JP2001218498A - Powered blind - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powered blind which can be stopped instantaneously when a limit switch operates. SOLUTION: Limit switches 22, 23, and 24, which detect a blind going up or down to a specified position, are connected to the power line between the motor 16 inside the blind 12 and a power source, and also short-circuiting lines, which short-circuit both terminals 16a and 16b of the motor 16 through diodes 28, 29, and 30 when the limit switches 22, 23, and 24 operate, are wired.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blind.

[0002]

2. Description of the Related Art As a conventional electric blind, as shown in FIG. 3, a DC motor 42 provided in a blind body is used.
A power supply for supplying power to the DC motor 42, and a control unit 46 including a switch, a relay circuit, and the like capable of controlling the rotation of the DC motor 42, and a power supply line between the DC motor 42 and the power supply. To which an upper limit switch 48, 49 and a lower limit switch 50 are connected. Diodes 51, 52 and 53 are connected in parallel to the limit switches 48, 49 and 50, respectively. The switch of the control unit 46 is switched by an ascending or descending command from an operation unit (not shown), and the DC motor 42 rotates forward or backward to perform the ascent and descent of the blind. The circuit is activated,
The blind is instantaneously stopped by short-circuiting both terminals of the DC motor 42 in the blind body.

Also, limit switches 48, 49, 50
If either of the above operates, the connection of the power supply line is cut off, and the DC motor 42 is disconnected from the power supply.

[0004]

However, merely disconnecting the connection between the DC motor 42 and the power supply causes a problem that the blinds rotate by inertia before the stop and the stop positions of the blinds vary.

The present invention has been made in view of the above problems, and has as its object to provide an electric blind capable of instantaneously stopping the blind when a limit switch is operated.

[0006]

According to one aspect of the present invention, a motor provided in a blind main body, a power supply for supplying power to the motor, A control unit capable of controlling the rotation of the motor,
In an electric blind that raises and lowers a blind by the driving force of a motor, a limit switch that detects that the blind has moved up and down to a predetermined position is connected to a power supply line that connects between a motor and a power supply in the blind body, and a limit switch is provided. When the switch is operated, a short-circuit line for short-circuiting both terminals of the motor via the diode is provided. When the limit switch is activated, both terminals of the motor are short-circuited, so that the motor stops suddenly and the blind stops instantly. Therefore, it is possible to prevent variation in the stop position.

According to a second aspect of the present invention, the diode according to the first aspect has a motor rotation state corresponding to one of a rising state and a falling state of a blind in which the limit switch is to be operated. It is characterized by being connected so as to be in the opposite direction to the current flow in the opposite rotation state. After the limit switch has been actuated and the blind has stopped, the current can be made to flow to the motor, rather than to the diode, when the current flow is reversed, in order to operate the blind in reverse.

[0008] The invention described in claim 3 is claim 1 or 2.
In parallel with the limit switch described above, the current flow in the rotation state opposite to the rotation state of the motor corresponding to one of the up state and the down state of the blind in which the limit switch is to operate is described. The second diode is connected so as to be in the direction. After the limit switch has been actuated and the blind has stopped, current flows through the second diode when current flow is reversed to reverse the operation of the blind.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an embodiment of an electric blind according to the present invention, and FIG. 2 is a circuit diagram of a main part thereof.

Referring to FIG. 1, an electric blind 10 includes a blind body 12 having a shield 14 and a head box 15, and further includes a DC motor 16 and a DC motor 1 in a head box 15 of the blind body 12.
A power supply unit 18 for supplying power to the DC motor 6 and a control unit 20 including a switch capable of controlling the rotation of the DC motor 16 are provided. An AC current from an external power supply is supplied to the power supply unit 18, converted into a DC current by the power supply unit 18, and a DC current from the power supply unit 18 is supplied to the DC motor 16 via the control unit 20 when necessary. It has become. An upper limit switch 22, 23 and a lower limit switch 24 are connected in series to a power supply line connecting one terminal 16a of the DC motor 16 and a power supply. , A diode (second diode) 2
5, 26 and 27 are respectively connected. The upper limit switches 22 and 23 are provided on the right and left sides of the head box 15 so as to protrude toward the shield 14 (see FIG. 1), and the shield 14 reaches the respective positions. When this is detected, the contact is switched from the normally closed contact to the normally open contact. Similarly, the lower limit switch 24 is connected to the headbox 1
The contact is switched from a normally closed contact to a normally open contact when it detects that the shield 14 has reached the lower limit position based on the rotation amount of the DC motor 16. Diodes 25 and 26 operate in a state opposite to the rising state of shield 14 at which upper limit switches 22 and 23 should operate, that is, when the DC motor 16 is rotated so as to lower shield 14, the current flows. And are connected in the forward direction. On the other hand, the diode 27
Is the shield 1 on which the lower limit switch 27 is to operate.
4 is connected in a direction opposite to the descending state, that is, in the forward direction with respect to the flow of current when the DC motor 16 is rotated to raise the shield 14.

Each of the limit switches 22, 23, 2
4 have normally open contacts 28, 29, 30
Of the diodes 28, 29, 3
0 is connected to the other terminal 16b of the DC motor 16. The diodes 28 and 29 are in a state opposite to the rising state of the shield 14 in which the connected limit switches 22 and 23 are to be operated, that is, the current flow when the DC motor 16 is rotated to lower the shield 14. Are connected in the opposite direction. On the other hand, the diode 30 is in a state opposite to the lower state of the shield 14 in which the connected limit switch 24 is to be operated, that is, the shield 1
4 are connected so as to be in the opposite direction to the current flow when the DC motor 16 is rotated so as to raise the DC motor 4.

These limit switches 22, 23, 2
4 and diodes 25, 26, 27, 28, 29, 30
Are housed in the head box 15 of the blind main body 12.

A reception antenna 32 is connected to the control section 20. The reception antenna 32 can receive a command signal from an operation section 34 which is a remote control different from the blind main body 12. I have. However, it is a matter of course that the command signal from the operation unit may be sent to the blind main body 12 by wire instead of the wireless method as in this embodiment.

The operation of the electric blind constructed as described above will be described.

When an ascending command is issued from the operation unit 34, an UP switch (not shown) in the control unit 20 is turned on, and the current supplied from the power supply unit 18 passes through the control unit 20, and the limit switches 24, 23, 22, Terminal 16a,
The DC motor 16 flows through the DC motor 16, the terminal 16 b, and the control unit 20 to the power supply unit 18, and the DC motor 16 rotates in a predetermined direction (forward rotation). If the shield 14 continues to rise without a stop command being issued from the operation unit 34, the shield 14
Reaches the upper limit, and one of the upper limit switches 22 and 23, for example, the limit switch 22 is operated.
Then, the contact of the limit switch 22 is switched to the normally open contact, the terminals 16a and 16b of the DC motor 16 are short-circuited via the diode 28, and the DC motor 16 stops suddenly.

Next, when a lowering command is issued from the operation unit 34, a DOWN switch (not shown) in the control unit 20 is turned on.
The current supplied from the power supply unit 18 passes through the control unit 20, and the terminal 16b, the DC motor 16,
a, the current flows through the diode 25, the limit switches 23 and 24, and the control unit 20 to the power supply unit 18, and the DC motor 16 rotates in the reverse direction. At this time, since the voltage on the cathode side of the diode 28 is high, the diode 28
No current flows from When the lowering operation is further continued, the upper limit switch 22 returns to the original state, and the contact is switched to the normally closed contact.

The above operation is achieved by the upper limit switch 23.
The same is true when operates.

If the shield 14 continues to descend without a stop command being issued from the operation unit 34, the shield 14 reaches the lower limit, and the lower limit switch 24 is operated this time. Then, the terminals 16a and 16b of the DC motor 16 are short-circuited via the diode 30, and the DC motor 16 stops suddenly. Next, when the ascending command is issued from the operation unit 34 and the DC motor 16 rotates forward, the diode 3
Since the voltage on the cathode side of 0 is high, the current from the control unit 20 does not flow through the diode 30 and the limit switch 24 returns to the original state when the rising operation is continued.

When a stop command is issued from the operation unit 34, the relay circuit in the control unit 20 is activated to operate the DC motor 1
6, the DC motor 16 is suddenly stopped by short-circuiting the terminal 16a and the terminal 16b. In this embodiment, not only when a stop command is issued, but also when the limit switch 22,
When the motors 23 and 24 operate, the DC motor 16 stops suddenly, and the shield 14 stops almost simultaneously with the operation of the limit switch. Therefore, it is possible to prevent the stop position of the shield 14 from varying.

In the above configuration, the number of diodes and the number of wires are increased by the number of limit switches as compared with the conventional configuration, and further, no change is required in the control section. can do.

[0021]

As described above, according to the present invention,
Since the blind can be stopped instantaneously with the operation of the limit switch, it is possible to prevent the stop position of the blind from varying.

[Brief description of the drawings]

FIG. 1 is an overall front view of an electric blind of the present invention.

FIG. 2 is a circuit diagram illustrating an electric blind according to an embodiment of the present invention.

FIG. 3 is a circuit diagram of a conventional electric blind.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electric blind 12 Blind main body 16 Motor 18 Power supply unit 20 Control part 22,23,24 Limit switch 25,26,27 Diode (second diode) 28,29,30 Diode

Claims (3)

[Claims] 1. A motor (16) provided in a blind body (12), a power supply for supplying power to the motor (16), and a control unit (2) capable of controlling rotation of the motor (16).
0), and the blind is moved up and down by the driving force of a motor (16). A blind is provided on a power supply line connecting the motor (16) in the blind body (12) and a power supply. Limit switch (22, 2)
3, 24) and limit switches (2
When the diode (28,23,24) is activated,
29, 30), both terminals (16) of the motor (16).
An electric blind characterized by wiring a short-circuit line for short-circuiting a, 16b). 2. The diode (28, 29, 30).
Is applied to the current flow in the rotation state opposite to the rotation state of the motor (16) corresponding to one of the up state and the down state of the blind in which the limit switch (22, 23, 24) is to operate. The electric blind according to claim 1, wherein the electric blind is connected in a direction opposite to the electric blind. 3. The limit switch (22, 23, 2).
In parallel with 4), the limit switches 22, 23, 2
4) The second direction is set so as to be forward with respect to the current flow in the rotation state opposite to the rotation state of the motor (16) corresponding to one of the up state and the down state of the blind to be operated. Diodes (25, 26, 27)
The electric blind according to claim 1, wherein the electric blind is connected.