JPH06248859A - Opening and shutting position display of motor-driven opening and shutting member - Google Patents

Abstract

PURPOSE:To display the prior state of conditions after the electrical supply has stopped. CONSTITUTION:A device displays the opening and shutting positions of a shutter which is provided with a switch Lm1 which detects the fully open state and a switch Lm2 which detects the fully closed state of the shutter, and includes an electrical current detection circuit 1 and a logic circuit 2. The circuit 1 is provided with a switch Lm2-2 which is connected with a commercial electric source AC, a coil L and a photocoupler PC, and the coupler PC is connected with the electric source AC. When the switch Lm2-2 is not actuated in the circuit 1, a signal 'H'. The circuit 2 is provided with NORs 1 and 2, displays D1 and D2, and an output of the circuit 1 is delivered to NOR 1, and an output of the NOR 1 is delivered to NOR 2, and is connected to a transistor T1. A signal I is delivery to NOR 2 and NOR 1, and an output of the NOR 2 is delivery to a transistor T2. The signal I becomes 'H' only at the time of operation of a motor M. The output of the circuit 1 and the signal I are delivery to the circuit 2, and the display D2 is lit when the switch Lm1 is not actuated and the shutter is half-closed, and when the switch Lm2 is actuated, the display D1 is lit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for displaying the opening / closing position of an electric opening / closing member such as a shutter or a blind.

[0002]

2. Description of the Related Art As is well known, in shutters installed at entrances and exits of building structures and blinds installed in windows,
There is provided a structure in which these are moved up and down by rotational driving of a motor to open and close an entrance and an exit or a window. In such an electrically operated opening / closing member, normally, an upper limit switch for detecting the fully open state in which the opening / closing member is raised to the maximum raised position,
A lower limit switch for detecting a fully closed state in which the opening / closing member is lowered to the lowest position is provided, and the rotational drive of the motor is controlled by detection signals from the upper and lower limit switches.

Further, when such an electric opening / closing member is used, the opening / closing position of the opening / closing member is often indicated by an indicator such as a lamp for safety reasons.
However, the conventional device for displaying the open / closed position of the open / close member as described above has been pointed out to have the technical problems described below.

[0004]

That is, in the device for displaying the opening / closing position of the opening / closing member described above, for example,
Up. Although the operation signal of the lower limit switch is used as a control signal to drive the relay etc. to operate the display,
In the display device having such a configuration, for example, when power supply is stopped due to a power failure, the state of the relay changes, and when power supply is restored, the state before the power failure cannot be reproduced.

To solve such a problem, for example, if a non-volatile memory circuit stores the stopped state, it can be easily reproduced. However, such a solution means a complicated circuit configuration. Moreover, it is costly. The present invention has been made in view of the above conventional problems, and an object of the present invention is to reproduce a stopped state before a power failure even when power supply is stopped by a relatively simple configuration. It is an object of the present invention to provide an open / close position display device for an electrically operated open / close member.

[0006]

In order to achieve the above object, the present invention provides a device for displaying the open / closed position of an open / close member such as a shutter or a blind which is vertically moved by rotational driving of the motor. A changeover switch for selecting reverse rotation, a pair of indicators for displaying the open / closed position of the open / close member, an upper limit switch for detecting the fully open position of the open / close member, and a lower limit switch for detecting the fully closed position of the open / close member. And a current detection circuit which is interposed in the drive circuit of the motor and which outputs a high level signal when the lower limit switch is not operated, an output signal of the current detection circuit and a drive / stop signal of the motor As one of the indicators is turned on when the upper limit switch is activated and when the shutter is stopped at the intermediate position, And having a logic circuit for lighting the other indicator during operation of Ttosuitchi.

[0007]

According to the opening / closing position display device for the electric type opening / closing member having the above-described structure, the current detection circuit which is interposed in the drive circuit of the motor and which sends out a high level signal when the lower limit switch is inactive, and this current detection circuit Input the circuit output signal and the motor drive / stop signal to light one indicator when the upper limit switch is activated and when the shutter stops at the intermediate position, and the other indicator when the lower limit switch is activated. Since it has a logic circuit that lights up, even if the power supply is stopped, if this is restored, for example, when the opening / closing member is at the fully open position, one of the indicators is lit and the fully closed position is provided. In some cases, the other indicator lights up.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 1 and 2 show an embodiment of an open / close position display device for an electric open / close member according to the present invention. FIG. 1 is a circuit diagram showing an overall configuration including a drive system for opening and closing a shutter as an opening / closing member,
The shutter (not shown) is moved up and down by the forward and reverse driving of the AC motor M, and the upper limit switch Lm ₁ for detecting the fully open state where the shutter is raised to the highest position and the fully closed state where the shutter is lowered to the lowest position. A lower limit switch Lm ₂ for detecting the state is provided at a position close to the shutter.

The lower limit switch Lm ₂ used in this embodiment has two normally closed contacts Lm _2-1, Lm _2-2 . The motor M has a winding m ₁ for forward rotation and a winding m ₂ for reverse rotation, and these windings m _1, m ₂
A capacitor C ₁ is provided between them. Winding m _1, m
One end side of ₂ is commonly connected and is connected to one end side of the commercial power supply AC.

[0010] the other end of the winding m ₁ is the upper limit switch Lm ₁ having contacts normally closed are connected in series, the other end of the upper limit switch Lm ₁ is forward rotation terminal A of the motor M, reverse The switch B is connected to the non-inverted terminal A of the changeover switch SW capable of selecting the terminal B and the stop terminal C.
Is connected to the other end of the commercial power supply AC via a fuse F.

[0011] the other end of the winding m _2, the upper limit limit switch Lm _2-1 having contacts normally closed are connected in series, the other end of the upper limit switch Lm _2-1 is reversed terminals of the motor M Connected to B. The open / close position display device includes a current detection circuit 1 and a logic circuit 2 in addition to the above configuration. The current detection circuit 1 includes a lower limit switch Lm _2-2 whose one end is connected to the commercial power supply AC, a coil L whose one end is connected to this switch Lm _2-2 , and a photocoupler PC which is connected in series to the coil L. It has a diode side and a protection resistor R ₁ connected in parallel with this diode, and the other end side of the photocoupler PC is connected to the commercial power source AC side.

In the phototransistor of the photocoupler PC, the collector is connected to the DC power supply V, and the emitter side has an electric field capacitor C ₂ and a resistor R ₂ whose one end is grounded.
₂ and are connected in parallel. In the current detection circuit 1 thus configured, a high level signal is sent to the outside when the lower limit switch Lm _2-2 is inoperative. Logic circuit 2 includes two N0R1,2, and two indicator D _1, D ₂ which is composed of LED, and a display unit D _1, the driver transistor T ₁ of the D _2, T ₂ Prefecture There is. N0R1
The output side of the current detection circuit 1 is connected to one of the input terminals, the output terminal of the NOR1 is connected to one input terminal of the N0R2, and the driver transistor T ₁
Connected to the base of.

The other input terminal of NOR2 is connected to the input terminal of NOR1.
Commonly connected to the remaining input terminals, and these terminals are
The number I is input. The output terminal of NOR2 is
Iber transistor T₂Has been entered in the base of. Do
Liver transistor T_1,T ₂The collectors of each
Connected to the DC power supply V, each emitter has a
Indicator D_1,D₂Are connected. Display D_1,D₂Has
Each protection resistance R_3,R_FourAre connected in parallel.

The signal I input to the NORs 1 and 2 is the output signal of the rotation sensor attached to the motor M,
When the motor M is rotating, a high level signal H
Is input and the motor M is stopped, the low-level signal L is input. The logic circuit 2 configured as described above receives the output signal of the current detection circuit 1 and the drive / stop signal I of the motor M as _one input, and operates when the upper limit switch Lm ₁ is actuated or when the shutter is stopped at an intermediate position. The indicator D ₂ (red display) of
When the lower limit switch Lm _{2 is} activated, the other indicator D ₁
Turn on (green display).

Next, the operation of the display device having the above structure will be described with reference to FIG. In FIG. 2, the open / closed state of the shutter is shown on the upper side, and the states of the indicators D _{1 and} D ₂ that blink according to the open / closed state of the shutter are shown on the lower side. First, with the shutter fully open, the upper limit switch Lm ₁ is operating. Therefore, when the commercial power supply AC is turned on in this state, the changeover switch SW turns the forward rotation terminal A
Since the motor M is not driven even if the signal I
Becomes "L".

On the other hand, in the current detection circuit 1, since the lower limit switch Lm _2-2 is not operating, the photo coupler P
C becomes the operating state, and as a result, the "H" signal is supplied from the current detection circuit 1 to one terminal of the NOR1 circuit. Therefore, the output of NOR1 is, "L" becomes green indicator D ₁ does not emit light. On the other hand, the input signal of the NOR2, the signal I is "L", the output signal of the NOR1 becomes "L", the output signal becomes "H", thereby red indicator D ₂ is turned on.

Next, when the changeover switch SW is set to the reverse rotation terminal B side and the motor M is reversely driven to lower the shutter, the upper limit switch Lm ₁ is deactivated and the signal I becomes "H". . On the other hand, during the lowering of the shutter, the lower limit switch Lm _2-2 has not been activated yet, so the photocoupler PC is activated, and as a result, one terminal of NOR 1 receives the current from the current detection circuit 1.
H "signal is supplied. Therefore, the output of NOR1 is" L "next green indicator D ₁ does not emit light. On the other hand, the input signal of the NOR2, the signal I is" H ", NOR1
Output signal is "L", the output signal is "L"
As a result, the red display D ₂ also does not light up.

When the changeover switch SW is connected to the stop terminal C and the motor M is stopped while the shutter is descending, the signal I becomes "L", but even in this state, the current detection circuit 1 outputs "H". "since the signal is supplied to the N0R1, the output of NOR1 is" becomes L ", the green indicator D ₁ does not emit light. However, the signal I becomes "L", the input signal of the NOR2 is both "L", the red indicator D ₂ is turned on.

When the shutter reaches the fully closed position by continuing the downward movement of the shutter, the lower limit switch Lm ₂
Is activated and the motor M is stopped. In this state, no current is supplied to the photocoupler PC in the current detection circuit 1, so
The output signal becomes "L" and the signal I also becomes "L".
become. Therefore, the output of the NOR1 becomes "H", the thereby the green indicator D ₁ is turned on. On the other hand, since the input signal of the NOR circuit 2 becomes "H" and "L", the red indicator D ₂ does not emit light.

Changeover switch SW from the fully closed state of the shutter
Operate to raise this and lower limit switch.
Ji Lm₂Becomes inactive, which causes the current detection circuit 1 to
The output signal becomes "H" and the signal I becomes "H".
It Therefore, the display D_1,D ₂Is the shutter described above.
As in the case of lowering, neither lights up. Also, this
If the motor M is stopped during the ascent of the
Red display D₂Only lights
When the shutter reaches the fully open position, the red indicator D
₂Will light up.

In the display device configured as described above, for example, when power supply is stopped at the fully open position of the shutter, when power supply is restored, as described at the beginning of the operation of this device, the red light is emitted. The display D ₂ lights up and the state before the power supply is stopped is displayed. When the power supply is stopped while the shutter is being lowered or raised and the power supply is restored, the motor M rotates forward and backward simultaneously with the restoration of the power supply. In this state, the lower limit switch Lm ₂ is inoperative, The output of the current detection circuit 1 becomes "H", the signal I becomes "H", and N
The output of the OR1 becomes "L", the green indicator D ₁ may together become non-lighting, the input of the NOR circuit 2 is "L" and "
H ”, the red indicator D ₂ also goes off,
The status before power supply is stopped is displayed.

The following is the case where the device is designed so as not to operate for security reasons even if the power supply is stopped in the above-mentioned state and the power supply is restored. Since the lower limit switch Lm ₂ is not activated, the output of the current detection circuit 1 becomes “H”, the signal I becomes “L”, and N
OR1 or output becomes "L", both the green indicator D ₁ becomes non-lighting, since the output signal I of a is NOR1 input NOR2 respectively become "L", the red indicator D ₂ lights up and the status before the power supply is stopped is displayed.

Further, when the power supply is stopped while the movement of the shutter is stopped in the middle of raising and lowering, when the power supply is restored, the motor M is stopped even when the power supply is restored. In this state, , The lower limit switch Lm ₂ is inactive, the output of the current detection circuit 1 is “H”, the signal I
There becomes "L", the output becomes "L" of the NOR1, green indicator D ₁ may together become non-lighting, since the input of NOR2 becomes "L" and "L", a red indicator D ₂ The light turns on and the state before the power supply is stopped is displayed.

Further, when the power supply is stopped when the shutter is fully closed and the power supply is restored, the motor M is stopped even when the power supply is restored. In this state, the lower limit switch Lm ₂ is activated. Current detection circuit 1
Output of "L", signal I becomes "L", the output is "H" next to the NOR1, green indicator D ₁ is turned on, N
Since the input of OR2 becomes "H" and "L", the red indicator D ₂ becomes non-lighting state of the prior power supply stop in this case are displayed.

FIG. 3 shows another embodiment of the open / close position display device for the electric open / close member according to the present invention. In the embodiment shown in the figure, the upper and lower limit switches Lm _1, Lm _2-1, Lm _2-2 are provided at positions close to the shutter in the above-mentioned embodiment, but the upper and lower limit switches are shown. L
This is the case where m _{1 and} Lm ₂ are incorporated inside the AC motor M.

Upper and lower limit switches Lm _1, Lm
Reference numeral ₂ has a normally-closed contact, and although not shown, it is opened / closed by a movable piece that is decelerated and rotates separately from the rotating shaft of the AC motor M. The upper limit switch Lm ₁ and the lower limit switch Lm ₂ are set to operate in correspondence with the fully open state and the fully closed state of the shutter.

In this embodiment, except when the changeover switch SW is connected to the reverse rotation terminal B at the time of power feeding, the current detection circuit 1 outputs "when the shutter is not fully closed.
The H "signal is supplied to the logic circuit 2. In this case, the photocoupler PC is supplied with power via the winding m ₁ , the capacitor C ₁ and the lower limit switch Lm _2. Therefore, in the case of this embodiment as well, The same operation as that of the embodiment is performed, and the same effect is obtained.

[0028]

As described above in detail in the embodiments,
According to the open / close position display device for an electric open / close member according to the present invention, the position of the open / close member before power supply is stopped can be displayed when power supply is restored with a relatively simple configuration.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an overall configuration of an embodiment of an open / close position display device for an electric open / close member according to the present invention.

FIG. 2 is an explanatory diagram showing an operation sequence of the apparatus of FIG.

FIG. 3 is a circuit diagram showing an overall configuration of another embodiment of the opening / closing position display device for an electrically operated opening / closing member according to the present invention.

[Explanation of symbols]

1 Current detection circuit 2 Logic circuit M Motor SW selector switch Lm ₁ Upper limit switch Lm ₂ Lower limit switch D _1, D ₂ Indicator

Claims (1)

[Claims] 1. A device for displaying an opening / closing position of an opening / closing member such as a shutter or a blind which is vertically moved by rotational driving of a motor, wherein a changeover switch for selecting forward / reverse rotation of the motor and an opening / closing position of the opening / closing member are set. A pair of indicators for displaying, an upper limit limit switch for detecting a fully open position of the opening / closing member, a lower limit switch for detecting a fully closed position of the opening / closing member, and a lower limit limit which is interposed in a drive circuit of the motor. A current detection circuit that sends out a high level signal when the switch is not operated, and an output signal of the current detection circuit and a drive / stop signal of the motor as inputs, and when the upper limit switch is operated and the shutter is at an intermediate position. One indicator is turned on when stopped at, and the other indicator is turned on when the lower limit switch is activated. An opening / closing position display device for an electrically operated opening / closing member, comprising: