阅读说明：本技术 纱线卷取机以及纱线卷取方法 (Yarn winding machine and yarn winding method ) 是由 牟田胜文 一阶朋之 于 2019-01-09 设计创作，主要内容包括：本发明提供纱线卷取机以及纱线卷取方法。自动络纱机(纱线卷取机)具备卷取部、检测部以及控制部。卷取部卷绕纱线而形成卷装。检测部检测在卷装直径的运算中使用的值。控制部运算基于检测部检测出的值的卷装直径亦即运算卷装直径。控制部基于运算卷装直径的增大来更新用于控制纱线的卷绕的卷装直径亦即控制用卷装直径。控制部计算增加阈值,该增加阈值的值基于纱线粗细以及控制用卷装直径中的至少任一个而变化。控制部在从运算卷装直径减去控制用卷装直径而得到的值超过增加阈值的情况下,使控制用卷装直径增加与该增加阈值相当的量。(The invention provides a yarn winding machine and a yarn winding method. An automatic winder (yarn winding machine) includes a winding unit, a detection unit, and a control unit. The winding section winds the yarn to form a package. The detection unit detects a value used for calculating the package diameter. The control section calculates a calculated package diameter which is a package diameter based on the value detected by the detection section. The control unit updates the control package diameter, which is the package diameter for controlling the winding of the yarn, based on the calculated increase in the package diameter. The control unit calculates an increase threshold value, the value of which varies depending on at least one of the yarn thickness and the control package diameter. The control unit increases the control package diameter by an amount corresponding to an increase threshold when a value obtained by subtracting the control package diameter from the calculated package diameter exceeds the increase threshold.)

1. A yarn winding machine is characterized by comprising:

a winding section for winding the yarn to form a package;

a detection unit that detects a value used for calculating the package diameter; and

a control part for controlling the operation of the display device,

the control part

Calculating a package diameter which is a package diameter based on the value detected by the detecting section,

updating a control package diameter, which is a package diameter for controlling winding of the yarn, based on the increase in the calculated package diameter,

calculating an increase threshold value whose value changes based on at least one of the yarn thickness and the package diameter for control,

when a value obtained by subtracting the control package diameter from the calculated package diameter exceeds the increase threshold, the control package diameter is increased by an amount corresponding to the increase threshold.

2. The yarn winding machine of claim 1,

the control unit determines a minimum increase threshold and a maximum increase threshold among the increase thresholds calculated by the control unit,

the control unit calculates the increase threshold so as to be equal to or higher than the minimum increase threshold and equal to or lower than the maximum increase threshold.

3. The yarn winding machine of claim 2,

the control section calculates the increase threshold that varies based on both the yarn thickness and the control package diameter.

4. The yarn winding machine as claimed in claim 3,

the control unit calculates an initial increase threshold, which is the increase threshold applied when the package diameter for control is the smallest, based on the yarn thickness.

5. The yarn winding machine as claimed in claim 4,

the control unit calculates the control package diameter when the increase threshold value matches the minimum increase threshold value based on the yarn thickness.

6. Yarn winding machine according to claim 5,

the control unit calculates a correspondence relationship between the increase threshold and the control package diameter, which includes a portion where the increase threshold linearly changes according to an increase in the control package diameter, based on the initial increase threshold, the control package diameter at the time of the initial increase threshold, the minimum increase threshold, and the control package diameter at the time of the minimum increase threshold.

7. The yarn winding machine according to any one of claims 2 to 6,

the control unit calculates the increase threshold value based on at least the yarn thickness, and the minimum increase threshold value is constant regardless of the yarn thickness.

8. The yarn winding machine according to any one of claims 1 to 7,

the control unit calculates a yarn thickness based on the number of yarns to be input, and calculates the increase threshold based on the calculated yarn thickness.

9. The yarn winding machine according to any one of claims 1 to 7, further comprising:

a plurality of winding units; and

a control device for setting the plurality of winding units collectively,

the control device calculates a yarn thickness based on the number of yarns to be input, and transmits the calculated yarn thickness to each of the control units provided in the plurality of winding units.

10. The yarn winding machine according to any one of claims 1 to 9,

the control section does not perform a process of reducing the control package diameter and does not change the control package diameter even when the calculated package diameter is smaller than the control package diameter.

11. A yarn winding method for winding a yarn to form a package, comprising:

a calculation step of calculating a calculated package diameter that is a package diameter based on the detected value;

an updating step of updating a control package diameter, which is a package diameter for controlling winding of the yarn, based on the increase in the calculated package diameter; and

a calculation step of calculating an increase threshold value, a value of which changes based on at least one of the yarn thickness and the control package diameter,

in the updating step, when a value obtained by subtracting the control package diameter from the calculated package diameter exceeds the increase threshold, the control package diameter is increased by an amount corresponding to the increase threshold.

Technical Field

The present invention relates generally to a yarn winding machine that controls winding of a yarn according to a package diameter for control.

Background

Conventionally, there is known a yarn winding machine that calculates a package diameter by calculation and controls winding of a yarn using the package diameter calculated by the calculation. In the yarn winding machine of patent document 1, the peripheral speed of the package and the rotational speed of the package are detected by sensors, and the average outer shape of the package is calculated based on these. Patent document 1 describes calculating a drive point of the package using the package reference value, which is the average package profile calculated in this manner.

Patent document 1: japanese patent laid-open No. 2014-40325

However, patent document 1 does not describe how to update the package reference value. For example, when the package diameter obtained by the calculation is updated as the package reference value while keeping the same, if the average outer shape of the package greatly changes due to the detection error of the sensor and the influence of noise, the drive point of the package is calculated in accordance with the change, and therefore the control content is often inappropriate. Further, the same problem exists not only in the calculation of the drive point of the package but also in other controls related to the winding of the yarn.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and a main object thereof is to provide a yarn winding machine that performs control related to winding of a yarn in accordance with a package diameter, the yarn winding machine being configured to suppress a sudden change in the control content.

The problems to be solved by the present invention are as described above, and means for solving the problems and effects thereof will be described below.

According to a first aspect of the present invention, there is provided a yarn winding machine configured as follows. That is, the yarn winding machine includes a winding unit, a detection unit, and a control unit. The winding section winds the yarn to form a package. The detection unit detects a value used for calculating the package diameter. The control unit calculates a calculated package diameter that is a package diameter based on the value detected by the detection unit. The control unit updates the control package diameter, which is the package diameter for controlling the winding of the yarn, based on the increase in the calculated package diameter. The control unit calculates an increase threshold value, a value of which varies depending on at least one of the yarn thickness and the package diameter for control. The control unit increases the control package diameter by an amount corresponding to the increase threshold when a value obtained by subtracting the control package diameter from the calculated package diameter exceeds the increase threshold.

Thus, the increase threshold is set for updating the control package diameter, and the content of control of the wound yarn can be prevented from changing rapidly. In particular, the influence of updating the control package diameter differs depending on the yarn thickness or the control package diameter. Therefore, by setting the increase threshold based on these cases, the control package diameter can be updated appropriately.

In the yarn winding machine, the following configuration is preferable. That is, the minimum increase threshold and the maximum increase threshold are determined among the increase thresholds calculated by the control unit. The control unit calculates the increase threshold so as to be equal to or higher than the minimum increase threshold and equal to or lower than the maximum increase threshold.

This can prevent the increase threshold from being calculated and applied excessively small or large, and therefore the control package diameter can be updated more appropriately.

In the yarn winding machine, the control unit preferably calculates the increase threshold that varies based on both the yarn thickness and the control package diameter.

Thus, the threshold value changes based on both the two values relating to the magnitude of the influence of the update of the control package diameter, so the control package diameter can be updated more appropriately.

In the yarn winding machine, it is preferable that the control unit calculates an initial increase threshold, which is the increase threshold applied when the control package diameter is minimum, based on the yarn thickness.

This makes it possible to calculate the initial increase threshold value by a simple process.

In the yarn winding machine, it is preferable that the control unit calculates the control package diameter when the increase threshold value matches the minimum increase threshold value based on a yarn thickness.

Thus, the control package diameter when the increase threshold value matches the minimum increase threshold value can be calculated by a simple process.

In the yarn winding machine, it is preferable that the control unit calculates a correspondence relationship between the increase threshold and the control package diameter, the correspondence relationship including a portion in which the increase threshold linearly changes according to an increase in the control package diameter, based on the initial increase threshold, the control package diameter at the time of the initial increase threshold, the minimum increase threshold, and the control package diameter at the time of the minimum increase threshold.

Thus, the correspondence relationship between the increase threshold and the control package diameter can be calculated by a simple process of obtaining two points on the coordinate axis and obtaining a straight line passing through the two points.

In the yarn winding machine, it is preferable that the control unit calculates the increase threshold value based on at least a yarn thickness. The above-mentioned minimum increase threshold value is constant irrespective of the yarn thickness.

This eliminates the need for calculation processing of the minimum increase threshold value corresponding to the yarn thickness, and therefore, the processing becomes simple.

In the yarn winding machine, it is preferable that the control unit calculates a yarn thickness based on the number of yarns to be input, and calculates the increase threshold based on the calculated yarn thickness.

This eliminates the need for the operator to directly input the yarn thickness, and thus reduces the operator's trouble.

In the yarn winding machine, the following configuration is preferable. That is, the yarn winding machine includes a plurality of winding units and a control device. The control device sets the plurality of winding units collectively. The control device calculates a yarn thickness based on the number of yarns to be input, and transmits the calculated yarn thickness to the control unit of each of the plurality of winding units.

Thus, the yarn thickness can be set for the plurality of winding units by inputting only the yarn count to the control device, and therefore, the trouble of the operator can be reduced.

In the yarn winding machine, it is preferable that the control section does not perform a process of reducing the control package diameter and does not change the control package diameter even when the calculated package diameter is smaller than the control package diameter.

This prevents the winding control from becoming inappropriate as the diameter of the control package decreases.

A second aspect of the present invention provides the following yarn winding method. That is, the yarn winding method includes a calculation step, an update step, and a calculation step. In the calculating step, a calculated package diameter, which is a package diameter based on the detected value, is calculated. In the updating step, the control package diameter, which is the package diameter for controlling the winding of the yarn, is updated based on the increase in the calculated package diameter. In the calculating step, an increase threshold value is calculated, and a value of the increase threshold value changes based on at least one of the yarn thickness and the control package diameter. In the updating step, when a value obtained by subtracting the control package diameter from the calculated package diameter exceeds the increase threshold, the control package diameter is increased by an amount corresponding to the increase threshold.

Thus, the increase threshold is set for updating the control package diameter, and the rapid change of the control of the wound yarn can be prevented. In particular, the magnitude of the influence of the update of the control package diameter differs depending on the yarn thickness or the control package diameter. Therefore, by setting the increase threshold based on these cases, the control package diameter can be updated appropriately.

Drawings

Fig. 1 is a front view of an automatic winder according to an embodiment of the present invention.

Fig. 2 is a front view and a block diagram of the yarn winding unit.

Fig. 3 is a diagram illustrating a process of controlling the traverse width based on the control package diameter.

Fig. 4 is a flowchart showing a process of updating the control package diameter based on the increase threshold.

Fig. 5 is a diagram showing a correspondence relationship between the yarn thickness and the package diameter for control and the increase threshold value.

Fig. 6 is a diagram showing another example of the correspondence relationship between the yarn thickness and the package diameter for control and the increase threshold value.

Detailed Description

Next, embodiments of the present invention will be described with reference to the drawings. In the present specification, "upstream" and "downstream" refer to upstream and downstream in the running direction of the yarn when the yarn is wound.

As shown in fig. 1, an automatic winder (yarn winding machine) 1 includes: a plurality of yarn winding units 10, a doffing device 60, and a machine control device (control device) 90 arranged in a row.

Each yarn winding unit 10 traverses the yarn 20 unwound from the yarn feeding bobbin 21, and winds the yarn around a conical winding tube 22 supported by a cradle (winding tube support portion) 23 to form a conical package 30. Further, the cradle 23 has: a small-diameter side support portion for rotatably supporting the small-diameter side end of the winding tube 22, and a large-diameter side support portion for rotatably supporting the large-diameter side end of the winding tube 22. The yarn winding unit 10 may be configured to wind the yarn 20 around a cylindrical winding tube 22 to form a package 30 having a bobbin shape.

The doffing device 60 moves to the position of the yarn winding unit 10 when the package 30 is fully wound in each yarn winding unit 10. In the doffer 60, in the yarn winding unit 10, the fully wound package 30 is taken out from the cradle 23 and supplied to the winding tube 22 around which the yarn 20 is not wound.

The machine control device 90 includes a machine input unit 91 and a machine display unit 92. The machine input unit 91 can collectively perform setting for each yarn winding unit 10 by inputting a predetermined set value or selecting an appropriate control method by an operator. The machine table display unit 92 can display an input screen of a set value, the winding state of the yarn 20 in each yarn winding unit 10, the contents of a failure occurring, and the like.

Next, the structure of the yarn winding unit 10 will be specifically described with reference to fig. 2. As shown in fig. 2, each yarn winding unit 10 includes a winding unit main body 17 and a unit control unit (control unit) 51.

The unit control unit 51 includes an arithmetic device such as a CPU, a RAM, a ROM, an I/O port, and a communication port. The ROM stores a program for controlling each part of the winding unit main body 17. The I/O port and the communication port are connected to each unit provided in the winding unit main body 17 and the machine control device 90, and communication of control information and the like is possible. Thereby, the unit control section 51 can control the operation of each section provided in the winding unit main body 17.

In the winding unit main body 17, in a yarn running path between the yarn supplying bobbin 21 and the contact roller 29, a yarn unwinding assisting device 12, a tension applying device 13, a splicing device 14, a yarn length detecting sensor (detecting section) 15, a yarn clearer 16, and a winding section 18 are arranged in this order from the yarn supplying bobbin 21 side.

The yarn unwinding assisting device 12 lowers the regulating member 40 covering the core tube of the yarn feeding bobbin 21 in conjunction with the unwinding of the yarn 20 from the yarn feeding bobbin 21, thereby assisting the unwinding of the yarn 20 from the yarn feeding bobbin 21. The regulating member 40 contacts a balloon formed on the upper portion of the yarn feeding bobbin 21 by the rotation and centrifugal force of the yarn 20 unwound from the yarn feeding bobbin 21, and controls the balloon to an appropriate size, thereby assisting the unwinding of the yarn 20. A sensor, not shown, for detecting the upper portion of the yarn layer of the yarn feeding bobbin 21 is provided near the regulating member 40. When the sensor detects the lowering of the upper portion of the yarn layer, the regulating member 40 is lowered accordingly.

The tension applying device 13 applies a predetermined tension to the running yarn 20. As the tension applying device 13, for example, a gate type in which movable comb teeth are arranged with respect to fixed comb teeth can be used. The movable comb teeth can be rotated by a rotary solenoid so that the comb teeth are engaged with each other or disengaged from each other. The tension applying device 13 may be a disk type, for example, in addition to the gate type.

The yarn splicing device 14 splices the lower yarn on the yarn supply bobbin 21 side and the upper yarn on the package 30 side when the yarn clearer 16 detects a yarn defect and performs yarn cutting, or when a yarn breakage occurs during unwinding from the yarn supply bobbin 21. The joint device 14 may be configured by a mechanical type or a fluid such as compressed air.

The yarn length detection sensor 15 detects the yarn length of the yarn 20 wound in the package 30 in a non-contact manner. The yarn length detection sensor 15 detects the amount of hairiness of the yarn 20, calculates the amount of movement of the yarn 20, and detects the yarn length. Specifically, the yarn length detection sensor 15 is provided with a plurality of optical hairiness detection portions each including a light receiving element and a light source along the yarn traveling direction. The yarn length detection sensor 15 detects the running length of the yarn 20 based on changes in the output signals of the plural hairiness detection portions located at different positions in the yarn running direction.

The unit control unit 51 can determine the package diameter using the running length of the yarn 20 detected by the yarn length detection sensor 15. Specifically, the unit control section 51 can calculate the winding angle from the yarn running speed calculated based on the yarn running length detected by the yarn length detection sensor 15 and the traverse speed. The traverse speed can be obtained based on the control performed by the unit control section 51. The unit control section 51 calculates the package diameter based on the winding angle, the peripheral speed of the package 30, and the rotational speed of the package 30.

The yarn clearer 16 includes: a yarn clearer 49 provided with an unillustrated sensor for detecting the thickness of the yarn 20 and an analyzer 55 for processing a yarn thickness signal from the sensor are arranged. The yarn clearer 16 monitors a yarn thickness signal from the sensor to detect a yarn defect such as a slub. A cutter, not shown, is provided near the clearer head 49 to cut the yarn 20 immediately when the clearer 16 detects a yarn defect.

A lower yarn catching member 25 that catches the yarn end of the lower yarn on the yarn feeding bobbin 21 side and guides the yarn end to the yarn splicing device 14, and an upper yarn catching member (guide member) 26 that catches the yarn end of the upper yarn on the package 30 side and guides the yarn end to the yarn splicing device 14 are provided on the lower side and the upper side of the yarn splicing device 14, respectively. The lower yarn catching member 25 includes a lower yarn guide arm 33 and a lower yarn suction port 32 formed at the tip of the lower yarn guide arm 33. The upper yarn catching member 26 includes an upper yarn guide arm 36 and an upper yarn suction port 35 formed at the tip of the upper yarn guide arm 36.

The lower bobbin arm 33 and the upper bobbin arm 36 are rotatable about a shaft 34 and a shaft 37, respectively. The lower yarn bobbin arm 33 and the upper yarn bobbin arm 36 are connected to appropriate negative pressure sources (not shown). Thereby, suction flows are generated in the lower yarn suction port 32 and the upper yarn suction port 35, and yarn ends of the upper yarn and the lower yarn can be sucked and caught by the lower yarn bobbin arm 33 and the upper yarn bobbin arm 36, respectively.

The winding unit 18 includes: a cradle 23 for detachably supporting the winding tube 22, a contact roller 29 which is in contact with the outer peripheral surface of the winding tube 22 or the outer peripheral surface of the package 30 and is rotatable, a traverse arm (traverse section) 71, and a traverse drive motor 72.

The cradle 23 can rotate about the rotation shaft 48. The yarn layer increases as the yarn 20 is wound around the winding tube 22, and the cradle 23 rotates accordingly. This can eliminate the influence of the shape change accompanying the increase of the yarn layer.

A package driving motor 41 is attached to the cradle 23. The winding tube 22 is rotationally driven by the package driving motor 41, and the yarn 20 is wound around the winding tube 22. The motor shaft of the package driving motor 41 is connected to the winding tube 22 so as not to be relatively rotatable when the winding tube 22 is supported by the cradle 23 (so-called direct drive method). The operation of the package driving motor 41 is controlled by the package driving control section 42. The package drive control unit 42 receives an instruction from the unit control unit 51 to adjust the rotation speed (or the acceleration) of the package drive motor 41.

A package rotation sensor (detecting unit) 47 is attached to the tip end portion on the opposite side of the cradle 23. The package rotation sensor 47 detects the amount of rotation of the winding tube 22 (package 30) attached to the cradle 23. The package rotation sensor 47 outputs a pulse signal to the unit control unit 51 every time the package 30 rotates by a predetermined angle. The unit control section 51 can calculate the rotational speed of the package 30 by measuring the number of pulses per hour.

The traverse arm 71 engages with the yarn 20 to traverse the yarn 20. The traverse arm 71 is driven by a traverse drive motor 72. Specifically, the traverse arm 71 is provided to continuously reciprocate in the package width direction (the axial direction of the winding tube 22 and the package 30) in conjunction with the normal and reverse rotation of the rotor of the traverse driving motor 72. The operation of the traverse drive motor 72 is controlled by the unit control section 51 via the traverse drive control section 73. A hook-shaped yarn guide section is formed at the tip end of the traverse arm 71, for example. The traverse arm 71 performs reciprocating rotational motion while holding the yarn 20 by the yarn guide section, thereby enabling the yarn 20 to traverse. Further, a guide plate 28 is provided slightly upstream of the traverse position. The guide plate 28 guides the yarn 20 on the upstream side to the traverse portion. With the above configuration, the yarn 20 unwound from the yarn supplying bobbin 21 can be wound to form the package 30.

Next, a case of controlling winding of the yarn 20 using the package diameter will be described with reference to fig. 3. Fig. 3 is a diagram illustrating a process of controlling the traverse width based on the control package diameter.

As described above, the unit control section 51 can calculate the package diameter by performing calculation based on the detection values of the various sensors. In the automatic winder 1, various control values are calculated based on the package diameter. Hereinafter, the package diameter for performing such control is referred to as a "control package diameter". In contrast, the package diameter calculated from the detection values of the various sensors is referred to as "calculated package diameter". The calculated package diameter is also referred to as a value obtained by performing noise removal or statistical processing (for example, moving average) on the calculated package diameter.

Further, the calculated package diameter may become an inappropriate value due to noise or the like. Therefore, in the present embodiment, the control value is calculated based on the calculated package diameter without directly calculating the control value using the calculated package diameter, and the control value is calculated based on the calculated package diameter. Further, the control package diameter is updated at any time based on the calculated package diameter.

In the present embodiment, the traverse width is controlled to be changed based on the control package diameter. Specifically, as shown in fig. 3, the traverse width is reduced as the diameter of the control package increases, and control is performed to produce a package 30 having a tapered end face. For example, in the case of using the calculated package diameter in the control, it is considered that the calculated package diameter is decreased by the influence of noise or the like, and then the calculated package diameter is increased. In this case, since the traverse width is once increased and then decreased again, the yarn 20 is guided to a portion where no yarn layer exists, and a jump may occur.

Therefore, in the present embodiment, the unit control unit 51 updates the control package diameter based on the calculated package diameter, and does not reduce the control package diameter. That is, when the calculated package diameter is smaller than the control package diameter, the unit control section 51 does not change the control package diameter. In addition, in order to prevent a sudden increase in the control package diameter, an upper limit (hereinafter, an increase threshold) is set on the increase amount of the control package diameter at the time of updating. In addition, when the diameter of the control package increases rapidly, the end face of the package 30 takes a deformed shape because the state in which the diameter of the control package does not change continues for a while thereafter. Further, since the influence of the increase in the control package diameter varies depending on the yarn thickness or the control package diameter, the increase threshold value is not a constant value but a variable value. Specifically, the smaller the yarn thickness, the smaller the increase speed of the control package diameter, and therefore the influence of the increase of the control package diameter becomes relatively large. Similarly, the larger the control package diameter is, the smaller the increase speed of the control package diameter is (the smaller the increase rate of the control package diameter is), and therefore the influence of the increase of the control package diameter becomes relatively large. Therefore, in the present embodiment, the smaller the yarn thickness or the larger the control package diameter, the smaller the increase threshold value is.

The calculation of the increase threshold and the process of updating the control package diameter using the increase threshold will be described below with reference to fig. 4 and 5. Fig. 4 is a flowchart showing a process of updating the control package diameter based on the increase threshold. Fig. 5 is a diagram showing a correspondence relationship between the yarn thickness and the package diameter for control and the increase threshold value.

First, the unit control section 51 calculates the yarn thickness based on the set yarn count (S101). When the yarn 20 is wound, for example, an operator usually operates the machine input section 91, and the machine control device 90 stores the yarn count. The unit control section 51 calculates the yarn thickness based on the yarn count. As a method of calculating the yarn thickness from the yarn number, for example, a function or the like may be used, or a table in which a relationship between a representative yarn number and yarn thickness is registered in advance may be used. Instead of the unit control unit 51 calculating the yarn thickness based on the set yarn count, the machine control device 90 may calculate the yarn thickness based on the set yarn count, and the machine control device 90 may collectively transmit the calculated values to the unit control unit 51.

Next, the unit control unit 51 calculates an initial increase threshold, which is an increase threshold at the time of the minimum package diameter, based on the yarn thickness calculated in step S101 (S102). The minimum package diameter is the smallest control package diameter in the process of changing the increase threshold value based on the control package diameter. For example, the minimum package diameter is the control package diameter (i.e., the diameter of the winding tube 22) at the start of winding the yarn 20. The minimum package diameter is a predetermined fixed value, and the same value can be used even if the yarn count is different. The minimum package diameter may be different depending on the change of the winding conditions. The initial increase threshold is calculated by a function or table or the like having the yarn thickness as a variable. As shown in fig. 4, as the initial increasing threshold value, a value that increases as the yarn thickness becomes thicker is calculated.

Next, the unit control section 51 calculates a maximum package diameter, which is a control package diameter when the increase threshold becomes the minimum increase threshold, based on the yarn thickness (S103). In the present embodiment, as shown in fig. 5, a minimum increase threshold and a maximum increase threshold are set in advance. In the present embodiment, the minimum increase threshold and the maximum increase threshold are applied regardless of the yarn thickness or the package diameter for control. Therefore, the cell control unit 51 increases the threshold value even if the minimum increase threshold value is not less than the maximum increase threshold value. The increase threshold decreases as the control package diameter increases, and a certain control package diameter later coincides with the minimum increase threshold. The control package diameter at the time of the matching is the maximum package diameter. The maximum package diameter is calculated by a function or a table using the yarn thickness as a variable. As shown in fig. 5, as the trend of the maximum package diameter, a value that increases as the yarn thickness becomes thicker is calculated.

Next, the unit control section 51 determines whether or not the maximum package diameter calculated in step S103 is larger than the minimum package diameter (S104). When the maximum package diameter is equal to or smaller than the minimum package diameter, the unit control unit 51 sets the increase threshold to the maximum increase threshold (S105). The processing in steps S101 to S103 is calculated based on a value that does not depend on the current control package diameter. Therefore, the increase threshold can always be set to be the maximum increase threshold regardless of the current control package diameter as long as the winding is continued under the same condition.

When the maximum package diameter is larger than the minimum package diameter, the unit control section 51 calculates a current increase threshold of the control package diameter based on a straight line passing through the two points (S106). The two points are the point calculated in step S102 (minimum package diameter, initial increase threshold value) and the point calculated in step S103 (maximum package diameter, minimum increase threshold value). Thus, as shown in fig. 5 (particularly, a portion between the minimum package diameter and the maximum package diameter), the correspondence relationship (linear equation ) between the control package diameter and the increase threshold value is calculated. Therefore, the unit control unit 51 calculates the increase threshold value by an equation in which the current package diameter for control is input to the straight line. The slope of the straight line may be different or the same depending on the yarn thickness.

Next, the unit control section 51 determines whether or not the increase threshold calculated in step S106 is smaller than the minimum increase threshold (S107). When the increase threshold is smaller than the minimum increase threshold, the unit control unit 51 sets the minimum increase threshold as the increase threshold used at the present time (S108). In fig. 5, the increase threshold value always indicates a portion at the minimum increase threshold value in a portion larger than the maximum package diameter. When the increase threshold calculated in step S106 is larger than the minimum increase threshold, the calculated increase threshold is set as the increase threshold at the current time.

Next, the unit control unit 51 subtracts the control package diameter from the calculated package diameter to calculate the increased diameter (S109). The increase diameter is a package diameter increased by the winding of the yarn 20, and is preferably added to the control package diameter, and is preferably prevented from increasing rapidly as described above. In addition, when the diameter of the control package is larger than the calculated package diameter due to noise or the like, the calculation result becomes negative, and therefore the increased diameter cannot be calculated. In this case, the update of the control package diameter at the current time is suspended.

Next, the unit control section 51 determines whether or not the increase diameter calculated in step S109 is larger than the increase threshold set to be used at the current time (S110). When the increase diameter is equal to or smaller than the increase threshold, the unit control unit 51 updates the control package diameter by matching the control package diameter with the calculated package diameter, without a sudden increase (S111). When the increasing diameter ratio is larger than the increasing threshold, the unit control section 51 updates the control package diameter by adding the current control package diameter to the increasing threshold (S112).

After updating the control package diameter, the unit control unit 51 performs the processing of step S104 and the subsequent steps again after a predetermined time. Thus, the control package diameter is updated to substantially follow the calculated package diameter. Further, control related to winding of the yarn 20 is performed based on the updated control package diameter. As described above, the update can be performed so that the control package diameter is prevented from rapidly increasing and the control package diameter is increased.

As described above, the automatic winder 1 according to the above embodiment includes the winding unit 18, the detection unit (the yarn length detection sensor 15 and the package rotation sensor 47), and the unit control unit 51, and performs the following yarn winding method. The winding unit 18 winds the yarn 20 to form a package 30. The detection unit detects values (yarn running speed, rotation speed of the package 30) used for calculating the package diameter. The unit control section 51 calculates a calculated package diameter, which is a package diameter based on the value detected by the detection section (calculation step). The unit control section 51 updates the control package diameter, which is the package diameter used for controlling the winding of the yarn 20, based on the calculated increase in the package diameter (updating step). The unit control section 51 calculates an increase threshold that varies based on at least one of the yarn thickness and the control package diameter (calculation step). When the value obtained by subtracting the control package diameter from the calculated package diameter exceeds the increase threshold value, the unit control unit 51 increases the control package diameter by an amount corresponding to the increase threshold value.

Thus, by providing the increase threshold value for updating the control package diameter, it is possible to prevent the content of control of the wound yarn 20 from changing abruptly. In particular, the influence of updating the control package diameter differs depending on the yarn thickness or the control package diameter. Therefore, by setting the increase threshold based on the above, the control package diameter can be updated appropriately.

In the automatic winder 1 according to the above embodiment, the minimum increase threshold and the maximum increase threshold are set in the increase thresholds calculated by the unit control unit 51. The cell control unit 51 calculates the increase threshold so as to be equal to or higher than the minimum increase threshold and so as to be equal to or lower than the maximum increase threshold.

This prevents the increase threshold from being excessively small or large, and therefore, the control package diameter can be updated more appropriately.

In the automatic winder 1 according to the above embodiment, the unit control section 51 calculates an increase threshold value that changes based on both the yarn thickness and the control package diameter.

Thus, the threshold value changes based on both the two values regarding the magnitude of the influence of the update of the control package diameter, so the control package diameter can be updated more appropriately.

In the automatic winder 1 according to the above-described embodiment, the unit control section 51 calculates the initial increase threshold, which is the increase threshold applied when the control package diameter is the smallest, based on the yarn thickness.

This makes it possible to calculate the initial increase threshold value by a simple process.

In the automatic winder 1 according to the above embodiment, the unit control section 51 calculates the control package diameter (maximum package diameter) when the increase threshold matches the minimum increase threshold based on the yarn thickness.

Thus, the control package diameter when the increase threshold value matches the minimum increase threshold value can be calculated by a simple process.

In the automatic winder 1 according to the above-described embodiment, the unit control unit 51 calculates the correspondence relationship between the increase threshold and the control package diameter based on the initial increase threshold, the control package diameter (minimum package diameter) at the time of the initial increase threshold, the minimum increase threshold, and the control package diameter (maximum package diameter) at the time of the minimum increase threshold. The correspondence relationship includes a portion in which the increase threshold value linearly changes according to an increase in the diameter of the control package.

Thus, the correspondence relationship between the increase threshold and the control package diameter can be calculated by a simple process of obtaining two points on the coordinate axis and obtaining a straight line passing through the two points.

In the automatic winder 1 according to the above embodiment, the unit control section 51 calculates the increase threshold value based on at least the yarn thickness. The minimum increase threshold is constant regardless of the yarn thickness.

This eliminates the need for calculation processing of the minimum increase threshold value corresponding to the yarn thickness, and therefore, the processing becomes simple.

In the automatic winder 1 according to the above-described embodiment, the unit control section 51 calculates the yarn thickness based on the input yarn number, and calculates the increase threshold based on the calculated yarn thickness. In another embodiment, the machine station control device 90 may calculate the yarn thickness based on the set yarn count and transmit the calculated value to the cell control unit 51.

This eliminates the need for the operator to directly input the yarn thickness, and thus reduces the operator's trouble. In addition, when the machine table control device 90 transmits the yarn thickness to the unit control section 51, the work of the operator can be reduced.

In the automatic winder 1 according to the above-described embodiment, even when the calculated package diameter is smaller than the control package diameter, the unit control section 51 does not perform the process of reducing the control package diameter and does not change the control package diameter.

This prevents the winding from being controlled to be inappropriate as the diameter of the control package decreases.

While the preferred embodiments of the present invention have been described above, the above configuration can be changed as follows, for example.

In the above embodiment, the relationship between the control package diameter and the increase threshold is linear. Alternatively, as shown in fig. 6, the relationship between the control package diameter and the increase threshold value may be nonlinear (a curve when plotted on a line graph). Specifically, the curve is preferably convex downward (the side on which the increase threshold is small), and more specifically, an inversely proportional curve is more preferable.

In the above embodiment, the unit control section 51 performs the process of updating the control package diameter. Alternatively, the machine control device 90 or another control device may perform the above-described processing.

As a configuration for calculating the package diameter, an angle sensor for detecting the angle of the cradle 23 (the rotation angle about the rotation axis 48) may be used. The angle sensor is constituted by, for example, a rotary encoder, and transmits an angle signal corresponding to the angle of the cradle 23 to the unit control unit 51. Since the angle of the cradle 23 changes according to the package 30 being roughly wound, the angle can be detected by the angle sensor and calculated to determine the calculated package diameter. As a detecting section for determining the calculated package diameter, a sensor for detecting the rotation speed of the contact roller 29 can be used. In particular, in the case of a bobbin package having an equal diameter in the winding axial direction, since the rotation speed of the touch roller 29 is similar to the peripheral speed of the package, the calculated package diameter can be obtained by performing the same processing as in the above embodiment.

As the detection unit for calculating the package diameter, a timer capable of measuring the elapsed time may be used. In this case, the temporal change in the thickness of the yarn layer is determined in advance by calculation or an empirical value based on the winding conditions. Then, the thickness of the yarn layer is determined based on the determined value and the measured elapsed time. Then, the thickness of the yarn layer is added to the diameter of the winding tube 22, and the calculated package diameter is calculated. In addition, the timer can measure the elapsed time considering the time when the winding is interrupted by the cut yarn or the broken yarn.

In the above embodiment, the yarn thickness is calculated based on the set yarn number, but the yarn thickness may be input by the operator and the unit control section 51 may recognize the yarn thickness.

In the above embodiment, both the change of the increase threshold value based on the yarn thickness and the change of the increase threshold value based on the control package diameter are performed, but either one may be omitted.

Instead of directly rotating the package 30 by the package driving motor 41, the package 30 may be driven to rotate by the rotation of the contact roller 29.

The present invention is not limited to an automatic winder, and can be applied to other yarn winders such as a winder and a spinning machine (for example, an air spinning machine and a free end spinning machine).

Description of reference numerals

1 … automatic winder

15 … yarn length detecting sensor (detecting part)

18 … reel-up

30 … roll

47 … Package rotation sensor (detection part)

51 … Unit control part (control part)

90 … machine control device (control device).