JP2007153608A - Winder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in a contact drum type winder that an actual thread speed becomes an unexpected speed even if a rotation speed of a drum is controlled based on detection of the number of revolution of the drum so as to control the thread speed. <P>SOLUTION: A winding unit 1 is provided with a traverse drum 10 rotating in contact with a winding package 4 and interlockingly rotating the winding package 4; and a drum driver 11 for rotatably driving the traverse drum 10. The winding unit 1 is provided with a thread speed sensor 7 for detecting an instantaneous value of the thread speed, i.e., a running speed of the thread wound on the winding package 4; and a sequencer 12 for calculating a traverse average value of the thread speed from the instantaneous value of the thread speed and setting an instruction value of a rotation speed of the drum to control the drum driver 11 such that the traverse average value of the thread speed is coincident with a target value of the thread speed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a winder comprising a drum that rotates in contact with a package and rotates the package in conjunction with the drum driver that rotates the drum.

  2. Description of the Related Art Conventionally, a winder that winds a thread on a bobbin to form a package is known as a contact drum type. That is, the rotation driving means of the package is a drum that rotates in contact with the package and rotates the package in conjunction with the package (Patent Document 1).

JP-A-5-246619

  FIG. 4 shows a drum 10 and a cone winding package 4 in a contact drum type winder. Here, the cone winding means that the bobbin 13 is a cone (conical truncated cylinder), and the package 4 formed on the bobbin 13 is a truncated cone shaped cylindrical body.

The package 4 rotates by receiving a rotational driving force from the drum 10 by contacting the drum 4. The package 4 substantially contacts the drum 10 at a driving point P that is one point in the axial direction, and receives a rotational driving force from the drum 10 at the driving point P. Further, since the package 4 has a cone shape, the diameter changes in the axial direction. If the position of the package 4 in the axial direction is different, the outer peripheral length of the package 4 at that position is also different. For this reason, the package 4 does not receive the rotational driving force of the drum 10 from two different points in the axial direction, and always receives the rotational driving force only from the driving point P that is one point in the axial direction.
The position of the driving point P varies depending on the change in the center of gravity of the package 4. For this reason, as the diameter of the package 4 increases and the weight of the package 4 increases, the axial direction of the package 4 moves to the larger diameter side. Then, the outer peripheral length of the package 4 at the driving point P is gradually increased, and the rotational speed of the package 4 is gradually decreased even if the rotational speed of the drum is constant.

FIG. 2 illustrates how the traveling speed (hereinafter, yarn speed) of the yarn wound around the cone-wound package changes as the package winding diameter changes.
As shown in FIG. 2A, the drum rotates at a constant rotational speed, and its peripheral speed Vd is constant. On the other hand, as shown in FIG. 2B, the yarn speed is larger than the peripheral speed Vd at the stage where the package winding diameter is small (winding start side) and at the stage where the package winding diameter is large (winding end side). It is smaller than the drum speed Vd.

Conventionally, since it was considered that the yarn speed was proportional to the rotational speed of the drum, it was considered that the yarn speed could be calculated by detecting the rotational speed of the drum. However, as shown in FIG. 2, the actual yarn speed is not proportional to the rotational speed of the drum.
Therefore, even if the drum rotation speed is controlled to be within a predetermined value or a predetermined range based on detection of the drum rotation speed, the yarn speed itself is not controlled, and the actual yarn speed is Sometimes the speed was unexpected. When the yarn speed becomes an unexpected speed, there is a possibility that the quality of the yarn itself may be affected, for example, the winding tension may be unexpected.

  In other words, the problem to be solved is that, in a contact drum type winder, even if the drum rotation speed is controlled based on detection of the drum rotation speed in order to control the yarn speed, the actual yarn speed is unexpected. It was the point that sometimes became speed.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

The winder according to claim 1 is:
A drum that rotates in contact with the package and rotates the package in conjunction with the package;
A drum driver for rotating the drum;
A winder comprising:
Yarn speed detecting means for detecting the yarn speed, which is the traveling speed of the yarn wound around the package;
A controller for controlling the drum driver by setting a command value for the rotational speed of the drum so that the detected value of the yarn speed matches the target value of the yarn speed;
It is provided.

The shape of the package may be not only a cone shape but also a cheese shape.
The yarn speed detecting means does not ask whether it is a contact type or a non-contact type.

The above configuration has the following effects.
The yarn speed is kept in a state that matches the yarn speed target value.

A winder according to a second aspect is the following structure according to the first aspect.
The target value of the yarn speed is a predetermined constant value.

The above configuration has the following effects.
The yarn speed is kept in a state that matches a predetermined constant value.

A winder according to a third aspect of the present invention has the following configuration according to the first or second aspect.
The drum is a traverse drum in which traverse grooves are formed on the outer peripheral surface of the drum.

  As effects of the present invention, the following effects can be obtained.

In claim 1,
The yarn speed can be appropriately controlled.

In claim 2, in addition to the effect of claim 1,
By keeping the yarn speed constant, the yarn can be wound around the package in a state where no tension difference occurs between the yarns wound around the package. For this reason, the package shape becomes good, the unwinding speed at the time of unwinding becomes uniform, and the quality of the yarn is improved. Furthermore, since the yarn speed does not fluctuate, the yarn speed can always be set to the maximum speed possible with a winder, leading to improved production efficiency.

In claim 3, in addition to the effect of claim 1 or claim 2,
There is no need to install a traverse device for traversing, and the device configuration is simplified.

  An embodiment of the present invention will be described.

The automatic winder will be described with reference to FIG.
This automatic winder is a device that forms a winding package 4 having a predetermined shape by rewinding a yarn supplying package 2 produced by a spinning machine or the like. This automatic winder includes a large number of winding units 1 that are responsible for rewinding a single spindle.
As shown in FIG. 1, in the winding unit 1, a yarn supplying package 2 is arranged at the lower part, and a winding package 4 is arranged at the upper part. The winding unit 1 includes an unwinding assist device 5, a variable tension device 6, a yarn splicing device 9, a yarn speed sensor 7, a yarn defect along a traveling path of the yarn 3 from the yarn supply package 2 to the winding package 4. A detection device 8 and a traverse drum 10 are arranged.
The winding unit 1 is also provided with a drum driver 11 that rotationally drives the traverse drum 10 and a sequencer 12 that commands the drum driver 11 to control the rotational drive of the traverse drum 10.

The unwinding assisting device 5 is a device that controls the unwinding balloon that is generated when the yarn 3 is unwound in the axial direction from the yarn supply package 2.
The unwinding assisting device 5 is a drive that lowers the umbrella-shaped cylindrical member 51 covering the bobbin 21 of the yarn supplying package 2 and the interval δ between the cylindrical member 51 and the chess portion of the yarn supplying package 2 while maintaining a substantially constant distance δ. And a mechanism 52. The tubular member 51 is controlled so that the balloon diameter at the time of unwinding is substantially constant, so that the unwinding does not increase even when the unwinding progresses.

The variable tension device 6 is a device that applies a variable winding tension to the yarn 3 unwound from the yarn supply package 2.
The variable tension device 6 increases or decreases the amount of engagement between the fixed comb teeth 61 and the movable comb teeth 62 that are alternately arranged at positions facing each other across the yarn traveling path of the yarn 3 and the comb teeth 61 and 62. And a drive mechanism 63 such as a solenoid.
The variable tension device 6 is controlled by a control signal from the sequencer 12 so that the amount of engagement of the movable comb teeth 62 with respect to the fixed comb teeth 61, that is, the degree of zigzag bending of the yarn traveling path is controlled. The winding tension is controlled sequentially.

The yarn speed sensor 7 is a non-contact type device that detects the traveling speed (yarn speed) of the yarn 3.
This yarn speed sensor 7 is provided with a plurality of optical yarn thickness detection devices along the yarn traveling direction, and based on the output signal of the yarn thickness detecting means at different positions in the yarn traveling direction, a spatial filter system Is used to detect the traveling speed of the yarn 3.
This optical thread thickness detecting device includes a light receiving element and a light source. The amount of light received by the light receiving element changes in accordance with the thread thickness of the thread 3 at a position passing through the detection position of the thread thickness detection means, and an electrical signal corresponding to the thread thickness detects this thread thickness. Output from the device.

The yarn defect detection device 8 is a device that cuts the yarn 3 when a yarn defect such as a slab is detected on the yarn 3.
The yarn defect detection device 8 includes a yarn thickness detection device 81 that detects the thickness of the passing yarn 3, a yarn defect determination device 82 that determines whether the yarn thickness is a yarn defect, and a yarn defect. And a yarn cutting device 83 that cuts the yarn 3 when it is determined that. During winding, the yarn thickness of the yarn 3 passing through the yarn thickness detection device 81 is input to the yarn defect determination device 82 as an electrical signal. The yarn defect determination device 82 compares this yarn thickness electrical signal with a reference value, and if it exceeds the allowable range, it is determined that the yarn defect portion has passed, and the yarn cutting device 83 immediately cuts the yarn. The command signal is output. Then, the yarn cutting device 83 operates to forcibly cut the yarn.
Further, along with this yarn cutting, the yarn running signal from the yarn thickness detecting device 81 is turned off, and the yarn defect determining device 82 detects the yarn breakage, and sends a stop signal of the traverse drum 10 to the drum via the sequencer 12. This is transmitted to the driver 11 and the rotation of the traverse drum 10 is stopped.
The yarn thickness detecting device 81 provided in the yarn defect detecting device 8 also includes a light receiving element and a light source. Then, an electrical signal corresponding to the thread thickness is output from the thread thickness detection device.

  The yarn splicing device 9 is a device that splics the lower yarn of the yarn supplying package 2 and the upper yarn of the winding package 4. When the yarn breakage occurs due to the yarn cutting or the like in the yarn defect detecting device 8, the yarn 3 is separated into the upper yarn and the lower yarn. Therefore, the yarn joining device 9 joins the yarn 3 and winds it onto the winding package 4. Resume returning. Here, when the yarn traveling signal from the yarn thickness detection device 81 is turned off, the yarn defect determination device 82 is connected via the sequencer 12 to operate the yarn splicing device 9 after the operation of the yarn cutting device 82. A yarn joining command signal is transmitted to the yarn joining device 9.

The yarn splicing device 9 includes an air nozzle device 91 that entangles the upper and lower yarn fibers by air flow, and a lower yarn suction device 92 that sucks and captures the lower yarn and guides it to the air nozzle device 91. An upper thread suction device 93 that sucks and captures the upper thread and guides the upper thread to the air nozzle device 91.
The lower thread suction device 92 has a suction pipe for sucking and capturing the yarn 3 as a main body, and a suction port 92a at the tip of the suction pipe is configured to be rotatable around a shaft 92b at the end of the suction pipe. The suction port 92 a moves between the air nozzle device 91 and the upper position of the unwinding assisting device 5 by the vertical rotation of the suction tube. The upper thread suction device 93 has the same configuration, and has a suction tube for sucking and capturing the yarn 3 as a main body, and a suction port 93a at the distal end of the suction tube is configured to be rotatable around a shaft 93b at the distal end of the suction tube. Has been. The suction port 93 a moves between the air nozzle device 91 and the peripheral surface of the winding package 4 by the vertical rotation of the suction tube.

Here, when forced yarn cutting is performed by detecting the yarn defect in the yarn defect detecting device 8, the upper yarn is wound by the winding package 4, and the lower yarn is based on the yarn splicing command signal. The suction port 92 a is captured by the lower thread suction device 92 that has been waiting at the upper position of the unwinding assisting device 5.
Next, the upper thread is captured by the upper thread suction device 93 that has caused the suction port 93 a to stand by on the peripheral surface of the winding package 4 based on the yarn splicing command signal.
Thereafter, the lower thread suction device 92 moves the suction port 92a upward to guide the lower thread to the air nozzle device 91, and the upper thread suction device 93 moves the suction port 93a downward to move the upper thread to the air nozzle. In the air nozzle device 91, the upper thread and the lower thread are spliced together.
After this yarn splicing operation, the rotational drive of the traverse drum 10 is resumed by a command from the sequencer 12, and winding is performed again.

The traverse drum 10 is a device that traverses the yarn 3 around the winding package 4.
More specifically, the traverse drum 10 has a function of moving the yarn 3 in the axial direction of the winding package 4 (traverse means) and rotating the winding package 4 so that the yarn 3 is placed on the winding package 4. And a winding function (winding means).
The function as the winding means is realized by forming the traverse drum 10 into a cylindrical rotating body. The traverse drum 10 is disposed such that the outer peripheral surface thereof is in contact with the outer peripheral surface of the winding package 4. By rotating the traverse drum 10 in this state, the winding package 4 rotates in conjunction with the traverse drum 10.
The function as traverse means is realized by a groove (traverse groove) 10 a for guiding the yarn 3 formed on the outer peripheral surface of the traverse drum 10. The groove is formed so as to be displaced in the axial direction of the traverse drum 10 along the circumferential direction of the traverse drum 10. The yarn 3 guided in the groove 10 a is swung in the axial direction of the traverse drum 10 as the traverse drum 10 rotates.

  The apparatus for traversing the yarn 3 around the winding package 4 is not limited to the traverse drum 10 integrally provided with the traverse means and the winding means, but as an apparatus as the traverse means and the winding means. The apparatus may be provided as a separate body. For example, the traverse means may be a device that swings the yarn guide in the axial direction of the winding package 4, and the winding means may be a simple cylindrical rotating body (drum) having no yarn guide groove.

The winding package 4 is a package formed by cone winding.
The bobbin 13 of the winding package 4 is a cone (conical truncated cone). Since the yarn 3 is wound on the outer peripheral surface of the bobbin 13 while being traversed, the winding diameter of the yarn 3 is uniform in the axial direction of the bobbin 13. For this reason, the winding package 4 wound and formed on this bobbin 13 becomes cone winding.

The bobbin 13 is supported by a cradle arm (not shown) so that the outer peripheral surface of the winding package 4 (bobbin 13) is always in contact with the outer peripheral surface of the traverse drum 10. The cradle arm changes the support position of the bobbin 13 in accordance with an increase in the winding diameter of the winding package 4 formed on the bobbin 13.
Since the winding package 4 and the bobbin 13 are cones, the bobbin 13 is attached to the cradle arm so that the lower end of the outer peripheral surface of the winding package 4 (bobbin 13) is parallel to the upper end of the outer peripheral surface of the traverse drum 10. It is supported. The entire lower end of the outer peripheral surface of the winding package 4 (bobbin 13) is kept in contact with the entire upper end of the outer peripheral surface of the traverse drum 10. Here, the bobbin 13 is arranged above the traverse drum 10.

The drive point P (the substantial contact point between the winding package 4 and the traverse drum 10) will be described.
When the traverse drum 10 is stationary, the entire lower end of the winding package 4 (bobbin 13) and the entire upper end of the traverse drum 10 are in contact with each other. That is, the outer peripheral surfaces of the winding package 4 and the traverse drum 10 are in line contact with each other.
On the other hand, in a state where the traverse drum 10 is rotationally driven, the outer peripheral surfaces of the winding package 4 and the traverse drum 10 are substantially in a point contact state at only one point. This point contact position is defined as a driving point P. That is, the winding package 4 (bobbin 13) is applied with the rotational force of the traverse drum 10 substantially only at the driving point P.

  The winding package 4 (bobbin 13) is given the rotational force only at the driving point P for the following reason. Since the winding package 4 (bobbin 13) has a cone shape, the outer peripheral length differs in the axial direction of the winding package 4 (bobbin 13). On the other hand, the peripheral speed applied from the traverse drum 10 is the same regardless of the axial position of the winding package 4 (bobbin 13). However, when the same peripheral speed is given to the parts of the winding package 4 (bobbin 13) in different axial positions, the outer peripheral lengths are different, and thus different rotational speeds are given. If the shape of the winding package 4 (bobbin 13) is stable, the rotational speed of the winding package 4 cannot be different at different positions in the axial direction. Therefore, substantially, the rotational force of the traverse drum 10 is transmitted to the winding package 4 (bobbin 13) only at one point (driving point P) in the axial direction of the winding package 4 (bobbin 13). Become.

This drive point P is the balance center position of the winding package 4 (bobbin 13) in contact with the traverse drum 10. The balance center position is determined by the position of the center of gravity of the winding package 4 (bobbin 13) and the magnitude of the supporting force with which the cradle arm supports both shaft ends of the bobbin 13.
Here, the position of the center of gravity of the winding package 4 (bobbin 13) is displaced to the larger diameter side due to the increase of the winding diameter due to the extension of winding of the yarn 3.
For this reason, the drive point P moves to the large-diameter side of the winding package 4 as indicated by an arrow A (FIG. 1) as the winding diameter of the winding package 4 increases.

The problem when the rotational speed of the traverse drum 10 is constant will be described with reference to FIG.
Here, for reference, a description will be given of a case where the rotational speed of the traverse drum 10 is constant regardless of changes in the winding diameter of the winding package 4. When the rotational speed of the traverse drum 10 is constant, there is a problem that the yarn speed is not constant.
In order to prevent this problem, the winding unit 1 is provided with a yarn speed control mechanism 15 capable of controlling the yarn speed to be constant. The yarn speed control mechanism 15 will be described later.

FIG. 2A shows the relationship between the peripheral speed of the traverse drum 10 and the winding diameter. This peripheral speed Vd is indicated by a thick solid line. This peripheral speed Vd is a constant value.
FIG. 2B shows the relationship between the traveling speed (yarn speed) of the yarn 3 and the winding diameter. An average value of the yarn speed (traverse average value described later) is indicated by a thick broken line, and an upper limit and a lower limit of an instantaneous value of the yarn speed that vibrates above and below this average value are indicated by a thin broken line. The yarn speed sensor 7 described above detects an instantaneous value of the yarn speed.
2A and 2B, the horizontal axis is the major axis of the winding diameter of the winding package 4, and the vertical axis is the speed axis that is the yarn speed or the circumferential speed.

Although the rotational speed of the traverse drum 10 is illustrated in FIG. 2 (a) instead of the rotational speed, the speed corresponding to the yarn speed is not the rotational speed of the traverse drum 10, but the traverse speed. This is the peripheral speed of the swing drum 10. The circumferential speed of the traverse drum 10 is determined by the rotational speed of the traverse drum 10 and the diameter of the traverse drum 10.
Further, since the winding diameter of the winding package 4 increases with time, the horizontal axis in FIGS. 2A and 2B is also a time axis schematically.

When the peripheral speed (rotational speed) of the traverse drum 10 is constant as shown in FIG. 2A, the yarn speed is increased as shown in FIG. Gradually decreases.
In the present embodiment, this yarn speed is larger than the constant peripheral speed of the traverse drum 10 at the winding start stage (the stage where the winding diameter is small) of the winding package 4, and the winding end stage of the winding package 4. At the stage where the winding diameter is large, the circumferential speed of the traverse drum 10 is smaller.
That is, the yarn speed varies according to the change in the winding diameter of the winding package 4.

  As described above, when the yarn speed changes due to a change in the winding diameter of the winding package 4, the yarn 3 is wound around the winding package 4 with a tension difference. If it does so, the deterioration of a package shape and the fall of yarn unwinding property will be caused. In addition, if the yarn speed varies, the allowable speed of each device (unwinding assisting device 5, variable tension device 6, etc.) arranged on the yarn traveling path is limited in accordance with the upper limit value of the yarn speed. Will be. That is, it is necessary to configure each device arranged on the yarn traveling path so that it can withstand a higher speed than the average yarn speed from the start to the end of winding. This is the above-mentioned problem that occurs when the yarn speed is not constant.

Here, the factors that determine the yarn speed will be described.
The yarn speed is roughly proportional to the rotational speed of the winding package 4.
This is because the yarn 3 is wound on the winding package 4 and is pulled and travels on the yarn traveling path in the winding unit 1. In the winding unit 1, the driving means for running the yarn 3 is only the traverse drum 10 that rotates the winding package 4.
When the rotational speed of the traverse drum 10 is constant, the rotational speed of the winding package 4 changes due to the displacement of the driving point P described above.

The rotational speed of the winding package 4 decreases as the drive point P is displaced to the larger diameter side as the winding diameter increases. This is due to the following reason.
When the rotational speed of the traverse drum 10 is constant, the peripheral speed of the traverse drum 10 is also constant. Further, as described above, the traverse drum 10 and the winding package 4 are substantially in contact with each other only at the driving point P. The winding package 4 is given a constant peripheral speed from the traverse drum 10 at the driving point P. When the circumferential speed of the traverse drum 10 is constant and the driving point P moves to the larger diameter side of the winding package 4, the outer peripheral length of the winding package 4 at the driving point P increases, and the winding package 4. The time required for one rotation increases. That is, the rotational speed of the winding package 4 decreases due to the displacement of the drive point P toward the large diameter side. Furthermore, the increase in the winding diameter itself increases the outer peripheral length of the winding package 4 uniformly.
For this reason, as the winding diameter of the winding package 4 increases, the displacement of the drive point P to the larger diameter side and the increase in the winding diameter itself both lead to an increase in the outer peripheral length. This contributes to a reduction in the rotation speed. FIG. 2 (b) reflects the above situation.

The yarn speed will be described in more detail with reference to FIG.
Since the yarn 3 is wound around the winding package 4 by traverse winding, the instantaneous value of the yarn speed varies in the traverse cycle (traverse cycle). The fluctuation range of the yarn speed is within the range of the upper and lower thin broken lines shown in FIG. This is due to the following reason.
The instantaneous value of the yarn speed is approximately equal to the peripheral speed of the winding package 4 at the position where the yarn 3 is actually wound. In the winding package 4 having a cone, even if the rotation speed of the winding package 4 is constant, if the axial position of the winding package 4 is different, the peripheral speed of the winding package 4 is different. Moreover, since the yarn 3 is wound around the winding package 4 by traverse winding, the position where the yarn 3 is wound on the winding package 4 changes every moment.
Further, when traverse winding is performed, the yarn 3 is swung in the axial direction of the winding package 4, and therefore the path length of the yarn 3 from the traverse drum 10 to the winding package 4 varies, thereby causing the yarn 3 to move. Is stretched or slackened. Due to this influence, the instantaneous value of the yarn speed is deviated from the peripheral speed of the winding package 4 at the winding position.

  The fluctuations in the yarn speed due to the traverse winding as described above are small enough to be ignored compared with the influence of the fluctuations in the yarn speed due to the displacement of the drive point P. Therefore, not the instantaneous value of the yarn speed, but the average value of the traverse of the yarn speed obtained by averaging the instantaneous values in the traverse winding cycle (traverse cycle) is considered as an object affected by the variation in the winding diameter of the winding package 4. That's fine.

A yarn speed control mechanism 15 for controlling the yarn speed will be described with reference to FIG.
In the description of the yarn speed control mechanism 15, the yarn speed means an average traverse value of the yarn speed unless otherwise specified.
The yarn speed control mechanism 15 is a mechanism that controls the yarn speed so as to follow the target value of the yarn speed. In the yarn speed control mechanism 15, by setting the target value of the yarn speed to a constant value, the yarn speed is controlled to be constant regardless of the change in the winding diameter in order to prevent the change in the yarn speed due to the change in the winding diameter described above. Is possible.
The yarn speed control mechanism 15 includes a traverse drum 10 that travels the yarn 3, a drum driver 11 that rotationally drives the traverse drum 10, a sequencer 12 that is a control device that controls the rotational speed of the traverse drum 10, A yarn speed sensor 7 for detecting an instantaneous value of the yarn speed.
The sequencer 12 calculates a traverse average value of the yarn speed from the instantaneous value of the yarn speed detected by the yarn speed sensor 7, and traverses the drum through the drum driver 11 so that the traverse average value becomes a predetermined target value. 10 rotational drive is controlled.
The drum driver 11 includes a drive motor 11a that rotationally drives the traverse drum 10, and an inverter 11b that changes the output of the drive motor 11a.

The sequencer 12 will be described in more detail.
The sequencer 12 is a computer device, and includes an arithmetic device 12a that performs data processing based on a program, and a storage device 12b that stores data and the program. Further, the yarn speed sensor 7 and the drum driver 11 are connected to each other via an input / output device provided in the sequencer 12 so that signals can be transmitted.

The calculation of the traverse average value of the yarn speed in the sequencer 12 will be described.
Since the output signal of the yarn speed sensor 7 is a signal corresponding to the instantaneous value of the yarn speed, the sequencer 12 calculates the traverse average value of the yarn speed.
The storage device 12b of the sequencer 12 stores rotational speed information of the traverse drum 10 that also functions as a traverse means in time series. The arithmetic unit 12a calculates a traverse cycle at the current time point from the rotational speed information. Next, the arithmetic unit 12a calculates the average traverse value of the yarn speed by averaging the instantaneous value of the yarn speed transmitted from the yarn speed sensor 7 in this traverse cycle.

In the above, the yarn speed sensor 7 and the sequencer 12 constitute yarn speed (traverse average value) detection means.
The yarn speed sensor 7 constitutes a means for detecting an instantaneous value of the yarn speed.
The sequencer 12 constitutes a speed averaging means for calculating a traverse average value of the yarn speed obtained by averaging the instantaneous value of the yarn speed with the traverse cycle.
The time width that averages the instantaneous value of the yarn speed is not limited to the time width of one cycle of the traverse cycle (this embodiment), and may be a time width that is a constant multiple of the traverse cycle.

Strictly speaking, the instantaneous value of the yarn speed cannot be obtained using the yarn speed sensor 7. This is because the time width required for detecting the yarn speed changes according to the yarn speed.
When using the spatial filter system, the magnitude of the frequency used as a material for determining the yarn speed changes according to the yarn speed, and the time required for detecting the yarn speed changes. Even when an encoder is used, the time required for detecting the yarn speed changes depending on the yarn speed, because the transmission interval of pulses used as the yarn speed judgment material changes.
However, the time width required for detecting the yarn speed is the time for the fixed point of the yarn 3 to pass through the yarn speed sensor 7 and is very small compared to the traverse cycle. Can be regarded as an instantaneous value of the yarn speed.

The sequencer 12 compares the detected value of the yarn speed with the target value of the yarn speed stored in the storage device 12b. The storage device 12b stores a yarn speed target value set as a constant value. This target value can be changed via an input device to the sequencer 12.
The sequencer 12 controls the rotation speed of the traverse drum 10 so that the detected value of the yarn speed matches the target value of the yarn speed. This rotational speed control is performed by changing / maintaining the rotational speed command value of the traverse drum 10 with respect to the previous command value.
Specifically, when the detected value of the yarn speed exceeds the target value of the yarn speed, the sequencer 12 sets the command value for the rotational speed of the traverse drum 10 so that the rotational speed of the traverse drum 10 is decreased. Set lower than the command value. On the contrary, when the detected value of the yarn speed is lower than the target value of the yarn speed, the sequencer 12 changes the command value of the rotational speed of the traverse drum 10 to the previous command so as to increase the rotational speed of the traverse drum 10. Set higher than the value. Further, when the detected value of the yarn speed matches the target value of the yarn speed, the sequencer 12 uses the same command value for the rotational speed of the traverse drum 10 as before so as to maintain the rotational speed of the traverse drum 10. Set to.

Further, the winding unit 1 is provided with an encoder 16 as a rotational speed detection device as means for obtaining a detected value of the rotational speed of the traverse drum 10. A detection value (detection value of the rotational speed of the traverse drum 10) detected by the encoder 16 is transmitted to the sequencer 12.
The sequencer 12 determines whether or not the detected value of the rotational speed of the traverse drum 10 matches the command value of the rotational speed of the traverse drum 10, and whether or not there is an abnormality in the operation of the drum driver 11. To monitor. The detected value of the rotational speed of the traverse drum 10 itself is not used for the yarn speed target value tracking control by the sequencer 12.

A change in the yarn speed and the rotational speed of the traverse drum 10 when the yarn speed is controlled to be constant by the yarn speed control mechanism 15 will be described with reference to FIG.
FIG. 3A shows the relationship between the peripheral speed of the traverse drum 10 and the winding diameter. This peripheral speed is indicated by a thick solid line. This peripheral speed is controlled so as to increase as the winding diameter increases.
FIG. 3B shows the relationship between the yarn speed and the winding diameter. The average value V (traverse average value) of the yarn speed is indicated by a thick broken line, and the upper and lower limits of the instantaneous value of the yarn speed that vibrates above and below this average value are indicated by a thin broken line. The yarn speed sensor 7 described above detects an instantaneous value of the yarn speed.
3A and 3B, the horizontal axis is the major axis of the winding diameter of the winding package 4, and the vertical axis is the speed axis that is the yarn speed or the circumferential speed.
Further, since the winding diameter of the winding package 4 increases with time, the horizontal axis in FIGS. 3A and 3B is also a time axis schematically.

When the yarn speed is controlled to be constant as shown in FIG. 3 (b), the circumferential speed (rotational speed) of the traverse drum 10 gradually increases as the winding diameter increases as shown in FIG. 3 (a). I will do it.
In the present embodiment, this peripheral speed is smaller than the constant yarn speed at the winding start stage (winding diameter is small) of the winding package 4, and the winding end stage (winding diameter is large) of the winding package 4. In stage), it is greater than the yarn speed.

FIG. 3C shows an enlarged view of a part of FIG.
As shown in FIG. 3A, the circumferential speed of the traverse drum 10 has a stepped waveform as shown in FIG. 3C while gradually increasing as a whole.
This is because in the yarn speed control mechanism 15, the command value of the rotational speed of the traverse drum 10 is changed by the sequencer 12 in units of traverse cycle T. Since the setting (change / maintenance) of the rotational speed command value is performed based on the average traverse value of the yarn speed, it is performed following the calculation timing of the average traverse value of the yarn speed.

  In the above description, the case where the yarn speed control mechanism 15 controls the yarn speed target value to be a constant value and controls the actual yarn speed to a constant value has been described. You may set so that it may change with a diameter (time progress). Even when it is necessary to change the tension between the winding start and the winding end of the package, the yarn speed control mechanism 15 can be used to adjust the yarn speed according to the winding diameter.

It is a figure which shows the structure of a winder. It is a figure which shows the relationship between the yarn speed and winding diameter in the case of controlling the rotational speed of a drum uniformly. It is a figure which shows the relationship between the yarn speed in the case of controlling yarn speed uniformly, the peripheral speed of a drum, and a winding diameter. It is a figure which shows a cone winding package and a drum.

Explanation of symbols

1 Winder 3 Thread 4 Winding Package 7 Thread Speed Sensor 10 Traverse Drum 11 Drum Driver 12 Sequencer 15 Thread Speed Control Mechanism

Claims (3)

A drum that rotates in contact with the package and rotates the package in conjunction with the package;
A drum driver for rotating the drum;
A winder comprising:
Yarn speed detecting means for detecting the yarn speed, which is the traveling speed of the yarn wound around the package;
A controller for controlling the drum driver by setting a command value for the rotational speed of the drum so that the detected value of the yarn speed matches the target value of the yarn speed;
Comprising
A winder characterized by that. The yarn speed target value is a predetermined constant value,
The winder according to claim 1, wherein: The drum is a traverse drum in which traverse grooves are formed on the outer peripheral surface of the drum.
The winder according to claim 1 or 2, characterized by the above.

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