JP2005214751A - Inspection device of screw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inspect a large quantity of screws accurately and efficiently, by transferring the screws accurately at constant pitch. <P>SOLUTION: This inspection device of the screw is equipped with a disk 2 provided with guide parts 3 for transferring the screws in the state where each screw head is caught on the upper surface, at prescribed intervals on an arc-shaped peripheral edge part, a supply mechanism 4 for supplying the screws 1 to the guide parts 3, a transfer guide 5 disposed on the outside of the disk 2, and an inspection mechanism 6 for inspecting the screw transferred by the disk 2. The inspection mechanism 6 is equipped with a light source 7 for irradiating light toward the screw 1, a camera 8 for receiving the light irradiated from the light source 7 and converting the contour of the screw 1 into a silhouette image signal, and an operation inspector 9 for operating the image signal outputted from the camera 8 and inspecting the screw 1 by performing image processing. The disk 2 is provided with a through hole 10 inside and the light source 7 is provided inside the through hole 10, and the camera 8 is disposed outside the disk 2. The inspection device inspects the screw 1 by performing operation processing of the image signal outputted from the camera 8 by the operation inspector 9. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an inspection apparatus that receives light by a video camera and inspects a screw.

  The present inventor has developed a device for detecting a screw using light (see Patent Document 1). This screw inspection device inspects the thread, length, and plating with three sets of optical sensors. Since this inspection apparatus performs inspection by providing a dedicated optical sensor for the inspection item of the screw, it is necessary to use a large number of optical sensors when the number of inspection items increases. For this reason, if the inspection item differs depending on the user, it is necessary to use a dedicated mechanism, and there is a drawback that it takes time to change the inspection item. In addition, there is a disadvantage that a screw having a part of the thread missing cannot be selected as a defective screw. It irradiates light to a specific part of the screw thread, and detects the presence or absence of the screw by its reflected light, so if there is a defect or damage in the thread other than the part that irradiates the light, it can not be detected It is.

  This defect can be eliminated by an inspection apparatus using a CCD camera. This inspection apparatus inspects screws by performing arithmetic processing on a video signal output from a CCD camera. A screw inspection device having this structure has been developed (see Patent Document 2). The inspection apparatus described in this publication uses a linear feeder to feed a screw that has been automatically fed into a parts feeder by a feeding device such as a hopper, and then sends it to an inspection unit using a linear feeder. The processing device inspects the external shape of the screw, etc., and discriminates good products from different types of screws and defective screws. For those that cannot be suspended, a V-groove chute is used.

Japanese Utility Model Publication No. 62-40711 JP-A-6-167323

  This inspection apparatus has the advantage that screws of various sizes and lengths can be inspected because the screws are suspended and aligned and sent to the inspection section by a linear feeder and the CCD camera and image processing apparatus inspect the screws. However, the linear feeder cannot transfer screws at a precise and constant pitch. Screws that are transferred through the linear feeder may be transferred with no gaps between them, or the interval between the screws may be very wide. For this reason, there is a drawback that the CCD camera cannot always image the screw at an accurate position. For this reason, since the screw position is calculated and detected from the video signal output from the CCD camera, the calculation process takes time. This is synergistic with the fact that the screws cannot be aligned to a constant pitch and transferred to the linear feeder, thereby reducing the number of screws that can be inspected per unit time. That is, it becomes difficult to accurately inspect a large number of screws efficiently in a short time.

  The inspection apparatus using the optical sensor previously developed by the present inventor can transfer screws at a constant pitch with a disk. However, in the inspection apparatus having a structure in which the screw is transferred by this mechanism and the screw is picked up by the CCD camera, the light source and the CCD camera are arranged on both sides of the disk. The distance between the light source and the screw or the distance between the camera and the screw becomes long, which makes it difficult to accurately inspect the screw. A screw is placed between the light source and the camera, and the camera is used to image and inspect the light silhouette of the light source beyond the screw. If the distance between the screw, the light source, and the camera is not optimal, the screw outline This makes it impossible to capture images clearly and decreases the inspection accuracy.

  The present invention has been developed for the purpose of solving this drawback. An important object of the present invention is to accurately and efficiently inspect a large number of screws by accurately transferring screws at a constant pitch and allowing a camera to image the screws in synchronization with the screw transfer. Is to provide.

  The screw inspection apparatus of the present invention is a disk 2 in which a guide portion 3 is provided at a predetermined interval in a state where the shaft portion 1B of the screw 1 is inserted and the screw head 1A is hooked on the upper surface at an arcuate outer peripheral edge portion. And a supply mechanism 4 for supplying the screw 1 to the guide part 3 of the disk 2, and the outer side of the disk 2 so that the screw 1 supplied to the guide part 3 by the supply mechanism 4 is held and transferred to the guide part 3. And an inspection mechanism 6 for inspecting the screw 1 transferred by the disk 2. The inspection mechanism 6 includes a light source 7 that emits light toward the screw 1, a camera 8 that receives the light emitted from the light source 7 and converts the light into a silhouette video signal indicating the outline of the screw 1, An arithmetic tester 9 is provided that calculates the video signal to be output and performs image processing on the screw 1 for inspection.

  Furthermore, in the screw inspection apparatus according to claim 1 of the present invention, the through hole 10 is provided inside the disk 2, and the light source 7 is disposed inside the through hole 10. The light source 7 is disposed so as to irradiate light from the inside of the disk 2 toward the outer periphery and irradiate the light toward the screw 1 of the guide portion 3. The camera 8 is disposed outside the disk 2, receives light emitted from the light source 7 toward the screw 1 by the camera 8, images the screw 1 as a silhouette image, and outputs a video signal. The inspection device inspects the screw 1 by performing arithmetic processing on the video signal output from the camera 8 by the arithmetic inspection device 9.

  Furthermore, in the screw inspection apparatus according to claim 2 of the present invention, the through hole 10 is provided inside the disk 2, the camera 8 is disposed inside the through hole 10, and the light source 7 is disposed outside the disk 2. It is arranged. The light source 7 is disposed so as to irradiate light from the outer side of the disk 2 toward the inner side and irradiate the light toward the screw 1 of the guide portion 3. The light emitted from the light source 7 toward the screw 1 is received by the camera 8, and the camera 8 images the screw 1 as a silhouette image and outputs a video signal. The inspection device inspects the screw 1 by performing arithmetic processing on the video signal output from the camera 8 by the arithmetic inspection device 9.

  In the screw inspection apparatus of the present invention, the camera 8 can receive an image of the screw 1 in synchronization with a timing signal output from the position sensor 18 that detects the position of the guide portion 3 of the disk 2.

  Furthermore, the screw inspection apparatus of the present invention uses a light source 7 as a surface light source to simultaneously irradiate a plurality of screws 1 with light, and a camera 8 receives the contours of the plurality of screws 1 as silhouette images, and performs arithmetic inspection. The device 9 can inspect a plurality of screws 1 simultaneously.

  Furthermore, in the screw inspection apparatus of the present invention, the light source 7 includes an upper light source 7A that irradiates light to the head portion of the screw 1 and a lower light source 7B that irradiates light to the shaft portion 1B of the screw 1. The upper light source 7A can be further away from the screw 1 than the lower light source 7B, and can irradiate the screw 1 with light.

  Furthermore, in the screw inspection apparatus of the present invention, the light source 7 can be continuously lit to irradiate the screw 1 with light, or the light can be irradiated in synchronization with the transfer of the screw 1.

  Furthermore, in the screw inspection apparatus of the present invention, the driving roller 11 for rotating the disk 2 can be disposed in the through hole 10 of the disk 2. Furthermore, the screw inspection apparatus of the present invention can be disposed outside the drive roller 11 so that the disk 2 can be attached and detached.

  The inspection apparatus of the present invention has a feature that a large number of screws can be inspected accurately and efficiently. This is because the inspection apparatus according to the present invention can accurately transfer a screw at a fixed pitch by inserting a screw into the guide portion of the disk, so that the camera can take an image of the screw in synchronism with the transfer of the screw. Also, since the guide part of the disk can move the screws at regular intervals, the screws are not continuous or partly overlap when the camera takes an image. The ability to accurately detect the screw as a silhouette is also effective in accurately inspecting the screw.

  Furthermore, since the inspection apparatus of the present invention has a through hole in the disk and the light source is disposed here, the distance between the light source, the screw and the camera can be adjusted while the screw is transferred at a constant pitch. It is possible to achieve an ideal distance that allows a beautiful image of the screw silhouette. For this reason, the camera can accurately inspect the screw by accurately imaging the silhouette of each screw. In particular, as in the inspection apparatus according to claim 5, the light source is separated into an upper light source and a lower light source, and each light source is disposed at a more ideal position, so that the screw can be inspected more accurately. . Further, as described in claim 2, the distance between the camera, the screw, and the light source is arranged at an ideal position by a structure in which the camera is arranged in the through hole of the disk and the light source is arranged outside the disk. Thus, the screw can be detected accurately.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a screw inspection device for embodying the technical idea of the present invention, and the present invention does not specify the inspection device as follows.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The screw inspection apparatus shown in FIG. 1 is a disk in which guide portions 3 are provided at regular intervals in a state in which a shaft portion 1B of a screw 1 is inserted and a screw head 1A is hooked on an upper surface at an arcuate outer peripheral edge portion. 2, a supply mechanism 4 for supplying the screw 1 to the guide part 3 of the disk 2, and the screw 1 supplied to the guide part 3 by the supply mechanism 4 so as to be held and transferred to the guide part 3. A transfer guide 5 disposed outside and an inspection mechanism 6 for inspecting the screw 1 transferred by the disk 2 are provided.

  As shown in the plan view of FIG. 1, the disk 2 is provided with a through hole 10 on the inner side, and has a circular ring shape as a whole. In the illustrated disk 2, the inner periphery and the outer periphery are circular, guide portions 3 are provided on the outer periphery at regular intervals, and the inner periphery is driven by a driving roller 11 to be rotated. The guide portion 3 has a U-groove shape so that the screw 1 can be guided. The guide portion may be any shape that can guide the screw, for example, a triangle.

  The transfer guide 5 is disposed along the outer periphery of the disk 2 and closes the opening edge of the guide part 3 of the disk 2 to prevent the screw 1 transferred by the disk 2 from dropping from the guide part 3. doing. The transfer guide 5 may be in contact with the outer peripheral edge of the disk 2, but is preferably in a non-contact state where the disk 2 approaches but does not contact in order to rotate the disk 2 more smoothly. The transfer guide 5 is a partial area outside the disk 2, and is disposed only in an area until the screw 1 supplied by the supply mechanism 4 is inspected by the inspection mechanism 6 and then discharged.

  The screw 1 is supplied from the supply guide 12 to the guide portion 3 of the disk 2. The supply guide 12 in FIGS. 2 and 3 is arranged in a straight line so that the two side walls 13 are narrower than the screw head 1A and wider than the shaft portion 1B so that the screws 1 can be transferred side by side. The screws 1 are transferred side by side by vibration. The supply guide 12 is connected at its tip between the tip of the transfer guide 5 and the disk 2. The linear supply guide 12 is disposed at an angle of, for example, 45 to 60 degrees with respect to the tangential direction of the disk 2 so that the screw 1 to be fed can be smoothly fed into the guide portion 3. Further, as shown in the figure, the air blown from the air nozzle 14 is transferred to the guide portion 3 of the disk 2.

  The air nozzle 14 pushes the screw 1 into the guide part 3 and injects air in a direction in which the screw 1 is transferred toward the guide part 3. The air nozzle 14 blows air to the screw 1 positioned at the foremost end of the supply guide 12 to accelerate the air, and moves the screw 1 at the front end away from the next screw 1 sent to the air. Press against the outer periphery of the disk 2 with a flow. When the disk 2 rotates and the guide part 3 comes in front of the supply guide 12, the most advanced screw 1 is pressed by the air flow and pushed into the guide part 3.

  2 and 3 are provided with two air nozzles 14. The lower air nozzle 14 blows air to the shaft portion 1B, the upper air nozzle 14 blows air toward the screw head 1A, and presses the head portion and the shaft portion of the screw 1 with the upper and lower air nozzles 14. . The air nozzle 14 is connected to a compressor that is an air source 16 via an on-off valve 15 that controls the blowing of air.

  The inspection mechanism 6 includes a light source 7 that emits light toward the screw 1, a camera 8 that receives the light emitted from the light source 7 and converts the light into a silhouette video signal indicating the outline of the screw 1, A calculation tester 9 is provided for calculating the video signal to be output and performing image processing on the screw 1.

  The light source 7 shown in FIGS. 1 and 4 is a surface light source. The surface light source irradiates the front surface with uniform light from the surface. A light source 7 as a surface light source irradiates a plurality of screws 1 with light simultaneously. Furthermore, the light source 7 of FIG. 4 includes an upper light source 7A that irradiates light to the head portion of the screw 1 and a lower light source 7B that irradiates light to the shaft portion 1B of the screw 1. The upper light source 7A irradiates the screw 1 with light farther from the screw 1 than the lower light source 7B. As described above, the light source 7 is divided into the upper light source 7A and the lower light source 7B, and the upper light source 7A irradiates light to the screw head 1A, and the lower light source 7B irradiates light to the shaft portion 1B of the screw 1. The inspection accuracy of 1 can be increased. This is because the camera 8 can capture both the screw head 1A and the shaft portion 1B having different outer diameters as images with clear outlines so that the outer peripheral edge of the silhouette cannot be blurred. As shown in FIG. 5, when imaging the outline of the screw 1 with a silhouette, if the distance from the light source 7 to the screw 1 is too close, bleeding occurs on the outer peripheral edge of the silhouette. In order to avoid this problem, if the light source 7 is separated from the screw 1, the contrast between the silhouette of the screw 1 and the light source 7 is lowered. The structure in which the upper light source 7A irradiates light to the screw 1 away from the screw 1 than the lower light source 7B can capture both the silhouette of the screw head 1A and the shaft portion 1B as a clear image. The screw head 1A having a large outer diameter can be smeared when the light source 7 is approached. The contrast of the shaft portion 1B having a small outer diameter decreases when the light source 7 is separated. The blur and contrast vary with the distance between the screw 1 and the light source 7. The screw head 1A having a large outer diameter is likely to be blurred when the light source 7 is approached. When the light source 7 is separated from the screw 1 so as to be optimal for the screw head 1A, the contrast of the shaft portion 1B decreases. The light source 7 that divides the upper light source 7A and the lower light source 7B is separated from the screw head 1A so that the upper light source 7A cannot be smeared, and the shaft portion 1B of the screw 1 approaches to increase the contrast. 1 can be imaged by the camera 8 as a clear silhouette. However, the light source does not necessarily need to be divided into an upper light source and a lower light source, and both the screw head and the shaft portion can be irradiated with light as a coplanar surface light source.

  The surface light source irradiates the screw 1 with white light, or irradiates the screw 1 with light such as red, blue, and green. As the light source 7, a light emitting diode, a cold cathode tube, and a light bulb can be used. The surface light source may have a structure used for a liquid crystal backlight or the like. Since the surface light source can uniformly irradiate the entire screw 1, the inspection accuracy of the screw 1 can be increased. However, in the inspection apparatus of the present invention, the light source is not necessarily a surface light source, and a point light source can also be used.

  As shown in FIG. 1, the disk 2 has a through hole 10 on the inner side. A light source 7 is disposed inside a through hole 10 provided in the disk 2. The light source 7 is disposed so as to irradiate light from the inside of the disk 2 toward the outer periphery and irradiate the light toward the screw 1 of the guide portion 3. The camera 8 is disposed outside the disk 2, receives light emitted from the light source 7 toward the screw 1, images the screw 1 as a silhouette image, and outputs a video signal.

  The disk 2 is rotated by a driving roller 11 disposed in the through hole 10. As shown in the cross-sectional view of FIG. 6, the driving roller 11 elastically sandwiches the disk 2 up and down and rotates the disk 2. In the apparatus of FIG. 1, three sets of driving rollers 11 are disposed in the through hole 10. The plurality of driving rollers 11 drive any one to rotate the disk 2. The drive roller 11 to be driven is connected to the motor 17 and rotated by the motor 17 as shown in FIG.

  The disk 2 is disposed outside the drive roller 11 so as to be removable. In order to detach the disk 2, the drive roller 11 is elastically moved outward by an elastic body (not shown) such as a spring. In this structure, the driving roller 11 is moved inward to exchange the disk 2.

  In the apparatus shown in the figure, the light source 7 is disposed in the through hole 10 of the disk 2 and the camera 8 is disposed outside the disk 2, but the inspection apparatus of the present invention has the camera disposed in the through hole of the disk. And a light source can also be arrange | positioned on the outer side of a disk. This inspection apparatus is arranged such that the light source emits light from the outside to the inside of the disk and irradiates the light toward the screw of the guide portion. Light emitted from the light source toward the screw is received by the camera, and the camera images the screw as a silhouette image and outputs a video signal. The video signal output from the camera is processed by an arithmetic tester to inspect the screw.

  As shown in FIG. 5, the camera 8 receives the outlines of the plurality of screws 1 as silhouette images, and outputs the image signals of the silhouettes of the plurality of screws 1 to the arithmetic tester 9. For example, as shown in FIG. 5, the camera 8 images the three screws 1 at the same time and outputs the video signal to the arithmetic tester 9. The arithmetic tester 9 calculates the input video signal and simultaneously inspects the three screws 1. As described above, the apparatus that images a plurality of screws 1 together and performs arithmetic processing by the arithmetic tester 9 can reduce the time for inspecting one screw 1 and inspect a large number of screws 1 in a short time. . However, the camera can image two or four or more screws together and output a video signal to the arithmetic tester. Also, the camera can image one screw and output the video signal to the arithmetic tester. Can also be output.

  The camera 8 images the screw 1 in synchronization with a timing signal output from a position sensor 18 that detects the position of the guide portion 3 of the disk 2. In this structure, since the camera 8 images the screw 1 in synchronization with the rotational position of the disk 2, the camera 8 can always image the screw 1 at a fixed position. The position sensor 18 detects a concave portion and a convex portion of the guide portion 3 with light and outputs a timing signal, or detects a convex portion between the guide portions 3 with light and outputs a timing signal. The unit 3 is detected by light and a timing signal is output. The position sensor can also detect a magnetic signal indicating a position provided on the disk and output a timing signal.

  The light source 7 blinks in synchronization with the timing signal output from the position sensor 18 or is continuously lit. The light source 7 blinking in synchronization with the timing signal of the position sensor 18 is turned on when the camera 8 captures the screw 1 and is turned off when the camera 8 does not capture the screw 1. A device that turns on the light source 7 in synchronization with the timing at which the camera 8 images the screw 1 can shorten the lighting time of the light source 7 and can clearly image the moving screw 1.

  The arithmetic inspector 9 determines from the video signal input from the camera 8 the total length of the screw 1, the length under the neck, the height of the screw head 1A, the outer diameter of the screw head 1A, the crest diameter and the trough diameter of the shaft portion 1B. The lead angle of the screw 1, the tip sharpness of the shaft portion 1B, and the like are calculated. From the calculated result, if the screw 1 to be inspected is a standard screw, it is determined as a normal screw, and if it is a nonstandard screw, it is determined as a nonstandard screw.

  The nonstandard screw is separated from the normal screw by the removing means 19. The removing means 19 removes the nonstandard screw detected by the arithmetic tester 9 when it reaches the removal position. The removal sensor 20, the removal nozzle 21, and the air flow injected from the removal nozzle 21 And an on-off valve 22 which is a control member of the removal nozzle 21 for controlling the above.

  When transferring the screws 1 side by side, it is convenient to once remove the non-standard screws by a predetermined distance rather than immediately removing them at the detection position. In order to realize this, it is detected how many screws 1 exist at the position where the quality of the screw 1 is detected and the position where the nonstandard screw is removed, and the screw 1 which passes through the removal position is determined. What is necessary is just to decide whether to remove.

  The removal sensor 20 detects that a nonstandard screw has come to a fixed position. When a nonstandard screw that needs to be removed passes in front of the removal nozzle 21, the removal sensor 20 outputs this fact to the arithmetic and inspection device 9. The arithmetic tester 9 controls an on-off valve 22 connected between the removal nozzle 21 and the air source 16. The arithmetic tester 9 opens the on-off valve 22 so as to inject air toward the nonstandard screw, and removes the nonstandard screw with an air flow.

  As shown in FIG. 7, the removal sensor 20 includes a light receiving body 24 that receives the light beam emitted from the light source 23, and the light from the light source 23 is blocked by the screw head 1 </ b> A, so that the screw 1 has come to a fixed position. Is detected. Accordingly, the light source 23 irradiates the light beam toward the radial direction of the disk 2 and toward the screw head 1A, and the photoreceptor 24 is between the screw head and the light source 23 in front of the light beam emitted from the light source 23. It is disposed at a position sandwiching 1A. In the removal sensor 20 of this structure, the screw head 1A comes between the light source 23 and the light receiving body 24, the light receiving body 24 detects that the incident light of the light receiving rest 24 has decreased, and the screw 1 comes to a fixed position. Detect that.

  The output signal of the light reception rest 24 is sent to the arithmetic tester 9. When the screw 1 is a nonstandard screw, the on-off valve 22 is opened and air is ejected from the removal nozzle 21. When the screw 1 is a non-defective screw, the on-off valve 22 is not opened, that is, the removal nozzle 21 does not blow out air. 2 is sent to the next process by the guide 3.

  When air is ejected from the removal nozzle 21, the nonstandard screw is immediately blown off from the guide portion 3 of the disk 2 and fed into the removal guide 25 as shown in FIGS. 7 and 8. When air is not blown from the removal nozzle 21, the normal screw passes through the front of the removal nozzle 21 and then strikes the take-out arm 26 disposed in the passage of the screw 1 so as to incline toward the traveling direction. It is sent to the guide 27.

  By the way, as shown in FIG. 7, generally, the removal sensor 20 and the removal nozzle 21 are arranged somewhat apart from each other. Therefore, the on-off valve 22 that controls the air injection of the removal nozzle 21 is opened with a delay for the time that the screw 1 moves from the removal sensor 20 to the front of the removal nozzle 21 and is pulsed for the time that the single screw 1 is blown off. After the air is blown out in a shape, the valve is closed.

1 is a schematic plan view of a screw inspection apparatus according to an embodiment of the present invention. It is an enlarged plan view of the supply mechanism of the inspection apparatus shown in FIG. It is a front view of the supply mechanism shown in FIG. It is an expanded sectional view of the inspection mechanism of the inspection apparatus shown in FIG. It is a figure which shows the image of the screw imaged by the inspection mechanism. It is an expanded sectional view which shows the drive roller of the inspection apparatus shown in FIG. It is an enlarged plan view which shows the removal means of the inspection apparatus shown in FIG. It is an expanded sectional view which shows the state in which the removal nozzle shown in FIG. 7 blows off the nonstandard screw.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Screw 1A ... Screw head 1B ... Shaft part 2 ... Disk 3 ... Guide part 4 ... Supply mechanism 5 ... Transfer guide 6 ... Inspection mechanism 7 ... Light source 7A ... Upper light source 7B ... Lower light source 8 ... Camera 9 ... Calculation tester 10 DESCRIPTION OF SYMBOLS ... Through-hole 11 ... Drive roller 12 ... Supply guide 13 ... Side wall 14 ... Air nozzle 15 ... Open / close valve 16 ... Air source 17 ... Motor 18 ... Position sensor 19 ... Removal means 20 ... Removal sensor 21 ... Removal nozzle 22 ... Open / close valve 23 ... light source 24 ... photoreceptor 25 ... removal guide 26 ... extraction arm 27 ... non-defective guide

Claims (9)

A disc (2) provided with a guide portion (3) at a predetermined interval for inserting the shaft portion (1B) of the screw (1) and transferring the screw head (1A) to the upper surface in an arcuate outer peripheral edge portion. ), A supply mechanism (4) for supplying the screw (1) to the guide part (3) of the disk (2), and a screw (1) supplied to the guide part (3) by the supply mechanism (4). Inspection to inspect the transfer guide (5) arranged on the outside of the disk (2) and the screw (1) transferred by the disk (2) so as to be held and transferred by the guide part (3) Mechanism (6) and
The inspection mechanism (6) receives a light source (7) that emits light toward the screw (1), and receives light emitted from the light source (7) into a silhouette video signal indicating the outline of the screw (1). A camera (8) to be converted, and an arithmetic inspection device (9) for calculating and inspecting the screw (1) by calculating a video signal output from the camera (8),
The disk (2) is provided with a through hole (10) on the inside, and a light source (7) is disposed inside the through hole (10), and the light source (7) is provided from the inside of the disk (2). It is arranged to irradiate light toward the outer periphery and light toward the screw (1) of the guide part (3), and the camera (8) is arranged outside the disk (2). The light emitted from the light source (7) toward the screw (1) is received by the camera (8), the screw (1) is imaged as a silhouette image, and a video signal is output from the camera (8). A screw inspection device configured to inspect the screw (1) by processing the output video signal with an arithmetic inspection device (9). A disc (2) provided with a guide portion (3) at a predetermined interval for inserting the shaft portion (1B) of the screw (1) and transferring the screw head (1A) to the upper surface in an arcuate outer peripheral edge portion. ), A supply mechanism (4) for supplying the screw (1) to the guide part (3) of the disk (2), and a screw (1) supplied to the guide part (3) by the supply mechanism (4). Inspection to inspect the transfer guide (5) arranged on the outside of the disk (2) and the screw (1) transferred by the disk (2) so as to be held and transferred by the guide part (3) Mechanism (6) and
The inspection mechanism (6) receives the light emitted from the light source (7) toward the screw (1) and the silhouette image indicating the outline of the screw (1) by receiving the light emitted from the light source (7). A camera (8), and a calculation inspection device (9) for calculating and inspecting the screw (1) by calculating a video signal output from the camera (8),
The disk (2) has a through hole (10) on the inside, a camera (8) is disposed inside the through hole (10), and a light source (7) is disposed on the outside of the disk (2). The light source (7) is arranged to emit light from the outside to the inside of the disk (2) and to the light (1) of the guide part (3). The light emitted from the light source (7) toward the screw (1) is received by the camera (8), and the camera (8) captures the screw (1) as a silhouette image and outputs a video signal. A screw inspection apparatus configured to inspect the screw (1) by performing arithmetic processing on the video signal output from (8) by the arithmetic inspection device (9).   The camera (8) receives the image of the screw (1) in synchronization with a timing signal output from a position sensor (18) for detecting the position of the guide portion (3) of the disk (2). Screw inspection device described in 1.   The light source (7) is a surface light source, and simultaneously illuminates multiple screws (1) .The camera (8) receives the outline of the multiple screws (1) as a silhouette image, and the arithmetic tester (9 The screw inspection device according to claim 1 or 2, wherein a plurality of screws (1) are inspected simultaneously.   The light source (7) includes an upper light source (7) that irradiates light to the head portion of the screw (1), and a lower light source (7) that irradiates light to the shaft (1B) of the screw (1), The screw inspection apparatus according to claim 1 or 2, wherein the upper light source (7) irradiates the screw (1) with light farther from the screw (1) than the lower light source (7).   The screw inspection device according to claim 1 or 2, wherein the light source (7) is continuously turned on to irradiate the screw (1) with light.   The screw inspection device according to claim 1 or 2, wherein the light source (7) emits light in synchronization with the transfer of the screw (1). The screw inspection device according to claim 1 or 2, wherein a drive roller (11) for rotating the disk (2) is disposed in the through hole (10) of the disk (2). The screw inspection device according to claim 8, wherein the screw (2) is arranged outside the drive roller (11) so that the disk (2) can be attached and detached.

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