JP2883567B2 - Electric blind lowering height setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a descent height setting device for an electric blind, and more particularly to a descent height setting device for an electric blind capable of easily designating and releasing a descent position of the blind. is there.

[0002]

2. Description of the Related Art A conventionally proposed apparatus for setting a descent height of an electric blind comprises a speed reduction mechanism utilizing rotation of an elevating shaft and a cam. That is, the number of rotations of the elevating shaft is reduced, and the electric motor is stopped by opening / closing a contact such as a micro switch linked to a cam or the like. To change the descent height, adjust the threaded bolt of the cam that turns on and off the micro switch in the speed reduction mechanism, thereby stopping the motor early or late, and consequently the motor is stopped. 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.

[0003]

However, in such a conventional method of setting the descent height using the electric blind, the position of the cam is adjusted so that when the descent height is set, the electric blind must be used. The blind had to be set down on a window frame, lowered according to the height of the window frame, attached to the blind, and adjusted by a cut-and-try method while operating the electric blind at the site. For this reason, there is a drawback that a large amount of time and a large amount of labor are required for adjusting the attachment to the window frame. In addition, the frictional state and position of the cam change due to long-term use and changes over time, and the height of the drop changes.Each time, the height of the drop must be adjusted manually. However, there is a disadvantage that the combination mechanism is complicated and the cost is high.

[0004] Therefore, a main object of the present invention is to provide a descent height setting device for an electric blind which can eliminate the adjustment work and can lower the blind to a set position.

[0005]

SUMMARY OF THE INVENTION The above object of the present invention is as follows.
The descent position height setting means of the electric blind is provided in a command means such as a wireless remote control transmitter provided separately from the blind body, and the descent position height is set from the command means such as the remote control transmitter. Can be achieved.

That is, a descent height setting device for an electric blind according to the present invention is an electric blind for raising and lowering the blind in accordance with the rotation of the electric motor, and includes a plurality of blades connected by a string-like member, the electric motor and the motor. The blind body that rotates in response to the rotation of the electric motor and includes a head box that houses a drum for winding or rewinding the string-shaped member and raising and lowering the blind, and is separated from the blind body. A command means for commanding the blind to move up or down or stop by a wireless remote control means, for receiving a command signal from the command means, and transmitting the received signal to the head box. Receiving means and the command means, wherein the simultaneous inputting of the command means such as descent and stop causes the Lower limit position setting means for setting a lower limit position at which the command lowers to an arbitrary position; and elevating signal generating means provided in the head box and generating a signal for detecting an elevating position according to the rotation of the drum. Memory means for counting a signal generated from the pulse signal generating means according to an ascending or descending command from the commanding means, and rewritably storing a signal count value at an arbitrary position set by the lower limit position setting means. A counting means for counting signals generated by the elevation signal generating means, determining whether or not the counted value matches a value set by the lower limit position setting means, and a lowering command from the commanding means. Rotating the electric motor in accordance with the signal received by the receiving means, rewinding the string-shaped member by the drum and lowering the blind, Control means for stopping the electric motor in response to the step determining that the count value matches the value set and stored by the lower limit position setting means; and a lower limit set by the lower limit position setting means. And a lower limit position setting canceling means for canceling the position by simultaneous input such as raising and stopping of the command means.

A descent height setting device for an electric blind according to the present invention sets a descent height from a wireless commanding device provided separately from a blind body and receives a command signal from the commanding device. The signal transmitted to the blind through the blind is counted, and a signal for detecting an ascending / descending position generated in accordance with the rotation of the drum when the blind is lowered is counted, and a count value corresponding to the blind descent height is set to a preset lower limit. If it matches the position, the blind descent is stopped, so complicated adjustment work can be unnecessary, and the blind descent position can be set from wireless remote control type command means corresponding to any window frame it can. In addition, the lower limit position set by the lower limit position setting means can be easily released from the wireless remote control type command means by the lower limit position setting release means which is released by simultaneous input such as raising and stopping the command means.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As means for solving the conventional problems, for example, a head box for accommodating a blind raising / lowering device, a command means for commanding the blind to move up or down, a head box In the electric blind comprising a plurality of blades provided below and connected by the string-shaped member, the electric blind is provided in the head box, rotates according to the rotation of the electric motor, and winds or rewinds the string-shaped member. A drum for raising and lowering the blind, pulse signal generating means for generating a pulse signal in accordance with the rotation of the drum, and lower limit position setting means using a dip switch capable of setting the lower limit position of the blind to an arbitrary value; , And counts the generated pulse signals, and determines whether or not the counted value matches the value set by the lower limit position setting means. Another means, the electric motor is rotated in response to the lowering command, the string-shaped member is rewound by the drum, the blind is lowered, and it is determined that the count value matches the value set by the lower limit position setting means. It is conceivable to comprise a control means for stopping the electric motor in accordance with the above.

However, in the above-mentioned lower limit position setting means for the electric blind, a lower limit setting switch is provided in a control unit built in the head box, and the lower limit of the lowering of the blind is set by a combination of the switches. In this setting, a combination of switches is appropriately selected at a factory according to the height of the window to be installed, and the height is set to the height of the window. However, if the height of the window is set incorrectly or the lower limit setting switch of the blind is set incorrectly, the blind will not fall down at the bottom of the window frame after mounting on the window, and there will be a gap, or the blind will hit the bottom of the window frame. Defectives such as loosening of the entire blind occur. To change this, it is necessary to change the setting of the lower limit setting switch and reset it at the installation site so that it is positioned 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 work of resetting the lower limit setting switch is very poor because the head box is located above the window etc.
At a site where many blinds are installed such as a conference room, the work efficiency is significantly reduced. Also, if you follow a potted plant or other figurine at the bottom of the window frame after installing the blinds, in order to prevent the lower part of the blind from hitting these when lowering the blinds, the lowering of the blind each time you lower it It is necessary to stop the lowering of the blinds while watching or to reset the lower limit setting switch as described above. However, it is generally necessary to ask the construction company that installed the blinds to make this change.

[0011] To summarize the above problems, the above-described device for setting the descending position of the electric blind has the following problems.

(I) After the blind is installed on a window or the like, changing the lower limit setting switch provided in the control unit in the head box is extremely inefficient in work and cannot be easily changed.

(Ii) In order to make the range of setting the lower limit finer, it is necessary to increase the number of combinations of the lower limit switches, which increases the number of lower limit switches and increases the cost. Further, the setting operation becomes complicated.

Therefore, in the present invention, the above-mentioned problem is solved by setting the descent position height of the electric blind as follows.

First, referring to FIGS. 1, 2 and 3,
An appearance 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 of the electric blind according to the present invention. FIG. 3 is a perspective view for describing details of a blind winding mechanism.

The electric blind according to the present invention comprises a slat 13, a head box 15 in which a device for vertically driving the slat 13 is accommodated, a controller 2 for controlling the up and down movement of the slat 13, a command for raising and lowering the slat 13. And an infrared remote control transmitter 60 for performing the operation. The head box 15 includes lifting units 6, 7, 8 for raising and lowering the slats 13 by lifting 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 slat 13, a stop switch 22 for stopping the movement of the slat, a lowering switch 23 for lowering the slat 13, an open switch 24 for opening the slat, and a slat. Closing switch 25 for closing the
And a receiving unit 69 for receiving an infrared signal from the infrared remote control transmitter. The receiving unit 69 does not need to be built in the controller 2, and may be provided separately 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 and a power supply unit.

There are various known configurations of the receiving unit 69, and thus the details are omitted. As a function, an infrared signal (generally 38 kHz) transmitted from the remote control transmitter 60 is used.
Pulse modulation is performed by a remote control signal using a frequency such as z as a carrier. ), Demodulates the modulated infrared signal, and returns it to the remote control signal. This remote control signal is input to the MPU 34. The MPU 34 captures the remote control signal, decodes a command signal from the remote control transmitter 60, and controls the blind according to the command. The remote control transmitter 60 includes five operation switches, an up switch 64, a stop switch 65, a down switch 66, and a slat open switch 67 and a slat close switch 68.

A geared motor 4 composed of 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 a lifting shaft 12 via a coupling 5. The lifting units 6, 7 and 8 are connected to the lifting shaft 12. Sensors, failure switches (not shown), and upper limit switches 16 built in these lifting units 6, 7 and 8 are connected to the control unit 3 by wiring members 9. The wiring member 9 includes a wiring to the geared motor 4 and a connection 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.

The winding drum 37 has a lifting tape 1
0 (which may be a string) is fixed at one end. The other end of the lifting tape 10 passes through the holes 13a of the plurality of slats 13 and
It is fixed to. Then, the winding drum 37 winds or rewinds the lifting tape 10 with the rotation of the elevating shaft 12 to move the slats 13 and the bottom rail 14 up and down. Further, 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.

The ladder cord 11 is formed as a pair of two ladder cords 11a and 11b at intervals corresponding to a width of the slat 13 of, for example, 50 mm, 25 mm or 15 mm. The slats 13 are connected by a horizontal string 11c at intervals corresponding to the pitch p, for example, in a ladder shape. The slat 13 is inserted and held in a ladder-like space composed of ladder cords 11a and 11b and a lateral cord 11c. The ladder drum 39 rotates with the rotation of the elevating shaft 12, and controls the degree of opening of the slat. The bottom rail 14 functions as a weight for lowering the blind and 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 composed of a head box 15 forming an outer box.
Covered by An upper limit switch 16 is provided at a lower portion of the head box 15. The upper limit switch 16 is provided when the blinds are wound up.
3 to operate to detect the upper limit position.
In addition, the upper limit switch 16 may be configured by an electronic switch such as an optical sensor.

Next, an electrical configuration of an embodiment of the present invention will be described with reference to FIG. Power transformer 31
, AC power is input via a power cord 1. The power transformer 31 lowers the input AC power to supply a low voltage to the stabilizing power supply 32, thereby generating power required for the controller 3 and the geared mod 4. A motor drive circuit 33 is connected to the MPU 34, and controls the geared motor 4 in a forward 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 terminals of the geared motor 4 via the motor drive circuit 33. In this way, by short-circuiting the input terminals of the geared motor 4, You can put a brake on That is, for example, when a rotational force is mechanically applied to the geared motor 4 as in the case of inertia due to the descent of the blind or the case where the blind is artificially pulled strongly in the descending direction, the principle of the DC motor is Generates a back electromotive force.

Then, by short-circuiting the input terminals, a current for preventing the rotation, that is, a current for reverse rotation flows, and the geared motor 4 stops.
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 a lowering position of the electric blind described later. RAM
Numeral 70 is a section for storing the height of the lowering position of the blind inputted from the remote control transmitter 60.

The failure switch 36 is built in the lifting units 6 and 8, and as an example of a trouble, when the blind hits an obstacle or the like while the blind is descending and the descending operation is stopped, the geared motor 4 is stopped.
Continues rotating in the descent direction, the lifting tape 10
Is loosened, and if this continues, the lifting tape 10 deviates from the winding drum 37, and the lifting tape 10 cannot be wound up even if the blinds are to be raised next, resulting in a significant failure.

In order to prevent this, the looseness of the lifting tape 10 is detected by a mechanical switch or an optical or magnetic sensor as a conventional technique, and the detected output is input to the MPU 34 and transmitted through the motor drive circuit 33. The geared motor 4 is stopped. Thereby, the motor drive circuit 33 is set to the brake mode. Further, the MPU 34 reverses the blinds for an arbitrary time after the stop of the geared motor 4, winds up the blind, eliminates the loosening of the lifting tape 10, and then stops the geared motor 4.

The winding drum 37 winds or rewinds the lifting tape 10 with the rotation of the geared motor 4 and raises and lowers the blinds. The winding drum 37 includes guides 371 and 372 for the lifting tape 10. For example, a slit 373 is provided around the guide 371.
Are formed. In addition, a disc may be attached to another portion of the elevating shaft 12 separately from the winding drum 37 to form a slit in the disc, and rotation of the elevating shaft 12 may be performed.
Alternatively, even if the rotation of the motor shaft of the geared motor 4 is detected, the same effect can be obtained, so that 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 interruption 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 to the MPU 34. That is, the MPU 34 controls the winding drum 37
, The amount of lifting or lowering of the lifting tape 10 can be known 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 slat 13 to change the input amount of external light.
The interior is adjusted to an appropriate brightness and external light is blocked.

The ladder drum 39 is fitted with a frictional force via a drum shaft 40 penetrating the elevating shaft 12. The elevating shaft 12 and the drum shaft 40 rotate integrally (synchronously). However, when the ladder drum 39 rotates approximately half a turn, the rotation of the ladder drum 39 is stopped by a projection (not shown) provided by the head box 15 or the like. And slips with the drum shaft 40 and idles. When the elevating shaft 12 is inverted, the ladder drum 39 is also inverted in the same manner, but hits a projection such as the head box 15 and idles in the same manner as described above. When the rudder drum 39 rotates approximately half a turn, the slat 1
3 rotates, and the angle of the slat 13 changes.

That is, the slats 13 are opened from the closed state inclined to the indoor side to the horizontal state, and are changed to the closed state inclined to the outdoor side. When the elevating shaft 12 rotates in the direction opposite to the above description, the rotation of the slat 13 is reversed. That is, it is opened from a state of being inclined and closed on the outdoor side to a horizontal state, and is a state of being inclined and closed on the indoor side.

At one end of the ladder drum 39, a slit 391 for detecting the rotation of the ladder drum 39 is formed. Insert this slit 391 into the ladder drum 39
Is formed at an angle corresponding to approximately half a rotation of the photomask, 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 and converts it into an electric signal.
Give to PU34. The MPU 34 can know the angle of the ladder drum 39, that is, the angle of the slat 13, according to the electric signal. The lower limit position setting switch 42 is for setting the lower limit position when the blind is lowered, and in this embodiment, is constituted by four switches.

The switches 21 to 21 of the controller 2
25, the clock generation circuit 43 and the reset circuit 44 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. The remote control transmitter 60 includes a microcomputer 6 that generates a remote control signal according to the input of the up switch 64, the stop switch 65, the down switch 66, the slat open switch 67, and the close switch 68.
An infrared light emitting unit 63 for transmitting a signal generated by the microcomputer 61 as an infrared signal;
2 is included. Note that the carrier modulated by the remote control signal, for example, 38 kHz or the like may be made by the microcomputer 61 or may have an oscillator in the infrared light emitting unit 63, but either may be used. The power supply 62 generally uses a dry battery.

Next, the operation of the remote control transmitter will be described. When the up switch 64 of the remote control transmitter 60 is input, the microcomputer 61 receives the input and sends an up signal to the infrared light emitting unit 63. The infrared light emitting section 63 sends out an infrared signal. This infrared signal is received by the receiving section 69 provided in the controller 2 and demodulated, and the remote control signal is M
It is input to PU34. The MPU 34 decodes the signal, determines that the signal is a rising signal, and raises the slat 13 through a series of operations.

Similarly, the down switch 66 of the remote control transmitter 60, the open switch 67 of the slat, and the close switch 6
When 8 is input, the microcomputer 61 sends out a remote control signal according to each of them to the receiving section 69 via the infrared light emitting section 63. After these signals are demodulated, they are input to the MPU 34, which decodes these signals and controls the blinds according to the respective commands. To stop the operation of the blind, the stop switch 65 of the remote control transmitter 60 is used.
Is input, the MPU 34 decodes the stop signal through the same path as above, and stops the operation of the blind.

The opening and closing of the slats is performed as follows. For example, the slat open switch 67 is input to adjust the slat angle. When the desired slat angle is reached, release switch 67 is released and stop switch 65 is input. As a result, the angle of the slat stops at the desired angle. However, when the slat opening switch 67 is released and the stop switch 65 is input to stop the operation of the slat after visually confirming that the desired slat angle has been obtained, the following problem occurs.

That is, from the visual confirmation, the stop switch 65
And the microcomputer 61 sends a stop signal, the MPU 34 decodes the stop signal via the infrared transmitter 63 and the infrared receiver 69, and stops the operation of the slats. Processing time is delayed. As a result, it is difficult to adjust to a desired slat angle. The operating time of the slat is fast, and the slat does not stop at the desired slat angle.

In order to prevent this, the microcomputer may determine that these inputs have disappeared by releasing the inputs to the slat open switch 67 and the close switch 68. The microcomputer 61 is programmed to send the stop signal as described above. In this way, when the slat angle reaches the desired position, the slat open switch 6
7 or the release of the closing switch 68, the microcomputer 61
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, and is decoded to stop the operation of the slat. With respect to ascent and descent, 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 power is supplied to the power cord 1, the AC power is converted to a low voltage by the power transformer 31 and supplied to the stabilized power supply 32. The stabilized power source is the stabilized power source V required for the control unit.
A power supply VM for driving the cc and the geared motor 4 is created. First, when raising the blind, the raising switch 64 provided on the remote control transmitter 60 is operated. The MPU 34 receives a signal from the up switch 64 and supplies an intermittent signal to the motor drive circuit 33 to close the slat 13.

In response, the motor drive circuit 33 rotates the geared motor 4 intermittently. When the geared motor 4 is intermittently rotated, the rotational force intermittently rotates the elevating shaft 12 via the coupling 5. 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, as a result, if one of the ladder cords 11, for example, the ladder cord 11 b side is wound up while rotating slowly, the ladder cord 11 a descends. That is, the ladder drum 3
By rotating 9 in the direction of the arrow in FIG. 3, the ladder cord 11b is raised and the ladder code 11a is lowered. Thereby, the slat 13 rotates in the direction of the arrow, and enters the closed state.

The ladder drum 39 rotates, a slit 391 provided in the ladder drum 39 interrupts the output signal of the photo interrupter 41, and the pulse signal is
34. When the ladder drum 39 further rotates, that is, when the slat 13 is gradually closed, the MPU 34 sequentially counts the pulse signals. When the ladder drum 39 rotates until the slat 13 is completely closed, a projection (not shown) provided on the ladder drum 39 is provided.
Hits a projection (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 the slat 13 has been closed. The MPU 34 is connected to the up switch 6 of the remote control transmitter 60.
After the operation of 4, the number of pulses of the pulse signal output from the photo interrupter 41 is counted, and the count value is stored in the memory (not shown) in the slat 13 as a movement angle.

Next, the MPU 34 is connected to the photo interrupter 4
When the pulse signal from 1 is no longer given, 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 operation of winding up the blind.

That is, as the geared motor 4 rotates continuously, the winding drum 37 rotates continuously and winds the lifting tape 10. Since the other end of the lifting tape 10 is fixed to the bottom rail 14, the lifting tape 10 sequentially rises from the lowermost part of the slat 13. To stop raising the blind, the stop switch 65 provided on the remote control transmitter 60 is operated. The MPU 34 provides 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, brakes the geared motor 4 and stops it. Since this is a well-known technique, a detailed description thereof will be omitted.

Next, as described above, in order to return to the angular position of the slat 13 stored in the MPU 34, the MPU
34 supplies a reverse intermittent signal to the motor drive circuit 33 to reverse the rudder drum 39 in the direction opposite to the arrow shown in FIG. As a result, the ladder code 11 performs an operation reverse 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 photointerrupter 41, and if the count value matches the count value input at the time of rising, the MPU 34 gives a signal for stopping the geared motor 4 to the motor drive circuit 33, and 4 is stopped. As a result, the blind stops and the slats 13
The angle is automatically adjusted.

The operation for lowering the blind is performed by operating a lowering switch 66 provided on the remote control transmitter 60. The lowering of the blind is performed by performing an operation generally opposite to the above-described raising. When the stop switch 65 of the remote control transmitter 60 is operated, the geared motor 4 stops at that point and the blind stops. Further, the angle of the slat 13 is automatically adjusted to the angle before descending in the same manner as described above.

Although the above operation is performed from the switch provided on the remote control transmitter 60, the controller 2 has the same switch, so that the controller 2 can perform the operation.

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

FIGS. 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 remote controller 60. The lower limit position setting procedure of the electric blind according to the present invention will be described with reference to FIGS.

First, the raising switch 6 of the remote control transmitter 60
4 or the descent switch 66 is input to adjust the blind to the desired height, and the stop switch 65 is input to stop the blind. Next, the stop switch 65 and the descent switch 66 are simultaneously input for an arbitrary predetermined time. Microcomputer 61
After this simultaneous input continues for a fixed period of time,
Sends the lower limit setting signal. This lower limit setting signal is transmitted as an infrared remote control signal from the infrared light emitting section 63, received by the receiving section 69, demodulated, and the lower limit setting signal is output from the MPU 34.
Is input to The MPU 34 decodes this signal and stores the current height in the lower limit setting position storage RAM 70 as the lower limit setting position.

The current height of the blind is determined by the upper limit switch 1
6 is detected by detecting the descent height of the blind from the input position by the method described below. The blind descends due to the rotation of the electric motor 4. The elevating shaft 12 rotates, and the winding drum 37 further rotates. The number of pulses from the rotation detecting unit constituted by the slit 373 provided in the winding drum 37 and the photo interrupter 38 is counted. By counting the number of pulses from the upper limit position, the drop height is detected by the MPU 34. Lower limit setting signal is MPU as lower limit setting position
34, the MPU 34 stores the lower limit set position memory R
The number of pulses at that time is stored in the AM 70. Thereafter, even if the blind for which the raising command is issued rises, the MPU 34 counts the number of pulses from the photointerrupter 38 and always knows the height from the upper limit position by calculating. In order to stop the raising of the blind, the stop switch 65 of the remote control transmitter 60 is input. When descending the blind, the descend switch 66 is input. The MPU 34 counts and calculates the number of pulses from the photo interrupter 38. The RAM of the MPU 34 is operated by the operation of setting the lower limit.
The lower limit setting position stored in 70 and the number of pulses at the current position are compared. If the pulse numbers match, the MPU 34 determines that the lower limit is set and stops lowering the blind. Thereafter, even if the blind is moved up and down, the blind stops when the lower limit value is reached.

Next, the cancellation of the setting of the lower limit position of the electric blind according to the present invention will be described. The setting of the lower limit position
To release the lower limit setting position, the stop switch 65 and the up switch 64 are simultaneously operated, or the up switch 64 is arbitrarily set within a predetermined time after the stop switch 65 is input. Enter the time continuously. With this simultaneous input signal, the microcomputer 61 sends out a lower limit release signal. This lower limit release signal is transmitted via the infrared transmission unit 63. This infrared signal is transmitted to the receiving unit 6
9 and demodulated, the lower limit release signal is MPU3
4 is input. The MPU 34 clears the storage of the lower limit setting position by the operation stored in the lower limit setting storage RAM 70 in response to the lower limit release signal. As a result, the setting of the lower limit position is released.

[0054]

As described above, according to the present invention, since the blind lowering position height setting means is provided in the command means such as a wireless remote control transmitter which is provided separately from the blind main body, it can be used in a high place. The height of the blind lowering position can be set at the position of the command means such as a wireless remote control transmitter remote from the head box provided in the vehicle. Further, the setting of the descending height can be made extremely easily and reliably by simultaneous input of descending and stopping of the command means. Therefore, it is possible to easily adjust the descent height of the blind even after the electric blind is attached to the window frame. Moreover, the lower limit position once set by the lower limit position setting means is
There is an effect that the lower limit position setting canceling means, which is canceled by simultaneous input such as raising and stopping the command means, can be easily canceled from the wireless remote control type command means. As a result, the workability at the time of construction and the workability at the time of assembling the blinds are significantly improved, and the omission or combination of the lower limit switch can be reduced
It is possible to prevent the setting of the lower limit switch from being complicated and to prevent a setting error, and also to reduce the cost.

[Brief description of the drawings]

FIG. 1 is a view 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.

FIG. 3 is a view showing a blind winding mechanism.

FIG. 4 is a diagram showing a main part of a remote control transmitter.

FIG. 5 is a flowchart showing a lower limit position setting procedure of the electric blind according to the present invention.

FIG. 6 is a flowchart showing a lower limit position setting procedure of the electric blind according to the present invention.

[Explanation of symbols]

 2 Controller 3 Control unit 4 Geared motor 6, 7, 8 Elevating unit 10 Lifting tape 11 Ladder code 13 Slat 14 Bottom rail 33 Motor drive circuit 34 MPU 37 Winding drum 38, 41 Photointerrupter 39 Ladder drum 42 Lower limit position setting switch Reference Signs List 60 remote control transmitting unit 61 microcomputer 62 power supply unit 63 infrared light emitting unit 64, 65, 66, 67, 68 operation switch 69 receiving unit 70 lower limit position setting RAM

Claims (1)

(57) [Claims] 1. An electric blind for raising and lowering a blind according to rotation of an electric motor, comprising: a plurality of blades connected by a string-shaped member;
A blind main body including a head box that houses a drum for winding or rewinding the string-shaped member to raise and lower the blind; provided separately from the blind main body; Command means for commanding the raising or lowering or stopping of the blind, receiving means for receiving a command signal from the command means, and transmitting the received signal to the headbox, provided in the command means, Lower limit position setting means for setting the lower limit position where the blind descends to an arbitrary position by simultaneous input such as lowering and stopping of the command means, provided in the head box, and in accordance with the rotation of the drum An elevating signal generating means for generating a signal for detecting an elevating position, and an ascending or descending command from the command means A counting means for counting signals generated from the pulse signal generating means, a storage means for rewritably storing a signal count value at an arbitrary position set by the lower limit position setting means, and a signal generated from the elevation signal generating means. Counting, determining means for determining whether the count value matches the value set by the lower limit position setting means, and a descending command from the command means, in response to a signal received by the receiving means, The electric motor is rotated to rewind the string-like member by the drum and lower the blind, and the discriminating means determines that the count value matches the value set and stored by the lower limit position setting means. Accordingly, control means for stopping the electric motor, and the lower limit position set by the lower limit position setting means is used for simultaneous input such as raising and stopping the command means. Therefore, a descent height setting device for the electric blind, including a lower limit position setting canceling means for canceling.