JPH0132933Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electric opening/closing device for opening and closing curtains, etc.

Conventionally, means for opening and closing curtains and the like using an electric opening/closing device using an electric motor such as a capacitor motor has, for example, the following configuration. That is, as shown in FIG. 1, pulleys 2 and 3 are attached to both ends of a curtain rail 1, an endless wire 4 is wound around these pulleys 2 and 3, and one of the pulleys is used as a drive pulley 3 to drive a motor 5. Rotate by. A leading curtain runner 7 on which the opening/closing end 6a of the curtain 6 is hooked is connected to a predetermined portion of the endless wire 4, and therefore, the leading curtain runner 7 is connected to the curtain along with the movement of the endless wire 4. It moves within the rail 1, and as a result, the curtain 6 is opened and closed. Furthermore, limit switches (not shown) connected in series in a main circuit for operating an electric motor 5 are attached to both ends of the curtain rail 1. These limit switches cut off the main circuit for operating the electric motor 5 when the leading curtain runner 7 comes into contact with its contacts, that is, when the opening/closing operation of the curtain 6 is completed.

The prior art as described above has the following problems. That is, if the leading curtain runner 7 becomes unable to move at an intermediate portion of the curtain rail 1 due to some kind of obstacle, there is a risk that an overload will be applied to the electric motor 5 and the electric motor 5 will be burnt out. Also,
The limit switch (including the cord, etc.) has the drawback of detracting from the overall aesthetic appearance of the curtain 6. Another drawback is that the installation of the limit switch is complicated, including the wiring work.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to be able to accurately stop the electric motor when the opening/closing operation of curtains, etc. is completed without using a limit switch, and to prevent runners such as leading curtain runners from encountering any obstruction. An object of the present invention is to provide an electric opening/closing device capable of accurately stopping an electric motor even when the electric motor becomes immovable at an intermediate portion of a rail such as a curtain rail.

In order to achieve the above object, the present invention is characterized by the following structure.

In other words, a current detection signal is input from the main circuit in which the motor, the primary winding of the detection transformer, the AC control element, and the power supply are connected in series, and the secondary winding of the detection transformer, and this current detection signal is at a predetermined level. A control circuit that sends out a main circuit sheath disconnection signal when the voltage exceeds the threshold, and inputs the main circuit sheath disconnection signal sent from this control circuit, and controls the above-mentioned AC control element based on this main circuit sheath disconnection signal. and a detection resistor connected in parallel with the primary winding of the detection transformer and having an impedance sufficiently lower than that of the primary winding of the detection transformer. .

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

FIG. 2 is a diagram showing the configuration of an embodiment of the present invention. Reference numeral 11 in the figure indicates a main circuit for operating the electric motor 5. The main circuit 11 is formed by connecting in series an electric motor 5 such as a capacitor motor, a primary winding 12a of a detection transformer 12, a triac 13 as an example of an AC control element, and a power source 14. The electric motor 5 moves the leading curtain runner 7 to open and close the curtain 6, for example, in a configuration similar to that shown in FIG. 1.

A control circuit 15 is connected to the secondary winding 12b of the detection transformer 12. This control circuit 1
Reference numeral 5 inputs the voltage induced in the secondary winding 12a of the detection transformer 12 as a current detection signal, and when this current detection signal exceeds a predetermined level, a main circuit disconnection signal is sent out. Further, a triac control circuit 16 is connected to the output side of the control circuit 15. This triax control circuit 16
Based on the main circuit failure signal sent from the control circuit 15, the current flowing between T ₁ and T ₂ of the triac 13 is turned off to cause the main circuit 11 to become disconnected. It is a means. That is, the triack control circuit 1
6 serves to reduce the current between T ₁ and T ₂ of the triac 13 to below the holding current when a main circuit disconnection signal is input. Furthermore, a switching device 17 is connected to the input side of the triac control circuit 16. And the triack control circuit 1
6 turns the triac 13 ON and OFF to conduct the main circuit 11 by controlling the gate trigger voltage of the triac 13 or the current between T ₁ and T ₂ based on a predetermined command signal from the switching device 17. I refuse.

Reference numeral 18 in the figure is a detection resistor connected in parallel to the primary winding 12a of the detection transformer 12. This detection resistor 18 has a sufficiently smaller impedance than the primary winding 12a of the detection transformer 12. Such a detection resistor 18 functions to eliminate the following problems. That is, main circuit 1
In order to detect the current value flowing therein, the primary winding 12a of the detection transformer 12 is inserted in series with the primary winding 12a, but the power consumed by the primary winding 12a is a loss. Electric motor 5 by minute
This will limit the current that can flow to the Therefore,
When the detection resistor 18 is not connected in parallel,
It is necessary to reduce the resistance value of the primary winding 12a. However, such a detection transformer 12 is expensive and large, which in turn makes the entire electric switchgear expensive and large. The detection resistor 18 eliminates this problem. That is, since the impedance of the detection resistor 18 is sufficiently smaller than that of the primary winding 12a, most of the current flowing in the main circuit 11 flows through the detection resistor 18, and the loss is extremely small. Therefore, there is no need to reduce the winding resistance of the detection transformer 12, and even if the resistance value is somewhat large, it can be small and inexpensive.

In addition, the reference numeral 19 in the figure is a light emitting diode,
When the main circuit 11 is in an energized state, it lights up to indicate the state. This light emitting diode 19
is installed exposed on the main body of the electric switchgear. By observing the light emitting diode 19, it is possible to discover an abnormality such as, for example, the curtain 6 is not being opened or closed even though the main circuit 11 is energized.

Next, the operation will be explained.

When the switching device 17 outputs a predetermined command signal to the triax control circuit 16, the triax control circuit 16 applies a gate trigger voltage to the triax 13 based on the command signal, making the main circuit 11 conductive, and as a result, the motor 5 The opening/closing operation of the curtain 6 is performed by this. When the opening and closing of the curtain 6 is completed, the leading curtain runner 7 becomes immovable, and as a result, an overload acts on the electric motor 5 and an excessive current flows through the main circuit 11. This excessive current causes the secondary winding 12b of the detection transformer 12 to generate a current detection signal exceeding a predetermined level. Thus, the control circuit 15 and the triax control circuit 16 operate,
The triax 13 turns OFF, cutting off the main circuit 11. Even if the leading curtain runner 7 becomes unable to move at an intermediate position of the curtain rail 1 due to some kind of failure, an overload will be applied to the electric motor 5 and an excessive current will flow through the main circuit 11. The circuit is soon broken.

In this way, the electric opening/closing device of this embodiment can accurately stop the electric motor 5 when the opening/closing operation of the curtain 6 is completed without using a limit switch, and can prevent the leading curtain runner 7 from moving between the curtain rails 1 due to some kind of obstruction. The electric motor 5 can be accurately stopped even if it becomes unable to move at a certain location. Further, by connecting the detection resistor 18 in parallel to the primary winding 12a of the detection transformer 12, the detection transformer 12 can be made smaller and lower in price. Furthermore, the light emitting diode 19 allows for rapid detection of abnormalities in the device.

Note that the present invention is not limited to the above-mentioned embodiment. For example, the opening/closing mechanism for curtains and the like is not limited to the configuration shown in FIG. Furthermore, the connection location of the light emitting diode 19 is not limited to the location shown in FIG.
Any location may be used as long as it can emit light in response to the energized state. Furthermore, this invention is blind,
Of course, it can also be applied to opening and closing accordion doors, doors, shutters, etc.

As is clear from the above description, according to the present invention, it is possible to accurately stop the electric motor when the opening/closing operation of curtains, etc. is completed without using a limit switch, and when the runner, such as the leading curtain runner, It is possible to accurately stop the electric motor even if the motor becomes unable to move at the intermediate portion of the rail, and furthermore, the detection transformer and the entire device can be made smaller and lower in price.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a curtain opening/closing mechanism using an electric opening/closing device, and FIG. 2 is a circuit diagram showing the configuration of the electric opening/closing device according to an embodiment of the present invention. 1...Curtain rail, 2 and 3...Pulley,
4...Endless wire, 5...Electric motor, 6...Curtain, 7...Leading curtain runner, 11...Main circuit, 12...Detection transformer, 12a...Primary winding, 12b...Secondary side Winding wire, 13...triax (AC control element), 14...power supply, 15...
Control circuit, 16... Triack control circuit, 17
... Switching device, 18 ... Detection resistor, 19
...Light emitting diode.

Claims (1)

[Scope of utility model registration request] A current detection signal is input from the main circuit in which the motor, the primary winding of the detection transformer, the AC control element, and the power supply are connected in series, and the secondary winding of the detection transformer, and this current detection signal exceeds a predetermined level. A control circuit that sends out a main circuit break signal when the main circuit breaks, and a control circuit that inputs the main circuit break signal sent from this control circuit and controls the AC control element based on the main circuit break signal. A means for cutting off the main circuit;
An electric switchgear characterized by comprising: a detection resistor having an impedance sufficiently lower than the primary winding of the detection transformer, the detection resistor being connected in parallel with the primary winding of the detection transformer.