JPS628977A - Control of winder - Google Patents

Abstract

PURPOSE:To achieve high speed winding with no overshoot by program controlling the number of revolutions of a spindle to which a bobbin is mounted according to a preset expression as a function of the winding time and correcting the same according to the output from a tension detector or the like. CONSTITUTION:When a yarn 3 is wound on a bobbin mounted on a spindle 1 which is rotated by a motor 2, the rotating speed of the motor is controlled by a motor variable speed drive 5 which is in turn under the control of a control unit 6. The control unit 6 includes a tension control 8 for PI controlling the deviation epsilon between a tension measured value T detected by a tension detector 4 and a tension set value Tset and a program signal generator 7 for providing a program signal N indicating the number of revolutions of the spindle as the winding time elapses on the basis of the values of yarn travel speed V, polymer discharge rate U, density of winding P, winding width l and paper sleeve diameter D0, and is so designed as to have the program signal N corrected according to the output from the tension control 8.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of controlling a winding machine for winding, for example, a yarn, and more particularly to a method of controlling a spindle-driven winding machine.

(Prior art and its problems) In a spindle-driven yarn winding machine, for example, as the yarn is wound onto the bobbin, the diameter of the yarn package formed on the bobbin gradually increases. In order to keep the winding speed constant, it is necessary to gradually reduce the spindle rotation speed. Conventionally, as a control method for this purpose, for example, Japanese Patent Publication No. 49-1026 and Japanese Patent Application Laid-open No. 51
A combination of a tension control method as disclosed in Japanese Patent Application Laid-open No. 13994 or a combination of a tension control method and a speed control method as disclosed in Japanese Patent Application Laid-Open No. 54-93142 has been used.

Generally, the tension control method involves interposing a tension detector in the running path of the yarn, comparing the tension detected by the tension detector with a set tension, and setting the spindle rotation speed so that the detected tension becomes equal to the set tension. However, as the hoisting speed increases, it becomes difficult to adjust the control gain, resulting in the problem that stable control operations cannot be performed accordingly. In other words, in the tension control method, the process gain changes as the winding diameter increases, so it is necessary to gradually reduce the tension gain, but as the winding speed increases, it becomes extremely difficult to perform optimal variable gain control. It has become so.

Especially at the beginning of winding, it is necessary to rapidly reduce the spindle rotation speed, but if the gain is set high, an overage coat will occur and the tension will drop below the limit, causing the yarn to wrap around the godet and cause yarn breakage, causing problems. Met.

(Object of the Invention) Therefore, the object of the present invention is to solve the problems of the prior art described above and to provide a stable 1iIJIIl even in high-speed winding.
It is an object of the present invention to provide a method for controlling the winding machine of a winding machine.

(Means for Achieving the Object) In order to achieve the above object, according to the present invention, in a winding machine that winds an object by rotationally driving a spindle, the number of rotations of the spindle is determined as a function of the winding time. A detector is provided to program the signal according to a predetermined mathematical formula, and to detect a characteristic that shows a certain fluctuation tendency as the winding of the object progresses. The number of revolutions of the spindle is adjusted through program control.

(Embodiment) FIG. 1 is a control block diagram showing an embodiment of a yarn winding machine to which a winding machine control method according to the present invention is applied. In the figure, a spindle 1 is rotationally driven by a spindle drive motor 2, and a yarn 3 is accordingly wound onto a bobbin (not shown) mounted on the spindle 1. A tension detector 4 is interposed in the traveling path of the yarn 3 to detect the tension of the traveling yarn.

A variable speed motor drive device 5 is provided as a drive source for the spindle drive motor 2, and the rotational speed of the spindle drive motor 2 is freely changed during winding of the yarn 3.
This is to adjust the number of rotations. The motor variable speed drive device 5 receives a rotation speed command signal N1 output from the control device 6.
Then, the spindle drive motor 2 is rotated at a rotational speed based on the contents of the command.

The control device 6 is configured based on a microcomputer, and performs program control of the spindle rotation speed according to a predetermined formula as a function of the winding time, and also performs program control based on the detection signal from the tension detector 4. This is to adjust the spindle rotation speed. That is, the control device 6 includes a program signal generator 7 and a tension control section 8, and the program signal generator 7 adjusts the surface speed of the yarn package on the bobbin (not shown) as a function of the winding time so that the surface speed of the yarn package on the bobbin (not shown) is approximately constant. The expressed mathematical formula is programmed, and based on this, a program signal @N representing the spindle rotation speed at an arbitrary time is outputted, while the tension control section 8 preliminarily calculates the tension measurement value T detected by the tension detector 4. Compared with the predetermined tension setting value 'set, the proportional
The program signal N is supplemented by integral (PI) control i [
That's what I do.

When the spindle rotation speed is programmed so that the surface speed of the yarn package is approximately constant, the speed of decrease is naturally large at the beginning of winding, and decreases as the winding becomes thicker. For example, the relational expression between the spindle rotation speed expressed by the program signal N and the winding time 1 is as follows in the case of cheese winding.

...(1) Here, V is the yarn running speed, ('' is the polymer discharge amount, ρ is the winding density, l is the winding width, t is the winding time, and

represents the diameter of the paper tube. Then, this equation (1) is programmed into the program signal generator 7, and the above V, U, ρ, 1. Each value of Do is initialized before the start of operation, and is set every moment (1) as the winding time t progresses.
) is used to derive the program signal N representing the spindle rotation speed.

Then, the control device 6 executes the calculation expressed by the following equation in real time to correct the program signal N derived as described above, and generates a rotation speed command signal N1 for actually controlling the spindle rotation speed. Create.

N1=N+, ε0(1/T1)Σε...(2) The first term on the right side of the above equation is for the program control expressed by the above equation (1), and the second and third terms on the right side are for tension control. are the proportional and integral control components. Here - the tension control proportional gain,
ε represents the tension deviation, ``set'', T, 1 represents the tension setting value, Φ represents the tension measurement value, and T1 represents the tension control integration time, respectively.

In this case, since the tension control loop is auxiliary, its control gain may be small, and the control system is very stable.

FIG. 2 is an explanatory diagram showing the relationship between the actual spindle rotational speed N1 and the winding time t when the control is performed as described above. In the figure, the solid line represents the spindle rotation speed based on the program signal N from the program signal generator 7, and the dotted lines above and below the solid line represent the correction range by tension control. That is, in actual operation, as the winding time t progresses, the C spindle rotational speed N1 changes while being adjusted within the range indicated by the upper and lower dotted lines around the solid line based on the program control.

In addition, above we explained about the cheese winding yarn winding machine.
The present invention is applicable not only to a cheese winding yarn winding machine but also to, for example, a pirn winding yarn winding machine. Furthermore, the present invention can also be applied to other objects than yarn, such as films and paper, as objects to be wound. Furthermore, instead of the tension detector, a yarn winding speed detector using a touch roller, for example, may be used, and in this case, when comparing the detected speed and the set speed,
] Gram signal N will be adjusted. In short, the detector for adjusting the program signal N need only be capable of detecting a characteristic that shows a certain tendency to change as the winding of an object such as a yarn progresses.

Since the control gain of the control loop for this adjustment is auxiliary, it is set to a small constant value, but in order to further improve the control characteristics, it is set to a variable gain (for example, Kp in equation (2) is set to N −, or ).

(Effects of the Invention) As explained above, according to the present invention, in a winding machine that rotates a spindle to wind an object, the number of revolutions of the spindle is determined according to a predetermined mathematical formula as a function of winding time. In addition to program control, a detector is provided to detect a characteristic that shows a certain fluctuation tendency as the winding of the object progresses, and the program-controlled spindle rotation speed is adjusted based on the detection signal of this detector. Therefore, controlling the spindle rotation speed using a detector such as a tension detector plays an auxiliary role to the program control I control, making it possible to lower the control gain and eliminating the need for variable gain control, which reduces overshoot. The possibility of thread breakage is extremely reduced, and a stable control system can be constructed. In particular, the present invention can be preferably applied when the winding speed is 3000 TrL/sin or higher, since it exhibits even greater effects.

[Brief explanation of drawings]

Fig. 1 is a control block diagram showing an embodiment of a yarn winding machine to which the winding machine control method according to the present invention is applied, and Fig. 2 shows the spindle rotation speed and winding when the control method according to the present invention is applied. It is an explanatory diagram showing a relationship with time. 1... Spindle 2... Spindle drive motor 3... Yarn 4... Tension detector 5... Motor variable speed drive device 6... Control device 7... Program signal generator 8 ...Tension control section

Claims (4)

[Claims] (1) In a winding machine that winds an object by rotationally driving a spindle, the number of revolutions of the spindle is controlled by a program according to a predetermined formula as a function of winding time, and as the winding of the object progresses, a constant 1. A method for controlling a winding machine, comprising: providing a detector for detecting a characteristic showing a fluctuation tendency; and adjusting the program-controlled spindle rotation speed based on a detection signal from the detector. (2) The method for controlling a winding machine according to claim 1, wherein the detector is a tension detector. (3) The method for controlling a winding machine according to claim 1, wherein the detector is a winding speed detector. (4) The method for controlling a winding machine according to claim 1, wherein the object is a yarn.