JPH0693781A - Blind with automatic slat angle control - Google Patents

Abstract

PURPOSE:To provide controllability for the slat angle with an accuracy within 1 deg.. CONSTITUTION:A slat angle controlling blind includes a shaft 12 to be rotated by a motor 11, rudder drum 13 mounted on the shaft so as to rotate in a single piece, a rudder cord 14 with the front and rear ends hitched at the drum 13 or a slat 15 supported by a rudder tape, a motor driver MD to drive the motor 11, and a control means to adjust the inclining angle of the slat 15 through controlling of the motor driver. In this automatic controlling blind for slat angle, the shaft 12 is furnished with a shaft encoder 20 equipped with a high resolution to sense the angular position of the shaft 12, and the resultant signal is fed to a microcomputer. The motor driver MD is controlled by the microcomputer for controlling the slat angle with as high an accuracy as within 1 deg., and the reference angular position of the shaft 12 is sensed a sensor 18, and the signal obtained is fed to the microcomputer for correcting the sensing signal of the encoder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved slat angle automatic control blind for automatically adjusting the tilt angle of the slat of a venetian blind by an electric motor.

[0002]

2. Description of the Related Art Blinds in which the slat inclination angle of a venetian blind can be automatically adjusted by an electric motor are known from Japanese Patent Publication Nos. 4-16587 and 4-16590. This known blind includes a slat rotating means for rotating a slat, an angle detecting means for detecting an angle of the slat, an instruction means for instructing opening / closing of the slat, and an angle detecting means for responding to the opening / closing instruction of the instructing means. And a control means for controlling the slat rotating means based on the detection output of the above to adjust the slit angle. The slat angle detecting means is composed of a slat angle detecting disc provided on the ladder winding drum, a number of slits provided on the slat angle detecting disc, and an angle sensor sandwiching the slit. Since the pitch angle of this slit is about 10 degrees, the detection accuracy of the slat angle is also 10 degrees.
It was about degree. Also, the known blind lacks means for compensating for the difference between the slat angle detected by the slat angle detection means and the actual slat angle.

[0003]

[Problems to be Solved by the Invention] An electric Venetian blind is installed inside a ventilation double-glazed window, and the slat angle is secured as much as possible from the window based on the solar radiation data of the sun. It is demanded to improve the indoor heat and light environment and save energy.

In order to meet this demand, the accuracy of angle control of the slat angle automatic control blind must be maintained at 1 degree or less. In order to maintain the accuracy of the angle control at 1 degree or less, the accuracy of the angle detecting means also needs to be 1 degree or less, and the slat angle and the actual slat angle are detected by the angle detecting means generated during use. The difference between the two must be corrected.

The present invention has been made in order to meet this demand, and an object thereof is to provide a blind capable of automatically controlling the angle of the slat with an accuracy of 1 degree or less.

[0006]

To achieve the above object, the means adopted by the present invention are: a shaft rotated by an electric motor; a ladder drum attached to the shaft so as to rotate integrally; and a ladder drum. A shaft in a slat angle automatic control blind including a ladder cord or a ladder tape having front and rear upper ends engaged with each other, a slat supported by the ladder cord or the ladder tape, and a control means for controlling and rubbing a motor driver for driving an electric motor. An encoder that can detect the rotation angle from the reference angular position with an accuracy of 1 degree or less is provided, a sensor that detects the reference position of the shaft is provided, and the detection signals of the encoder and the sensor are input to a microcomputer. The computer controls the motor driver.

[0007]

When the reference angular position of the shaft is adjusted to the horizontal position of the slat, the angular position of the shaft, that is, the detection signal θ1 of the encoder corresponds to the slat angle. The microcomputer calculates Δθ of the slat angle θ1 set in advance and the slat angle θ2 detected by the encoder based on the date, and outputs a command to rotate the slat, that is, the shaft by θΔ to the motor driver. Drive the motor according to the command. When the shaft or slat of the sensor comes to the reference angular position, the detection signal is input to the microcomputer, and the microcomputer resets or corrects the detection signal θ2 of the encoder by the signal. In this way, the encoder detects the slat angle with high accuracy of 1 degree or less and further corrects it by the sensor, so that the slat angle can always be adjusted with high accuracy to a predetermined inclination angle.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus of the present invention will be described based on the embodiments shown in the drawings. As shown in FIG. 1, a motor 11 is provided in a blind head box 10, and one end of a shaft 12 is directly connected to an output shaft of the motor or a reducer directly connected to the motor. The ladder drum 13 is fitted on the shaft so as to rotate integrally, and the ladder cord 14 or the upper and lower ends of the ladder tape are locked to the ladder drum. Ladder code 14 and slats 15
Are lined up and suspended.

Although not shown, by the same motor,
In the case of the method of raising and lowering the blind, the winding drum is fitted on the shaft so as to rotate integrally, and the lift cord or the lift tape for hanging the bottom rail is wound around the winding drum. In the case of a method of raising and lowering the blind by another motor or manually, the shaft for rotating the ladder drum and the raising and lowering of the blind are independent.

When the shaft 12 is rotated and the ladder drum 13 is rotated, the front and rear of the ladder cord 14 are displaced and the slats 15 are simultaneously tilted forward and backward to change the slat angle. A sensor 18 for detecting a reference angular position of the shaft 12, for example, a position where the slat 15 becomes horizontal is provided. The sensor 18 is a photo sensor, and detects the reference position of the shaft 12 by the hole of the disk 17 fixed to the shaft 12.

At the other end of the shaft 12, a high resolution, for example 36
A shaft encoder 20 having a 0 ° division quadruple detection circuit is attached to detect the angular position of the shaft 12 corresponding to the slant angle of the slat 15 with high accuracy of 1 ° or less. A signal indicating whether the shaft 12 of the sensor 18 is in the reference position, that is, a signal indicating whether the slat 15 is in the horizontal position, and the shaft 12
The signal of the encoder 20 indicating the rotation angle from the reference position is input to the microcomputer via the input interface and stored in the RAM connected to the CPU. The ROM connected to the CPU stores the solar insolation data signal for one year. The output of the CPU is sent to the motor driver MD via the output interface. The motor driver rotates the motor based on the rotation direction and the rotation speed of the output signal.

[0012] The microcomputer is optimal for blocking the solar radiation by securing the view from the window as much as possible based on the solar radiation data at the date and time stored in the ROM at regular intervals, for example, every 3 minutes. Slat angle θ1
To calculate. The microcomputer calculates the difference Δθ = θ1−θ2 from the detection signal θ2 of the encoder 20. A command signal of the rotation direction and the rotation speed of the motor required to rotate the slat by the angle Δθ is output to the motor driver MD. Upon receiving the signal, the motor driver MD rotates the motor in the commanded direction by the commanded rotation speed. As a result, the slant angle of the slat is adjusted to the optimum slat angle θ1 at that time.

While the slat 15 is rotating, when the slat becomes horizontal, that is, when the shaft 12 is at the reference position, the sensor 18 inputs a horizontal detection signal to the microcomputer. Upon receiving this signal, the microcomputer resets the detection signal θ2 of the encoder 20 stored in the RAM, which indicates the angular position of the shaft 12, to zero. In this way, the detection signal θ2 of the encoder 20 is automatically reset or corrected every time the slat 15 becomes horizontal. Even if the blind is not raised even if there is insolation all day long, the slat angle detection signal θ2 of the encoder 20 changes from −90 degrees to +90 degrees.
Is corrected at least once a day. When the blind is raised or lowered due to cloudy weather or rain, the slat angle detection signal θ2 is corrected each time. In this way, the shaft angle position signal θ2 corresponding to the slat angle is detected with high accuracy of 1 degree or less, and is automatically corrected at least once a day, so the slat of the Venetian blind is always optimal. It can be held at various inclination angles.

[0014]

As described above, the apparatus of the present invention detects the shaft angular position corresponding to the slat angle by the encoder and automatically corrects it at least once a day. Compared to a device that detects the shaft angular position with an accuracy of about 10 degrees by a fixed disk slit and a photointerrupter and adjusts the slat angle with an uncorrected detection value, the adjustment accuracy is greatly improved. Produce an effect.

[Brief description of drawings]

FIG. 1 is a partial sectional front view of an apparatus according to an embodiment of the present invention,

2 is a block diagram of the apparatus of FIG. 1,

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

[Explanation of symbols]

10: Headbox, 11: Motor, 12: Shaft, 13:
Ladder drum, 14: Ladder cord, 15: Slat, 17:
Disc, 18: Sensor, 20: Encoder

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[Procedure amendment]

[Submission date] November 18, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved slat angle automatic control blind for automatically adjusting the tilt angle of the slat of a venetian blind by an electric motor other than the lifting electric motor.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

When the reference angular position of the shaft is adjusted to the horizontal position of the slat, the angular position of the shaft, that is, the detection signal θ1 of the encoder corresponds to the slat angle. The microcomputer calculates Δθ of the slat angle θ1 set in advance and the slat angle θ2 detected by the encoder based on the date, and outputs a command to rotate the slat, that is, the shaft by Δθ to the motor driver. Drive the motor according to the command. When the shaft or slat of the sensor comes to the reference angular position, the detection signal is input to the microcomputer, and the microcomputer resets or corrects the detection signal θ2 of the encoder by the signal. In this way, the encoder detects the slat angle with high accuracy of 1 degree or less and further corrects it by the sensor, so that the slat angle can always be adjusted with high accuracy to a predetermined inclination angle.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

Although not shown, another winding shaft is attached to the winding drum so as to rotate integrally therewith, and a lift cord or a lift tape for hanging the bottom rail is wound around the winding drum. The elevator shaft is rotated by another elevator motor or manually to raise and lower the blind. The rotation of the shaft that rotates the ladder drum 13 and the raising and lowering of the blind are independent.

Claims (2)

[Claims] 1. A shaft (12) rotated by an electric motor (11), a ladder drum (13) provided so as to rotate integrally with the shaft, and a ladder cord (1) in which front and rear upper ends are engaged with the ladder drum. 14) Or ladder tape,
A slat supported on the ladder cord or the ladder tape, and a motor driver (MD) for driving the motor,
In a blind provided with a control means for controlling the motor driver, an encoder (20) for detecting an angular position of the shaft is provided on the shaft, and a sensor (18) for detecting a reference angular position of the shaft is provided. The detection signal of the sensor is input to a microcomputer, the detection signal of the encoder is corrected by the microcomputer, and the motor driver is also controlled by the microcomputer so that the slat has a predetermined inclination angle. Blinds with automatic slat angle control, whose angle position is adjustable. 2. The slat angle automatic control blind according to claim 1, wherein the encoder (20) has a high resolution of 1 degree or less.