JP2638486B2 - Electric shutter control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit for an electric shutter for controlling opening and closing of an electric shutter.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing a wiring structure of a general electric shutter. The switch 50 is connected to a power supply via a power supply line 51. Further, the drive is operated by the push button switch 52 via the push button wire 53. This switchgear 50
Is provided with an open / close control unit on the signal input side, determines the state of the push button switch 52, and controls the open / close of the electric motor. Further, a gear mechanism is provided on the rotating shaft on the mechanical output side, is connected to a winding shaft 55 for winding the shutter, and the shutter is opened and closed by driving the switch 50. The upper and lower limit positions of the shutter are detected by the limit device 56 on the side of the switch 50, and the drive of the switch 50 is stopped at the upper and lower limit positions.

Some electric shutters are provided with a safety device for opening and closing. FIG. 5 is a diagram showing a wiring structure when a safety device is retrofitted to the electric shutter.
As shown in the figure, the draining plate 58a at the lower end of the shutter 58 has
An obstacle detection unit 59 is provided. This obstacle detection unit 59
Is composed of a seat plate that moves in contact with an obstacle, and a microswitch that electrically detects the movement of the seat plate. When the obstacle detection unit 59 detects an obstacle while the shutter 58 is descending, the obstacle detection unit 59 receives a light signal from the transmitter 60 and the like, and
1 is configured to wirelessly transmit an obstacle detection signal.

The safety device 65 is installed in a shutter case, and receives an obstacle detection signal from the light receiving unit 61. The safety device 65 is configured to stop and raise (touch up) the shutter 58 when an obstacle is detected when the shutter 58 descends. By the way, in the conventional safety device 65, when the shutter is fully closed, the safety device 65 is intentionally used.
When the is operated many times, there is a security problem that touch-up is performed each time, and the shutter 58 is raised to enable intrusion.

For this reason, the safety device 65 includes a shutter 58
Is performing a touch-up operation only during the closing operation and when an obstacle is detected. For this purpose, it is necessary to detect a signal that the shutter 58 is closing. Therefore, the voltage detecting circuit 67 of the safety device 65 includes a voltage application line portion in the falling state from the push button line 53,
The voltage application points at both ends of the lower limit contact are derived and input from the limit connection line 56a of the limit device 56, and the actual lowering state of the switch 50 is detected therefrom. .

[0006]

Therefore, when retrofitting the above-mentioned safety device 65, the point A where the branch connection is made at an intermediate position of the push button line 53 and the limit connection line 56a
A branch point B occurs at an intermediate position in the above, and it is necessary to newly provide connection lines 68 and 69 between these and connect the safety device 65. In this operation, it is necessary to temporarily cut a required wire out of each wire bundle and then to perform crimp connection using a sleeve, which is troublesome, and there is a problem that the wire is easily drawn out. Therefore, when the safety device 65 is retrofitted as an option, the construction is particularly troublesome and the cost is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and the safety device is configured to perform a touch-up only once when an obstacle is detected, regardless of whether the shutter is operating or stopped. It is an object of the present invention to provide a control device for an electric shutter that can prevent the safety device from being installed, and can easily and easily install the safety device without installing the safety device.

[0008]

In order to achieve the above-mentioned object, a controller for an electric shutter according to the present invention raises the shutter when an obstacle is detected by an obstacle detecting section 59 when the shutter 58 descends. In a control device for an electric shutter, a switch 5 for opening and closing the shutter
A motor operation current detection circuit 2 for detecting the operation of the motor 0 by a power supply current, and after the obstacle is detected by the obstacle detection unit, the shutter is controlled to rise only at a predetermined height and an obstacle is detected again. And a controller 5 for holding the rise in a prohibition state, canceling the rise prohibition by performing a shutter opening / closing operation by a push button switch 52 and detecting a current by the motor operating current detection circuit. And

[0009]

When an obstacle comes in contact with the shutter 58 while descending, the obstacle detection section 59 outputs a detection signal to the control section 5. The control unit 5 reverses the shutter-down state to the up state, and can easily remove the obstacle. Further, once the control unit 5 controls the ascending once, even if a detection signal is subsequently input from the obstacle detecting unit, the ascent is prohibited again. This prohibition of lifting is released only when the operator operates the push button switch 52 to open and close, so that it is possible to safely remove the obstacle and open and close the shutter 58 safely.

[0010]

FIG. 1 is a schematic diagram showing a control device for an electric shutter according to the present invention. In the figure, the same components as those described in the related art are denoted by the same reference numerals, and description thereof is omitted.

The safety device 1 according to the present invention is provided in a shutter case.
Power supply line 5 connecting between switchgear 50 and pushbutton switch 52
1, provided between the push button lines 53.

FIG. 2 is a block diagram showing the internal configuration of the safety device 1. As shown in FIG. The power supply line 51 is used for an operation power supply of the switchgear 50.
It is used for the operation of. Here, the current flowing through the power supply line 51 is always detected by the motor operating current detection circuit 2, and at the time of detection, a current detection signal S 1 is output to the control unit 5.

An obstacle detection signal S detected by the light receiving section 61
2 is input to the control unit 5. The control unit 5 is configured by a processor and performs a predetermined control process by a storage program stored in a storage unit (not shown). The control unit 5 stores the ON / OFF state of the touch-up completed flag in the touch-up storage unit 5a.

The control unit 5 outputs a stop signal S3 and a rise signal S4 to the rise signal output unit 6 and the stop signal output unit 7 during the touch-up operation. Each signal output part 6,7
Are constituted by relay contacts provided between the push button switch 52 and the switch 50, respectively. When the relay contacts are opened and closed by stop signals S3 and S4 from the drive relay in the control unit 1, the push button is opened. The switch 50 is stopped and raised regardless of the operation state of the switch 52.

Here, the push button switch 52 switches the switch 50
, The push button line 53 is composed of four lines. As shown in FIG. 2, the descending line 53 c and the common line 53 d are configured to simply pass through the safety device 1. Stop line 5
3b is connected via a normally closed relay contact 7a in the stop signal output unit 7. Further, the ascending line 53a is connected to the normally open relay contact 6a of the ascending signal output unit 6, one end of the relay contact 6a is led out to the ascending line 53a of the switch 50 via the lead wire 6b, and the other end is connected. It is connected to the stop line 53b.

Thus, at the time of normal opening and closing of the shutter, the shutter 58 is opened and closed by the opening and closing operation of the push button switch 52 in the open and closed state of the four push button wires 53. At this time, the relay contacts 6a and 7a One of them is opened and closed. On the other hand, at the time of a touch-up operation described later, the touch-up operation is performed only on the safety device 1 side irrespective of the operation of the push button switch 52, so that at the time of the touch-up operation, the relay contact 7a of the stop signal output unit 7 is opened. As a result, the stop line 53b on the switch 50 side is opened, and the shutter 58 is stopped.

The relay contact 6a of the rising signal output unit 6
Is closed and the lead-out line 6b is connected to the switchgear 50.
The stop line 53b is closed and the shutter 58 rises. For this reason, an opening / closing control unit (existing and not shown) provided at the input stage of the switchgear 50
The instantaneous open / close state of each of the lines 53a to 53d is determined, and a control signal in a corresponding direction is self-held and output by the electric motor.

This touch-up operation is performed according to the procedure shown in the flowchart of FIG. In the initial setting, the touch-up completed flag in the touch-up storage unit 5a is turned off (SP1). First, the control unit 5 determines whether or not the motor operating current detection circuit unit 2 has detected a current flowing through the power supply line 51 (SP2). When the current is detected, the touch-up completion flag in the touch-up storage unit 5a is turned off (SP3). If the current is not detected, the touch-up completed flag is not rewritten and held if it was previously ON.

If the obstacle detection signal S2 has not been input, the flow does not proceed to the touch-up operation and the following flow is not executed (SP4-NO). When the obstacle detection signal S2 is input, the process proceeds to the following touch-up operation (SP4-Yes). In the touch-up operation, first, the control unit 5 checks the state of the touch-up completed flag,
When it is in the OFF state (SP5-Yes), a stop signal S3 is output to the stop signal output unit 7 (SP6).

Thus, the relay contact of the stop signal output section 7 is opened to stop the switch 50. As a result, the shutter 58 that has been lowered until then is stopped at an intermediate position (SP7). Thereafter, the control unit 5 outputs the rising signal S4 to the rising signal output unit 6 for a predetermined time, closes the relay contact, and drives the switch 50 in one direction (SP8).
As a result, after the shutter 58 rises by a predetermined height (S
P9), the drive of the switch 50 is stopped (SP10). This predetermined time is an extremely short time such as an interval at which the draining plate 58 can be separated from the obstacle once sandwiched and the obstacle can be removed.

Then, the control unit 5 rewrites the touch-up completed flag to ON (SP11). As a result, information indicating that the touch-up operation has been performed this time is stored in the touch-up storage unit 5a.

Therefore, once the touch-up operation has been performed, the touch-up completed flag is ON, so that a person who intentionally attempts to intrude the obstacle detection unit 5 many times.
9, the current detection in SP2 is not performed, and it is identified that the touch-up completed flag is ON (SP5-No).
Only outputs the stop signal S3 to the
12), the switch 50 remains stopped (SP1)
3). Thus, after the touch-up operation is performed once, the shutter 58 is prohibited from being repeatedly opened, and can be prevented from being opened without being opened.

The touch-up operation is performed by the shutter 58
It is performed only once during descent and during stoppage,
Thereafter, the operation can be reset to the initial state only when it is detected that the switch 50 is operated by the operator by operating the push button switch 52. That is, the push button switch 52
Is operated to open and close the shutter 58, the motor operating current detection circuit 2 detects the current detection signal S1, and the current is detected (SP2).
-Yes), the touch-up completed flag can be rewritten to OFF. In this state, the touch-up operation is reset, and thereafter, only one touch-up operation is permitted again.

Here, when the push button switch 52 is installed outside, it is desirable that the push button switch 52 is housed in a box with a key or installed inside a warehouse so that an outside person cannot easily operate it.

The touch-up operation has been described as a serial operation in which, after the execution of the current detection operations SP2 and SP3, the touch-up operations SP4 to SP13 are executed for convenience of explanation. Since the current is detected by the operation, a flag process is performed to prevent a malfunction. That is, a step of fixing the touch-up completed flag in the OFF state between SP5 and SP6 is added, and after executing SP6 to SP10, the flag is released in SP11 and rewritten to the ON state.

Therefore, during the execution of SP6 to SP10, the touch-up completion flag is not rewritten to ON even if the current is detected in parallel with the opening / closing operation of the switchgear 50, and the touch-up operation is reliably performed. Can be executed.

The above-mentioned safety device 1 can be easily retrofitted to the already installed shutter shown in FIG. That is, the safety device 1 is provided at an intermediate position of the power supply line 51 from the power supply to the switchgear 50 in the state shown in FIG. Similarly, a push button wire 53 extending from the push button switch 52 to the switch 50 is provided at an intermediate position.

Therefore, when the safety device 1 is to be retrofitted, wiring can be performed only by cutting the power supply line 51 and the push button wire 53 at intermediate positions and connecting them via the safety device 1. Specifically, as shown in FIG. 2, the safety device 1 is provided with connection terminals 1A and 1a for input and output of the power supply line 51, respectively, and also has connection terminals 1B to 1E for input and output of the push button line 53.
1b to 1e are provided, and both ends of the disconnected power line 51 and push button line 53 are connected to these connection terminals 1A to 1E and 1a to 1a.
e only needs to be connected. This connection terminal is a screw terminal and can be easily connected with a driver or the like.

As a result, the conventional safety device 1 shown in FIG.
The work of branch connection between the two locations A and B, which was required when retrofitting, can be made unnecessary, and the connection wires 68 and 69 are not newly required, so that the wiring work can be remarkably facilitated and a wiring error occurs. Absent.

[0030]

According to the control apparatus for an electric shutter of the present invention, when an obstacle comes in contact with the shutter while it is descending, the shutter can be inverted up to a predetermined height only once to remove the obstacle. After the ascent control is performed, the ascent is prohibited again even if a detection signal is input from the obstacle detection unit, and the shutter may be fully opened even if the operation on the obstacle detection unit is performed multiple times intentionally. In addition, a security effect that can prevent intrusion of an outsider can be obtained. The prohibition state of the rise is released only when the motor operating current detection circuit detects a current when the switch is opened and closed by the internal operator operating the push button switch,
The security effect can be ensured, and the entire opening and closing of the shutter, including when an obstacle is detected, can be performed safely and reliably, and reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a control device for an electric shutter according to the present invention.

FIG. 2 is a block diagram showing an internal configuration of the safety device.

FIG. 3 is a flowchart showing a touch-up operation by the safety device.

FIG. 4 is a diagram showing a wiring structure of an electric shutter.

FIG. 5 is a diagram showing a wiring structure when a safety device is attached to the electric shutter.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Safety device, 2 ... Electric motor operation current detection circuit, 5 ... Control part, 5a ... Touch-up storage part, 6 ... Up signal output part
7 ... Stop signal output unit, 50 ... Switch, 51 ... Power line, 5
2 ... push button switch, 53 ... push button line, 59 ... obstacle detection unit, 60 ... transmitter, 61 ... light receiving unit.

Claims (1)

(57) [Claims] When a shutter (58) descends, when an obstacle is detected by an obstacle detection unit (59), an electric shutter control device that raises the shutter is provided. A switch (50) that opens and closes the shutter. Motor operation current detection circuit that detects the operation of the motor based on the power supply current (2)
After the obstacle is detected by the obstacle detection unit, the shutter is controlled to rise only at a predetermined height, and if the obstacle is detected again, the lift is held in a prohibited state, and the push button switch ( 52. A control circuit for an electric shutter, comprising: a control section (5) for canceling the rise prohibition by performing a shutter opening / closing operation according to 52) and detecting a current by the motor operating current detection circuit.