JPH0470477B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an electric blind device, and in particular,
This invention relates to an improvement in an electric blind device that raises and lowers a blind using a motor.

[Prior Art] Recently, electric blind devices in which a blind is raised and lowered by a motor have been put into practical use. In such an electric blind device, the rotation speed of the motor is controlled by a microcomputer in order to raise and lower the slats (blades) at a constant speed. Further, in such an electric blind device, in order to stop the slat at a predetermined lower limit position, it is necessary to store the stopping position in a memory built into the microcomputer.

[Problem to be solved by the invention] However, if a power outage occurs while the slats are rising or falling, the data indicating the slat position stored in the memory will be lost, and the slats will not function normally even after the power is restored. It stops working. Conventionally, in order to avoid this situation, a backup battery was provided to protect the memory contents from being erased due to a power outage or other reasons; There were problems such as the space required for storage and the time and effort it took to replace batteries.

SUMMARY OF THE INVENTION Therefore, it is a primary object of the present invention to provide a power blind device in which all slats are raised when power is restored after a power outage.

[Means for Solving the Problems] The present invention includes a rotation detection sensor for detecting the rotation of a rotation shaft that rotates according to the rotation of a motor and that raises and lowers the slat, and according to the detection output of the rotation detection sensor, An electric blind device that controls the rotation of a motor to raise and lower the slats, comprising a storage means for storing the current position of the slats, and a raising command signal output means for outputting a raising command signal for commanding the raising of the slats. , an upper limit detection means for detecting that the slat has reached the upper limit position, and only when the upper limit detection means detects that the slat has not reached the upper limit position and a rising command signal is given when the power is turned on; The control means rotates the motor to raise the slat, and when it is detected that the slat has reached the upper limit position, the control means initializes the contents stored in the storage means.

[Function] The electric blind device according to the present invention rotates the motor to raise the slats only when it is detected that the slats have not reached the upper position when the power is turned on and a command to raise the slats is given. When it is detected that the upper limit position has been reached, the stored contents of the storage means are initialized, so there is no need to provide a backup battery or the like to protect the memory contents from being erased due to a power outage.

[Embodiment of the Invention] FIG. 2 is a diagram showing an outline of an embodiment of the invention. In FIG. 2, a DC motor 11 is driven by a motor drive circuit 12. In FIG. DC motor 1
1 has a magnetic disk 14 and a winding drum 16 on the rotating shaft.
and 17 are connected. Magnetic poles S and N are formed around the magnetic disk 14, and a rotation detection sensor 15 is attached to face the magnetic disk 14. The rotation detection sensor 15 outputs a pulse signal corresponding to the number of rotations of the magnetic disk 14 that rotates as the DC motor 11 rotates. The winding drums 16 and 17 are connected to the bottom rail 3
This is to wind up the tapes 18 and 19 connected to each other. Therefore, as the DC motor 11 rotates, each slat (blade) 20 rises. Further, an upper limit switch 21 is provided to detect when the slat 20 has been hoisted up to the upper limit position.

FIG. 3 is a schematic block diagram showing the electrical configuration 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. Motor drive circuit 1 shown in FIG. 2 above
2, the rotation detection sensor 15, and the upper limit switch 21 are connected to a microcomputer (hereinafter referred to as MPU) 22. As the rotation detection sensor 15, a reed switch or the like is used that closes its contact as the magnetic disk 14 rotates. moreover,
A rise switch 25, a stop switch 26, a fall switch 27 are connected to the MPU 22, and an oscillation circuit 23 is also connected thereto. The oscillation circuit 23
By adjusting the variable resistor 24 for changing the CR time constant, CR pulses with different oscillation frequencies are generated. In addition, MPU2
2 is supplied with power from a power supply circuit 28.

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.
When the down switch 27 is operated, the MPU 22 reverses the storage motor 11 via the motor drive circuit 12. When the DC motor 11 reverses, the tapes 18 and 19 are lowered by the winding drums 16 and 17, and the slat 20 begins to descend accordingly. At this time, as the DC motor 11 rotates, the magnetic disk 14 also rotates, and the rotation detection sensor 15 repeatedly turns on and off, giving a pulse signal to the MPU 22. The MPU 22 controls the motor drive circuit 12 based on the pulse signal from the rotation detection sensor 15 so that the rotation of the DC motor 11 is constant.

At the same time, the MPU 22 counts pulse signals from the rotation detection sensor 15. The count value is MPU2
2 is stored in a memory (not shown) included in 2.
Therefore, by determining the count value stored in this memory, the position of the slat 20 can be known. In this case, the coefficients for the position of the slat 20 are started with an upper limit of 0. If it is desired to stop the slat at a certain distance below the upper limit, the variable resistor 24 is rotated to determine that position. That is, the oscillation circuit 23 is connected to the variable resistor 24
When the resistance value is varied, the oscillation frequency changes, and the lower limit stop position of the slat 20 can be determined.

In such a state, if the power is cut off, the count value corresponding to the current position of the slat 20 stored in the memory of the MPU 22 will be erased, and the vertical position of the slat 20 will become unknown. Therefore, in the present invention, only the lift switch 25 can be operated when the power is turned on. When the rise switch 25 is operated, the MPU
22, the motor drive circuit 12 is controlled to rotate the DC motor 11 in the forward direction. This causes the slat 20 to rise. When the slat 20 rises to the upper limit, the upper limit switch 21 is turned on, and by operating this upper limit switch 21,
The MPU 22 determines that the slat 20 has risen to the upper limit position. Then, the MPU 22 clears the memory. That is, when the power is turned off and then turned on again, the slat 20 will rise to the upper limit position by operating the lift switch 25, and at that time the contents of the memory will be cleared, returning it to its initial state. be able to. Then, when the lower switch 27 is operated, the DC motor 11 is reversed and the slat 20 starts lowering. In addition,
In the above description, the present invention is applied to control of the DC motor 11, but the present invention is not limited to this, and similar effects can be obtained even when applied to control of a geared motor or an AC motor.

[Effects of the Invention] As described above, according to the present invention, the motor is operated to raise the slat only when the power is turned on and the slat has not reached the upper limit position and a raising command is given. In addition to controlling the slat, when the slat reaches its upper limit position, the memory contents of the storage means that memorize the current position of the slat are initialized, so unlike conventional computer ICs, a battery for backing up the memory is not required. There is no need to provide it, and it can always be returned to the initial state.

[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. In the figure, 11 is a DC motor, 12 is a motor drive circuit, 14 is a magnetic disk, 15 is a rotation detection sensor, 16, 17 are winding drums, 18, 19 are tapes, 20 is a slat, 21 is an upper limit switch, 22 23 is an oscillation circuit, 24 is a variable resistor, 25 is an up switch, 26 is a stop switch, and 27 is a down switch.

Claims (1)

[Scope of Claims] 1. A rotation detection sensor for detecting the rotation of a rotation shaft that rotates in accordance with the rotation of the motor and that raises and lowers the slat, and detects the rotation of the motor based on the detection output of the rotation detection sensor. in an electric blind device for raising and lowering the slat by controlling the slat, the storage means storing the current position of the slat in relation to the output of the rotation detection sensor, and outputting a raising command signal for commanding the raising of the slat. an upper limit detection means for detecting that the slat has reached the upper limit position; and when the power is turned on, the upper limit detection means detects that the slat has not reached the upper limit position, and the upper limit detection means detects that the slat has not reached the upper limit position. The motor is rotated to raise the slat only when a raising command signal is given from the command signal output means, and when the upper limit detection means detects that the slat has reached the upper limit position, An electric blind device comprising a control means for initializing the storage contents of the storage means.