JPH02167982A - Motorized roll blind - Google Patents

Abstract

PURPOSE:To facilitate replacement of a roll pipe and prevent generation of noises, by driving the roll pipe for winding a screen by a supersonic motor fixed on a bracket at the other side of the roll pipe. CONSTITUTION:A roll pipe 10 for winding up and winding off a screen 50 is supported to be freely rotatable by brackets 20, 21 located at both sides. Next, a supersonic motor 30 is installed at one of the brackets 20 and connected with the roll pipe 10 via a square shaft 40 directly connected with a driving shaft 34. The roll pipe 10 can be rotated reversible by the supersonic motor 30 installed on the bracket 20. Manufacture and replacement of the roll pipe 10 becomes easier thereby and a gear-noiseless roll blind on operating the screen 50 can be obtained.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in electric roller blinds.

[Prior Art] Conventional motors used in electric roll blinds are long in the axial direction and require a reduction gear.

As disclosed in Utility Model Application Publication No. 59-26193, etc., it was built into a roll pipe.

[Problems to be Solved by the Invention] In order to incorporate the motor into the roll pipe, there is a problem in that it is necessary to perform special processing on the roll pipe, and it is not easy to replace the roll pipe.

The present invention was made to solve this problem, and its purpose is to provide an electric motor that eliminates the need for roll pipe processing to incorporate a motor and allows the roll pipe to be replaced independently of the motor. Our goal is to provide roll blinds.

[Means for Solving the Problem] In order to achieve the above object, the means adopted by the present invention is to attach an ultrasonic motor to a bracket of a roll blind,
The shaft end member of the roll pipe is rotatably connected to the drive shaft of the ultrasonic motor, either directly or via an intermediate shaft bearing on a bracket.

[Operation] When a high-frequency power source is connected to the ultrasonic motor and two high-frequency voltages with different phases are applied to the piezoelectric electrodes of the ultrasonic motor, the elastic body of the ultrasonic motor is excited and a unidirectional traveling wave is generated. , the moving body or drive shaft rotates in one direction. When the phase difference of the high-frequency voltage is reversed, the traveling wave travels in the opposite direction and the drive shaft is reversed. Therefore, when the roll pipe is connected to the drive shaft so as to rotate together, the screen can be raised and lowered by controlling the high frequency voltage applied to the piezoelectric body and rotating the drive shaft. Since the moving body and the elastic body come into frictional contact, the holding torque of the ultrasonic motor is greater than the starting torque, and the ultrasonic motor has a self-locking function. Since the ultrasonic motor is flat in the axial direction, the length of the roll blind in the axial direction increases only slightly even if it is attached to the outer surface of the bracket.

Since the ultrasonic motor has low speed and high torque and does not need to be decelerated, there is no need for a reduction gear mechanism.

[Example] A roll blind of the present invention will be described based on an example shown in the drawings.

As shown in FIG. 1, shaft end members 11, 12 are inserted and fixed at both ends of the roll pipe 10 of the roll blind. The shaft end member 11 on the fixed end side is rotatably fitted onto the fixed shaft 14 via the ball 13. The outer end protrusion 15 of the fixed shaft 14 is formed into a square shaft, and the bearing member 22 of the bracket 21
is inserted into the square hole 23 of. The fixed shaft 14 is a roll pipe l
It is provided with an extension part 18 extending along the axis of O, and a spring mounting cylinder 17 is fixed to the tip of the extension part. The shaft end member 11 is cylindrical and has a spring mounting tube 18 on the outer periphery of its inner end.
is formed, and a spring 19 is attached between the shaft end member spring attachment tube 18 and the fixed shaft spring attachment tube 17.

An ultrasonic motor 30 is mounted on the outer surface of the bracket 20 on the rotating end side.
is installed. The ultrasonic motor 30 has an annular piezoelectric body 31
The elastic body 32 constitutes a stator, and the slider 33 and drive shaft 34, which are sequentially stacked on the elastic body, constitute a rotor. The whole is housed in a motor case consisting of a base 35 and a lid 38. The drive shaft 34 protrudes on both sides in the axial direction, and a leaf spring 37 and a washer 38 are fitted to the outer protrusion. A bearing 38 is fitted to the inner protrusion, and the tip has a square shaft 40.
Although not shown, the base 35 is screwed to the brackets 20 at the four corners. The square shaft 40 passes through the shaft hole 25 of the bracket 20 and projects toward the roll pipe.A square shaft hole 24 is provided in the shaft end member 12 on the 0-rotation end side, and the square shaft of the drive shaft 34 is inserted into the square shaft hole. 40 is fitted.

Therefore, the drive shaft 34 and the roll pipe 10 are directly connected and rotate together.

Instead of inserting the square shaft of the drive shaft into the square shaft hole of the shaft end member of the roll pipe, as shown in FIG. 2
6 may be fixed, and the square shaft 26 may be inserted into the square shaft hole 41 provided at the axis of the drive shaft 34 of the ultrasonic motor 30.

Further, as shown in FIG. 3, a bearing member 27 is attached to the shaft hole 25 of the bracket 20, and the intermediate shaft 2B is rotatably inserted into the bearing member. may be inserted into the square shaft hole 24 of the shaft end member 12 and the square shaft hole 41 of the drive shaft 34 of the ultrasonic motor 30, respectively.

Next, the operation of the roll blind of the present invention will be explained. The ultrasonic motor 30 is a known traveling wave type, and the piezoelectric body 3
Two high-frequency voltages having different phases are applied to 1 via a control device (not shown). A bending elastic traveling wave is generated in the stator consisting of the piezoelectric body 31 and the elastic body 32, and the slider 3 above it
3 and a drive shaft 34 rotate integrally with the roll pipe 10 in the direction opposite to the traveling wave to wind up the screen 50. When the phase shift of the high frequency voltage is reversed by the control device, the drive shaft 34 and the roll pipe 10 are reversely rotated and the screen 50 is rolled down.

The spring 18 in the roll pipe lO uses elastic repulsive force to apply torque in the direction of winding up the screen 50 to the roll pipe lO.
It acts on O. This torque is set to balance the torque of lowering the screen due to its own weight including the weight bar, so the torque required to raise and lower the screen 50 is small. Therefore, the torque of the ultrasonic motor 30 The screen 50 can be raised and lowered sufficiently. Since the holding torque of the ultrasonic motor 30 when it is stopped is significantly larger than the output when it is rotating, it is possible to block the torque based on the weight of the spring 19 or the screen 50, and the ultrasonic motor 30 has a sufficient self-locking function. Since the sonic motor 30 is flat in the axial direction, even if it is attached to the outer surface of the bracket 20, the length of the entire roll blind in the axial direction increases only slightly, and since a reduction gear is not used, there is no problem when the screen is raised and lowered. There is no strange gear noise.

The ultrasonic motor 30 does not require any special processing on the roll pipe 10, and the roll pipe 10 is connected to the ultrasonic motor 3.
It can be exchanged at any time regardless of 0.

[Effects of the Invention] As described above, the electric roll blind of the present invention has a flat ultrasonic motor attached to a bracket, and its drive shaft is Since the roll pipe is rotationally driven, there is no need to perform any special processing on the roll pipe, the roll pipe can be easily replaced, and furthermore, there is an excellent effect that gear noise is not generated when the screen is raised and lowered.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electric roller blind according to one embodiment of the present invention, and FIGS. 2 and 3 are sectional views of main parts of other embodiments. In the figure, reference numeral 10 indicates a roll pipe, 21 and 22 a bracket, 28 an intermediate shaft, 30 an ultrasonic motor, and 34 a drive shaft.

Claims (1)

[Claims] 1) An electric roll blind consisting of a roll pipe around which a screen is wound, left and right brackets that rotatably support the roll pipe, and a motor that rotationally drives the roll pipe, the motor comprising an ultrasonic motor, The ultrasonic motor is fixed to one bracket, and the roll pipe is connected to the drive shaft of the ultrasonic motor directly or via an intermediate shaft bearing on the bracket so as to rotate together with the roll pipe. Electric roller blinds.