JP2582744B2 - Circuit for driving the sorting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects a target product or a series of products from a group of products to be transported by a detection device and sorts the products by a separation device. The present invention relates to a circuit that outputs a signal.

[0002]

2. Description of the Related Art A conventional example of the above-described circuit will be described below with reference to FIGS. As shown in FIG. 5, the detection device (7) is a line sensor camera (7).
a) and a judgment processing circuit (7b) connected thereto, the sorting device (9) comprises a box (9c) having a slit (9a) facing the falling path of the target product (10); A shutter (9b) is provided in the body (9c) and swings in the directions indicated by arrows X to close and open the slit (9a), and the inside of the box (9c) is appropriately sucked. I have.
The input of the drive signal output circuit (8) is connected to the output of the determination processing circuit (7b), and the input of the selection device (9) is connected to the output of the drive signal output circuit (8). ing.

[0003] Thus, the detection device (7) scans the target product (10) passing through the imaging point P with the line sensor camera (7).
a), and the imaged data is determined by the determination processing circuit (7).
b) to detect whether there is a target product to be sorted. Then, the drive signal output circuit (8) receives the above-mentioned signal from the determination processing circuit (7b),
A drive signal output by the time t ₂ after elapse. Sorting device (9), upon entering this signal, swung only shutter (9b) wherein t ₂ in the arrowed × direction, the slit (9a)
The product to be sorted that has fallen to the front of is suctioned out.
The time t ₁ is a time required for the product to fall from the imaging point P by a distance H to the front surface of the slit (9 a).

Conventionally, the drive signal output circuit (8) shown in FIG. 6 is known. As shown in the figure, this circuit has two monostable multivibrators (12) and (13) connected in series. According to this circuit, as shown in FIG. 7, first, the monostable multivibrator (12) receives the detection signal A as a trigger pulse and outputs a pulse signal B of time t ₁ (pulse width). Then, the monostable multivibrator (13) outputs a pulse signal C of time t ₂ (pulse width) as a drive signal, triggered by the end of the pulse signal B.

[0005]

However, the conventional circuit described above has the following problems.

That is, the monostable multivibrator (1)
If both 2) and (13) cannot be retriggered,
As shown in FIG. 8, if the time T from the input of the first detection signal A to the input of the second detection signal A is t ₁ ≦ T ≦ t ₂ (shown by a solid line in FIG. 8), the second. Is not output, and if T ≦ t ₁ (shown by a broken line in FIG. 8), the pulse signal C is not output as a result of not outputting the pulse signal B, and the second detection signal A It is not possible to select the product that is the source of the selection.

On the other hand, the monostable multivibrator (1)
Assuming that 2) can be retriggered, T is t ₁ ≦ T ≦ t
If it is _2, as shown in FIG. 9, as a result of the pulse width of the pulse signal C is extended, it can be selected sorting products, in the case of T ≦ t _1, as shown in FIG. 10 As a result, the pulse signal C corresponding to the second detection signal A is not output, so that the pulse signal C is not output and the monostable multivibrator (12) can be retriggered (FIG. 1).
It is indicated by a broken line at 0. ), The pulse signal C corresponding to the first detection signal A is not output, which is inconvenient.

As described above, according to the conventional circuit, it is inconvenient whether the monostable multivibrators (12) and (13) cannot be retriggered or can be retriggered. An object of the present invention is to solve the problem and to provide a drive signal output circuit that can select a product to be sorted regardless of the length of the interval between detection signals.

[0009]

SUMMARY OF THE INVENTION The present invention for solving the above-mentioned problems is to detect a target product or a series of products from a group of products to be properly transferred by a detecting device, and to detect this by a sorting device. At the time of sorting, the drive signal C
A first monostable multivibrator having an input terminal connected to the detection device, capable of retrigger, inputting a trigger pulse, and outputting a pulse signal D for a time t _1. , One input terminal is connected to the detection device, and the other input terminal is connected to an output terminal of the first monostable multivibrator via a first inverter, and an ON signal is input to both input terminals. A first gate circuit that outputs a detection signal F, and an input terminal is connected to an output terminal of the first gate circuit, and the detection signal F from the first gate circuit is input as a trigger pulse and time a second monostable multivibrator for outputting the t ₂ only pulse signal B, and one input terminal connected to an output terminal of said via a second inverter second monostable multivibrator, The other input terminal is connected to the output terminal of the first monostable multivibrator, and a second gate circuit that receives an ON signal and outputs a drive signal C to both input terminals. I do.

[0010]

Next, the details of the present invention will be described based on examples. FIG. 1 is a circuit diagram showing one embodiment of the present invention, and FIG.
4 to 4 are explanatory diagrams showing input and output signals of each section of the circuit.

As shown in FIG. 1, the sorting device driving circuit (8) of the embodiment comprises a first retriggerable monostable multivibrator (1) and a second retriggerable monostable multivibrator. It comprises a vibrator (4), a first gate circuit (3) and a second gate circuit (6) which are AND circuits, a first inverter (2), and a second inverter (5). is there.

The input side of the first monostable multivibrator (1) and one input side of the first gate circuit (3) are connected to the output side of the decision processing circuit (7b) in FIG. Connecting the output side of the first monostable multivibrator (1) to the input side of the first inverter (2), and connecting the output side of the first inverter (2) to the first gate circuit (3). Is connected to the other input side. Also, the input side of the second monostable multivibrator (4) is connected to the output side of the first gate circuit (3), and the output side is connected to the input side of the second inverter (5). The output side of the second inverter (5) is connected to one input side of a second gate circuit (6), and the output side of the first monostable multivibrator (1) is connected to a second gate circuit (6). And the output side of the second gate circuit (6) is connected to the sorting device (9) in FIG.

Thus, the detection signal A is input from the determination processing circuit (7b) to the first gate circuit (3) and the first monostable multivibrator (1). When the detection signal A is input, the first monostable multivibrator (1) supplies the first inverter (2) and the second gate circuit (6) with a pulse width (t ₁ + t ₂ ) (time). The pulse signal D is output. The first inverter (2) turns off the output only when the pulse signal D is input. Therefore, an ON signal is always input to the other input side of the first gate circuit (3), and when the detection signal A is input, the first gate circuit (3) outputs an ON signal. On the other hand, the detection signal A is also input to the first monostable multivibrator (1), and the ON signal output from the first inverter (2) is output to the first gate circuit (3). Since the signal is turned off after a lapse of a minute time from the input, the output pulse signal F is as shown in FIG.

Next, the second monostable multivibrator (4) uses the pulse signal F as a trigger to generate a pulse width t.
_{The 1} (time) pulse signal B is output to the second inverter (5). And the second inverter (5) are always output an ON signal, but OFF while, i.e., an ON signal only pulse width t ₁ of the pulse signal B is inputted. Thus, the when the other pulse signal D to the input side is input inputted to substantially simultaneously said one input is OFF for a time t _1, the second gate circuit of the second gate circuit (6) (6) outputs a pulse signal C of the pulse width t ₂ from the output side. Therefore, this sorting device driving circuit (8)
During a time after a time by receiving a detection signal A t ₁ t ₂ drive signal C
Is output.

Next, the interval T between the input of the first detection signal A and the input of the second detection signal A, which was a problem in the prior art,
Where t ₁ ≦ T ≦ t ₁ + t ₂ and T ≦ t ₁ are described.

(1) When t ₁ ≦ T ≦ t ₁ + t _{2 As} shown in FIG. 3, the first monostable multivibrator (1) receives the first detection signal A and receives the pulse width (t _1).
+ T ₂ ), but can be retriggered. Therefore, when the second detection signal A is input after a time T from the input of the first detection signal A, the pulse signal D becomes The width is extended from that time by (t ₁ + t ₂ ). On the other hand, the first gate circuit (3) outputs the first detection signal A
Is input, a pulse signal F is output. However, even if the second detection signal A is input, the ON signal is not output from the first inverter (2), so that the pulse corresponding to the second detection signal A is output. Does not output signal F. Then, a second monostable multivibrator (4), the pulse signal F is input and outputs a pulse signal B of the pulse width t _1, the second inverter (5) is inputted pulse signal B and OFF the output only time t _1. Thus, the second gate circuit (6) is input the first detection signal A, and outputs an ON signal to the time t ₁ after the lapse, the second detection signal A time from the input (t ₁ + t ₂ ) Turns off after the lapse. Therefore, even if the time T is t ₁ ≦ T ≦ t ₁ + t ₂ , the output of the drive signal C corresponding to the second detection signal A is secured, and the driving signal C is the cause of the first and second detection signals A. It is possible to sort each product.

(2) When T ≦ t _{1 As} shown in FIG. 4, the first monostable multivibrator (1) receives the first detection signal A and outputs the pulse signal D, but can be retriggered. Therefore, the pulse width is extended by the time (t ₁ + t ₂ ) from the input of the second detection signal A after the time T. On the other hand, the first gate circuit (3) outputs the pulse signal F when the first detection signal A is input, but turns on from the first inverter (2) even when the second detection signal A is input. Since no signal is output, the pulse signal F corresponding to the second detection signal A is not output. Next, when the pulse signal F is input, the second monostable multivibrator (4) has a pulse width t.
Outputs _one of the pulse signal B, a second inverter (5) is inputted pulse signal B, OFF output by a time t ₁
I do. Thus, the second gate circuit (6), the first detection signal A input to the time t ₁ has elapsed after the pulse width (T + t
₂ ) The pulse signal D is output. Thus, the time T is T
≦ t ₁ , the output of the drive signal C corresponding to the second detection signal A is secured, and the first and second detection signals A
It is possible to sort out each product that caused this.

[0018]

As described above in detail, according to the present invention, even if a detection signal for a product to be sorted is input a plurality of times in a very short time, a drive capable of responding to all the detection signals is provided. Since a signal can be obtained, products to be sorted can be reliably sorted.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a selection device driving circuit according to an embodiment of the present invention.

FIG. 2 is a time chart showing a case where T> t ₁ + t ₂ in the embodiment of FIG. 1;

FIG. 3 is a time chart showing a case where t ₁ <T ≦ t ₁ + t ₂ in the embodiment of FIG. 1;

FIG. 4 is a time chart showing a case where T ≦ t ₁ in the embodiment of FIG. 1;

FIG. 5 is an explanatory view showing an entire conventional sorting apparatus.

FIG. 6 is a block diagram showing a conventional selection device driving circuit.

FIG. 7 is a time chart in the conventional example of FIG.

8 is a time chart showing a case where T ≦ t ₂ in the conventional example of FIG. 6;

9 is a time chart showing a case where T> t ₁ in the conventional example of FIG. 6;

FIG. 10 is a time chart showing a case where T ≦ t ₁ in the conventional example of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st monostable multivibrator 2 1st inverter 3 1st gate circuit 4 2nd monostable multivibrator 5 2nd inverter 6 2nd gate circuit 7 Detector 8 Drive signal output circuit 9 Sorting device 10 Granular material 11 Defective product 12, 13 Monostable multivibrator

Claims (1)

(57) [Claims] 1. A circuit for detecting a target product or a series of products from a group of products to be transferred as appropriate by a detection device and outputting a drive signal C to the selection device when selecting the product by the selection device. (A) a first monostable multivibrator having an input terminal connected to the detection device, capable of retrigger, and receiving a trigger pulse and outputting a pulse signal D for a time t ₁ ; (B) one input terminal is connected to the detection device;
A first gate circuit having the other input terminal connected to an output terminal of the first monostable multivibrator via a first inverter, an ON signal being input to both input terminals and outputting a detection signal F; (C) an input terminal connected to the output terminal of the first gate circuit, a detection signal F from the first gate circuit being input as a trigger pulse, and a _second pulse signal B being output for a time t2. (D) one input terminal is connected to the output terminal of the second monostable multivibrator via a second inverter, and the other input terminal is connected to the first monostable multivibrator. A second gate circuit connected to the output terminal of the vibrator and receiving an ON signal at both input terminals and outputting a drive signal C.