JPH05280967A - Method and apparatus for inspecting shape of paper roll - Google Patents

Abstract

PURPOSE:To judge a size of an eccentric amount indirectly by obtaining a maximum displacement amount of a roll end face in a roll axial direction when a paper roll is rotated once by a displacement measuring device and comparing it with a reference displacement amount. CONSTITUTION:An outer diameter D of a paper roll 1 is first obtained by a distance detector 13. After the roll 1 is mounted on rotating rolls 5, 6, the value of the outer diameter D is used to position a displacement (waviness) detector 7 on an end face of the roll 1 in the vicinity of an outer diameter part of the roll 1. A distance detector support 14 is moved toward the roll 1 end face while a distance is being measured by the detector 13, and the detector 7 is made close to an appropriate distance from a mirror face of the roll 1. The rolls 5, 6 are rotated by a motor 8 to have the roll 1 rotated once. When data obtained from the detector 7 is displayed 11, a waving display is shown. A maximum displacement amount W which is difference between the highest and the lowest points of a wave is obtained by arithmetic processing of a calculator 10. By comparing the displacement amount W with an allowable displacement amount, whether a roll 1 shape is good is determined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for inspecting the shape of a paper take-up roll, which can be applied to a post-process of a paper take-up machine in a paper manufacturing factory and can automatically determine the quality of the take-up roll. Is.

[0002]

2. Description of the Related Art A paper take-up roll usually produced by a paper take-up machine has a paper tube (hereinafter referred to as a core) having an outer diameter of about 110 mm and an inner diameter of about 78 mm at its center. The center of the core needs to be correctly positioned at the center of the paper take-up roll, but there are many take-up rolls in which the center of the core and the center of the paper take-up roll do not always coincide with each other due to various reasons. On the other hand, if you use a paper take-up roll (hereinafter referred to as eccentricity) whose core center is not correctly located in the center of the paper take-up roll in a printing machine, etc., the paper take-up roll will rotate while vibrating greatly during the rewinding process of the printing machine. As a result, paper breakage, paper wrinkles, printing defects and the like occur in the printing process.

In order to prevent the above-mentioned troubles due to the eccentricity of the paper take-up roll, the A, B and C, D dimensions of the paper take-up roll shown in FIG. 2 are measured manually by using a tape measure or the like. A-B and C-D must be calculated, and the absolute value of the difference must be compared with an allowable reference value to determine pass / fail. However, it is very troublesome to carry out such a measuring operation for all the paper winding rolls, and therefore such an operation is usually omitted in the actual operation.

[0004]

As described above, the inspection of all rolls for the eccentricity of the core center of the paper take-up roll is not performed in the actual operation as described above. For this reason, a roll having a defective shape in which the amount of eccentricity exceeds the allowable value may be shipped, which causes a trouble in a printing factory. Since the occurrence rate of such troubles is usually 1% or less, it was very difficult to find a defective paper take-up roll in advance by manual measurement work.

However, once a trouble occurs, the printing process becomes confused. Therefore, the printing company, which is a user of the paper take-up roll, urges the paper manufacturing factory to reduce the delivery of defective take-up rolls to zero. Therefore, it has become a big problem to realize a method for fully automatically inspecting the shape of a paper winding roll without manpower for coping with such a problem in a paper mill. Therefore, in the post-process of the paper winder in the paper mill, if all the eccentricity of the produced paper take-up rolls is automatically measured, or if a means that can achieve the same effect as this is realized, the problem will be solved. To do.

As shown in FIG. 3, the chuck 2 is inserted into the core of the paper take-up roll 1, the roll 1 is lifted so as to be rotatable, and the contact or non-contact type displacement measuring device 3 is arranged on the outer peripheral portions of both ends of the roll. This problem can also be solved by obtaining the amount of displacement during one rotation of the roll and then obtaining the amount of eccentricity. However, it is often difficult to measure the amount of eccentricity with the device shown in FIG. 3 because of the operating conditions of the line on which the paper take-up roll is conveyed and restrictions on the arrangement. Therefore, the present inventor has noticed that an eccentric roll has "waviness" (rolling in and out of the roll axial end face) in the circumferential direction of the roll end face (mirror surface), and this " The present invention has been achieved by measuring the amount of "waviness" and determining whether or not the amount of "waviness" is within an allowable value, thereby indirectly determining the magnitude of the amount of eccentricity.

[0007]

Therefore, according to the present invention, a paper take-up roll placed on two rolls whose axes are arranged in parallel with each other, or a central portion supported by a chuck or a through shaft is lifted. The maximum displacement amount is obtained by measuring the displacement amount of the end face of the paper take-up roll in the roll axial direction when the paper take-up roll is rotated once by the displacement measuring device arranged at the outer diameter end face of the paper take-up roll. The maximum displacement amount is compared with the preset quality determination reference displacement amount, and the quality of the shape of the paper take-up roll is determined according to whether the measured maximum displacement amount is larger than the quality determination reference displacement amount. Which is a means to solve the problem. Further, the present invention, a device that rotatably supports the paper take-up roll, a displacement detector arranged in contact or non-contact with the outer diameter portion roll end surface of the paper take-up roll, based on the data from the displacement detector. The maximum deviation amount of the swell of the paper take-up roll is calculated, and the result is used to determine whether the shape of the paper take-up roll is good or bad. This is a means for solving the problem.

[0008]

[Operation] As a result of actual measurement of a paper take-up roll having a large eccentricity, it has been found that the paper take-up roll having a large eccentricity tends to have a larger “waviness” in the circumferential direction of the roll end face in the outer peripheral portion than in the roll central portion. did. Therefore, in order to determine the size of the eccentricity of the core of the paper take-up roll, "waviness" in the circumferential direction of the roll end surface should be determined at a position as close as possible to the roll outer diameter.
It is very important to measure Therefore, in the present invention, the quality of the paper take-up roll can be determined by measuring the "waviness" in the circumferential direction of the roll end face at a position close to the outer diameter of the roll and by rotating the roll once. ..

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments of the drawings. FIG. 1 is an explanatory diagram of a method for inspecting the shape of a paper winding roll showing the embodiment of the present invention. In the method of inspecting the shape of the paper take-up roll 1 according to the embodiment of the present invention, it is important to rotate the paper take-up roll 1 once as described above. An example in which the paper take-up roll 1 is rotated once is shown in FIG. This device has two rotating rolls 5 and 6 whose axes are arranged in parallel. The paper winding roll 1 is placed on the rotating rolls 5 and 6 to rotate the two rolls 5 and 6. It is what makes them. This device has the same principle as that of the paper winding portion of the two-drum type paper winding machine and is well known, so that the detailed description of the rotating device will be omitted.

A method for measuring the amount of eccentricity of the paper winding roll 1 using the two-drum type roll rotating device will be described below with reference to FIG. First, the outer diameter of the paper take-up roll 1 required to measure the amount of "waviness" in the circumferential direction is measured. The outer diameter of the paper winding roll 1 is obtained by the distance detector 11. A commercially available ultrasonic non-contact sensor can be used as the distance detector 11. It is also possible to bring the detection head into direct contact with the roll and determine the outer diameter of the paper take-up roll 1 from the moving distance of the detection head between the contact position and the standby position. Next, after placing the paper take-up roll 1 on the rotating rolls 5 and 6, the displacement (waviness) detector 7 of the roll end face is used by using the data of the outer diameter D of the paper take-up roll 1 obtained in advance by the method described above. The vertical position of. In this case, it is important to position the detector 7 as close to the outer diameter portion of the paper winding roll 1 as possible. When the roll is positioned near the outer diameter D-20 mm, various commercially available detectors can be used.

Next, while measuring the distance by the distance detector 13, the distance detector support 14 is moved from the standby position toward the roll end surface, and the displacement detector 7 is moved to the end surface (mirror surface) of the paper take-up roll 1 to a proper distance. Get closer. After the displacement detector 7 has completed moving to the proper detection position, the rotating rolls 5 and 6 move to the motor 8
Start rotating by. The number of rotations of the rotating rolls 5 and 6 required for rotating the paper take-up roll once is that of the paper take-up roll 1.
The outer diameter D is divided by the outer diameter d of the rotating roll 5 to obtain a value D / d rotation. Therefore, by detecting the number of rotations of the rotating rolls 5 and 6 by the rotary encoder 9 and stopping the motor 8 after reaching D / d rotation, the paper take-up roll 1 can be rotated once.

An example in which the data obtained from the displacement detector 7 is displayed on the displacement display 11 is shown in FIG. In this display example, the vertical axis represents the displacement C in the axial direction of the end surface of the paper take-up roll 1, and the horizontal axis represents the detection length π × one rotation of the paper take-up roll.
D is shown, and an example of the displacement while the displacement detector 7 makes one round at a position relatively close to the outer diameter of the paper winding roll 1 is displayed on the display as shown in FIG. The display is usually wavy, and the maximum displacement amount is the difference W between the highest point Cmax and the lowest point Cmin of the wave. The maximum displacement amount W is obtained by arithmetically processing the data obtained from the displacement detector 7 by the arithmetic unit 10 shown in FIG. The maximum displacement amount W and the allowable displacement amount Wa are compared, and whether W> Wa,
The calculator 10 also determines whether W <Wa.

The arithmetic unit 10 can also output an electric signal that turns on or off when W> Wa or when W <Wa, and can also output W as an analog or digital electric signal. Is. The arithmetic processing in this case can be easily realized by the same principle as a commercially available arithmetic unit. In addition, in the present invention, since the presence or absence of the displacement indicator 11 is not important, the displacement indicator 11 can be removed as necessary. As described above, the quality of the shape of the paper take-up roll 1 is determined by comparing the maximum displacement amount obtained by the detection and the allowable displacement amount. After that, it passed the paper take-up roll that was judged good or bad,
A defective paper take-up roll is eliminated by adding a mark indicating failure or changing the conveyance path of the paper take-up roll. Note that the technique of adding a mark or changing the transport path is a known technique, and thus its description is omitted.

[0014]

As described in detail above, according to the present invention, it is possible to prevent troubles in the printing machine section due to the defective shape of the paper take-up roll at the stage of the paper manufacturing factory. Trouble shooting costs can be saved.
Further, the trouble of the printing machine can be reduced and the reliability of the quality of the paper take-up roll can be improved. In addition, since the device for rotating and supporting the paper take-up roll by two rolls is normally included in the packaging process of the paper take-up roll, if the present invention is applied to this device, a large-scale remodeling of equipment is possible. The present invention can be implemented without any addition.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a state in which a shape inspection of a paper take-up roll according to an embodiment of the present invention is performed.

FIG. 2 is an explanatory diagram for measuring a diameter of a paper winding roll.

FIG. 3 is an explanatory view of a conventionally considered method of inspecting an eccentricity of a paper winding roll.

[Explanation of Codes] 1 paper take-up roll 5,6 rotating roll 7 displacement detector 8 motor 9 rotary encoder 10 calculator 11 displacement indicator 13 distance detector 14 support

Claims (2)

[Claims] 1. An end surface of a paper take-up roll placed on two rolls whose axes are arranged in parallel with each other, or an outer-diameter roll end surface of a paper take-up roll which is lifted with its central portion supported by a chuck or a through shaft. The displacement measuring device placed at the position measures the amount of displacement of the end face of the paper take-up roll in the roll axial direction when the take-up roll is rotated once, and obtains the maximum amount of displacement. A method for inspecting the shape of a paper take-up roll, characterized by determining whether the shape of the paper take-up roll is good or bad by comparing it with a discriminating reference displacement amount and determining whether the measured maximum displacement amount is larger than the good or bad discriminating reference displacement amount. .. 2. A device for rotatably supporting a paper take-up roll, a displacement detector arranged in contact with or not in contact with an end surface of an outer diameter portion of the paper take-up roll, and based on data from the displacement detector. A shape inspecting device for a paper take-up roll, comprising: a calculating means for calculating a maximum displacement amount of the swell of the paper take-up roll and determining whether the shape of the paper take-up roll is good or bad based on the result.