JPH07117494B2 - Cylindrical component surface inspection 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 an inspection method and an apparatus for inspecting the surface of the side surface of a cylindrical part such as a surface scratch on the guide roller surface of a video cassette tape with the simplest structure possible.

[0002]

2. Description of the Related Art Conventionally, there are a method of placing a cylindrical part on a flat pallet, inclining the pallet to roll the part and visually inspecting it, and a method of visually inspecting with an automatic appearance inspection device. Since the visual inspection method requires manual inspection, it may cause unevenness in the judgment, and may cause mistakes in the judgment due to eye fatigue. Is difficult to secure.

An optical method is available as an inspection method in place of the manual operation. This optical inspection of the appearance is to inspect the reflected light from the cylindrical part by image processing, and a still image is required for the image processing.

In order to obtain a still image, it is conceivable to stop the rotation of the cylindrical part at each shooting moment, but it requires accurate gripping so that the position of the part does not shift at the moment of stopping and starting. You will need it. In order to avoid this problem, a camera having a sufficiently high shutter speed has been considered.

However, in the method of repeatedly capturing a partial image in order to obtain a still image, the inspection speed is slowed down, and at the same time, the mechanism for synchronizing the motion of the component and the capturing is not complicated. I can't.

Therefore, as an optical automatic visual inspection using an area sensor, there is an apparatus disclosed in Japanese Patent Publication No. 3-62222. This device collects a developed image of a cylindrical surface of a cylindrical inspection object placed on a roller by an area sensor, thereby inspecting the appearance without stopping the inspection object. Therefore, since the inspection bodies can be continuously supplied and inspected at a constant speed, a large number of inspection bodies can be tested in a short time.

[0007]

However, even if the inspection can be performed while automatically rotating the plurality of cylindrical inspection bodies described above without stopping, the inspection bodies are continuously sent one after another. The structure and the processing structure are complicated.

That is, since the inspection body is continuously conveyed at a constant speed, a large number of conveyance rollers for mounting the inspection body are required. Therefore, the conveyance rollers are connected by a chain or the like, and the driving for conveying is performed by fitting with a gear. Without this, individual inspection bodies cannot be accurately conveyed at a constant speed. In addition, since the gears and chains have to be directly connected to the rollers, there is a problem that blurring is likely to occur during transportation and it takes time for maintenance and inspection. Therefore, the method for inspecting the surface of the inspection object and the method for obtaining the developed image even when the conveyance speed of the inspection object fluctuates because of its simple structure, and the irregular movement of the inspection object during conveyance. Therefore, there is a problem in stable conveyance such that the developed image is not deformed.

[0009]

In order to achieve the above object, the present invention mounts a cylindrical part, which is a part to be inspected, on two rollers that reciprocate while rolling on a flat rail. While the cylindrical part is transported by rotating it approximately once,
A method for inspecting the surface of a cylindrical part, wherein the side surface of the cylindrical part for rotation is imaged by a camera as a development view, and the quality of the side surface of the cylindrical part is optically determined based on the imaging. A supply unit for supplying the columnar parts, a stopper unit for supplying the columnar parts one by one with a plurality of holding rods and a handle bar, and two rollers for moving the columnar parts while rotating them one by one. A forward-backward and backward-moving reciprocating transfer section; an image-pickup section including a camera that takes a development view of the side surface of the cylindrical part for one rotation at a time; and the image-pickup section based on information from the image-pickup section. It is provided with a drive lever for optically deciding the quality of the cylindrical part and carrying it out, and a carry-out part composed of a part dropping bar, and when the carrying part moves backward and acts on the stopper part, one by one by the holding bar. The cylindrical part of the roller The cylindrical part is imaged by the image pickup part while the conveying part is moving forward, the conveying part is further moving forward, and acts on the drive lever to move the cylindrical part by the part drop bar to the roller. It is a cylindrical part surface inspection device characterized in that it is configured to be dropped from above onto an appropriate place.

[0010]

Operation: The surface inspection method for cylindrical parts is performed by placing the cylindrical part 1 on two parallel rollers and rolling the rollers simultaneously on a flat rail to rotate the cylindrical parts one by one. Determining the quality of a cylindrical part by detecting an image of the development for one rotation at the uppermost position of the side surface of the columnar part with a camera at one time to detect defects such as scratches on the surface of the side surface of the cylindrical part. Thereby, the structure can be simplified without requiring a large number of transport rollers.

Further, the cylindrical part surface inspection apparatus supplies a cylindrical part one by one, and a supply part composed of a stopper part having a handle bar which also functions as a stopper and a plurality of holding bars, and a cylindrical part. From the image pickup unit, and a conveyance unit including two rollers that move while rotating each one, an image pickup unit including a camera that takes a development view of the side surface of the cylindrical part for one rotation at a time, With a sorting unit that sorts out the quality of the cylindrical parts based on the information and carries them out to an appropriate place, the handle bar moves in a circular motion by hitting the upper corner of the transport unit,
1 by a holding rod that makes a circular motion according to the movement of the handle bar
Place the columnar parts on the roller one by one, and hit the upper corner on the opposite side of the transport section to move in a circular motion according to the drive lever that moves in a circular motion. By adopting a configuration in which it is dropped at an appropriate location, the inspection body can be accurately transported, and
It is possible to obtain an accurate development view.

[0012]

The present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the surface inspection method of the cylindrical part 1 is performed by placing the cylindrical part 1 on two rollers 2 and 3 and rolling the rollers 2 and 3 on a flat rail 4 at the same time. Are rotated and moved one by one, and a development view for one rotation at the position of the uppermost portion 1a on the side surface of the cylindrical component 1 is captured by the camera 5 at one time and is provided on the surface of the side surface of the cylindrical component 1. Defects such as scratches are detected to determine pass / fail.

As shown in FIGS. 2 and 3, the surface inspection apparatus for a cylindrical part equipped with this surface inspection method for a cylindrical part is a handle bar that supplies one by one the cylindrical parts 1 and also serves as a stopper. 6 and two holding rods 7a and 7b, and a supply portion 9 including a stopper portion 8 and a cylindrical component 1.
Two rollers 2, 3 that move while rotating one by one
And a camera 10 for capturing a development view of the side surface of the cylindrical part 1 for one rotation at a time.
And the cylindrical part 1 based on the information from the image pickup section 12.
And a carry-out section 13 for selecting whether the product is good or bad and carrying it out to an appropriate place.

The supply plate 9 has a storage plate 9 having an inclined surface so that the cylindrical part 1 naturally rolls downward when the cylindrical part 1 is placed thereon.
a is provided, and the stopper portion 8 is provided on the lower end surface of the storage plate 9a.
Is provided.

The stopper portion 8 forms a disk and is configured to rotate left and right by a fixed distance with its center point as a fulcrum, and two holding rods are provided at one point on the circumference at a fixed distance from this fulcrum. 7a and 7b are fixed, and further the handle bar 6 is fixed to a point on the circumference which is an intermediate position between the holding bars 7a and 7b and which is farther from the fulcrum than the circumference of the holding bars 7a and 7b. It is a structure.

By pushing the handle bar 6 of the stopper portion 8 configured as described above to the right, the stopper portion 8 rotates one direction to the left so that one cylindrical component 1 is placed on the holding rods 7a and 7b. The two rollers 2 of the transport section 10,
3, the columnar component 1 is supplied on top of this, and the holding rod 7b stops the other columnar components waiting in order for inspection by the storage plate 9a.

Then, the two rollers 2 of the transport section 10,
When the cylindrical part 1 is conveyed to the left (advancing direction) with respect to the drawing by riding on 3, the stopper portion 8 (not shown) is urged by a spring to always rotate counterclockwise and the conveying portion 10 is rotated. The cylindrical component 1 to be inspected next is stopped while being supported by the two holding rods 7a and 7b while rotating to the right according to the conveying speed.

A means for supplying the columnar parts 1 one by one onto the two rollers 2 and 3 of the conveying section 10 by rotating the disk of the stopper section 8 described above with reference to FIGS. 3 to 6. Will be described in detail.

First, as shown in FIG. 3, when the carrying section 10 moves backward along the rail 4 toward the stopper section 8,
The handle bar 6 contacts the upper corner of the transport unit 10.

When the transport unit 10 continues to retreat in the abutting state, as shown in FIG. 4, the holding rod also moves to the left in circular motion in accordance with the movement of the handle rod 6 on the circumference of the cylinder. The part 1 is supported by being supported just from the bottom surface.

Next, when the transport unit 10 continues to move backward, as shown in FIG.
As shown in (1), the holding rod 7b is inserted between the columnar part 1 (part shown by hatching) and the next columnar part 1 to stop the next columnar part 1 and to inspect the columnar part 1 ( Prepare to drop the parts indicated by the diagonal lines.

Further, when the transport unit 10 continues to move backward, FIG.
As shown in FIG. 7, the holding rod 7a supports the columnar component 1 (the component shown by diagonal lines) at a position on the substantially right side from directly below, and the holding rod 7b comes from the storage plate 9a in the vicinity of the radial position of the cylindrical component 1. And pushes it to the left, it falls to the left with the support rod 7a as a fulcrum. This drop position is located substantially above the two rollers 2 and 3 of the transport unit 10. Therefore, one cylindrical component 1 can be placed on the two rollers 2 and 3. At the same time, the conveyance unit 10 is detected by a sensor that detects the supply position where the cylindrical part 1 is dropped onto the two rollers 2 and 3.
Will stop.

Here, the transport unit 10 places the cylindrical component 1 on the two rollers 2 and 3 and rotates it between the supply position of the supply unit and the discharge position provided in the discharge unit 13. The structure is such that each sensor detects the position and reciprocates. That is, as shown in FIG.
It is carried out through a connector 14b provided at one end of the rack 14 having a gear 14a at a lower position and also serving as a shock absorber. The rack 14 is supported by two supporting gears 15 and has a gear 16a fitted to the gear 14a at a central position thereof.
The pinion 16 having the
Although not shown, the motor is connected.

Since the rack 14 moves to the left and right due to the conduction of the gear 16a, it is possible to avoid transmission of vibrations or the like generated directly from the motor or the like to the transfer section 10 connected to the rack 14. Therefore, the movement of the transport unit 10 has a structure in which vibration or the like from the drive source is not transmitted.

Further, since the structure of the transfer unit 10 is separated from the drive source and moved so as to sandwich the rail 4, the transfer of the columnar component 1 while suppressing the shake and vibration during the transfer is performed. It is possible. That is, the transport unit 10
Two rollers 2 and 3 are placed on the upper side of the rail 4, and two rollers 17 and 18 are provided on the lower side at positions spaced apart from the upper rollers 2 and 3 to support them.

The image pickup section 12 is a camera for unfolding and picking up an image of one rotation of the side surface of the cylindrical part 1 which rolls on the two rollers 2, 3 of the conveying section 10, and a camera (not shown). It has a control unit for decoding the input signal of. That is, at the uppermost part of the cylindrical part 1, since the conveying speed of the cylindrical part 1 and the moving speed of the surface due to rotation are equal in size and opposite in direction, each point on the surface passes near this point. Instantly forms a quiescent state.

Therefore, by selecting an illuminating method for illuminating the cylindrical part 1 so that only the image of the uppermost part of the cylindrical part 1 and its vicinity is recorded, a narrow width stationary is achieved irrespective of the fluctuation of the conveying speed. A developed view similar to the case where the images are connected without any gap is obtained.

When the transport unit 10 advances and passes the position of the image pickup unit 12, the image pickup unit 1 determines whether the cylindrical component 1 is good or bad.
This is a structure in which the selected drop position of the cylindrical part can be determined based on the signal from 2 and dropped to an appropriate place by the part drop bar 13e in the carry-out section 13.

Here, the carry-out section 13 is composed of a disk 13a which rotates a circle at a fixed distance with a center point as a fulcrum, and a small disk 13c which is at least smaller than the disk 13a and is connected by a timing belt 13b. Is provided with a drive lever 13d protruding vertically, and a small disc 13c
In the same manner, the component dropping bar 13e protruding vertically is provided in the structure. Since the timing belt 13b is conductive, both rotational deviations can be prevented.

An embodiment in which the cylindrical component 1 is dropped to a position appropriately selected by the drive lever 13d and the component drop bar 13e described above will be described in detail with reference to FIGS. 7 and 8 to 11.

First, the transport unit 10 advances toward the unloading unit 13 in order to drop the cylindrical component 1 to an appropriate position based on a signal from the image pickup unit 12 and carry it out. Then,
As shown in FIG. 8, the upper left corner of the transport unit 10 and the drive lever 13d are in contact with each other. At this time, the component drop bar 13e is located just above the columnar component 1.

When the transport unit 10 continues to move forward along the rail 4, as shown in FIG. 9, the disk 13a is moved to the right by pushing the drive lever 13d, which is in contact with the upper left portion of the transport unit 10, to the left. Rotate. As the disk 13a rotates to the right, it is transmitted to the small disk 13c connected by the timing belt 13b and rotates to the right by a distance corresponding to the right-turned distance of the disk 13a, so that the component drop bar 13e is just rotated. It is in a state of hitting the right side surface of the cylindrical part 1 which is on the two rollers 2 and 3 of the transport section 10.

In this state, when the transport section 10 further advances, as shown in FIGS. 10 and 11, the drive lever 13d is moved.
Is pushed further to the left, the parts drop bar 13e
Rotates in the right direction to rotate the cylindrical part 1 into two rollers 2,
It can be dropped from above 3 toward the direction in which the transport unit 10 is advancing. The reason why it can be dropped toward the traveling direction of the transport unit 10 is that the small disk 13c has a smaller diameter than the disk 13a and is connected by the timing belt 13b to rotate integrally. That is, since the small disk 13c rotates in proportion to the diameter of the disk 13a, the small disk 13c rotates faster than the disk 13a that rotates corresponding to the traveling speed of the transport unit 10.
Since the rotating parts rotate, the columnar parts 1 can be dropped on the traveling direction side of the transport section 10.

In this manner, as shown in FIGS. 7 and 11, it is possible to carry out the transfer unit 10 to the outside of the transfer unit 10 by the component drop bar 13e that moves a distance longer than the moving distance of the drive lever 13d. It is a structure that can be automatically created by movement.

At this time, if the cylindrical part 1 is a non-defective product, it is stopped by a signal from a sensor (not shown) that has detected the carry-out position, and if it is a defective product, a fixed distance after detection by the sensor that has detected the carry-out position. Retreat and stop. Therefore, the good columnar parts 1 are carried out to the outside of the partition plate 19, and the defective products are carried to the inside of the partition plate 19.

[0036]

According to the method for inspecting the surface of a cylindrical part of the present invention described above, one cylindrical part is placed by placing the cylindrical part on two parallel rollers and rolling the rollers simultaneously on a flat rail. While rotating each one, the development view for one rotation at the uppermost position of the side surface of the cylindrical part is imaged by the camera to detect defects such as scratches on the surface of the side surface of the cylindrical part to judge the pass / fail. By doing so, even with an extremely simple structure, it is possible to reliably obtain a development view for one rotation of the cylindrical side surface one by one, and automatically perform the pass / fail selection.

Further, the cylindrical part surface inspection apparatus supplies a cylindrical part, and a supply part composed of a stopper part for supplying the cylindrical parts one by one from a plurality of holding rods also serving as stoppers and handle bars. A transport unit having two rollers for moving the cylindrical parts while rotating them one by one, and an image pickup unit having a camera for taking one rotation development view of the side surface of the cylindrical parts, Equipped with a carry-out section that selects the quality of the cylindrical parts based on the information from the imaging section and carries them out to an appropriate place.The handle bar hits the upper corner of the transfer section and rotates in a circular motion, depending on the movement of the handle bar. A columnar component is placed on the roller one by one by a holding rod that moves on the circumference, and a component that moves on the circumference according to a drive lever that moves on the circumference by hitting the upper corner on the opposite side of the transport unit. Columnar part with drop bar Since it is possible to simplify the structure of the roller that conveys the cylindrical part by dropping the roller from above the roller to an appropriate place, it is possible to suppress the blurring and vibration due to the movement and improve the accuracy of image capturing by the camera. Moreover, since the structure is extremely simple, the number of parts can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view in which a cylindrical part is placed on two rollers and moved while rotating.

FIG. 2 is a cross-sectional view of a cylindrical part surface inspection apparatus according to the present invention when a cylindrical part is placed on two rollers of a conveying section.

FIG. 3 is a schematic cross-sectional view showing a state in which the transport unit has moved toward the supply unit and is in contact with a handle bar of the supply unit at an upper corner of the transport unit according to the present invention.

FIG. 4 is a view showing a state in which a carrying part according to the present invention advances toward a supply part and contacts a handle bar of the supply part at an upper corner of the carrying part to place a cylindrical part on a holding bar. 3 is a schematic cross-sectional view.

FIG. 5 is a view showing that the transport unit according to the present invention advances toward the supply unit and contacts the handle bar of the supply unit at the upper corner of the transport unit to mount the cylindrical part on the holding rod; 3 is a schematic cross-sectional view showing a state of being separated from a cylindrical part.

FIG. 6 is a view showing that the conveying unit according to the present invention advances toward the supplying unit and contacts one of the upper corners of the conveying unit with the handle bar of the supplying unit to move the columnar component onto the holding bar; 6 is a schematic cross-sectional view showing a state in which the cylindrical part is separated and dropped onto two rolls.

FIG. 7 shows a cylindrical part inspection device according to the present invention,
FIG. 7 is an overall cross-sectional view showing a state where a transport unit carries out a cylindrical part after inspection.

FIG. 8 is a diagram illustrating a configuration in which the conveying unit advances toward the unloading unit and unloads the driving lever of the unloading unit in order to unload the cylindrical component, which is placed on the carrying unit according to the present invention and moving while rotating, to the outside of the carrying unit. FIG. 3 is a schematic cross-sectional view showing a state in which it is in contact with one upper left corner of the section.

FIG. 9 is a diagram illustrating a configuration in which the transport unit advances toward the unloading unit and unloads the drive lever of the unloading unit in order to unload the columnar component that is placed on the transporting unit and moving while rotating, to the outside of the transport unit. 2 is a schematic cross-sectional view showing a state where a component drop bar hits a cylindrical component while advancing while contacting an upper left corner of the part.

FIG. 10 is a diagram illustrating a configuration in which, in order to carry out a columnar component which is placed on the carrying unit and is rotating and moving, to the outside of the carrying unit, the carrying unit advances in the carrying-out direction toward the driving lever of the carrying-out unit. FIG. 7 is a schematic cross-sectional view showing a state in which the part dropping bar hits a columnar part and is carried out from the two rollers by advancing while contacting one left upper corner of the part. FIG.

FIG. 11 is a diagram illustrating a configuration in which the transport unit advances toward the unloading unit and unloads the drive lever of the unloading unit in order to unload the cylindrical component that is placed on the transporting unit and rotating and moving to the outside of the transporting unit according to the present invention. 7 is a schematic cross-sectional view showing a state in which the part dropping bar has come into contact with the upper left corner of the part and the part dropping bar hits the columnar part to finish carrying out the columnar part from the two rollers.

[Explanation of symbols]

 1 Cylindrical parts 2 Roller 3 Roller 4 Rail 5 Camera 6 Handle bar 7a Holding rod 7b Holding rod 8 Stopper part 9 Supply part 9a Storage plate 10 Conveying part 12 Imaging part 13 Unloading part 13a Disc 13b Timing belt 13c Small disc 13d Drive lever 13e Parts dropping bar 14 Rack 14a Gear 15 Support gear 16 Pinion 17 Roller 18 Roller 19 Partition plate

Continuation of the front page (56) Reference JP 62-39746 (JP, A) JP 62-39745 (JP, A) JP 57-3033 (JP, A) JP 54-124783 (JP , A)

Claims (2)

[Claims] 1. A cylindrical part, which is a part to be inspected, is placed on two rollers that reciprocate while rolling on a flat rail. A method for inspecting a surface of a cylindrical part, wherein a side surface of the cylindrical part for one rotation is taken as a development view by a camera, and the quality of the side surface of the cylindrical part is optically discriminated based on the imaging. 2. A supply part for supplying a cylindrical part, a stopper part for supplying the cylindrical part one by one with a plurality of holding rods and a handle bar, and a moving part while rotating the cylindrical part one by one. A forward and backward reciprocating transporting unit having two rollers, an image pickup unit having a camera for taking a single rotation development view of the side surface of the cylindrical part, and an image pickup unit from the image pickup unit. A drive lever for optically determining the quality of the columnar component based on the information of ## EQU1 ## and unloading the component, and a unloading part composed of a component drop bar, and when the transport part retracts and acts on the stopper part, The columnar parts are placed one by one on the rollers by holding rods, the cylindrical parts are imaged by the imaging unit while the transport unit is moving forward, and the transport unit is further moved forward to move the drive lever. Acting on the parts by the dropping bar An apparatus for inspecting a surface of a cylindrical part, characterized in that the cylindrical part is dropped from an appropriate position on the roller.