JPH07304567A - Package inspecting device - Google Patents

Abstract

PURPOSE:To detect fluff generated on a package end surface without being interrupted by a bulge or the like on the end surface. CONSTITUTION:A light projecting means 4 arranged in the direction opposed to a package end surface 2 illuminates a limited belt-like area on the package end surface 2 running along a radiation line reaching the outside edge from the center of the package end surface 2. A fluff guiding device 8 raises up fluff in an illuminating area from the package end surface by electrostatic induction. A CCD camera 10 picks up an image of the illuminating area and an unilluminated area from angle at which an image of an unilluminated area on the package end surface 2 is picked up as a background of the raised-up fluff 9. The picked-up image is binarized, and is formed as a binarized image, and a line sensor 13 scans the vicinity of the unilluminated area side in a boundary between an unilluminated area and an illuminating area in the binarized image, and outputs it as an image scanning signal. A fluff judging circuit 14 measures a signal width of a signal extracted from the image scanning signal, and when the width is not more than a predetermined threshold value, it judges that the existence of the fluff is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package inspection device for detecting fluff generated on the end surface of a cheese-shaped yarn package.

[0002]

2. Description of the Related Art In a cheese-shaped yarn package, fluff occurs on the end face of the package when a single yarn is cut, winding is bad, or uneven drawing occurs during the yarn making operation. The form and extent of the fluff determines the quality rating of the rolled package. Therefore, the fluff generated on the end surface of the cheese-shaped yarn package is inspected using a package inspection device.

A conventional package inspecting apparatus for detecting fluff generated on the surface of a yarn manufacturing package includes a light projecting means, a fluff upright means, a light receiving element, a photoelectric conversion circuit, a pass filter circuit, a binarization circuit and a counting circuit. And a light receiving means consisting of. Then, first, the scanning laser light from the light projecting means scans the surface of the yarn or woven fabric in parallel. On the other hand, fluff erecting means based on air blowing, suction or electrostatic induction erects the fluff generated on the surface of the yarn making or the woven fabric. The scanning laser light is then diffusely reflected as it crosses the upright fluff at approximately a right angle. The pulsed diffused light generated at this time is received by a light receiving element, and further, the degree of fuzz is detected through signal processing by a photoelectric conversion circuit, a pass filter circuit, a binarization circuit and a counting circuit.

[0004]

In the conventional structure, when the end face of the package is inspected, planar light is emitted parallel to the end face. Therefore, when a bulge, a V-shaped step, a ring-shaped step, or the like is formed on the end surface of the package, the irradiation light is blocked by these and it becomes difficult to irradiate the fluff. At the same time, the light receiving element is also installed in parallel along the end face. Therefore, if there is a bulge, a V-shaped step, a ring-shaped step, or the like, it is difficult for the scattered light due to the fluff to be intercepted by these and received.

The present invention solves the above problems and, even when a bulge, a V-shaped step, or a ring-shaped step is formed on the end face of a cheese-shaped yarn package, the package is not hindered by these. An object of the present invention is to obtain a package inspection device that detects fluff generated on the end face.

[0006]

SUMMARY OF THE INVENTION A package inspection device according to the present invention is a package inspection device for inspecting fluff generated on an end surface of a cheese-shaped yarn package, which comprises a light projecting means, a fluff guiding means, and an image pickup means. An image binarizing unit, a one-dimensional scanning unit, and a fluff determining unit are provided, and a light projecting unit arranged in a direction facing the package end face is provided on the package end face along the radiation from the center of the package end face to the outer edge. A fluff guiding means that illuminates a limited band-shaped area and causes fluff in the illuminated area from the package end surface by electrostatic induction is arranged in a direction facing the package end surface, and the fluff tip moves the fluff away from the illuminated area. The image pickup means arranged on the side opposite to the fluff guiding means with the illuminated area interposed therebetween causes the non-illuminated area on the end face of the package. The illuminated area and the non-illuminated area are imaged from the angle captured as the background of the fluff, and the image binarizing means binarizes the imaged image by a predetermined threshold value of the image intensity, thereby binarizing the image. The one-dimensional scanning means scans the vicinity of the boundary between the non-illuminated area and the illuminated area in the binarized image on the non-illuminated area side, and outputs the image scanning signal. A signal of a predetermined threshold value or more is extracted from the image scanning signal, the signal width of the extracted signal is measured, and if the measured signal width is less than or equal to a predetermined threshold value, The feature is that it is determined that the presence is detected.

As the light projecting means of the present invention, a laser oscillator for irradiating the band-shaped light diffused by the cylindrical lens can be used. A CCD camera can be used as the image capturing means. Further, as the one-dimensional scanning means, a line sensor such as a CRT that directly measures on the screen of a display device can be used.

By irradiating the strip-shaped laser light from the direction opposite to the end face of the package, the fluff can be illuminated without being obstructed by the bulge or the like. Further, the fluff guiding device having a predetermined angle causes fluff generated on the end surface of the package. And the scattered light by the fluff is obtained. This scattered light is received by a CCD camera installed at a predetermined angle so as not to be blocked by a bulge or the like, and this image signal is binarized by a binarization circuit.
The binarized image is displayed on the screen of the display device, and the signal width is measured by the line sensor. Then, the comparison / counter circuit counts the signals having a signal width equal to or smaller than a predetermined threshold. As a result, even if a bulge, a ridge, or a step is formed on the package end surface, the fluff generated on the package end surface can be detected without being obstructed by these.

In the present invention, the direction of irradiating light by the light projecting means is within ± 20 ° from the direction perpendicular to the package end surface, and the direction of causing fluff by the fluff guiding means is from the package end surface. 45 ° elevation
More preferably, it is within a range of ± 20 °, and the direction of the visual axis of the image capturing means is within a range of an elevation angle of 45 ° ± 20 ° from the end face of the package. As a result, it is possible to capture a better fluff image without being affected by bulging or the like.

Further, the package is rotated with the central axis of the package perpendicular to the package end face as a rotation axis, the illumination area by the light projecting means scans the entire circumference of the package end face, and the fluff detecting means detects the number of fluffs. It is preferable to count. As a result, it is possible to efficiently perform the fluff inspection over the entire end surface of the package.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a layout view of a package inspection apparatus showing an embodiment of the present invention, and FIG. 2 is a front layout view of a package end face side.
FIG. 3 is a binarized image displayed on the image display device.

In the figure, 1 is a cheese-shaped yarn package,
2 is an end face of the package 1, 3 is a bulge generated on the end face of the package, 4 is a light projecting means composed of a laser oscillator 5 and a cylindrical lens 6, 7 is a band-shaped illumination area on the end face 2 of the package, and 8 is a fuzz guide. Device, 9 fluff caused by the fluff guiding device 8, 10 CCD camera,
11 is a binarization circuit, 12 is an image display device, 13 is a line sensor, 14 is a fluff determination circuit, 15 is an illumination area image, 1
6 is a non-illuminated area image, 17 is a fluff image, and 18 is a scanning position by the line sensor 13.

The light projecting means 4 is arranged in a direction facing the package end surface 2. In the embodiment of FIG. 1, the end faces are substantially perpendicular to each other. And laser oscillator 5
The spot-shaped laser light oscillated from is diffused into a band by the cylindrical lens 6 and illuminates the band-shaped region 7 on the package end face 2. This strip-shaped illumination area 7
Is along a radial line from the center of the circular package end surface 2 to the outer edge.

The fluff induction device 8 is arranged in a direction opposite to the end face of the package and generates a static induction phenomenon by applying a high voltage. In the embodiment of FIG. 1, the fluff guiding device 8 is arranged parallel to the illumination area 7 and at an angle of elevation of about 45 ° from the package end face 2. As a result, the fluff guiding device 8 moves toward the package end surface 2
The fluff generated in the direction is caused in the direction in which its tip moves away from the illumination area 7.

The CCD camera 10 is arranged on the opposite side of the fluff guiding device 8 with the illumination area 7 in between, and images the illumination area 7 and the non-illumination area. At that time, the CCD camera 10 takes an image from an angle that is not obstructed by the bulge 3 and that overlaps the non-illuminated area on the end face of the package as the background of the fluff 9 that has been caused. In the embodiment shown in FIG. 1, the CCD camera 10 is arranged at an angle at which the elevation angle from the package end face 2 is approximately 30 °.

The picked-up image is first binarized by the binarizing circuit 11 based on a threshold value of the image intensity determined in advance. Then, the binarized image is displayed on the screen of the image display device 12. The binarized image shown in FIG. 3 includes an illuminated area image 15, a non-illuminated area image 16 and a fluff image 17. Here, the fluff image 17 is recognized in a form protruding from the illumination area image 15 into the non-illumination area image 16. The illumination area image 15 does not always have a beautiful band shape due to the unevenness of the surface of the package end surface 2, the optical characteristics of the light projecting unit 4, and the like.

Therefore, with the line sensor 13, at the boundary between the non-illuminated area image 16 and the illuminated area image 15 in the binarized image,
The vicinity of the non-illuminated area image 16 side on the fluff guiding device 8 side is scanned. The broken line 18 in FIG. 3 represents the scanning position of the line sensor 13 in a simulated manner.

The image scanning signal thus obtained includes the component scanned by the fluff image 17 as well as the component scanned by the illumination area image 15. Therefore, the fluff determination circuit 14 first extracts from the image scanning signal a signal whose signal intensity is equal to or higher than a predetermined threshold value. Thereby, the component of the fluff image 17 and the component of the illumination area image 15 are extracted. Here, the signal width related to the fluff is significantly narrower than the signal width related to the illumination area. Then, the signal width of the extracted signal is measured, and when the measured signal width is less than or equal to a predetermined threshold value, it is determined that the presence of fluff is detected.

[0019]

As described above, according to the present invention, it is possible to detect the fluff on the end surface of the package without being obstructed by the bulge, the shape of the bulge, or the step. Therefore, it is possible to accurately determine the quality of the package by automatically and accurately detecting the fluff that has occurred on the end surface of the package even if the package has obstacles such as bulges, crosses, and steps in the inspection process. The present invention realizes an excellent package inspection apparatus that can automate the inspection process that relied on the above and can manage the package inspection according to a certain management standard.

[Brief description of drawings]

FIG. 1 Arrangement of package inspection device

[Fig. 2] Package front side layout

FIG. 3 Binary image

[Explanation of symbols]

 1 yarn package 2 package end face 3 bulge 4 light emitting means 5 laser oscillator 6 cylindrical lens 7 illumination area 8 fluff guiding device 9 fluff induced 10 CCD camera 11 binarization circuit 12 image display device 13 line sensor 14 fluff judgment circuit 15 Illuminated area image 16 Non-illuminated area image 17 Fluff image 18 Line sensor scanning position

Claims (3)

[Claims] 1. A package inspecting device for inspecting fluff generated on an end face of a cheese-shaped yarn package, which includes a light projecting means, a fluff guiding means, an image capturing means, an image binarizing means, a one-dimensional scanning means, and a fluff determination. Means for illuminating a limited strip-shaped region on the package end face along the radiation extending from the center of the package end face to the outer edge, in the illumination area. A fluff guiding means that causes fluff from the package end surface by electrostatic induction is arranged in a direction facing the package end surface, and causes fluff in a direction in which the tip of the fluff moves away from the illumination area. The image pickup means arranged on the opposite side from the angle where the non-illuminated area on the end face of the package is imaged as the background of the fluff caused, And the non-illuminated area are imaged, and the image binarizing means binarizes the captured image into a binarized image according to a predetermined threshold value of the image intensity, and the non-illuminated area and the illuminated area in the binarized image. The one-dimensional scanning means scans the vicinity of the non-illumination area side of the boundary between and, and outputs it as an image scanning signal. First, the fluff determination means outputs a signal whose signal intensity is equal to or higher than a predetermined threshold value from the image scanning signal. A package characterized by extracting, further measuring the signal width of the extracted signal, and determining that the presence of fluff is detected when the measured signal width is less than or equal to a predetermined threshold value. Inspection device. 2. The direction in which light is emitted by the light projecting means is
The angle is within ± 20 ° from the direction perpendicular to the package end face, the direction in which fluff is induced by the fluff guiding means is within the range of an elevation angle of 45 ° ± 20 ° from the package end face, and the visual axis of the image capturing means. 2. The package inspection apparatus according to claim 1, wherein the angle of elevation is within a range of 45 ° ± 20 ° from the end face of the package. 3. The package is rotated about a central axis of the package which is perpendicular to the package end face as a rotation axis, the illumination area by the light projecting unit scans the entire circumference of the package end face, and the fluff detecting unit detects the number of fluffs. The package inspection device according to claim 1, wherein the package inspection device counts.