JP2881403B2 - Web winding method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for winding a web such as a plastic film, and more particularly, to feeding the web from an unwinding roll on which the web is wound, and feeding the fed web along a web transport path. Transport
When a web is wound on a winding roll while applying a winding contact pressure by a contact pressure roller, a good winding appearance is achieved by controlling a conveying speed, an unwinding torque, a winding torque or a winding contact pressure. The present invention relates to a method and an apparatus for manufacturing a wound product.

[0002]

2. Description of the Related Art When manufacturing a web such as a plastic film, a slitter device is used as a web winding device.
The web is continuously fed out, and the fed web is conveyed along a web conveying path.In the middle of the web, the web is cut and separated into a plurality of narrow webs by a cutter. There is a step of winding the film on a winding roll while applying a winding contact pressure by a pressure roller.

In this process, in order to manufacture a web winding product having a good winding shape, an operator constantly observes a web transport state and a web winding shape, and outputs an unwinding torque, a winding torque, and a transporting torque. It is necessary to manually adjust the speed and the winding contact pressure. However, such observation / adjustment work requires skill and has a problem that it takes time to train operators.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a web winding device that observes the state of web transport performed by a conventional skilled operator, as well as unwinding torque, winding torque, transport speed, and the like. An object of the present invention is to automate the operation of adjusting the winding contact pressure and eliminate the need for a skilled operator.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method for feeding a web from an unwinding roll on which the web is wound, and transporting the fed web along a web transport path. Is a method of winding on a take-up roll while applying a take-up contact pressure by a contact pressure roller.Image processing is performed on a pattern appearing on the surface of the web during conveyance of the web, and the image data is stored in a memory in advance. Determining the transport state of the web by comparing it with reference image data relating to a basic pattern appearing on the web surface, and controlling at least one of a transport speed, an unwinding torque, a winding torque, and a winding contact pressure. And a method characterized by the following.

[0006] In order to solve the above-mentioned problems, the present invention also provides a method for feeding a web from an unwinding roll on which the web is wound, and transporting the fed web along a web transport path.
An apparatus for rewinding the web on a take-up roll while applying a take-up contact pressure by a contact pressure roller, comprising: a position on the web transport path, a position on the unwind roll, and a position on the take-up roll. Image input means for taking in a pattern appearing on the web surface during transport of the web at at least one of the positions and outputting image data of the pattern, and reference image data relating to a basic pattern appearing on the web surface are stored in advance. Image memory means to compare the image data with the reference image data, determine the transport state of the web according to the comparison result,
The apparatus comprises an arithmetic and processing means for outputting a control signal for controlling at least one of the conveying speed, the unwinding torque, the winding torque and the winding contact pressure.

[0007]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram schematically showing a configuration of an embodiment of a web winding device according to the present invention.

The web take-up device shown in FIG. 1 is formed as a slitter device. The web winding device according to the present invention includes an unwinding roll 1 and first and second winding rolls 2a and 2b arranged at an interval from the unwinding roll 1.
And a web transport path 3 disposed between the unwind roll 1 and the take-up rolls 2a and 2b, and a cutter 4 disposed in the middle of the web transport path 3.

A wide web 5 is wound on the unwinding roll 1 in advance, and the web 5 is unwound from the unwinding roll 1, and the unwound web 5 is conveyed along the web conveying path 3. . The web 5 is cut and separated into two narrow webs 6 by a cutter 4,
Independently of the first and second winding rolls 2
a and 2b. At this time,
The first and second winding rolls 2a and 2b are in contact with contact pressure rollers 7a and 7b attached to a rotation shaft arranged in parallel with the rotation shaft thereof, and the contact pressure rollers 7a and 7b The contact pressure on the take-up rolls 2a and 2b, that is, the take-up contact pressure is adjusted so that air can be prevented from entering between the taken-up webs. I have.

For the sake of simplicity, the illustrated web take-up device is configured to cut a wide web into two narrow webs, separate the webs, and wind the web again. May be cut and separated into three or more narrow webs. Of course, in this case, three or more winding rolls are arranged according to the number of webs to be wound.

As shown in FIG. 1, a tension detector 21 for detecting the unwinding tension is disposed at a position between the unwinding roll 1 and the cutter 4 in the web transport path 3. The detection result by the detector 21 is fed back to the unwinding roll control unit 17 through the unwinding tension detecting unit 22, whereby the unwinding torque is controlled.

[0012] The web winding device according to the present invention further comprises:
At least one of a position on the web transport path 3, a position on the unwinding roller 1, and a position on the winding rollers 2a and 2b, the pattern is arranged to face the web and appears on the web surface during web transport. CCD camera 8 for capturing the In this case, instead of a CCD camera,
A line sensor or an image pickup tube type TV camera may be used.

The CCD camera 8 is disposed on the web transport path 3 and above a transport roller 9 located immediately before winding of the web. The CCD camera 8 detects each web 6 separated and cut by the cutter 4 at the same time. If the area to which an image is to be input is large, such as the width of a web, a plurality of CCD cameras can be arranged.

Although not shown, a suitable projector is disposed adjacent to the CCD camera 8 and a CCD on the web surface is provided.
The detection area of the camera 8 is illuminated, and the CCD camera 8 detects light reflected by the projector. in this case,
If the web is transparent, the light projector may be arranged on the opposite side of the CCD camera across the web, and the CCD camera may detect light transmitted by the light projector. At this time, it is needless to say that the CCD camera is disposed on the web transport path at a position on the opposite side of the web with no rollers or the like.

Further, the web take-up device according to the present invention comprises:
A clock pulse generator 10 for generating a timing pulse, and an A / D converter 12 for sampling an image of a pattern captured by the CCD camera 8 and outputting the image data according to the timing pulse. The CCD camera 8, clock pulse generator 10, and A / D converter 12 constitute an image input unit.

The construction of the image input means is not limited to that of this embodiment, but may be at least one of a position on the web transport path, a position on the unwinding roll, and a position on the winding roll. Any configuration may be used as long as a pattern appearing on the web surface during web transport is captured and image data of the pattern is output.

The web winding device according to the present invention also has an image memory 13 for storing image data output from the image input means. In the image memory 13, in addition to the image data, reference image data relating to a basic pattern appearing on the surface of each web 6 to be conveyed, in particular, a basic pattern appearing on the surface of each web 6 when the conveyance is not normal is previously stored. It is remembered.

FIG. 2 shows a basic pattern which appears on the surface of each web 6 when the conveyance is not normal. In FIG. 2, (A) shows a reverse wedge-shaped wrinkle pattern that appears on both side edges of the web 6 when viewed toward the upstream side in the transport direction.
(B) shows the pattern of wedge-shaped wrinkles that appeared on both side edges of the web 6 when viewed toward the upstream side in the transport direction.
Shows a diagonal wrinkle pattern appearing at the center of the web 6 when viewed toward the upstream side in the transport direction, and (D) shows a vertical pattern appearing at the center of the web 6 when viewed toward the upstream side in the transport direction. (E) shows a horizontal wrinkle pattern that appears in the width direction of the web 6 when viewed from the upstream side in the transport direction. In this embodiment, reference image data for each of the basic patterns shown in FIG. 2 is stored in the image memory 13 in advance.

The web winding device according to the present invention further comprises:
It has an operation / processing unit 14. The calculation / processing unit 14
The image data is compared with the reference image data, the state of conveyance of the web is determined according to the comparison result, and a control signal for controlling at least one of the conveying speed, the unwinding torque, the winding torque, and the winding contact pressure is output. It is supposed to.

That is, the operation / processing unit 14 compares the image data with the reference image data, and if the image data matches the reference image data relating to the inverted C-shaped wrinkle pattern (FIG. 2A) on both side edges. Then, the arithmetic and processing unit 14 outputs a control signal for reducing the winding contact pressure to the first contact pressure roller control unit 18a or the second contact pressure roller control unit 18b, and restores the normal conveyance state. Let it.

If the image data coincides with the reference image data relating to the wedge-shaped wrinkle pattern (FIG. 2B) on both side edges, the arithmetic and processing unit 14 outputs the unwinding torque and the winding torque. Is output to the unwinding roll control unit 17, the first winding roll control unit 19a, or the second winding roll control unit 19b to restore the normal transport state. If the image data matches the reference image data relating to the oblique wrinkle pattern at the center (FIG. 2C), the arithmetic and processing unit 14 sends a control signal for lowering the winding contact pressure to the first contact pressure. Output to the roller control unit 18a or the second contact pressure roller control unit 18b to restore the normal transport state.

If the image data matches the reference image data relating to the pattern of the vertical wrinkle at the center (FIG. 2D), the arithmetic and processing unit 14 outputs a control signal for increasing the winding contact pressure. Output to the first contact pressure roller control unit 18a or the second contact pressure roller control unit 18b to restore a normal transport state. If the image data matches the reference image data relating to the horizontal wrinkle pattern (FIG. 2E) in the width direction, the arithmetic and processing unit 14 outputs a control signal for increasing the unwinding torque and the winding torque. Output to the unwinding roll control unit 17, the first winding roll control unit 19a, or the second winding roll control unit 19b to restore the normal transport state. Further, if the image data is the reference image data of the inverted wedge-shaped wrinkle pattern (FIG. 2 (A)) on both sides and the reference image data of the vertical wrinkle pattern (FIG. 2 (D)) at the center. If they match with each other, the calculation / processing unit 14 sends a control signal for lowering the transport speed to the unwinding roll control unit 17, the cutter control unit 20, the first winding roll control unit 19a, or the second Winding roll control unit 19b
To restore the normal transport state.

In this embodiment, the transport speed, the unwinding torque and the winding torque, and the increase and decrease of the winding contact pressure are all varied up and down by about 5% from their initial set values. Further, this raising and lowering is performed instantaneously when an abnormal transport state is detected, and after raising and lowering, is returned to the initial set value again.

For the meandering of the conveyed web, CC
The D camera 8 is arranged in the middle of the web transport path 3, and the image captured from the CCD camera is processed in the same manner as before to detect whether or not the web has protruded to both sides of the predetermined transport path. Can be easily detected. In this case, instead of the CCD camera 8, line sensors can be arranged near both sides of a predetermined conveyance path.

As shown in FIG. 1, the image data stored in the image memory 11 is converted from digital to analog by the D / A converter 15, and the output from the D / A converter 15 is connected to the CRT display 16. By doing, C
An image captured by the CD camera 8 can be displayed on the CRT display 16 in real time to monitor the web transport state.

Further, if the image data and the like stored in the image memory 11 are stored on a floppy disk, the history of defects at the time of winding the wound product can be referred to in the next work process. , Work efficiency is improved.

As described above, according to the web take-up device of the present invention, the pattern appearing on the surface of the web during the web transport can be image-processed, and the web transport state can be automatically monitored to the same degree as visual observation. . Then, by automatically controlling at least one of the conveying speed, the unwinding torque, the winding torque, and the winding contact pressure according to the monitoring result, a wound product having a good winding shape is manufactured. can do.

[0028]

As described above, according to the present invention, by performing image processing on a pattern appearing on the web surface during web transport, monitoring of the web transport state performed by a conventional skilled operator, transport speed,
The adjustment of the unwinding torque, the winding torque, and the winding contact pressure can be automated, and a skilled operator is not required. Therefore, it is possible to reduce the labor for the web winding operation and thus reduce the cost.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically illustrating an embodiment of the present invention.

FIG. 2 is a plan view showing a basic pattern appearing on the surface of the web when the web is not properly transported.

[Explanation of symbols]

 Reference Signs List 1 unwinding roll 2a, 2b winding roll 3 web transport path 4 cutter 5, 6 web 7a, 7b pressure roller 8 CCD camera 9 transport roller 10 clock pulse generator 12 A / D converter 13 image memory 14 arithmetic / processing unit 15 D / A converter 16 CRT display

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B65H 23/18-23/198 B65H 26/00-26/08 B65H 18/00-18/28

Claims (2)

(57) [Claims] 1. A web is fed from an unwinding roll on which a web is wound, and the fed web is conveyed along a web conveyance path. Image processing of a pattern appearing on the web surface during transport of the web, and comparing the image data with reference image data about a basic pattern appearing on the web surface stored in a memory in advance. Determining a transport state of the web and controlling at least one of a transport speed, an unwinding torque, a winding torque, and a winding contact pressure. 2. A web is fed from an unwind roll on which a web is wound, and the fed web is conveyed along a web conveying path. At least one of a position on the web transport path, a position on the unwinding roll, and a position on the winding roll.
Image input means for taking in a pattern appearing on the web surface during transport of the web and outputting image data of the pattern; image memory means for previously storing reference image data relating to a basic pattern appearing on the web surface; Comparing the image data with the reference image data, determining a conveyance state of the web according to the comparison result, and transmitting a control signal for controlling at least one of a conveyance speed, an unwinding torque, a winding torque, and a winding contact pressure. Calculation to output
An apparatus comprising processing means.