JPH09137683A - Opening/shutting controlling device for electric-powered shutter - Google Patents

Abstract

PURPOSE: To certainly stop the lower end of a shutter at a position of complete closure. CONSTITUTION: As a DC motor 58 is stopped with a shutter closed completely, a take-up shaft is turned in reverse with rotative reaction force of a coil spring worked. Then, the DC motor 58 is made to serve as a generator by reverse rotation interlocking with the take-up shaft. Electric current produced by generated electricity flows through a resistor R9 arranged in parallel in a drive circuit 4, and thereby braking power against reverse rotation of the DC motor 58 works, restraining the rotative reaction force of the coil spring, and the take-up shaft turns slowly in reverse and the shutter is wound up. As the reverse turning stops at a moment when the rotative reaction force of the coil spring wound back by the reverse turning of the take-up shaft and the weight of the shutter suspended with its slats extended by winding-up are balanced, the lower end of the shutter stops certainly at a position of complete closure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing control device for a residential electric shutter.

[0002]

2. Description of the Related Art A shutter which can be wound and has slats connected thereto and a coil spring which generates a rotational reaction force substantially balanced with the weight of the shutter portion which is hung down when it is extended are mounted so that it can be rotated by a substantially constant torque. The electric shutter including the winding shaft and the DC motor that rotates the winding shaft in the forward and reverse directions flows to the DC motor when the DC motor continues to rotate even when the lower end of the shutter reaches the fully closed position. The load current increases. Therefore, when the load current becomes equal to or higher than a predetermined set value, the electric shutter opening / closing control device is configured to perform the stop control of the shutter at the fully closed position by cutting off the energization and stopping the DC motor. is there.

[0003]

However, since the shutter unreeled from the take-up shaft hangs down and extends, the load current of the DC motor does not immediately increase even when the lower end of the shutter reaches the fully closed position. When the load current increases, the DC motor stops when the extended portion is pushed in due to the rotation between the connected slats or the bending of the entire shutter. At this time, the coil spring mounted on the winding shaft is in a state of being maximally wound and the weight of the shutter is not directly acting.

Therefore, when the DC motor is stopped, the rotational reaction force of the coil spring momentarily acts, the winding shaft is swiftly reversely rotated to wind up the shutter, and the shutter is rotated between the slats to be curved. In addition to extending the shutter, the lower end of the shutter may be pulled up from the fully closed position, which causes a problem that the shutter is not fully closed. On the other hand, it is possible to short-circuit the DC motor at the time of stop to increase the braking force and prevent reverse rotation, but it is not possible to cancel the short-circuit because it stops in the state where the rotational reaction force of the coil spring acts. Therefore, there is a problem that manual opening and closing becomes impossible and it is not practical. The present invention has been made in order to solve the above problems, and an object of the present invention is to provide an opening / closing control device for an electric shutter that can reliably stop the lower end of the closed shutter at the fully closed position.

[0005]

In order to achieve the above object, an opening / closing control device for an electric shutter according to the present invention is approximately balanced with a retractable shutter having slats connected thereto and a weight of the shutter portion that hangs down as it is extended. A coil spring that generates a rotational reaction force is attached to the winding shaft, which is rotatable by a substantially constant torque, a DC motor that rotates the winding shaft forward and backward, and a drive circuit for the DC motor. An opening / closing control device for an electric shutter, comprising: a DC motor control circuit configured to stop the DC motor by stopping energization to the drive circuit when a load current of the DC motor exceeds a predetermined set value. The lower end of the shutter is pushed to the fully closed position, and the DC motor stopped due to interruption of power supply to the drive circuit causes rotation of the coil spring. A resistor that consumes power generated by the reverse rotation by the force, characterized in that interposed in parallel to the drive circuit.

Further, in the opening / closing control device for the electric shutter having the above-mentioned structure, a cutoff delay means may be provided for cutting off the drive circuit after a lapse of a predetermined time after the DC motor is stopped.

[0007]

According to the above-described electric shutter opening / closing control device, the DC motor stopped by the lower end of the shutter being pushed to the fully closed position and the drive circuit being de-energized is stopped by the rotational reaction force of the coil spring. Generates power by rotating in reverse.
Then, the current flows through the resistor interposed in parallel with the drive circuit. Therefore, a braking force acts on the reverse rotation of the DC motor, a sudden action of the rotation reaction force of the coil spring is suppressed, the winding shaft slowly rotates in the reverse direction, and the shutter is wound, and the gap between the slats is reduced. The reverse rotation stops when the weight of the extended and supported shutter balances with the rotational reaction force of the unwound coil spring, so the lower end of the shutter is not pulled up from the fully closed position and the lower end of the shutter is This has the effect of reliably stopping at the fully closed position. Also,
Since the shutoff delay means for shutting off the drive circuit is provided, the drive circuit is shut off after a predetermined time elapses, and the shutter can be manually opened / closed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electric shutter opening / closing control device according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic front view of the electric shutter device 50. The shutter 51 is formed by connecting the slender slats 52 in order and rotating in the length direction (winding direction) or extending / contracting somewhat. Then, it is guided by the frame members 53, 53 in the width direction and hangs down to the front surface of the window or the open surface, and the lower end 51a reaches the lower horizontal frame member 54 and is fully closed. One end of the shutter 51 is fixed to a winding shaft 56 provided in a winding case 55 provided at the upper ends of the frame members 53 in the width direction. Coil springs 57, 57 are attached to the winding shaft 56, and are wound as the shutter 51 is fed out, and a rotational reaction force that approximately balances the weight of the hanging portion of the shutter 51 is generated. As a result, the winding shaft 56 is rotated with a substantially constant torque. The winding shaft 55 is normally and reversely rotated by a DC motor 58.

FIG. 2 is a control circuit diagram of the DC motor 58. A shutter lowering switch 11 or a shutter raising switch 1 is composed of a microcomputer or the like.
2 is a control command circuit for controlling the forward / reverse rotation of the DC motor 58 according to the operation of 2. Then, in the control command circuit 1,
The load current of the DC motor 58 detected by the current detector 13 provided in the DC power supply circuit 2 is input. Reference numeral 3 denotes a drive circuit 4 of the DC motor 58 for rotating the DC motor 58 in the forward and reverse directions or stopping it in response to a command from the control command circuit 1.
An energization control circuit for switching the energization direction to or disconnecting energization, including transistors Q1 to Q6 and a resistor R1.
~ R8.

The drive circuit 4 includes a DC motor 58, a noise filter 14, a resistor R9, and diodes 15 and 16 connected in opposite directions, which are connected in parallel with each other. The drive circuit 4 is connected between the transistors Q3 and Q5 and the transistor Q5.
It is connected between 4 and Q6. Further, the drive circuit 4 is provided with a relay contact 17 in series with the DC motor 58.
A relay coil 18 for activating the relay contact 17 is connected in parallel with the electrolytic capacitor 19 and is connected between the diode 15 and the diode 16 and the ground.

Next, the operation of the control circuit of the DC motor 58 of the present embodiment having the above structure will be described. First, when the shutter lowering switch 11 is pressed, the transistor Q1 is turned on by the command of the control command circuit 1, and the transistor Q3 is turned on.
And the transistor Q6 is turned on. Then, the electric charge is accumulated in the electrolytic capacitor 19 via the diode 15, and the relay coil 18 is energized, so that the relay contact 1
7 is turned on, and the drive circuit 4 of the DC motor 58 is closed. The direct current motor 58 is rotated forward by the current flowing in the drive circuit 4 in the direction of the arrow a, and the winding shaft 56 moves to the shutter 51.
Is taken out and the coil springs 57, 57 are wound.
Then, the rotational reaction force of the coil springs 57, 57 and the weight of the hanging portion of the shutter 51 are substantially balanced.

Even after the lower end 51a of the shutter 51 reaches the horizontal frame member 54, the slat 52 is pushed and rotated to cause contraction and the DC motor 58 continues to rotate. When the shutter 51 cannot be extended, the DC motor 58 becomes overloaded and the load current increases. This increase in load current is fed back to the control command circuit 1 by the current detector 13. When the load current exceeds a predetermined set value, the control command circuit 1 turns off the transistor Q1. When the transistor Q1 is turned off, the transistors Q3 and Q6 are turned off, the DC power supply circuit 2 is cut off, and the DC motor 58 is stopped. When the DC power supply circuit 2 is disconnected, the electrolytic capacitor 19
Since the electric charge is discharged from the device and the relay coil 18 is energized, the relay contact 17 continues to operate and the drive circuit 4 is not interrupted.

When the DC motor 58 is stopped, the coil springs 57, 57 of the winding shaft 56 are in a state of being maximally wound and the weight of the shutter 51 is not directly acting. Therefore, the rotational reaction force of the coil springs 57, 57 momentarily acts, and the winding shaft 5
Rotate 6 in reverse. The DC motor 58 becomes a generator by reverse rotation that is interlocked with the take-up shaft 56 to generate electric power, and a current based on the generated electric power flows through the resistor R9 interposed in parallel with the drive circuit 4.

Therefore, the braking force against the reverse rotation of the DC motor 58 acts, the rapid reaction of the rotational reaction force of the coil springs 57, 57 is suppressed, and the winding shaft 56 slowly rotates backward and the shutter 51 is opened. Get involved. The reverse rotation is stopped when the rotational reaction force of the coil springs 57, 57 unwound by the reverse rotation and the weight of the shutter 51 part which is caught and extends between the slats 52 and is balanced with each other are stopped. The lower end 51a of 51 is not pulled up from the horizontal frame member 54 at the fully closed position, and no gap is created between the lower end 51a and the horizontal frame member 54.

When the charge accumulated in the electrolytic capacitor 19 is completely discharged, the relay contact 17 is turned off and the drive circuit 4 is cut off, so that the braking force by the rotation of the DC motor 58 does not act. Further, since the weight of the hanging portion of the shutter 51 and the rotational reaction force of the coil springs 57, 57 are substantially balanced, the shutter 51 can be opened and closed manually. The braking force can be adjusted by setting the resistance value of the resistor R9 to a predetermined value. Moreover, the time until the drive circuit 4 is cut off can be adjusted by the capacitance of the electrolytic capacitor 19.

When the shutter raising switch 12 is pressed,
The transistor Q2 is turned on and the transistors Q4 and Q5 are turned on in response to the command from the control command circuit 1. Then, through the diode 15, the electrolytic capacitor 1
9, the electric charge is accumulated in the relay coil 18, the relay coil 18 is energized, the relay contact 17 is turned on, and the DC motor 58
Drive circuit 4 is closed. Arrow b flowing through the drive circuit 4
The direct current motor 58 is reversely rotated by the current in the direction, the shutter 51 is wound around the winding shaft 56, and the coil springs 57, 5
7 is rewound. The lower end 51a of the shutter 51
When the shutter reaches the fully opened position, the shutter 51 is stopped by a stopper (not shown). Due to the increase in the load current of the DC motor 58, the energization control circuit 3 is cut off and the DC motor 58 is stopped. At this time, the coil springs 57, 57 are
The shutter 5 is almost rewound and
There is almost no hanging part of 1.

As described above, in this embodiment, the DC motor 5
8 by interposing the resistor R9 in parallel with the drive circuit 4 of FIG. 8, the lower end 51a of the shutter 51 can be surely stopped at the fully closed position, and the cutoff delay means of the drive circuit 4 is also the electrolytic capacitor 19 and the relay contact 17. Since the relay coil 18 and the relay coil 18 are used, there is an advantage that the circuit configuration is not complicated and the cost is advantageous.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an electric shutter device.

FIG. 2 is a control circuit diagram of a DC motor.

[Explanation of symbols]

 1 Control Command Circuit 3 Energization Control Circuit 4 Drive Circuit 13 Current Detector 17 Relay Contact 18 Relay Coil 19 Electrolytic Capacitor 50 Electric Shutter Device 51 Shutter 51a Lower End 52 Slat 54 Horizontal Frame Member 56 Winding Shaft 57, 57 Coil Spring 58 DC Motor

Claims (2)

[Claims] 1. A windable shutter having slats connected thereto, and a coil spring for generating a rotational reaction force that approximately balances with the weight of the shutter portion that is hung down when it is moved out are attached to the shutter so that the shutter can rotate with a substantially constant torque. And a DC motor that rotates the winding shaft in the forward and reverse directions,
And a DC motor control circuit for switching the drive circuit of the DC motor, and when the load current of the DC motor exceeds a predetermined set value, shuts off energization to the drive circuit to stop the DC motor. In the opening and closing control device for an electric shutter, the lower end of the shutter is pushed to a fully closed position, and the DC motor stopped due to interruption of power supply to the drive circuit is reversely rotated by a rotational reaction force of the coil spring. An opening / closing control device for an electric shutter, wherein a resistor that consumes generated power is provided in parallel with the drive circuit. 2. The opening / closing control device for an electric shutter according to claim 1, further comprising a shut-down delay unit that shuts off the drive circuit after a lapse of a predetermined time after stopping the DC motor.