JPH0328203B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to improvement of a control device for a curtain motor. More specifically, the present invention relates to an improvement in a control device for a curtain motor. This relates to a device that automatically stops the motor even in the event of an accident such as getting caught on something.

[Prior Art] A device developed by the Japanese Patent Publication Publication No. 1973 (1972) that not only automatically stops the curtain motor when the curtain is opened or closed too tightly, but also stops the motor when an abnormality occurs during opening or closing. As disclosed in Japanese Patent No. 49285, a method is known in which the load current of a motor is extracted and detected, and when the load current suddenly increases, the power supply circuit of the motor is cut off. However, in the case of an abnormal situation where the curtains become gradually tangled,
In this method, since the load current does not increase rapidly, there is a risk that an abnormality will not be detected.

As a method for improving this, the inventor of the present application first
A tachometer generator that is directly driven by the motor is provided, and the output voltage of the tachometer generator is detected.
We proposed a device that stops the motor when the output voltage drops below a predetermined value (Utility Application No. 127270/1986 (Utility Model Application No. 36789/1989)). According to this device, when the load increases and the motor speed decreases, the motor automatically stops, so it was possible to detect an abnormal situation such as a curtain becoming gradually tangled and stop the motor.

However, since this proposed device uses a high-speed tachometer generator that is directly connected to the motor, it is expensive, and if slip occurs between the curtain drawstring and the motor pulley, the desired effect cannot be obtained. For large motors with large
It was found that it was unsuitable for large motors because slips on the curtain drawstring and motor pulley were unavoidable.

[Object of the Invention] The present invention is a device that can stop the motor not only when the curtain finishes opening/closing, but also when the curtain becomes gradually tangled during opening/closing. To provide a device that does not require a motor and does not cause any trouble even if there is a slip between a motor pulley and a curtain drawstring.

[Technical means to achieve the purpose] As a technical means to achieve the above purpose,
The device of the present invention includes a detection pulley rotationally driven by a curtain drawstring, a tachometer generator that rotates integrally with the pulley, and a motor control device into which the output voltage of the tachometer generator is input, and the output voltage of the tachometer generator is controlled by the motor. When the value falls below a predetermined value after the start-up period has elapsed, the relay in the main circuit of the motor is turned off and the motor is stopped.

The control circuit includes a relay operation circuit that opens and closes the relay in the main circuit of the motor, and an absolute value circuit that extracts the absolute value of the forward voltage from the AC voltage of the tachogenerator.
It consists of an amplifier circuit that takes out the forward voltage via a constant voltage diode, amplifies it, and applies it to the transistor base of the relay operating circuit.

The motor and tachogenerator are mounted on the base plate, and the motor pulley and detection pulley are fixed with the output shaft and rotating shaft protruding parallel from the base plate, and the guide pulley that can swing around the output shaft and extends toward the rotating shaft is fixed on the base plate. A plate is attached, two springs are attached to the base plate to pull the guide pulley fixing plate in a direction perpendicular to its extension direction, a pair of guide pulleys are rotatably provided on the guide pulley fixing plate, and the motor pulley of the detection pulley and A pair of guide pulleys are rotatably attached to the base plate on the opposite side, and the two curtain drawstrings hooked onto the motor pulley are placed along the detection pulley so as to sandwich them. is squeezed by two pairs of guide pulleys.

[Operation] The detection pulley is in frictional contact with the curtain drawstring and rotates at a rotational speed corresponding to the running speed of the curtain drawstring. When the detection pulley rotates, the coaxial tachogenerator rotates and generates an alternating current voltage according to the rotation speed. The absolute value voltage of the generated AC voltage is taken out by the absolute value circuit, and the voltage is input to the amplifier circuit via the constant voltage diode and amplified.
The amplified voltage is applied to the transistor base of the relay operating circuit. When the transistor is conductive, the relay operating circuit holds the relay in the motor's main circuit on, but when it is not conductive, it turns off the relay, thereby stopping the motor. Therefore, when the curtain string stops or the running speed reaches a constant value, the absolute value extracted from the output voltage of the tachogenerator becomes less than the Zener voltage of the constant voltage diode, and the input to the amplifier circuit is blocked by the constant voltage diode. As a result, there is no voltage applied to the transistor base and the transistor becomes non-conducting. As a result, the relay operating circuit turns off the motor's main circuit, so the motor stops.

Since the tachogenerator is not directly connected to the motor, an expensive high-speed type is not necessary, and an inexpensive low-speed type may be used. Also, if a step occurs between the motor pulley and the curtain string, the tachometer geator directly connected to the motor cannot detect the speed of the curtain string.
Since the tachometer generator of the present invention is directly driven by the curtain drawstring, it is possible to constantly detect the speed of the curtain drawstring.

The curtain drawstring, which is hung on the motor pulley and becomes two strips, comes into contact with the detection pulley so as to sandwich it, but it is squeezed by two pairs of guide pulleys on both sides of the detection pulley.In particular, the guide pulley on the motor pulley side is held in position by a spring. Since the curtain drawstring is pivoted to the guide pulley fixing plate which is regulated, the state in which the curtain drawstring is in contact with the detection pulley is maintained constant, and slippage between the detection pulley and the curtain drawstring is prevented.

[Example] The apparatus of the present invention will be described based on an example shown in the drawings. As shown in FIGS. 1 and 2, the main body of the tachometer generator 18 and the curtain drive motor 1
9 are both screwed to the base plate 11, and a motor pulley 17 is fixed to the output shaft of the motor. Guide pulley fixing plate 10 coaxial with the motor
is rotatably attached, and its fixed plate is held on the base plate 11 via a pair of springs 16. A pair of guide pulleys 15 are pivotally attached to a guide pulley fixing plate 10, and a curtain drawstring 12 hung on a motor pulley 17 is squeezed. The curtain drawstring 12 pulled out from the guide pulley 15 contacts both sides of the detection pulley 14 fixed to the rotating shaft of the tachometer generator 18 . A pair of guide pulleys 13 are pivoted to a base plate 11 on the curtain drawer drawer side of the detection pulley 14, so that the curtain drawer 12 in contact with the detection pulley 14 is slightly squeezed.

As shown in FIG. 3, the base plate 11 is fixed to a wall surface, and the motor pulley 17 and the detection pulley 1
The curtain drawstring 12 pulled out from the curtain rail 20 is connected to a vertical two-wheel guide pulley 21 provided on the curtain rail 20.
The guide pulley 22 is rotated in a horizontal position. A pair of curtains 30 are hung on the curtain rail 20 via runners 23, and the left and right leading runners 24 are respectively locked to one and the other of the curtain drawstrings 12 running along the curtain rail 20.

As shown in FIG. 4, the relay circuit of the capacitor motor 19 includes forward and reverse relays r1 and r2 that respectively connect both terminals of the capacitor to an AC power source. A constant voltage circuit is connected to an AC power supply via a transformer T1, and an absolute value circuit is connected to the constant voltage circuit through the transformer T1.
Voltage is supplied to the amplifier circuit and relay operation circuit.

The output voltage of the tachometer generator 18 is input in an inverted and non-inverted state to an absolute value circuit consisting of two operational amplifiers OP, and is outputted from the circuit as a rectified absolute value voltage. The output voltage is applied via a constant voltage diode D to the base of the transistor TR1 of the amplifier circuit. The collector of the transistor TR1 receives voltage from the constant voltage circuit, and the emitter is input to the base of the transistor TR2 of the relay operation circuit, so that Darlington connection amplification is performed.

The relay operating circuit includes forward and reverse rotation relay coils R1 and R2 that open and close the relay, and forward and reverse rotation self-holding switches S1 and S whose one end is connected to each relay coil and the other end is connected to a manual switch ST.
2, and forward and reverse rotation time-limited manual switches A and B, each of which has one end connected to a respective relay coil and the other end to a switch ST, and the relay coils R1 and R2 are connected to the collector of a transistor TR2. .

Next, the operation of the apparatus of the present invention will be explained. Although not shown, when the forward rotation (or reverse rotation) push button is pressed, A (or B) is turned on, and a voltage is directly applied from the constant voltage circuit to the base of the transistor TR2. As a result, the transistor TR2 becomes conductive and the forward (or reverse) rotation relay coil R1 (or R2) is energized and turns on the relay r1 (or r2) of the relay circuit, so the motor 19 rotates in the forward (or reverse) direction.
do. At the same time, self-holding switch S1 (or S2)
Also enters.

During the start-up period, the speed of the motor 19 is slow, so the speed of the curtain drawstring 12 is also slow. Therefore,
The output voltage of the generator 18 is lower than the Zener voltage of the constant voltage diode D, and the output voltage of the transistor TR
Since no voltage is applied to the base of transistor TR1, transistor TR1 is non-conductive and the amplifier circuit does not function. However, during that time, the time-limited return switch A (or B) remains on, so that a voltage is directly applied to the base of the transistor TR2 from the constant voltage circuit. Therefore, transistor TR2 remains conductive and relay coil R1 (or R
2) will not cut out, that is, the motor 18 will not stop. After the start-up period has elapsed, switch A (or B) is turned off, but before that, the speed of the motor 18 reaches a constant speed, and the curtain drawstring 12 also runs at a constant speed to rotate the detection pulley 14, so that the tachogenerator The output voltage of transistor 18 also becomes higher than the Zener voltage of constant voltage diode D, and a voltage is applied to the base of transistor TR1 to make it conductive, and the amplified voltage is applied to the base of transistor TR2.

Needless to say, when the curtain string stops when the curtain is fully opened or completely closed, if the curtain gets caught on something and the running speed of the curtain string decreases, the rotational speed of the detection pulley 14 also slows down and the tachometer is activated. The output voltage of the regulator 18 also decreases. Diode D with preset output voltage
When the Zener voltage is below the transistor TR
No voltage is applied to the base of transistor TR1, and transistor TR1 becomes non-conductive. Then, the voltage applied to the base of transistor TR2 also disappears, and transistor TR2 also becomes non-conductive, so the relay operating circuit turns off and relay coil R1 (or
2) is demagnetized, relay r1 (or r2) is turned off, and motor 19 is stopped.

In this manner, by appropriately setting the Zener voltage of the diode D, even if an abnormality occurs during opening and closing of the curtain, the motor can be stopped before the curtain or the curtain opening/closing device is damaged.

[Effects of the Invention] As described above, since the device of the present invention has the tacho-generator attached to the detection pulley driven by the curtain drawstring, it is possible to use an inexpensive tacho-generator for low speeds. A tachometer generator directly connected to a motor will not function if slip occurs between the curtain drawstring and the motor pulley, but the tachogenerator of the present invention is directly driven by the curtain drawstring, so it is not affected by slips between the motor pulley and the curtain drawstring. Therefore, the device of the present invention can also be used in large devices where slips are unavoidable.

The detection pulley and the motor pulley are arranged on the same base plate, and the curtain string hung on the motor pulley forms two strips that sandwich the detection pulley. Since the guide pulley on the motor pulley side is attached to a guide pulley fixing plate whose position is regulated by a spring, slippage between the curtain drawstring and the detection pulley is prevented. Therefore, since the detection pulley reliably rotates at the same circumferential speed as the curtain drawstring, the motor can be stopped appropriately in accordance with the traveling speed of the curtain drawstring.

[Brief explanation of drawings]

1 and 2 are a plan view and a side view of a device according to an embodiment of the present invention, FIG. 3 is a diagram schematically showing a curtain equipped with the device of FIG. 1, and FIG. 4 is a diagram of the device shown in FIG. FIG. 2 is a circuit diagram of the device. In the figure, 12 is a curtain drawstring, 14 is a detection pulley, 18 is a tachometer generator, 19 is a motor, A and B are manual switches, D is a constant voltage diode, TR2 is a transistor, r1 and r2 are relays, and R1 and R2 are relay coils. shows.

Claims (1)

[Scope of Claims] 1. A tachometer generator 18 that rotates according to the running speed of the curtain drawstring 12, a motor 19 that runs the curtain drawstring, and a forward voltage corresponding to the absolute value of the output voltage of the tachometer generator. An absolute value circuit that inputs the voltage to the amplifier circuit via the voltage diode O, and a switching transistor to which the output of the amplifier circuit is applied to the base.
TR1, TR2, relay coils R1, R2 connected in series to the transistors, and manual switches A, B inserted between the relay coils and the power source.
and relays V1 and V2 of a motor circuit that are opened and closed by the relay coil, and a detection pulley 14 is fixed to the rotating shaft of the tachometer generator, and the detection pulley contacts the curtain drawstring and receives the rotational drive of the curtain motor. In the control device, the output shaft of the motor and the rotating shaft of the tachometer generator are protruded in parallel from a base plate 11, and a guide pulley fixing plate 10 is swingably provided to extend toward the rotating shaft with the output shaft as the center. A pair of guide pulleys 15 are rotatably attached to a guide pulley fixing plate, and two guide pulleys are used to pull the guide pulley fixing plate with equal force from both sides in a direction perpendicular to a line connecting the output shaft and the rotating shaft. A spring 16 is provided on the base plate, a pair of guide pulleys 13 are rotatably attached to the base plate on the opposite side of the rotating shaft from the output shaft, a motor pulley 17 is fixed to the output shaft, and the motor pulley 17 is hooked onto the motor pulley. The two curtain drawstrings are arranged along the detection pulley so as to sandwich them, and the two curtain drawstrings are squeezed by the two pairs of guide rollers on both sides of the detection pulley. Curtain motor control device. 2. The curtain motor control device according to claim 1, wherein the manual switch is of a time-limited return type that returns after the start-up time of the motor has elapsed. 3. The curtain motor control device according to claim 1 or 2, characterized in that a set of forward rotation and reverse rotation relays, a relay coil, and a manual switch are respectively provided.