JP2902585B2 - Electric blind lowering height setting device - Google Patents

Description

Description: 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 an electric motor capable of easily designating and releasing a descent position of a blind. The present invention relates to a blind height setting device. 2. Description of the Related Art A conventionally proposed apparatus for setting a descent height of an electric blind is constituted by a speed reduction mechanism utilizing the rotation of a lifting 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 by the electric blind, when the descent height is established by adjusting the position of the cam, the descent height must be set. It was necessary to install the electric blind on the window frame and lower the blind, attach it to the blind according to the height of the window frame, and adjust it by a cut-and-dry method while operating the electric blind on 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] The above object of the present invention is to provide:
This can be achieved by providing the setting of the descending position height of the electric blind in the command means such as a controller, and setting the descending position height from the command means such as the controller. That is, a lower limit position setting device for an electric blind according to the present invention is an electric blind for raising and lowering the blind in accordance with rotation of an electric motor, comprising command means for instructing the blind to move up, down, or stop. And a plurality of blades connected by a string-like member, and a drum for rotating the electric motor and the electric motor in accordance with the rotation of the electric motor to wind or unwind the string-like member to raise and lower the blind. A headbox,
In those comprising a connecting means for connecting the command unit and the headbox, is provided in the command means sets a lower limit position to drop the blind by a predetermined operation of the command means to an arbitrary position And said
Lower position setting release means for releasing the lower limit position by a predetermined operation of the command means; and a lower position setting release means provided in the connection means, wherein the lower limit position release means sets the lower limit position between the command means and the headbox. Coupling means for transmitting and receiving signals; lifting and lowering signal generating means provided in the head box for generating a position signal for detecting a raising and lowering position according to rotation of the drum; and raising or lowering from the command means Position signal generated by the elevation signal generating means according to the command
First storage unit (RAMA) for storing rewritable data sequentially
At the time of setting by the lower limit position setting canceling means,
The position signal stored in the first storage unit at the lower limit.
A second storage unit (RAMB) for rewritably storing the data as an
And when resetting the lower limit position,
Release signal of the lower limit position from the lower limit position setting release means
The lower limit already stored in the second storage unit based on
After erasing the position,
A storage unit for storing the newly set lower limit position in the second storage unit, and a position signal stored in the first storage unit,
Determining means for determining whether or not the lower limit position matches the lower limit position stored in the second storage unit; and in response to a descending command from the command means, rotating the electric motor and winding the string upper member by the drum. Control means for stopping the electric motor when the judgment means judges that the position signal coincides with the lower limit position . A descent height setting device for an electric blind according to the present invention sets a descent height from a command means and detects a raising / lowering position generated in accordance with rotation of a drum when the blind is lowered. Is counted, and if the count value corresponding to the blind descent height matches the preset lower limit position, the blind descent is stopped, so that complicated adjustment work can be made unnecessary, and The lowering position of the blind can be set from the command means in correspondence with the window frame of (1). [0008] Means for solving the conventional problems include, for example, a head box for accommodating a blind elevating device, and command means for instructing the blind to be raised or machined. In an electric blind provided below the head box and comprising a plurality of blades connected by a string-shaped member, the electric blind is provided in the head box, rotates according to the rotation of the electric motor, and winds or winds the string-shaped member. A drum for returning and raising and lowering the blind, a pulse signal generating means for generating a pulse signal according to the rotation of the drum, and a lower limit position using a dip switch capable of setting a lower limit position of the blind to an arbitrary value Setting means for counting the generated pulse signals, and determining whether the counted value matches the value set by the lower limit position setting means Determining means, and rotating the electric motor in response to the lowering command, rewinding the string-like member by the drum, lowering the blind, and determining 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 response to the determination. 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, an external configuration of an embodiment of the present invention will be described with reference to FIGS. Referring to FIG. 2, a conventional electric blind includes a slat 13, a head box 15 accommodating a device for vertically driving the slat 13, a controller 2 for controlling the up and down movement of the slat 13, a controller and a head. And a connection cord 20 for connecting to the box. The head box 15 includes lifting units 6, 7, 8 for raising and lowering the slats 13 by raising and lowering the ladder cord 11, a geared motor 4 for rotating the lifting unit, and a control unit for controlling 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, a slat, And a close switch 25 for closing the switch. The power cord 1 and the controller 2 are connected to the control unit 3. The control unit 3 includes a microcomputer, a power supply unit, and the like. A geared motor 4 constituted by 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 shaft 12 includes
The lifting units 6, 7, and 8 are connected. 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. Lifting units 6 and 8
Includes a winding drum 37 and a ladder drum 39, and the elevating unit 7 includes only the ladder drum 39. Lifting tape 1 is mounted on winding drum 37.
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 the 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 elevating 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.
It is pressed to operate by the 3, 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. FIG. 4 is a schematic block diagram of an embodiment of the present invention. 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 microcomputer (hereinafter, referred to as an MPU) 34 is connected to a motor drive circuit 33, 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 through 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. Therefore, by short-circuiting between the input terminals, this rotation is prevented,
That is, a current for reverse rotation flows, and the geared motor 4
Will stop. 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 RAMA and RAMB for setting the lowering position of the electric blind described later. RAMA is a photointerrupter 38 described later.
This is a part that always counts the blind height from the upper limit position by counting the intermittent signal from the upper limit and calculating the count number. The RAMB is a section that stores the height of the blind drop position input from the controller. The obstacle 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 slackness 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 via 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 blind. 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 connection 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 30. 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 slat 13 is opened from the closed state inclined to the indoor side to the horizontal state, and is further 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 2 of the controller 2
5. The clock generation circuit 43 and the reset circuit 44
Connected to PU34. FIG. 1 is a flowchart for explaining a specific operation of one embodiment of the present invention. Next, a specific operation of the embodiment of 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 supply generates a stable variable power supply Vcc necessary for the control unit and a power supply VM for driving the geared motor 4. First, when raising the blind, the raising switch 21 provided in the controller 2 is used.
Operate. The MPU 34 receives a signal from the up switch 21 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, the ladder drum 39 winds one of the ladder cords 11, for example, the ladder cord 11b, while slowly rotating . Then, it goes down the paired ladder code 11a. 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 the projection 45 shown in FIG. 3, and the ladder drum 39 idles. Therefore, the pulse signal from the photo interrupter 41 is not given to the MPU 34. Accordingly, M
The PU 34 determines that the slat 13 has been closed.
Further, the MPU 34 counts the number of pulses of the pulse signal output from the photo interrupter 41 after the up switch 21 is operated, and stores the counted value as a moving angle of the slat 13 in a memory (not shown). 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 22 provided on the controller 2 is operated. MPU34 is the stop switch 2
A stop signal is given to the motor drive circuit 33 in response to a command from the control unit 2. 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
Brake the vehicle to stop. 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 23 provided on the controller 2. The lowering of the blind is performed by performing an operation generally opposite to the above-described raising. By operating the stop switch 22 of the controller 2,
At that time, the geared motor 4 stops 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. Next, a method of setting the lowering height of the blind will be described. The setting of the descent height of the blind according to the present invention is performed using a stop and descent switch provided in a conventional controller. In addition to the setting of the descending position, the setting by the dip switch described in the related art may be used together. FIG. 1 is a flowchart showing the procedure for setting the lower limit position of the electric blind according to the present invention. This will be described below with reference to FIG. When the up switch 21 is input, the MPU 34 rotates the geared motor 4 via the drive circuit 33, and the blind rises. If there is no input from the controller 2, the blind rises until the upper limit switch 16 is pressed by the slat 13, and the upper limit switch 1
When there is an input of 6, the MPU 34 receives this input and stops the geared motor 4 via the motor drive circuit 33.
The blinds stop. At this time, the blind is located at the uppermost limit. At the same time when the upper limit switch 16 is input, the MPU 34 initializes the height data and sets this position as the upper limit value. Next, when the descent switch 23 of the controller 2 is input, the blind starts descent. At the same time as the descent starts, the photo interrupter 38 inputs an intermittent signal to the MPU 34 through the slit 373 provided in the winding drum 37. The MPU 34 knows the number of rotations of the winding drum 37 by counting the intermittent signal, and knows the amount of drop (height) of the blind. It is visually confirmed that the blind height has dropped to the desired lower limit, and the stop switch 22 provided on the controller 2 is input. Upon receiving this input, the MPU 34 stops the geared motor 4 via the motor drive circuit 33 (brake mode). The blinds stop. At this time, the MPU 34 stores the count number of the intermittent signal from the photo interrupter 38 in the RAMA. After confirming that the blind is located at the desired lower limit, the stop switch 22 provided on the controller 2 is first pressed, and then the descent switch 23 is simultaneously inputted for an arbitrary set time (for example, 2 seconds).
Receives the input, sets the current blind position as the lower limit, and sets the count number as the lower limit value A in the RAM.
Store it in B. The reason why the stop switch 22 is first inputted first is as follows. As soon as another switch (up / down, angle opening / closing) is input, the blind operates according to the input. To prevent this, first stop switch 2
If 2 is input and then the down switch is input, the blind will not operate. While the stop switch 22 is being input, the blind does not operate even if other switches are input. (The geared motor 4 remains stopped). In this state, when the blind is raised by operating the raising switch 21 of the controller 2, the MPU 34 counts the intermittent signal from the photo interrupter 38,
The height from the upper limit position is always calculated, and the count number of the intermittent signal from the upper limit position is stored in the RAMA. When the stop switch 22 is operated to stop the blind, and then the descent switch 23 is operated to lower the blind, the intermittent signal from the photo interrupter 38 is counted from the position, and the height is calculated from the upper limit position. Are sequentially stored in the RAMA. The intermittent signal corresponding to the height from the upper limit position is counted, and RAMA and RAMB are compared. If this value matches the lower limit value A, the microcomputer 34 determines that the blind has dropped to the lower limit. Then, the geared motor 4 is stopped (the brake mode) via the drive circuit 33.
The blind is stopped, and the blind is stopped at the lowest position by the simultaneous operation of the stop switch 22 and the descent switch 23 from the controller 2. The lowermost position set by the controller 2 by the simultaneous operation of the stop switch 22 and the lowering switch 23 is released by the simultaneous operation of the stop switch 22 and the uppering switch 21. That is, RAMB is erased. In this case as well, the stop switch 22 is input first, and then the up switch 21 is input. The lowermost limit at this time depends on the setting position of the lower limit switch 42. With the same idea, the angle of the open switch 24 and the stop switch 22 provided in the controller 2 are simultaneously inputted to the controller 2 to store the current blade angle, and the close switch 25 and the stop switch 22 are simultaneously operated. By inputting, the memory of the blade angle can be erased, and it is easy to always set a constant blade angle after ascending and descending. However, when changing the lower limit value of the blind, the controller 2 is used as described above.
After the stop switch 22 and the up switch 21 are simultaneously inputted for an arbitrary time, the RAMB storing the lower limit value A is erased, and the blind is raised or lowered to the changed position. What is necessary is just to input the descent switch 23 simultaneously. Its position of the blind is stored newly in the RAM B, this value becomes the new top limit value A, when subsequently drops the blind, if the new lowest limit value A and RAMA match, the blind stops as the lowest limit Will be. As described above, according to the present invention, since the blind lower limit position height setting means is provided in the command means such as the controller, the present invention is similar to a controller separated from the head box provided at a high place. The lower limit position height of the blind can be set by the position of the command means . And wanted <br/> Te blind electric blind even after it attached to the window frame
The lower limit position can be easily adjusted. In addition, there is an effect that the change can be easily made even after setting once. As a result, the workability at the time of construction and the workability at the time of assembling the blind are remarkably improved . When resetting the lower limit position,
Set the lower limit position to a position lower than the already set lower limit position
When resetting, the previously stored lower limit position was deleted.
Then lower the blinds to the lower limit at the desired position.
Special mode for setting the lower limit position
It is not necessary to set it, and it is easy to reset the lower limit position with a simple configuration.
Can be determined. In addition, when the lower limit position is reset, the
Only the second storage unit is stored in the first storage unit.
Position signal is not erased, so the current height is always maintained
can do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart for explaining a specific operation of one embodiment of the present invention. FIG. 2 is a diagram showing an outline of an embodiment of the present invention. FIG. 3 is a diagram showing a main part of a blind winding mechanism. FIG. 4 is a schematic block diagram of an embodiment of the present invention. [Description of Signs] 2 Controller 3 Control unit 4 Geared motors 6, 7, 8 Lifting unit 10 Lifting tape 11 Ladder coat 12 Lifting shaft 13 Slat 14 Bottom rail 33 Motor drive circuit 34 Microcomputer 37 Winding drum 38, 41 Photo interrupter 39 Rudder drum 42 lower limit position setting switch

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E06B 9/32 E06B 9/264 E06B 9/68-9/88 H02P 1/22

Claims (1)

(57) [Claims] An electric blind that raises and lowers a blind in accordance with rotation of an electric motor, comprising: command means for instructing raising, lowering, or stopping of the blind; a plurality of blades connected by a string-shaped member; It rotates according to the rotation of the motor,
A head box that houses a drum for winding or unwinding the string-shaped member and raising and lowering the blind; and a connection unit for connecting the head box and the command unit. provided means, the lower limit position to drop the blind by a predetermined operation of said command means and sets an arbitrary position, said by a predetermined operation of said instructing means
Lower limit position setting release means for releasing a lower limit position; coupling means provided in the connection means for transmitting and receiving a signal relating to the set lower limit position between the command means and the headbox; provided in the head box, the lifting signal generating means for generating a position signal for detecting a vertical position in response to rotation of the drum, raised or position generated from the lift signal generating means according to the command of the descending from said command means Signals can be sequentially rewritten
A first storage unit (RAMA) for storing the lower limit position,
At the time of setting by the setting release means, the first memory
The position signal stored in the unit can be rewritten as the lower limit position.
And a second storage unit (RAMB) for storing the
When resetting the lower limit position, the lower limit position setting solution
The second position based on the release signal of the lower limit position from the release means.
Deleted the lower limit position already stored in the storage unit
Later, the lower limit position setting release means newly sets
Storage means for storing the lower limit position in the second storage unit, and a position signal stored in the first storage unit,
A determination unit that determines whether or not the lower limit position is stored in the unit; and, in response to a descending command from the command unit, rotating the electric motor and rewinding the string member by the drum. The blind is lowered and the position is determined by the determining means.
In response to the preamble signal matches with the lower limit position it is determined, composed of a control means for stopping the electric motor
Electric blind drop height setting device, characterized by.