JPH01315575A - Motor-driven blind - Google Patents

Abstract

PURPOSE:To control a motor without requiring various expensive sensors or the like by extracting only the fluctuation of the current flowing through the motor raising or lowering a slat curtain and determining the drive and stop of the motor based on the change quantity. CONSTITUTION:The slat curtain 16 of a motor-driven blind 1 is raised or lowered by a motor 4 via a decelerator 3. A motor current detector 5 converts the instantaneous value of the motor current into the DC voltage, its absolute value is inputted to a detector 6 of the change quantity of the motor current. The output signal of the detector 6 is inputted to a comparator 8 via an amplifier 7. The comparator 8 compares the signal inputted from the amplifier 7 and the signal inputted from a setter 9 and judges whether to stop or continue the operation of the motor 4 of the motor-driven blind 1 in operation. When the stop of the motor 4 is determined, a motor operation stop signal is outputted to a control circuit 10.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an electric blind attached to a building,
The details depend on the control device.

<Prior art> Conventionally, the safety stop mechanism of the control device for electric blinds has been disclosed in Japanese Patent Publication No. 1986-44993 or Japanese Publication No. 60-4.
As disclosed in Publication No. 4994, each of the upper and lower limits!・A switch detects the end of the rise and the end of the fall of the slat curtain and stops the electric blind, or as disclosed in Jitsukan No. 61-102793, for example, when the slat curtain reaches the -h ff end. When the negative voltage of the motor becomes large and the absolute current (Iα) flowing through the motor becomes larger than a preset value, a device that detects a state that should be stopped and stops the electric blind, or an ultrasonic or light The electric blinds were stopped by detecting the position of the encoder etc. using various sensors such as those of

<Problems to be Solved by the Invention> - In electric blinds using limit switches and lower limit switches, an increase in the number of parts related to the limit switches and an increase in the cost of wiring work are unavoidable. Also, since there are various differences in the upper and lower limits that should be stopped depending on the installation location or application, the upper limit switch and lower limit switch must be temporarily adjusted before shipping to the second landing site, and the operation switch must be adjusted when installing the electric blind. Not only is it necessary to make main adjustments to the upper limit switch and lower limit switch while operating,
There is a problem that the limit switch needs to be replaced due to aging.

In addition, in electric blinds that are controlled by the absolute value of the current flowing through the motor, the motor is stopped when the current value reaches a preset value. As the load on the motor increases, the motor current also increases, causing the motor to stop unnecessarily.To avoid this, it is necessary to reset the preset current value or increase the load current from the beginning. There is a problem that requires setting.

Furthermore, since a separate limit switch or the like is required to detect the end of the descent of the slat curtain, the same problems as those when using the upper and lower limit switches described above exist. Further, if the bottom rail or the like hits an obstacle while the slat curtain is being lowered, the motor current may not reach the level necessary to stop the motor. This is because, generally, when the slat curtain is lowered, the weight of the slat curtain is used to support the moving motor, which usually places a light load on the motor.

Therefore, even if an obstacle exists, the slat curtain continues to descend and the bottom rail continues to descend, which can be dangerous depending on the type of obstacle. For this reason, there is a separate obstacle detection 1 when descending! It is necessary to provide a side. In addition, the constant current value at which the motor should be stopped is determined by changes in the motor current due to changes in mechanical loss when the slat curtain is raised and lowered, or by an increase in current value due to motor heating due to frequent operation of electric blinds, or during winter. Because there are differences in current values due to differences in the ambient temperature of women's hands,
The setting is difficult.

In addition, electric blinds that use ultrasonic sensors require both a transmitter and a receiver, and those that use optical sensors require accessory parts such as encoders, which increases the number of parts in both cases. However, there are problems such as an increase in the cost of electric blinds and an increase in the total weight.

Means for Solving the Problems> In order to solve the above-mentioned conventional problems, the present invention provides an electric blind in which a slat curtain is lowered by a control drive means that drives or stops a motor based on a drive or stop signal. , a current flowing through the motor is taken out, and only a changer of the flow is taken out, and driving or stopping of the motor is determined based on the change m, and a current detecting means for detecting the current flowing through the motor; The apparatus is equipped with a current change detection means for extracting a current change amount, and a comparison means for outputting a stop signal when the current change amount exceeds a preset tolerance value.

<Function> If a significant fluctuation occurs in the motor while the slat curtain is lowering, the motor current detected by the current detection means will suddenly fluctuate in the direction of increase or decrease. Only the variation is extracted by the current change detection means ζ11, and based on the output signal from the current change detection means, the comparison means compares a value indicating the change in the current flowing through the motor with a preset tolerance value. are compared, and when the value indicating the change in t exceeds the allowable value, a stop signal is output to the control drive means, the motor is stopped, and the raising and lowering of the slat curtain is stopped.

<Embodiment> An embodiment in which the electric blind of the present invention is installed in a building will be described.

In FIG. 1, the sliding member lE3
The film is wound up or unwound by a stripping mechanism 2, and the output shaft of a reducer 3 is connected to the manual shaft of the winding mechanism 2, and the manual shaft of the reducer 3 is connected to a motor. 4 output shafts are connected. The output of a drive circuit 12 controlled by a control circuit IO is connected to the human power of the motor 4 via a motor current detector 5. The motor current detector 5 converts the instantaneous value of the motor current into a DC voltage and outputs it as a signal representing the absolute value of the motor current. The absolute value of the motor current detected by the motor current detector 5 is
The amount of change in the motor current is manually inputted to a detector 6, which detects only the amount of change in the current flowing through the motor 4. The output signal of the motor current change detection circuit 1a6 is amplified by an amplifier 7 and sent to a comparator 8. Comparison 7S8 compares the signal manually input from amplifier 7 and the signal No. 18 manually input from setter 1), and determines the operation of motor 1 of motor 1 during operation. -Stop or continue! When it is determined that the shutter 4 is stopped (1-), a motor operation stop signal is output to the control circuit 'tIIIO.

The control circuit 10 rotates the motor 4 in the forward direction when it receives the electric blind raising signal outputted from the operating device 11, and rotates the motor 4 in the reverse direction when it receives the electric blind lowering signal.
When receiving the electric blind slat adjustment signal, the motor 4 is rotated forward or reverse several times at a certain distance for a short period of time, and when the electric blind stop signal is received, the motor 4 is stopped immediately. The drive circuit vI412 is appropriately controlled based on each signal.

The motor current change amount detector 6 is configured, for example, as shown in FIG. The AC component of the human input signal Vl, which has been subjected to 71i current-to-voltage conversion by the current detector 5, is taken out by a capacitor CI, biased by a resistor R1, and integrated by a resistor R2 and a capacitor C2, with the voltage VC as a reference. It is converted into an AC component signal (2) having an amplitude of . In addition, when the motor current detector performs integration, the signal vl itself is already integrated, so the resistor R2 and capacitor C2 become unnecessary. Note that the amplifier 7 amplifies the signal based on the voltage VC.

The output signal of the setting device 9 indicates normal operating conditions caused by uneven rotation of the motor 4 itself, fluctuations in mechanical loss due to the lifting and lowering of the slat curtain 16, wind hitting the slat curtain, contact with an obstacle that does not cause any hindrance, etc. In consideration of the fluctuations in , the amplitude of the AC component signal 2 is set to be higher than the amplitude of the AC component signal 2 due to these fluctuations. When a sudden and abnormal change occurs in the current flowing through the motor 4, the comparator 8 determines to stop the motor 4, and the control circuit 10 outputs a positive operation stop signal to immediately stop the motor 4. be. The sudden and abnormal fluctuation that occurs in the current flowing through the motor 4 roughly corresponds to the following cases.

First, when the slat curtain 16 finishes rising, all of the slats 13 are rolled up to the top and are in a stacked state, and the bottom rail 15 is still trying to rise and begins to compress the stack of slats 13. At this time, the load on the motor 4 increases rapidly and the motor current increases rapidly. Second, if the lifting tape 14 that suspends the bottom rail 15 is fully extended at the end of the descent of the slat curtain 16, the pulleys for winding up and rewinding the lifting tape 14 will idle. The negative and negative voltage of the motor fluctuates and the motor current suddenly changes.

Thirdly, when the slat curtain 16 finishes lowering, the bottom rail! 5 comes into contact with the floor or window frame, or the slat curtain 16
If a moving member such as the bottom rail 15 hits an obstacle during its descent, the load on the motor 4 will fluctuate and the motor current will suddenly change. Fourth, if an obstacle is caught on a moving member such as the slat 13 or the bottom rail 15 while the slat curtain 16 is rising, the load on the motor 4 increases rapidly and the motor current increases rapidly. The fluctuation of the motor current in each of the above cases is much larger than the fluctuation range of the motor current under normal operating conditions.
The comparator 8 immediately outputs a motor operation stop signal.

Human power for the operation Wll can be applied not only by using toggle switches or push button switches, but also by using the infrared remote control system that is popular in ordinary homes.Also, by using a voice recognition device, human power by human voice can be used. Available for use.

FIG. 3 shows another embodiment of the present invention, in which the functions of the motor current change detector 6, amplifier 7, comparator 8, setting device 9, and control circuit IO in FIG. 1 are converted into an analog-to-digital converter. The other parts have the same or equivalent functions as those in Fig. 1, so the same reference numerals as in Fig. 1 are given. Omit duplicate explanations.

In FIG. 3, input No. 13 v1, which has been subjected to current-to-voltage conversion by the motor current detector 5, is converted from analog to digital by the microcomputer 17 to become a digital quantity Dl, which is stored in the RAMI within the microcomputer 17. Next, within the executable minute range of the microcomputer 17, the human input signal Vl is converted from analog to digital and stored in the RAM 2 as a digital signal mD2. By calculating the change in the human power No. 18 Vl within a minute time, ID3, by assuming that 1 - D21 = D3, the alternating current component is extracted from the human power signal Vt as a digital signal, and this change ff1D3 is stored internally in advance. It is compared with the set value to determine whether to stop or continue the operation of the motor 4 of the electric blind l in operation, and when it is decided to stop the motor 4, the drive circuit 1
2 to quickly stop the motor 4. Further, the microcomputer 17 receives signals for raising, lowering, adjusting the slats, and stopping the electric blind outputted from the operating device 11, and after determining whether or not to accept these signals, controls Ql of the drive circuit 12 in accordance with these signals. This is what we do.

<Effects of the Invention> The present invention brings the electric blind to a safe stop based on a changer of the current flowing through the motor. This eliminates the need for various expensive sensors, reduces the number of parts, reduces assembly man-hours, and reduces costs for electric blinds.On the other hand, when installing electric blinds, adjustments to various switches or sensors are required. It has the advantage that it does not require construction experts because it is unnecessary.

Also, regardless of the absolute flow rate of the current flowing through the motor, the safety stop function works by detecting only changes in the load condition that directly acts on the slat curtain during lifting and lowering, so it may be due to changes over time. Fi? There is no inconvenience such as readjustment of A setting values or estimated settings. Furthermore, when the slat curtain hits an obstacle while rising, or when all the slats are rolled up to the top and the first rise is completed, the conventional electric blind is controlled by the current flowing to the motor. It is possible to stop the motor before it reaches the mechanical lock state of the winding mechanism that often occurs in other systems, and the resulting abnormal overload state of the motor, which alleviates fatigue deterioration and improves quality and service life. On the other hand, since the winding mechanism and other components do not require much mechanical strength, they can be constructed from lightweight and inexpensive materials. Further, even if the slat curtain hits an obstacle while descending, the descending is immediately stopped, so danger from the obstacle can be avoided without providing a separate obstacle detection mechanism.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a block explanatory diagram explaining the configuration and function, FIG. 2 is a circuit diagram showing an example of the detection means of the motor current changer shown in FIG. 1, and FIG. is a block explanatory diagram illustrating another configuration and function. l...Electric blind, 4...Motor, 16...
Slat curtain, 18... Current detection means, 19...
- Current change amount detection stage, 20... comparison means, 21.
...Control drive means.

Claims (1)

[Claims] An electric blind that raises and lowers a slat curtain by means of a control drive means that drives or stops a motor based on a drive or stop signal, comprising: a current detection means for detecting the current flowing through the motor; An electric blind comprising: a detection means; and a comparison means that outputs a stop signal when the amount of current change exceeds a preset tolerance value.