JP3398911B2 - Roll blind - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller blind that raises and lowers a screen in a horizontal direction or an inclined direction.

[0002]

2. Description of the Related Art A window blind for a skylight allows a screen to be pulled out and folded along the skylight to adjust the amount of light from the skylight. In some of such skylight blinds, in order to prevent the weight of the drawn screen from hanging, support pipes for supporting the screen are arranged below the screen at equal intervals.

In such a roll blind, the support pipe is exposed below the screen, which is aesthetically unfavorable. Therefore, in the device described in Registered Utility Model No. 2552682, the first screen for winding the screen is used.
The winding shaft and the second winding shaft for pulling out the screen can be independently driven by an electric motor, and a friction brake is built in the first winding shaft.

When the screen is folded up,
By operating so that the winding speed of the first winding shaft exceeds the unwinding speed of the second winding shaft, and absorbing the speed difference by the friction brake, appropriate tension is applied to the screen,
I try to prevent the self-driving.

When the screen is pulled out, the second
By pulling out the screen while rotating the winding shaft of (1) and activating the friction brake of the first winding shaft, a proper tension is applied to the screen to prevent the weight from hanging down.

In the roll blind disclosed in Japanese Patent No. 2750536, the roll pipe cannot be rotated anymore in a state where the screen is substantially pulled out, and the screen is further stretched and held from this state so that its own weight droops. It is designed to prevent it.

[0007]

[Problems to be solved by the invention] Registered utility model No. 255
In the device described in Japanese Patent No. 2682, since the friction brake always acts as the load of the electric motor evenly, the power consumption of the electric motor is increased and the control device for optimally controlling the rotation speed of the electric motor and the optimum friction are provided. A friction brake capable of stably holding the force is required, which complicates the structure and increases the manufacturing cost.

In the roll blind disclosed in Japanese Patent No. 2750536, sufficient tension can be applied to the screen only when the screen is almost completely pulled out, so that the weight of the screen pulled out halfway can be prevented. You cannot do it.

Further, when such a structure is applied to a roll blind for pulling out a screen by a motor, when a tension is applied to the screen, a load acting on the motor or the screen becomes excessive, so that the motor fails or the screen is damaged. Etc. may occur.

An object of the present invention is to provide a roll blind capable of reliably preventing the weight of the screen from hanging by its own simple structure.

[0011]

According to a first aspect of the present invention, a screen is wound around a screen take-up shaft, and a screen pulling device pulls an end of the screen to pull out the screen from the screen take-up shaft. In a roll blind in which a spring motor is built in the screen winding shaft and the screen can be wound around the screen winding shaft by the driving force of the spring motor, the screen winding shaft has a drawing stroke of the screen. A tension applying device for applying rotational resistance to the screen winding shaft to tension the screen is provided between the intermediate portion and the draw-out limit position.

According to a second aspect of the present invention, the tension applying device includes a moving body that moves with the rotation of the screen winding shaft, and a gap between the moving body and the screen winding shaft with the movement of the moving body. Composed of a compressed spring.

According to a third aspect of the present invention, the movable body is non-rotatably and axially movable in a side bracket that rotatably supports the screen take-up shaft, with a screw shaft screwed to the screen take-up shaft. Configured in support of.

In the present invention, the spring is a coil spring. In claim 5, the spring is a counter spring. According to claim 6, wherein the moving body, the bearing cover
The bearing cover is attached to the side bracket so as to be positionally adjustable in the rotational direction of the screen winding shaft.

According to a seventh aspect of the present invention, in the screen drawing device, the wire wound around the weight bar can be wound by a wire winding shaft that is rotationally driven by a motor.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings. In the skylight roll blind shown in FIG. 1, a screen winding shaft 1 is rotatably supported on one side of the skylight, and a screen 2 is wound around the screen winding shaft 1.
In the screen winding shaft 1, the screen winding shaft 1
In addition, a spring motor 3 for applying a rotational force in the screen winding direction is built in. This spring motor 3
Is stored when the screen winding shaft 1 is rotated in the screen drawing direction, and is deactivated when the screen winding shaft 1 is rotated in the screen winding direction. A weight bar 4 is attached to the pull-out end of the screen 2.

A wire winding shaft 5 is rotatably supported on the other side of the skylight, and a motor (not shown) is built in the wire winding shaft 5. Then, the wire winding shaft 5 is rotated in the forward and reverse directions by the operation of the motor.

Pulleys 6 are provided at both ends of the weight bar 4.
Is rotatably supported, and the drive wire 7 inserted into the weight bar 4 is guided through the pulley 6 toward the wire winding shaft 5.

The drive wire 7 guided from both ends of the weight bar 4 toward the wire winding shaft 5 is wound around the wire winding shaft 5. Therefore, when the wire winding shaft 5 is rotated in the winding direction of the drive wire 7 by the operation of the motor, the weight bar 4 moves to the wire winding shaft 5.
When the wire winding shaft 5 is rotated in the unwinding direction of the drive wire 7, the screen 2 is pulled out from the screen winding shaft 1 by moving toward the screen, and the screen 2 is rotated by the action of the spring motor. To be wound up.

In the screen winding shaft 1, a tension applying device 8 for preventing the drawn screen 2 from hanging down by its own weight.
Is built in. The specific configuration of the tension applying device 8 will be described below.

A bearing member 10 is fixed to the side bracket 9 supporting the screen winding shaft 1, and the side bracket 9 covers the bearing member 1 so as to cover the bearing member 10.
The base end of 1 is fixed.

As shown in FIG. 3, at the base end of the bearing cover 11, mounting recesses 12 are formed at equal intervals at 45 degree intervals on the outer peripheral edge thereof. Then, the bearing cover 11 is fixed to the side bracket 9 by screwing the screws 13 inserted into the alternate mounting recesses 12 into the side bracket 9.

The tip end of the bearing cover 11 is formed in a cylindrical shape, and a hexagonal hole 14 is formed in the cylinder, and the hexagonal hole 14 has a head portion of a moving body 15 composed of a hexagonal bolt in the axial direction. Only movably supported by. The screw shaft 15a of the moving body 15 is projected from the bearing cover 11.

A through hole 16 is formed in the center of the moving body 15, and a support shaft 17 whose base end is supported by the bearing member 10 is inserted through the through hole 16. An end cap 18 is fitted to the end of the screen winding shaft 1, and a through hole 19 is formed in the center of the end cap 18.
Are formed. At the tip portion of the end cap 18, the through hole 19 is formed as a large diameter portion 19a into which the tip portion of the bearing cover 11 can be rotatably fitted. Therefore, the screen winding shaft 1 is rotatably supported by the bearing cover 11.

In the intermediate portion of the end cap 18, the through hole 19 is formed as a screw hole 19b into which the screw shaft 15a of the moving body 15 can be screwed.
The screw shaft 15a is screwed into 9b. Therefore, when the screen winding shaft 1 is rotated, the moving body 15 moves to the hexagonal hole 14
When the screen winding shaft 1 is moved in the axial direction and the screen winding shaft 1 is rotated in the drawing direction of the screen 2, the screw shaft 15a enters the screw hole 19a.

At the tip of the end cap 18, the through hole 19 has a smaller diameter than the screw hole 19b and is formed as a small diameter portion 19c into which the spindle 17 can be fitted.
The tip of the support shaft 17 is penetrated.

The small diameter portion 1 is provided at the inner portion of the screw hole 19b.
A coil spring 20 having a diameter larger than 9c is inserted. Therefore, when the screw shaft 15a enters into the screw hole 19b based on the rotation of the screen take-up shaft 1, the tip of the screw shaft 15a eventually contacts the end of the coil spring 20 as shown in FIG. The coil spring 20 is compressed.

When the number of rotations of the screen winding shaft 1 until the screen 2 is completely pulled out reaches the remaining number of rotations, that is, when the screen 2 is pulled out to about 3/4 of its moving stroke, the screw is used. The end of the shaft 15a is set so as to contact the coil spring 20.

Spindle 1 passing through the end cap 18
A bearing 21 is rotatably supported at the tip of the screen 7, and the bearing 21 is fitted to the inner peripheral surface of the screen winding shaft 1.

Next, the operation of the roll blind constructed as above will be described. When the motor in the wire winding shaft 5 is operated to rotate the wire winding shaft 5 in the wire winding direction, the weight bar 4 moves in the wire winding shaft 5 direction and the screen 2 is pulled out. Then,
The spring motor 3 is gradually charged.

At this time, the moving body 15 moves as the screen winding shaft 1 rotates, and the end of the screw shaft 15a approaches the coil spring 20. When the screen 2 is pulled out to about 3/4 of its moving stroke,
As shown in FIG. 4, the end of the screw shaft 15a comes into contact with the tip of the coil spring 20 to gradually compress the coil spring 20.

Then, the frictional force between the end of the screw shaft 15a and the tip of the coil spring 20 and the coil spring 20.
Since the frictional force between the base end of the screen and the end cap 18 gradually increases and the rotational resistance of the screen winding shaft 1 increases, the screen 2 is pulled out in a tense state. And
When the screen 2 is pulled out to the maximum, the operation of the motor is stopped.

On the other hand, when the screen 2 is folded,
When the wire winding shaft 5 is rotated in the wire rewinding direction, the screen winding shaft 1 is rotated by the spring motor 3 in the screen winding direction, and the screen 2 is wound up.

Then, based on the rotation of the screen winding shaft 1, the moving body 15 moves, the screw shaft 15a is separated from the coil spring 20, and the state shown in FIG. 2 is restored. With the roll blind configured as described above, the following operational effects can be obtained. (1) The skylight can be opened and closed by pulling out or folding the screen 2. (2) When the screen 2 is pulled out to about 3/4, for example, the rotational resistance of the screen take-up shaft 1 can be increased and the screen 2 pulled out from the screen take-up shaft 1 can be tensioned. Therefore, it is possible to prevent the self-weight sag of the screen 2, which tends to occur as the length of the screen 2 drawn out increases. (3) By removing the bearing cover 11 from the side bracket 9 and rotating it to adjust the distance between the screw shaft 15a of the moving body 15 and the coil spring 20 when the screen 2 is folded, the screen take-up shaft. The range in which the rotational resistance of unit 1 is increased can be adjusted. (4) The screwing position of the screw shaft 15a and the screw hole 19b is set to 45.
Since the distance can be adjusted in degrees, the distance between the screw shaft 15a and the coil spring 20 can be finely adjusted to increase the rotation resistance of the screen take-up shaft 1 and the range when the screen 2 is pulled out to the maximum. The frictional force between the screw shaft 15a and the coil spring 20 can be finely adjusted. (5) In the roll blind that pulls out the screen 2 by the driving force of the motor, it is possible to prevent the weight of the screen 2 from hanging down with a simple configuration. (Second Embodiment) FIG. 5 shows a second embodiment. In this embodiment, a spiral spring 22 is used instead of the coil spring 20 of the first embodiment.

With this structure, the same operational effects as those of the above-described embodiment can be obtained, and the rotation resistance of the screen winding shaft 1 can be set to the maximum drawing position of the screen 2 as compared with the above-described embodiment. The screen 2 can be tensioned by rapidly increasing it in the vicinity. (Third Embodiment) FIG. 6 shows a third embodiment. In this embodiment, the bearing cover 11 is rotatably fitted to the bearing member 10 fixed to the side bracket 9,
The bearing cover 11 is attached to the side bracket 9 with a screw 13, and the support shaft 17 and the bearing 21 of the first embodiment are attached.
By omitting the above, the bearing cover 11 is used as the bearing of the screen winding shaft 1, and other configurations are the same as those in the first embodiment.

With such a structure, the same effects as those of the first embodiment can be obtained, and the number of parts can be reduced as compared with the first embodiment.

The above embodiment can be modified as follows. The wire winding shaft 5 may be rotationally driven by manual operation.

[0038]

As described above in detail, the present invention can provide a roll blind capable of reliably preventing the weight of the screen from hanging by itself with a simple structure.

[Brief description of drawings]

FIG. 1 is a bottom view showing a roll blind of a first embodiment.

FIG. 2 is a cross-sectional view showing the tension applying device of the first embodiment.

FIG. 3 is a front view showing a bearing cover.

FIG. 4 is a cross-sectional view showing the operation of the tension applying device.

FIG. 5 is a cross-sectional view showing a tension applying device of a second embodiment.

FIG. 6 is a cross-sectional view showing a tension applying device according to a third embodiment.

[Explanation of symbols]

1 screen winding shaft 2 screen 3 Spring motor 8 Tensioning device

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E06B 9/00 B65H 75/00

Claims (7)

(57) [Claims] 1. A screen winding shaft is wound around the screen, and a screen pulling device pulls an end portion of the screen so that the screen can be pulled out from the screen winding shaft. A spring motor is provided in the screen winding shaft. In a roll blind in which a screen can be wound around a screen winding shaft by a driving force of the spring motor, the screen winding shaft is provided with a portion from an intermediate portion of a drawing stroke of the screen to a drawing limit position. Then, a roll blind is provided with a tension applying device for applying rotational resistance to the screen winding shaft to tension the screen. 2. The tension applying device is compressed between a moving body that moves with the rotation of the screen winding shaft and between the moving body and the screen winding shaft with the movement of the moving body. The roller blind according to claim 1, wherein the roller blind is formed of a spring. 3. The moving body supports a screw shaft screwed on the screen take-up shaft on a side bracket rotatably supporting the screen take-up shaft such that the side bracket is non-rotatable and axially movable. The roller blind according to claim 2, wherein the roller blind is configured as follows. 4. The roller blind according to claim 2, wherein the spring is a coil spring. 5. The roller blind according to claim 2, wherein the spring is a counter spring. Wherein said moving body, and non-rotatably on the bearing cover movably supported in the axial direction, the bearing cover is attached adjustably positioned in the rotation direction of the screen winding shaft with respect to said side bracket The roll blind according to claim 3, wherein 7. The screen drawing device is capable of winding a wire wound around the weight bar by a wire winding shaft driven to rotate by a motor. Roll blinds listed.