JP2002284415A - Control method of web meandering correction device - Google Patents

Abstract

(57) Abstract: A control method of a web meandering correction device for correcting the meandering of a web unwound from a web unwinding device is provided. A web side edge position detection sensor, a web unwinding device or web meandering correction roller, a driving device for moving the web unwinding device or web meandering correction roller, and a detection result of the web side edge position detection sensor And a control unit for transmitting a signal to the driving device in response to the movement of the web unwinding device or the web meandering correction roller for correcting the amount of displacement of the web in the width direction. Smaller than the deviation amount,
A cycle in which a signal is transmitted from the control unit to the driving device is set to be equal to or longer than a web moving time between a web unwinding device or a web meandering correction roller and a web side edge position detection sensor. How to control the device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a meandering correction device for a continuously running web.

[0002]

2. Description of the Related Art In general, when a web such as a plastic film or paper is manufactured or subjected to processing such as printing or coating on a surface thereof, a horizontal displacement, a so-called meandering phenomenon, which is displaced from a predetermined conveying path in a feeding process at high speed. easy. When the lateral displacement occurs, the web comes into contact with a transport guide or the like and is damaged, or a problem such as a printing displacement or a cutting error due to the lateral displacement occurs in a subsequent web processing step. In order to prevent such an accident from occurring, it is necessary to immediately detect the occurrence of a lateral shift in the web and to take measures corresponding to the lateral shift. For this purpose, a web side edge position control device (hereinafter referred to as an EPC device) is usually used. The EPC device generally includes a web side edge position detection sensor (hereinafter, referred to as an EPC sensor), a web unwinding device or a web meandering correction roller, and a driving device for moving the web unwinding device (hereinafter, an EPC driving device). And a control unit (hereinafter referred to as E) that transmits a signal to the driving device in response to the detection result of the web side edge position detection sensor.
PC control unit).

[0003] In the above manufacturing process, it is often necessary to increase the winding diameter of the unwinding raw material due to the speeding up of the web as the raw material, the productivity of the product, and the like. Also, in order to continuously feed out the web without stopping the line, a device for connecting the old web and the new web is required,
It becomes difficult to install the EPC sensor immediately after the web unwinding device. However, if the distance between the EPC sensor and the unwinding device is 1 m or more, it takes time for the meandering correction result to be reflected on the EPC sensor, resulting in an excessive correction. In some cases, it became impossible. In addition, when the web is corrected by the web meandering correction roller instead of the web unwinding device, even if the EPC sensor is installed closer than 1 m, if the adhesive force between the web meandering correction roller and the web is small, the web correction roller may be damaged. It took time for the correction result to be reflected on the EPC sensor, and there was a similar problem. Further, if the correction speed of the web unwinding device is sufficiently reduced in order to prevent the above problems, there is a problem that it takes time to correct the web meandering.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to correct a meandering due to a distance between a web unwinding device and an EPC sensor or a small adhesion between a web meandering correction roller and a web. It is an object of the present invention to provide a control method for controlling the web side edge position without any problem even when it takes time for the result to be reflected on the EPC sensor.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a web side edge position detecting sensor, a web unwinding device or a web meandering correction roller, and a driving device for moving the web unwinding device or the web meandering correction roller. And a control unit for transmitting a signal to the driving device in response to a detection result of the web side edge position detection sensor, wherein the web meandering correction device corrects a shift amount in a width direction of the web. The amount of movement of the unwinding device or the web meandering correction roller is made smaller than the deviation amount, and the period at which a signal is transmitted from the control unit to the drive device is determined by the web unwinding device or the web meandering correction roller and the web side edge position. This is achieved by a control method of a web meandering correction device, wherein the web moving time between detection sensors is equal to or longer than a moving time.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a web transport device according to the present invention will be described below with reference to the drawings, using a pattern of an EPC device for moving a web unwinding device. FIG. 1 is a schematic plan view near the web unwinding device. The roll-shaped unwinding web 1 hanged on the web unwinding device 4 is unwound toward the transport roller 2 and is transported. Unwinding and transporting web 8
Is a paper web. The EPC device includes an EPC sensor 3, a web unwinding device 4, a driving device 5 for moving the web unwinding device 4 in the width direction, and an EPC control unit 6. The EPC sensor 3 is arranged downstream of the unwinding device 4 in the transport direction. The unwinding device 4 is an EPC
The position of the unwinding web 1 is controlled by moving the web in the width direction (the direction of the arrow Y) by the driving device 5 so that the position of the web at the sensor 3 becomes constant.

The control mode of the present invention will be described. EP
The shift amount detected by the C sensor 3 is sent to the EPC control unit 6. Here, an amount smaller than the deviation amount, preferably 30% to 90% of the deviation amount, is sent to the driving device 5 as a movement amount. Further, the period of transmitting the movement amount signal to the driving device 5 is the time (t) until the web 8 unwound from the web unwinding device 4 and conveyed reaches the EPC sensor 3, that is, from the unwinding web 1 to the EPC sensor. The distance to sensor 3,
It is equal to or longer than the arrival time (t) of the web 8 calculated based on the line speed information sent from the line control unit 7, and is preferably two to three times the above (t).

In the above control, if the side edge of the web is outside the range in which the amount of deviation cannot be measured by the EPC sensor 3, that is, outside the detection range, the detection of the EPC sensor 3 is performed regardless of the amount of deviation. The maximum range in which detection can be performed is 以下 or less of the detection range, preferably 40% to 5%
The correction amount is sent to the driving device 5 with 0% as the correction amount. The period of transmitting the correction signal to the driving device 5 is equal to or longer than the above (t), but is preferably three to four times the (t).

The EPC sensor 3 may be a method of detecting the presence or absence of interruption of light, ultrasonic waves, airflow, or the like by a web, or a method of detecting the position of a side edge of the web from an image captured by a camera.

[0010] In the control method of the web meandering correction device according to the present invention, the distance between the web unwinding device and the EPC sensor is one.
m or more, and is particularly effective when it is 2 m or more.

[0011]

Hereinafter, the present invention will be described more specifically. The web is transported at a web width of 1500 mm and a web transport speed of 100 m / min. The distance between the EPC sensor 3 and the unwinding device 4 is 5 m, and the detection range of the EPC sensor 3 is 20 mm.
First, when the web side edge is outside the detection range of the EPC sensor 3, the moving amount sent to the driving device 5 is 4 mm of 20 mm.
9%, which is 5%, and the above (t) is 3 seconds, and the period of transmitting the movement signal to the driving device 5 is 3.5 times 10.5.
Controlled in seconds. Thereafter, when the web side edge is within the detection range of the EPC sensor 3 and the shift amount is 10 mm, the moving amount is controlled to 6 mm, which is 60% of the shift amount, and the cycle is controlled to 2.5 times 7.5 seconds to meander. Is corrected.

[0012]

According to the control method of the web meandering correction apparatus of the present invention, the meandering of the web can be reduced, and the production efficiency can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an embodiment to which the present invention can be applied.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 unwinding web 2 transport roller 3 EPC sensor 4 EPC unwinding device 5 EPC driving device 6 EPC control unit 7 line control unit 8 web unwinding and transporting

Claims (1)

[Claims] 1. A web side edge position detection sensor, a web unwinding device or web meandering correction roller, a driving device for moving the web unwinding device or web meandering correction roller, and detection of the web side edge position detection sensor. And a control unit for transmitting a signal to the driving device in response to the result, wherein the moving amount of the web unwinding device or the web meandering correction roller for correcting the displacement amount in the width direction of the web is determined. , The period of transmitting the signal from the control unit to the drive unit is set to be equal to or longer than the moving time of the web between the web unwinding device or the web meandering correction roller and the web side edge position detection sensor. A method of controlling a web meandering correction device, characterized in that: