JP2606435B2 - Roll blind - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a roll blind.

[Prior art] Conventionally, the screen of a roll blind is raised and lowered manually using a pull cord or a chain.
In the automatic method, a direct current motor or the like is used.

[Problems to be Solved by the Invention] When a DC motor or the like is used in an automatic manner, the output shaft of the DC motor is generally connected via a reduction gear in relation to the rotation speed and output torque of the output shaft of the DC motor. According to this, the noise caused by the gears in the speed reducer is severe, and this is one problem particularly in a roll blind used indoors. Further, in order to obtain a large torque, a large DC motor must be used. For example, when a compact roll blind is to be installed near a window, the large DC motor may be an obstacle.

The present invention has been made in view of the above points, and an object of the present invention is to provide a roll blind provided with a driving device that generates extremely little noise when the screen is wound up and down.

It is another object of the present invention to provide a roll blind having a driving device for raising and lowering a screen, which can generate a required torque in a small shape.

[Means for Solving the Problems] According to the present invention, the object is to provide a projecting shaft member attached to one end of a bracket, and one end rotatably supported by the shaft member. A cylindrical body, an ultrasonic motor for rotating the cylindrical body, and a shaft disposed inside the cylindrical body, one end of which is spline-connected to the inner surface of the cylindrical body, and the other end of which projects into the cylindrical body. The ultrasonic motor includes a coil spring for canceling a load fixed to a member, and a rotor fixed to the other end of the bracket and a rotor spline-connected to the inner surface of the other end of the cylindrical body. And a friction member interposed between the stator and the rotor, and pressing means disposed inside the cylindrical body and elastically pressing the rotor toward the stator via the friction member. The cylindrical body has a shaft at one end This is achieved by a roll blind, which is rotatably supported on the bracket, respectively, via the material and, at the other end, via the rotor of the ultrasonic motor.

As the ultrasonic motor in the present invention, various types such as a standing wave type and a composite vibration type can be used. In one preferred example, a composite vibration type having an elliptical motion generating means can be applied. In this case, the elliptical motion generating means and the rotor are in frictional contact via a friction member, and the pressing means is configured to elastically press the rotor against the elliptical motion generating means via the friction member. ing.

In one example, the present elliptical motion generating means includes a torsional vibrator and a vertical vibrator, and the torsional vibrator and the vertical vibrator generate an elliptical motion, and the elliptical motion rotates the rotor.

According to the present invention, the coil spring, which is an elastic member, has a shaft member having one end spline-connected to the inner surface of the cylindrical body, connected to the rotor via the cylindrical body, and the other end protruding into the cylindrical body. And connected to the stator of the ultrasonic motor via the shaft member and the bracket. In this way, the connection mode of the coil spring to the rotor and the stator of the ultrasonic motor is directly The connection is not limited to a typical one, but may be indirectly connected via other components. In short, the ends may be connected to the rotor and the stator so as to cancel the load of the load.

In the coil spring of the present invention, it is not necessary to cancel all the loads accurately, and the cancellation amount may be determined in relation to the output torque of the ultrasonic motor. In other words, it is sufficient to cancel the load to such an extent that the load can be driven by the ultrasonic motor.

In addition, in the case where the noise of the reduction gear is a problem, the present invention is preferable because the reduction gear can be omitted. On the other hand, when the noise of the reduction gear does not matter, the reduction gear is used. May be.

[Operation] According to the present invention, since the coil spring cancels the load, the ultrasonic motor drives the load under the canceled load during operation. Therefore, the ultrasonic motor can drive the load with a small output power.

Hereinafter, the present invention will be described in more detail based on specific examples shown in the drawings. This will clarify the invention described above and other inventions. It should be noted that the present invention is not limited to these specific examples.

[Specific Example] In FIGS. 1 and 2, one end 3 of a screen 2 is wound around a cylindrical body 1, and when the cylindrical body 1 is rotated in a direction A about a rotation center 4, a screen is formed. 2 is hoisted down in the B direction. A protruding shaft member 8 attached to a bracket 7 penetrates a center hole 6 of a disk 5 fixed to one end of the inner surface of the cylindrical body 1, and the cylindrical body 1 is at one end by the shaft member 8. It is supported rotatably in the direction. A coil spring 9 as an elastic member for canceling a load is disposed in the cylindrical body 1. One end 10 of the spring 9 is spline-coupled to the shaft member 8, and the other end 11 is spline-coupled to the inner surface of the cylindrical body 1. Are connected respectively to the disks 12 attached by the Thus, in this example, the other end 11 of the coil spring
Are spline-connected to the inner surface of the cylindrical body 1 via the disc 12.

The other end of the inner surface of the cylindrical body 1 is provided with a rotor of the ultrasonic motor 13.
14 is attached by spline connection, and rotor 14
Rotates in the A direction, the cylindrical body 1 also rotates in the A direction.

In the composite vibration type ultrasonic motor 13, each of the threaded rods 15 has a disk-shaped or columnar spring support 1.
6, a washer 17, a spring receiver 18, and holding members 19 and 20 are inserted through through holes provided in each of them.
A thrust bearing 24 is sandwiched between washers 22 and 23 between a nut and a nut 21 screwed to one end of the rod 15, and an elliptical motion generating means is provided between the spring receiver 16 and the washer 17 by a rotor 14. Coil spring 25 which is a pressing means for pressing elastically
However, between the rotor 14 and the holding member 19, a vertical vibrator 27 made of a piezoelectric element or the like is interposed via a friction member 26, and the holding members 19 and 20
Between the electrode plate 28 which is also the stator of the ultrasonic motor 13
Between them, torsional vibrators 29 and 30 each composed of a piezoelectric element or the like forming an elliptical motion generating means together with the vertical vibrator 27 are inserted respectively. A nut 31 is screwed to the other end of the rod 15. Vertical vibrator 27, clamping member 19, torsional vibrator 29, electrode plate
28, the torsional vibrator 30 and the holding member 20 are firmly adhered to each other at the joint surface by an adhesive or the like, and the rotor 14 and the friction member 26 are mutually bonded at the joint surface by the same adhesive or the like. Strongly adhered. Note that the friction member 26 may be bonded to the longitudinal vibrator 27 instead of bonding to the rotor 14.
Accordingly, the rotor 14 is pressed against the longitudinal vibrator 27 via the friction member 26 by the spring 25 and is in frictional contact with the longitudinal vibrator 27 with respect to rotation in the A direction. The ultrasonic motor 13 is attached to the bracket 7 by screws or the like via an electrode plate 28 which is also a stator. Accordingly, the spring 9 is connected at one end to the rotating body 14 via the disk 12 and the cylindrical body 1 and at the other end to the electrode plate 28 as a stator via the shaft member 8 and the bracket 7.

The roll blind 36 of the present invention having the driving device 35 configured as described above is attached via the bracket 7 to, for example, a window. When the screen 2 is hoisted and lowered, a high-frequency voltage is applied to each of the torsional vibrators 29 and 30 and the longitudinal vibrator 27, whereby the torsional vibrators 29 and 30
Numeral 30 is alternately twisted in the direction A about the center line 4, and the vertical vibrator 27 vibrates in the direction along the center line 4, and the torsional vibrator 29
When the phase of the high-frequency voltage applied to each of the vertical oscillators 27 and 30 is a specific phase, the friction member 26 of the vertical oscillator 27
As a result, the friction member 26 and, consequently, the rotor 14 are rotated in the direction A by the elliptical movement, and the rotation of the rotor 14 causes the cylindrical body 1 to move to the A position.
The screen 2 is wound up and down in the B direction. The washer 23 and the spring holder 1 are rotated with the rotation of the rotor 14.
6, 18, the spring 25 and the washer 17 are also rotated, but this rotation is not transmitted to the washer 22 side by the thrust bearing 24, so that the rod 15 follows the torsional motion together with the holding member 20.

By the way, in the roll blind 36 having the driving device 35, since the ultrasonic motor 13 is used, the rotation of the rotor 14 can be reduced, so that the load can be directly driven without a reduction gear or the like, and the noise can be reduced. It can be very small.

On the other hand, in the drive device 35, in the case of lowering, the spring 9 is tightened, and conversely, the spring force of the spring 9 increases.
In the case of winding, the spring 9 is connected to the ultrasonic motor 13 so that the spring 9 is loosened and the spring force of the spring 9 is reduced, in other words, the load of the screen 2 as a load is canceled. Therefore, for example, in the case of winding,
A winding force by the spring force of the spring 9 acts in accordance with the load of the screen 2 which is the load of the driving device 35. As a result, the ultrasonic motor 13 can wind the screen 2 with an extremely small output torque. In particular, screen 2
Even if the load torque applied to the cylindrical body 1 increases due to a long winding down, the spring force of the spring 9 increases correspondingly. Therefore, even in such a case, the ultrasonic motor 13 can operate with extremely small output torque. Thus, the screen 2 can be wound up.

Further, in the driving device 35, since the rotor 14 is pressed against the longitudinal vibrator 27 via the friction member 26 by the spring 25,
When the application of the high-frequency voltage to the torsional vibrators 29 and 30 and the longitudinal vibrator 27 is stopped, the rotor 14 comes into strong frictional contact with the longitudinal vibrator 27 via the friction member 26 to prevent free rotation in the A direction. Therefore, when the lifting and lowering is stopped, the cylindrical body 1 is automatically locked so as not to rotate, and the screen 2 can be held at a predetermined lifting and lowering position without providing a special lock mechanism.

It should be noted that the present invention is not limited to the above specific example, and for example, as a coil spring for canceling a load,
As a reference example, a conical coil spring 41 as used in the driving device 44 shown in FIG. 3 may be used.
That is, in the driving device 44 shown in FIG. 3, one end 42 of the spring 41 is directly fixed to the rotor 14, and the other end 43 is directly fixed to the electrode plate 28 as a stator. In addition, if it comprises like the drive device 44 as a reference example, the man-hour of installation can be reduced,
May be preferred.

[Effects of the Invention] As described above, according to the present invention, a reduction gear and the like can be omitted, so that noise during driving can be extremely reduced. Further, according to the present invention, since the load of the load is canceled by the coil spring as the elastic member, the required torque can be generated with a small shape. Further, according to the present invention, since noise can be extremely reduced and a required torque can be generated in a small shape, it is possible to preferably carry out hoisting and lowering of a screen or the like.

According to the present invention, the shaft member attached to one end of the bracket has a protruding shape, and the cylindrical body around which the screen is wound is rotatably supported at one end by the protruding shaft member, and at the other end. Since it is rotatably supported on the bracket via the rotor of the ultrasonic motor, the cylindrical body can be rotatably supported on the bracket without the need for a support shaft or the like penetrating the cylindrical body. Even if the diameter of the body itself is reduced, the inside of the cylindrical body can be used as a mounting space for a coil spring for canceling a load applied and a pressing means, and the coil can be mounted without being obstructed by a support shaft or the like. The diameter of the spring can be reduced sufficiently, the operating range of the load cancellation by the coil spring can be widened, and a compact roll blind can be provided. Also, one end of the coil spring for canceling the load is spline-connected to the inner surface of the cylindrical body, and the ultrasonic motor has a rotor spline-connected to the inner surface of the other end of the cylindrical body. , Assembly, axial adjustment, etc. can be performed very easily, manufacturing, maintenance and inspection work can be performed in a short time. Furthermore, when the diameter of the coil spring is expanded or reduced, the axial length of the coil spring can be reduced. Even if expansion or contraction occurs, this can be absorbed, and therefore, adverse effects on the pressing means due to expansion and contraction of the coil spring in the axial direction can be reduced, and the friction member is fixed. Since the pressing means interposed between the rotor and the rotor and arranged inside the cylindrical body elastically presses the rotor toward the stator via a friction member, the ultrasonic motor When stopped, the stator To be able to reliably maintain the frictional contact between the fine rotor, the rotor,
In turn, the cylinder can be stopped firmly,
Thus, unintended lowering of the screen due to its own weight can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of a preferred embodiment of the present invention, FIG. 2 is a cross-sectional view of an ultrasonic motor of the embodiment shown in FIG.
FIG. 3 is a sectional view of a reference example according to the present invention. 9 ... Coil spring, 13 ... Ultrasonic motor, 14 ... Rotator, 28 ... Electrode plate.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shunichi Nagakura 5-19-2 Yakumo, Meguro-ku, Tokyo (56) References JP-A-2-91387 (JP, A) JP-A-1-131779 (JP, A)

Claims (3)

(57) [Claims] 1. A projection-like shaft member attached to one end of a bracket, a cylindrical body that is rotatably supported at one end by the shaft member, and a screen wound around the screen, and an ultrasonic wave that rotates the cylinder. A motor and a coil spring for canceling a load that is disposed inside the cylindrical body, one end of which is spline-connected to the inner surface of the cylindrical body, and the other end of which is fixed to a shaft member protruding into the cylindrical body. Has,
The ultrasonic motor includes a stator fixed to the other end of the bracket, a rotor spline-connected to the inner surface of the other end of the cylindrical body, a friction member interposed between the stator and the rotor, and a cylindrical body. And a pressing means that is disposed inside and elastically presses the rotor toward the stator through a friction member.
A roll blind which is rotatably supported by a bracket at one end via a shaft member and at the other end via a rotor of an ultrasonic motor. 2. An ultrasonic motor comprising an elliptical motion generating means, wherein the pressing means is configured to elastically press the rotor against the elliptical motion generating means via a friction member. Item 2. The roll blind according to Item 1. 3. The roll blind according to claim 2, wherein the elliptical motion generating means comprises a torsional vibrator and a longitudinal vibrator.