KR100236244B1 - Electric shutter device for fire shutter - Google Patents

Abstract

The present invention relates to an electric switching device for fire shutter.

Conventionally, in the electric switchgear, the drive motors M1 to M8 and the switches S1 to S8 use a wiring method corresponding to 1: 1, which leads to waste of wiring and complexity of wiring. In addition, by using a gear type limit (L) to detect the rising / falling position of the shutter plate, it not only complicates the structure of the reducer, but also is cumbersome to use, frequent failures, and high malfunction rate. There was a problem.

The present invention has been made in view of the above-mentioned conventional problems, and the present invention provides a wider range of piping wiring by allowing wiring to be performed using only two signal lines when connecting and connecting the switch unit of the electric switching device and the motor control unit. In order to reduce the cost and to use the position control method that senses the change in voltage, it is easy to use. Also, in case of a fire, the shutter plate lowering action of the fire shutter will automatically descend after a certain time stops at a certain position. By providing the double descent shutter function, the toxic gas and smoke are discharged immediately for a short time after the fire so that the evacuated people are not suffocated by toxic gas or smoke.

Description

Electric switchgear for fire shutter

The present invention relates to an electric opening and closing device for a fire prevention shutter, and more particularly, to an electric opening and closing device for a fire prevention shutter for controlling the rising and falling of the shutter plate in a fire prevention shutter installed in a building to prevent the spread of fire. .

In general, commercial buildings such as department stores, large shopping malls, hotels, etc. are obliged to install fire shutters to prevent the spread of fires in the event of a fire.

Therefore, in Korea, fire prevention shutters are basically installed in general large buildings, and the installation of such fire shutters minimizes the loss of property due to fire and further protects human life from fire. It is in charge of this situation.

Unlike general security shutters, fire prevention shutters are usually made to withstand high impact and high heat and have a complete shielding effect from flames. The structure of the shutter plate (100) is connected to a narrow and elongated steel plate up and down. Both ends of the shutter plate 100 are embedded in a wall or a pillar, and guide rails 200 guide the lifting and lowering of the shutter plate 100, and are installed on the shutter plate 100, and the shutter plate 100 is installed. It consists of a shutter box with a built-in drive device for opening and closing (up and down), and a switch device for manually controlling the drive device from the outside, and when a fire occurs, the shutter is released by a fire detection sensor irrespective of the switch device. When the plate 100 automatically descends, and fire protection shutter is operated regardless of fire (when used for crime prevention or when testing the operation of the fire protection shutter), a separate switch device is installed. By operating, the motor is driven to raise or lower the shutter plate 100. On the other hand, the shutter plate 100 may be installed separately from the emergency door or integrally.

On the other hand, in the case of the electric opening and closing device for driving the motor in the conventional fire shutter, as shown in the wiring diagram of Fig. 1 drive motors (M1 ~ M8) and switches (S1 ~ S8) for moving each shutter plate 100 ) 1: 1 correspondence, each has a wiring structure in which four signal lines (W) for connecting a pair of switches (e.g., S1) and a driving motor (e.g., M1) are connected and connected. If the 32 signal lines are required), and also as a means for detecting the completion of the rising and falling of the shutter plate 100 to move up and down as shown in the example of Figure 2 gear limit (L; upper limit (UL) and limit) ( DL)) has been used to determine the ascending and descending position of the shutter plate 100 through the switching operation of the micro switch in contact with the gear by mounting the reduction gear (G).

However, in the configuration of the electric opening and closing device as described above, the use of the wiring method corresponding to 1: 1 for the drive motors M1 to M8 and the switches S1 to S8, respectively, leads to waste of wiring and complexity of wiring. In addition, in the case of detecting the rising and falling completion position of the shutter plate 100 by using the gear type limit (L) not only complicates the structure of the reducer, but also is cumbersome to use, frequent failure and malfunction There was a problem in product reliability, such as high incidence rate, and in the conventional fire shutter, the fire shutter automatically operates when a fire occurs, but the shutter plate 100 descends by one operation to completely shield the space where the fire occurred. Since there is a person who could not be evacuated in the space shielded by the shutter plate 100 because it is used in the evacuation process And it had been pointed out as problems in personal protection levels, toxic no way to escape suffocated by gas.

Accordingly, in the present invention, when connecting the switch unit constituting the electric opening and closing device and the control unit of the driving motor, the entire wiring is made only by two signal lines, so that a significant reduction in the piping wiring can be achieved. In order to achieve high quality of the interior interior, and to use the position control method that detects the amount of change in voltage in detecting the moving position of the shutter plate, it is easy to use through the simplification of the structure. Toxic gas and smoke are discharged for a short time immediately after the fire by adopting a fire shutter shutter drive system that allows the plate lowering operation to stop automatically at a certain position (eg 2m) for a certain time (eg 30 seconds to 2 minutes) and then descend automatically again. Do this immediately so that people who are evacuated are not suffocated by toxic gases or smoke. The will that purpose.

1 is a wiring diagram of a conventional electrical switching device for fire shutter

Figure 2 is an exemplary view showing the installation state of the gear type limit in the conventional fire breaker electric switch

Figure 3 is a wiring diagram of the electric switching device for fire shutter according to the present invention

Figure 4 is an exemplary view showing an installation state of the position control limit applied to the present invention

5 is an overall configuration diagram of the present invention

6 is a configuration diagram of a switch unit constituting the present invention

7 is a connection diagram illustrating a control unit, an interlocking control unit, and a driving unit of the present invention;

8 is a detailed view of a switch unit constituting the present invention;

9 is a detailed view of a control unit, an interlocking control unit, and a driving unit of the present invention;

FIG. 10 is an exemplary view of the output state detecting unit shown in FIG.

11 is an external view showing an example of a fire shutter

(Explanation of symbols for the main parts of the drawing)

1: code granting circuit, 2: code memory circuit

3: code display circuit, 4: input circuit

5: modulation circuit, 6: transmitting circuit

7: reception circuit, 8: reverse modulation circuit

9: code applying circuit, 10: switch unit,

12: output state sensing circuit, 13: upper control circuit

14: lower control circuit, 15: output control circuit

20: control unit 30: interlocking control unit,

31: capacitor 32: random stop point detection circuit

33: designated time delay circuit 40: driver

50: power supply, 60: shutter plate movement detecting device

61: slide resistor, 62: slide terminal

63: moving member, 64: rotating shaft

70: signal line, 100: shutter plate

200: guide rail, 300: shutter box

M1 to M8: Drive motor, SW1 to SW8: Motor select switch

U-SW: Upward movement switch, S-SW: Stop switch

D-SW: Downward Moving Switch

Fire switch shutter for the present invention for achieving the above object provides the following structural features.

In the event of a building fire, driving the motors M1 to M8 by the operation of the electric switchgear automatically lowers the shutter plate 100 to prevent the spread of fire, and operates the separately installed switch to raise or lower the shutter plate 100. In the building fire shutter,

A switch unit (10) for designating driving motors (M1 to M8) for controlling the raising and lowering of the shutter plate (100), and for selecting and specifying an upward high moving direction of the shutter plate (100);

The switch unit 10 is connected to two signal lines 70, and when a signal is transmitted from the switch unit 10 through the signal line 70, the input selection motor code and the designated motor code are compared, and the shutter plate. The control unit 20 detects an amount of change in voltage input from the movement detecting device 60 to determine the current position of the shutter plate 100 and outputs a control signal for outputting a control signal for raising and lowering the shutter plate 100. ;

It is connected to the control unit 20 and the brake devices (B1 to B8), when a fire occurs and the power of the power supply unit 50 is cut off, the power supply of the capacitor 31 is supplied to the brake devices (B1 to B8) to the shutter plate ( Releases the brake holding the brake 100 and releases the shutter plate 100 by its own weight, and outputs a control signal for temporarily stopping the descending specific shutter plate 100 for a predetermined time. Interlocking control unit 30;

A driving unit which consists of a plurality of relay elements RY1 to RY5 and controls the driving motors M1 to M8 and the brake devices B1 to B8 in response to control signals output from the control unit 20 and the interlocking control unit 30. 40;

A shutter plate movement detecting device 60 connected to the driving motors M1 to M8 and detecting a moving position of the shutter plate 100 to inform the controller 20 of the current position of the shutter plate 100;

By configuring the electric opening and closing device for a fire shutter including a, the lifting and lowering control of the shutter plate 100 through the two-line signal line 70 connecting between the switch unit 10 and the control unit 20 in the remote position It is to be carried out.

Therefore, according to the present invention, by using the position control method for detecting the rising and falling position of the shutter plate 100 by detecting the amount of change in voltage, it provides the ease of use and high reliability, and the switch unit 10 and By using the two signal lines 70 between the control unit 20, it is possible to provide an effect of greatly reducing materials such as pipe wiring.

(Example)

Hereinafter, the present invention will be described in more detail with reference to the attached non-limiting exemplary drawings.

Figure 3 shows a wiring diagram of the electric switching device for a fire shutter according to the present invention, Figure 4 is an exemplary view showing the installation of the position control limit applied to the present invention, Figure 5 is a block diagram showing the overall configuration of the present invention, 6 shows a configuration of a switch unit constituting the present invention, and FIG. 7 shows a configuration of a control unit, an interlocking control unit, and a driving unit constituting the present invention.

As shown in Figure 1, the electric switch for fire prevention shutter of the present invention,

Switch unit 10 for selecting and designating driving motors M1 to M8 for raising and lowering control of shutter plate 100, and receiving a signal input from the switch unit 10 through two signal lines 70. Control unit 20 for outputting a control signal for controlling the lifting and lowering of the 100, interlocking control unit for supplying power to the control unit 20 and the brake device (B1 to B8) in the event of a fire and automatically lowering the shutter plate 100 30, and the driver 40 composed of a plurality of relay elements and a large power supply unit 50 for converting and supplying AC power to DC power,

The switch section 10 includes a code attaching circuit 1 composed of a plurality of motor selection switches SW1 to SW8 for designating the drive motors M1 to M8 to be operated, and the motor of the code attaching circuit 1. A code memory circuit 2 for latching a signal input through the selection switches SW1 to SW8, a code display circuit 3 for externally displaying the designated drive motors M1 to M8, and a shutter plate 100. An input circuit (4) for designating a moving direction, a modulation circuit (5) for outputting a modulation signal in accordance with an input signal specified through the code assigning circuit (1) and the input circuit (4), and the modulation circuit And a transmitting circuit 6 which amplifies and transmits the modulated signal transmitted from (5).

The code memory circuit 2 includes a latch element IC1, an inverter IC2 having a pulse generation function, a resistor R1, a capacitor C1, and a NAND gate NAND that determine a time constant. Is composed,

The input circuit 4 includes an upward movement switch (U-SW) for winding up the shutter plate 100 (opening) and a downward movement switch for releasing and lowering the raised shutter plate 100 (closed). (D-SW) and a stop switch (S-SW) for stopping the lifting and lowering operation of the shutter plate 100 at a predetermined position.

The control unit 20 drives the receiving circuit 7 for receiving a signal (modulated signal) transmitted from the transmitting circuit 6 of the switch unit 10 located at a remote position via the two-strand signal lines 70. A code assigning circuit (9) for assigning a designated motor code to the motors (M1 to M8) and a signal received by the receiving circuit (7) are inversely modulated to designate the selected motor code and the designated motor code of the code attaching circuit (9). When the motor code is matched by comparison, the inverse modulation circuit 8 outputs a signal, the output state sensing circuit 12 for detecting the amount of change in the voltage input from the shutter plate movement detecting device 60, and the shutter plate 100. ) Reaches the top dead center, the upper control circuit 13 outputs a signal for stopping the rising operation of the shutter plate 100, and when the shutter plate 100 reaches the bottom dead center, the lowering operation of the shutter plate 100 is stopped. A lower control circuit 14 for outputting a signal to make a signal to be outputted, a signal input from the inverse modulation circuit 8, and In accordance with the signal inputted from the lower side control circuit 13, 14 an output control circuit 15 for outputting a control signal for driving the drive motor (M1~M8).

The interlocking control unit 30 has a built-in capacitor 31 for supplying power to the electric control device and the brake devices (B1 to B2) when the power of the power supply unit 50 is cut off due to the fire, the interlocking control unit 30 ) Releases the brakes of the brake devices B1 to B8 holding the shutter plate 100 in the event of a fire emergency so that the shutter plate 100 descends due to its own weight, and also provides an arbitrary stop point detection circuit 32. And a designated time delay circuit (33).

The random stop point detection circuit 32 is connected to the output state detection circuit 12 of the controller 10, and a comparator OP3 and an inverter comparing the voltage input from the output state detection circuit 12 with a reference voltage. The device is configured to output a control signal for stopping the shutter plate 100 when the specified shutter plate 100 starts to descend and reaches a predetermined point (for example, 2m).

The predetermined time delay circuit 33 includes a timer T, and receives the signal input from the random stop point detection circuit 32 and the shutter plate 100 for a predetermined time (for example, 30 seconds to 2 minutes). It serves to brake the shutter plate 100 by stopping the power supply of the brake devices B1 to B8 to stop the operation.

The driving unit 40 is connected to the output of the control unit 10 and the interlocking control unit 30, and is composed of several relay elements RY1 to RY5, where RY1 receives a signal from the upper control unit 13 and brake device ( The shutter plate 100 stops at the top dead center by cutting off the power of B1 to B8, and RY2 receives the signal from the lower control unit 14 to cut off the power of the brake devices B1 to B8. RY3 and RY4 are output relay elements, and RY3 receives signals from the latch element IC3 of the output control circuit 15 to operate the driving motors M1 to M8. (E.g., forward rotation) to raise the shutter plate 100, and RY4 operates the driving motors M1 to M8 in response to a signal from the latch element IC3 of the output control circuit 15 (e.g., reverse). Rotation) to lower the shutter plate 100.

The power supply unit 50 shown in FIG. 7 is a power supply circuit for supplying a constant voltage to the switch unit 10, the control unit 20, and the motor driving unit 40 constituting the electric switching device by rectifying the AC power input. In case of emergency, the power supply is cut off.

The shutter plate movement detecting device 60 shown in FIG. 10 is a device for detecting the rising position and the falling position of the shutter plate 100. The slide resistor 61; And a slide terminal 62 connected to the slide resistor 61, the slide terminal 62 is fixedly installed, and a movable member 63 is installed to allow left and right movement, and a drive motor M1. The rotating shaft 64 is rotated by the power source of ˜M8 and engaged with the inner diameter gear (not shown) of the moving member 63 to linearly move the moving member 63 to the left and right.

The signal line 70 composed of two strands connects the switch unit 10 and the control unit 20 provided in each of the driving motors M1 to M8, and a control command for rising stop and falling as selected by the switch unit 10. It serves to transmit to the control unit 20.

Referring to the operation of the present invention having such a configuration,

first; In case of test operation of fire shutter and use for crime prevention

When the driver presses the designated motor selection switch SW1 of the code applying circuit 1 constituting the switch unit 10 to raise or lower the shutter plate 100 installed at a predetermined position of the building (manual operation), the code By the latch element IC1 constituting the memory circuit 2, the code of the drive motor (e.g., M1) designated by the user is stored and the corresponding lamp of the code display section 3 is turned on at the same time. Subsequently, the modulation circuit 5 is configured by selecting and pressing the upward movement switch (U-SW) or the downward movement switch (D-SW) or the stop switch (S-SW) constituting the input circuit 4. The control unit CU1 analyzes the selected motor code inputted through the code memory circuit 2 and the signals inputted through the input circuit 4 (rising and stopping signals of the shutter plate) and modulates the signal to transmit the circuit. (6), the transmission unit (TU) constituting the transmission circuit (6) amplifies the input modulation signal and is located at a distance remote from the switch unit (10) through two signal lines (70). The control unit 20 is transmitted to.

Then, the receiving element RU constituting the receiving circuit 7 of the control unit 20 receives the signal transmitted from the switch unit 10 and applies it to the inverse modulation circuit 8. Then, in the control unit CU2 constituting the inverse modulation circuit 8, the input signal is again inversely modulated to recognize the selection motor code of the selected drive motor (eg M1) and the drive motor recognized by the code applying circuit 9 (eg Checks the designated motor code of M1) and outputs a signal to the output control circuit 15 if it matches.

On the other hand, in the shutter plate movement detecting device 60 connected to the drive motors M1 to M8 to detect the moving position of the shutter plate 100, the shutter plate 100 is in the rising position (top dead center) or lowered. The current position of the shutter plate 100 is determined by the amount of change in voltage appearing at the position (bottom dead center). That is, the output voltage is different depending on the position where the slide terminal 62 is connected to the slide resistor 61. As shown in FIG. 10, as the slide terminal 62 is positioned on the right side (when the driving motor rotates forward), the resistance is increased. The larger the value and the more it is located on the left side (when the drive motor is reversed), the smaller the resistance. For example, when the M1 driving motor is selected and the downward movement switch (D-SW) is selected, if the shutter plate 100 is at an elevated position (top dead center), the slide terminal 62 is connected to the slide resistor 61. Since it is located on the right side, a high voltage is output so that a high voltage is applied to the output state detection circuit 12. Therefore, the voltage is simultaneously input to the upper and lower control circuits 13 and 14, and the comparators OP1 and OP2 constituting the same circuit output signals by comparing the input voltage and the reference voltage. Since the final output signals of the 13 and 14 all show a high state, the transistors TR1 and TR2 of the output control circuit 15 operated in the low state cannot be conducted. At this time, the output control circuit 15 latches the circuit based on a signal input from the reverse modulation circuit 8 (shutter plate falling signal; motor reverse rotation signal) and a signal input through the upper and lower control circuits 13 and 14. By outputting a signal through IC3, the relay element RY4 constituting the driving unit 40 is controlled to rotate the selected driving motor M1 in reverse, so that the shutter plate wound and mounted on the shutter box 300 ( 100 is guided to the guide rail 200 to descend. When the lowering operation of the shutter plate 100 is started and the shutter plate 100 reaches the bottom dead center, the relay element RY2 is controlled by the lower control circuit 14, so that braking by the brake device B1 is applied. The shutter plate 100 is no longer lowered.

On the other hand, in order to wind up the shutter plate 100 lowered in reverse, the switch unit 10 selects and selects the motor selection switches SW1 to SW8 of the shutter plate, and then sets the upward movement switch U-SW. When pressed, the relay element RY3 of the driving unit 40 is turned on by the control operation of the control unit 20, and the driving motor M1 operates (forward rotation) to wind the shutter plate 100 on the shutter box 300. The brake device B1 is released.

In addition, in order to stop the moving shutter plate 100 at a predetermined position, when the stop switch S-SW is pressed by the switch unit 10, the brake device B1 is controlled by the control signal of the output control circuit 15. Since B8 is braked, the shutter plate 100 stops at a predetermined position.

second; When operating with fire shutter in case of fire

Assuming that a fire occurs in a specific space in a state in which a fire shutter installed in a building is wound up on the shutter box 300 (opening), once the building is automatically cut off electricity, power is supplied to the electric switching device of the present invention. The power supply unit 50 is also in a state where the power supply is cut off. At this time, the function of the switch unit 10 is cut off, and in the interlocking control unit 30 constituting the present invention, a fire occurrence signal is input through a fire detection means such as a fire detector, and the signal is built into the interlocking control unit 30 by this signal. In the capacitor 31, the power supply is immediately output and the DC power is supplied to the constant voltage circuit as shown in FIG. At the same time, power is also supplied to the brake devices B1 to B8 holding the shutter plate 100 to release the brakes of the brake devices B1 to B8 that are braking the shutter plate 100. All the fire shutter shutter plate 100 is lowered in one's own gravity.

Therefore, by shielding the fired space at a time to prevent the spread of the flame to protect the life and property from the fire.

On the other hand, the electric opening and closing device of the present invention is provided with a double lowering shutter function, the shutter plate which is lowered by its own weight with respect to the specific shutter plate installed on the entrance side among the shutter plate 100 installed in a large number (for example, from the ground) When 2m) is reached, a temporary stop (from 30 seconds to 2 minutes) is provided to enable the external emission of smoke and harmful gas, and after a certain time, it gives the function of double descent shutter to reload again. have.

That is, as shown in FIG. 9, the random stop point detection circuit 32 compares the voltage input from the output state detection circuit 12 and the reference voltage through the comparator OP3 and outputs a signal when the magnitudes of the two voltages match. Since the signal is input to the designated time delay circuit 33 and output to the driver 40, the specific shutter plate designated by the driving of the relay element RY5 is stopped for a predetermined time during the delay time of the timer T. It is possible to prevent people who have not been evacuated from the fire space from being suffocated by smoke and harmful gases during the evacuation.

As described above, according to the present invention, since the position control of the shutter plate is performed by using the amount of change in voltage, the ease of use and high reliability are provided, as well as the switch unit 10 and the control unit 20 located at remote locations with each other. By adopting the wiring method that connects only two lines of signal line 70, the piping and wiring can be simplified, saving material and realizing high quality interior, and providing double drop shutter function to protect human life in case of fire. It will provide an effect that can greatly contribute to.

What has been described above is only one embodiment for explaining the electric opening and closing device for a fire shutter according to the present invention, the present invention is not limited to the above-described embodiment is outside the gist of the invention claimed in the following claims Without this, any person skilled in the art to which the present invention pertains may make various changes.

Claims (4)

In the event of a building fire, driving the motors M1 to M8 by the operation of the electric switchgear automatically lowers the shutter plate 100 to prevent the spread of fire, and operates the separately installed switch to raise or lower the shutter plate 100. In the building fire shutter, A switch unit (10) for designating driving motors (M1 to M8) for controlling the raising and lowering of the shutter plate (100), and for selecting and specifying the phase high moving direction of the shutter plate (100); The switch unit 10 is connected to two signal lines 70, and when a signal is transmitted from the switch unit 10 through the signal line 70, the input selection motor code and the designated motor code are compared, and the shutter plate. A control unit 20 for detecting a change amount of the voltage input from the movement detecting device 60 to determine a current position of the shutter plate 100 and outputting a control signal for raising and lowering the shutter plate 100; It is connected to the control unit 20 and the brake devices (B1 to B8), and if a fire occurs and the power of the power supply unit 50 is cut off, the power of the capacitor 31 is supplied to the brake devices (B1 to B8) to release the shutter plate. Releases the brake holding the brake 100 so that the shutter plate 100 is lowered by its own weight, and at the same time, a control signal for temporarily stopping the descending specific shutter plate 100 at a certain point for a predetermined time. An interlock control unit 30 for outputting; A driving unit which consists of a plurality of relay elements RY1 to RY5 and controls the driving motors M1 to M8 and the brake devices B1 to B8 in response to control signals output from the control unit 20 and the interlocking control unit 30. 40; A shutter plate movement detecting device 60 connected to the driving motors M1 to M8 and detecting a moving position of the shutter plate 100 to inform the controller 20 of the current position of the shutter plate 100; The electric opening and closing device for a fire shutter characterized in that it comprises a. The method of claim 1, wherein the switch unit 10, A code applying circuit (1) consisting of a plurality of motor selection switches (SW1 to SW8) for designating the drive motors (M1 to M8) to be operated, and motor selection switches (SW1 to SW8) of the code applying circuit (1). The code memory circuit 2 for latching the signal input through the code, the code display circuit 3 for displaying the designated drive motors M1 to M8 to the outside, and the movement direction of the shutter plate 100 are designated. Amplifying a modulated circuit 5 for outputting a modulated signal in accordance with an input signal through an input circuit 4, a code attaching circuit 1 and an input circuit 4, and a modulating signal transmitted from the modulated circuit 5 Fire opening shutter for electric fire, characterized in that consisting of a transmitting circuit (6) for transmitting by. The method of claim 1, wherein the control unit 20, Receiving circuit 7 for receiving a signal (modulated signal) transmitted via two signal lines 70 from the transmitting circuit 6 of the switch section 10 at a remote position, and drive motors M1 to M8. Inversely modulates the signal receiving circuit 9 to which the designated motor code is assigned and the signal received by the receiving circuit 7 and compares the selected motor code with the designated motor code of the code assigning circuit 9. If there is a match, the inverse modulation circuit 8 for outputting a signal, the output state sensing circuit 12 for detecting the amount of change in voltage input from the shutter plate movement detecting device 60, and the shutter plate 100 reach top dead center. The upper control circuit 13 for stopping the upward operation of the shutter plate 100 and the lower control circuit for outputting a signal for stopping the downward operation of the shutter plate 100 when the shutter plate 100 reaches the bottom dead center ( 14) and a signal input from the inverse modulation circuit 8 and input from the upper and lower control circuits 13 and 14; And an output control circuit (15) for outputting a control signal for driving the driving motors (M1 to M8) according to the signal. The method of claim 1, wherein the interlocking control unit 30, The shutter plate 100 connected to the capacitor 31 for supplying DC power to the electric switchgear and brake devices B1 to B8 in case of emergency fire, and the output state sensing circuit 12 of the control unit 20 to descend by self-gravity. ) And a control signal for stopping the shutter plate 100 for a predetermined time in response to a signal of the random stop point detection circuit 32 and a random stop point detection circuit 32 for outputting a control signal to stop at an arbitrary point. Fire switch for electric fire switch characterized in that consisting of a predetermined time delay circuit 33 for outputting.

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