JPH0218232Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic door detector having a function of detecting the direction of passing objects such as people and vehicles.

Conventionally, as this type of detector, for example, the
There is one described in Japanese Patent No. 13594, which will be explained based on FIGS. 1 to 4.

In this conventional detector, the first switch S1 forms a first detection area A1 just in front of the door D, and the second switch S2 forms a second detection area A2 on the opposite side of the door side of the first detection area A1. are doing. A first relay R1 is connected in series to the first switch S1, a normally closed contact R1B of the first relay R1, a second switch S2, and an off-delay type second relay R2 are connected in series. Normally open contact R1A and normally open contact R2A of second relay R2 and output relay R
0 are connected in series. Note that the contact R0B in FIG. 3 is a normally closed contact of the output relay, and when this normally closed contact R0B opens, the door D opens.

The operation of the detector when a passing object N passes in the direction of arrow X in FIG. 1 will be explained based on the time chart of FIG. 4a. The contact points of each switch and each relay in the normal state are as shown in Fig. 3. In this normal state, when a passing object N enters the second detection area A2, the second switch S
2 senses this and closes, and the second relay R2 is energized and closes its normally open contact R2A. When the object N moves toward the door D and leaves the second detection area A2, the second switch S2 opens, but the second relay R
Since 2 is an off-delay timer, the normally open contact R2A remains closed for a preset delay time T. When the object N enters the first detection area A1, the first switch S1 detects this and closes, and the first relay R1 is energized to open its normally closed contact R1B and close its normally open contact R1A. Therefore, the output relay R0 is energized by the closing of normally open contacts R2A and R1A, and its normally closed contact R0B is energized.
In other words, this detector outputs a door open signal.

Further, when a passing object passes in the direction of arrow Y in FIG. 1, which is opposite to the above-mentioned passing direction, this detector operates as shown in the time chart in FIG. 4b. When a passing object N enters the first detection area A1, the first switch S1 detects this and closes, and the first relay R1 is energized to open its normally closed contact R1B and close its normally open contact R1A. When the second switch S2 is open, the normally open contact R2A is open. When the passing body N leaves the first detection area A1, the first switch S
1 opens, and the first relay R1 is demagnetized, closing its normally closed contact R1B and opening its normally open contact R1A. When the object N enters the second detection area A2, the second switch S2 detects this and closes, and the second relay R2 is energized and its normally open contact R
Close 2A. However, at this time, the normally open contact R1A
Since the output relay R0 is open, the output relay R0 is not energized and its normally closed contact R0B remains closed, ie, no door open signal is output.

As mentioned above, the conventional detector has a function of detecting the passing direction of a passing object.

However, as shown in Figure 2, the traffic body N
passes through the second detection area A2 from the direction of arrow X, stops at the first detection area A1, and then passes through the second detection area A
If the object N remains stopped even after the delay time T has elapsed after leaving the door, the detector outputs a door close signal instead of a door open signal, that is, it malfunctions. This will be explained based on the time chart shown in FIG. 4c.

When the passerby N enters the second detection area A2,
Second switch S2 senses this and closes, energizing second relay R2 and closing its normally open contact R2A. When the passing object N leaves the second detection area A2, the second switch S2 opens, but the second relay R2
Since is an off-delay timer, the normally open contact R2A remains closed for the delay time T. Passage body N
enters the first detection area A1, the first switch S1 detects this and closes, and the first relay R1 is energized to open its normally closed contact R1B and close its normally open contact R1A. These normally open contacts R2A, R
1A is closed, output relay R0 is energized and outputs a door open signal. At this time, traffic body N stopped and the second
When the delay time T has elapsed after leaving the detection area A2, the first switch S1 closes and even if the normally open contact R1A of the first relay R1 remains closed, the normally open contact R2A of the second relay R2 opens. , output relay R0 is demagnetized and its normally closed contact R0B closes to output a door close signal (malfunction).

At this time, if the passing object N is in the position shown in Figure 2, the door D in the closing operation will collide with the passing object N, and the passing object N will stop at a position slightly to the right of the position shown in Fig. 2. ,
Even if you start moving toward door D after door D is closed, door D will not open, and in order to open door D, you need to move to the second detection area A2.
After going back once to the second detection area A2
The vehicle must pass from the point to the first detection area A1.

Therefore, the technical problem of the present invention is to prevent malfunctions in the conventional automatic door detector described above.

The technical means of the present invention for solving this technical problem is that in the above-mentioned conventional automatic door detector, when a passerby passes from the second detection area to the first detection area, the passerby receives a door open signal. This is because a self-holding circuit is provided that holds the sensor until it leaves the first detection area.

According to the present invention having this technical means, even if a passing object passes from the second detection area to the first detection area and stops in the first detection area for a long time, and there is no signal due to passing through the second detection area, The door open signal once output can be held until the passing object leaves the first detection area by the operation of the self-holding circuit. Therefore, the door will not close even though there is a passing object in the first detection area.

Embodiments of the present invention shown in FIGS. 5 to 10 will be described below.

FIG. 5 shows a first embodiment of the automatic door detector of the present invention constructed from a relay circuit, and FIG. 6 is a time chart showing the operation of each switch and each contact in the same embodiment.

5 differs from FIG. 3 in that the normally open contact R0A of the output relay R0 is connected in parallel to the normally open contact R2A of the second relay R2 to form a self-holding circuit. The same reference numerals as those in FIG. 3 are given, and the explanation thereof will be omitted.

In the normal state shown in FIG. 5, when a passing object N enters the second detection area A2 from the direction of the arrow X in FIG. 1, the second switch S2 detects this and closes, and the second relay R2 is energized. Its normally open contact R
Close 2A. When the object N moves toward the door D and leaves the second detection area A2, the second switch S2 opens, but since the second relay R2 is an off-delay timer, the normally open contact R2A is set in advance. It remains closed for a delay time T. Then, when the passerby N enters the first detection area A1, the first
Switch S1 detects this and closes, energizing first relay R1 to open its normally closed contact R1B and close its normally open contact R1A. Therefore, normally open contact R
2A and R1A are closed, output relay R0 is energized and its normally closed contact R0B is opened, and its normally open contact R
0A is closed, that is, this detector outputs a door open signal. Then, as shown in FIG. 6a, by the time the second switch S2 is opened and the delay time T has elapsed, the passerby N has left the first detection area A1 and the first switch S2 has opened.
1 opens, output relay R0 is demagnetized, its normally open contact R0A opens, and its normally closed contact R0B closes.
Outputs door close signal.

In addition, as shown in FIG. 6c, the second switch S
If the object N remains stopped in the first detection area A1 even after the delay time T has elapsed after the contact R2A opens, the normally open contact R2A opens halfway, but the normally open contacts R0A and R1
Since A remains closed, the door open signal is held, and when the object N leaves the first detection area A1, the first switch S1 opens, the first relay R1 is demagnetized, and its normally open contact R1A opens. The output relay R0 is demagnetized, opens its normally open contact R0A, closes its normally closed contact R0B, and outputs a door close signal.

In other words, the detector shown in FIG.
When passing from the detection area A2 to the first detection area A1 and once outputting the door open signal, the first detection area A
The door open signal is held as long as there is a passing object N at 1.

Furthermore, in the opposite direction to the above-mentioned passing direction, arrow Y in FIG.
If a vehicle passes in the direction, this detector will
It operates as shown in the time chart in Figure b. Passage body N
enters the first detection area A1, the first switch S1 detects this and closes, and the first relay R1 is energized to open its normally closed contact R1B and close its normally open contact R1A. Switch S2
is open and the normally open contact R2A is open. When the object N leaves the first detection area A1, the first switch S1 opens, and the first relay R1 is demagnetized, closing its normally closed contact R1B and opening its normally open contact R1A. When the object N enters the second detection area A2, the second switch S2 detects this and closes, and the second relay R2 is energized and its normally open contact R
Close 2A. However, at this time, the normally open contact R1A
Since the output relay R0 is open, the output relay R0 is not excited, its normally closed contact R0B is closed, and its normally open contact R0A remains open, that is, no door open signal is output.

FIG. 7 shows a second embodiment of the automatic door detector of the present invention constructed from a logic circuit. In Figure 7, S
1 is a first switch that forms a first detection area A1 shown in FIG. 1 and detects the presence of a passing body in the first detection area A1; This is a second switch that detects passing objects in the detection area A2. The first switch S1 is connected to one input terminal of the first AND circuit AN1 via a NOT circuit NOT, and
It is connected to one input terminal of the second AND circuit AN2. A second switch S2 is connected to the other input terminal of the first AND circuit AN1, and the second switch S2 is connected to the other input terminal of the first AND circuit AN1.
The output terminal of AN1 is an off-delay type delay timer T.
It is connected to one input end of the OR circuit through the OR circuit. The output end of the OR circuit is the second AND circuit
It is connected to the other input end of the second AND circuit AN2, and the output end of the second AND circuit AN2 is connected to the other input end of the OR circuit OR to form a self-holding circuit.

The operation of this embodiment is shown in a time chart in FIG. 8, and detailed explanation thereof will be omitted.

FIG. 9 shows a third embodiment of the automatic door detector of the present invention, which is different from the second embodiment shown in FIG.
The OR circuit OR which feeds back the output of the AND circuit AN2 is arranged between the second switch S2 and the first AND circuit AN1 to form a self-holding circuit, and between the first switch S1 and the NOT circuit NOT. The following points are that an off-delay type first delay timer T1 is arranged, and an off-delay type second delay timer T2 is arranged between the first AND circuit AN1 and the second AND circuit AN2, and other detailed explanations will be omitted. .

Furthermore, FIG. 10 shows a fourth embodiment of the automatic door detector of the present invention, which is different from the third embodiment shown in FIG. 1st AND circuit AN1
This point is that a self-holding circuit is formed between the second delay timer T2 and the second delay timer T2, and other detailed explanations will be omitted.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of the detection area of a conventional automatic door detector, Figure 3 is a relay circuit diagram of the same detector, Figure 4 is a time chart of the relay circuit in Figure 3, and Figure 5. 6 is a time chart of the first embodiment of the automatic door detector of the present invention, FIG. 7 is a time chart of the second embodiment, and FIG. 8 is a time chart of the second embodiment. , FIG. 9 shows the third embodiment, and FIG. 10 shows the fourth embodiment. D... Door, A1... First detection area, A2...
Second detection area, N...passing object.

Claims (1)

[Scope of utility model registration request] A first detection area is formed just before the door, a second detection area is formed on the opposite side of the door to the first detection area, and the door is activated only when a passing object passes from the second detection area to the first detection area. In an automatic door detector that outputs an open signal, when the door open signal is detected by a passerby,
An automatic door detector equipped with a self-holding circuit that holds the door until it leaves the detection area.