JP3682991B2 - Parts sorting device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a parts sorting apparatus, and more particularly, to a parts sorting apparatus that detects feature points of parts traveling on a track in a predetermined direction, eliminates unnecessary parts, and passes necessary parts.
[0002]
[Prior art]
Figure 5 is a diagram showing the overall structure of a conventional component sorting device, FIG 6 is a partially cutaway plan view showing a main part of the component sorting apparatus shown in FIG. 5, line X in FIG. 7 6 It is a block diagram which shows the sectional drawing in alignment with -X, and the structure of an apparatus.
[0003]
5 to 7, the component sorting apparatus 1 is provided with a bowl 2, and a movable core or an electromagnet (not shown) is disposed on the bottom wall portion of the bowl 2. Due to these actions, vibration is applied to the bowl 2. A spiral component conveying track 3 is formed on the inner peripheral wall 2a of the bowl 2, and its discharge end portion is a straight track 4, from which components are supplied to the next process.
[0004]
As shown in FIG. 6, the component 51 is conveyed on the track 32 while being vibrated. In place of the inner circumferential wall 31a of the bowl 31 has an air ejection port 33 facing the track 32 is opened, the air ejection port 33 to the compressed air supply device 36 through the electromagnetic valve 35 by the air supply pipe 3 4 It is connected. Further, as shown in FIG. 7, a reflection type photosensor 37 is provided so as to face the track 32, and the detection point S is arranged in the vicinity of the air ejection port 33. The controller 38 controls the electromagnetic valve 35 in accordance with the output of the photosensor 37, jetting compressed air from the air ejection port 3 3. According to such a component sorting apparatus 1, the component 51 can be sorted based on the difference in light reflectance on the surface of the component 51.
[0005]
FIG. 8 shows examples of various components. For example, as shown in FIG. 8 (a), a plate-like component 51 having a black one surface 51a and a white other surface 51b is conveyed in a random state such that the black surface 51a is up or the white surface 51b is up. In this case, it is possible to eliminate all the parts 51 conveyed with the white surface 51b up, and allow only the parts 51 conveyed with the black surface 51a to pass.
[0006]
However, as shown in FIG. 8 (b), the component sorting device 1 has a prismatic shape with a width W and a thickness T close to each other, and has only the upper surface 52a among the four surfaces 52a, 52b, 52c, and 52d. 52 cannot be selected. That is, when the central portion of the upper surface 52a of the component 52 is black and both sides thereof are white, if the upper surface 52a of the component 52 is detected by the photosensor 37, white 52e → black 52f → white 52g is discriminated. Therefore, the component 52 is also excluded in the conventional component selection apparatus 1.
[0007]
[Problems to be solved by the invention]
For this reason, in order to select a component as shown in FIG. 8B, a trigger sensor is provided separately from the photosensor 37 in order to detect the white portion at the tip of the component 52. In this case, when the white portion 52e is detected, and then the photosensor 37 detects the black portion 52f, the component 52 is allowed to pass through and other components are excluded. However, a trigger sensor must be provided separately, and after the trigger sensor detects the white portion 52e, when the photosensor 37 detects the black portion 52f, the compressed air is not ejected from the air outlet 33. Therefore, there is a disadvantage that the configuration and processing of the apparatus become complicated.
[0008]
SUMMARY OF THE INVENTION Therefore, a main object of the present invention is to provide a parts sorting device that conveys a part with a characteristic surface on the bottom surface and detects the characteristic surface from the lower side without providing a trigger sensor. .
[0009]
[Means for Solving the Problems]
This invention detects a component traveling through a and on the track feature points in a predetermined direction on its underside, to eliminate unnecessary components, a component selection system for passing the necessary parts, components progression Features of two gas jets provided on the side of the track at predetermined intervals greater than or equal to the length of the component in the direction, and the lower surface of the component from below the predetermined position of the track between the two gas jets A sensor for detecting the pressure, an electromagnetic valve for selectively supplying compressed gas to one of the two gas jets, and two gas jets when the sensor does not detect a feature point on the lower surface of the part Compressed gas is supplied to the downstream gas outlet to eliminate unnecessary parts, and when the sensor detects a feature point on the lower surface of the part, the gas outlet is upstream for a predetermined time. Ru is passed through the required component by supplying a compressed gas Configured with a control device for controlling the urchin electromagnetic valve.
[0010]
[Action]
The component sorting apparatus according to the present invention conveys a component having a feature point on its lower surface onto a track, and when the feature point on the lower surface of the component is detected by a sensor provided on the lower side of the track, it is upstream for a predetermined time. is ejected compressed gas from gas outlet side is passed through the necessary parts, it comes to have not detected feature points you eliminate unnecessary components by ejecting the compressed gas from the gas outlet of the downstream side.
[0011]
【Example】
FIG. 1 is a partially broken plan view of one embodiment of the present invention and corresponds to FIG. 6 of the conventional example. 2 is a cross-sectional view taken along line YY shown in FIG.
[0012]
In FIG. 1, two air jets 5 and 6 are provided at a portion of the inner peripheral wall 2 a of the bowl 2 that comes into contact with the component 52 with a gap slightly larger than the length of the component 52 to be supplied. The air outlets 5 and 6 are connected to the output ports 8 a and 8 b of the electromagnetic valve 8 by the air supply pipe 7, respectively. The input port 8 c of the electromagnetic valve 8 is connected to the compressed air supply device 9 by the air supply pipe 7. The electromagnetic valve 8 normally causes the compressed air supplied to the input port 8c to be ejected to the output port 8b, and the compressed air supplied to the input port 8c is ejected to the output port 8a only when the control signal Q is input. Let
[0013]
A slit 12 extending in the traveling direction is formed in the track 3, and a reflective photosensor 10 is provided below the slit 12. The photo sensor 10 is provided between the two air jets 5 and 6 and detects the reflected light of the white portion 52 e at the tip of the component 52. A detection signal of the photosensor 10 is given to the control device 11. The control device 11 detects that the white portion 52e of the component 52 is detected by the photosensor 10, and the control signal Q is electromagnetically generated for a predetermined time T ₀ in response to the output being inverted from “L” level to “H” level, for example. Output to valve 8. Therefore, as shown in FIG. 3A, compressed air is discharged from the upstream air outlet 5 for a predetermined time T _{0 after} the output of the photosensor 10 is inverted from the “L” level to the “H” level. The ejection and the ejection of compressed air from the downstream air ejection port 6 are stopped.
[0014]
Next, the operation of the component sorting apparatus according to one embodiment of the present invention will be described. First, as shown in FIG. 4C, the white parts 52e and 52g of the rectangular component 52 are supplied so as to face the lower surface. Here, the distance between the air outlets 5 and 6 is D, the distance between the downstream air outlet 6 and the detection point S of the photosensor 10 is d, and the length of the long side of the part 52 is L _1. The traveling speed of 52 is v. A time T during which the component 52 having a desired posture passes through the downstream air jet port 6 after reaching the detection point S of the photosensor 10 is expressed by the following equation.
[0015]
T = (d + L ₁ ) / v
Accordingly, the time T ₀ given to the control signal Q from the control device 11 to the electromagnetic valve 8 in response to the detection of the white portion 52e by the photosensor 10 so that the component 52 having a desired posture passes can be expressed by the following equation. Set to meet.
[0016]
T ₀ > (d + L ₁ ) / v
Further, the distance Dd between the upstream air jet port 5 and the detection point S of the photosensor 10 is excluded so that the component 52 that has been closely conveyed after the component 52 in a desired posture is excluded. It is set to satisfy.
[0017]
2L ₁ >D−d> L ₁
As shown in FIG. 4A, when the component 52 has been conveyed with its white portions 52e and 52g facing upward, the white portion 52e of the component 52 is not detected by the photosensor 10, so that the component 52 is on the downstream side. The air is blown off to the bottom of the bowl 2 by compressed air from the air outlet 6.
[0018]
In addition, as shown in FIG. 4B, when the component 52 is conveyed with the white portions 52e and 52g as the lower surface, the white portion 52e of the component 52 has reached the detection point S of the photosensor 10. Accordingly, the jet of compressed air is switched from the downstream air outlet 6 to the upstream air outlet 5 for a predetermined time T ₀ . Therefore, the component 52 passes through without being blown away by the compressed air.
[0019]
Further, as shown in FIG. 4C, when another component 52 is conveyed in close contact behind the component 52 in a desired posture, the compressed air blows out from the downstream air jet port 6 to the upstream. When switching to the side air outlet 5, the subsequent component 52 is blown away. Therefore, only the component 52 in a desired posture is supplied to the component supply unit.
[0020]
In addition, since the parts 52 are selected in advance so as to advance in the long side direction, it is not necessary to consider the case where the parts 52 advance in the short side direction. Further, the probability that the component 52 in the desired posture is conveyed is ¼, and the probability that the component 52 in the desired posture is conveyed in close contact with each other is extremely small. Even if all of the above are eliminated, the sorting ability of the part 52 does not decrease so much.
[0021]
【The invention's effect】
As described above, according to the present invention, when a part having a feature point on the lower surface thereof is conveyed, the feature point of the part is detected from the lower surface of the track, and upstream by a predetermined time according to the detection output. When the compressed gas is supplied to the gas outlet on the side and the feature point is not detected, the compressed gas is ejected from the gas outlet on the downstream side, so there is no need to provide a reversing chute, a trigger sensor, etc. Moreover, processing can be simplified.
[Brief description of the drawings]
FIG. 1 is a partially broken plan view of an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line YY in FIG.
FIG. 3 is a time chart for explaining the operation of one embodiment of the present invention;
FIG. 4 is a diagram for explaining the operation of one embodiment of the present invention.
FIG. 5 is a diagram showing an overall configuration of a conventional component sorting apparatus.
6 is a partially broken plan view showing a main part of the component sorting apparatus shown in FIG. 5. FIG.
7 is a cross-sectional view taken along line XX in FIG. 6 and a block diagram showing the configuration of the apparatus.
FIG. 8 is a diagram illustrating an example of various components.
[Explanation of symbols]
3 Tracks 5 and 6 Air outlet 8 Electromagnetic valve 9 Compressed air supply device 10 Photo sensor 11 Control device 12 Slit

Claims (1)

A part selection device that detects a part having a feature point on its lower surface and travels in a predetermined direction on a track, eliminates an unnecessary part, and passes a necessary part.
Two gas jets provided on a side surface of the track at a predetermined interval not less than the length of the component in the traveling direction of the component;
A sensor for detecting a feature point of the lower surface of the component from below a predetermined position of the track between the two gas jets;
An electromagnetic valve that selectively supplies compressed gas to any one of the two gas jets; and
When the sensor does not detect a feature point on the lower surface of the component, compressed gas is supplied to a downstream gas jet port of the two gas jet ports to eliminate the unnecessary component, and the sensor in response to the detection of feature points of the lower surface of the component, a control device for controlling said solenoid valve so that by supplying the compressed gas to only the upstream side of the gas outlet a predetermined time is passed through the necessary components A part sorter equipped with

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