JPH053103Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an opening/closing drive mechanism for an electric curtain.

(Prior Art) In recent years, in so-called electric curtains in which the curtain is opened and closed by a motor, it has been widely practiced in recent years to automatically stop the motor when the curtain is fully opened or closed. The most common conventional motor automatic stop device of this type is one in which a limit switch is provided at the open end and closed end positions of the curtain, and the switch is actuated by the movement of the curtain.

However, in the conventional limit switch mechanism described above, the width and thickness of the curtain
There is an inconvenience in that the position of the limit switch must be appropriately selected and installed in accordance with other curtain installation conditions. Furthermore, safety is not ensured in the event that a curtain is caught between windows, for example. This kind of situation can often occur in practice, but the motor will continue to rotate unless the limit switch is hit, resulting in curtains being torn off, wires being cut, etc.
Alternatively, accidents such as the motor itself seizing up often occur.

(Problem to be solved by the invention) Therefore, in order to solve the problems with conventional electric curtains, the applicant first proposed that when a load above a certain level is applied when opening and closing the curtains, a motor is used to turn the curtains. It was proposed that a mechanism (clutch mechanism) for releasing the transmission of motion be provided to relay the opening/closing operation of the curtain, thereby safely protecting each part.

This idea is an attempt to propose a simpler drive mechanism for electric curtains equipped with the above safety mechanism. Specifically, when opening and closing a normal curtain, only a start signal is given. The object of the present invention is to provide an opening/closing mechanism that automatically stops after the curtain is fully opened or closed.

(Means for Solving the Problem) That is, in the electric curtain opening/closing drive mechanism according to this invention, the wire for opening/closing the curtain is pulled by the rotation of the motor, and the curtain is opened/closed. In an electric curtain configured such that when a load above a certain level is applied to the opening/closing part, transmission of the rotation by the motor is canceled and the opening/closing operation of the curtain is relayed, the motor driving part receives a start signal. Therefore, the device is characterized in that it is provided with a timer circuit that automatically stops after driving for a certain period of time.

(Embodiment) The following will be explained according to the embodiment illustrated in the attached drawings. Fig. 1 is a sectional view showing the main parts of the opening/closing mechanism of an electric curtain, and Fig. 2 is a friction plate showing an embodiment of the clutch mechanism. 3 is a schematic circuit diagram of the curtain opening/closing mechanism, FIG. 4 is a waveform diagram showing the timer operation state, and FIG. 5 is a waveform diagram showing the state in which the stop signal is activated. It is.

To explain the outline of the opening/closing mechanism of this electric curtain based on the diagram in FIG. 1, an endless wire 10 for opening/closing the curtain is stretched between a main pulley 15 and a subordinate pulley (not shown) in the curtain rail 11. As the main pulley 15 rotates and the wire 10 is pulled, the curtain leading wheel 12 fixed to the wire moves in the left-right direction in the figure, and the curtain is opened and closed.

A main pulley 15 for opening and closing the curtain is held in a pulley holder 16 within an end cover 13 attached to the curtain rail end portion 11a. The pulley holder 16 is held movably in the longitudinal direction of the curtain rail by an adjustment bolt 17, and is configured to apply and adjust the tension of the wire 10 suspended from the main pulley 15. ing.

The main pulley 15 that pulls the wire 10 for opening and closing the curtain is rotated by a drive section 20 suspended from the curtain rail 11. In the drive unit 20, the drive of the motor 21 is transmitted to the rotating shaft 19 of the main pulley 15 via gears 22, 23, 24, 25 and a clutch member 26, as shown in the figure. In addition, the reference numeral 18 in the figure is a lever hook for suspending the drive unit 20 from the curtain rail, 50 is a control unit, and 51 is a remote control receiving unit. Note that the receiving section 51 of this remote control is freely connected to the control section 50 via a flexible tube 52. Thereby, the position of the receiving section can be set arbitrarily.

In addition, this embodiment is provided with a mechanism (clutch mechanism) that releases the transmission of rotation by the motor when a load above a certain level is applied during opening and closing of the curtain. That is, the gear 25 on the motor driving side also serves as an engagement disc for coupling the clutch, and is connected to a friction plate 26 in the clutch. The friction plate 26 is attached to a rotating shaft 19 (driven shaft) for rotating the main pulley 15, and is elastically pressed against the surface of the disc 25 via a resilient member such as a coil spring 27. . When a torque exceeding a certain level is applied to the pressure contact portion between the friction plate 26 and the engagement disk 25, in other words, when a force greater than the frictional force at the pressure contact portion between the friction plate 26 and the engagement disk 25 is applied, both The engagement state is released and the disk 25 rotates idly. In other words, the rotation of the motor 21 is not transmitted to the rotation shaft 19 of the main pulley 15, which is the driven shaft.
The curtain opening and closing part therefore ceases its operation and is not subjected to any further load.

As clearly shown in FIG. 2, in the embodiment, the driven shaft 19 is inserted through the center of the engagement disc 25, but the disc 25 is configured to be rotatable with respect to the driven shaft 19. Needless to say, it is. Reference numeral 25a is its shaft hole. On the other hand, since the friction plate 26 is attached to the driven shaft 19, it is fixed by the rotation prevention portion 19a of the shaft 19 so that it does not rotate idly. Reference numeral 26a at the bottom of FIG. 2 is a lower friction plate.

Other clutch mechanisms that release the transmission of rotation by the motor under certain overload conditions include a simple clutch structure such as a well-known engaging clutch structure in which pawls engage, or a ball clutch structure in which a ball is interposed. It will be done.

This idea is an attempt to propose a simpler drive mechanism for electric curtains equipped with the above safety mechanism, and includes a timer that automatically stops the motor drive unit after driving for a certain period of time based on a start signal. It is equipped with a circuit.

As shown in the schematic circuit diagram of FIG.
The drive switch that turns on and off is configured to be operated by a timer circuit in the control section, and as shown in the timing chart of Fig. 4, the timer circuit is started by a single activation signal. At the same time, the drive switch of the motor 21 is turned on,
The drive switch is configured to be turned off when the timer expires.

The set time of the timer in this case is, of course, the time required to open and close the curtain, and is determined depending on various conditions such as the size, weight, and type of the curtain. It takes about 4 to 5 seconds for a normal one-room double-opening curtain.

Furthermore, since the curtains may be stopped in the middle of opening or closing, leaving them in a half-open state, it is desirable to include a stop signal. Figure 5 is a timing chart when a stop signal is input while the timer circuit is in operation.By inputting the stop signal, the timer circuit is reset and initialized, and when it is turned off, the drive switch is activated. will also be suspended.

(Operation/Effect) As is clear from the above diagrams and explanations, this invention has a mechanism (clutch mechanism) that releases the transmission of rotation by the motor when a load above a certain level is applied when opening/closing the curtain. ), the motor drive section is equipped with a timer circuit that automatically stops after driving for a certain period of time in response to a start signal, making it much easier to open and close the curtain. In other words, the user only has to press the activation signal button once, and the curtains will automatically fully open or close and then stop. Of course, even if the motor is still running at the fully open or fully closed end, each part is safely protected by the safety mechanism.

Therefore, according to this invention, not only is there no need to install a limit switch or the like as in the conventional device, the curtain can be opened and closed safely and easily, and it is also structurally simple. This invention can enjoy very great practical advantages in this type of electric curtain device, such as being economical.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of the electric curtain opening/closing mechanism, Fig. 2 is a perspective view of the main parts showing an engagement structure using friction plates showing an embodiment of the clutch mechanism, and Fig. 3 is the curtain opening/closing mechanism. FIG. 4 is a waveform diagram showing the timer operating state, and FIG. 5 is a waveform diagram showing the stop signal operating state. 10... Curtain opening/closing operation wire, 15... Main pulley, 19... Driven shaft, 21... Motor, 2
2, 23, 24, 25...gear, 25...engaging disk, 26...friction plate.

Claims (1)

[Claim for Utility Model Registration] The rotation of the motor pulls the wire for opening and closing the curtain, and when a load above a certain level is applied to the curtain opening/closing part, the wire for opening and closing the curtain is pulled. In the electric curtain configured such that the opening/closing operation of the curtain is interrupted when transmission of rotation is released, the motor drive section is provided with a timer circuit that automatically stops after being driven for a certain period of time in response to a start signal. An electric curtain opening/closing drive mechanism featuring: