JPH04290903A - Position sensing device with rotating light emission sensor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position detection device using a rotary light emitting sensor for detecting the flow and position of articles in a monitoring device or an automatic assembly line.

0002

2. Description of the Related Art A conventional article position detection device has two light receiving sections 2 and 3 arranged side by side at a constant interval as shown in FIG. Light emitting sections 1a and 1b are provided opposite each other across the two. The two light receiving sections 2 and 3 are connected to an AND circuit 4a which calculates the outputs from the light receiving sections 2 and 3. When the article a moves in the direction of the arrow, the article a is first detected by the light receiver 2 by blocking the light beam (infrared rays or other) projected from the light emitting section 1a to the light receiver 2, and then the article a is detected by the light receiver 2. By blocking the light beam from the light emitting part 1b, the light receiving part 3 detects the presence or absence of the article, and when the outputs from both the light receiving parts 2 and 3 are obtained at the same time, the product is calculated by the AND circuit 4a, The system is designed to recognize that the item is in the specified location.

0003

[Problems to be Solved by the Invention] However, in the above conventional example, the light emitting part and the light receiving part are constructed as a set, which is required for each detection position, and the mounting position of the light receiving part is shifted. In addition, if a failure occurs in either the light emitting part or the light receiving part, the output becomes zero and the existence of the object is denied even though it actually exists, which is extremely inconvenient. . The present invention aims to solve the drawbacks of the above-mentioned conventional examples and provides a highly reliable position detection device.

0004

[Means for Solving the Problem] First and second light receiving sections, an OR circuit that adds the outputs from both light receiving sections, and light that is alternately emitted to both the light receiving sections through an article distribution path. It consists of a rotating light emitting device.

[0005]

[Operation] When an article reaches a predetermined position in the distribution path, the article first blocks the light beam projected from the light emitting part toward the first light receiving part, thereby confirming the existence of the article and outputting the first detection signal. Then, at the next moment, the light emitting part is swung to direct the projection direction of the light beam toward the second light receiving part, and at this time, the presence of the article is confirmed by the object blocking the light beam to the second light receiving part, and the second light receiving part is confirmed. Outputs a detection signal. Then, the first detection signal and the second detection signal are added in an OR circuit to recognize that the article is in a predetermined position.

[0006]

[Embodiments] The present invention will be described in detail below with reference to embodiments shown in the drawings.The present invention will be described in detail with reference to embodiments shown in the drawings. The first one facing across the aisle.
a second light receiving device 3 located at a position keeping a constant distance from the light receiving device 2 and facing the light emitting device 1; and logic for adding the outputs of the first and second light receiving sections. It consists of a sum circuit 4.

Furthermore, as shown in FIG. 3, the rotary light emitting unit 1 is configured such that conductors 9, 9 are connected to a spring via a pulley 10 between a gap formed by a magnet (for example, N pole) 7 and a magnet (for example, S pole) 8. 11, a light emitting circuit 6 having a light emitting element is supported between the conductors 9, 9, and the light emitting element is oscillated at a predetermined angle.

Next, to describe the operation of the device related to the above configuration, the current control circuit 5 of FIG. 1 is connected to the conductors 9, 9 of FIG.
First, as shown in FIG. 4, by passing a current -i (according to Fleming's left-hand rule), the light emitting element of the light emitting circuit 6 projects a light beam (infrared rays or the like) toward the first light receiving section 2. At this time, when the article a blocks the light beam at the position P1, an article detection signal is output from the first light receiving section. Next, by passing a current i from the current control circuit 5 of FIG. 1 to the conductor 9 of FIG. 3 as shown in FIG. Part 3
A ray of light is projected towards. And as above, article a
outputs an article detection signal from the light receiving section 3 by blocking the light beam from the light emitting section 1 at position P2, and logically calculates the sum of the output from the first light receiving section 2 and the output from the second light receiving section 3. By calculating in the sum circuit 4, it is confirmed that the article a has passed a predetermined position.

The above is a case where the presence of article a is detected by both the first and second light receiving sections 2 and 3, and since the logical sum is taken as a matter of course, the total output becomes "H" level, and the first light receiving section Even if only one of the section 2 or the second light receiving section 3 detects an article, the overall output will be "H" in the same way as above.
” level, which certifies the presence of the article.Furthermore, if neither of the light receiving units 2 and 3 detects the article, the total output becomes the “L” level, denying the existence of the article. .

0010

Effects of the Invention As described above, the present invention swings one light emitting device by rotating it, that is, changing the direction of the input current by a predetermined angle. Not only the number of copies is required, but the configuration becomes simple. Further, by synchronizing the flow speed of the article and the swinging speed of the light emitting section, undetectable conditions due to failures or positional deviations will not occur, and reliability will be significantly improved. And high-speed detection is possible.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of the main parts of the device of the present invention.

FIG. 2 is a plan view of the same operating state as above.

FIG. 3 is a partially enlarged side view of the rotating light emitting section.

FIG. 4 is a diagram showing the correlation between the deflection angle of the current supplied to the rotating light emitting section of the device of the present invention and the position of the article.

FIG. 5 is a schematic plan view showing a conventional system.

[Explanation of symbols]

1 Light emitting part 2 First light receiving section 3 Second light receiving section 4 Logical sum circuit

Claims (1)

[Claims] 1. First and second light receiving sections, an OR circuit that adds outputs from both light receiving sections, and a rotating light emitting device that alternately emits light to both light receiving sections through an article distribution path. A position detection device using a rotating light emitting sensor, characterized by comprising: