JPH1136758A - Electric blind - Google Patents

Abstract

PROBLEM TO BE SOLVED: To invalidate the detecting output of a sensor to an obstruction when reaching to the place of a lower limit of an electric blind is detected accurately. SOLUTION: When a lower-limit place limit switch 12 is turned on normally within a lower setting time when the electric blind is lowered, normality is decided regardless of the on-off of an obstruction limit switch 13 and abnormal display is not conducted, and a driving motor 4 for lifting and lowering is stopped. When the obstruction limit switch 13 is turned on when the lower-limit place limit switch 12 is turned off, when the height place of a bottom rail 3 from a lowermost end place to height on the outside of specified tolerance is detected, the presence of an obstruction is decided and abnormal display is conducted, and the driving motor 4 for lifting and lowering is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blind capable of performing an ascending / descending operation using an electric motor and automatically controlling the ascent / descent, or capable of centrally controlling one or a plurality of blinds.

[0002]

2. Description of the Related Art Conventionally, electric blinds which open and close by raising and lowering blinds using an electric motor (hereinafter simply referred to as a motor) have been used. In general, an electric blind includes a lifting drive mechanism for raising and lowering the slat, a tilter mechanism for rotating the slat to adjust the slat angle, and a motor for driving these. As the electric blind, there is a type that centrally controls a plurality of electric blinds, or a type that automatically controls the electric blinds.In the elevation control of these electric blinds,
The vertical movement is stopped by detecting that the blind is at the upper limit position or the lower limit position.

As means for detecting that the blind is at the upper limit position or the lower limit position, a limiter switch is provided at the upper end position and the lower end position to detect the upper limit position or the lower limit position of the blind, a pulse motor, an encoder, or the like. Is used to detect the upper limit position or the lower limit position by counting the number of pulses, or to detect the upper limit position or the lower limit position by counting the number of rotations of the motor. In addition, it has an obstacle sensor, and if there is an obstacle between the upper limit position and the lower limit position of the blind, when the bottom rail hits the obstacle, it detects it and stops the descending operation and stops the operation It has become.

[0004]

However, in the above-mentioned conventional electric blind, the vehicle normally stops at the lower limit position when the blind descends due to the presence of a small obstacle or the like within the detection error range of the lower limit position. Regardless, the obstacle sensor sometimes emits an ON signal, and at this time, there is a problem that abnormal information indicating that there is an obstacle is issued.

It is an object of the present invention to provide an electric blind in which the detection output of an obstacle sensor is invalidated when it is normally detected that the electric blind has reached a lower limit position.

[0006]

To achieve the above object, an electric blind according to the present invention comprises a tilter drum for rotating at least a slat, a driving device for driving the tilter drum, and a control means for controlling a driving motor in the driving device. An electric blind having a lower limit switch and an obstacle limit switch. When the lower limit switch is normally ON, the electric blind normally operates regardless of ON-OFF of the obstacle limit switch. When the lower limit switch is OFF and the obstacle limit switch 13 is ON when the lower limit switch is OFF, it is determined that there is an obstacle and an error is displayed. There is no danger of confusing the administrator or the user without giving a display. When the lower limit switch is normally ON, the height range in which the display is determined to be normal and no abnormal display is performed is stored as a set value regardless of ON / OFF of the obstacle limit switch. Thereby, it can be easily changed according to the device or the use condition, and the device can be adapted as needed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to the drawings.
3 and 4, a schematic configuration of an electric blind to which the present invention is applied will be described. A number of slats 1 are connected between a head box 2 and a bottom rail 3 by a lifting tape 9 and a ladder cord 10. . A drive motor 4 for raising and lowering, a gear box 5, a pulley 6, a drive motor 7 for adjusting tilt, and a tilter drum 8 are provided in the head box 2 in a connected manner, and the drive motor 4 for raising and lowering and the drive for tilt adjustment are provided. A controller 11 is connected to the motor 7, and a blind position detection sensor, an obstacle sensor for detecting the presence or absence of an obstacle, and a slat angle sensor are connected to the controller 11.

The elevating tape 9 is wound or unwound by the rotation of the pulley 6 to elevate and lower the slats 1 and the bottom rail 3.
One end of the ladder cord 10 is pulled out and the other is sent out by turning the tilter drum 8 in the forward / reverse direction by forming two cords penetrating both ends of the slat 1 and connecting the ends to the tilter drum 8. Adjust the angle of the slat 1.

The controller 11 determines the upper and lower positions of the blind and the intermediate position between the upper and lower positions.
An electronic type or an elevating tape that counts and determines the number of driving pulses to the elevating drive motor 4, or determines by detecting a change in the drive pulse width, or counts the number of rotations of the elevating drive motor 4. 9 is provided with a mechanical or other height position determination function for detecting looseness. In FIG.
A lower limit position limit switch 12 that is turned on when it is determined that the blind has reached the lower limit position, and an obstacle limit switch 13 that detects the presence or absence of an obstacle based on the deflection of the elevating tape 9 and that is turned on when an obstacle is present, includes a controller. 11 are independently connected to each other, and
Alternatively, when at least one of the obstacle limit switches 13 is turned on, the lifting drive motor 4 is stopped.

The control operation of the present invention will be described with reference to the flowchart of FIG. When the electric blind is lowered, when the lower limit position limit switch 12 is normally ON within the set descent time, that is, the height position of the bottom rail 3 is within a predetermined allowable range from the lowermost position. Is detected, the obstacle limit switch 13
Regardless of N-OFF, it is determined that the motor is normal, and no abnormal display is performed, and the lifting / lowering drive motor 4 is stopped. Here, the predetermined allowable range is a predetermined height range above the lowermost position of the bottom rail 3, and
Is a range that can be recognized as being at the lowermost position, in other words, it can be expressed as an allowable error at the lower end. The descent setting time is the time required to descend from the uppermost position of the bottom rail 3 which is the fully opened position of the blind to the lowermost position of the bottom rail 3 which is the fully closed position of the blind, and is equal to or slightly less than the maximum required time. Is a large value.

When the lower limit position limit switch 12 is OFF, that is, when it is detected that the height position of the bottom rail 3 is at a height outside the predetermined allowable range from the lowermost position, the obstacle limit is set. When the switch 13 is turned on, it is determined that there is an obstacle, an abnormality is displayed, and the lifting drive motor 4 is stopped. When the lower limit switch 12 is normally turned on, the height range in which it is determined to be normal and no abnormal display is performed is stored as a set value regardless of whether the obstacle limit switch 13 is on or off. Let it.

According to this configuration, when the lower limit switch 12 is normally turned on within the set descent time,
Regardless of whether the obstacle limit switch 13 is ON or OFF, it is determined that it is normal and no abnormal display is performed, the drive motor 4 for lifting and lowering is stopped, and the lower limit position switch 1
2 is OFF, that is, when it is detected that the height position of the bottom rail 3 is at a height outside the predetermined allowable range from the lowermost position, the obstacle limit switch 13 is turned off.
If N, it is determined that there is an obstacle and an abnormal display is performed.
Since the lifting / lowering drive motor 4 is stopped, there is no possibility of erroneous display of an abnormality and confusion of a manager or a user. When the lower limit switch is normally ON, the height range in which the display is determined to be normal and no abnormal display is performed is stored as a set value regardless of ON / OFF of the obstacle limit switch. Thereby, it can be easily changed according to the device or the use condition, and the device can be adapted as needed.

[0013]

Since the present invention is configured as described above, it has the following effects. When the lower limit position limit switch is normally ON, regardless of the ON / OFF state of the obstacle limit switch 13, it is determined to be normal and no abnormal display is performed. When the limit switch is turned off, if the obstacle limit switch is turned on, it is determined that there is an obstacle and an abnormal display is performed, and the drive motor for lifting and lowering is stopped. And there is no danger of confusing users. When the lower limit switch is normally ON, the height range in which the display is determined to be normal and no abnormal display is performed is stored as a set value regardless of ON / OFF of the obstacle limit switch. Thereby, it can be easily changed according to the device or the use condition, and the device can be adapted as needed.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a control operation of the present invention.

FIG. 2 is an explanatory diagram of connection of a limit switch used in the present invention.

FIG. 3 is a schematic front view of an electric blind to which the present invention is applied.

FIG. 4 is a schematic side view of an electric blind to which the present invention is applied.

[Explanation of symbols]

Reference Signs List 1 slat, 2 head box, 3 bottom rail 4 drive motor for lifting and lowering, 5 gear box, 6 pulley 7 drive motor for tilt adjustment, 8 tilter drum, 9
Elevating tape 10 Ladder code, 11 Controller, 12 Lower limit position limit switch 13 Obstacle limit switch

Claims (2)

[Claims] 1. An electric blind comprising at least a tilter drum for rotating a slat, a drive device for driving the tilter drum, and control means for controlling a drive motor in the drive device, a lower limit position limit switch;
When the lower limit switch is normally ON, it is determined to be normal regardless of ON-OFF of the obstacle limit switch, and no abnormal display is performed. Limit switch is OF
An electric blind characterized in that when the obstacle limit switch 13 is turned on when the vehicle is in the F position, it is determined that an obstacle is present and an abnormality is displayed. 2. The lower limit switch is normally ON.
ON / OFF of the obstacle limit switch
2. The electric blind according to claim 1, wherein a height range in which the display is determined to be normal and an abnormal display is not performed is stored as a set value, regardless of the height.