JPH0416590B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric blind, and in particular, a method for raising and lowering a plurality of blades (slats) of the blind and adjusting the angle of the slats in accordance with the rotation of a DC motor. Regarding motorized blinds.

[Prior Art] FIG. 4 is an electrical circuit diagram of a conventional electric blind. The conventional electric blind shown in FIG. 4 is described in Japanese Utility Model Publication No. 56-17676. A conventional electric blind will be briefly explained with reference to FIG. An alternating current power source of AC100V is applied between terminals 51 and 52. The up switch 53 and the down switch 54 operate in conjunction, and when the up switch 53 is closed, the down switch 5
4 will be opened. When the up switch 53 is closed, the normally closed contact 72 of the down relay and the release relay 6 are closed.
1. The connection part a is connected via the upper limit switches 81 and 82, the normally closed contact 74 of the lowering relay, and the motor controller 58.

Also, one end of the normally closed contact 74 of the lowering relay 71 is connected to one end of the normally open contact 75 of the lowering relay 71, and further connected to the terminal 52 via the fuse 59. Therefore, when the lift switch 53 is closed, the lift relay 61 is energized, the contact 62 of the lift relay 61 is opened, and the normally open contact 64 is closed. As a result, current flows through the path of terminal 51 - normally open contact 64 - connection point a - motor 57 - motor controller 58 - normally closed contact 74, one end of normally open contact 75 - fuse 59 - terminal 52, and motor 57 rotates. and the blinds rise. The motor controller 58 has a built-in oscillation circuit, etc., and a pulse signal is generated from this oscillation circuit for an arbitrary period of time, and the motor controller 58
The slat is closed by intermittently rotating the motor 57 using a built-in triax or the like. When the slat is closed, the pulse signal becomes a continuous signal, and the motor 57 rotates continuously. That is, the slats are once closed, and then the blind is raised. When a stop switch (not shown) is operated, the lift switch 53 is opened and the power to the motor 57 is cut off.

When lowering the blind, the lowering switch 54 is closed. When the lowering switch 54 is closed,
From terminal 51 to lowering switch 54 - rising relay 61
Current flows through the path of normally closed contact 62 - drop relay 71 - lower limit switch 83 - one end of normally closed contact 74 - one end of normally open contact 75 - fuse 59 - terminal 52,
The lowering relay 71 operates and its normally closed contacts 72, 7
4 is opened, and normally open contacts 73 and 75 are closed. As a result, terminal 51 - normally open contact 73 -
A current flows through the path of motor 57 - normally open contact 75 - fuse 59 - terminal 52, and motor 57 rotates in the opposite direction to that when rising. At this time, no current flows through the motor controller 58, so the slat closes quickly and the blind immediately lowers.

[Problems to be solved by the invention] As shown in Fig. 4, conventional electric blinds
Rising relay 61, descending relay 71, ascending switch 53, descending switch 54, upper limit switch 81, 8
2. It is composed of a lower limit switch 83, an AC geared motor 57, a motor controller 58, etc., and since these switches and relays are controlled sequentially, there are the following drawbacks.

In other words, various relays and various switches are powered
It is connected to 100V, and it is necessary to use something that can electrically withstand this voltage, which makes the parts including wiring materials larger and more expensive. Furthermore, since it is a sequential control circuit, it is not possible to confirm the current vertical position of the blind.
For this reason, in order to return the blind to its original position after it has been raised, the operator must first confirm the original position, and then wait until the operator visually confirms that the blind has lowered to its original position. It is necessary to operate the stop switch.

For this reason, the rise switch 53, the fall switch 54, and the stop switch must each be configured as switches that are interlocked with each other. That is, when the up switch 53 is operated, the up switch 53 is locked and the contact is closed, but the down switch 54 is released and its contact is released, and when the stop switch is operated, the up switch 53 is released and the contact is closed. The lowering switch 54 remains open. When the lower switch 54 is operated, it is locked and the contact is closed, and when the stop switch or the raise switch 53 is operated, the contact of the lower switch 54 is released.

In addition, when adjusting the angle of the slats with conventional electric blinds, after the blind is raised and lowered, it is all closed, and after the blind is stopped at the desired position, the angle of the slats must be adjusted again. I have to readjust the angle.

Furthermore, a rise switch 53 and a fall switch 54
The slat angle adjustment switch and the slat angle adjustment switch are integrated, so even if you try to quickly raise or lower the blind, you must first close the slats using the method described below, and then raise or lower the blind. Therefore, the lifting and lowering operations will be delayed by that amount. Furthermore, if you try to adjust the slat angle and input the raising switch 53 or lowering switch 54 for too long, the blind itself will rise or fall, making it difficult to adjust the slat angle without taking your eyes off it until the desired angle is reached. If this is not possible and you reach the desired angle, you will need to operate the stop switch. In particular, when dozens of electric blinds are installed in one room, such as commercial blinds, it is extremely troublesome to operate them.

The lower limit switch is provided with a screw on the lifting shaft (not shown), and the switch is attached to a cam that engages with this screw.The cam moves left and right as the lifting shaft rotates, and the range of movement is adjusted to prevent blinds. However, this mechanism is complicated and expensive, and furthermore, it is difficult to set the lowering limit after the electric blind is installed, which poses a major obstacle in construction.

Also, if the blind hits an obstacle while descending and the descending movement is stopped,
It is necessary to stop the blind from lowering. For this reason, conventionally, when the blind is lowered, it tries to fall naturally due to the weight of the bottom rail, so it is necessary to rotate the motor to match this falling speed, but if the bottom rail hits an obstacle and stops descending, As the motor continues to rotate, the lift shaft also rotates, but when the bottom rail hits an obstacle and stops descending, the take-up drum attempts to stop, so this difference is mechanically detected and a switch is activated. The motor is stopped. For this reason, the detection mechanism becomes very complicated, the assembly and adjustment work is also complicated, and the cost increases.

Furthermore, when the lift switch 53 is operated, the motor controller 58 operates, for example, an oscillator circuit, and generates a pulse signal for the time necessary for the slat to close. Then, this pulse signal operates a triax inserted in the power supply circuit of the motor 57, and the motor 57
The slats were closed by rotating the motor intermittently, and after the slat closing time had elapsed based on experience, the pulse signal was changed to a continuous signal, the motor was rotated continuously, and the blind was raised. When lowering the blind by operating the lowering switch 54, the slats are instantly closed and the blind is lowered without using the motor controller 58. Naturally, it is not possible to adjust the angle of the blind slats by rotating them in the opposite direction to when they are raised.

As mentioned above, the conventional electric device shown in FIG. 4 has various problems.

Therefore, the main object of the present invention is to provide an electric blind that has a simple structure, simplifies assembly work, reduces the cost of each used part, and improves operability.

[Means for Solving the Problems] The present invention is an electric blind that raises and lowers a plurality of blades of the blind and adjusts the angle of the blades according to the rotation of a DC motor. A lifting means for raising and lowering the blind by winding or unwinding a strip member connected to a plurality of blades, a rotation detecting means for detecting rotation of a DC motor, and an angle detecting means for detecting an angle of the blades. , a failure detection means for detecting a failure such as a slackness of a band member, an upper limit position detection means for detecting that the blind has been raised and is at the upper limit position, and a lower limit position for detecting that the blind has been lowered and is at the lower limit position. a detection means, a command means for instructing the raising and lowering of the blind and opening and closing of the blades, and raising or lowering the blind by means of the raising and lowering means in response to the raising command or lowering command, and detecting the upper limit position or the lower limit position. The DC motor is stopped in response to a signal, the DC motor is stopped when an obstacle detection signal is output while the blind is going up or down, and the DC motor is stopped based on the blade angle detection output when a blade opening/closing command is given. control means for controlling the DC motor and adjusting the angle of the blades.

[Function] The electric blind according to the present invention uses a control means such as a microcomputer to control a DC motor based on a rise command, a descent command, an opening/closing command, and detection outputs of various detection means, and raises the blind. , descend, and open and close the blades.

[Embodiment of the Invention] FIG. 2 is a diagram showing an outline of an embodiment of the invention. First, the external configuration of an embodiment of the present invention will be described with reference to FIG. Power cord 1 and controller 2 are connected to control section 3 . The controller 2 includes a lift switch 21 for commanding the blind to rise, a stop switch 22 for commanding the blind to stop, a lowering switch 23 for commanding the blind to lower, and a lower switch 23 for commanding the opening of the slat 13. An open switch 24 and a close switch 25 are provided for providing a command to close the slat 13. The control section 3 has a built-in microcomputer, a power supply section, and the like, and is connected to a geared motor 4 composed of an electric motor and a reduction gear.

A rotating shaft of the geared motor 4 is connected to a lifting shaft 12 via a coupling 5. Lifting units 6, 7 and 8 are connected to the lifting shaft 12. Sensors, fault switches (not shown), and upper limit switches 16 built into these lifting units 6, 7, and 8 are connected to the control section 3 by wiring members 9. In addition, the wiring material 9
This also includes wiring to the geared motor 4 and wiring to the controller 2. Lifting units 6 and 8
includes a winding drum 37 and a ladder drum 39,
The lifting unit 7 includes only a rudder drum 39.
One end of a lifting tape (which may be in the form of a string) 10 is fixed to the winding drum 37.

The other end of the lifting tape 10 passes through a plurality of slats 13 and is fixed to a bottom rail 14. The winding drum 37 is connected to the lifting shaft 1.
As the lifting tape 2 rotates, the lifting tape 10 is wound up or rewound to raise and lower the slat 13 and the bottom rail 14. Also, rudder drum 3
One end of the ladder cord 11 is fixed to 9, and the other end of the ladder cord 11 is fixed to the bottom rail 14. The rudder drum 39 rotates with the rotation of the elevating shaft 12 to control the extent to which the slats are opened. The bottom rail 14 functions as a weight when lowering the blind and as a weight to prevent the blind from swinging due to wind after lowering.

The control section 3, geared motor 4, and lifting units 6, 7, and 8 are covered by a head box 15 constituting an outer box. An upper limit switch 16 is provided at the bottom of the head box 15, and when the blind is rolled up, the upper limit switch 16 is pressed by the slat 13 and operates to detect the upper limit position.

FIG. 3 is a schematic block diagram of one embodiment of the present invention. Next, referring to FIG. 3, the 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 steps down the input AC power, provides a low voltage to the stabilized power supply section 32, and creates the power necessary for the control section 3 and the geared motor 4. A motor drive circuit 33 is connected to a microcomputer (hereinafter referred to as MPU) 34, and the motor drive circuit 33 is connected to the MPU 3.
The geared motor 4 is controlled in normal rotation, reverse rotation, or brake mode in accordance with the command from 4.

Here, the brake mode means short-circuiting the input terminals of the geared motor 4 via the motor drive circuit 33. By short-circuiting the input terminals of the geared motor 4 in this way, the brake mode You can apply the brakes. In other words, when mechanical rotational force is applied to the geared motor 4 due to inertia due to the descent of the blind or when the blind is artificially pulled strongly in the downward direction, the geared motor 4 operates on the principle of a DC generator. A back electromotive force is generated. Therefore, by short-circuiting the input terminals, a current flows in a direction that prevents this rotation, that is, causes the geared motor 4 to rotate in the opposite direction, and the geared motor 4 stops. MPU3
A voltage detection circuit 35 is connected to 4. This voltage detection circuit 35 detects the voltage of the power supply Vcc supplied to the control section 3. That is, the voltage detection circuit 35 detects the voltage supplied from the power cord 1.
The low voltage side is monitored via the transformer 31.

The obstacle switch 36 is built into the lifting unit 6, and if the blind hits an obstacle while lowering and the lowering operation is stopped, the geared motor 4 continues rotating in the lowering direction. If the lifting tape 10 becomes loose and this continues, the lifting tape 10 will come off the winding drum 37, and even if you try to raise the blind next time, you will not be able to wind up the lifting tape 10, resulting in serious malfunction. will occur.

To prevent this, use lifting tape 1
0 loosening is detected by a mechanical switch or optical or magnetic sensor, and the detection output is
The signal is input to the MPU 34 and the geared motor 4 is stopped via the motor drive circuit 33. That is, the motor drive circuit 33 is set to the brake mode. Further, after the geared motor 4 is stopped, the MPU 34 reverses the rotation for an arbitrary period of time to wind up the blind, eliminates the loosening of the lifting tape 10, and then stops the geared motor 4.

The winding drum 37 winds or unwinds the lifting tape 10 as the geared motor 4 rotates, and raises and lowers the blind.
372 included. Further, for example, a slit 373 is formed around the guide 371. Note that a disc may be attached to another part of the lifting shaft 12 separately from the winding drum 37, and a slit may be formed in the disc, so that the rotation of the lifting shaft 12, the geared motor 4 or the motor of the geared motor 4 The same effect can be obtained by detecting the rotation of the shaft, so the mounting position and method are not critical.

A photo interrupter 38 is provided in conjunction with the guide 371 of the winding drum 37. This photo interrupter 38 is connected to the guide 3 of the winding drum 37.
The discontinuation of the slit 373 formed in the slit 71 is optically detected, and the rotation of the elevating shaft 12 is converted into an electrical signal and input to the MPU 34. That is,
The MPU 34 can know the amount of rise or fall of the lifting tape 10 due to the rotation of the winding drum 37 through an electric signal. Rudder drum 39
As mentioned above, one end of the ladder cord 11 is fixed to the ladder drum 39, and the angle of the slat 13 is changed by the rotation of the ladder drum 39, thereby changing the amount of incident outside light and adjusting the brightness of the room appropriately. , and block out external light.

The ladder drum 39 is fitted into the elevating shaft 12 via a drum shaft 40 penetrating therethrough with a frictional force. Lifting shaft 12 and drum shaft 4
0 rotate together (synchronously), but when the rudder drum 39 rotates approximately half a rotation, the rotation is stopped by a protrusion (not shown) provided on the head box 15, etc., and the rudder drum 39 slips with the drum shaft 40. Driving idle. Furthermore, when the elevating shaft 12 is reversed, the rudder drum 39 is also reversed in the same way, but it hits a protrusion such as the head box 15 and spins idly in the same manner as described above. As the rudder drum 39 rotates approximately half a turn, the slat 13 rotates clockwise and the angle of the slat 13 changes. That is, the slats 13 change from being tilted and closed on the indoor side to being horizontal and opened, and then changed to being tilted and closed on the outdoor side. When the lifting shaft 12 rotates in a direction opposite to that described above, the angle of the slat 13 changes counterclockwise. That is, it is opened from a tilted closed state on the outdoor side, horizontally opened, and then tilted and closed on the indoor side.

A slit 391 for detecting the rotation of the ladder drum 39 is formed at one end of the ladder drum 39. This slit 391 is formed at an angle corresponding to approximately half a rotation of the ladder drum 39, and a photo interrupter 41 is provided to detect the position of this slit 391. This photo interrupter 41 detects the position of the slit 391, converts it into an electrical signal, and supplies it to the MPU 34. The MPU 34 can determine the angle of the rudder drum 39, that is, the angle of the slat 13, in response to this electrical signal. The lower limit setting switch 42 sets the lowering position when the blind is lowered, and is composed of four switches. Note that the number of lower limit setting switches 42 is not limited to this number, but may be any number, and is determined depending on how finely the setting range of the lower limit position is set.

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. 1 is a flowchart for explaining the specific operation of an embodiment of the present invention.

Next, with reference to FIGS. 1 to 3, a specific operation of an embodiment of the present invention will be described.
After the electric blind is installed on a predetermined window frame, the lower limit position is set to an appropriate value by the lower limit setting switch 42. Then, when the power is turned on, the MPU
34 is initially reset. That is, the voltage detection circuit 35 detects the voltage of the stabilized power supply 32 and provides a voltage detection signal to the MPU 34 after a slight delay time. The MPU 34 resets and initializes external registers and the like in response to the voltage detection signal. Note that this initial setting is similarly performed by a reset switch (not shown). Next, the MPU
34 outputs a raising signal to the motor drive circuit 33 in order to raise the blind. In response, the motor drive circuit 33 rotates the geared motor 4. When the geared motor 4 rotates, the lifting shaft 12 rotates in a direction that raises the blind,
The lifting tape 10 is removed by the winding drum 37.
is wound up and the blind is raised.

In the MPU 34, the upper limit switch 16 is the slat 13.
The geared motor 4 continues to rotate until a signal indicating that the blind has reached the upper limit position is input. When the signal from the upper limit switch 16 is input, the MPU 34 gives a stop signal to the motor drive circuit 33. In response, the motor drive circuit 33 puts the geared motor 4 into brake mode to stop the blind. At this time,
MPU34 clears the built-in memory,
Set the upper limit position.

Next, when the lowering switch 23 of the controller 2 is operated to lower the blind,
The MPU 34 provides a drop signal to the motor drive circuit 33. In response, the motor drive circuit 33 rotates the geared motor 4 in the opposite direction to the direction used when ascending.
When the geared motor 4 rotates, the winding drum 37 rotates in the opposite direction, contrary to the above description, the lifting tape 10 wound around the winding drum 37 is rewound, and the blind is lowered. At this time, the MPU 34 reads pulse signals sent from the photo interrupter 38 provided in connection with the winding drum 37 and the photo interrupter 41 provided in connection with the ladder drum 39, and starts counting.
MPU34 is photo interrupter 38 and 41
After a certain period of time, it is determined whether a pulse signal has been input. This is a case where the geared motor 4 is locked if the pulse signal is not input within a predetermined period of time, or some other trouble occurs and the geared motor 4 is not rotating, and this abnormality can be determined. When this occurs, an alarm signal is output and a notification device (not shown) is driven to notify the abnormality. At the same time, the MPU 34 sends a stop signal to the motor drive circuit 33 to put the geared motor 4 in brake mode.

Similarly, the MPU 34 determines whether the pulse widths of the pulse signals provided from the photo interrupters 38 and 41 match a preset value. If the width of the pulse signal does not match the predetermined value, an alarm signal is output and abnormality notification is performed in the same manner as described above.
The MPU 34 is the stop switch 22 of the controller 2.
is operated to determine whether a stop command has been given. If a stop command is given from the stop switch 22, the MPU 34 controls the motor drive circuit 3.
A stop signal is sent to motor 3, and geared motor 4 is temporarily put into brake mode. And MPU34
determines whether there is a command from the open switch 24 or the close switch 25 of the controller 2, and if there is no command to open or close, the geared motor 4 is rotated intermittently. That is, the MPU 34 rotates the geared motor 4 alternately between rotation and brake mode, and while counting pulse signals given from the photo interrupter 41, moves the geared motor 4 until the slat 13 becomes horizontal.
The geared motor 4 is rotated intermittently and the program proceeds to the main routine for raising or lowering the blind.

The MPU 34 determines whether a signal is given from the open switch 24 or the close switch 25 for adjusting the angle of the slat 13, and switches the open switch 24.
If there is an input signal from the close switch 25, the geared motor 4 will be intermittently rotated in the forward direction while counting pulse signals from the photo interrupter 41, and if there is an input signal from the close switch 25, the geared motor 4 will be intermittently rotated in the reverse direction. let Then, if the input signal from the open switch 24 or the close switch 25 disappears,
The geared motor 4 is put into brake mode to stop the opening and closing of the slat 13.

When the lowering of the blind is blocked by an obstacle or the like and the lifting tape 10 loosens, and the obstacle switch 36 detects this, the MPU 34 outputs an alarm signal in response to the detection signal from the obstacle switch 36 to detect the abnormality. At the same time, the geared motor 4 is stopped. If the blinds are stopped due to these problems, after removing the obstruction,
Return to initial settings. In the operation of lowering the blind, if the value set by the upper limit setting switch 42 and the count value of the pulse signal given from the photo interrupter 38 match, the MPU 34 determines that the blind has reached the lower lower limit position. , the geared motor 4 is stopped to stop the blind from lowering. After this, the MPU 34 rotates the geared motor 4 intermittently, closes the slat 13, and proceeds to the main routine for raising or lowering the blind.

In this way, when the blind is lowered after the initial setting and the blind is lowered to the lowest position, the slats 13 are in the closed state, and when the blind is stopped in the middle of lowering, the open switch 24 or the close switch 25 is activated. The slat 13 will be horizontal unless commanded by .

In addition, when raising the blind, by operating the raising switch 21 of the controller 2, the operation opposite to the case of lowering is performed.

[Effects of the Invention] As described above, according to the present invention, the DC motor is driven by the control means in response to the raising, lowering, and blade opening/closing commands and the detection signals from various detection means to raise and lower the blind, Since the blades are opened and closed, it is possible to reduce the size of the component parts, reduce assembly man-hours, lower the price, and improve operability.

[Brief explanation of drawings]

FIG. 1 is a flowchart for explaining the specific operation of an embodiment of the present invention. FIG. 2 is a diagram showing an outline of an embodiment of the present invention. FIG. 3 is a schematic block diagram of one embodiment of the present invention. Fourth
The figure is an electrical circuit diagram of a conventional electric blind. In the figure, 2 is a controller, 3 is a control unit,
4 is a geared motor, 6, 7, 8 are lifting units, 10 is a lifting tape, 11 is a ladder cord, 12 is a lifting shaft, 13 is a slat, 1
4 is a bottom rail, 16 is an upper limit switch, 21 is a raise switch, 22 is a stop switch, 23 is a lower switch, 24 is an open switch, 25 is a close switch, 33 is a motor drive circuit, 34 is an MPU, 36
is the fault switch, 37 is the winding drum, 38, 41
is photo interrupter, 39 is rudder drum, 4
2 indicates a lower limit switch.

Claims (1)

[Scope of Claims] 1. An electric blind that raises and lowers a plurality of blades of the blind and adjusts the angle of the blades according to the rotation of a DC motor, the electric blind that moves the plurality of blades according to the rotation of the DC motor. Lifting means for raising and lowering the blind by winding or unwinding the connected strip members; Rotation detecting means for detecting the rotation of the DC motor; Angle detecting means for detecting the angle of the blade; The strip member. upper limit position detection means for detecting that the blind has been raised and is at the upper limit position; lower limit position detection means for detecting that the blind has been lowered and is at the upper limit position; a command means for instructing the raising and lowering of the blind and opening and closing of the blade; and a command means for raising or lowering the blind by the raising and lowering means in response to a raising command or a lowering command from the command means, and raising or lowering the blind by the raising and lowering means, The DC motor is stopped in response to a detection signal from the position detection means or the lower limit position detection means, and when a detection signal is output from the failure detection means while the blind is being raised or lowered, the DC motor is stopped and the command is An electric blind comprising control means for controlling the DC motor based on a detection output of the angle detection means and adjusting the angle of the blade in response to a command to open and close the blade from the means.