JPH03212186A - Motor curtain drive unit - Google Patents

Abstract

PURPOSE:To enable restart of curtain operation immediately after stoppage by connecting a normal open switch, interlocked with a power switch, across the input voltage terminals of a speed control circuit performing constant speed control and preventing abrupt start. CONSTITUTION:When an operating switch SW2 is turned ON, a logic control circuit 4 closes a power switch SW1 while opening a normal close switch SW3 thus switching a relay R1. Consequently, an AC voltage Va is rectified D1 and smoothed C1 thus producing a DC voltage Vb. A control power supply circuit 2 converts the voltage Vb into a control voltage Vcc which is then fed to a speed control circuit 3. Output from the circuit 3 controls the input voltage Vb to the voltage control circuit 1 so as to perform constant speed operation of a motor M, which is prevented against abrupt starting and subjected to forward/reverse rotation through the relay R1. Output from an encoder E is fed back to the speed control circuit 3. Upon turn OFF of the switch SW2, the switch SW3 is closed to drop the control voltage Vcc abruptly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electric curtain drive device that controls opening and closing of curtains using a switch or the like.

[Prior art] When opening and closing curtains at a desired speed using a motor,
The curtain opening/closing speed is affected by curtain weight and power supply voltage fluctuations, so some kind of constant speed control is required. In addition, under normal constant speed control, the curtain quickly reaches the set speed and starts suddenly, which may cause discomfort to the scratcher. Therefore, after the start signal is input, the voltage value that determines the set speed is gradually changed by an integrating circuit using a capacitor and a resistor, so that the set speed gradually increases with time.

FIG. 3 shows an overall block circuit diagram of a conventional electric curtain drive device. The switch SW1 is for turning on and off the commercial power supply AC, and the operation switch SW2 is for opening and closing the curtain. The AC input voltage Va of the commercial power supply AC is rectified by a rectifier and smoothed by a smoothing capacitor CI to obtain a rectified and smoothed voltage Vb. The voltage control circuit 1 voltage-controls the rectified and smoothed voltage Vb and converts it into a voltage applied to the motor M.

The control power supply circuit 2 steps down and stabilizes the rectified and smoothed voltage vb, and supplies the speed control circuit 3 with a control power supply Vcc.

Motor M rotates forward by relay circuit R1.

The curtains are opened and closed by being reversed. Furthermore, motor M
is built into the curtain rail. The speed of the motor M is detected by an encoder E constituting a speed detection circuit, and its output is input to the speed control circuit 3. The speed control circuit 3 applies a corresponding signal to the voltage control circuit 1 to control the voltage applied to the motor M.

The logic control circuit 4 receives the signal from the operation switch SW2 and performs on/off control of the switch SW1 and switching control of the relay circuit R3.

The operating switch SW2, logic control circuit 4, etc. constitute opening/closing control means, and the speed control circuit 3, voltage control circuit 1, etc. constitute constant speed control means and sudden start prevention control means.

[Problems to be Solved by the Invention] Generally, the rectified and smoothed voltage Vb is about 5 to 15 V for the DC 140V control power supply Vee, and the above conventional example is as follows.
After the power is turned off, the control power supply Vcc does not start dropping until the rectified smoothed voltage Vb drops to the control power supply Vec, so it takes time from the power supply stop by the power on/off switch SW until the control power supply Vcc drops. .

FIG. 4(a) shows the on/off state of the switch SW, FIG. 4(b) shows the drop in the rectified and smoothed voltage vb from the time when the switch SW is turned off, and FIG. 4(c) shows the voltage This shows a state in which the control power supply Vcc is decreasing after vb reaches Vcc. Therefore, when starting the curtain immediately after stopping, as shown in Fig. 4, the control power supply V
It takes time t for ce to fall, so if the curtain is started again during that time, the capacitors used for the integrating circuit in the speed control circuit 3 and the capacitors for stabilizing the control power supply are completely discharged. As a result, there was a problem in that the speed data held by the speed subwriting circuit 3 was inconsistent with the actual speed data, resulting in abnormal operation.

The present invention has been provided in view of the above-mentioned points, and an object of the present invention is to provide an electric curtain drive device that operates the curtain gently and quickly even if the curtain is started again immediately after the curtain is stopped. It is.

[Means for Solving the Problems] The present invention has a normally closed switch connected to both ends of a drive power supply applied to a constant speed control means and a sudden start prevention control means, which are interlocked with a power on/off switch. It is.

[Function] Therefore, when the power is cut off using the power on/off switch, the normally closed switch also returns and closes in conjunction with the switch, so that the voltage of the drive power supply drops quickly. I have to.

[Embodiments] Two embodiments of the present invention will be described below with reference to the drawings. 1st
FIG. 2 shows a block circuit diagram of an embodiment of the present invention, and FIG. 2 shows an operating waveform diagram of the main parts.

The basic configuration of this embodiment is the same as that of the conventional example, so
In the following explanation, the gist of one embodiment will be explained.

In the present invention, as shown in FIG. 1, a normally closed switch SW3 is connected to both ends of the output of the control power supply circuit 2, and the operation of this switch SWs is controlled by the power on/off switch SW,
It is linked with That is, as shown in FIGS. 2(a) and 2(b), before turning on switch SW,
The logic control circuit 4 controls the switch SW's so that there is a time difference so that the switch SW's is turned on after a time t2 after the switch SW+ is turned off and the switch SW's is turned off.

As a result, when the curtain stops and the power is cut off, the remaining control power supply voltage Vce is short-circuited by the switch SW3, and the rectified and smoothed voltage Vb (see Fig. 2) is short-circuited by the switch SW3.
Regardless of C)), the battery will be discharged quickly as shown in FIG. 2(d). Then, the integrating circuit and stabilizing capacitor in the speed control circuit 3 are quickly discharged.

Therefore, the time t2 is much shorter than the time 1+(FIG. 4(a)) required for the speed control circuit 3 to reset in the conventional example.
The circuit state returns to the initial state, and even if the curtain is started immediately after the curtain is stopped, the curtain is opened and closed quickly and gently again. I can do two things.

[Effects of the Invention] As described above, the present invention has a normally-closed switch connected to both ends of the drive power applied to the constant speed control means and the sudden start prevention control means, which is interlocked with a power on/off switch. Therefore, when the power is cut off using the power on/off switch, the normally closed switch also returns and closes in conjunction with the switch, allowing the voltage of the drive power source to drop quickly. Even when the curtain is restarted immediately after it has been stopped, the curtain can be started to operate quickly and slowly.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram of an embodiment of the present invention, FIG. 2 is an operational waveform diagram of the same, FIG. 3 is a block circuit diagram of a conventional example, and FIG. 4 is an operational waveform diagram of the same. SW is a power on/off switch, SW3 is a normally closed switch, and M is a motor.

Claims (1)

[Claims] (1) A motor that drives the curtain to open and close, is built into the curtain rail, and is forced to stop while power is applied when the curtain is completely opened or closed. An opening/closing means for opening, closing, and stopping the curtain; a constant speed control means for detecting the opening/closing speed of the curtain and opening/closing the curtain at a set constant speed; and a sudden start prevention control means for smoothly starting the curtain. The electric curtain drive device is characterized in that a normally closed switch that is linked to a power on/off switch is connected to both ends of the drive power applied to the constant speed control means and the sudden start prevention control means. Electric curtain drive device.