JPH0328204B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an improvement of a control device for a curtain motor, and more specifically, the present invention relates to an improvement in a control device for a curtain motor, and 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 when an accident occurs.

[Prior Art] A device that not only automatically stops the curtain motor when the curtain is opened or closed tightly, but also stops the motor when an abnormality occurs during opening or closing is proposed by the Japanese Patent Publication No. 51- As disclosed in Japanese Patent No. 49285, a method is known in which the load current of a motor is extracted and detected, and the power supply circuit of the motor is cut off when the load current increases rapidly. However, in the case of an abnormal situation where the curtains become gradually tangled,
Since the load current does not increase rapidly, there was a risk that an abnormality would not be detected using this method.

As a method for improving this, the inventor of the present application proposed a device using a tachogenerator (Utility Application No. 58-127270, (Utility Patent Application No. 60-36789), Japanese Patent Application No. 120841-1984 (Japanese Unexamined Patent Application No. 1986-12084)
61-314)). Since this device controls the motor power supply circuit based on the output voltage of the tachogenerator, which rotates as the curtain drawstring runs, it can also respond to abnormal situations such as the curtain becoming gradually caught.

[Problems to be Solved by the Invention] However, when a tachogenerator is used, there is a limit to miniaturization and cost reduction of the device.

In view of the above, an object of the present invention is to provide a curtain motor stop device that can be made smaller and lower in price.

[Means for Solving the Problem] In order to achieve the above object, a first means characterized by the present invention is to provide a detection pulley driven by frictional contact with the curtain drawstring, and to provide a detection pulley with a plurality of detection pulleys on the rotating surface of the pulley. permanent magnets are installed symmetrically about the axis,
A Hall element is disposed close to the rotating surface of the pulley, and if the cycle of the output voltage of the Hall element generated by the rotation of the pulley becomes longer than a certain value corresponding to a predetermined curtain string speed, that is, slip occurs in the curtain string. Another reason is that a control circuit is provided to cut off the power supply circuit of the curtain motor. The second method is to fix a motor pulley to a motor shaft protruding from the top surface of a motor box, provide a swingable lever on the top surface of the same motor box, provide a spring to pull the lever toward the motor pulley, and attach a detection pulley to the lever. It is mounted so that it can rotate freely.

[Operation] When the curtain drawstring runs, the detection pulley that comes into frictional contact with it rotates. When the detection pulley rotates, a permanent magnet attached to the detection pulley periodically approaches the Hall element, so that the Hall element periodically outputs voltage pulses. The time width of this output pulse is shaped into a pulse with a constant time width by a control circuit including a CR circuit and a monostable multi-circuit, and the pulse is input to a switching transistor to make it conductive. When the switching transistor is conducting, the power circuit of the curtain motor is closed, and when the switching transistor is non-conducting, the power circuit is open. The time width of this shaping pulse is set to be equal to or slightly longer than the period of the pulse generated by the Hall element when the curtain string runs without slipping. Therefore, unless the curtain drawstring slips, a continuous voltage is input to the switching transistor, so that the switching transistor is conductive and the curtain motor continues to rotate. When the curtain opens and closes to its limit and the curtain string slips, or when the curtain gets caught on something and the curtain string slips, the rotation of the detection pulley slows down, and the period of the pulse generated by the Hall element is set in advance accordingly. Since the time width is longer than the time width of the shaping pulse, the voltage input to the switching transistor is intermittent, the switching transistor becomes non-conductive, and the motor rotation stops. Since the detection pulley reliably comes into contact with the curtain drawstring by the second means, the detection pulley reliably rotates at the same circumferential speed as the curtain drawstring.

[Effects] As mentioned above, the device of the present invention not only operates the motor when the curtain is opened or closed to its limit, but also when an abnormal situation such as the curtain gets caught on something occurs, just like a device that uses a tachogenerator. Although it can be stopped immediately, the Hall element has the advantage of being significantly smaller and cheaper than the tachogenerator. Furthermore, since the detection pulley of the present invention reliably rotates at the same circumferential speed as the curtain drawstring, the device has the effect of accurately stopping the motor in accordance with the speed of the curtain drawstring.

[Example] The apparatus of the present invention will be explained based on the apparatus shown in the drawings. As shown in FIG.
is fixed to a wall surface, and a curtain drawstring 12 hung on a motor pulley 17 circulates between a vertical two-wheel guide pulley 21 and a horizontal one-wheel guide pulley 22 provided on a curtain rail 20. curtain rail 20
A pair of curtains 30 and 31 are suspended via runners 23, and leading runners 24 are fixed to one and the other of curtain strings running along the curtain rail 20.

As shown in FIG. 3, a geared motor M for driving a curtain drawstring is attached to a motor box 11, a motor pulley 17 is fixed to a motor shaft 13 protruding from the top surface of the box, and a curtain drawstring 12 is hung on the motor pulley. motor box 1
A lever 18 is swingably attached to the upper surface of the motor pulley 1 via a pin 16, and the lever is moved toward the motor pulley 17 via a spring 19. A detection pulley 14 is rotatably fixed to the lever and pressed against a curtain drawstring around a motor pulley 17. Four permanent magnet bars 15 are attached to the detection pulley 14 symmetrically with respect to the rotation axis. A Hall element IC1 is arranged on the locus circle of the permanent magnet 15 on the upper surface of the motor box 11, and a printed board 25 is arranged in the box below. motor box 1
A power cord 26 and an operation cord 27 are pulled out from the side of the device 1, and an operation box 28 is attached to the tip of the operation cord 27. The operation box 28 has push button switches SU, SD, and buttons for raising, lowering, and stopping.
ST will be established.

As shown in Fig. 1, the power supply circuit of the capacitor motor M is provided with forward/reverse relays RL1 and RL2 connected to both terminals of the capacitor, and a transformer T.
A constant voltage circuit including IC1 is connected through the terminal.
The output of the rectifier section of the circuit is input to the relay operating circuit, and the output of the constant voltage section is input to the Hall element IC2.

The relay operation circuit is relay RL1, RL of the power supply circuit.
Forward/reverse relay coil RLC1, which opens and closes 2.
RLC2, forward/reverse self-holding switches RLS1, RLS2 with one end connected to each relay coil and the other end connected to a manual stop pushbutton switch ST; also one end connected to each relay coil and the other end connected to a stop pushbutton switch ST. The forward/reverse time-limited return pushbutton switches SU and SD are connected in parallel, and the relay coil RLC
1 and RLC2 are both connected to the collector of the switching transistor TR of the control circuit.

In addition to Hall element IC2 and transistor TR, the control circuit includes capacitors C1, C2, C3 and resistor VR.
1, VR2, R1, R2, R3, and three monostable multi ICs 3, which shape the output pulse of the Hall element IC2 into a pulse with a predetermined time width. The process of forming pulses at points A, B, C, D, E, F, and G on the control circuit is as shown in Figure 4, and the time width of the pulse output by the Hall element is expanded to t2 and t3. Ru. Therefore, if the pulse generation period of the Hall element IC2 is shorter than t3, a conduction voltage is always applied to the point G, that is, the base of the transistor TR. This time width is the same as or similar to the period of the pulse generated by the Hall element IC2 when the curtain drawstring 12 shown in FIGS. 1 and 2 runs without slipping with the motor pulley 17 and rotates the detection pulley 14. It is set slightly longer. Therefore, as long as the curtain drawstring 12 runs without slipping, the transistor TR is conductive and the relay coil RLC1 or RLC2 remains on.
Since the power supply circuit of motor M remains closed, motor M continues to rotate. However, if the curtain string 12 slips against the motor pulley 17 due to the curtain opening or closing too tightly or getting caught on something on the way, the rotation of the detection pulley 14 will slow down and the pulse generation period of the Hall element IC2 will change to the shaping pulse. The time width becomes longer than the time width t3, and the voltage applied to the base of the transistor TR becomes intermittent, making the transistor TR non-conductive. When transistor TR becomes non-conductive, relay coil RLC1 or RLC2 turns off,
Relay RL1 or RL2 of the power supply circuit opens and motor M stops.

In addition, during the start-up period until the rotation of the motor M and the running of the curtain drawstring reach a certain speed, the terminals of the time-return manual switches SU and SD are connected to the terminals of the transistor TR so that the transistor TR does not become non-conducting. Connect to the base and set the time limit return time to be longer than the rise period.

[Brief explanation of drawings]

1 is a circuit diagram of a device according to an embodiment of the present invention, FIG. 2 is a schematic diagram of a curtain equipped with the device of the present invention, FIG. 3 is a partially cutaway view of the motor box of FIG. 2, and FIG. FIG. 4 is a diagram showing the process of forming pulses generated by the Hall element. In the figure, reference numeral 12 is a curtain drawstring, 14 is a detection pulley, 15 is a permanent magnet, 17 is a motor pulley, M is a motor, IC2 is a Hall element, and TR is a transistor.

Claims (1)

[Claims] 1. A motor M and a motor pulley 17 of the motor.
A detection pulley 14 rotates due to frictional contact between the curtain drawstring 12 hung on the curtain drawstring and the curtain drawstring.
, a permanent magnet 15 attached to the rotating surface of the detection pulley, a Hall element ICI disposed close to the rotating surface, and a transistor while the period of the output voltage of the Hall element is shorter than a predetermined value. In the curtain motor stop device, the braking circuit is provided with a braking circuit that makes the transistor conductive, but when it becomes long, makes the transistor non-conductive and cuts off the current supply to the motor. A motor pulley is fixed, a lever 18 is slidably pivoted on the upper surface of the motor box, the lever is pulled toward the motor pulley via a spring 19, and the detection pulley is rotatably attached to the lever. This curtain motor stop device is characterized by: 2. Claim 1, characterized in that the braking circuit consists of a circuit that shapes the output voltage pulse of the Hall element into a pulse with a constant time width using a plurality of series-connected CR circuits and a monostable multi-circuit. Curtain motor stop device.