse direction (time t2 in FIG. 9), the actual rotation speed of the feed roller 41 (see the solid line in FIG. 9) becomes the largest. You need to be. In order to realize this, the timing at which the command value of the rotation speed of the feed roller 41 (see the broken line in FIG. 9) becomes the largest is the time t1 which is a predetermined time dt before the time t2. As a result, the above-mentioned time lag (delay) is compensated, and the rotation speed of the feed roller 41 is adjusted at an appropriate timing. That is, the tension is adjusted at an appropriate timing, and the tension fluctuation is effectively suppressed.

The roller control unit 54 may acquire the rotation speed command value in consideration of the detection result by the tension sensor 17. That is, the roller control unit 54 has a command value for the rotation speed of the feed roller 41 (more accurately, a torque command value for the roller drive motor 42) based on the above-mentioned rotation speed command value and the detection result by the tension sensor 17. May be finally calculated (generated). As a result, tension fluctuations due to disturbance factors other than the reciprocating movement of the traverse guide 33 can be suppressed.

As described above, the rotation speed adjustment information corresponding to a certain time t1 is acquired in association with the prediction information corresponding to the time t2 after the predetermined time dt after the time t1 (that is, in the predetermined time dt future). As a result, the roller control unit 54 can output a signal related to the rotation speed adjustment (tension adjustment) to be executed at the time t2 by a predetermined time dt earlier than the time t2. Therefore, the delay can be compensated and the tension can be adjusted at an appropriate timing. Therefore, the fluctuation of tension caused by the reciprocating movement of the traverse guide 33 can be effectively suppressed.

Further, the predetermined time dt is as short as less than the reciprocating cycle of the traverse guide 33. Therefore, it is possible to prevent a large error between the predicted position of the traverse guide 33 corresponding to the time t2 predicted at the time t1 and the actual position of the traverse guide 33 at the time t2. Therefore, the tension can be controlled with high accuracy.

Further, by acquiring the rotation speed adjustment information based on the detection result by the tension sensor 17, feedback control can be performed so that the tension approaches a predetermined target value. Therefore, the tension fluctuation due to a disturbance factor other than the reciprocating movement of the traverse guide 33 can be suppressed, so that the tension can be further stabilized.

Further, in the present embodiment, the tension is controlled by controlling the thread feed rate by the thread feed unit 14. Therefore, the control can be simplified as compared with the case where the winding unit 13 is controlled to control the tension.

Next, 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.

(1) In the above embodiment, the roller control unit 54 calculates the rotation speed command value of the feed roller 41 by using a function based on the prediction information, but the present invention is not limited to this. For example, a table in which the time, the rotation speed command value corresponding to the time t1, and the information of the predicted position and / or the predicted speed corresponding to the time t2 are associated may be stored in the storage unit 51. As a specific example, the rotation speed adjustment information corresponding to the time t1 may be the rotation speed command value (that is, n2) associated with the predicted position x2 corresponding to the time t2 and the predicted speed v2 (see FIG. 8). The roller control unit 54 may acquire such information from the storage unit 51 and control the thread feed unit 14. Such control is also included in the control that "the information of the rotation speed command value corresponding to the time t1 is acquired in association with the prediction information corresponding to the time t2".

(2) Alternatively, the information on the rotation speed command value does not necessarily have to be clearly associated with the prediction information by a function, a table, or the like. That is, as a specific example described above, the actual rotation speed of the feed roller 41 (see the solid line in FIG. 9) becomes the largest immediately before the traverse guide 33 reaches the outer end in the traverse direction (time t2 in FIG. 9). Must be. On the other hand, the time when the rotation speed command value of the feed roller 41 (see the broken line in FIG. 9) becomes the largest is not the time t2 but the time t1 which is a predetermined time dt before the time t2. That is, for example, the time t1 at which the roller control unit 54 outputs a control signal for maximizing the rotation speed of the feed roller 41 to the roller drive motor 42 may be earlier than the time t2 by a predetermined time dt. Such control is also included in "control in which the information of the rotation speed command value corresponding to the time t1 is acquired in association with the prediction information corresponding to the time t2".

(3) In the above-described embodiments, the rotation speed command value of the feed roller 41 is assumed to be acquired by, for example, a predetermined function (that is, the coefficient included in the function is fixed). Not limited to this. For example, the above function may have a modifiable coefficient. The control device 15 may record the information of the rotation speed command value and the detection result by the tension sensor during the formation of the take-up package Pw. Based on these recorded information, the control device 15 may perform a calculation for updating the above coefficient so that the variation in the tension of the yarn Y is minimized. In other words, the control device 15 may be configured to perform learning for acquiring the optimum rotation speed command value during the formation of the take-up package Pw.

(4) In the above-described embodiments, the target tension of the yarn Y is assumed to be constant, but the target tension is not limited to this. That is, the control device 15 may change the target value of tension within the reciprocating cycle of the traverse guide 33. More specifically, as shown in FIG. 10, in the traverse direction, the target value of tension when the traverse guide 33 is located at the end is lower than the target value of tension when the traverse guide 33 is located at the center. You may. As a result, the following effects can be obtained. That is, when the tension of the thread Y is large when the traverse guide 33 is located at the end in the traverse direction, the thread Y is unintentionally pulled inward in the axial direction of the take-up bobbin Bw when the traverse guide 33 is turned. May be As a result, in the axial direction of the take-up bobbin Bw, the amount of the thread Y to be wound inward from the target position increases, and the shape of the take-up package Pw may be deformed. In this modification, the tension when the traverse guide 33 is located at the end in the traverse direction can be reduced. Therefore, it is possible to prevent the thread Y from being unintentionally pulled inward in the axial direction of the take-up bobbin Bw when the direction of the traverse guide 33 is changed. As described above, in the configuration in which the target value of tension is changed within the reciprocating cycle of the traverse guide 33, the control of suppressing the fluctuation of tension in consideration of the above-mentioned time lag is particularly effective.

(5) In the above-described embodiments, the predetermined time dt is shorter than the reciprocating cycle of the traverse guide 33, but the present invention is not limited to this. That is, when the reciprocating cycle of the traverse guide 33 is extremely short (when the movement of the traverse guide 33 is extremely quick), the predetermined time dt may be longer than the reciprocating cycle of the traverse guide 33.

(6) The predetermined time dt may be changed according to the winding conditions and the like. The predetermined time dt may be constant from the start of formation of the take-up package Pw to the completion of formation. Alternatively, the predetermined time dt may be appropriately changed between the start of formation of the take-up package Pw and the completion of formation.

(7) In the above-described embodiment, the rewinder 1 is provided with the tension sensor 17, but the rewinder 1 is not limited to this. Even if the tension sensor 17 is not always provided, it is possible to suppress the tension fluctuation caused by the reciprocating movement of the traverse guide 33 by the control as described above.

(8) In the above-described embodiment, the control device 15 controls the tension of the yarn Y by controlling the yarn feed rate, but the present invention is not limited to this. The control device 15 may control the tension of the yarn Y by controlling the take-up speed.

(9) In the above-described embodiments, tension is applied to the yarn Y by the speed difference between the winding speed and the yarn feeding speed, but the configuration of the tension applying portion is not limited to this. For example, the rewinder 1 may include a tension applying device (not shown) having a guide member (not shown) configured to sandwich the yarn Y instead of the yarn feed portion 14. In such a configuration, tension is applied to the yarn Y by the frictional force generated by the guide member sandwiching the yarn. The tension applying device may be configured so that the contact length at which the thread Y contacts the guide member and / or the force with which the guide member sandwiches the thread Y can be changed. As described above, instead of the speed difference, a tension applying portion that applies tension to the yarn Y by a frictional force may be provided.

(10) In the above-described embodiment, the traverse guide 33 is attached to the endless belt 32, but the present invention is not limited to this. For example, the traverse guide 33 may be attached to the tip of the arm that is oscillated (see JP-A-2007-153554, etc.). Alternatively, the traverse guide 33 may be reciprocally driven by a linear motor or the like.

(11) In the above-described embodiment, the traverse guide 33 is driven by a drive source configured to be able to drive forward and reverse, but the present invention is not limited to this. For example, the rewinder 1 may include a cam-type traverse device whose drive source is a motor that is rotationally driven in one direction.

(12) The present invention is not limited to the rewinder 1, and can be applied to various thread winders for winding a thread on a bobbin.

1 Rewinder (thread winder)
13 Winding part (tension applying part)
14 Thread feed part (tension applying part)
15 Control device (control unit)
17 Tension sensor (tension detector)
23 Traverse device 33 Traverse guide 53 Traverse control unit (prediction information acquisition unit)
54 Roller control unit (tension adjustment unit)
Bw take-up bobbin (bobbin)
dt Predetermined time Y thread t1 time (first time)
t2 time (second time)

Here, the tension actually applied to the yarn may fluctuate due to the reciprocating movement of the traverse guide. For example, in a predetermined traverse direction, when the traverse guide moves from the center to the end in the area where the traverse guide reciprocates , the thread path becomes long, or when the traverse guide reciprocates, the thread is traversed by the traverse guide. Tension can increase unintentionally due to being pulled outward in the direction. Further, in the area where the traverse guide reciprocates, when the traveling direction of the traverse guide is switched from the outside to the inside in the traverse direction, the thread path becomes short and the tension of the thread by the traverse guide temporarily loosens. Due to this, tension can be unintentionally reduced. Such fluctuations in tension can be suppressed by, for example, controlling the thread feed rate by a control device (tension adjusting unit) such as a computer. For example, Patent Document 2 proposes a means for controlling the thread feed rate by using information on the position of the traverse guide.

In the thread winder of the fourth invention, in any one of the first to third inventions, the tension applying section includes a winding section for winding the thread on the bobbin and a thread for feeding the thread to the bobbin. The yarn has a feed portion, and the yarn is wound on the bobbin by the take-up portion, and the yarn is sent to the bobbin by the yarn feed portion. A tension is applied, and the tension adjusting unit adjusts the tension by controlling the thread feed unit.

In the fifth aspect of the invention, the spool of the sixth aspect of the invention is the control unit, in which the traverse guide is located at the end of the traverse region where the traverse guide reciprocates with respect to the traverse direction in which the traverse guide moves. It is characterized in that the target value at the time is lower than the target value when the traverse guide is located at the center in the traverse region .

In the traverse region, if the tension of the thread is high when the traverse guide is located at the end of the traverse direction, the thread may be unintentionally pulled inward in the axial direction of the bobbin when the traverse guide is turned. As a result, in the axial direction of the bobbin, the amount of yarn wound inward from the target position increases, and the shape of the package may be deformed. In the present invention, the tension when the traverse guide is located at the end in the traverse direction in the traverse region can be reduced. Therefore, it is possible to prevent the thread from being unintentionally pulled inward in the axial direction of the bobbin when the direction of the traverse guide is changed.

Further, the speed of the traverse guide 33 changes as shown in the graph shown in the lower portion of the paper in FIG. As a specific example, when the time is T / 4, the traveling direction of the traverse guide 33 is switched from left to right in the traverse area . When the time is 3T / 4, the traveling direction of the traverse guide 33 is switched from right to left in the traverse area .

The tension of the yarn Y is roughly determined by the speed difference between the take-up speed and the yarn feed speed as described above. However, the tension actually applied to the thread Y may fluctuate due to the reciprocating movement of the traverse guide 33. For example, in the traverse region, when the traverse guide 33 is directed from the center to the end in the traverse direction, the thread path becomes long, and in the traverse region, the thread Y is pulled outward in the traverse direction by the traverse guide 33. Thus, tension can increase unintentionally. Further, in the traverse region, when the traveling direction of the traverse guide 33 is switched from the outside to the inside at the end of the traverse direction, the thread path is shortened and the tension of the thread Y by the traverse guide 33 is temporarily loosened. Due to this, tension can be unintentionally reduced.

As a result, the roller control unit 54 can output a control signal for adjusting the rotation speed of the feed roller 41 to n2 earlier than the time t2 by a predetermined time dt (at the center of the paper in FIG. 9). See dashed line). As a more specific example, just before the traverse guide 33 reaches the outer end in the traverse direction in the traverse region (time t2 in FIG. 9), the actual rotation speed of the feed roller 41 (see the solid line in FIG. 9) is the most. It needs to be big. In order to realize this, the timing at which the command value of the rotation speed of the feed roller 41 (see the broken line in FIG. 9) becomes the largest is the time t1 which is a predetermined time dt before the time t2. As a result, the above-mentioned time lag (delay) is compensated, and the rotation speed of the feed roller 41 is adjusted at an appropriate timing. That is, the tension is adjusted at an appropriate timing, and the tension fluctuation is effectively suppressed.

(2) Alternatively, the information on the rotation speed command value does not necessarily have to be clearly associated with the prediction information by a function, a table, or the like. That is, as a specific example described above, immediately before the traverse guide 33 reaches the outer end in the traverse direction in the traverse region (time t2 in FIG. 9), the actual rotation speed of the feed roller 41 (see the solid line in FIG. 9) Must be the largest. On the other hand, the time when the rotation speed command value of the feed roller 41 (see the broken line in FIG. 9) becomes the largest is not the time t2 but the time t1 which is a predetermined time dt before the time t2. That is, for example, the time t1 at which the roller control unit 54 outputs a control signal for maximizing the rotation speed of the feed roller 41 to the roller drive motor 42 may be earlier than the time t2 by a predetermined time dt. Such control is also included in "control in which the information of the rotation speed command value corresponding to the time t1 is acquired in association with the prediction information corresponding to the time t2".

(4) In the above-described embodiments, the target tension of the yarn Y is assumed to be constant, but the target tension is not limited to this. That is, the control device 15 may change the target value of tension within the reciprocating cycle of the traverse guide 33. More specifically, as shown in FIG. 10, with respect to the traverse direction, the target value of the tension when the traverse guide 33 is located at the end in the traverse region, and the tension when the traverse guide 33 is located at the center in the traverse region. It may be lower than the target value of. As a result, the following effects can be obtained. That is, when the tension of the thread Y is large when the traverse guide 33 is located at the end in the traverse direction in the traverse region, the thread Y is intended to be inward in the axial direction of the take-up bobbin Bw when the traverse guide 33 is turned. There is a risk of being attracted without doing so. As a result, in the axial direction of the take-up bobbin Bw, the amount of the thread Y to be wound inward from the target position increases, and the shape of the take-up package Pw may be deformed. In this modification, the tension when the traverse guide 33 is located at the end in the traverse direction in the traverse region can be reduced. Therefore, it is possible to prevent the thread Y from being unintentionally pulled inward in the axial direction of the take-up bobbin Bw when the direction of the traverse guide 33 is changed. As described above, in the configuration in which the target value of tension is changed within the reciprocating cycle of the traverse guide 33, the control of suppressing the fluctuation of tension in consideration of the above-mentioned time lag is particularly effective.

Claims (6)

It is a thread winder that winds running thread on a bobbin.
A traverse device having a traverse guide for twilling the thread along the axial direction of the bobbin.
A tension applying portion that applies tension to the thread wound around the bobbin, and
With a control unit,
The control unit
A prediction information acquisition unit that acquires prediction information regarding at least one of the future prediction position and the prediction speed of the traverse guide.
It has a tension adjusting unit that controls the tension applying unit based on the adjustment information regarding the tension adjustment, and has.
The tension adjusting unit is
A thread winder, characterized in that the adjustment information corresponding to a predetermined first time is acquired in association with the prediction information corresponding to the second time after a predetermined time after the first time. The thread winder according to claim 1, wherein the predetermined time is shorter than the reciprocating cycle of the traverse guide. It is equipped with a tension detection unit that detects the tension applied to the yarn.
The thread winder according to claim 1 or 2, wherein the tension adjusting unit acquires the adjusting information based on a detection result by the tension detecting unit. The tension applying portion is
It has a winding section for winding a thread on the bobbin and a thread feeding section for feeding the thread to the bobbin.
The tension is applied to the yarn by the speed difference between the winding speed at which the yarn is wound on the bobbin by the winding portion and the yarn feeding speed at which the yarn is sent to the bobbin by the yarn feeding portion.
The tension adjusting unit is
The thread winder according to any one of claims 1 to 3, wherein the tension is controlled by controlling the thread feed unit. The control unit
The thread winder according to any one of claims 1 to 4, wherein the target value of the tension is changed within the reciprocating cycle of the traverse guide. The control unit
5. The target value when the traverse guide is located at the end is lower than the target value when the traverse guide is located at the center with respect to the traverse direction in which the traverse guide moves. The thread winder described in.

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