JPS5841553B2 - Bouhan Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crime prevention device comprising a crime prevention switch circuit arranged in a security area and a central monitoring circuit that monitors the crime prevention switch circuit, and an object of the present invention is to facilitate security operation. To make it a more reliable security device,
Another object of the present invention is to provide a crime prevention device that automatically returns the crime prevention switch to the alarm state when a specific signal is given, thereby simplifying the operation and preventing the switch from going into the alarm state due to an operational error. .

Conventionally, crime prevention devices are well known in which a security switch is installed on the door bodies of windows, entrances, etc., and a detection signal from the security switch that is activated when any of the door bodies is opened is transmitted to a central monitoring room and notified. .

When such a security device is used as a security system for a large building, it is necessary to short-circuit the security switch on each door body to prevent the alarm from operating while the security guard is patrolling the security area. Making the security switch easily short-circuited is not only cumbersome to operate, but also disturbs the settings of the security circuit, which is not desirable in terms of crime prevention.
If the X is left as it is after a short circuit, a non-security area will be created.

The present invention has been made in view of the above-mentioned problems.

Embodiments of the security device of the present invention will be described below with reference to the drawings listed as examples.

In FIG. 1, A is a loop detection circuit, B is a monitoring circuit,
C is a central monitoring circuit, D is a power supply, and E is a signal inversion circuit.

Loop detection circuit A consists of security switch circuit A1 and reception circuit A.
2, the detection signal is input to the receiving circuit B1 of the monitoring circuit B, and combined with the selection signal of the switch circuit B2, such as a keyboard provided in the monitoring circuit B, to the receiving circuit B1.
The output is relayed to the central monitoring device C via the monitoring circuit B as a warning state release and setting signal.

The signal inverting circuit E is configured to invert after a certain period of time in response to the warning signal from the loop detection circuit A, outputting a warning setting signal, and resetting the receiving circuit B1 of the monitoring circuit H.

Next, to explain in detail in FIGS. 2 and 3, the security switch circuit A of the loop detection circuit A- is a switching type between the two lines 11 and 12 extending from the power source via the resistor R1 of the receiving circuit A2. Security switch S1. S2... and terminating resistor R2
Connect with.

In this case, each normally closed contact a of the security switches S, , S2... is connected in series to the line 11, and each normally open contact is connected to the line 11.
, 12, and the normally closed contacts a, a... and the terminating resistor R.
2 constitutes a series circuit on the lines 11 and 12 to form a receiving circuit A2.
It is connected to.

The receiving circuit A2 includes a transistor Tr1 that becomes conductive due to a warning current flowing from the power source through the series circuit;
From the power source, the resistors R, , R3 and the transistor T
The transistor Tr2 becomes conductive due to the base current flowing through r1, and the transistor Tr2 becomes conductive due to the conduction of the transistor Tr2.
It consists of a driving relay Ry1, and the relay contact r1 of the relay Ry1 serves as a contact output of the receiving circuit B1.

The switch circuit B2 of the monitoring circuit B includes a switch SS that outputs a selection signal based on a permuted combination of numbers by suppressing a plurality of push buttons and turns on a contact r2, and a switch SS that turns on a contact r2.
Relay Ry2 to be driven, its self-holding contact r3, and relay contact r4 of relay Ry4 provided in the signal inversion circuit E.
It becomes more.

The relay contact r5 of the relay Ry2 is input to the receiving circuit B1 and combined with the output of the loop detection circuit A.

That is, the receiving circuit B1 includes relay contacts r1, r5, and a resistor R.
A transistor Tr3 is made conductive by a current flowing from the power source through the power source, a transistor Tr4 is made conductive by a base current flowing from the power source through resistors R5 and R6 and the transistor Tr3, a relay RY3 is driven by the conduction of the transistor Tr4, and a transistor Tr4. The transmission line 13 extends from the collector of the central monitoring circuit C, and the relay contacts of the relay Ry3 drive a display circuit such as a light emitting diode.

The signal inverting circuit E drives the relay Ry by 1 after a certain period of time using a relay Ry4, a switching element PUT such as a programmable unijunction transistor, gate voltage dividing resistors R7 and R8, a resistor R9 connected to the anode side, and a capacitor C. The transistor Tr5 is connected to both ends of the capacitor C via a resistor R1o and is in a non-conducting state in the alert state, and the transistor Tr5 is connected between the base of the transistor Tr5 and the collector of the transistor 1'r2 of the detection circuit A2. The signal inverting circuit E and the loop detection circuit A are coupled by the transistor Tr6, which is in a conductive state in the alert state and connected to the circuit Tr6, and the loop detection circuit A is coupled to the switch circuit B2 by the loop contact r4 of the relay Ry4.

Next, the warning operation and automatic recovery operation of the present invention will be described.

In the state shown in FIG. 2, the loop detection circuit A is in an alert state, the transistor Tr2 is conductive, and the collector voltage is at a low potential.
Relay Ry4 connected to switching element PUT closes contact r4, relay Ry1 connected to transistor Tr2 switches relay contact r1 connected to receiving circuit B1 of monitoring circuit B to resistor R4 side, and closes contact r4 of transistor Tr2.
r3 and Tr4 are conductive, and the transmission line 13 connected to the collector of the transistor Tr4 sets a low potential level signal and transmits it to the central monitoring circuit C.

In the alert state, if the security switch S1 is activated by opening the door and is switched from the normally closed contact a to the normally open contact l], or if a disconnection or short circuit occurs between the two lines 11 and 12, the transistor Tr2 becomes non-conductive. Then, the relay Ry1 returns to its original state, and the relay contact r1 of the receiving circuit B1 is opened by the resistor R4. Tr4 is made non-conductive.

That is, the transistor T of the loop detection circuit A and the monitoring circuit B
The collector voltages of r2 and Tr4 both output signals at high potential levels.

Therefore, in the signal inversion circuit E, the transistor Tr6 is non-conductive, and the 1-range disk Tr5 is made conductive to discharge the charge in the capacitor C.

In the monitoring circuit B, a high potential level abnormal signal is transmitted to the central monitoring circuit C from the transmission line 13.

In the alert state, in order to check the alert area, by operating switches S and S of switch circuit B2 and giving a specific selection signal, when contact r2 closes, relay R is activated.
V2 is driven, and the relay contact r5 of the receiving circuit B1 is connected to the resistor R.
Switch to the 4 side, and at the same time relay Ry by relay contact r3.
2 is self-retained.

Therefore, regardless of the relay contact r1 of the loop detection circuit A, the receiving circuit B1 of the monitoring circuit B
The collector of r4 outputs a signal at a low potential level, and the alarm is released, allowing the door to be opened without issuing an abnormal signal.

Next, when the door body is closed, the detection circuit A of the loop detection circuit A
2, the collector output of the transistor Tr2 becomes a low potential level, the transistor Tr6 becomes conductive, the transistor Tr5 becomes non-conductive, and the capacitor C charged through the resistor R0 rises by one level above the gate potential of the switching element PUT after a certain period of time. At this time, relay RV4 is instantaneously driven to 1, and during that time, relay contact r4 connected to switch circuit B2 is opened, relay Ry2 is driven, and relay contacts r and 3 are restored, automatically returning to their original state. This will return the vehicle to a state of alert.

As described above, according to the security device of the present invention, the security switch circuit A1, the operation of the security switch circuit A1, and the line 11
, 12 connections and short circuits, and a selection signal of a switch circuit B2 that releases or sets the alert state of the loop detection circuit A, the receiving circuit of the monitoring circuit B By manually setting the level in B1 and transmitting the output signal to the central monitoring circuit C using the monitoring circuit B as a relay, there is no need to modify the loop monitoring circuit A- to cause a short circuit. The relay monitoring circuit B can reliably issue a warning release signal,
The operation can be canceled by giving the specified selection signal.
The setting operation is easy, and can be operated from inside or outside the room that is the warning area, and if a signal reversal circuit E is provided, even if you forget to return to the warning state after canceling the warning,
Since it automatically returns to the alert state, a reliable crime prevention device that is reliable and safe to operate can be obtained.

[Brief explanation of the drawing]

The figures show an embodiment of the security device of the present invention, with FIG. 1 being a block diagram, FIG. 2 being an electric circuit diagram of a loop detection circuit and a signal inverting circuit, and FIG. 3 being an electric circuit diagram of a monitoring circuit. A...Loop detection circuit, B...Monitoring circuit, C...
Central monitoring circuit, D...power supply, E...signal inversion circuit,
A-1... Security switch circuit, A2... Receiving circuit,
B1...reception circuit, B2...switch circuit, 11,
12... Line, 13... Transmission line, Sl, B2...
Security switch, a... normally closed contact, b... normally open contact,
SS...Switch, Ryl, Ry2. Ry3. Ry4...Relay, T r , T r2
, T r3T r4 , T r5 , T r6・+
・h transistor, R1, R2゜R3t R4J R5J
R6t R7t R8J RoJ RIO”'Resistance,
rl, '2 t r3 Hr4, r5'' Relay contact, PUT... switching element, C... capacitor.

Claims (1)

[Scope of Claims] 1. A detection signal of a loop detection circuit consisting of a crime prevention switch circuit, an operation of the crime prevention switch circuit, and a detection circuit for detecting line breakage and short circuit, and canceling and setting the alarm state of the loop detection circuit. A crime prevention device characterized in that a selection signal of a switch circuit is inputted to a receiving circuit of a monitoring circuit to set a level, and the output signal is transmitted to a central monitoring circuit using the monitoring circuit as a relay. 2. A detection signal of a loop detection circuit consisting of a crime prevention switch circuit, an operation of the crime prevention switch circuit, and a detection circuit that detects disconnection or short circuit of the line, and a selection signal of the switch circuit that releases or sets the alarm state of the loop detection circuit. is input to the receiving circuit of the monitoring circuit to set the level, and the output signal is transmitted to the central monitoring circuit using the monitoring circuit as a relay, and is inverted after a certain period of time by the return signal of the loop detection circuit. A crime prevention device characterized by being provided with a signal reversal circuit that outputs a warning setting signal.