JPH10102951A - Device for detecting obstacle to shutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the malfunction of an obstacle detecting device to inform an operator of it more appropriately and to enable a shutter to be always controlled to the safe side if an obstacle is detected. SOLUTION: The malfunction of an obstacle detecting device is detected by means of a lower limit switch located in a position lower than a floor face when a shutter is lowered. The voltage monitoring part 28 of a malfunction control part 2b sets a flag during operation of the lower limit switch and stops the shutter. When the shutter is thereafter controlled by the PBS of the control part to rise or fall, the shutter is controlled for rising or falling only during the period in which self-holding action is canceled, so that the operator is informed of the malfunction of the obstacle detecting device by the action of the shutter itself. When a stop push button is pressed the shutter is restored to its self-holding state and can be restored to its normal opening and closing action.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter obstacle sensing device for controlling the operation of a shutter to a safe side when an obstacle comes in contact with the obstacle.

[0002]

2. Description of the Related Art A shutter that moves up and down an opening is provided with an obstacle sensing device that controls the shutter safely when an obstacle is sensed during the up and down movement. This obstacle sensing device is disclosed, for example, in Japanese Utility Model Publication No. 55-53036.

An obstacle sensing device is provided on a shutter seat plate, and outputs a sensing signal to an upper receiving portion (such as a shutter case) by a light signal from a transmitting portion when an obstacle is sensed, so that the control panel is safe. This is a configuration for performing control. More specifically, when an obstacle comes into contact with a sensor below the seat plate while the shutter is descending, the transmitting unit transmits a sensing signal. The sensor includes a seat plate switch for detecting the movement of the sensing piece, a tape switch, and the like.

The receiving section receives the sensing signal and outputs a stop control signal to the control panel to stop the shutter from lowering. Further, as another safety control, there is a method in which the lowering of the shutter is stopped by sensing an obstacle, and then the shutter is inverted and then stopped again.

The transmitting section is driven by a battery. When the voltage of the battery drops, it is impossible to transmit a sensing signal even if it comes into contact with an obstacle. For example, Japanese Patent Publication No. 7-7457
No. 7).

[0006]

However, even if the device for detecting the voltage drop of the battery is activated and the operator is informed by a buzzer or the like, the operator may be injured by the lack of sound volume due to the environment or the failure of the buzzer. It is conceivable that the state will not be transmitted. At this time, the user opens and closes the shutter without knowing that the obstacle sensing function does not operate, even though the function is not working. When this state continues for a long period of time, the voltage of the battery of the transmitting unit is lost, and it is considered that the sensing signal from the transmitting unit cannot be transmitted. Further, when the shutter is in the fully closed state for a long period of time, it is conceivable that the battery of the transmitting unit runs out during this fully closed period.

[0007] Since the battery of the transmission section as described above is periodically replaced, it is rare to use the battery until it is exhausted. In contrast, the battery is provided in an obstacle sensing device and is used when an obstacle comes into contact. It is necessary to consider the occurrence of malfunction of the sensing means (such as a sensing switch and a mechanism for moving the seat plate) that operates. If the sensing means malfunctions, the sensing signal is not transmitted even if the battery is at the normal voltage, and the obstacle cannot be sensed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and can detect an imperfect sensing operation of an obstacle sensing device and inform the operator appropriately of the sensing operation.
An object of the present invention is to provide a shutter obstacle sensing device that can always control the shutter to a safe side when an obstacle is sensed.

[0009]

In order to achieve the above object, a shutter obstacle detecting apparatus according to the present invention is provided.
As described, an operation unit for performing a shutter opening / closing operation, an obstacle sensing device that outputs a sensing signal when an obstacle comes into contact with the shutter, and the shutter has moved to a position corresponding to a position below the floor surface. Lower limit detection means for detecting that the obstacle detection device is malfunctioning when the lower limit detection means detects the malfunction, stores the state of the malfunction and stops the shutter, and the stored value indicates the operation. A defect control unit that opens and closes a shutter in a state different from a normal state even when the operation unit is opened and closed during a period in which the operation unit is in a defective state.

[0010] According to a second aspect of the present invention, the failure-time control section 2b receives the sensing signal from the obstacle sensing device and controls at least stop of the shutter to secure opening and closing. it can.

Further, as described in claim 3, the malfunction control section 2b notifies the operation failure state to the outside via the notification section 30 when it is determined that the operation of the obstacle sensing device is malfunction. It may be.

Further, as described in claim 4, the malfunction control unit 2b determines that the operation of the obstacle sensing device is malfunctioning, and then, when receiving the sensing signal from the obstacle sensing device, determines that the malfunction has occurred. It is possible to adopt a configuration in which the memory of the state is cleared, the shutter is determined to be normal, and the shutter is opened and closed in the normal state.

According to a fifth aspect of the present invention, a sensing signal is output when an obstacle comes into contact with the operation unit PBS provided with each of the up / down / stop push-button switches for opening and closing the shutter. Based on the operation of the obstacle sensing device, the lower limit switch 21 for detecting that the shutter has moved to a position corresponding to a position below the floor, and the push button switches 10 and 13 for raising or lowering the operation unit, the operation is performed. Self-holding relay contact OM, which continuously self-holds and supplies power for driving the switch M in the direction of
Opening / closing control means 3 having a CM and a self-holding release which is connected to a self-holding relay contact of the opening / closing control means 3 via a connection line and which can supply and / or cut off power supply to the self-holding relay contact. And a failure control section 2b that opens the self-holding release relay contact when the lower limit switch is detected and holds the self-holding in the released state when the lower limit switch is detected.

As described in claim 6, the failure time control unit 2b includes a voltage monitoring unit 28 connected to the opening / closing control means 3 and detecting an operation state of the lower limit switch 21 by a voltage change. An operation detection unit 29 for detecting the operation state of the stop pushbutton switch 16 of the operation unit by a voltage change is provided, and in the self-hold release state, receiving the operation of the stop pushbutton switch and setting the self-hold release relay contact. It is also possible to adopt a configuration in which the operation of the pushbutton switch for closing and subsequent ascending / descending can be held by itself.

According to the above configuration, when the obstacle sensing device that senses that an obstacle has come into contact with the shutter is malfunctioning, a sensing signal is not output even if the shutter is in contact with the floor, and the shutter is located below the floor. It is detected by a lower limit switch 21 that detects a shutter at a position. The voltage monitoring unit 28 of the failure time control unit 2b detects the operation state of the lower limit switch 21 by a voltage change, stores the operation failure state upon detection, and stops the shutter. Also, during the period when the memory is in the malfunction state, the shutter is opened and closed in a state different from the normal state even if the operation unit PBS is opened and closed, and the malfunction of the obstacle sensing device is notified to the operator by the operation of the shutter itself. Let me know. At this time, the notification unit 30 externally notifies the malfunction state by sound or the like. Thereafter, when a sensing signal is received from the obstacle sensing device, the memory indicating the malfunction is cleared, the state is determined to be normal, and the shutter is opened and closed in the normal state.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In this embodiment, the opening / closing control means 3
Are operated by a commercial power supply (three-phase alternating current) to control the rotation of the switchgear M. An obstacle sensing device is provided on a seat plate of the shutter, and the obstacle sensing device includes a sensing mechanism that operates when an obstacle contacts and a transmission unit 2a that transmits a sensing signal when the sensing mechanism operates.

Examples of the configuration of the sensing mechanism include a configuration in which a seat plate and a sensing switch that are movable with respect to a shutter move the seat plate when an obstacle comes in contact with the sensing switch, and a tape switch or the like is provided on the seat plate portion. It can be configured to be provided directly. This sensing mechanism operates not only at the time of contact with an obstacle but also at the time when the shutter descends and comes into contact with the floor surface. The sensing signal from the transmission unit 2a is received by the reception circuit 25 of the failure time control unit 2b and output to the opening / closing control unit 3, and the opening / closing control unit 3 controls such that shutter opening / closing is stopped or the like so as to be safe. The transmission medium between the transmission unit 2a and the reception circuit 25 may be light of a predetermined wavelength, radio waves of a predetermined frequency, or the like.
One that can wirelessly transmit the sensing signal to the receiving circuit 25 side is used. In addition, the configuration is not limited to wireless communication, and a configuration in which wired transmission is performed via an electric wire path may be adopted. As a specific example, there is a configuration in which a tape switch is provided along the vertical direction of the guide rail, and the pressing piece presses the tape switch in the guide rail when the sensing mechanism is activated. It is directly connected to the hour control unit 2b.

The open / close control means 3 comprises a power supply circuit and a control circuit. The power supply circuit is connected between the power supply line and the switch M, and controls the power supply to open / close the shutter by rotating the switch M forward / reverse. For example, for a three-phase AC power supply line, a relay contact for opening and closing (connected in a form where two phases are interchanged) is arranged in each phase, and one of the relay contacts is closed, so that a switchgear is provided. M is controlled to rotate forward / reverse. The control circuit includes an operation unit PB
Each open / close switch of S is connected by predetermined wiring, and in response to the open / close operation of the operation unit PBS, the relay contact of the power supply circuit is controlled to open / close, and the power supply to the switch M is switched to open / close the shutter.

The control circuit of the opening / closing control means 3 is shown in the circuit diagram of FIG. The control circuit has an open circuit and a closed circuit connected in parallel to the power supply line. The open-side circuit includes an ascending push button switch 10 and an opening relay 11 in series with the push button switch 10. The closing circuit has a pushbutton switch 13 for descending and a relay 14 for closing in series with the pushbutton switch 13.

A pushbutton switch 1 for stopping a normally closed contact
6 and the relays 11 and 14 for opening and closing the open-side circuit and the close-side circuit, respectively, in parallel via the self-holding release relay contact RY1 of the relay control unit 27 of the failure time control unit 2b. , Self-holding relay contact for opening 1
8 and a self-holding relay contact 19 for closing are connected.

When the ascending push button switch 10 is pressed, the self-holding relay contact 18 is closed, the opening relay 11 is energized, and the opening power is supplied to the switch M. Thereafter, even if the lifting push-button switch 10 is released, the release relay 1 is connected via the self-holding relay contact 18.
1, the switch M is continuously driven to open the shutter.

When the shutter reaches the upper limit position, the upper limit switch 20 in series with the opening relay 11 of the opening circuit opens, the opening relay 11 is de-energized, and the switch M stops. Also, when the stop push button switch 16 is operated, the opening relay 11 is turned off, and the switch M is stopped.

The shutter lowering operation is performed in substantially the same manner as the opening operation by operating the lowering push-button switch 13 through the self-holding relay contact 19.
4 is continuously lowered until the sensing means operates and the opening / closing control means 3 performs stop control (or until the lower limit detection means detects). Also at the time of the downward movement, the closing relay 14 is similarly de-energized by operating the stop push button switch 16, and the switch M is stopped.

The lower limit detecting means can be constituted by a lower limit switch 21 as shown in the figure, and is set at a position lower than a position where the shutter contacts the floor.
Specifically, the lower limit switch 21 is configured by a counter unit that counts the number of rotations of the switch M,
In this counter section, a count value corresponding to a position lower than a count value corresponding to a position where the shutter contacts the floor is set. That is, the lower limit switch 21 does not operate when the shutter is normally opened and closed, and when the shutter comes into contact with the floor, the obstacle sensing device operates and the opening / closing control means 3 stops descending. When the contact with the floor surface is not detected at the time of the abnormality, the lower limit switch 21 is opened to stop the shutter.

Next, the control circuit 2b is connected to the control circuit of the opening / closing control means 3 via a predetermined number of connection lines 23. As shown in FIG. 1, the internal configuration of the failure time control unit 2b is provided with a receiving circuit 25 for receiving a sensing signal wirelessly transmitted from the transmitting unit 2a.
Is output to

When the shutter comes into contact with an obstacle and a sensing signal is input from the receiving circuit 25, the signal determination unit 26 performs safety control such as stopping the relay control unit 27. When an operation signal is input from a voltage monitoring unit 28, which will be described later, it is determined that the obstacle sensing device is malfunctioning, and the relay control unit 27 is controlled to stop and release self-holding. Thereafter, when a detection signal is input from an operation detection unit 29 described later, the self-hold release state is returned to a self-holdable state (initial state). When the signal determination unit 26 determines that the obstacle sensing device is in a normal state, the signal determination unit 26 maintains the storage content (flag) of the storage unit that stores the operation determination of the obstacle sensing device in a 0 (clear) state, and maintains a self-hold state. When it is determined that the operation is in a malfunction state (during the period of self-hold release), the flag is held at 1 (set) state.

The relay control unit 27 controls the supply / interruption of power supply to each relay of the open-side circuit and the close-side circuit provided in the control circuit of the open / close control means 3 via the connection line 23. The relay control unit 27 is provided with a plurality of relay contacts shown in FIG. The self-holding release relay contact RY1 is connected to a common connection point P of the stop push button switch 16, the ascending push button switch 10, and the descending push button switch 13.
1 and a common connection point P between the self-holding relay contacts 18 and 19
2 is a normally closed contact provided between the first and second contacts. Signal determination unit 26
Determines that the obstacle sensing device is malfunctioning, the self-holding release relay contact RY1 is opened to release the self-holding, and thereafter, when returning to the initial state, the self-holding releasing relay contact RY1 is closed. Reverse contact RY2
Is a normally open contact provided between the common connection point P1 and a subsequent position (connection point P3) of the ascending push button switch 10 of the open-side circuit.

The relay control unit 27 includes each relay contact RY
Two sensing relays (not shown) respectively corresponding to 1 and 2 are provided. Then, under the control of the signal determination unit 26, the relay control unit 27 switches the relay contacts RY1, RY2 at the timing described later. The relay control unit 27 performs a relay control at the time of detecting an obstacle and a relay control at the time of malfunction of the obstacle detection device.

The voltage monitoring unit 28 monitors the operating state of the lower limit switch 21 with a voltage derived from a part of the connection line 23 connecting the control means 3 and the failure time control unit 2b. As shown in FIG. 2, the connection terminal P of the failure time control unit 2b
5 is a common control (power supply) of the control circuit of the opening / closing control means 3
The connection terminal P7 is connected to the line P1, and is connected to a preceding stage position P8 of the lower limit switch 21 of the closed circuit. Thus, when the lower limit switch 21 is operated (opened), the voltage between the connection terminals P5 and P6 is not applied, and at this time, the voltage monitoring unit 28 outputs an operation signal to the signal determination unit 26.

The operation detecting section 29 is similarly derived from a part of the connection line 23 and detects the operating state of the operating section PBS by voltage. The voltage at the connection terminals P5 and P6 of the failure-time controller 2b (relay controller 26) is detected. Connection terminals P5, P6
Are connected to common control (power) lines P1 and P4 of a control circuit of the opening / closing control means 3 via a stop push button switch 16. When the stop push button switch 16 is pressed, the voltage between P1 and P4 changes to a state without voltage.
The operation detecting section 29 detects that the stop push button switch 16 has been pressed based on the change in the voltage, and outputs a detection signal to the signal determining section 26.

The stop push button switch 16 is used for stopping the ascending / descending when the shutter is normally opened and closed. However, when the signal judging section 26 is in the self-hold release state and the relay contact RY1 is open, the shutter is not operated. It is used as a return key for returning the operation to the initial state. That is, in the self-hold release state, when the stop push button switch 16 is pressed, the operation detection unit 29
It detects that the voltage between 1 and P4 becomes 0 and outputs a detection signal. In response to this, the signal determination unit 26 performs control to release the self-hold release state and return to the initial state, and the relay contact RY1 of the relay control unit 27 is closed.

The processing at the time of malfunction of the obstacle sensing device having the above configuration will be described with reference to the flowchart of FIG. In the initial state, the relay contact RY1 is in a closed state, and the flag is 0 (SP1). However, when the obstacle sensing device breaks down, that is, when the battery of the transmitter 2a runs out or when the sensing mechanism malfunctions, even if the shutter seat comes into contact with the floor surface when the shutter is lowered, the transmitter 2 No sensing signal is transmitted from 2a, and the shutter continues to descend without stopping on this floor.

Thus, the lower limit switch 21
Is activated (SP2-Yes), and upon receiving an activation signal from the voltage monitoring unit 28, the signal determination unit 26 determines that the obstacle sensing device is malfunctioning and sets a flag to 1 (SP3). The signal determination unit 26 determines whether the flag is set to 1 (S
(P4-Yes) sets the shutter opening and closing via the relay control unit 27 to a state different from the normal state. Specifically, the self-holding release control is performed on the relay control unit 27, and the relay contact R
Open Y1 (SP5) and open / close push button switches 10, 13
Is released (SP25). This allows
The energization to the self-holding relay contacts 18 and 19 is cut off, and the lowering of the shutter stops.

In the self-holding release state, the self-holding relay contacts 18 and 19 are not energized by operating either the ascending push button switch 10 or the descending push button switch 13. Therefore, during the self-hold release state, when the ascending push button switch 10 / or the descending push button switch 13 is operated, the ascending relay contact 11 / or the closing relay contact 14 is energized only during the pressing, and The shutter moves up / down in the same direction via the switch M.

By controlling the opening / closing of the shutter to the self-hold release state when the operation of the obstacle sensing device is defective, continuous opening / closing is not performed even when the shutter is opened / closed. , 13, the shutter is opened and closed only while pressing
The operator can notify the malfunction of the obstacle sensing device by operating the shutter differently from the normal operation. At this time, regardless of the presence or absence of the notification in the notification unit 30,
An operation failure of the obstacle sensing device can be notified by the operation state of the shutter.

As described above, during the period in which the signal detection unit 26 determines that the obstacle sensing device is malfunctioning (the period in which the flag is 1), the notification unit 30 notifies an abnormal state to the outside (SP6). Specific examples of the notification include buzzer sounding and lamp lighting.

Thus, the operator is notified of the malfunction of the obstacle sensing device, and can perform inspection of the obstacle sensing device, for example, malfunction of the seat plate, malfunction of the sensing switch, or battery inspection of the transmitter 2a. The obstacle sensing device can be returned to normal operation. A state in which the obstacle sensing device does not output a sensing signal in a state of malfunction (SP)
7-No), and when the operator presses the stop pushbutton switch 16 for resetting the operation (SP8-Yes), the flag is set to 0.
Clear (SP9). Further, even if the operator pushes down the stop pushbutton switch 16 for resetting the operation after the obstacle sensing device is inspected and returned to the normal state (SP8-No), the shutter is opened and closed thereafter. When a sensing signal is output while touching an obstacle during operation (SP7-Yes),
The flag is cleared to 0 (SP1
2).

When the flag is cleared to 0, SP
Via 4-No, the relay contact RY1 is closed (SP1
0), the abnormal state is released (SP11). That is, the signal determination unit 26 releases the self-holding release state and returns to the self-holding state. Further, the notification from the notification unit 30 is released.

Next, normal processing will be described. When the shutter is closed, when the shutter comes into contact with the floor, the obstacle detection device detects the floor, so the lower limit switch 21 is inactive (SP2-No), and the flag remains at 0. (SP4-No), relay contact RY
1 is kept in a closed state (SP10). Also,
SP has not been issued since then
The processing in 11 is not substantially executed.

When the shutter comes into contact with an obstacle during the lowering of the shutter, a sensing signal is transmitted from the transmission unit 2a of the obstacle sensing device, and the signal determination unit 26 determines that the obstacle is in contact (SP7). -Yes), perform safety control to reverse the shutter after stopping. In this safety control, first, the relay contact RY1 is switched and opened to release self-holding. As a result, the power supply to the self-holding relay contacts 18 and 19 is interrupted, and the lowering of the shutter is stopped.

Next, the relay contact RY2 is switched and closed. As a result, the opening relay contact 11 is energized via the relay contact RY2, and the shutter starts to rise. The relay contact RY2 is kept closed for a period set in advance by a timer or the like, and returns and opens after the elapse of this period. During this period, the shutter rises and stops at a position separated from the obstacle by a predetermined distance. Thereafter, the relay contact RY1 is switched to return to the closed state.
When the relay contact RY1 is restored, the shutter does not move in any of the upward and downward directions.

Thereafter, if the lower push button switch 13 is operated in a state where the obstacle is removed, the shutter can be lowered again. In the above operation, the reversal control is performed when the shutter comes into contact with the obstacle.
Y1 may be opened and only the stop control may be performed. In the subsequent processing, the flag is maintained at 0 (SP1).
2).

In the above configuration, the failure time control unit 2b is connected to the control circuit of the switching control means 3 via the connection line 23. Even if the internal configuration of this control circuit is not changed, the existing switching control circuit can be used. 3, the shutter opening / closing operation corresponding to the malfunction of the obstacle sensing device can be performed. Further, since the stop push button switch 16 is used as a return key for restoring self-holding and a voltage change due to the operation of the stop push button switch 16 is detected, there is no need to provide a special reset key.

The opening / closing control means 3 and the failure-time control section 2b described in the above embodiment are composed of an MPU, a ROM, a RAM, etc., and execute predetermined processing upon receiving an input signal in accordance with a processing program stored in advance. A configuration for outputting a signal may also be employed. As a specific configuration example, a drive power supply for operation is directly connected to the switchgear M, and the switchgear M operated by a drive signal input separately from the power supply is used. In this example,
The rotation of the switch M is controlled by the content of the drive signal output from the switch control means 3. When the drive signal is the power supplied to the switch M, the opening / closing control means 3 controls the supply of power corresponding to the rise / fall, and shuts off the power when the drive signal is stopped. Becomes

Further, in the above-described embodiment, when the operation of the obstacle sensing device is malfunctioning, the control for moving in the same direction is performed only while the up / down switch of the operation unit PBS is pressed, but the present invention is not limited to this. Instead, when the up / down switch is pressed, the relay contact RY1 is closed for a predetermined amount (predetermined time), and the relay contact RY1 moves in the same direction and stops again.

[0046]

According to the present invention, the lower limit detection means detects the shutter at a position below the floor surface, and the failure control unit determines that the operation of the obstacle detection device is defective when the lower limit detection means operates. Since the shutter is controlled to open and close differently from the normal operation and the operation of the shutter itself notifies the operator of the malfunction of the obstacle sensing device,
It becomes easier to convey the operation failure state more clearly. In addition to such a configuration, it is easier to convey the malfunction of the obstacle detection device by combining it with the existing screen display and notification sound,
Whenever an obstacle is detected, the shutter can be controlled to the safe side. When the shutter is continuously moved up and down by self-holding the opening / closing operation of the operation unit by the opening / closing control means having a self-holding relay contact, when the opening / closing control means has a failure via a connection line, By simply connecting the control unit, the self-holding state can be held in the released state when the obstacle sensing device malfunctions. This allows the operator to open and close the shutter only while the operation button for opening and closing is being pressed, thereby notifying the malfunction state. And
The failure control unit may be configured to include a voltage monitoring unit and an operation detection unit that detect the operation of the lower limit detection unit and a voltage change when the stop pushbutton switch is operated, respectively.
Self-holding can be restored using the existing stop pushbutton switch, and shutter opening and closing can be returned to the initial state. Further, after the obstacle sensing device returns to the normal state from the defective state by the operator or the like after the operation failure state,
The failure time control unit can clear the memory of the operation failure state by receiving the sensing signal from the obstacle sensing device, and can easily return to the initial state.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a shutter obstacle sensing device according to the present invention.

FIG. 2 is a circuit diagram showing a connection configuration of an opening / closing control unit and a receiving unit.

FIG. 3 is a flowchart showing the operation of the apparatus.

[Explanation of symbols]

2a: transmitting section, 2aa: voltage detecting section, 2b: defective control section, 3: opening / closing control means, 13: lowering push button switch, 1
4 ... Close relay, 16 ... Stop push button switch, 21 ...
Lower limit switch, 23 connection line, 25 receiving circuit, 26 signal determination unit, 27 relay control unit, 28 voltage monitoring unit, 29 operation detection unit, 30 notification unit, RY1
Self-holding release relay contact, RY2 ... Reversal relay contact, PBS ... Operation part.

Claims (6)

[Claims] 1. An operation unit for performing a shutter opening / closing operation, an obstacle sensing device that outputs a sensing signal when an obstacle comes into contact with a shutter, and a shutter moved to a position corresponding to a position below a floor surface. A lower limit detecting means for detecting that the obstacle detecting device is malfunctioning when the lower limit detecting means detects the malfunction, stores the state of the malfunction and stops the shutter, and the stored value indicates the operation. A defect control unit that opens and closes the shutter in a state different from a normal state even when the operation unit is opened and closed during the period in which the operation state is in the defective state. . 2. The obstacle sensing device according to claim 1, wherein the failure time control unit receives the sensing signal from the obstacle sensing device and controls at least a stop of the shutter to secure opening and closing of the shutter. apparatus. 3. The shutter according to claim 1, wherein the malfunction control unit notifies the malfunction state to the outside via a notification unit when the malfunction detection unit determines that the obstacle sensing device is malfunctioning. Obstacle sensing device. 4. The failure time control unit, after determining that the obstacle sensing device is malfunctioning, when receiving a sensing signal from the obstacle sensing device, clears a memory indicating the malfunction state, 2. The shutter obstacle sensing device according to claim 1, wherein the shutter is opened and closed in a normal state by determining that the shutter is normal. 5. An ascending / descending / shuttering operation for opening / closing a shutter.
An operation unit provided with each push button switch for stopping, an obstacle detection device that outputs a detection signal when an obstacle comes in contact with the shutter, and detection that the shutter has moved to a position corresponding to a position below the floor surface An open / close switch having a self-holding relay contact for continuously self-holding and supplying power for driving the switch in the direction of the operation based on an operation of a push button switch for raising or lowering the operation unit, Control means, and a self-holding release relay contact connected to a self-holding relay contact of the opening / closing control means via a connection line and capable of supplying / interrupting power supply to the self-holding relay contact, A failure control section that opens the self-holding release relay contact when the lower limit switch is detected and holds the self-holding state in the released state. Obter's obstacle detection device. 6. The failure time control unit includes a voltage monitoring unit connected to the opening / closing control unit for detecting an operation state of the lower limit switch by a voltage change, and an operation state of a stop push button switch of the operation unit. An operation detection unit that detects by a voltage change; in the self-holding release state, receiving the operation of the stop push-button switch, closing the self-holding release relay contact, and performing the subsequent operation of the up / down push-button switch The shutter obstacle detection device according to claim 5, wherein the shutter obstacle detection device is configured to be able to hold the obstacle.