JPH0321889A - Automatic tuning mechanism for sensor - Google Patents

Abstract

PURPOSE:To adjust the sensitivity speedily by inputting levels signals which are inputted to the sensor while a body to be detected is absent to an arithmetic means and setting the sensor sensitivity level to the intermediate value among them. CONSTITUTION:A signal inputted to a photodetecting element 33 is amplified by an analog amplifier 35 and converted by an A/D converter 37. Its digital signal is inputted to the input part 4 of a storage and arithmetic means 39. Signals from an absence time storage switch 43, a presence time storage switch 45, a sensitivity switch 47, and a storage switch 49 are inputted to the input part 41. When the switch 47 is pressed, an absence time input level L1 and a presence time input level L2 stored in a storage part 65 are inputted to an arithmetic part 53 and the sensor sensitivity level is set to the intermediate value (L1+L2)/2. The value of the intermediate value sensor sensitivity level is stored in the storage part 65 and compared with a current input signal level from the photodetecting element 33 according to a processing program stored in the storage part 51, and when the value of the input signal level is larger, an ON signal is outputted to an output part 57.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an auto-tuning mechanism for a sensor for setting the sensitivity level of the sensor.

[Conventional technology]

Generally, in various production lines, various sensors are used to detect when a predetermined part or the like flowing through the production line has reached a predetermined position.

As shown in FIG. 4, such a sensor outputs light from a light projecting element 13 to an object 11 to be detected, receives the light reflected from the object 11 by a light receiving element 15, and detects the object 11. A light reflection type photoelectric switch that detects the presence or absence of the detection object l1.
Tutsi l7 is often used.

FIG. 5 shows an amplifier for adjusting the sensitivity of the electric switch 17. In this amplifier, the sensitivity adjustment is performed by first turning the trimmer 19 to the right in the absence of the detected object 11, and then turning the trimmer 19 to the right. The position A where the indicator light 2l lights up is visually confirmed.

Thereafter, the trimmer 19 is rotated to the left while the object to be detected 1l is present, and the position B where the operation indicator light 21 goes out is visually confirmed.

Finally, place the trimmer l at position C between A and B.
The sensitivity is adjusted by rotating the trimmer 9 and stopping the trimmer 19 at this position.

[Problem to be solved by the invention]

However, in such conventional methods, the trimmer 1
Frequent rotation operation of 9 is required, and the operation indicator light 2
It is necessary to remember the positions A and B of the trimmer 19 at which the trimmer 19 is turned on or off, respectively, and there is a problem in that a great deal of effort is required to adjust the sensitivity.

Further, since the optimum position of the trimmer 19 is set by human judgment, there is a problem that a setting error may occur.

Furthermore, since the trimmer 19 uses a volume, there is a risk that the trimmer 19 may rotate due to vibration, erroneous contact, or the like.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide an auto-tuning mechanism for a sensor that can quickly and reliably adjust the sensitivity of a sensor.

[Means for Solving the Problems] The auto-tuning mechanism for a sensor of the present invention includes a non-use storage means for storing a non-use input level input to the sensor in a state in which there is no detected object; presence storage means for storing the presence input level that is input to the sensor in a state where there is presence, and inputting the above-mentioned absence input level and presence human power level to the calculation means, and setting the sensor to an intermediate value between these input levels. and a sensitivity setting means for setting a sensitivity level.

[Function] In the sensor auto-tuning mechanism of the present invention, the no-time storage means stores the no-manpower level applied to the sensor in the absence of an object to be detected, and the presence-time storage means: The input level when a human input is applied to the sensor in a state where an object to be detected is present is stored in the storage means.

Then, the sensitivity setting means inputs the absent input level and the present input level to the calculation means, and the sensor sensitivity level is automatically set to an intermediate value between these values.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, details of the present invention will be described with reference to an embodiment shown in the drawings.

FIG. 1 shows an embodiment of the sensor auto-tuning mechanism of the present invention. In the figure, reference numeral 31 indicates a light projecting element that outputs light in a predetermined direction, and reference numeral 33 indicates a light emitting element that outputs light in a predetermined direction. It shows a light-receiving element that manually receives reflected light from an object to be detected or a wall surface.

The signal input to the light receiving element 33 is sent to the analog amplifier 35.
The signal is amplified by the analog-to-digital converter 37 and converted into a digital signal.

This digital signal is input to the human power section 41 of the storage/calculation means 39, which is comprised of, for example, an L-chip microcomputer.

On the other hand, the input section 41 of the storage/calculation means 39 includes a memory switch 43 when there is no memory. Signals from the presence memory switch 45, sensitivity setting switch 47, and memory switch 49 are input.

That is, when the memory switch 49 is pressed while pressing the memory switch 43 and the memory switch 49 when there is no object to be detected, the human power level L1 when there is no human power applied to the light receiving element 33 when there is no object to be detected is stored as digital data. Memory·
It is configured to be stored in the storage section 65 of the calculation means 39.

In addition, when the memory switch 49 is pressed while pressing the presence memory switch 45 in a state where there is an object to be detected, the presence input level L2 input to the light receiving element 33 in the state where there is an object to be detected is stored and calculated. Storage section 65 of means 39
It is designed to be stored as digital data.

Thereafter, when the sensitivity setting switch 47 is pressed, as shown in FIG. value, i.e. (LI + Lz)
The sensor sensitivity level L3 is set to a value of /2. The value of this sensor sensitivity level L3 is
It is stored in the storage unit 65 and compared with the current input signal level L from the light receiving element 33 according to the processing program in the storage unit 5l, and when the value of the human input signal level L is large, an on signal is output to the output unit 57. Ru.

When this ON signal is output to the output section 57, the operation indicator light 59 is turned on, and a signal S indicating the presence of the detected object is output to a predetermined control device or the like.

In addition, in the figure, symbols 61 and 63 respectively indicate power supplies.

FIG. 3 shows the front side of the container in which the above-mentioned sensor auto-tuning mechanism is housed.In the center, an absent memory switch 43, a present memory switch 45, and a sensitivity setting switch 47 are arranged. A memory switch 49 is arranged at the bottom, and an operation indicator light 59 is arranged at the top.

In the sensor auto-tuning mechanism configured as described above, the sensor auto-tuning mechanism stores in the storage unit 65 the input level when there is no human input applied to the light receiving element 33 when there is no object to be detected. an empty memory switch 43 and a memory switch 49 for
A presence memory switch 45 and a memory switch 49 are used to store the human input level applied to the light-receiving element 33 in the storage unit 65 when there is an object to be detected, and the presence memory switch 45 and memory switch 49 store the presence input level and the presence human input level in the calculation unit 53. input,
Since the sensitivity setting switch 47 is configured to set the sensor sensitivity level to an intermediate value between these values, it is possible to provide an auto-tuning mechanism for the sensor that can quickly and reliably adjust the sensitivity of the photoelectric switch. In other words, in the sensor auto-tuning mechanism configured as described above, by pressing the memory switch 43 and the memory switch 49, the memory switch 43 and the memory switch 49 are pressed, so that the memory switch 43 and the memory switch 49 are pressed, so that the memory switch 43 and the memory switch 49 are pressed, so that the memory switch 43 and the memory switch 49 are pressed, so that the memory switch 43 and the memory switch 49 are pressed. The level is stored in the memory unit 65, and by pressing the memory switch 45 and the memory switch 49, the level of human power applied to the light-receiving element 33 when an object is present is stored in the memory unit 65. By pressing the sensitivity setting switch 47, the human power level in the absence and the human power level in the presence are input to the calculation unit 53, and the sensor sensitivity level is set to an intermediate value between these, so the photoelectric switch It becomes possible to quickly and reliably adjust the sensitivity.

As a result, it becomes possible to solve the above-mentioned conventional problems all at once.

In the embodiments described above, the present invention was applied to a reflective photoelectric switch, but the present invention is not limited to such embodiments. For example, the present invention is not limited to such embodiments. It goes without saying that the present invention can also be applied to photoelectric switches arranged facing each other, and can also be applied to a wide range of sensor sensitivity settings.

[Effects of the Invention] As described above, in the sensor auto-tuning mechanism of the present invention, the sensor auto-tuning mechanism is configured to store the manual power level input to the sensor in the absence of an object to be detected. a memory means for storing the level of human power applied to the sensor when there is an object to be detected; It consists of a sensitivity setting means that manually sets the sensor sensitivity level to an intermediate value between these values.
This has the advantage that the sensitivity of the sensor can be adjusted quickly and reliably.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the sensor auto-tuning mechanism of the present invention. FIG. 2 is a graph showing sensitivity adjustment levels. FIG. 3 is a front view showing a container in which the sensor auto-tuning mechanism of FIG. 1 is housed. FIG. 4 is an explanatory diagram showing a method of detecting an object using a conventional reflective photoelectric switch. FIG. 5 is a front view showing the amplifier of the photoelectric switch of FIG. 4. [Explanation of symbols of main parts] 31... Light emitting element 33... Light receiving element 43... Memory switch when absent 45... Memory switch when present 47... Sensitivity setting switch 49... Memory Switch 51...Storage unit (processing program storage) 53...Calculation unit 65...Storage unit (data storage).

Claims (1)

[Claims] (1) Absence storage means for storing in a storage means the input level when there is no input to the sensor when there is no object to be detected, and storage means when the input level when input to the sensor is input when there is an object to be detected is stored in the storage means. and a sensitivity setting means for inputting the input level in the absence and the input level in the presence to the calculation means and setting the sensor sensitivity level to an intermediate value between these. Auto-tuning mechanism for sensors.