JP3343950B2 - Guide roller burr detection 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 detecting burrs of a guide roller for transporting a band such as a magnetic tape.

[0002]

2. Description of the Related Art In a video tape recorder or a video camera, a guide roller is used as a means for guiding the transfer of a magnetic tape as a magnetic recording medium. In order to cope with the problem, the size and precision of the guide roller have been reduced. In this type of guide roller, a flange is attached to each of the top and intermediate portions of the roller shaft, and a rotatable roller is attached to the roller shaft between the flanges via a bearing. The magnetic tape is guided by the surface.

[0003]

By the way, in such a guide roller, the roller and its bearing are formed by cutting, and burrs are generated on the end face portion during the processing. It is necessary to remove such burrs by a process such as polishing during the assembly, but even by such a process, it is difficult to remove reliably because the parts themselves are fine.

If such burrs remain on rollers and bearings, the burrs fall off due to rotation,
Rotational unevenness will be caused. In particular, if the dust adheres to the magnetic tape to be transferred, it may cause an image or the like to be disturbed.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method and an apparatus for detecting burrs of a guide roller having burrs that cause a rotation obstacle or the like.

[0006]

According to the present invention, there is provided a method for detecting burrs of a guide roller, wherein a flange (upper flange 6 and lower flange 8) is attached to the top and middle of a roller shaft (4), and the roller shaft between the flanges is provided. Roller (10) rotatable up
And a reference line (A, B, C) is set on an image based on the roller shaft or the flange, and the guide roller is rotated based on the reference line. Search for the contour over the entire circumference of the roller,
The height of the burrs (36, 38) projecting from the end face of the contour is detected.

In the guide roller burring detection device of the present invention, flanges (upper flange 6 and lower flange 8) are attached to the top and intermediate portions of the roller shaft (4), and can be rotated on the roller shaft between the flanges. a burr detecting device of the roller (10) mounting the guide rollers (2) to be, the moth
A rotation device (16) for rotating an idler roller; and an image pickup means (camera 21, camera) for photographing the flange of the guide roller and the end face of the roller as a field of view (24, 26).
22) and a reference line (A, B, B) based on the roller shaft or the flange on the image obtained from the imaging means.
C, D, E), and display means (monitor device 32) for superimposing and displaying the reference line on the image representing the visual field;
Detecting means (control device 1) for detecting the height of a beam projecting from the end face of the rotating roller based on the reference line;
8).

[0008]

[Function] A reference line is displayed on the image with reference to the roller shaft or flange along with a part of the guide roller, and the height of the burrs is within an allowable range with respect to the guide roller portion and the reference line displayed on the image. The quality of the guide roller is determined by detecting whether the guide roller is present.

An image of the flash detection area is photographed by an image pickup means in which the flange of the guide roller and the end face of the roller are set in the field of view. A reference line is set on the basis of a roller shaft or a flange on an image obtained from the imaging means, and the reference line is visually displayed on the image. The height of the burrs protruding from the end face of the roller is detected based on this reference line, and it is determined whether or not the height is within an allowable range.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments shown in the drawings.

FIG. 1 shows an embodiment of a flash detecting device used in the guide roller flash detecting method of the present invention. The guide roller 2 to be inspected for burrs has an upper flange 6 on the top side of a roller shaft 4 having a cylindrical shape, and a lower flange 8 on an intermediate side, and the roller is disposed within the interval between the upper flange 6 and the lower flange 8. 10 is mounted so as to rotate with a bearing 12 interposed therebetween. The roller shaft 4 protruding from the lower surface side of the lower flange 8 forms a support portion for fixing to a device main body such as a VTR or a video tape recorder.

The flash detecting device is provided with a chuck device 14 as a holding means for holding the guide roller 2 when inspecting the guide roller 2, and the roller shaft 4 is held by the chuck device 14. A rotating device 16 is associated with the chuck device 14, and the held guide roller 2 is forcibly rotated together with the chuck device 14 by the rotating device 16. The chuck device 14 and the rotating device 16 include the control device 1
8 are coordinated with each other, and each control of gripping and releasing the guide roller 2 and rotation by the rotation device 16 is performed by the control device 1.
8 control operation.

The control unit 18 is constituted by, for example, a microcomputer, and has an input / output unit for taking in various detection data or generating a control output, a central processing unit for taking in the data and performing arithmetic processing, and a control unit for arithmetic control. The ROM includes a ROM in which a control program and various fixed data to be referred to during the calculation are written, a RAM to which various data in the calculation are written as needed. Control device 18 of this embodiment
Since the burrs are used to determine whether or not burrs are non-defective through video processing, the burrs are configured as various types of detection means such as a video control means and a determination program.

Then, first and second cameras 21 and 22 are provided as imaging means for the guide roller 2 held by the chuck device 14. Each camera 21, 22
For example, a camera using a CCD image sensor is used. In this burr inspection, the burr inspection area of the guide roller 2 is set on the upper flange 6 side and the lower flange 8 side, and the camera 21 is installed on the upper flange 6 side and the camera 22 is installed on the lower flange 8 side. I have. 24 is a field of view set for the camera 21, and 26 is a field of view set for the camera 22.

The video output of each of the cameras 21 and 22 is individually applied to video processing circuits 28 and 30 and, after undergoing signal processing required for video display, is taken into the control device 18.
On the output side of the control device 18, a monitor device 32 is installed as display means. This monitor device 32 has a CR
It is constituted by a T display device or the like, and selectively displays images of the visual fields 24 and 26, and superimposes and displays a reference line and the like required for flash detection.

A sorting device 34 is connected to the control device 18. The sorting device 34 sorts the inspected guide roller 2 based on the result of discriminating whether the inspected guide roller 2 is good or defective. It is what you do.

Next, FIG. 2 shows a state of occurrence of burrs 36 and 38 in the visual fields 24 and 26 in the guide roller 2 shown in FIG. That is, in the guide roller 2, the bearing 12 is fixed to the inside of the cylindrical roller 10 by mechanical fixing means such as press fitting. And the roller 10
The bearing 12 and the bearing 12 are both machined, and burrs 36 and 38, chips, and the like adhere to and remain on the end surfaces thereof. In this example, a burr 36 protrudes from the end face of the bearing 12 on the side of the visual field 24, and a burr 38 protrudes from the lower end face of the roller 10 on the side of the visual field 26. In this case, although not shown, burrs may occur on the upper end surface of the roller 10 on the side of the visual field 24.

Next, FIGS. 3 and 4 are flowcharts showing an embodiment of the flash detection method of the present invention, and the flash detection method will be described with reference to this flowchart.

Prior to the inspection, the control device 18 is initialized, and the cameras 21, 22 and the monitor device 32 are operated. The images of the cameras 21 and 22 are selectively displayed by switching of the control device 18. 5A shows an image representing the visual field 24, and FIG. 5B shows an image representing the visual field 26. In the images shown in FIG. 5A and FIG. 2 shows each part of the roller 2. Reference numeral 40 denotes a roller shaft surface, and reference numeral 42 denotes a peripheral surface of the lower flange 8.

In the burr inspection on the upper flange 6 side, in FIG. 3 and FIG. 5A, the end face of the roller 10 on the upper flange 6 side is searched in step S1, and in step S2, the roller Search for the surface of axis 4. A boundary point a between the roller shaft 4 and the upper flange 6 and a boundary point b between the roller shaft 4 and the bearing 12 are searched, and a center line n ₁ orthogonal to the roller shaft 4 is formed at the center between the boundary points a and b. This center line n ₁
Is displayed on the screen of the monitor device 32 on the image representing the visual field 24.

Next, in step S3, as shown in FIG. 5A, a center line n _{1 is set} on the image, and reference lines A, B and C are set on the contours on the bearing 12 and roller 10 side. . Next, in step S4, the burrs on the end face of the roller 10 are searched for all the dots on the reference line A while rotating the roller 10. Arrows P ₁ , P ₂ , and P ₃ indicate search directions at a specific dot.

In the embodiment, a flash 36 is provided on the end face of the bearing 12.
There is present, at step S5, the presence and size difference Delta] h ₁ thereof the burr 36 is searched. In step S5, the interval m ₁ between the reference line A and reference line B, and the interval m ₂ is searched with the reference line A and reference line C, and this search, the actual height of the burr 36 h When _1, the dimensional difference Delta] h ₁ to be searched is given by m ₁ -h _1.

Next, it is determined whether the dimension difference Delta] h ₁ step S6 exceeds the permissible height hr _1. In the product,
It is impossible to eliminate the occurrence of burrs at all, and it is necessary to set a certain allowable range in determining the quality of a product. Here, in step S6, the preset permissible high hr ₁ against burr 36 occurs, the allowable height hr ₁ and the dimensional difference Δh
Determine the magnitude relationship with ₁ .

If the dimensional difference Δh ₁ of the burrs 36 does not exceed the allowable height hr ₁ in step S 6, the sorting device 34 is operated, and the process proceeds to step S 7 where the burrs are transferred as non-defective products.
If the dimensional difference Δh ₁ of the burrs 36 exceeds the allowable height hr ₁ in step S 6, the flow shifts to step S 8, where the burrs are collected as defective.

Next, in the burr inspection on the lower flange 8 side, the end face of the roller 10 on the lower flange 8 side is searched in step S11 in FIG.
Then, following the search, the outer surface of the protruding portion of the lower flange 8 is searched. The boundary point c between the peripheral surface of the lower flange 8 and the roller 10 and the boundary point d between the upper surface of the lower flange 8 and the bearing 12 are searched, and the center between the boundary points c and d is orthogonal to the peripheral surface of the lower flange 8. form a line n _2. The center line n ₂ is displayed on the screen of the monitor device 32, superimposed on the image representing the visual field 26.

Next, in step S13, FIG.
As shown in ( ₁₎ , reference lines D and E are set on the image on the bearing 12 and the center line n2, respectively. Next, step S14
Then, the burrs on the end face of the roller 10 are searched for all the dots of the reference line E while rotating the roller 10. Arrow P
_4, P ₅ shows a search direction at a particular dot.

In the embodiment, the burrs 3
8 are present, and in step S15, this flash 38
And the dimensional difference Δh ₂ are searched. In step S15, the distance m ₃ between the reference line D and the reference line E is searched. In this search, assuming that the actual height of the burrs 38 is h ₂ , the dimensional difference Δh ₂ to be searched is m ₃ -h ₂
Given by

Next, in step S16, the dimensional difference Δh ₂
It is equal to or exceeds the permissible height hr _2. In step S16, the allowable height hr ₂ for the generated burr 36 is determined.
Is set in advance, and the magnitude relationship between the allowable height hr ₂ and the dimensional difference Δh ₂ is determined.

In step S16, the dimensional difference Δh ₂ of the flash 38 is obtained.
Does not exceed the permissible height hr ₂ ,
Is operated and transported as good proceeds to step S17, also, if the size difference Delta] h ₂ of burr 38 exceeds the allowable height hr ₂ in step S16, proceeds to recover as defective in Step S18 I do.

In this embodiment, the search for the burrs 36 and 38 on the upper flange 6 and the lower flange 8 is described separately.
As described above, it is also possible to perform the processing individually and sequentially. Further, these search and determination operations can be performed simultaneously by time division control, and the inspection and sorting efficiency can be improved by the simultaneous processing.

In the embodiment, the case where two cameras 21 and 22 are installed corresponding to each part to be detected has been described. However, the present invention uses a single camera to correspond to the detection position. The shooting position may be changed, and in that case, the video processing circuits 28 and 30 can be unified.

[0032]

As described above, according to the present invention,
The flash generated on the guide roller can be efficiently detected while confirming the image on the video, and the quality can be determined.

Further, the inspection portion of the burrs generated on the guide roller is photographed by the imaging means, and a reference line is set and displayed on the image based on the roller shaft or the flange. Since the height of the burrs protruding from the end face is detected, the burrs can be detected with higher accuracy.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a guide roller burring detection method and apparatus according to the present invention.

FIG. 2 is a side view showing a guide roller to be inspected.

FIG. 3 is a flowchart illustrating an embodiment of a guide roller burr detection method.

FIG. 4 is a flowchart showing one embodiment of a guide roller burr detection method.

5 is a diagram showing a monitor image of a monitor device in the guide roller burr detection device shown in FIG.

[Explanation of symbols]

 2 Guide roller 4 Roller shaft 6 Upper flange 8 Lower flange 18 Control device (detection means) 21, 22 Camera (imaging means) 32 Monitor device (display means) 36, 38 Burr A, B, C, D, E Reference line

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shigeo Nakayama 1-7-1, Higashi-Ome, Ome-shi, Tokyo Inside Nippon Chemi-Con Corporation (56) References JP-A-3-27476 (JP, A) JP-A Sho 54 -17079 (JP, A) JP-A-60-247136 (JP, A) JP-A-3-110645 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 15/60

Claims (2)

(57) [Claims] 1. A method for detecting a burr of a guide roller, wherein a flange is attached to a top portion and an intermediate portion of a roller shaft, and a roller is rotatably mounted on the roller shaft between the flanges. To set a reference line on the image, and rotate the row based on this reference line.
A method for detecting burrs of a guide roller, comprising: searching for a contour over the entire circumference of a la, and detecting a height of a burr protruding from an end face of the contour . 2. A burr detecting device for a guide roller, wherein a flange is attached to a top portion and an intermediate portion of a roller shaft, and a roller is rotatably mounted on the roller shaft between the flanges, wherein the rotating device rotates the guide roller. When the imaging means for the flange and the end face of the roller of the guide rollers be taken as a viewing, set the reference line the roller shaft or the flange on the image obtained from the imaging means as a reference, the reference Display means for displaying a line superimposed on the image representing the visual field, and detecting means for detecting a height of a beam projecting from an end face of the rotating roller based on the reference line. Characteristic guide roller burr detection device.