JPH0330869Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a fall detection device suitable for use in sorting out good and defective electronic parts.

In general, for electronic components such as transistors and diodes, after product inspection, non-defective products and defective products are separated, and the separated individual electronic components are housed in, for example, a sorting case. At that time, a drop detection device is used to confirm whether the electronic component has definitely fallen into the sorting case.

In conventional fall detection devices, a phototransistor or the like is used as a falling object detection sensor, and a detection pulse output from this detection sensor in response to the passage of a falling object is sent directly or via a monostable multivibrator to a sorting device, etc. input to the controller to be controlled. However, in the case where the detection sensor is directly connected to the controller, there is a problem that the detection pulse is affected by the size, speed, etc. of the falling object, and its output is unstable. To prevent this,
Adding a monostable multivibrator will solve the above problems, but the circuit configuration will be complicated and expensive. Also, if many pieces fall at the same time,
Detection of each falling object tends to be uncertain, and furthermore, problems arise in that the controller is subject to time constraints in order to determine the input timing of detection pulses.

The present invention was developed in view of the above-mentioned problems. Even if there are many falling objects at the same time, each object can be detected reliably, the circuit is relatively simple, and there is no time restriction for the controller. The purpose of the present invention is to provide a fall detection device.

Hereinafter, the present invention will be explained in detail based on an embodiment shown in the drawings.

The figure is a circuit diagram of the fall detection device of the present invention. In the figure, reference numeral 1 is a fall detection device, and 2a to 2n are detection sections, and n detection sections 2a to 2n are provided according to the number of falling objects to be detected. Since each of these detection units 2a to 2n has the same configuration, one detection unit 2a will be explained in more detail below.

The detection unit 2a has a detection sensor 3 that detects a falling object and generates a pulse output in response to its passage,
This detection sensor 3 includes a light emitting diode LED 1 and a phototransistor Tr ₁ arranged opposite to the light emitting diode LED 1.
It consists of a photocoupler consisting of. Reference numeral 4 denotes a controller that performs various controls such as an electronic component sorting device (not shown) based on the pulse output of the detection sensor 3. A flip-flop 5 for latching the pulse output of the detection sensor 3 is provided between the detection sensor 3 and the controller 4. One input terminal J of the input terminals J and K of this flip-flop 5 is commonly connected to the phototransistor Tr ₁ of the detection sensor 3 and a reference power supply Vcc via a resistor R ₁ , and the other input terminal K is connected to the reference power supply Vcc through a resistor R 1. is connected to the reference power supply Vcc via resistor _R2 . Also, one of the output terminals Q of the flip-flop 5
is connected to the input terminal of the controller 4, and the other is connected to the base of the transistor _Tr2 . A light emitting diode LED2 for monitoring the fall is connected to this transistor _Tr2 .

Next, the operation of each part when a group of falling objects is detected by the fall detection device 1 having the above configuration will be explained.

Now, assume that in an initial state where there are no falling objects such as electronic parts, the output level of each flip-flop 5 of each of the detection units 2a to 2n is at a high level at one output terminal Q and at a low level at the other output terminal. . Also, at this time, one of the input terminals J and K of the flip-flop 5 is at a low level because the phototransistor Tr ₁ receives the light from the light emitting diode LED 1 and is conductive, and the other terminal K is at the reference voltage source. Always at high level due to Vcc. From this state, for example, one of the group of fallen objects such as sorted electronic components is detected by the light emitting diode LED1 and phototransistor _Tr1 of the detection unit 2a.
During the passage, the light from the light emitting diode LED1 is blocked by the falling object.
Therefore, the phototransistor Tr ₁ becomes non-conductive, and the reference power supply Vcc is applied to one input terminal J of the flip-flop 5. That is, the detection sensor 3 generates a pulse output in response to the passage of the falling object, and this pulse output is applied to one input terminal J of the flip-flop 5. Therefore, since both input terminals J and K of the flip-flop 5 are at a high level, the output level of its output terminal Q is inverted. That is, one output terminal Q becomes a low level, and this is output to the controller 4.
Moreover, the other output terminal becomes high level. As a result, the transistor _Tr2 becomes conductive, and the light emitting diode LED2 emits light. This flipflop 5
Once the inversion occurs, the output level is latched and remains at the same level unless a reset signal is given from the controller 4. On the other hand, other falling objects that fell at the same time are detected by the detection units 2b to 2n arranged correspondingly, and each detection unit 2
Flip-flops b to 2n (not shown) each output a detection signal to the controller.
Once a falling object is detected in each of the detection sections 2a to 2n in this way, the output level of the flip-flops 5, 5, . . . of each of the detection sections 2a to 2n is latched in response to the passage of the falling object. Therefore, the controller 4 inputs the output signal from each flip-flop 5, 5, . . . at a convenient timing while the flip-flops 5, 5, . . . are latched. In addition, the light emitting diodes LED ₂ for monitoring falls will remain lit once a falling object has passed through the detection parts 2a to 2n, so by counting the number of light emitting diodes LED ₂ that are lit, you can check whether all of them have fallen. be able to. After a group of falling objects is detected, a reset pulse signal is input from the controller 4 to the flip-flops 5, 5, . Prepare for the passage of a group of falling objects.

As described above, according to the present invention, a plurality of detection units,
and a controller, each detection unit is provided individually corresponding to each of the plurality of falling objects falling as a group, and
Each consists of a detection sensor, a flip-flop, and a light emitting diode.
The passage of a falling object is detected, and a pulse output is generated and output in response to this detection, and the flip-flop latches the pulse output and outputs the pulse output as a detection signal. In response to the latch output of the controller, a lighting operation is performed to monitor falling objects, and the controller inputs the detection signals latched to the flip-flops of each of the detection sections at appropriate timing, and inputs the detection signals to each detection signal. After detecting a group of falling objects based on the detection of a group of falling objects, a reset pulse signal is output to each flip-flop at a predetermined timing to release the latch of the flip-flop. Even if the falling objects have different falling speeds, the controller inputs the detection signal latched to the flip-flop at a convenient timing, and calculates the required value for the last falling object in response to the input detection signal. For example, after the control of the sorting device for sorting out good and defective products is completed, a reset pulse signal can be given to each flip-flop to reset them.
It is possible to reliably detect individual falling objects that fall as a group even if their falling speeds are different, and in addition, there is sufficient time to detect the next group of falling objects. This means that you will be able to prepare accordingly.

Further, according to the present invention, a light emitting diode is provided, and the light emitting diode can be operated to turn on for monitoring falling objects in response to the latch output of the flip-flop. As a result, it will be possible to easily check whether all falling objects in a group have been detected and the necessary controls have been completed based on the lighting status of each detection unit, so that it can be used to respond to falling objects. This has the excellent effect of making it extremely easy for the administrator to manage the equipment, as necessary management, for example, preparations for the next group of falling objects, can be carried out.

[Brief explanation of drawings]

The drawing is a circuit diagram of a fall detection device showing an embodiment of the present invention. 1...Fall detection device, 3...Detection sensor, 4...
...Controller, 5...Flip-flop.

Claims (1)

[Claims for Utility Model Registration] It has a plurality of detection units 2a to 2n and a controller 4, and each of the detection units 2a to 2n detects each of the plurality of falling objects falling as a group. They are individually provided, and each has a detection sensor 3, a flip-flop 5, and a light emitting diode LED 2. The detection sensor 3 detects the passage of a falling object, and The flip-flop 5 latches the pulse output and outputs the pulse output as a detection signal, and also outputs the pulse output in response to the input of the reset pulse signal. The light emitting diode LED 2 is used to turn on the light to monitor falling objects in response to the latch output of the flip-flop 5, and the controller 4 controls each of the detection units 2a to 2n. After inputting the detection signals latched to the flip-flops 5 at appropriate timings and detecting a group of falling objects based on each detection signal, a reset pulse signal is output to each flip-flop 5 at a predetermined timing. It is something to do. A fall detection device characterized by: