JPH06100047B2 - Electric blind descent height setting device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a descent height setting device for an electric blind,
In particular, the present invention relates to an electric blind descent height setting device capable of easily designating and canceling the descent position of the blind.

[Prior Art] A conventionally proposed device for setting a descent height of an electric blind is composed of a reduction mechanism that applies rotation of a lifting shaft and a cam. That is, the rotation speed of the lifting shaft is reduced to open and close contacts such as a micro switch linked with a cam to stop the electric motor. When changing the descent height, adjust the screwed bolt of the cam that turns on and off the micro switch in the speed reduction mechanism, which causes the motor to stop early or late, resulting in The descent height was adjusted by controlling the energization time. In other words, the energization time of the electric motor is changed by changing the position of the cam.

[Problems to be Solved by the Invention] However, in such a conventional method of setting the descent height by the electric blind, the electric blind is always used when setting the descent height by adjusting the position of the cam. It was necessary to install it on the window frame to lower the blind, attach it to the blind according to the height of the window frame, and adjust the cut-and-try method while operating the electric blind on site. For this reason, there is a drawback that it takes a lot of time and labor to adjust the attachment to the window frame. In addition, the friction state and position of the cam change due to long-term use and changes over time, and the descending height changes, and it is necessary to manually adjust the descending height each time, and the cam, gear, or screw bolt However, the main purpose of the present invention is to make adjustment unnecessary and to lower the blind to the set position. It is an object of the present invention to provide a descent height setting device for an electric blind.

[Means for Solving the Problems] The above object of the present invention is to provide the descending position height setting means of the electric blind to the command means such as a wireless remote control transmitter provided separately from the blind body. This can be achieved by setting the descending position height from command means such as a remote control transmitter.

That is, the lowering height setting device for an electric blind according to the present invention rotates according to the rotation of a plurality of blades connected by a string-shaped member, an electric motor, and the electric motor to wind or rewind the string-shaped member to raise or lower the blind. A head box accommodating a drum for causing the blind and a blind main body to be provided separately, and a command means for commanding the raising or lowering of the blind by a wireless method, and a command signal from the command means are received, and the signal is received. To the headbox, the command means, and the lower limit position setting means for setting the lower limit position for setting the lower limit position of the descent of the blind to an arbitrary position, and the rotation of the drum according to the rotation of the drum. The pulse signal generating means for generating the pulse signal and the pulse signal generated by the pulse signal generating means in response to the ascending or descending command from the command means Storage means for rewritably storing the pulse count value of the arbitrary position set by the lower limit position setting means and the generated pulse signal, and the counted value is the value set by the lower limit position setting means. According to the determination means for determining whether or not
Control means for rotating the electric motor to rewind the string-like member by the drum to lower the blind, and stopping the electric motor when it is determined that the count value matches the value set by the lower limit position setting means. Composed of and.

[Operation] The descent height setting device for an electric blind according to the present invention is
The setting of the descent height is performed by the wireless command means provided separately from the blind body, and the command signal from the command means is transmitted to the blind via the receiving means, and when the blind is lowered, the drum The pulse signal generated according to the rotation is counted, and if the count value corresponding to the descent height of the blind matches the preset lower limit position, the descent of the blind is stopped. It is possible to eliminate the need for work, and the descent position of the blind can be set from the wireless remote control command means in correspondence with any window frame.

[Embodiment of the Invention] As means for solving the conventional problems, for example, a head box for accommodating a blind lifting device, a command means for commanding an up or down movement of the blind, and a head box An electric blind that is provided below and includes a plurality of blades that are connected by a string-shaped member. The blind is provided inside the head box and rotates according to the rotation of the electric motor to wind or unwind the string-shaped member. A drum for raising and lowering, a pulse signal generating means for generating a pulse signal according to the rotation of the drum, and a lower limit position setting means using a dip switch capable of setting a lower limit position of the blind to an arbitrary value, Discrimination for counting generated pulse signals and discriminating whether or not the counted value coincides with the value set by the lower limit position setting means. Means, and the electric motor is rotated in response to the descending command to rewind the string-like member by the drum to descend the blind, and it is determined that the count value matches the value set by the lower limit position setting means. Accordingly, it may be configured by a control unit that stops the electric motor.

However, in the above-described lower limit position setting means for the electric blind, the lower limit setting switch is provided in the control unit built in the head box, and the lower limit of the lowering of the blind is set by the combination of these switches. For this setting, the switch combination is appropriately selected at the factory according to the height of the window to be installed, and it is adjusted to the height to the window. However, if the window height is set incorrectly or the blind lower limit setting switch is set incorrectly, the blind will not be able to reach the bottom of the window frame after it is attached to the window, and a gap will be created at the bottom of the window frame. However, problems such as loosening of the entire blind occur.
In order to correct this, it is necessary to change the setting of the lower limit setting switch and set it again at the installation site so that it is located at the height of the installed window.

However, the lower limit setting switch is provided in the control unit in the head box. Therefore, the workability of re-setting the lower limit setting switch is extremely poor because the headbox is located above the window, etc., and the work efficiency is significantly reduced at the site where many blinds are installed such as offices and conference rooms. . In addition, after installing blinds, if you follow other objects such as potted plants in the lower part of the window frame, in order to prevent the lower part of the blinds from hitting these when lowering the blinds, the descending state of the blinds every time you lower it. It is necessary to stop the descent of the blind while watching, or reset the lower limit setting switch as described above. However, it is generally necessary to ask the construction company that installed the blinds to reset this setting.

Summarizing the above problems, the above-mentioned electric blind lowering position setting device has the following problems.

(I) After installing the blind on the window or the like, it is not possible to easily change the lower limit setting switch provided in the control unit in the head box because the work efficiency in construction is extremely poor.

(Ii) It is necessary to increase the number of combinations of the lower limit switches in order to make the range of the lower limit setting more detailed, which increases the number of the lower limit switches, resulting in an increase in cost. Moreover, the setting operation becomes complicated.

Therefore, in the present invention, the above-mentioned problems are solved by setting the height of the lowered position of the electric blind as follows.

First, with reference to FIGS. 1, 2, and 3, an external configuration of an embodiment of the present invention will be described. FIG. 1 is a diagram showing a main part of a winding mechanism for an electric blind according to the present invention, and FIG. 2 is a diagram showing an electric configuration for explaining a lower limit position setting method for an electric blind according to the present invention. FIG. 3 is a perspective view for explaining the details of the blind winding mechanism. The electric blind according to the present invention includes a slat 13, a head box 15 accommodating a device for driving the slat 13 up and down, a controller 2 for controlling the up and down of the slat 13, and an up and down command for the slat. The infrared remote control transmitter 60 is included. The head box 15 is a lifting unit 6, 7, 8 for raising and lowering the slat 13 by hoisting and lowering the lifting tape 10, a geared motor 4 for rotating the lifting unit, and a control unit for controlling the rotation of the motor. 3 and an elevating shaft 12 for transmitting the rotational force from the motor to each elevating unit.

The controller 2 includes a raising switch 21 for raising the slats 13, a stop switch 22 for stopping the movement of the slats, and a lowering switch 2 for lowering the slats 13.
3, Includes an open switch 24 for opening the slat, a close switch 25 for closing the slat, and a receiver 69 for receiving an infrared signal from the infrared remote control transmitter. The receiving unit 69 does not have to be built in the controller 2, and may be externally provided and have a different configuration from the controller 2. The receiving unit 69 is connected to the control unit 3 by a wiring system different from the switches 21 to 25. The power cord 1 and the controller 2 are connected to the control unit 3. The control unit 3 includes a microcomputer (hereinafter abbreviated as MPU) 34, a power supply unit, and the like.

Since there are various known configurations of the receiving unit 69, the details thereof will be omitted. As a function, it receives an infrared signal transmitted from the remote control transmitter 60 (generally, a frequency of 38 kHz or the like is used as a carrier and pulse-modulated by the remote control signal), and demodulates the modulated infrared signal, Returning to the remote control signal. This remote control signal is input to the MPU 34. The MPU 34 takes in the remote control signal, decodes the command signal from the remote control transmitter 60, and controls the blind in accordance with the command.

The remote control transmitter 60 has an up switch 64 and a stop switch 6
5, lowering switch 66, and slat opening switch 67,
Includes five operating switches for the closing switch 68.

A geared motor 4 including an electric motor and a reduction gear is connected to the control unit 3. The rotation shaft of the geared motor 4 is connected to the lifting shaft 12 via the coupling 5. Lifting units 6, 7 and 8 are connected to the lifting shaft 12. The sensors, fault switches (not shown), and upper limit switch 16 built in these lifting units 6, 7 and 8 are connected to the control unit 3 by the wiring material 9. In addition, the wiring material 9 is a geared motor 4
Also included is a wiring 20 and a connecting cord 20 to the controller 2. The lifting units 6 and 8 include a winding drum 37 and a ladder drum 39, and the lifting unit 7 includes only the ladder drum 39.

One end of the lifting tape 10 (which may be a string-like one) is fixed to the winding drum 37.
The other end of the lifting tape 10 has holes 13 for a plurality of slats 13.
It penetrates through a and is fixed to the bottom rail 14. The take-up drum 37 winds or rewinds the lifting tape 10 in accordance with the rotation of the elevating shaft 12, and slats the slats.
Raise and lower 13 and bottom rail 14. One end of the ladder cord 11 is fixed to the ladder drum 39, and the other end of the ladder cord 11 is fixed to the bottom rail 14.

This ladder cord 11 is, for example, 50 mm, 25 mm of slats 13.
Or two 11a, 11b1 with a space corresponding to the width of 15mm
It is composed as a set, these two ladder cords 11
The a and 11b are connected at intervals corresponding to the pitch p of the slats 13, for example, in the form of a ladder with horizontal cords 11c. The slats 13 are inserted and held in a ladder-shaped space composed of ladder cords 11a and 11b and lateral cords 11c. Then, the ladder drum 39 rotates with the rotation of the elevating shaft 12, and controls the opening degree of the slats. The bottom rail 14 functions as a weight for lowering the blind and as a weight for preventing the blind from swaying due to wind or the like after the lowering.

The control unit 3, the geared motor 4, and the lifting units 6, 7, and 8 are covered by a head box 15 that constitutes an outer box. An upper limit switch 16 is provided below the head box 15, and the upper limit switch 16 is pressed by the slats 13 to operate when the blind is wound, and detects the upper limit position. The upper limit switch 16 may be composed of an electronic switch such as an optical sensor.

Next, with reference to FIG. 2, an electrical configuration of an embodiment of the present invention will be described. AC power is input to the power transformer 31 via the power cord 1. The power transformer 31 stabilizes the low voltage by stepping down the input AC power supply.
32 to supply the power required for the control unit 3 and the geared moder 4. A motor drive circuit 33 is connected to the MPU 34, and controls the geared motor 4 in a normal rotation, a reverse rotation, or a brake mode according to a command from the MPU 34.

Here, the brake mode is to short-circuit the input terminal of the geared motor 4 via the motor drive circuit 33,
By thus short-circuiting the input terminals of the geared motor 4, the geared motor 4 can be braked. That is, for example, when mechanical force is applied to the geared motor 4 such as inertia caused by the descent of the blind or when the blind is strongly pulled in the direction in which it is artificially lowered, the geared motor 4 operates on the principle of the DC generator. Will generate a back electromotive force. Therefore, by short-circuiting between the input terminals, a current for causing this rotation to be blocked, that is, a reverse rotation, flows, and the geared motor 4 is stopped. A voltage detection circuit 35 is connected to the MPU 34. The voltage detection circuit 35 detects the voltage of the power supply Vcc supplied to the control unit 3. That is, the voltage detection circuit 35 monitors the voltage supplied from the power cord 1 on the low voltage side via the transformer 31.

The MPU 34 includes a RAM 70 for setting the descent position of the electric blind, which will be described later. The RAM 70 is a part for storing the descent position height of the blind inputted from the remote control transmitter 60. The obstacle switch 36 is built in the elevating units 6 and 8, and the blind is descending as an example of trouble. When the descending motion is stopped by hitting an obstacle or the like on the way, if the geared motor 4 continues to rotate in the descending direction, the lifting tape 10 loosens, and if this continues, the winding drum 37 causes the lifting tape 10 to move.
However, if the blind is raised next time, the lifting tape 10 cannot be wound up, resulting in a serious failure.

In order to prevent this, loosening of the lifting tape 10 is detected as a conventional technique by a mechanical switch or an optical or magnetic sensor, and the detection output is input to the MPU 34, and a geared motor is supplied via the motor drive circuit 33. I am trying to stop 4. This sets the motor drive circuit 33 to the brake mode. Further, the MPU 34 reverses the geared motor 4 for an arbitrary time and winds up the blind to loosen the lifting tape 10, and then stops the geared motor 4.

The take-up drum 37 takes up or rewinds the lifting tape 10 in accordance with the rotation of the geared motor 4, and raises or lowers the blind.
Includes Guides 371 and 372. A slit 373 is formed around the guide 371, for example. A disc may be attached to the other part of the elevating shaft 12 separately from the winding drum 37 to form a slit in the disc, so that the elevating shaft 12 rotates or the motor shaft of the geared motor 4 rotates. Since the same effect can be obtained by detecting, the mounting position and method are not limited.

A photo interrupter 38 is provided in association with the guide 371 of the winding drum 37. The photo interrupter 38 optically detects the connection / disconnection of the slit 373 formed in the guide 372 of the winding drum 37, converts the rotation of the elevating shaft 12 into an electric signal, and inputs the electric signal into the MPU 34. That is, the MPU 34 can know the amount of lifting or lowering of the lifting tape 10 by the rotation of the winding drum 37 by an electric signal. As described above, one end of the ladder cord 11 is fixed to the ladder drum 39, and the rotation of the ladder drum 39 changes the angle of the slats 13 to change the input amount of outside light to achieve an appropriate brightness in the room. Or turn off external light.

The ladder drum 39 is fitted in a frictional state via a drum shaft 40 that penetrates the lifting shaft 12. The elevating shaft 12 and the drum shaft 40 rotate integrally (synchronously), but when the ladder drum 39 rotates almost half a turn, the rotation of the ladder drum 39 is stopped by a protrusion (not shown) provided by the head box 15 or the like. Then, it slips on the drum shaft 40 and runs idle. Further, when the elevating shaft 12 is reversed, the ladder drum 39 is also reversed in the same manner, but similarly to the above description, it hits a protrusion such as the head box 15 and spins idle. The slat 13 is rotated by the half rotation of the ladder drum 39, and the angle of the slat 13 is changed. That is, the slat 13 changes from a state in which it is slanted and closed on the indoor side to a horizontal state and is opened, and then a state in which it is slanted and closed to the outdoor side. When the elevating shaft 12 rotates in the direction opposite to that described above, the rotation of the slats 13 is reversed. That is, the state in which the outdoor side is tilted and closed is changed to the horizontal state and the state is opened, and the indoor side is tilted and closed.

A slit 391 for detecting the rotation of the ladder drum 39 is formed at one end of the ladder drum 39. The slit 391 is formed at an angle corresponding to almost half rotation of the ladder drum 39, and a photo interrupter 41 is provided to detect the position of the slit 391. The photo interrupter 41 detects the position of the slit 391, converts it into an electric signal, and gives it to the MPU 34. The MPU 34 responds to this electric signal by changing the angle of the ladder drum 39, that is, the slat.
You can know 13 angles. Lower limit position setting switch 42
Is for setting the lower limit position when the blind is lowered, and is composed of four switches in this embodiment.

The switches 21 to 25, the clock generation circuit 43 and the reset circuit 44 of the controller 2 are connected to the MPU 34.

FIG. 4 is a schematic block diagram showing an embodiment of the remote control transmitter 60. The operation of the remote controller will be described with reference to FIGS. 2 and 4. The remote control transmitter 60 includes a microcomputer 61 that creates a remote control signal according to the inputs of the up switch 64, the stop switch 65, the down switch 66 and the slat open switch 67, and the close switch 68, and the signal created by the microcomputer 61 is an infrared signal. And an infrared light emitting unit 63, which is a means for sending out as. Note that the carrier modulated by the remote control signal, such as 38 kHz, is used by the microcomputer 6
There is a case where it is made by 1 and a case where the infrared light emitting portion 63 has an oscillator, but either one may be used. The power source 62 generally uses a dry battery.

Next, the operation of the remote control transmitter will be described. When the rising switch 64 of the remote control transmitter 60 is input, the microcomputer 61 receives the input and sends a rising signal to the infrared emitting section 63.
The infrared light emitting unit 63 sends an infrared signal. This infrared signal is received by the receiver 69 provided in the controller 2,
The demodulated remote control signal is input to the MPU 34. The MPU 34 decodes the signal, determines that it is an ascending signal, and raises the slat 13 by the following series of operations.

Similarly, when the descent switch 66 of the remote control transmitter 60, the slat open switch 67, and the close switch 68 are input, the microcomputer 61 outputs a remote control signal according to each of them to the infrared emitting section 63.
To the receiving unit 69 via. These signals are demodulated and then input to the MPU34, which decodes these signals.
The blinds are controlled according to their respective commands. To stop the operation of the blinds, enter the stop switch 65 of the remote control transmitter 60 and follow the same route as above
U34 decodes the stop signal and stops the operation of the blind.

The opening and closing of the slats are as follows. This, for example, inputs the slat open switch 67 to adjust the slat angle. When the desired slat angle is reached, the open switch 67 is released and the stop switch 65 is input.
As a result, the slat angle stops at the desired angle. However, after visually confirming that the desired slat angle has been reached, release the slat open switch 67 to release the stop switch.
If you enter 65 to stop the slat motion, the following problems occur. In other words, from visual confirmation to the stop switch
It takes an artificial time until the operation of 65, and the microcomputer 61 sends a stop signal, and the MPU 34 decodes the stop signal via the infrared transmitter 63 and the infrared receiver 69 to stop the operation of the slat. There is a delay in the processing time of the microcomputer. As a result, it becomes difficult to match the desired slat angle. The slat operating time is fast and the slat does not stop at the desired slat angle. To prevent this, the slat open switch 67,
If the inputs to the closing switch 68 are released, the microcomputer may determine that these inputs are gone. Microcomputer 61 is programmed to issue a stop signal as described above. In this way, if the slat opening switch 67 or the closing switch 68 is released when the slat angle reaches the desired position, the microcomputer 61 immediately sends a stop signal. The stop signal is input to the microcomputer 61 via the infrared light emitting unit 63 and the receiving unit 69, is decoded, and the operation of the slat is stopped. For raising and lowering, the blind is stopped by inputting the stop switch 65.

Next, a specific operation of the electric blind according to the present invention will be described with reference to FIGS. When the power cord 1 is energized, the AC power source is converted into a low voltage by the power transformer 31 and supplied to the stabilized power source 32.
The stabilizing power supply generates a stabilizing power supply Vcc required for the control unit and a power supply V _M for driving the geared motor 4. First, when raising the blind, the raising switch 64 provided on the remote control transmitter 60 is operated. The MPU 34 receives the signal from the raising switch 64 and provides an intermittent signal to the motor drive circuit 33 to close the slat 13.

In response, the motor drive circuit 33 intermittently rotates the geared motor 4. When the geared motor 4 is rotated intermittently, this rotational force is transmitted via the coupling 5 to the lifting shaft.
Rotate 12 intermittently. With the rotation of the lifting shaft 12, the winding drum 37 and the ladder drum 39 are rotated via the drum shaft 40. Due to the intermittent rotation, the rudder drum 39 eventually rotates slowly and the rudder cord 11
On the other hand, if, for example, the side of the ladder cord 11b is wound up, the pair of ladder cords 11a is lowered. That is, as the ladder drum 39 rotates in the direction of the arrow in FIG. 3, the ladder cord 11b side goes up and the 11a side goes down. As a result, the slat 13 rotates in the direction of the arrow and is in the closed state.

The ladder drum 39 rotates, the slit 391 provided in the ladder drum 39 interrupts the output signal of the photo interrupter 41, and a pulse signal is given to the MPU 34. MPU34
When the ladder drum 39 is further rotated, that is, the slats 13 are gradually closed, the pulse signals are sequentially counted. When the ladder drum 39 rotates to the state where the slat 13 is completely closed, the protrusion (not shown) provided on the ladder drum 39 hits the protrusion (not shown), and the ladder drum 39 idles. Therefore, the pulse signal from the photo interrupter 41 is not given to the MPU 34. Depending on the MPU
34 determines that slat 13 is closed. Also MP
The U34 counts the number of pulses of the pulse signal output from the photo interrupter 41 after the raising switch 64 of the remote control transmitter 60 is operated, and stores the counted value in the slat 13 as a movement angle in a memory (not shown).

Next, when the pulse signal from the photo interrupter 41 is no longer given to the MPU 34, a continuous winding signal is given to the motor drive circuit 33. In response, the motor drive circuit 33 changes the geared motor 4 from intermittent rotation to continuous rotation, and shifts to the blind winding operation.

That is, as the geared motor 4 continuously rotates, the winding drum 37 continuously rotates, and the lifting tape 10 is rotated.
To wind up. The other end of the lifting tape 10 is a bottom rail
Since it is fixed to 14, the slat 13 gradually rises from the bottom. To stop the rising of the blind, the stop switch 65 provided in the remote control transmitter 60 is operated. The MPU 34 gives a stop signal to the motor drive circuit 33 in response to a command from the stop switch 65. In response, the motor drive circuit 33 stops the geared motor 4. At this time, the motor drive circuit 33 short-circuits the input terminal of the geared motor 4 and brakes the geared motor 4 to stop it.
Since this is a well-known technique, its detailed description is omitted.

Next, as described above, the slat 1 stored in the MPU34
In order to return to the angular position of 3, the MPU 34 gives a reverse rotation intermittent signal to the motor drive circuit 33 to reverse the ladder drum 39 in the direction opposite to the arrow shown in FIG. As a result, the ladder cord 11 performs the opposite operation to that described above, and the slat 13 rotates in the direction opposite to the arrow and is opened.
At the same time, the MPU 34 counts the pulse signal from the photo interrupter 41, and if it matches the count value input when rising,
U34 gives a signal for stopping the geared moat 4 to the motor drive circuit 33 to stop the geared motor 4. As a result, the blind is automatically adjusted to the angle of the slat 13 before stopping and ascending.

The operation when lowering the blind is performed by the remote control transmitter.
This is done by operating the lowering switch 66 provided on the 60. The descent of the blind is performed by performing an operation substantially opposite to the above-described ascent. When the stop switch 65 of the remote control transmitter 60 is operated, the geared motor 4 is stopped at that point and the blind is stopped. Also,
The angle of the slats 13 is automatically adjusted to the angle before descending in the same manner as described above.

It should be noted that the above-mentioned operation is performed from the switch provided in the remote control transmitter 60, but since the controller 2 has the same switch, it can also be performed from the controller 2.

Next, a method of setting the descent height of the blind will be described. The setting of the descent height of the blind according to the present invention is performed by using various switches provided in an infrared remote control transmitter which is separated from the blind main body. Not only this descent position setting method, but also the setting by the dip switch described in the prior art may be used together.

5 and 6 are flowcharts showing the procedure for setting the lower limit position of the electric blind according to the present invention.

FIG. 5 is a flowchart showing the operation of the MPU 34, and FIG. 6 is a flowchart showing the operation of the mokon transmitter 60.

The lower limit position setting procedure of the electric blind according to the present invention will be described with reference to FIGS. 5 and 6.

First, the raising switch 64 or the lowering switch 66 of the remote control transmitter 60 is input to adjust the blind to a desired height, and the stop switch 65 is input to stop the blind. Next, the stop switch 65 and the lowering switch 66 are simultaneously input for a fixed time arbitrarily determined. The microcomputer 61 sends out a lower limit setting signal after the simultaneous input continues for a predetermined fixed time. The lower limit setting signal is sent from the infrared light emitting unit 63 as an infrared remote control signal, is received by the receiving unit 69, is demodulated, and the lower limit setting signal is input to the MPU 34. The MPU34 decodes this signal and stores the lower limit setting position RA with the current height as the lower limit setting position.
Remember in M70.

The current height of the blind is detected by detecting the descending height of the blind from the position where the upper limit switch 16 is input by the method described below. The rotation of the electric motor 4 lowers the blind. The lifting shaft 12 rotates,
Further, the winding drum 37 rotates. The number of pulses from the rotation detection unit configured by the slit 373 provided on the winding drum 37 and the photo interrupter 38 is counted. The descent height is detected by the MPU 34 by counting the number of pulses from the upper limit position. When the lower limit setting signal is input to the MPU 34 as the lower limit setting position, the MPU 34 stores the number of pulses at that time in the lower limit setting position storage RAM 70. After that, even if the blind that had a rising command went up, the MPU 34 counted the number of pulses from the photo interrupter 38,
The height from the upper limit position is always known by calculation.
To stop the raising of the blind, enter the stop switch 65 of the remote control transmitter 60. When lowering the blind, the down switch 66 is input. The MPU 34 counts and calculates the number of pulses from the photo interrupter 38. The lower limit setting position stored in the RAM 70 of the MPU 34 and the number of pulses at the current position are compared by the above lower limit setting operation. If the pulse numbers match, the MPU 34 determines that it is the lower limit setting value and stops the descent of the blind. After that, even if the raising and lowering operation of the blind is performed, if the lower limit setting value is reached, the lowering of the blind is stopped.

Next, the cancellation of the lower limit position setting of the electric blind according to the present invention will be described. The lower limit position is set as described above.To cancel the lower limit setting position, set the stop switch 65 and the lift switch 64 at the same time, or within the arbitrarily set time after the stop switch 65 is input.
Input 64 continuously for a fixed period of time. With this simultaneous input signal, the microcomputer 61 sends a lower limit release signal. This lower limit cancellation signal is sent out via the infrared sending unit 63.
The infrared signal is received by the receiving unit 69, demodulated, and the lower limit cancellation signal is input to the MPU 34. The MPU 34 clears the lower limit setting position stored by the above operation stored in the lower limit setting storage RAM 70 by the lower limit release signal. As a result, the setting of the lower limit position is canceled.

[Effects of the Invention] As described above, according to the present invention, since the blind descending position height setting means is provided in the command means such as a wireless remote control transmitter which is provided separately from the blind body, the high place is high. It is possible to set the descent position height of the blind at the position of the command means such as a wireless remote control transmitter, which is separated from the head box provided in. Therefore, even after the electric blind is attached to the window frame, the descent height of the blind can be easily adjusted. Moreover, there is an effect that it is possible to easily change even after setting once. As a result, workability during construction and workability during blind assembly are significantly improved, omission or combination of lower limit switches can be reduced, complexity of lower limit switch settings and setting errors can be prevented, and cost is also reduced. There is also an effect such as possible.

[Brief description of drawings]

FIG. 1 is a diagram showing a main part of a blind winding mechanism according to an embodiment of the present invention, FIG. 2 is a diagram showing an electrical configuration of an embodiment of the present invention, and FIG. FIG. 4 is a perspective view showing a blind winding mechanism, FIG. 4 is a view showing a main part of a remote control transmitter, and FIGS. 5 and 6 are flowcharts showing a lower limit position setting procedure of an electric blind according to the present invention. Is. In the figure, 2 is a controller, 3 is a control unit, 4 is a geared motor, 6, 7 and 8 are lifting units, 10 is a lifting tape, 11 is a ladder cord, 12 is a lifting shaft, 13 is a slat, 14 is a bottom rail, 33 is a motor drive circuit, 34 is
MPU, 37 are take-up drums, 38 and 41 are photo interrupters, 3
9 is a ladder drum, 42 is a lower limit position setting switch, 60 is a remote control transmitter, 61 is a microcomputer, 62 is a power supply section, 63 is an infrared light emitting section, 64 to 68 are operation switches, 69 is a receiving section, 70 is a lower limit setting Shows location memory RAM.

Claims (1)

[Claims] 1. An electric blind that raises and lowers a blind according to the rotation of an electric motor, wherein a plurality of blades connected by a string-shaped member and the electric motor and the electric motor rotate to rotate the string. A blind body that includes a head box that houses a drum that winds or unwinds a strip-shaped member to raise and lower the blind, and a blind main body that is provided separately from the blind main body. Commanding means for commanding ascending or descending, receiving means for receiving a command signal from the commanding means, and transmitting the received signal to the head box, descent of the blind provided in the commanding means Lower limit position setting means for setting the lower limit position for setting the lower limit position to an arbitrary position, And pulse signal generating means for generating a pulse signal according to the rotation of the drum, and counting pulse signals generated by the pulse signal generating means in response to an ascending or descending command from the commanding means, Storage means for rewritably storing the pulse count value at any position set by the lower limit position setting means, counting pulse signals generated from the pulse signal generating means, and the count value by the lower limit position setting means. A discriminating unit that discriminates whether or not the set value matches, and a descent command from the commanding unit, rotates the electric motor in response to a signal received by the receiving unit, and causes the drum to perform the string-like member. Rewind to lower the blind, and the discriminant means makes the count value coincide with the value set and stored by the lower limit position setting means. A descending height setting device for an electric blind, comprising: a control unit that stops the electric motor in response to the determination.