JP3038262B2 - Sheet defect detecting device in automatic defect inspection device for belt-shaped sheet - 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 for rewinding a belt-shaped sheet on which a predetermined image such as a character or a pattern is printed, or a web roll wound with a plain belt-shaped sheet.
In the process of winding on the winding shaft, the surface of the sheet is automatically detected, such as dirt on the sheet surface, a defective portion such as a defective portion, and a defect automatic inspection device for a strip-shaped sheet for performing the inspection.
The present invention relates to a sheet defect detecting device capable of immediately switching a light projecting method between a transparent material and an opaque material only by changing a supporting position of the material.

[0002]

2. Description of the Related Art Prior to the present application, one of the present applicants has stated that "an unwinding shaft for mounting a web roll wound around a belt-shaped sheet and a belt-shaped sheet unwound from the web roll. And a sheet defect detection device having a camera device for projecting an image of the band-shaped sheet wound around the winding shaft, and a sheet outside the defective portion when the defective portion of the band-shaped sheet arrives. A label applicator for attaching a label to a surface, an inspection section arranged upstream of the winding shaft for inspecting a defective portion of the strip-shaped sheet, and an unwinder arranged downstream of the inspection section. A label detection sensor for detecting the passage of the label attached to the belt-like sheet wound around the shaft, and operating the label attaching device based on a detection signal of the sheet defect detecting device, and applying the label attaching signal to the label attaching device. The rotation of the winding shaft is stopped by rotating the unwinding shaft in the reverse direction, and the passage of the label attached to the belt-shaped sheet wound on the unwinding shaft is detected by the label detection sensor to detect the unwinding shaft. Of the belt-shaped sheet is automatically stopped so that the label sticking portion of the band-shaped sheet is stopped at the front surface of the inspection part to inspect the defective part of the band-shaped sheet.

In the apparatus for automatically inspecting defects of a strip-shaped sheet, there are cases where the strip-shaped sheet to be inspected is a transparent material represented by a transparent plastic film and a case where the strip-shaped sheet is an opaque material such as paper or aluminum foil. is there. When the band-shaped sheet is made of a transparent material, light is projected from below the band-shaped sheet traveling on the sheet defect detecting device, and the image is projected on a camera device. On the other hand, when the belt-shaped sheet is made of an opaque material, light cannot be transmitted from below, so that light is projected from above and reflected on the sheet surface, and the image is projected by a camera device. Therefore, in order to inspect the defective portion of each of the strip-shaped sheets made of a transparent material and an opaque material by the same device, it is necessary to change the light projection method of the portion of the sheet defect detecting device.

[0004]

SUMMARY OF THE INVENTION In view of such circumstances, the present invention is directed to a method of projecting light in a sheet defect detecting apparatus when the material of a belt-like sheet to be inspected is changed in the same apparatus. The purpose of the present invention is to make it possible to change the information immediately and to respond to such a situation.

[0005]

In order to solve the above-mentioned problem, a means adopted in the present invention is a system for automatically detecting a defect in a strip-shaped sheet by projecting an image of the strip-shaped sheet in an automatic defect inspection apparatus for a strip-shaped sheet. An upper illuminator for projecting the belt-like sheet from above, and a lower detector for projecting the belt-like sheet from below, which is disposed below the upper illuminator and raised and lowered by elevating means. A lower illuminator, and a first illuminator arranged on one side of the lower illuminator in parallel with the lower illuminator.
, And a second guide roller disposed on the other side of the lower illumination unit in parallel with the first guide roller, and at least one of the first and second guide rollers Is made movable in the running direction of the belt-shaped sheet.

[0006]

When the belt-like sheet to be inspected is made of a transparent material, the first and second guide rollers are separated from each other, and the lower illuminating section is raised by the raising / lowering means, so that the first and second guide rollers are raised. The camera device is disposed between the guide rollers, and the focal point of the camera device is located between the first and second guide rollers. As a result, the light projected from the lower illumination unit passes through the belt-shaped sheet, and in this state, an image of the belt-shaped sheet is projected by the camera device. On the other hand, when the belt-shaped sheet is made of an opaque material, the lower illumination unit is lowered by the lifting / lowering means, and one of the first and second guide rollers is moved along the running direction of the belt-shaped sheet. The top is stopped at a position slightly too far from the focal position of the camera device. In this state, a part of the light emitted from the upper illumination unit is reflected by the curved portion of the guide roller and proceeds immediately above and enters the camera device, whereby an image of the strip sheet made of an opaque material is projected. . Thus, the light projection method in the sheet defect detecting device can be immediately changed depending on the material of the belt-like sheet to be inspected.

[0007]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. In Figure 1, the machine frame 1 is provided in the defect automatic inspection apparatus A of the belt-like sheet, the bottom of one side of the machine base 1, by winding a strip-shaped sheet S raw B - Le R ₁ A pair of unwinding shafts 2 for mounting are provided to face each other.
At the bottom of the other side of the machine base 1, the raw Hanro - winding Toro was wound strip sheet S unwound from Le R ₁ - le R
_A pair of winding shafts 3 for supporting the pair 2 are provided to face each other. As shown in FIG. 2, a pair of frames 4, 4 are provided at the upper portion on both sides of the center of the machine base 1, and a sheet defect detecting device 5 is fixed to a horizontal portion of both frames 4. The sheet defect detection device 5 includes a camera device 6 and
It has an upper lighting unit 12 and a lower lighting unit 15. The camera device 6 has a box shape, and accommodates a plurality of (six in the illustrated example) cameras 7 with the lens 7a facing downward. As will be described later, each of the cameras 7 constituting the camera device 6 can capture a portion of the belt-shaped sheet S running continuously thereunder in the width direction and overlapping each other when photographing a defect of the belt-shaped sheet S. The belt-shaped sheet S is arranged so as not to leak. The camera device 6 is provided with a pair of arm portions 8 protruding from the end surfaces on both end surfaces in the longitudinal direction, and each of the arm portions 8 is fixed to the frame 4 on both sides by a suitable number of bolts. Is supported by a channel-like camera support fitting 11 attached to the upper part of the support fitting 9 so as to be able to move up and down. As described above, the cameras 7 attached to the frames 4 on both sides via the support brackets 9 and the camera support brackets 11 on both sides are arranged such that the axis C (see FIG. 3) of the lens 7a is vertical. It is installed. The reason why the camera device 6 is supported so as to be able to move up and down by the camera support bracket 11 is to focus the image on the image of the belt-shaped sheet S at the time of photographing.

As shown in FIG. 3, an upper illuminator 12 is provided below the camera device 6, and upper ends of both ends of the upper illuminator 12 are fixed to lower surfaces of both support fittings 9, respectively. A lens 7a of the camera 7 is provided on the shade 13 of the upper illumination unit 12.
A slit-shaped viewing window (not shown) having a predetermined width is formed along a portion corresponding to the lower part of the web.
The photographing range of the camera 7 is clarified. In the upper illumination unit 12, a pair of fluorescent lamps 14 are arranged in parallel at a predetermined angle with respect to the axis C of the lens 7a and symmetrically with each other.

Below the upper illumination section 12, the upper illumination section 1
A lower illumination unit 15 having the same length as 2 is provided.
The lower illumination unit 15 has cylinder fixing plates 17 attached to lower portions on both ends thereof. Each cylinder fixing plate 17 has a rod 18 a of a first cylinder 18 fixed vertically to a side of the machine base 1. Is screwed and fixed. A guide rod 19 having a lower end fixed to the machine base 1 is slidably inserted into a hole (not shown) formed in a side portion of the cylinder fixing plate 17. This guide rod 1
Reference numeral 9 is provided to maintain the vertical position of the rod 18a of the cylinder when the rod 18a moves up and down, and to set the rising end of the lower illumination unit 15 raised by the first cylinder 18.

One side of the first cylinder 18 (FIG. 3)
The first arm 21 provided on the right side of the first cylinder 18 is located on the side of the first cylinder 18, and the lower end thereof is connected to the machine base 1 by the lower shaft 2.
2 is attached to the shaft. The upper end of the first arm 21 is bent in a hook shape, and one end of a first guide roller 24 having substantially the same length as the lower illumination unit 15 is formed by an upper shaft 23 attached to the upper end. The part is rotatably supported. The other end of the first guide roller 24 is rotatably supported by another first arm 21 provided on the other side of the machine base 1. The second cylinder 25 has its rod 25
a of a first arm 21 is pivotally attached to a bent portion of the first arm 21 by a pin 26.
Is attached to a bracket 27 provided outside the vertical portion of the frame 4 by a pin 28. For this reason,
When the second cylinders 25 on both sides are operated, the rod 2
When the first arm 21 is protruded, the first arm 21 is rotated counterclockwise in FIG.
The first guide roller 24 is made to protrude in the direction of the lower illumination unit 15, and the second cylinder 25 is operated to operate the rod 25.
When “a” is pulled in, the first arm 21 rotates clockwise to move the first guide roller 24 in a direction away from the lower illumination unit 15.

The second guide roller 29 is provided in the lower illumination section 15.
The first guide roller 24 is opposed to the first guide roller 24 and is disposed in parallel with the first guide roller 24. The center of the pair of second arms 32 is attached to the machine base 1 via the lower shaft 31.
The guide roller 29 is rotatably supported at both ends by an upper shaft 33 attached to the upper ends of the pair of second arms 32 (the second arm 3 on one side in FIG. 3).
2 only). One end of a tension spring 34 is attached to the lower end of the second arm 32, and the other end of the tension spring 34 is attached to a bracket 35 fixed to the machine base 1. For this reason, the second arm 32 is always rotated clockwise about the lower shaft 31 by the urging force of the tension spring 34, but when the second arm 32 is vertical, the outer surface of the second arm 32 is The upper portion abuts against the lower stopper 36 fixed to the machine base 1 and stops its rotation. Above the lower stopper 36, a second arm 32 is provided with a tension spring 34.
The upper stopper 37 is fixed to the machine base 1 to abut against the outer surface of the second arm 32 to stop the movement when the second arm 32 is rotated counterclockwise against the urging force of the second arm 32.

A guide roller 38 is provided obliquely above the first guide roller 24, and a guide roller 39 is provided obliquely below the first guide roller 24. Further, a guide roller 41 is provided obliquely below the second guide roller 29. Then, in FIG. 1, an original fabric roll R ₁ wound on the belt-like sheet S, the original fabric roll R ₁ near through the guide rollers 42 and 43, a sheet defect detecting device 5 via further guide rollers 38 and 39 It flows from the upper part of the first guide roller 24 to the upper part of the second guide roller 29, passes through the guide roller 41, and from the guide rollers 44, 45 arranged at the upper rear part of the machine base 1 to the lower guide rollers 46, 47. After that, it is wound on the winding shaft 3. Here, the label sticking device 48 attached to the machine base 1 above the two guide rollers 44 and 45 detects defects such as dirt on the sheet surface and defective portions in the image of the belt-like sheet S by the sheet defect detecting device 5. In this case, a label is attached to the side of the image of the defective portion of the belt-shaped sheet S by a signal sent from the sheet defect detecting device 5. An inspection unit 49 is provided below the label attaching device 48. The inspection unit 49 is a part for visually confirming a defect of the band-shaped sheet S to which the label is attached. This inspection part 49
A label detection sensor 51 is provided below the box. The label detecting sensor 51 stops the winding shaft 3 by sticking signal of the label pinning 48, by reversely rotating the unwinding shaft 2, the winding take - a strip sheet S wound in Le R ₂ When rewinding, it is a sensor for detecting the passage of the label attached thereto and stopping the reverse rotation of the unwinding shaft 2. In FIG. 1, reference numeral 52 denotes a drive motor for rotating the unwinding shaft 2 and the winding shaft 3 forward and backward.

The first and second guide rollers 24 and 29 are shown in FIG. 3 in order for the sheet defect detecting device 5 to detect a defect of the strip S made of a transparent material such as a transparent plastic film. It is necessary to arrange.
Therefore, the second cylinder 25 is operated to rotate the first arm 21 clockwise, and the
The stopper 30 is fixed to the stopper 30. In this state, the first cylinder 18 is operated to raise the lower illumination unit 15 to the rising end. Also, the second guide roller 29
The second arm 32 supporting the lower illumination unit 15 is rotated clockwise by a tension spring 34 so that the lower surface of the lower end thereof abuts against a lower stopper 36.
It is located on the side of. Thus, both cylinders 1
8 and 25 to move the first guide roller 24 to the second
When the lower illumination unit 15 is positioned at the rising end, the belt-shaped sheet S supported by the two guide rollers moves below the upper illumination unit 12 and the camera device 6.
Is perpendicular to the axis C of the lens 7a of the camera 7.
In this state, the band-shaped sheet S is placed on both fluorescent lamps 1 of the upper illumination unit 12.
4 emits light from the upper part on both sides, and the lower illumination part 15
The fluorescent lamp 16 emits light from directly below the belt-shaped sheet S.
The light emitted from the lower illuminating unit 15 passes through the band-shaped sheet S in the transparent unit, and is reflected in the image part, or only a part of the light is transmitted. Therefore, the light emitted from the lower illumination unit 15 makes the outline of the image portion of the belt-shaped sheet S clear. During the inspection of the belt-like sheet S by the sheet defect detecting device 5, while winding the belt-like sheet S original fabric roll R ₁ to the winding shaft 3 at a predetermined speed, although photographed by the camera 7, the camera 7 bevel 13 Since the reflected light of the image from the upper illumination unit 12 and the light indicating the image contour from the lower illumination unit 15 enter through the slit, the image can be accurately captured.

Next, when the band-shaped sheet S is made of an opaque material such as aluminum foil or paper, the light projected from the lower illumination unit 15 is not transmitted as described above. For this reason, FIG.
As shown in FIG. 5, after the first cylinder 18 is operated to lower the lower illumination unit 15, the second cylinder 25 is operated to move the first arm 21 counterclockwise around the lower shaft 22. Rotate. As a result of this rotation, the first guide roller 24 moves above the lower illumination section 15 and then abuts against the second guide roller 29 to further push the second guide roller 29 outward. Thus, when the second guide roller 29 is pushed outward, the second arm 3
The second guide roller 29 is stopped, and the first guide roller 24 is stopped at the same time. In this state, as shown in FIG. 5, the top 24a of the first guide roller 24 is located at each point where the axis C of the lens 7a of each camera 7 intersects with the outer peripheral surface of the first guide roller 24. Are located slightly in excess of the line L connecting in the direction of the second guide roller 29. Therefore, the first guide roller 2 is moved upward from the lower guide roller 39.
As shown in FIG. 5, the belt-shaped sheet S hung on the line 4 is in close contact with the outer peripheral surface of the first guide roller 24 at the line L, and the center O of the first guide roller 24 and a point on the line L. Is intersected at an intersection angle (θ) with the axis C of the lens 7a. Therefore, a part of the light N emitted from the upper illumination unit 12 is reflected on the upper surface of the belt-shaped sheet S, advances along the axis C of the lens 7a, and the image is clearly displayed.

When the image of the band-like sheet S made of a transparent material is projected by the sheet defect detecting device 5, the distance between the first and second guide rollers 24 and 29 is made as short as possible. The running of the belt-like sheet during traveling can be prevented, and the image capturing accuracy can be improved. For this reason,
In the above embodiment, the second guide roller 29 is pressed and moved by the first guide roller 24 when photographing a belt-like sheet made of an opaque material. However, the structure is such that the two guide rollers 24 and 29 do not contact each other. You may.

[0016]

According to the present invention, when the material of the belt-like sheet to be inspected is changed in the automatic defect inspection apparatus for one belt-like sheet, this is constituted.
And raising and lowering the lower illumination part in the defect detection device,
By moving either one of the first and second guide rollers in the traveling direction of the belt-like sheet, the light projection method can be changed immediately, and the function as an apparatus is increased, and versatility is enhanced. In addition, one of the first and second guide rollers constituting the sheet defect detecting device is urged to the other side by the urging means, and the guide roller having no urging means is moved to the belt-shaped sheet. If the guide roller is moved in the traveling direction and pressed against the other guide roller against the urging force of the urging means, the gap between the first and second guide rollers when inspecting a strip-shaped sheet made of a transparent material. Can be reduced, and the deflection of the belt-like sheet traveling on the inspection unit can be reduced, and as a result, the inspection accuracy increases.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of an automatic defect inspection apparatus for a strip-shaped sheet provided with a sheet defect detection device 5 according to the present invention.

FIG. 2 is a front view of a part (inside a camera box) of the sheet defect detecting device 5;

FIG. 3 is an enlarged side view of a portion of the sheet defect detection device 5 when photographing a belt-like sheet made of a transparent material.

FIG. 4 is an enlarged side view of a portion of the sheet defect detecting device 5 when photographing a strip-shaped sheet made of an opaque material.

FIG. 5 is an explanatory diagram showing a light reflection state during photographing of a band-shaped sheet made of an opaque material.

[Explanation of symbols]

 A: Automatic defect inspection apparatus for strip-shaped sheet C: Lens axis S: Strip-shaped sheet 1: Machine base 5: Sheet defect detection apparatus 6: Camera device 7: Camera 12: Upper illumination unit 15: Lower illumination unit 18: First Cylinder (elevating means for lower illumination part) 24: First guide roller 29: Second guide roller 34: Tension spring (biasing means)

Claims (2)

(57) [Claims] 1. An unwinding shaft for mounting an original roll on which a belt-like sheet is wound, a winding shaft for winding up a belt-like sheet unwound from the raw roll, and winding around the winding shaft A sheet defect detecting device including a camera device for projecting an image of a strip-shaped sheet to be taken, and a label sticker for attaching a label to a sheet surface outside the defective portion when a defective portion of the strip-shaped sheet arrives; An inspection unit arranged upstream of the winding shaft for inspecting a defective portion of the belt-shaped sheet; and the label attached to the band sheet arranged downstream of the inspection unit and wound on the unwinding shaft. And a label detecting sensor for detecting the passage of the label. The label attaching device is operated by the detection signal of the sheet defect detecting device, and the rotation of the winding shaft is stopped by the attaching signal of the label attaching device. By rotating the unwinding shaft in reverse, the label detection sensor detects the passage of the label attached to the band-shaped sheet wound on the unwinding shaft, and stops the rotation of the unwinding shaft. In the automatic defect detecting apparatus for a belt-shaped sheet configured to stop the attaching portion at a front surface of the inspection section and inspect the defective section of the belt-shaped sheet, the sheet defect detecting apparatus includes an upper part for projecting the belt-shaped sheet from above. An illuminating section, a lower illuminating section disposed below the upper illuminating section and raised and lowered by elevating means to project the band-shaped sheet from below, and a lower illuminating section on one side of the lower illuminating section. A first guide roller arranged in parallel with the illumination unit, and a second guide roller arranged in parallel with the first guide roller on the other side of the lower illumination unit, 1st and 2nd guideways If at least one of the rollers is movable in the running direction of the band-shaped sheet, and the band-shaped sheet to be inspected is made of a transparent material, the first and second guide rollers are separated from each other to raise and lower Raising the lower illuminating unit and disposing it between the first and second guide rollers so that the focal point of the camera device is located between the first and second guide rollers;
When the strip-shaped sheet is made of an opaque material, the lower illumination unit is lowered by the lifting / lowering means, and one of the first and second guide rollers is moved, and the top is moved from the focal position of the camera device. A sheet defect detecting apparatus in an automatic defect inspection apparatus for a belt-shaped sheet, wherein the apparatus is configured to be stopped at a position slightly too far. 2. One of the first and second guide rollers is urged to the other side by an urging means, and the guide roller having no urging means is moved in the traveling direction of the belt-shaped sheet. 2. The sheet defect detecting apparatus according to claim 1, wherein the other guide roller is configured to be pressed against the urging force of the urging means.