JPH03202182A - Device for inspecting head of rod material - Google Patents

Abstract

PURPOSE:To permit a proper inspection by a method wherein the head of a rod material is locked by the use of the conveying belt consisting of transparent material and such rod materials are arranged in a row and fed in a predetermined position. CONSTITUTION:A number of screws 2 is sent to a sorting roll 5 in a predetermined lot and the screw having the head of a predetermined diameter alone is sent from an acceptable product take-away chute 7b through a communicating chute 8 onto taper roller 9. When the screw 2 reaches the tapor roller 9, since the taper roller 9 is rotating by the rotation of a rotary source 13, the screws 2 are arranged in a row and sent to its forward side by its large diameter part rotating at a high circumferential speed and, as it approaches the small diameter part thereof rotating at a low circumferential speed, the screw 2 is moved forward slowly, whereby it can be transferred smoothly onto a guide chute 15 from the taper roller 9. When the screw 2 under a CCD camera 22, the screw 2 receives light from a stroboscope to produce its silhouette by which the distinction between the acceptable and rejectable shapes of the screw head is possible.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is a method of transporting headed bars such as screws in a row by locking the heads of the headed bars with two conveyor belts made of transparent material. The present invention relates to an improvement of a head inspection device for a headed bar, which is configured to feed a headed bar to a predetermined position and recognize the shape of the head with a CCD camera to determine the quality of the headed bar. [Prior Art] Recently, various inspection devices have been developed that use CCD cameras to recognize the shapes of various parts and instantly determine whether the parts are good or bad. As an example of this, there is a head inspection device that determines whether the shape of the head of a bar with a head manufactured in large quantities, such as a screw, is good or bad. This head inspection device has two conveyor belts made of transparent material arranged at a predetermined interval, and these conveyor belts lock the head of a screw of an example of a headed bar material and screw the screw. It is configured to continuously supply a line of water horizontally. Further, a strobe and a CCD camera that receives the light beam are arranged at positions sandwiching the movement path of the screw, so that the screw is
When positioned in front of the D camera, the strobe is activated and the silhouette of the screw head is binarized and stored for each pixel that makes up the image of the CCD camera, and the silhouette is recorded using the binarized data corresponding to each pixel. is recognized and its acceptability is determined. In this head inspection device 1, as shown in FIG. 6, when feeding the screws 2 onto the conveyor belt 21, it is necessary to feed the screws 2 in a line without overlapping each other. In order to facilitate the transfer onto 21, a tapered roller 9 with a thin tip is used. This tapered roller 9 moves the screw 2 onto the conveyor belt 21.
When feeding upward, the misaligned screws 2 on the tapered roller 9
The tip of the tapered roller 9 is removed from the conveyor belt 2 by air blowing at its tip.
A guide chute 15 is disposed between the tapered roller 9 and the conveyor belt 21. This guide chute 15 has a guide path extending in the same direction as the gap between the two taper rollers 9, and a part of this guide chute 15 is located below the taper roller 9, and the screw 2 suspended from the taper roller 9 Even if the leg portions of the guide chute 15 are inclined, the guide chute 15 is configured to reliably guide the guide chute 15. [Problems to be Solved by the Invention] In this head inspection device 1, when the screws 2 move on the tapered roller 9, they are aligned in the - row and sequentially move onto the guide shoe 15 from the lower end thereof. At this time, even if the screw 2 moves onto the guide chute 15, it will stop at that position because the slope of the guide chute 15 is gentle. In this state, the subsequent screws 2 are similarly transferred onto the guide chute 15, pushing the previous screws 2 from the rear to the front, and the first screw is sequentially fed onto the conveyor belt 21 and sent to the predetermined inspection position. It will be done. However, depending on the head shape of screw 2, the following screw 2
may transfer to the upper part of the head of the previous screw 2. In this case, the screws 2 overlap on the guide chute I5 and are transferred to the conveyor belt 21 in that state to reach the inspection position, resulting in disadvantages such as the inability to perform a normal inspection. It is occurring. The present invention aims to eliminate the above-mentioned drawbacks, and when feeding headed bars from tapered rollers arranged at predetermined intervals onto a conveyor belt via a guide chute, the tapered rollers adjoin the guide chute. It is an object of the present invention to provide a head inspection device for headed bars configured so that the heads of the headed bars do not overlap. [Means for Solving the Problems 1] In order to solve the above problems, two tapered rollers are gently inclined and rotatably disposed at intervals through which the legs of a predetermined headed bar pass. A guide chute having an upper surface continuously extending in the same direction is disposed at the lower end of each of the tapered rollers, and a portion of the guide chute is configured to be located below the tapered roller. Further, the guide chute is configured so that the leg portion of the headed bar that is suspended from the tapered roller and moves is easily guided to the guide path formed by the guide chute. Two conveyor belts made of a transparent material are disposed at the tip of the guide chute with a gap through which the legs of the headed bar can pass, and these two conveyor belts are movable in a circular manner. The conveyor belt is configured to lock the heads of the headed bars so that the headed bars are continuously fed in a line in a substantially horizontal direction. Further, a light source and a CCD camera are arranged to sandwich the moving path of the headed bar on the conveyor belt, and a CCD camera receives the light beam.
When positioned in front of the camera, the light source is activated, and the silhouette of the head of the headed bar is binarized and stored for each pixel that makes up the image of the CCD camera, and the binarized data corresponding to each pixel is stored. The configuration is such that the shape of the silhouette is recognized and the quality of the headed bar is determined. Furthermore, a portion of the upper surface of each of the guide chutes is cut out to form a stepped portion on the upper surface. The tip of the tapered roller is located at this stepped portion, and the upper surface of the guide chute is configured to be located slightly lower than the locking surface of the headed bar of the tapered roller. [Function] In this head inspection device, when a headed bar is supplied in front of a CCD camera, a light beam is emitted from the light source to determine whether the shape of the head of the headed bar is good or bad. When feeding the loaded rods to the front of the CCD camera, a large number of loaded rods are aligned in a line by a tapered roller and sent onto a guide chute, and then fed from the guide chute to a conveyor belt. At this time, the head of the headed bar that has reached the tip of the taper roller is locked by the taper roller and transferred onto the guide chute, but the tip of the taper roller is located at the step of the guide chute, and the locking surface of the taper roller and the upper surface of the guide chute are located on almost the same plane. Therefore, the headed bar can be smoothly transferred from the tip of the tapered roller onto the guide chute. Also,
Since the slope of the guide chute is gentle, the headed bar slides for a while and stops, but when the following headed bar moves from the taper roller to the guide chute, it collides with the side of the head, and the head on the forward side To reliably push the attached bar forward. Therefore, the heads of adjacent headed bars do not overlap, and the headed bars are reliably aligned in a line and sent to the conveyor belt, and then sent to the inspection position in the correct posture to determine whether it is good or bad. It can be performed. [Example] Hereinafter, an example will be described based on the drawings. In FIGS. 1 to 4, ``■'' is an apparatus for inspecting the head of a screw 2, which is an example of a bar with a head, and has a base 3. This base 3 has a bowl feeder 4 that stores a large number of screws 2 and discharges them in predetermined quantities from a discharge chute 4a, and two bowl feeders 4 that are inclined with a gap necessary to select screws 2 with a desired head diameter. A sorting roller 5 is arranged via a mounting plate 6. The upper end of the sorting roller 5 is located below the discharge shoe 4a of the bowl feeder 4.
A predetermined amount of screws 2 are supplied onto the sorting roller 5 from a. The sorting roller 5 is driven by a rotational drive source 5.
It is configured to rotate in response to the rotation of a, and is configured to feed the screws downward while aligning them in the - row. Further, the side surface of the sorting roller 5 is covered with a cover 7, and the bottom of the cover 7 has a defective product discharge chute 7a, depending on the position for taking out defective products and non-defective products to be sorted, respectively.
A chute 7b for taking out non-defective products is attached. A connecting chute 8 is tilted and fixed to the good product taking out chute 7b, and the screw 2 taken out from the good product taking out chute 7b naturally falls down the communicating chute 8 and is supplied to the vicinity of the upper end of a taper roller 9, which will be described later. It is configured as follows. Further, on the base 3, two rotating shaft parts 11 each having a taper roller 9 extending coaxially at one end are positioned in parallel via a first mount lO and are rotatable with a gentle inclination. installed. Pulleys 12 are fixed to the other ends of the rotating shaft portions 11 so as to be located on the same plane, and these pulleys 12 are attached to the first mounting base 10 located below the rotating shaft portion 11. Fixed rotary drive source 1
A round belt 14 that rotates in response to the rotation of 3 is wound around the belt. The two tapered rollers 9 are installed so as to form a gap that extends in parallel to the screw 2 having the desired head diameter with its legs facing downward, and the tips of the tapered rollers 9 are attached to the screw 2. A guide shoe (to be described later) is formed thin enough to lock the seat surface of the head of screw 2, and slows down its forward speed as the screw 2 approaches the tip of the tapered roller 9.
The structure is such that the transfer to No. 15 can be performed smoothly. Further, two belt mounting plates 16 are fixed to the base 3 via a second mounting 17, which stand upright at a predetermined distance from each other at a position on the advancing side of the tapered roller 9. A plurality of conveyor belt pulleys 20 are rotatably attached to both ends of each belt attachment plate 16 along opposing surfaces thereof. The conveyor belt pulleys 20 located at the opposing positions are configured to be able to rotate together in response to the rotation of a rotational drive source (not shown).
The book conveyor belt 21 is moved in the same direction at the same speed to continuously supply the screws 2 in a line. Further, a guide plate I8 is provided horizontally on each of the belt mounting plates 16 along the extending direction thereof, and auxiliary plates 19 located on both sides of the guide plate 18 and extending on the extension thereof are provided on the side of the conveyance pulley 20. It is installed to cover the area. The inner surfaces of the guide plate 18 and the auxiliary plate 19 are configured to form a guide path for the screw 2 together with the guide plate 18 and the auxiliary plate 19 located at opposing positions. Two conveyor belts 21 made of a transparent material and extending along each belt mounting plate 16 are wound around the conveyor belt pulley 20.
are configured so that the back side of each moves while being guided by the upper surface of the guide plate 18, and the screws 2 are held in the correct posture and moved approximately horizontally to an inspection position below a CCD camera 22, which will be described later. . The guide plate 18 is removed at the inspection position, and is configured so that a light beam from a strobe 23, which will be described later, passes across the conveyor belt 21 from below. At a predetermined inspection position on the travel path of the screw 2, a strobe 23, which is an example of a light source, and a CCD camera 22 that receives the light beam are arranged so as to sandwich the travel path of the screw 2. When positioned below, the strobe 23 is activated and the silhouette of the head of the screw 2 is binarized and stored for each pixel that makes up the image of the CCD camera 22, and the silhouette is created using the binarized data corresponding to each pixel. The head shape of the screw 2 is recognized and the quality of the head shape of the screw 2 is determined. On the other hand, a guide chute 15 is attached to each of the belt mounting plates 16 so as to be located on the tapered roller 9 side via a mounting block 24, and the gap of the guide chute 15 is approximately the same size as the gap of the tapered roller 9. The screw 2 is guided by these two opposing guide shoes 15 and is configured to move on the upper surface of the guide chute 15. A portion of the upper surface of each guide chute 15 is cut out, and a stepped portion 15a is formed on the upper surface. This step 1
The tip of the tapered roller 9 is located at 5a,
A portion of the guide chute 15 is located below the tapered roller 9. This guide shoot 1
The inner surface of the screw 5 forms a guide path together with the opposing guide chute 15, and the screw entry end side of the inner surface is an inclined surface so that the leg of the screw 2, which is suspended from the tapered roller 9 and moves, smoothly passes through the guide chute. 15. Further, the upper surface of the guide chute 15 is inclined in the same direction as the screw locking surface of the tapered roller 9, and is located slightly lower than the locking surface. Further, the lower end side of this guide chute 15 is formed into a curved shape that partially covers the upper surface of the conveyor belt 21, and the negative part thereof covers the upper side of the guide chute 15 to ensure that the screw 2 on the guide chute 15 is secured. 6. In the head inspection device described above, a large number of screws 2 stored in the bowl feeder 4 are sent to the sorting roller 5 in predetermined quantities to sort out a predetermined head diameter. Only the screws 2 held are sent from the non-defective product take-out chute 7b via the communication chute 8 onto the tapered roller 9. When the screws 2 reach the taper roller 9, since the taper roller 9 is rotating under the rotation of the rotary drive source 13, the screws 2 are aligned in a line at the large diameter portion where the circumferential speed is high and sent to the tip side. When the screw 2 approaches the small diameter portion where the circumferential speed is slow, the screw 2 slowly moves forward and can smoothly transfer from the tapered roller 9 to the guide chute 15. At this time, as shown in FIG. 5, the guide chute starts from the tapered roller 9.
Since the slope of the guide chute 15 is gentle, the screw 2 transferred to the screw 5 stops after slightly sliding on the guide chute 15. In this state, the succeeding screw 2 is similarly
- 4 - The parroller 9 is transferred onto the guide chute 15, but since the locking surface of the tapered roller 9 and the upper surface of the guide chute 15 are almost on the same plane, this screw 2 is transferred to the screw 2 on the forward side.
The screw 2 does not ride on the head of the screw 2, and collides surely with the side surface of the head of the screw 2 on the forward side to further push it forward. Therefore, the heads of a plurality of adjacent screws 2 do not overlap on the guide chute 15, and are fed in alignment in the - row, so that the first screw 2 is reliably fed onto the conveyor belt 21. After that, when the screw 2 is held by the conveyor belt 21 and reaches below the CCD camera 22 at a predetermined inspection position, a light beam is emitted from the strobe 23, and the silhouette of the head of the screw 2 forms an image of the CCD camera 22. Each pixel is binarized and stored, and the silhouette is recognized from the binarized data corresponding to each pixel, making it possible to correctly determine whether the head shape of the screw 2 is good or bad. [Effects of the Invention J As explained above, the present invention supplies headed bars aligned in a line from a tapered roller through a guide chute onto a conveyor belt, and also supplies them to a predetermined inspection position by the conveyor belt. Further, the upper surface of the guide chute is cut out to form a stepped portion, and the tip of the tapered roller is positioned in this stepped portion so that the upper surface of the guide chute is positioned slightly lower than the locking surface of the tapered roller. Because of this structure, when headed bars are transferred from the taper roller onto the guide chute, adjacent headed bars do not overlap and are fed in a line on the guide chute, ensuring that the heads are placed on the conveyor belt. This method has advantages such as being able to supply bars and properly inspecting predetermined headed bars.

[Brief explanation of drawings]

FIG. 1 is an enlarged vertical cross-sectional view of the principal part of a screw head inspection device according to an example of the present invention, FIG. 2 is a partially cutaway front view of the head inspection device of FIG. 1, and FIG. FIG. 4 is a cross-sectional view of the main part taken along line A-A in FIG. 3, and FIG. 5 is an operation of the head inspection device according to the present invention. FIG. 6 is an explanatory view of the main parts of the conventional head inspection device. 1 head inspection device, 2 screw, 3 base, 4 bowl feeder, 4a
discharge chute, 5 sorting roller, 5a rotational drive source, 6 mounting plate, 7 cover,
7a Defective product discharge chute. 7b Good product removal chute, 8 Communication chute, 9
Taper roller, 10 first mounting base, 11 rotating shaft portion, 12 pulley, 13 rotational drive source, 14 round belt, 15 guide chute, 15a step portion, 16 belt mounting plate, 17 second mounting base. 18 guide plate, 19 auxiliary plate,
20 Transport belt pulley, 21 Transport belt, 2
2 CCD cameras, 23 strobes, 24 mounting blocks,

Claims (1)

[Scope of Claims] Two tapered rollers are arranged so as to be rotatable with a gentle inclination at intervals through which the legs of a predetermined headed bar pass, and an upper surface that extends in the same direction continuously from the lower end of each of the tapered rollers. A guide chute is arranged, and a part of this guide chute is positioned below the taper roller so that the leg of the headed bar that moves while being suspended from the taper roller is guided to the guide path formed by the guide chute. At the same time, two conveyor belts made of transparent material are disposed at the tip of the guide chute with a gap through which the legs of the headed bar can pass, and these two conveyor belts are arranged so as to be able to circulate. The belt is configured to lock the head of the headed bar so as to continuously feed the headed bar in a line in a substantially horizontal direction, and the belt is positioned so as to sandwich the moving path of the headed bar. A light source and a CCD camera that receives the light beam are arranged, and when the headed bar is positioned in front of the CCD camera, the light source is activated to capture the silhouette of the head of the headed bar for each pixel that makes up the image of the CCD camera. In head inspection equipment for headed bars, the shape of the silhouette is recognized from the binarized data corresponding to each pixel, and the quality of the headed bar is determined. The feature is that a part of the tapered roller is cut out to form a stepped part, and the tip of the tapered roller is positioned in this stepped part so that the upper surface of the guide chute is positioned slightly lower than the locking surface of the headed bar of the tapered roller. Head inspection device for headed bars.