JP3035476B2 - District sound system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a district sound apparatus having a polarity selection circuit for switching from non-polarity to polarity.

[0002]

2. Description of the Related Art Conventionally, there is a circuit as shown in FIG. In FIG. 5, 1
Denotes a fire receiver or a repeater. A transistor 4 having a relay 3 connected to a collector to which a voltage of, for example, 24 V is applied from a terminal 2 is provided in the fire receiver or the repeater 1.
For example, a voltage of 24 V is supplied from the terminal 5 through the fuse 6, and a relay contact piece 8 that closes the relay contact 7 when the relay 3 is activated by turning on the transistor 4 by input of an activation signal. A control line 11 is connected between a terminal 9 connected to the relay contact 7 and a terminal 10 connected to the ground, and a local acoustic device 12 composed of a plurality of bells or buzzers is connected to the control line 11. .

In some cases, the local acoustic device 12 is connected via a non-polar circuit in order to eliminate a mistake in connection with the control line 11. In this case, the workability for installing the district acoustic device 12 can be improved, but the disconnection of the control line 11 cannot be detected. Next, FIG. 6 shows an example of a circuit having a disconnection detection function of a control line.

In FIG. 6, reference numeral 21 denotes a fire receiver or a repeater, and a terminal 22 is connected to the fire receiver or the repeater 21.
For example, the relay 23 is connected to a collector to which a voltage of 24 V is supplied, and is turned on by input of an operation signal to turn on the relay 23.
Is provided. When the relay 23 is activated, the fire receiver or the relay 21 is provided with relay contacts l1 and l2 which are switched from the relay contacts a and a1 to the relay contacts b and b1, respectively. A disconnection detection circuit 27 is provided between the supply terminal 25 and the supply terminal 25 via a fuse 26.

The relay contact b is connected to a terminal 25 via a fuse 26, and the relay contact a is connected to an intermediate point 28 between the contact b1 connected to the ground and the ground. Terminals 29 and 30 connected to relay contacts l1 and l2
Between them, a control line 31 is connected, and a diode 32A,
Regional sound device 33 consisting of 32B and bell or buzzer
A and 33B are connected in series, and a series circuit in which A and 33B are connected in series, respectively, and a terminating resistor 34 is connected to the terminating end.
The cathodes of the diodes 32A and 32B are connected to the local acoustic devices 33A and 33B.

When no operation signal is input, the transistor 24 is off and the relay 23 does not operate. For this reason, the relay contact pieces l1 and l2 are connected to the relay contacts a and a1. Therefore, the current from the terminal 25 is supplied to the fuse 26, the disconnection detection circuit 27, the contact point a1, and the contact piece l.
2. Terminal 30, terminal resistor 34, terminal 29, contact piece 11, contact a, and flow to ground,
A, 32B and the local sound devices 33A, 33B do not flow. If the control line 31 is disconnected, the disconnection detection circuit 27 performs disconnection detection. On the other hand, when an operation signal is input to the transistor 24 due to the occurrence of a fire, the transistor 24 is turned on and the relay 23 operates. When the relay 23 is operated to switch the relay contacts l1 and l2 from the relay contacts a and a1 to the relay contacts b and b1, the current from the terminal 25 is supplied to the fuse 26, the contact b and the contact l.
1, flows through the terminal 29, the diodes 32A and 32B, the district acoustic devices 33A and 33B, the contact 30, the contact piece 12 and the contact b1 to the ground, and the district acoustic devices 33A and 33B are driven and sound.

As described above, in order to detect the disconnection of the control line, the local acoustic devices 33A and 33B are connected to the diode 32.
A, 32B, and thereby polarized.

[0008]

However, when the circuit for connecting such a conventional district sound device is depolarized as shown in FIG. 5, the connection work is eliminated and the work for attaching the district sound device is performed. Although the workability can be improved, there is a problem that it cannot be applied to a fire receiver having a function of detecting a disconnection of a control line.

The present invention has been made in view of such a conventional problem, and in consideration of workability, a district sound device is connected in a non-polar manner to provide a disconnection detection function. It is an object of the present invention to provide a polarity selection circuit and a district sound device that can be switched to a polarity at the site when applied to a fire receiver having the same.

[0010]

In order to achieve this object, the present invention is configured as follows. The present invention provides a pair of input units to which a drive voltage is input, a pair of connection units connected via a jumper wire, a buzzer, a pair of output units for connecting audio equipment such as a bell, and a pair of input units. A polarity selection circuit that forms a non-polar circuit when a jumper wire is connected between the connection portion and the pair of output portions and is switched to a polar circuit when the jumper wire is disconnected. And

Further, the present invention comprises a printed circuit board on which a polarity selection circuit is mounted, and a main body for housing the printed circuit board.
A plurality of slits are formed in the main body, and a lead wire connected to a pair of input portions provided on the printed board is fitted into the slit, and a jumper wire connected to the pair of connection portions provided on the printed board is inserted between the slits. It is characterized by being drawn out. Here, a diode bridge circuit is used as the polarity selection circuit.

As described above, since the audio equipment such as the buzzer or the bell is connected via the non-polar circuit, the workability is excellent and the polarization can be easily achieved.
The present invention can be applied to a fire receiver having a disconnection detection function. In addition, since the jumper wire is drawn out between the slits formed in the audio device main body, the polarization can be easily achieved on site simply by cutting the jumper wire.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a polarity selection circuit of a district sound apparatus according to the present invention. In FIG. 1, 41, 42
And 43, a pair of input sections to which a drive voltage supplied from a fire receiver or a repeater (not shown) via a control line is input.
44 is a pair of output sections, 43 is a plus output section, 44
Is a minus output section. Between the positive output unit 43 and the negative output unit 44, a buzzer or bell 4 as an audio device is provided.
5 is connected. When a buzzer is connected, the buzzer is connected via a drive circuit.

A first diode 46 is connected between the input section 41 and the plus output section 43, and the first diode 46
Is connected to the plus output section 43 and the anode side to the input section 41. A second diode 47 is connected between the input section 42 and the minus output section 44. The cathode side of the second diode 47 is connected to the input section 42 and the anode side is connected to the minus output section 44.

The input section 41 and the first diode 46
A third diode 48 is connected between an intermediate point 50 with the anode side of the third diode 48 and an intermediate point 51 between the minus output portion 44 and the anode side of the second diode 47, and the cathode side of the third diode 48 The third diode 48 is connected to the input unit 41 and the anode side of the first diode 46.
Is connected to the negative output unit 44 and the anode side of the second diode 47.

A fourth diode is provided between an intermediate point 52 between the cathode side of the first diode 46 and the plus output section 43 and an intermediate point 53 between the input section 42 and the cathode side of the second diode 47. A jumper wire provided between the first diode 49 and the pair of connecting portions 55 and 56 is connected to each other. The cathode side of the fourth diode 49 is connected to the positive output portion 43 and the cathode side of the first diode 46. The connection side 55, the jumper wire 54, the anode side of the diode 49,
The input section 42 and the second diode 47 are connected via the connection section 56.
Is connected to the cathode side.

The first to fourth diodes 46 to 49 operate as a non-polar circuit when the jumper wire 54 is connected, and operate as a polar circuit when the jumper wire 54 is disconnected. Is composed. Next, an operation when the jumper wire 54 is connected between the connection portions 55 and 56 will be described.

A drive voltage supplied between the input units 41 and 42 via a control line is applied by setting the input unit 41 as a plus input unit and the input unit 42 as a minus input unit. The current from the input unit 41 is supplied to the first diode 46 and the positive output unit 4.
3, buzzer or bell 45, minus output section 44, second
Through the diode 47 to the input section 42 to drive the buzzer or bell 45 to sound. The current from the input unit 41 is blocked by the third diode 48 and does not flow to the input unit 42 side.

Also, the first diode 4
The current passing through 6 is blocked by the fourth diode 49 and does not flow to the input section 42 side. Next, the input polarity is inverted, and a drive voltage is applied between the input units 42 and 41 with the input unit 42 as a positive input unit and the input unit 41 as a negative input unit. The current from the input section 42 passes through a connection section 56, a jumper wire 54, a connection section 55, a fourth diode 49, a plus output section 43, a buzzer or bell 45, a minus output section 44, and a third diode 48. It flows to 41 to drive and sound a buzzer or bell. Input unit 42
Is blocked by the second diode 47,
It does not flow to the input unit 41 side. Further, the current from the input section 42 through the connection section 56, the jumper wire 54, the connection section 55, and the fourth diode 49 is blocked by the first diode 46, so that the current flows directly to the input section 41 side. Absent.

As described above, when the jumper wire 54 is connected, the diode bridge circuit 57 operates as a non-polar circuit, and is excellent in workability. Next, an operation when the jumper wire 54 is cut will be described. When this circuit is applied to a fire receiver or the like having a disconnection detection function of a control line, the jumper wire 54 is first disconnected before connection, and the circuit is switched to a polar circuit.

A control line is connected with the input section 41 as a plus input section and the input section 42 as a minus input section.
A drive voltage is applied between 1 and 42. The current from the input section 41 flows to the input section 42 through the first diode 46, the plus output section 43, the buzzer or bell 45, the minus output section 44, and the second diode 47, and the buzzer or bell 4
5 is driven to sound.

On the other hand, in order to detect a disconnection on the receiver side, the polarity is inverted so that a disconnection detection circuit is used. The input section 42 is a positive input section and the input section 41 is a negative input section. When the driving voltage is applied between the input unit 4 and the input unit 4 because the jumper wire 54 is disconnected.
The current from 2 does not flow to the plus output unit 43 side, and the buzzer or the bell 45 cannot be sounded. By cutting the jumper wire 54 at the site in this way, the circuit can be switched from a non-polar circuit to a polar circuit, and this circuit can be applied to a fire receiver having a disconnection detection function.

In the polarity selection circuit, when the non-polarity circuit is used, excellent workability can be maintained, and the circuit can be easily switched to a polar circuit on site to apply to a fire receiver having a disconnection detection function. it can. Next, FIG. 2 is a cross-sectional view of a disaster prevention equipment housing box provided with a district sound device equipped with the polarity selection circuit.

In FIG. 2, reference numeral 60 denotes a box which is mounted on a wall made of a metal plate having a terminal block 62 mounted on an upper portion of a bottom wall 61.
3. The main body plate 66 to which the district sound device 64 and the transmitter 65 are detachably attached is fixed by screws. The door 67 is attached to the main body plate 66 by engaging a not-shown claw provided at the lower end of the door 67 with an engagement hole (not shown) formed at the lower part of the main body plate 66 and screwing the upper part of the door 67 with screws. . A glove base 68 is integrally attached to an upper portion of the door 67, and a glove 69 is attached to the glove base 68. The transmitter 65 is exposed in a transmitter display window 70 formed below the door 67, and an acoustic hole 71 is formed in the center of the door 67.

Next, FIG. 3 is a view showing a state in which the indicator light 63, the district sound device 64, and the transmitter 65 are attached to the main body plate 66. In FIG. 3, the indicator light 63 is composed of a printed circuit board 73 on which a light emitting diode 72 is mounted, and an indicator light main body 75 which engages the printed circuit board 73 and is engaged with an indicator light mounting hole 74 formed in a main body plate 66. Is inserted from the back side of the main body plate 66 and is detachably attached to the side of the indicator light attachment hole 74. The district acoustic device 64 is composed of a printed board on which the polarity selection circuit, the buzzer, the buzzer drive circuit, etc. are mounted, and a main body 77 that houses the printed board and integrally forms the mounting portion 76, and is inserted from the back side of the main body plate 66. The mounting portion 76 is screwed to the side of the sound device mounting hole 78 formed in the main body plate 66 and mounted.

The transmitter 65 is provided with a mounting portion 79 having a screw hole. Transmitter 65 is attached to body plate 66
Of the transmitter mounting hole 80 formed around the transmitter mounting hole 80 formed in the main body plate 66 by being inserted from the back side of the
The screw 82 is screwed through the screw hole of the
Is screwed and fixed to the transmitter mounting hole 80. Indicator light 6
3. The other end of the lead wire 83, one end of which is connected to the district sound device 64 and the transmitter 65, is connected to the connector 84, and the lead wire 83 and the connector 84 are pulled out to the back side of the main body plate 66.

The other end of the lead wire, one end of which is connected to the terminal block 62, is connected to a connector. By connecting this connector to the connector 84, the terminal block 62 and each device are electrically connected. Connected. Next, FIG.
It is a figure which shows the main body 77 of FIG. In FIG. 4, reference numeral 86 denotes a printed board on which the polarity selection circuit, the driving circuit, and the like are mounted. The printed board 86 is housed in the main body 77.
Further, a resonance chamber for amplifying the sound of the buzzer is formed in the main body 77.

A plurality of slits 87 are formed at the lower end of the main body 77, and a pair of lead wires 88, 89 are formed in the slit 87.
And the lead wires 88 and 89 are connected to a pair of input portions 41 and 42 provided on the printed circuit board 86, respectively.
Further, a pair of connecting portions 55 and 5 provided on the printed circuit board 86 are provided.
The jumper wire 54 connecting between the six is drawn out between the slits 87.

Therefore, when the polarity selection circuit is applied to a fire receiver or the like having a disconnection detecting function, the polarity can be easily changed by simply cutting the jumper wire 54 drawn out from between the slits 87 on site. Can be. The jumper wire 54 is connected to the slit 8 formed in the main body 77.
Since it is pulled out of the main body 77 from the main body 77, it can be easily cut with scissors or a cutter without affecting the printed circuit board 86 when cutting at the site.

Further, in the above-described embodiment, an example in which the local acoustic device is housed in a disaster prevention equipment housing box together with an indicator light and a transmitter is taken as an example. May be attached.

[0031]

As described above, according to the present invention, since a district sound device equipped with a sound device such as a buzzer or a bell is connected via a non-polar circuit, workability is excellent. In addition, since it can be easily polarized, it can be applied to a fire receiver having a disconnection detection function.

Further, since the jumper wire is drawn out between the slits formed in the main body of the district sound apparatus, the polarization can be easily achieved on site by simply cutting the jumper wire.

[Brief description of the drawings]

FIG. 1 is a diagram showing a polarity selection circuit used in the present invention.

FIG. 2 is a cross-sectional view of a storage box for disaster prevention equipment provided with the acoustic device of the present invention.

FIG. 3 is a diagram showing an attached state of the acoustic device to a main body plate.

FIG. 4 is a diagram showing a main body of the acoustic device.

FIG. 5 shows a conventional example.

FIG. 6 is a diagram showing another conventional example.

[Explanation of symbols]

 41, 42: input part 43: plus output part 44: minus output part 45: buzzer or bell (sound equipment) 46: first diode 47: second diode 48: third diode 49: fourth diode 54 : Jumper wire 55, 56: Connection 57: Diode bridge circuit 60: Box 77: Main body 86: Printed circuit board 87: Slit

Claims (3)

(57) [Claims] 1. A pair of input sections for inputting a drive voltage, a pair of connection sections connected via a jumper wire, a pair of output sections for connecting audio equipment such as a buzzer and a bell, and the pair of inputs. A polarity selection circuit that forms a non-polar circuit when the jumper wire is connected between the unit and the connection unit and the pair of output units, and is switched to a polar circuit when the jumper wire is disconnected, A district acoustic device comprising: 2. The district acoustic apparatus according to claim 1, further comprising: a printed circuit board on which said polarity selection circuit is mounted; and a main body for housing said printed circuit board; Lead wires connected to a pair of input portions provided on the board are fitted into the slits, and jumper wires connected to the pair of connection portions provided on the printed board are drawn out from between the slits. The district audio equipment. 3. The district sound apparatus according to claim 1, wherein said polarity selection circuit is a diode bridge circuit.