JPH0940249A - Torque control method for winder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform torque control of high accuracy over a wide range of winding shaft or winding shaft torque control at the time of winding various products. SOLUTION: A torque adjustable driving device 1 and a braking device 2 for generating variable minus torque are connected to a winding shaft 3 of a winder. It is so constituted that the maximum generated torque of the braking device 2 is larger than the minimum generated torque of the driving device 1 and that the torque control unit of the braking device 2 is smaller than that of the driving device 1, and the winding shaft 3 is driven by the torque difference between driving torque from the driving device 1 and minus torque from the braking device 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method capable of performing highly accurate torque control over a wide winding shaft or unwinding shaft torque control range when winding various products. The present invention relates to a method for controlling the torque of a winding shaft or an unwinding shaft, which can improve the control accuracy at the time.

[0002]

2. Description of the Related Art A product such as a plastic film, a metal foil, a paper, a tape, or a fiber which is continuously wound on a winding core is detected based on a winding diameter and a required tension or by a tension detecting mechanism. The tension control for calculating and controlling the winding shaft torque on the basis of the tension to wind the product at the optimum tension is widely known.

[0003]

The proper torque of the winding shaft depends on the thickness, width, and product of the product (for example, plastic film).
The control width (difference between the maximum generated torque and the minimum generated torque) is preferably as large as possible in order to have general versatility, because it greatly changes depending on the winding length and the like. However, since the torque control of the winding shaft is performed by controlling the output of a single drive device, for example, a torque motor, the control width is naturally limited, and the torque control should be performed over a wide range. Was difficult.

Particularly, the control accuracy at the minimum diameter / minimum tension is likely to become a problem, and a minute change in the control accuracy unit remarkably appears in the change in the winding tension, and the quality of the product is impaired. Further, if the small torque region is emphasized, the maximum torque is limited, which greatly affects the braking ability during deceleration, and there is a drawback that productivity is reduced due to an increase in deceleration time, product breakage due to inertia during a sudden stop, etc. . Also, when unwinding (rewinding) a film that has been wound up,
A brake (minus torque) is applied to the unwinding shaft, but there is a similar problem in torque control by the brake device.

[0005]

SUMMARY OF THE INVENTION The present invention provides a method for high-accuracy torque control over a wide torque control range with respect to the above-mentioned problems. A method of controlling torque by connecting a variable torque drive device and a brake device that generates a variable negative torque to a winding shaft, wherein the maximum generated torque of the brake device is larger than the minimum generated torque of the drive device. ,
Further, the torque control unit of the brake device is configured to be smaller than the torque control unit of the drive device, and the winding shaft is driven by the torque difference between the drive torque from the drive device and the negative torque from the brake device. It is a method of controlling a winding shaft torque of a winding machine.

Another aspect of the present invention is a method for controlling torque by connecting first and second brake devices for generating a variable negative torque to an unwinding shaft of a winder.
The maximum generated torque of the second brake device is larger than the minimum generated torque of the first brake device, and the torque control unit of the second brake device is smaller than the torque control unit of the first brake device. A method for controlling the unwinding shaft torque of a winding machine is characterized in that a total torque of the negative torques from the first and second braking devices is applied to the unwinding shaft.

[0007]

Preferred embodiments of the present invention will be described below in detail with reference to the drawings. First, the winding shaft torque control mechanism in the method of the present invention will be described with reference to FIG. In the figure, reference numeral 1 is a drive device that generates torque on the winding shaft, and a motor that can control torque, a motor that cannot control torque, or a device that enables torque control as a whole is used. . The torque transmitted to the winding shaft of No. 3 winds up the product 4 with the tension according to the winding diameter. This point is the same as the conventional mechanism.

In the present invention, by adding the brake device 2 in the figure, the torque transmitted from 1 is shared by the brake device 2 and the winding shaft 3, and the torque from the drive device 1 and the brake device 2 are used. The torque transmitted to the winding shaft 3 (that is, the tension of the product 4) is controlled by the difference in torque (minus torque). The torque distribution between the drive device 1 and the brake device 2 is controlled by the arithmetic and control unit 5. Here, the brake device 2 is configured such that the maximum generated torque is larger than the minimum generated torque of the drive device, and the torque control unit is smaller than the torque control unit of the drive device.

Hereinafter, examples will be described by using numerical values.
When the driving device 1 having a rating of 100 N · m and the braking device 2 having a rating of 10 N · m are combined and the respective control accuracies are 1: 100, the torque control unit of the driving device 1 alone is 1 N · m. , 1 to 100 N · m is the control range. Similarly, for the brake device 2 alone, the torque control unit is 0.1 N · m and the control range is 0.1 to 10.0.
N · m.

When the drive unit 1 is used alone, for example, in order to control the tension with an accuracy of 10%, the torque control unit is 1
Since it is N · m, the set torque range becomes 1:10. That is, when driving at 10 N · m, the control unit is 1 N · m, so 10 ± 1 N · m, that is, 10%.
Accuracy is obtained, but when driving at 5Nm, 5 ±
Only 1 or 20% accuracy can be obtained. The above condition is satisfied in the range of 10 to 100 N · m.

On the other hand, since the winding shaft torque (N · m) = tension (N) × winding diameter (m) is satisfied, the winding diameter ratio (ratio of winding start diameter to winding end diameter) is 1: When the ratio is 5, the ratio between the minimum tension and the maximum tension obtained is at most 1: 2, and the tension cannot be set and controlled in a wide range.

Therefore, by using the drive unit 1 and the brake unit 2 of the present invention together, a part of the torque of the drive unit 1 is shared by the brake unit 2 so that a minimum of 0.1 is achieved.
A control accuracy of N · m and a wide control range of 0.1 to 100 N · m can be easily obtained.

This relationship is shown in FIG.
The torque is variable in 1 N · m units like A, and finer control than that is not possible. Therefore, if a braking device 2 that can be controlled in units of 0.1 N · m is added as shown in B of FIG. 2, the combined torque of the two becomes C.
Control unit of minimum 0.1 N ・ m and 0.1-100 N ・ m
A wide control range can be easily obtained. With this winding machine, the torque ratio at the maximum diameter / maximum tension and the torque at the minimum diameter / minimum tension can be up to 1: 1000.
In the case of controlling the tension with 0% accuracy, if the winding diameter ratio is 1: 5 and the tension ratio is 10 times 1:20, which is about the same ratio, the tension can be controlled with 1% accuracy.

Generally, the torque control unit of the drive unit 1 is 1
When the brake device 2 having the torque control unit of / N (N is a positive number larger than 1) is used, the overall control accuracy can be improved up to N times. In this case, the maximum generated torque of the brake device 2 is made larger than the minimum generated torque of the drive device 1, that is, the torque variable ranges of the two are overlapped with each other, so that the torque with a high control accuracy is continuously obtained in a wide torque range. Control can be performed.

As an example of specific control, the drive unit 1 and the brake necessary for obtaining an appropriate tension in the arithmetic and control unit 5 based on signals from the winding diameter detection unit 6 and the tension detection unit 7. The torque of the device 2 is calculated and a control signal is sent to both devices. The tension can be controlled by a conventional method such as constant tension control or control by a certain tension pattern.

The drive device in the present invention includes, for example, a torque controllable motor (DC motor, servo motor, torque motor, air motor, hydraulic motor, etc.) and a clutch (powder clutch / hysteresis clutch).
The above-mentioned devices can be applied as a brake function as a fluid coupling) and a brake device, and there are various combinations thereof.

Although the above description has been concerned with the control of the winding shaft torque of the winding machine, the same control can be applied to the unwinding shaft of the winding machine. Regarding the unwinding shaft, it is necessary to control the brake (minus torque).

Therefore, the unwinding shaft of the winder is connected to the first and second braking devices for generating the variable negative torque so that the maximum braking torque of the second braking device is the minimum of that of the first braking device. If the torque control unit of the second brake device is larger than the generated torque and the torque control unit of the second brake device is smaller than the torque control unit of the first brake device, the combined torque of the negative torques from the first and second brake devices becomes , It becomes possible to control by the torque control unit of the second brake device.

As the winding machine to which the present invention is applied, there are an in-line winding machine in a production line for products such as plastic film, a rewinding machine for rewinding a product once slitted, and the like. It can also be applied to various processing machines such as a bag making machine, a coater (coating machine), and a printing machine.

[0020]

As described above, the torque control method for the winding shaft according to the present invention makes it easy to control accuracy by adding a general-purpose brake to the conventional torque control mechanism without using an expensive torque control device. It is possible to realize improvement and expansion of the control range, and also to improve the braking ability during deceleration. As a result, one machine can wind up a wide range of conditions, so that it is possible to handle various products. Further, according to the unwinding shaft torque control method of the present invention, similarly, it is possible to easily realize improvement in control accuracy and expansion of the control range.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a winding shaft torque sharing mechanism according to the present invention.

FIG. 2 is a diagram illustrating combined torque of a drive device and a brake device.

[Explanation of symbols]

 1 Drive device 2 Brake device 3 Winding shaft 4 Product 5 Arithmetic control device

Claims (2)

[Claims] 1. A method of controlling torque by connecting a drive device of variable torque and a brake device for generating a variable negative torque to a winding shaft of a winder, wherein the maximum generated torque of the brake device is the above-mentioned. The torque control unit of the brake device is larger than the minimum generated torque of the drive device, and the torque control unit of the brake device is smaller than the torque control unit of the drive device, and the winding is performed by the torque difference between the drive torque from the drive device and the negative torque from the brake device. A method for controlling a winding shaft torque of a winding machine, characterized by driving a winding shaft. 2. A method for controlling torque by connecting first and second brake devices that generate a variable negative torque to an unwinding shaft of a winder, wherein the maximum generated torque of the second brake device is The torque control unit of the second brake device is smaller than the minimum generated torque of the first brake device, and the torque control unit of the second brake device is smaller than the torque control unit of the first brake device. A method for controlling the unwinding shaft torque of a winder, wherein a total torque of negative torque is applied to the unwinding shaft.