JPH0240579B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling thread tension in an automatic winder.

[Conventional technology]

A spinning bobbin produced by a spinning machine, particularly a ring spinning machine, is supplied to a winder and rewound into a package having a predetermined yarn amount and shape. That is,
The yarn on the bobbin that is supplied to a predetermined position in the winding unit of each winder is pulled upward in the axial direction of the bobbin, and the yarn that has left the yarn layer runs while ballooning, and After that, it is wound up while being traversed by a package cage that is rotated by a traverse drum.

[Problem that the invention seeks to solve]

When forming a package in such a winder, if winding is performed with a constant tension throughout, depending on the yarn type, the inner layer of the package may be crushed by the compressive force of the outer layer, resulting in a bulge on the inner layer side of the end face of the package. be.

The present invention aims to solve the above problem.

[Means for solving problems]

The present invention grasps the diameter of a wound yarn layer based on a constant length pulse signal emitted from a constant length pulse generator installed in an automatic winder, and applies a preset designated tension corresponding to the yarn layer diameter to the winding machine. In addition to applying tension to the traveling system through a variable tensioner installed in the unit, when starting winding of one package from zero yarn layer, an initial tension larger than the steady tension in the normal stable range is applied to increase the yarn layer diameter. A tension release range is provided in which the tension is controlled according to the yarn layer diameter until a certain set amount is reached.

〔Example〕

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

FIG. 2 shows a winding unit 1 implementing the invention. The yarn Y released from the yarn supply bobbin 2 passes through a balloon breaker 3, a variable tension device 4, a slab catcher 5, etc., and is wound onto a package 7 rotated by a traverse drum 6.

During winding, the variation in the thickness of the yarn passing through the slab catcher 5 is input as an electric signal 8 to the clearer controller 9, and by comparing it with a reference value, if it exceeds the allowable range, it is determined that the yarn has a defective part. It is determined that it has passed, and the controller 9 is immediately activated.
A command signal 11 is outputted to the cutter drive device 10, and the cutter is operated to forcibly cut the yarn. As the thread is cut, the thread travel signal 12 from the slab catcher 5 is turned off, thread breakage is sensed, and the controller 9 issues a command to stop the traversing drum drive motor 13, causing the drum 6 to stop rotating. Subsequently, a command signal is output from the controller 9 to start the yarn splicing operation by the yarn splicing device, and the yarn splicing is performed by a known yarn splicing means.

Reference numeral 14 in FIG. 2 is a pulse generator that detects the rotation of the traversing drum 5. For example, it consists of a magnet fixed to a part of the end face of the drum and a proximity sensor, and calculates the length of the wound yarn from the number of rotations of the drum. Applies to fixed length mechanisms.

Furthermore, in FIG. 2, the rotational speed of the drum drive motor 13 provided in each winding unit is controlled by an inverter 15 provided in each winding unit. That is, each winding unit U is equipped with a control device 16 for controlling the motor to the most suitable rotational speed based on the winding situation of each unit, and the control signal 17 output from the control device 16 allows Inverter 1
5, the rotational speed of the drum motor 13 is set.

The control of all winding units of the winder is commanded from the central controller 18 to the inverter 15 via a signal line 19. That is, common control for all units includes, for example, setting of the basic yarn speed according to the type of yarn to be rewound, or on/off signals for the ribbon breaker motor.

Furthermore, in the present invention, a tension sensor 20 for detecting the tension of the yarn is installed in a part of the yarn travel path. For example, a sensor using a piezoelectric element can be used as the sensor. That is, the element is formed so that mechanical strain occurs due to pressure applied from the outside, and this strain causes a change in voltage.

In addition, examples of the variable tensor described above are shown in FIGS. 5 and 6.
As shown in the figure. The tensor 20 includes a block 23 of a predetermined shape that supports a pressing plate 21 in a fixed state, and a solenoid device 2 that supports the other pressing plate 22 in a movable state.
4. The solenoid device 24 has an arm 26 which is pivotable about an axis 25 approximately parallel to the thread Y.
and a solenoid 27 that controls the amount of rotation of the arm 26 by a method described later. That is, the solenoid main body 27 moves the pressing plate 22 via the arm 26 to the pressing plate 2 facing the pressing plate 22 in accordance with the command from the control device.
Adjust the amount of pressure to be applied to 1. In another example shown in FIG. 6, the pressing plate 22 is pressed by the spring plate 28.

Note that a variable tension device can also be provided by attaching a pressure plate to the output shaft of a rotary solenoid and electrically controlling the rotation angle of the output shaft of the solenoid.

Next, a tension control method using the above device will be explained.

FIG. 3 shows an embodiment in which the winding tension T is changed in accordance with the increase in the yarn layer y. That is, in this case, at the start of winding, an initial tension T1 larger than the steady tension T2 in the normal stable range is applied, and the yarn layer y is maintained until a certain set amount amm is reached.
A tension release range a is provided to control the tension T according to the tension.

Incidentally, in order to detect the package yarn layer, it is sufficient to detect the amount of displacement of the clade arm with a detector, but the detection device is complicated and is not practical. Therefore, in the present invention, a constant length count having a layer relationship with the package yarn layer is utilized. That is, the package yarn layer is determined by the constant length count number, and tension control is performed based on this.

Next, the relationship between the constant length count number and the package yarn layer will be explained. As shown in Figure 4, the yarn layer is y (mm), the angle of the cone is θ, the diameter of the larger winding amount is D (mm), the traverse width is l (mm), and the volume of the yarn is V (mm ³ ), then V=πl[y ² cosθ+y(D-lsinθ)]...(A).

Also, if the number of constant length counts is N, the yarn length of one constant length count is L (m), the yarn count is Nm (m/gr), and the winding density is S (gr/cm ³ ), then NL=VSNm/ 1000...(b) From formula (a) and formula (b), N=πSNml/1000L[y ² cosθ+y(D-lsinθ)]...
(c) becomes.

On the other hand, in FIG. 3, if the winding tension T is controlled so that it decreases from the initial tension T1 along the parabola f until it reaches the yarn layer a, and becomes a steady tension T2 from the yarn layer a, then o≦y≦ For a, T=(T1-T2)(y-a/a ² )+T2...(d) For a≦y, T=T2...(e).

Therefore, if the relationship between the constant length count number (N) and the winding tension (T) is called a release function, the release function is expressed by the above equation (c) and equations (d) and (e).
By eliminating y from , the relational expression between N and T can be obtained. However, since it is an extremely complicated formula, when actually calculating it with a calculator, o≦y
The release function can be obtained by changing y in small increments in the interval ≦a and memorizing the relationship between N and T at that time.

A system for controlling tension according to the release function obtained from the above calculation will be explained with reference to FIG. 30 is a small computer installed in the main control box installed at the end of the automatic winder machine or in the central control room, and the computer includes:
It has a measuring function, a monitoring function, and a centralized control function for each winding unit, and the function shown in the figure is a tension setting control device. The control device 30 includes a constant length counter 31 that counts constant length pulses sent from the winding unit, a calculator 32 that calculates a release function from winding conditions input in advance, and a count number output from the counter 31. It is composed of an N/T converter 33, etc., which calculates the set tension from.

On the other hand, 40 is a microcomputer installed in each winding unit 1, and is equipped with a tensor control device and the like to apply an actual tension based on the specified tension outputted from the N/T converter 33.

In FIGS. 1 and 2, the thread running signal 12 obtained from the slab catcher 5 on the unit side,
A constant length pulse 42 obtained by ANDing the rotation pulse 41 obtained from the drum rotation sensor 14 is output from the unit 1 side. That is, the constant length pulse 42 is a pulse signal that is emitted only when the yarn is actually running, and this signal is input to the constant length counter Kg31 in the main body control box. The count number N counted by the counter 31 is input to the N/T converter 33, and based on the release function of N and T described above, the thread layer y point at which the tension T corresponding to the count number N exists is determined. It is output to the winding unit 1 as the specified tension T0.

On the other hand, in the winding unit 1, the control device 40, D/
A current suitable for applying a specified tension is applied to the tensor solenoid 27 via the A converter 43, the urging force of the solenoid 27 shown in the fifth figure is controlled, and the thread nipping force between the pressing plates 21 and 22 is set. It will be done. The winding tension T applied to the yarn in this manner is detected by the tension sensor 20. The signal obtained by the tension sensor 20 is transmitted to an amplifier 44 and an A/D converter 45.
It is inputted to the control device 40 via the above, and is controlled in accordance with the above-mentioned release function. That is, the third
As shown in the figure, the winding tension T decreases from the initial tension T1 in the shape of a parabola f, and when the yarn layer y reaches a, the winding is performed at a constant tension T2.

As mentioned above, the initial input items to the microcomputer are the angle of the cone θ, the diameter D of the large side of the winding tube (mm), the traverse width (lmm), the length of the constant length of the yarn (Lm), and the yarn. Count (Nm or
Ne), winding density S (gr/cm ³ ), release range (amm),
Initial tension value (T1), steady tension value T
It is 2. The above values will change depending on the yarn type.

〔Effect of the invention〕

As described above, according to the present invention, a tension suitable for the yarn layer of the package can be applied based on a fixed-length pulse signal, and a package with a uniform winding shape can be obtained. In particular, it is possible to prevent the occurrence of so-called bulges in which the end surfaces of the yarn layer portion protrude outward at the initial stage of winding the package. Furthermore, it is possible to control the tension of each unit from a control room remote from the winder machine without providing a complicated device for constantly detecting the amount of yarn in the package.

[Brief explanation of drawings]

Figure 1 is a block diagram of the method of the present invention, Figure 2 is a schematic diagram showing an example of a winding unit suitable for carrying out the method of the present invention, and Figure 3 is a diagram showing the relationship between yarn layers and tension. , FIG. 4 is a reference numeral diagram showing the size of each part of the package, FIG. 5 is a perspective view showing an example of a variable tension device, and FIG. 6 is a perspective view showing another example of the same. 1... Winding unit, 4... Variable tensioner, 7... Package, T... Winding tension, y... Yarn layer.

Claims (1)

[Claims] 1 The diameter of the wound yarn layer is determined based on the fixed length pulse signal emitted from the fixed length pulse generator installed in the automatic winder, and a preset specified tension corresponding to the yarn layer diameter is sent to the winding unit. In addition to imparting tension to the running yarn through a variable tensioner provided, when winding of one package starts from zero yarn layer, an initial tension larger than the steady tension in the normal stable range is applied, and the yarn layer diameter is set to a certain value. 1. A tension control method for an automatic winder, characterized in that a tension release range is provided for controlling the tension according to the yarn layer diameter until the yarn layer diameter is reached.