JP4024377B2 - Yarn switching winder and winding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread switching winder and a winding method for winding a continuously supplied thread, and more particularly to an apparatus for continuously supplying a thread such as a spinning take-up apparatus for synthetic fibers. The present invention relates to a thread-switching winder and a winding method suitable for the above.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 2-276771 discloses a winding device for continuously fed yarns, in which a rotatable bobbin revolver is provided, and two winding spindles are supported on the bobbin revolver. A switching device and a contact roller are provided in front of the bobbin revolver when viewed in the yarn traveling direction, and the outer peripheral surface of the contact roller is aligned with the outer peripheral surface of the bobbin formed on one winding spindle in the working position. The winding process according to the bobbin diameter, which is in contact and the distance between the shaft of the contact roller and the shaft of the winding spindle in the working position increases gradually during the winding process as the bobbin revolver rotates. In a type adapted to change in, the contact roller is supported on a support, the support being in a winding spool with the contact roller in the working position. It is configured to be movable so as to perform a stroke motion with a component force in a radial direction relative to the handle, and a predetermined force acts on the contact roller in the motion direction of the support, A bobbin revolver is connected to the rotary drive device, and the rotary drive device drives the bobbin revolver to increase the distance between the axis of the contact roller and the axis of the take-up spindle in the working position, A rotation driving device is connected to a sensor and a rotation control device via an adjustment circuit, the sensor detects a stroke movement of the contact roller, and the rotation driving device detects a deviation between a target position and an actual position of the contact roller. In response, the winding device is opened, characterized in that the sensor controls the position of the contact roller in the adjusting circuit so that it remains substantially unchanged during the winding process. It is.
[0003]
Japanese Patent Application Laid-Open No. 8-290870 discloses a bobbin position adjusting method for a winder that adjusts the bobbin position as the winding diameter of the winding package increases. A bobbin position adjusting method for a winder characterized by adjusting a bobbin position based on a value, a rotation detecting means for detecting a bobbin rotational speed, a bobbin moving means for moving a bobbin holder along a predetermined path, A bobbin position of a winder comprising: an arithmetic control unit that calculates a winding diameter from a bobbin rotational speed detected by the rotation detection unit and appropriately operates the bobbin moving unit based on the calculated value An adjustment device is disclosed.
[0004]
[Problems to be solved by the invention]
In the yarn switching winder described in the above-mentioned Japanese Patent Application Laid-Open No. 2-27671, during winding of the yarn, the turret table is always moved so that the bobbin holder is separated from the contact roller so that the position of the contact roller does not change. It is made to rotate.
[0005]
That is, in this prior art, the position of the contact roller is not changed, and after the thread is switched, the turret is rotated so that the position of the bobbin holder is separated from the contact roller. Is configured to do. When automating the doffing of the package, the package is taken out from the bobbin holder by a doffer (doffing machine). However, this conventional technique has a problem that the above-described automation is difficult and the doffer is complicated because the wound package is constantly moving.
[0006]
Further, in the winding machine described in Japanese Patent Laid-Open No. 8-290870, at the time of switching, since the moving distance from the position before switching to contact with the empty bobbin is large, the contact roller is empty from the position before switching. There is a problem that a long distance is required to move to the contact position with the bobbin, and the time required for switching is long, so that waste yarns during switching work increase or the switching success rate decreases.
[0007]
OBJECT OF THE INVENTION
In the present invention, there is a problem that automation associated with the yarn switching winder described in the above-mentioned Japanese Patent Laid-Open No. 2-276771 is difficult, and that the doffer becomes complicated, and Japanese Patent Laid-Open No. 8-290870 discloses. It is an object of the present invention to provide a yarn switching winder and a winding method that can solve the problem of increased waste yarns and reduced switching success rate associated with the winder described.
[0008]
[Means for Solving the Problems]
According to the present invention, a bobbin is mounted on two bobbin holders that are rotatably provided on a turret table that is rotatably attached to a machine frame, and a contact roller is pressed against the yarn wound on the bobbin to thereby provide a yarn. When the yarn wound on one bobbin holder reaches a predetermined amount, the bobbin holder is switched to the other bobbin holder sequentially, and the winding side of the bobbin holder is wound according to the winding thickness of the package. In a yarn winding and winding machine in which the turret table is rotated so that the distance between the bobbin holder and the contact roller is large,
From the beginning of winding the yarn until reaching a predetermined initial condition set in advance, the turret table is fixed at a predetermined position, and the contact roller is moved from the winding start position to a position where the package is thickened. The bobbin holder is wound so that the contact roller returns to the winding start position after reaching the predetermined initial condition until reaching the winding diameter (D _max ) before yarn switching. The above-mentioned object is achieved by a winding method of a yarn-switching winder, wherein the turret table is controlled to rotate in a direction to retract from a contact roller.
[0009]
In the present invention, the initial condition may be the time from the start of winding the yarn until the predetermined winding time T elapses, or the predetermined condition may be the predetermined winding diameter (D ₁ ) of the winding package. Good. Furthermore, the switching winder includes doffing means, and the initial condition may be a doffing completion signal transmitted from the doffing means.
[0010]
According to the present invention, until the winding package reaches a predetermined winding amount such as a predetermined winding diameter (D ₁ ), a time until a predetermined winding time T elapses from the start of winding the yarn, Since the turret table is fixed until a predetermined initial condition is satisfied, such as when a doffing completion signal is transmitted from the frying means, it is possible to easily take out the full-package and insert the empty bobbin easily.
[0011]
Further, according to the present invention, before the switching turret is started, the contact roller is returned to the position L _S where the empty bobbin and the contact roller are in contact with each other, so that the contact roller is in contact with the empty bobbin when the bobbin is switched. No waiting time is required to return to, the rotation speed of the turret table can be increased, and the switching time can be shortened, so that the switching success rate can be improved and the waste yarn is reduced.
[0012]
The yarn switching winder according to the present invention for carrying out the method for winding and winding according to the present invention is, as described in claim 5, 2 rotatably projecting on a turret table that is rotatably mounted on the machine frame. A bobbin is attached to a bobbin holder, a contact roller is pressed against a thread wound on the bobbin, the thread is wound, and when the thread wound on one bobbin holder reaches a predetermined amount, the other thread is wound. A thread that is sequentially switched to a bobbin holder, and that the turret table is rotated so that the distance between the bobbin holder on the winding side and the contact roller is increased according to the winding thickness of the package wound on the one bobbin holder. In the change-over winder
Setting means for setting a predetermined initial condition, detection means for detecting a state from the start of winding of the yarn of the yarn switching winding machine, a state detected by the detection means, and an initial condition set by the setting means, And a control means for controlling the rotation of the turret table and the movement of the contact roller. The control means determines that the comparison means has reached the predetermined initial condition from the start of winding the yarn. In the meantime, the turret table is fixed at a predetermined position, and the contact roller is moved from the winding start position to a position where the package is rolled up to wind up the yarn. before such that the contact roller before reaching the front of the winding diameter (D _max) switching the yarn from after it is determined to have reached the initial condition is restored to the winding-start position It may be characterized in that the bobbin holder is controlled so as to rotate the turret table in a direction of retracting from the contact roller.
In addition, as described in claim 6, the bobbin is mounted on two bobbin holders that are rotatably provided on a turret table that is rotatably mounted on the machine frame, and contacts with the yarn wound on the bobbin. When the yarn wound around one bobbin holder reaches a predetermined amount, the roller is brought into pressure contact with the other bobbin holder so that the yarn is sequentially switched to the other bobbin holder and the package wound around the one bobbin holder is wound. In the yarn switching winder that rotates the turret table so that the distance between the bobbin holder on the winding side and the contact roller increases according to the thickness,
Setting means for setting a predetermined initial winding time from the start of winding of the yarn, detection means for detecting the winding time from the start of winding of the yarn of the yarn switching winder, winding detected by the detection means Comparing means for comparing the take-up time with a predetermined initial take-up time set by the setting means, and control means for controlling the rotation of the turret table and the movement of the contact roller. From the beginning until the comparison means determines that the predetermined initial winding time has been reached, the turret table is fixed at a predetermined position, and the contact roller is wound from the winding start position to the position where the package rolls up. the moved by winding the yarn, then, the co until the comparison means reaches a yarn before switching winding diameter (D _max) from later determined to have reached the predetermined initial winding time May be yarn switching winder, characterized in that the tact roller is controlled such that the bobbin holder so as to return to the winding start position to rotate the turret table in a direction of retracting from the contact roller.
[0013]
Further, according to the present invention, as described in claim 7, the bobbin is mounted on two bobbin holders rotatably provided on a turret table rotatably attached to the machine frame, and the yarn wound on the bobbin. The contact roller is pressed against the strip to wind up the yarn, and when the yarn wound on one bobbin holder reaches a predetermined amount, it is sequentially switched to the other bobbin holder and wound onto the one bobbin holder. The turret table is rotated so that the distance between the bobbin holder on the winding side and the contact roller is increased according to the winding of the package, and doffing means is provided for doffing the wound package after the turret table is rotated. In yarn winding and winding machine,
The yarn switching winder includes a sending means for sending a doffing completion signal when a dampening package is doffed and a control means for controlling the rotation of the turret table and the movement of the contact roller. The control means fixes the turret table at a predetermined position from the start of winding the yarn until the sending means dries the package wound by the doffing means and sends a doffing completion signal. At the same time, the contact roller is moved from the winding start position to the position where the package is thickened to wind the yarn, and then the comparison means determines that the predetermined initial condition has been reached before the yarn switching. the bobbin holder as winding diameter (D _max) of the contact roller to reach is returned to the winding-start position is retracted from the contact roller Be controlled so as to rotate the turret table to direction may be yarn switching winder according to claim.
[0014]
Further, according to the present invention, as described in claim 8, the bobbin is attached to two bobbin holders that are rotatably provided on a turret table that is rotatably attached to the machine frame, and the yarn wound on the bobbin. The contact roller is pressed against the strip to wind up the yarn, and when the yarn wound on one bobbin holder reaches a predetermined amount, it is sequentially switched to the other bobbin holder and wound onto the one bobbin holder. In the yarn switching winder that rotates the turret table so that the gap between the bobbin holder on the winding side and the contact roller is increased according to the winding thickness of the package,
Setting means for setting a predetermined initial package winding diameter, detection means for detecting the winding diameter of the package formed on the bobbin, package winding diameter detected by the detection means, and predetermined initial package winding set by the setting means Comparing means for comparing the diameter and control means for controlling the rotation of the turret table and the movement of the contact roller, the control means from a winding start winding diameter (D ₀ ) to a predetermined winding diameter (D ₁ ), the turret table is fixed at a predetermined position, and the contact roller is moved from the winding start position to a position where the package is wound to the predetermined winding diameter (D ₁ ) to wind the yarn. taken, then, the contact roller from after the winding diameter of the package reaches the predetermined winding diameter (D ₁₎ until it reaches the winding diameter (D _max) before switching yarn The bobbin holder so as to return to the winding start position can also be a yarn switching winder being characterized in that so as to rotate the turret table in a direction of retracting from the contact roller.
[0015]
In this case, according to the present invention, the bobbin is mounted on two bobbin holders that are rotatably provided on the turret table that is rotatably attached to the machine frame as described in claim 9, and is wound on the bobbin. A contact roller is pressed against the yarn to wind the yarn, and when the amount of yarn wound on one bobbin holder reaches a predetermined amount, the other bobbin holder is sequentially switched and the one bobbin holder is wound. In the yarn-switching winder configured to rotate the turret table so that the distance between the bobbin holder on the winding side and the contact roller is increased according to the winding thickness of the package,
Setting means for setting a predetermined initial package winding diameter, detection means for detecting the winding diameter of the package formed on the bobbin, package winding diameter detected by the detection means, and predetermined initial package winding set by the setting means Comparing means for comparing the diameter and control means for controlling the rotation of the turret table and the movement of the contact roller, the control means from a winding start winding diameter (D ₀ ) to a predetermined winding diameter (D ₁ ), the turret table is fixed at a predetermined position, and the contact roller is moved from the winding start position to a position where the package winding diameter is increased to the predetermined winding diameter (D ₁ ). Winding the strip, during which the learning speed of the package is increased while the contact roller is retracted from the bobbin holder. Between after reaching the serial predetermined winding diameter (D ₁₎ until the maximum winding diameter before switching yarn (D _max) is calculated subsequent winding fat rate based on the speed of the fat winding and the learned The contact roller returns from the position of the contact roller when contacted with the package having the predetermined winding diameter (D ₁ ) to the position of the contact roller when contacted with the package at the start of winding of the yarn (D ₀ ). As described above, it is preferable to provide a yarn switching winder in which the bobbin holder rotates the turret table in a direction in which the bobbin holder is retracted from the contact roller. In the present invention, a computer is used as the control means, and the turret table and the contact roller are controlled by the control means as described in each claim.
[0016]
【Example】
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment of the present invention in which a predetermined winding diameter (D ₁ ) of a winding package is selected as an initial condition. FIG. 1 is a front view of a switching winder according to one embodiment of the present invention, and FIGS. 1A to 1E show the winding procedure in the switching winder of this embodiment in time series. Show.
[0017]
The machine casing 1 is placed on the base 9. A turret table 2 is attached to the machine frame 1 so as to be rotatable around a horizontal axis, and the turret table 2 is rotated by a turret table rotation motor (not shown).
[0018]
Two bobbin holders 3 and 4 are rotatably provided on the turret table 2, and a plurality of bobbins 5 and 6 are mounted on the bobbin holders 3 and 4, respectively. Each of the bobbin holders 3 and 4 is rotationally driven by a bobbin holder rotating motor (not shown).
[0019]
In FIG. 1, a frame 10 is projected from the machine frame 1 on the upper left side of the turret table 2, and a slide frame 11 is slidably supported on the frame 10 via a support member 12. The support member 12 includes a slide bearing including a housing 14 and a slide shaft 13 that are fixed to the vicinity of the center of the slide frame 11 in the vertical direction. A contact roller 7 is rotatably supported by the slide frame 11. Further, a traverse device 8 that traverses the yarn in a direction perpendicular to the paper surface of FIG. 1 is provided on the slide frame 11 at a position above the contact roller 7.
[0020]
In the embodiment shown in FIG. 1, the contact roller 7 is always pressed against the bobbin 6 inserted in the bobbin holder 4, and the rotation speed of the contact roller 7 is detected so that the rotation speed becomes a predetermined value. The rotational speed of the bobbin holder rotation motor that drives the bobbin holder 4 is controlled by a computer (not shown). The computer (control means) includes a setting means for setting a predetermined winding diameter D _1, it is possible to set a predetermined reel diameter from the winding start of the yarns.
[0021]
An operating transformer (not shown) of a known type is attached between a slide frame 11 that supports the contact roller 7 and a frame 10 attached to the machine frame. The operating transformer engages with the slide frame 11 and the frame 10, detects the relative position of the contact roller 7 with respect to the frame 10, and transmits the position of the contact roller 7 during winding of the yarn to the computer. The working transformer of this embodiment is also means for detecting the winding diameter of the bobbin formed on the bobbin attached to the bobbin holder. Further, the computer (control means) includes a comparing means for comparing whether the winding diameter of the package is detected by a differential transformer (detection means) therein has reached a predetermined initial winding diameter D _1.
[0022]
Next, the winding procedure of the present embodiment will be described with reference to the drawings. Fig.1 (a) has shown the state when winding of a yarn is started.
[0023]
In the state where the yarn starts to be wound, the yarn is traversed by the traversing device 8 in a state where the turret table 2 is fixed (that is, the rotation is stopped), and the traversed yarn is traversed on the bobbin 6. To form a package. The bobbin 6 is mounted on the bobbin holder 4, and the yarn is printed on the contact roller 7 and then wound on the bobbin 6 pressed against the contact roller 7. Vertical distance between the rotation center and the center of rotation of the turret table 2 of the contact roller 7 L _s is input to the computer as described above.
[0024]
The winding of the yarn is continued from the above state. At this time, (see winding start - predetermined winding diameter D _1), as shown in FIG. 2, the turret table 2 is still fixed state (rotation stopped state), the upper bobbin 6 yarn is attached to the bobbin holder 4 The contact roller 7 ascends along the slide bearing (comprising the housing 14 and the slide shaft 13 as described above) as the package P becomes thicker. In this case, comparison means winding diameter of the package has been detected by a differential transformer (detection means) is compared whether reached a predetermined initial winding diameter D _1.
[0025]
Package until the determination comparison unit that has reached the package diameter D ₁ of the predetermined amount, the contact roller 7 is raised to the direction A to the position of the rising edge near the ,, slide shaft 13. When the contact roller 7 starts to rise, the relationship between the moving distance of the contact roller 7 from the yarn winding start position and the elapsed time from the yarn winding start point is determined by the above-described operating transformer (bobbin winding diameter). Is measured and input to a computer.
[0026]
The measurement of the relationship between the time from the start of winding of the yarn and the amount of movement of the contact roller is once finished when the contact roller moves a predetermined amount to a position corresponding to the package diameter D _{1 due} to the thickening of the package. Shows this state in FIG. 1 (b), the vertical distance between the rotation center and the center of rotation of the turret table 2 of the contact roller 7 when this is L _1.
[0027]
Next, the relationship between the time measured as described above (hereinafter referred to as “time when the measurement is performed”) and the movement amount measured as described above (hereinafter referred to as “the measured movement amount”). Is used to calculate (predict) the moving position of the contact roller 7 with respect to the package to be wound after that until a preset complete winding time.
[0028]
In this example,
("Preset winding time"-"Measurement time") / "Measured travel"
And the relationship between the passage of time after the package diameter reaches D ₁ and the position of the contact roller is determined (predicted) by calculation in the computer.
[0029]
Next, from the above-described computer, the position of the actual contact roller coincides with the position (reference value) of the contact roller determined in the computer over time after the package D ₁ in this way. The turret table 2 is gradually rotated in the direction C as shown in FIG. By repeating this operation, the contact roller 7 gradually descends in the B direction.
[0030]
As a result, as shown in FIG. 2 (see winding diameter D ₁ to complete winding), both the rotation speed of the turret table 2 and the lowering speed of the contact roller 7 are controlled, and the package diameter shown in FIG. The distance L ₁ from the actual rotation center of the turret table 2 to the rotation center of the contact roller 7 between the time point D _{1 and} the time point when reaching the maximum winding diameter D _max shown in FIG. The distance L _F from the center of rotation of the turret table 2 to the center of rotation of the contact roller 7 is calculated as follows. Here, the distance L _F is selected to be equal to the distance L _S from the rotation center of the turret table 2 at the start of winding to the rotation center of the contact roller 7.
[0031]
When the package diameter reaches the winding diameter (D _max ) before thread switching, the turret table 2 is rotated in the C direction (see complete winding to winding start in FIG. 2), and the winding of the thread is mounted on the bobbin holder 4 The bobbin 6 is switched to the bobbin 5 attached to the bobbin holder 3 in a known direction (see FIG. 1 (d) and the complete winding in FIG. 2).
[0032]
Next, the package P wound around the bobbin holder 3 on the winding side is wound up in the same manner as described above, and the bobbin holder 4 on the reserve side is reached until the position of the contact roller 7 reaches the position shown in FIG. The package P formed above is taken out (doffed) from the bobbin holder 4, and then an empty bobbin is mounted on the bobbin holder 4. Thereafter, the process is repeated in the above order.
[0033]
While evenly placed the movement of the package diameter D ₁ after the contact roller 7 at the take-up time in this embodiment may be equal arranged relative to the reel diameter.
[0034]
In this embodiment, an operating transformer is used as a measuring device for the distance traveled by the contact roller 7 and a means for detecting the winding diameter of the bobbin formed on the bobbin mounted on the bobbin holder. However, a known measuring device such as an encoder is used. May be used.
[0035]
In this embodiment, the operation transformer is used to detect the position of the contact roller. However, a detection device such as a limit switch is attached to the lower limit position and the upper limit position of the contact roller to detect the position, and program control is performed during that time. May be.
[0036]
In this embodiment, the bobbins 5 and 6 and the contact roller 7 are brought into contact with each other at the beginning of winding of the yarn. However, a slight gap is provided between the bobbins 3 and 4 and the contact roller 7 at the beginning of winding. You may do it.
[0037]
In the embodiment described above, the predetermined winding diameter (D ₁ ) of the winding package is selected as the initial condition. However, the present invention provides a predetermined winding diameter (D ₁ ) of the winding package as the initial condition as in this embodiment. In addition to selecting D ₁ ), it may be the time from the start of winding the yarn until the predetermined winding time T elapses, or the transmission of a doffing completion signal from the doffing means.
[0038]
【The invention's effect】
According to the present invention, until the winding package reaches a predetermined winding amount such as a predetermined winding diameter (D ₁ ), a time until a predetermined winding time T elapses from the start of winding the yarn, Since the turret table is fixed until a predetermined initial condition is satisfied, such as when a doffing completion signal is transmitted from the frying means, it is possible to easily take out the full-package and insert the empty bobbin easily.
[0039]
Further, according to the present invention, before the switching turret is started, the contact roller is returned to the position L _S where the empty bobbin and the contact roller are in contact with each other, so that the contact roller is in contact with the empty bobbin when the bobbin is switched. No waiting time is required to return to, the rotation speed of the turret table can be increased, and the switching time can be shortened, so that the switching success rate can be improved and the waste yarn is reduced.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a front view of a switching winder according to one embodiment of the present invention, and (a) to (e) show winding procedures in the switching winder of this embodiment in time series. .
FIG. 2 is a time chart showing the relationship between the movement of the turret table and the contact roller in the embodiment shown in FIG.
[Explanation of symbols]
9 Base 1 Machine frame 2 Turret table 3 Bobbin holder 4 Bobbin holder 5 Bobbin 6 Bobbin 10 Frame 12 Support member 11 Slide frame 14 Housing 13 Slide shaft D ₀ Winding diameter D ₁ predetermined winding diameter D _max maximum winding diameter

Claims (9)

A bobbin is mounted on two bobbin holders that are rotatably provided on a turret table that is rotatably mounted on the machine frame, and a contact roller is pressed against the yarn wound on the bobbin to wind the yarn. When the yarn wound on one bobbin holder reaches a predetermined amount, the bobbin holder on the winding side and the contact on the winding side are sequentially switched to the other bobbin holder according to the thickness of the package wound on the one bobbin holder. In the yarn changeover winder that rotates the turret table so that the interval between the rollers is increased,
From the beginning of winding the yarn until reaching a predetermined initial condition set in advance, the turret table is fixed at a predetermined position, and the contact roller is moved from the winding start position to a position where the package is thickened. The bobbin holder is wound so that the contact roller returns to the winding start position after reaching the predetermined initial condition until reaching the winding diameter (D _max ) before yarn switching. A winding method for a yarn-switching winder, wherein the turret table is controlled to rotate in a direction to retract from a contact roller. The winding method of the yarn switching winder according to claim 1, wherein the initial condition is a time from when the yarn starts to wind until a predetermined winding time T elapses. 2. The yarn-switching winding according to claim 1, wherein the switching winder includes doffing means, and the initial condition is transmission of a doffing completion signal from the doffing means. Winding method of the machine. Yarn switching winder winding method according to claim 1, wherein the initial condition is a predetermined winding diameter (D ₁₎ of the winding package. A bobbin is mounted on two bobbin holders that are rotatably provided on a turret table that is rotatably mounted on the machine frame, and a contact roller is pressed against the yarn wound on the bobbin to wind the yarn. When the yarn wound on one bobbin holder reaches a predetermined amount, the bobbin holder on the winding side and the contact on the winding side are sequentially switched to the other bobbin holder according to the thickness of the package wound on the one bobbin holder. In the yarn changeover winder that rotates the turret table so that the interval between the rollers is increased,
Setting means for setting a predetermined initial condition, detection means for detecting a state from the start of winding of the yarn of the yarn switching winding machine, a state detected by the detection means, and an initial condition set by the setting means, And a control means for controlling the rotation of the turret table and the movement of the contact roller. The control means determines that the comparison means has reached the predetermined initial condition from the start of winding the yarn. In the meantime, the turret table is fixed at a predetermined position, and the contact roller is moved from the winding start position to a position where the package is rolled up to wind up the yarn. before such that the contact roller before reaching the front of the winding diameter (D _max) switching the yarn from after it is determined to have reached the initial condition is restored to the winding-start position Bobbin holder yarn switching winder and controls so as to rotate the turret table in a direction of retracting from the contact roller. A bobbin is mounted on two bobbin holders that are rotatably provided on a turret table that is rotatably mounted on the machine frame, and a contact roller is pressed against the yarn wound on the bobbin to wind the yarn. When the yarn wound on one bobbin holder reaches a predetermined amount, the bobbin holder on the winding side and the contact on the winding side are sequentially switched to the other bobbin holder according to the thickness of the package wound on the one bobbin holder. In the yarn changeover winder that rotates the turret table so that the interval between the rollers is increased,
Setting means for setting a predetermined initial winding time from the start of winding of the yarn, detection means for detecting the winding time from the start of winding of the yarn of the yarn switching winder, winding detected by the detection means Comparing means for comparing the take-up time with a predetermined initial take-up time set by the setting means, and control means for controlling the rotation of the turret table and the movement of the contact roller. From the beginning until the comparison means determines that the predetermined initial winding time has been reached, the turret table is fixed at a predetermined position, and the contact roller is wound from the winding start position to the position where the package rolls up. the moved by winding the yarn, then, the co until the comparison means reaches a yarn before switching winding diameter (D _max) from later determined to have reached the predetermined initial winding time Yarn switching winder, characterized in that the tact roller is controlled such that the bobbin holder so as to return to the winding-start position is rotating the turret table in a direction of retracting from the contact roller. A bobbin is mounted on two bobbin holders that are rotatably provided on a turret table that is rotatably mounted on the machine frame, and a contact roller is pressed against the yarn wound on the bobbin to wind the yarn. When the yarn wound on one bobbin holder reaches a predetermined amount, the bobbin holder on the winding side and the contact on the winding side are sequentially switched to the other bobbin holder according to the thickness of the package wound on the one bobbin holder. In the yarn changeover winder including the doffing means for rotating the turret table so that the interval between the rollers is increased, and doffing the thick package after the rotation of the turret table,
The yarn switching winder includes a sending means for sending a doffing completion signal when a dampening package is doffed and a control means for controlling the rotation of the turret table and the movement of the contact roller. The control means fixes the turret table at a predetermined position from the start of winding the yarn until the sending means dries the package wound by the doffing means and sends a doffing completion signal. At the same time, the contact roller is moved from the winding start position to the position where the package is thickened to wind the yarn, and then the comparison means determines that the predetermined initial condition has been reached before the yarn switching. the bobbin holder as winding diameter (D _max) of the contact roller to reach is returned to the winding-start position is retracted from the contact roller Switching winder yarn, characterized by controlling so as to rotate the turret table to direction. A bobbin is mounted on two bobbin holders that are rotatably provided on a turret table that is rotatably mounted on the machine frame, and a contact roller is pressed against the yarn wound on the bobbin to wind the yarn. When the yarn wound on one bobbin holder reaches a predetermined amount, the bobbin holder on the winding side and the contact on the winding side are sequentially switched to the other bobbin holder according to the thickness of the package wound on the one bobbin holder. In the yarn changeover winder that rotates the turret table so that the interval between the rollers is increased,
Setting means for setting a predetermined initial package winding diameter, detection means for detecting the winding diameter of the package formed on the bobbin, package winding diameter detected by the detection means, and predetermined initial package winding set by the setting means Comparing means for comparing the diameter and control means for controlling the rotation of the turret table and the movement of the contact roller, the control means from a winding start winding diameter (D ₀ ) to a predetermined winding diameter (D ₁ ), the turret table is fixed at a predetermined position, and the contact roller is moved from the winding start position to a position where the package is wound to the predetermined winding diameter (D ₁ ) to wind the yarn. taken, then, the contact roller from after the winding diameter of the package reaches the predetermined winding diameter (D ₁₎ until it reaches the winding diameter (D _max) before switching yarn The bobbin holder yarn switching winder being characterized in that so as to rotate the turret table in a direction of retracting from the contact roller so as to return to the winding start position. A bobbin is mounted on two bobbin holders that are rotatably provided on a turret table that is rotatably mounted on the machine frame, and a contact roller is pressed against the yarn wound on the bobbin to wind the yarn. When the yarn wound on one bobbin holder reaches a predetermined amount, the bobbin holder on the winding side and the contact on the winding side are sequentially switched to the other bobbin holder according to the thickness of the package wound on the one bobbin holder. In the yarn changeover winder that rotates the turret table so that the interval between the rollers is increased,
Setting means for setting a predetermined initial package winding diameter, detection means for detecting the winding diameter of the package formed on the bobbin, package winding diameter detected by the detection means, and predetermined initial package winding set by the setting means Comparing means for comparing the diameter and control means for controlling the rotation of the turret table and the movement of the contact roller, the control means from a winding start winding diameter (D ₀ ) to a predetermined winding diameter (D ₁ ), the turret table is fixed at a predetermined position, and the contact roller is moved from the winding start position to a position where the package winding diameter is increased to the predetermined winding diameter (D ₁ ). Winding the strip, during which the contact roller learns the winding speed of the package while retracting against the bobbin holder;
From the time when the package winding diameter reaches the predetermined winding diameter (D ₁ ) until the maximum winding diameter (D _max ) before the yarn switching is reached, the subsequent winding is based on the learned winding speed. The weighting speed is calculated, and the position of the contact roller when contacting the package of the predetermined winding diameter (D ₁ ) to the position of the contact roller when contacting the package of the yarn winding start (D ₀ ) A yarn change winding machine, wherein the turret table is rotated in a direction in which the bobbin holder is retracted from the contact roller so that the contact roller returns.

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