JP2008179434A - Twisting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of a multiple-spindle drive type traverse wherein it is apprehensive that a precision-winding package can not be formed by using a single-spindle drive type traverse (a type for separately driving each of twisting units), and to form a high-density package of multiple wound yarn. <P>SOLUTION: Each of the twisting units 2 is provided with a cradle arm 41, a drum 42 and a traverse motor 32. A twisting machine 1 for multiple-spindle driving the drum 42 with a line shaft 9 comprises a drum speed-of-rotation sensor 49, a package speed-of-rotation sensor 48 arranged per a twisting unit 2, and a unit controller 50 for computing winding speed and package diameter based on the diameter of the drum 42, the speed-of-rotation of the drum 42 and the speed-of-rotation of the winding package 6 per a twisting unit 2 and for controlling drive of the traverse motor 32 based on the winding speed and the package diameter so that the multiple wound yarn 7 is wound for precision-winding by the winding package 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a twisting machine in which a plurality of twisting units including a spindle device that twists spun yarn and a winding device that winds the twisted yarn to form a winding package are arranged.

  2. Description of the Related Art Conventionally, there is a twisting machine that winds synthetic fiber that does not break during winding (while the yarn feeding bobbin is wound on a winding package) by precision winding. Precision winding is performed by winding the yarn around the winding package by winding the yarn (winding direction in which the winding direction of the yarn is inclined with respect to the radial direction of the winding package). This is a winding method in which the number of windings from one end to the other end in the direction is constant. In precision winding, the traverse angle is precisely controlled and the yarn traveling paths on the winding package are closely aligned, so that a high-density winding package can be formed.

An example of such a twisting machine is disclosed in Patent Document 1. The twisting machine is a device that includes a plurality of twisting units that are responsible for rewinding a single yarn and simultaneously rewinds the plurality of yarns. In the twisting machine of Patent Document 1, a full spindle driving system (a system in which all the twisting units are driven all at once) is adopted as a driving system for the twisting unit.
JP 2006-188345 A

  In order to wind with precision winding, in order to make the number of winds constant, it is necessary to reduce the traverse speed (speed for swinging the yarn in the axial direction of the bobbin for traverse winding) as the package diameter increases. . That is, it is necessary to keep the relationship between the package diameter and the traverse speed constant. For this reason, in the case of a twisting machine that employs the full spindle drive system for traverse, it is necessary to always maintain a constant relationship between the package diameter and the traverse speed in all twist yarn units.

  However, due to the following causes, the relationship between the package diameter and the traverse speed in any of the twisting units collapses, and there is a variation in the relationship between the package diameter and the traverse speed that is desired to be uniform for all weights (all twisting units). Will occur. One cause is the occurrence of thread breakage. When yarn breakage occurs in any of the twisting units, the relationship between the package diameter and the traverse speed in the twisting unit is broken. Another cause is the occurrence of slipping of the winding package in the winding drum system. When the winding of the yarn around the winding package is performed by a winding drum that is rotated in contact with the winding package, a slip may occur between the winding drum and the winding package. When the winding package slips in any twisting unit, the relationship between the package diameter and the traverse speed in the twisting unit is broken.

  In a full-ply drive twisting machine that cannot individually drive the twisting unit, if the relationship between the package diameter and the traverse speed is disrupted by any twisting unit due to yarn breakage, in forming a precision winding winding package, The following actions must be taken. As a first countermeasure, when yarn breakage occurs in any of the twisting units, the driving of all the remaining twisting units is stopped, and the driving of all the twisting units is resumed when the yarn splicing is completed. In this case, since the driving of the entire twisting machine is stopped every time the yarn breaks, the productivity is lowered. As a second countermeasure, only the twisted yarn unit in which the yarn breakage has occurred is stopped, and driving of the remaining twisted yarn units is continued. In the case of this measure, a winding package whose generation is interrupted due to yarn breakage before full winding is wasted, leading to an increase in material loss.

  Further, regarding the occurrence of slip in any of the twisting yarn units, it is difficult to detect the occurrence of slip itself, and a defective winding package that is not precision winding is generated in the twisting yarn unit in which the slip has occurred. Even if the occurrence of slip can be detected, a full-ply drive twisting machine that cannot individually drive the twisting unit can only take the same measures as in the case of yarn breakage. In other words, taking the first or second countermeasure results in a decrease in productivity or an increase in material loss.

  Therefore, the traverse is a single spindle drive system (a system in which each twisting unit is driven independently) to solve the problem that precision winding winding cannot be achieved if the traverse is a full spindle drive system. It was decided to create a high-density yarn winding package.

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

The twisting machine according to claim 1,
A plurality of twisting units including a spindle device that twists the spun yarn and a winding device that winds the twisted yarn to form a winding package are arranged,
For each twisted yarn unit, a cradle arm that rotatably supports the winding package, a drum for contacting the winding package and rotating the winding package, and the combination wound on the winding package. A traverse motor that traverses the yarn by a traverse arm, and
A twisting machine configured to uniformly drive the drums of each twisting unit with all twisting units by a line shaft,
A drum rotation speed sensor for detecting the rotation speed of the drum;
A package rotation number sensor that is arranged for each twist yarn unit and detects the rotation number of the winding package;
For each twisted yarn unit, based on the diameter of the drum, the number of rotations of the drum, and the number of rotations of the winding package, the winding speed for winding the combined yarn around the winding package and the package diameter of the winding package And a control device for controlling the driving of the traverse motor based on the winding speed and the package diameter so that the combined yarn is wound around the winding package by precision winding,
It is provided.

A twisting machine according to a second aspect of the present invention has the following configuration according to the first aspect.
Instead of the precision winding, step precision winding is used.

According to a third aspect of the present invention, the twisting machine according to the first or second aspect has the following configuration.
In addition to the package rotation speed sensor, including an angle sensor for detecting the tilt angle of the cradle arm,
The control device calculates the package diameter based on the tilt angle.

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

In the invention according to claim 1,
The traverse becomes a single spindle driving system (a system in which each twisting unit is driven independently), and a winding package of precision winding combined yarns can be formed in all twisting units. Particularly for precision winding, it is possible to create a high-density wound package of combined yarns.

In the invention described in claim 2,
Traverse control is simple, and ribbon winding can be avoided as long as there is no problem with the quality of the winding package as a product.

In the invention of claim 3, in addition to the effect of claim 1 or claim 2,
The processing related to the calculation of the package diameter in the control device is simplified compared to the case where the processing is performed using the rotation number of the winding package.

  Embodiments of the present invention will be described with reference to the drawings.

The configuration of the twisting machine 1 will be described with reference to FIG.
The twisting machine 1 is an apparatus (synthetic yarn twisting machine) that forms a winding package 6 by winding the combined yarn 7 after twisting the combined yarn 7 obtained by combining a plurality of single yarns.
In the twisting machine 1, twisting units (weights) 2 that are in charge of yarn processing (twisting and rewinding) of a single piece of the combined yarn 7 are juxtaposed along one direction. Further, at one end of the twisted yarn units 2 in the juxtaposed direction, a total weight driving unit 3 for driving each twisted yarn unit 2 and a control unit 4 for controlling the total weight driving unit 3 are arranged. . The plurality of twisting units 2, the whole spindle driving unit 3, and the control unit 4 constitute a twisting machine 1.

In FIG. 2, the structure of the twist unit 2 is shown.
As shown in FIG. 2, the twisting unit 2 includes a spindle device 10, a yarn feeding device 20, a traverse device 30, and a winding device along a yarn path of the combined yarn 7 from the yarn supply package 5 to the winding package 6. 40 is provided. A unit controller 50 is also provided in the twisting unit 2 as a control means for controlling the driving of a spindle motor 11 (described later) of the spindle device 10 and a traverse motor 32 (described later) of the traverse device 30.
Then, the untwisted combined yarn 7 is unwound from the yarn supply package 5 and twisted by the spindle device 10 and then wound around the winding package 6 by the winding device 40. .

  The spindle device 10 is a means for twisting the combined yarn 7 unwound from the yarn supply package 5. The spindle device 10 is provided with a yarn supply package 5 as a supply source of the combined yarn 7, and a spindle motor as a driving means for adding twist to the combined yarn 7 unwound from the yarn supply package 5. 11 is provided.

The yarn feeding device 20 is means for feeding the combined yarn 7 from the spindle device 10 to the winding device 40.
The yarn feeding device 20 includes a yarn feeding roller 21 and a nip belt 22 disposed so as to contact the yarn feeding roller 21. The yarn feed roller 21 is driven in a state in which the yarn 7 is held by the yarn feed roller 21 and the nip belt 22, whereby the yarn 7 is fed from the spindle device 10 to the winding device 40. The yarn feeding device 20 may not include the nip belt 22.

The winding device 40 is means for winding the combined yarn 7 sent from the spindle device 10 onto the winding package 6.
The winding device 40 includes a cradle arm 41 that holds the core of the winding package 6 and a drum 42 that contacts the winding package 6 and rotates the winding package 6. . The cradle arm 41 is rotatably supported on the frame of the twist unit 2 by a support shaft 43 at one end thereof. Even if the diameter of the winding package 6 changes due to the winding of the combined yarn 7, the contact between the winding package 6 and the drum 42 is maintained.

The traverse device 30 is means for traversing the combined yarn 7 sent to the winding device 40 so that the combined yarn 7 is wound around the winding package 6 by traverse winding.
The traverse device 30 includes a traverse arm 31 that guides the combined yarn 7 that is fed from the yarn feeding device 20 to the winding device 40, and the traverse arm that swings (traverses) in the axial direction of the winding package 6. The traverse motor 32 is provided.

  As shown in FIG. 3, one end of the traverse arm 31 is fixed to the motor shaft 32 a of the traverse motor 32, and a hook 31 a that guides the combined yarn 7 is formed at the other end of the traverse arm 31. By driving the traverse motor 32, the hook 31a swings left and right around the motor shaft 32a, and the combined yarn 7 guided by the hook 31a is swung in the axial direction of the winding package 6.

The drive system of each twisting unit 2 provided in the twisting machine 1 will be described with reference to FIG.
Various devices and the like included in each twisted yarn unit 2 are partially driven by a full spindle drive system and the rest are driven by a single spindle drive system.
The full spindle drive means that the device in charge of yarn processing is uniformly driven by a single drive source in all twist yarn units 2. The whole spindle drive system drives the yarn feeding roller 21 of the yarn feeding device 20 and the drum 42 of the winding device 40. The entire yarn feed roller 21 and the drum 42 provided in each twist unit 2 are simultaneously driven by a line shaft (driving shaft shared by all spindles) extending from the all spindle driving unit 3 in the direction in which the twist units 2 are juxtaposed. . The line shaft 8 is a drive shaft that drives the thread feed roller 21 of the entire spindle, and the line shaft 9 is a drive shaft that drives the drum 42 of the entire spindle.
Single spindle driving means that a device in charge of yarn processing in each twisted yarn unit 2 is driven as a single unit independently of the devices of other twisted yarn units 2. The spindle motor 11 of the spindle device 10 and the traverse motor 32 of the traverse device 30 are driven by this single spindle driving method. The spindle motor 11 and the traverse motor 32 are individually provided for each weight, that is, for each twist unit 2. The traverse device 30 and the spindle device 10 provided in each twist unit 2 can be driven independently of the other twist units 2. The spindle device 10 may be driven not by a single spindle but by a full spindle. In this case, for example, power from a single drive source provided in the all spindle drive unit 3 is supplied to each spindle device 10 by a belt.

Precision winding will be described with reference to FIGS. 4 and 5.
In the twisting machine 1, the winding package 6 is wound by precision winding which is a form of traverse winding. In precision winding, the traverse angle is precisely controlled and the reciprocating paths (yarn traveling paths) of the combined yarns are densely aligned, so that a high-density winding package can be formed.
The bobbin shape formed on the winding package 6 (the path around which the combined yarn 7 is wound) includes a winding speed at which the combined yarn 7 is wound around the winding package 6, a package diameter (diameter) of the winding package 6, and It is determined by the traverse speed of the combined yarn 7 (the moving speed of the hook 31a in the axial direction of the winding package 6).
Here, the winding speed of the combined yarn 7 is equal to the peripheral speed of the drum 42 that rotates the winding package 6 and is proportional to the rotational speed of the drum 42. Since this drum 42 is an object to be driven by all spindles, the rotation speed of the drum 42 cannot be changed independently by each spindle, and is kept constant. In addition, the package diameter is determined by the winding speed and the winding time because it increases depending on the amount of the combined yarn 7 wound around the winding package 6.
Considering the above, the traversing speed is the only object that can be adjusted in obtaining the desired bobbin shape.

4 (a) and 4 (b) show development views of the winding package 6 in which a thread winding shape is drawn by precision winding.
This precision winding is a winding method in which the number of winds (referring to the number of yarns wound from one end to the other end in the axial direction of the winding package) is kept constant.
In the bobbin shape shown in FIGS. 4 (a) and 4 (b), the broken line indicates the forward path P of the combined yarn 7 (the route along which the combined yarn 7 travels from the left end to the right end in FIG. 4). A return path L of the yarn 7 (a route along which the combined yarn 7 travels from the right end to the left end in FIG. 4) is shown.
In the bobbin shape shown in either FIG. 4A or FIG. 4B, the number of winds is 4, which is the same. Here, since FIG. 4A and FIG. 4B show development views of the winding package 6, the lower end line and the upper end line of the development view show the same position. Therefore, the number of forward paths P or return paths L crossing the upper end line from the lower end line is equal to the number of winds.

4 (a) and 4 (b), the bobbin shape indicates a stage in which the package diameter is different in the same winding package 6. FIG. The bobbin shape at the stage where the package diameter is increased from the bobbin shape shown in FIG. 4A is the bobbin shape shown in FIG.
As shown in FIGS. 4 (a) and 4 (b), when winding is made by precision winding and the number of winds is constant, the twill angle decreases as the package diameter increases. The traverse angle indicates the inclination angle of the winding direction of the combined yarn 7 with respect to the radial direction of the winding package 6 (vertical direction in FIG. 4). The pincushion-shaped twill angle size θ2 shown in FIG. 4B is smaller than the pincushion-shaped twill angle size θ1 shown in FIG.

As shown in FIG. 5, in order to perform winding by precision winding, it is necessary to gradually decrease the traverse speed as the package diameter increases.
As described above, the winding speed of the synthetic yarn 7 is kept constant. In this case, when the winding amount of the synthetic yarn 7 increases and the package diameter increases, the synthetic yarn 7 to be wound becomes the outer periphery of the winding package 6. It takes longer time to go around. Then, in order to keep the number of winds constant (precise winding), the traverse speed (the combined yarn 7 is equal to that of the winding package 6) as the time required for the combined yarn 7 to go around the outer periphery of the winding package 6 increases. It is necessary to reduce the speed of movement from one end to the other end.
As a result, in order to perform precision winding, as shown in FIG. 5, the traverse speed is decreased in inverse proportion to the increase in the package diameter.

When winding is performed by precision winding, the twill angle is reduced as the package diameter increases, and the position at which the combined yarn 7 is wound around the winding package 6 gradually changes, so that ribbon winding can be prevented. .
Ribbon winding refers to a phenomenon in which the winding position of the yarn on the winding package is the same or substantially the same, and the portion where the yarn is concentrated and swells into a ribbon shape.

Step precision winding will be described with reference to FIGS.
Step precision winding is a winding method in which traverse control is made easier than precision winding by slightly loosening the condition of a constant number of winds.
As shown in FIG. 6A, even in step precision winding, the relationship between the package diameter and the traverse speed is basically an inversely proportional relationship. However, in step precision winding, the traverse speed is not continuously reduced with respect to the increase in the package diameter, but is reduced stepwise in a discontinuous manner. More specifically, the traverse speed is kept constant when the change amount of the package diameter is within the range of the change width d, and the traverse speed is discontinuously decreased every time the change amount of the package diameter exceeds the change width d. Is reduced in a cycle of the change width d.
In step precision winding, the number of winds becomes constant periodically (every time the change width d changes) according to the change in the package diameter. However, since the traverse speed is kept constant while the package diameter changes within the range of the change width d, the number of winds is not constant during this period.
6B shows a straight line in which the maximum value 4 of the wind number in FIG. 6A is continued, and FIG. 6C shows the minimum value 3 of the wind number in FIG. 6A. .8 is a continuous line. In the staircase curve shown in FIG. 6A, the number of winds periodically changes between 3.8 and 4.

FIG. 7 shows a developed view of the winding package 6 in which a bobbin shape is drawn by step precision winding.
Also in FIG. 7, as in FIG. 4, the broken lines indicate the forward paths P <b> 1 and P <b> 2 of the combined yarn 7, and the two-dot chain line indicates the return paths L <b> 1 and L <b> 2 of the combined yarn 7. In particular, the forward path P1 and the return path L1 indicated by thick lines indicate the winding position of the yarn 7 when the wind number takes a maximum value, and the forward path P2 and the return path L2 indicated by a thin line indicate when the wind number takes a minimum value. The winding position of the synthetic yarn 7 is shown.
Moreover, about the expanded view of the winding package 6, the expanded view drawn with the thick line and the expanded view drawn with the dashed-dotted line as a state where the package diameter increased more than that are shown.

When winding is performed by step precision winding, the number of winds changes while the package diameter changes within the range of the change width d. Therefore, the position at which the combined yarn 7 is wound around the winding package 6 is the winding package 6. It changes in the axial direction. In addition to this, there is also an effect when performing winding by precision winding, that is, a change in the twill angle due to an increase in the package diameter.
In other words, in the case of step precision winding, it is possible to form a high-density combined yarn winding package as in the case of precision winding, and avoid ribbon winding as long as there is no problem in the quality of the winding package as a product. Can do. Further, step precision winding is easier in traverse control than precision winding.

A control mechanism for performing precision winding and step precision winding will be described with reference to FIG.
Precision winding and step precision winding are performed by changing the traverse speed as shown in FIGS. 5 and 6 (a) in accordance with the increase in the package diameter under the condition that the winding speed of the combined yarn 7 is constant. Is to be done.
For this reason, in order to perform precision winding or step precision winding, the winding speed detection means for the combined yarn 7, the package diameter detection means, and the traverse speed is controlled based on the detected winding speed and package diameter. Means to do this.

The means for detecting the winding speed of the combined yarn 7 is a drum rotation speed sensor 49 that detects the rotation speed of the drum 42. As described above, the winding speed of the combined yarn 7 wound around the winding package 6 is proportional to the number of rotations of the drum 42 that rotates in contact with the winding package 6. The diameter of the drum 43 is fixed. For this reason, the winding speed is specified if the rotational speed of the drum 42 is known.
The drum rotation speed sensor 49 is provided for every weight (any one of the entire drums 42 disposed on the same line shaft 9) or for each weight (each drum 42).

The package diameter is calculated by the following equation (1).
Package diameter = Drum rotation speed / Package rotation speed × Drum diameter = Winding speed / Package rotation speed (1)
Therefore, the package diameter detection means includes a drum rotation speed sensor 49 that detects the rotation speed (winding speed) of the drum 42, a package rotation speed sensor 48 that detects the rotation speed of the winding package 6, and a winding speed. The unit controller 50 (which will be described in detail later) as means for calculating the package diameter based on the number of rotations of the winding package 6. The drum diameter (the diameter of the drum 42) is a fixed value and can be specified.
The package rotation speed sensor 48 is provided for each weight. In particular, the package rotation speed sensor 48 detects the rotation speed of the core of the winding package 6 supported by the cradle arm 41.

  The means for controlling the traverse speed is the unit controller 50. The unit controller 50 is a computer, and includes an input / output control device 51, an arithmetic device 52, and a storage device 53 for connecting to various devices provided in the twisting unit 2. The arithmetic device 52 executes processing based on the program and data stored in the storage device 53.

Control of the traverse speed for performing precision winding (FIG. 5) and step precision winding (FIG. 6) is performed by the unit controller 50 controlling the driving of the traverse motor 32.
The storage device 53 stores data indicating the relationship between the package diameter and the traverse speed in precision winding (FIG. 5) and step precision winding (FIG. 6), that is, a command value to the traverse motor 32 according to the calculated value of the package diameter. Data is stored. The storage device 53 also stores relational expressions or correspondence table data for calculating the package diameter based on the winding speed and the number of rotations of the winding package 6.
Then, the arithmetic unit 52 calculates the detection information (the rotation number of the drum 42 and the rotation number of the winding package 6) of the drum rotation number sensor 49 and the package rotation number sensor 48 and the package diameter stored in the storage device 53. The package diameter is calculated based on the relational expression (for example, Expression (1)) or the data in the correspondence table.
Next, the arithmetic unit 52 calculates a command value to the traverse motor 32 based on the calculated value of the package diameter and data relating to the precision winding (FIG. 5) and step precision winding (FIG. 6) stored in the storage device 53. And the drive of the traverse motor 32 is controlled by this command value.

By configuring the twisting machine 1 as described above, the traverse becomes a single spindle driving system, and a winding package for precision winding can be formed in all the twisting units. Further, while performing precision winding (FIG. 5) and step precision winding, the drum 42 relating to winding of the winding package 6 can be driven by full spindle driving, which is required for the driving system rather than single spindle driving. Cost can be reduced. In addition, the number of sensors for detecting the number of rotations of the drum 42 can be reduced as compared with the case where the drum 42 is driven by a single spindle, and the cost required for the sensor system can be reduced. Therefore, the cost required for the twisting machine 1 that performs precision winding (FIG. 5) and step precision winding can be reduced.
Further, by forming the winding package 6 for precision winding (FIG. 5) or step precision winding, the winding density can be improved as compared with the ordinary traverse winding, and the winding of the high-density twisted yarn 7 containing the twist. Take package. For this reason, in the case of precision winding or step precision winding, even the same weight can be wound to a smaller diameter than in the case of ordinary traverse winding, and the transportation cost can be reduced. Moreover, since ribbon winding is avoided, the unwinding property of the combined yarn 7 from the winding package 6 is also improved.

Further, the means for detecting the package diameter of the winding package 6 may be configured as follows.
In the above description, the means for detecting the package diameter includes a drum rotation speed sensor 49 for detecting the rotation speed (winding speed) of the drum 42, a package rotation speed sensor 48 for detecting the rotation speed of the winding package 6, and the drum 42. And a unit controller 50 for calculating the package diameter based on the rotation speed of the drum 42 and the rotation speed of the winding package 6.
Instead of this configuration, the means for detecting the package diameter is an angle sensor for detecting the inclination angle of the cradle arm 41 and a control means (using the unit controller 50) for calculating the package diameter based on the inclination angle. . Here, when the package diameter increases, the cradle arm 41 is inclined so as to rise around the support shaft 43, and there is a proportional relationship between the package diameter and the inclination angle. In FIG. 2, the magnitude of the inclination angle is α. Therefore, an angle sensor for detecting the rotation amount of the support shaft 43 of the cradle arm 41 is provided, and the tilt angle of the cradle arm 41 is detected by this angle sensor. Based on this inclination angle, the size of the package diameter is calculated. Even with this configuration, the package diameter can be calculated.

  As a drive source for the traverse device 30, a linear motor, a servo motor, or a stepping motor can be used as the traverse motor 32, or a piezo element can be used as an actuator.

1 is an overall front view of a twisting machine. It is a side view which shows the structure of a winding unit. It is a front view which shows a winding apparatus and a traverse apparatus. FIG. 3 is a development view of a winding package in which a precision winding bobbin shape is drawn. It is a figure which shows the relationship between the package diameter and traverse speed in precision winding. It is a figure which shows the relationship between the package diameter and traverse speed in step precision winding. FIG. 3 is a development view of a winding package in which a step precision winding bobbin shape is drawn.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Twisting machine 6 Winding package 9 Line shaft 31 Traverse arm 32 Traverse motor 41 Cradle arm 42 Drum 48 Package rotation speed sensor 49 Drum rotation speed sensor 50 Unit controller (control device)

Claims (3)

A plurality of twisting units including a spindle device that twists the spun yarn and a winding device that winds the twisted yarn to form a winding package are arranged,
For each twisted yarn unit, a cradle arm that rotatably supports the winding package, a drum for contacting the winding package and rotating the winding package, and the combination wound on the winding package. A traverse motor that traverses the yarn by a traverse arm, and
A twisting machine configured to uniformly drive the drums of each twisting unit with all twisting units by a line shaft,
A drum rotation speed sensor for detecting the rotation speed of the drum;
A package rotation number sensor that is arranged for each twist yarn unit and detects the rotation number of the winding package;
For each twisted yarn unit, based on the diameter of the drum, the number of rotations of the drum, and the number of rotations of the winding package, the winding speed for winding the combined yarn around the winding package and the package diameter of the winding package And a control device for controlling the driving of the traverse motor based on the winding speed and the package diameter so that the combined yarn is wound around the winding package by precision winding,
Comprising
A twisting machine characterized by that. Instead of the precision winding, it is a step precision winding.
The twisting machine according to claim 1. In addition to the package rotation speed sensor, including an angle sensor for detecting the tilt angle of the cradle arm,
The control device calculates the package diameter based on the tilt angle.
The twisting machine according to claim 1 or 2, characterized by the above.

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