JP3082755U - Rotating body surface inspection device - Google Patents

Abstract

(57) [Summary] (with correction) [Problem] To inspect surface defects such as pinholes, projections, foreign matter, and scratches on the surface of a rotating body such as a developing roll for a printer, or to chip the surface of a cylindrical rotating body such as a plug for an automobile. And a device for inspecting surface defects such as cracks. SOLUTION: Light is obliquely incident on a surface of a rotating body such as a developing roll for a printer from a line light guide 10 mounted on a mount movable in the axial direction of the rotary body, and is interlocked with the line light guide mounted on the mount. The reflected light is received and image-processed by the linear CCD camera 17 that moves, and the entire surface or a part of the rotating body is scanned by rotating the rotating body.
Inspect the surface of the rotating body for scratches, pinholes, protrusions, foreign matter, etc.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 Inspection of surface defects such as pinholes, projections, foreign matter, scratches and deposits on the surface of the rotating body such as developing rolls for printers, and inspection of surface defects such as chips, cracks and scratches on the surface of cylindrical rotating bodies such as automobile plugs Equipment used for surface defect inspection of rotating bodies.

[0002]

[Prior art]

 Conventionally, inspection of pinholes, protrusions, foreign matters, scratches, etc. on the surface of a rotating body such as a developing roll for a printer has been performed manually. As a result, it takes a lot of man-hours and the detection sensitivity varies, so that a so-called sensory test made it difficult to obtain a numerical test result and the productivity was low.

[0003]

[Means to be solved by the invention]

 Fig. 1 is an overall view to improve the sensitivity of inspection for foreign matter and scratches, pinholes, cracks, etc. on the surface of the rotating body such as a developing roll for printers, and to automate the inspection and to digitize the inspection results. Devices that show schematic diagrams in 2, 3, and 4 have been devised.

[0004]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a main part of the entire configuration of the present apparatus. In FIG. 1, 1 is a base, 2 is a column for supporting the object, 3 'is a spindle for rotating the object, 4 and 4' are roller shafts of the object, and 5 is a roll. A test object, 6 is a motor for rotating the test object, 7 is a rotation transmission rod, 8 and 8 'are pulleys, 9 is an optical fiber, 10 is a line light guide, 11 is a light guide lens, and 12 is a light guide lens. Motors for operating the linear drive mechanism, 13 and 13 'are guides for the linear drive mechanism, 14 is a slider for the linear drive mechanism, and 15 is a line light guide supporter, which is a mechanism for adjusting the incident angle of the light source as necessary. The reference numeral 16 denotes a light receiving lens, 17 denotes a linear CCD camera, and 100 denotes a path of a light beam emitted from a line light guide.

FIG. 2 is an enlarged view of a main part of a light path. 2, 3 and 4, each numeral indicates the same name as in FIG. In FIG. 2, θ1 is an incident angle between a ray emitted from the light guide lens 11 of the line light guide, which is substantially perpendicular to the axis of the test object 5, and a normal set on the surface of the test object 5. Similarly, θ2 indicates the reflection angle of the light beam reflected from 5. Figure 3 shows a schematic diagram of a pinhole reflection. In FIG. 3, reference numeral 5 denotes a cross section of the object to be inspected, 100 denotes a path of incident and outgoing light rays, and 200 denotes a concave scratch or a pinhole on the surface of the object to be inspected. FIG. 4 shows a schematic diagram of the reflection of foreign matter. In FIG. 4, reference numeral 300 denotes a foreign substance on the surface of the test object.

[0006]

[Action]

 The operation will be described with reference to the embodiment shown in FIG. 1 and the schematic diagrams shown in FIGS. In FIG. 1, an inspection object 5 which is, for example, a developing roll for a printer is supported so as to be rotatable by spindles 3 and 3 ', and a rotation drive from a motor 6 is transmitted by pulleys 8 and 8' to give rotation. Can be On the other hand, 14 linearly movable guide sliders are mounted on 13 and 13 'linearly movable sliders, are driven by 12 motors, and move at a constant speed from one end of 13 and 13' to the other.

[0007] Ten line light guides and 11 light guide lenses are mounted on 14 via a line light guide support 15, and 16 light receiving lenses and 17 light guide lenses are mounted on the same linear movable guide slider 14. A linear CCD camera is mounted, and moves with the relative positional relationship in accordance with the movement of 14. As a result, the light beam 100 scans the entire surface of the test object 5 by the rotation of 5 and the lateral movement of 14.

The light emitted from the light guide lens 11 reaches the light receiving lens 16 by following the path of 100, but the relative positional relationship between 11 and 16 does not change regardless of the movement of 14. That is, the light from, for example, a metal halide light source guided via 9 is incident on the surface of the test object 5 as a slit-like light beam via 11 via 10, and this state is shown in FIG. 2. In FIG. 2, for example, light incident at an angle θ1 = 45 ° is reflected at θ2 ≒ θ1 ≒ 45 °. The reflected light enters the 15 light receiving lenses, and is further imaged and image-processed by 16 CCD cameras.

[0009]

[Effect of the invention]

 As shown in FIG. 3, the reflected light from a dent such as a pinhole, a scratch, or a crack is generally darker than the average reflected light if the reflected light when the surface of the test object is normal is assumed to be the average reflected light. Also, as shown in FIG. 4, when the material of the roller is, for example, black rubber, the reflected light from adhering matter, foreign matter, protrusions and the like is generally brighter than the average reflected light of the black rubber. In addition, by adjusting the angle adjustment mechanism provided at 15, the incident angle of the light source hitting the test object, the detection sensitivity is adjusted to be almost the highest, so that the optimum test can be performed for each test object. Become.

Conventionally, it was very difficult to distinguish scratches, pinholes, foreign matter, etc. on the surface of a roller made of rubber or the like, but according to the present invention, it looks very bright or dark, and the contrast is very clear and detected. The sensitivity is greatly improved. Furthermore, compared to the conventional visual inspection method, no skill is required, and the defect can be quantitatively detected and inspected. Further, according to the present apparatus, it is possible to mechanically perform defect inspection in large quantities. It is also possible to operate the machine unattended, which is a great advantage in terms of productivity.

[Brief description of the drawings]

FIG. 1 is a main part of the entire configuration of a rotating body surface inspection apparatus.

FIG. 2 is an enlarged view of a main part of a light path.

FIG. 3 is a schematic diagram of a pinhole reflection.

FIG. 4 is a schematic diagram of foreign matter reflection.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base 5 ... Inspection object 6 ... Motor 10 ... Line light guide 11 ... Light guide lens 12 ... Motor 13 ... Linear drive mechanism guide 15 ...・ Supporting part provided with angle adjustment function 16 ・ ・ ・ Light receiving lens 17 ・ ・ ・ Linear CCD camera 100 ・ ・ Path of light ray 200 ・ ・ Concave scratch, pinhole 300 ・ ・ Foreign matter

Claims (4)

[Utility model registration claims] An object to be inspected is rotated by a driving device, and a slit-shaped light beam guided from a line light guide is obliquely incident on the surface of the object to be inspected, and a reflected light angle of the light beam is substantially equal to the incident angle. A device that inspects the surface of a test object by receiving and capturing light with a linear CCD camera arranged at an angle and processing the image. 2. The mechanism according to claim 1, wherein the slit-shaped incident light guided from the line light guide moves the surface of the object to be inspected from one side to the other, and the line light guide and the linear CCD camera move in conjunction with each other. And a mechanism for allowing the incident light beam to scan the surface of the object to be inspected, so that the reflected light beam always enters the linear CCD camera. 3. The method according to claim 1, wherein the angle of light at which the light beam emitted from the line light guide impinges on the object to be inspected is 40 to 60 °, respectively, the incident angle and the reflection angle with respect to the normal to the surface of the object to be inspected. The same device. 4. The apparatus according to claim 1, further comprising an adjustment function for adjusting the incident angle of the light source so that the detection sensitivity becomes almost maximum depending on the type of the object to be inspected.