JP2001027081A - Roll blind - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll blind capable of adjusting the tension of a wire without adjusting a bearing position of a pulley supported by window frame or the like. SOLUTION: Wires 5 winding both ends on a wire driving shaft 2 are connected to a front bar 4, a winding shaft 2 and the wire driving shaft 2 are rotationally driven by a common driving device, and in a roll blind for making the motions of pulling out and winding off a screen by winding back the other of the winding shaft 2 and wire driving shaft 2 when one of them makes the motion of winding off the screen a fixed pulley 9 and a movable pulley 12 are provided to the inside of the front bar 4, the wires 5 are inserted into the front bar 4, at the same time, the wires are put on the fixed pulley 9 and movable pulley 12, the movable pulley 12 is energized in the direction separated from the fixed pulley 9 with an energizer 13, and an adjusting device for adjusting the tension of the wires 5 is provided by adjusting energizing force of the energizer 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen drive device for a roll blind.

[0002]

2. Description of the Related Art A skylight roll blind allows a screen to be drawn out and folded along a skylight so as to adjust the amount of light emitted from the skylight. As one type of such a skylight blind, Utility Model Registration Publication No. 25
No. 50032 discloses that a wire can be wound on both ends of a winding shaft for winding a screen, and the screen can be rewound from the winding shaft and pulled out when winding the wire by rotating the winding shaft. There is disclosed an apparatus in which a wire can be rewound when a screen is wound around a winding shaft.

[0003] In such a roll blind, a pulley (front pulley) supported by a window frame or the like is movably supported on the drawer side of the screen in order to adjust the tension of the wire. The tension of the wire is adjusted by adjusting the support position of the pulley.

[0004]

In the above-described roll blind, if the pulley is moved in a direction away from the winding shaft in order to adjust the tension of the wire, the screen is pulled out to the maximum when the screen is pulled out to the maximum. The gap between the front bar (support plate) at the edge and the pulley increases,
There is a problem that it is not aesthetically pleasing.

An object of the present invention is to provide a roll blind capable of adjusting the degree of tension of a wire without adjusting the position of a pulley supported by a window frame or the like.

[0006]

According to the present invention, one end of a screen is wound around a winding shaft rotatably supported by a support bracket, and a front bar is attached to the other end of the screen. A wire whose both ends are wound around a wire driving shaft is connected to the front bar, and the winding shaft and the wire driving shaft are rotationally driven by common driving means, so that one of the winding shaft and the wire driving shaft is wound. In a roll blind for performing screen withdrawing and winding operations by unwinding the other at the time of the taking operation, the wire is inserted into the front bar, and the wire is urged in the front bar in the tension direction. There is provided an urging means and an adjusting device for adjusting the urging force of the urging means.

In the second aspect, a fixed pulley and a movable pulley are provided in the front bar, the wire is mounted on the fixed pulley and the movable pulley, and the moving pulley is separated from the fixed pulley by a biasing means. And the tension of the wire is adjusted by adjusting the urging force of the urging means with the adjusting device.

According to a third aspect of the present invention, the adjusting device supports the movable pulley movably in a longitudinal direction of the front bar, connects one end of a coil spring to the movable pulley, and connects the other end of the coil spring to the movable pulley. The front bar is movably supported in the longitudinal direction so that the biasing force can be adjusted.

According to a fourth aspect of the present invention, the other end of the coil spring is hooked on a hook, a screw shaft is formed at a base end of the hook, and a nut screwed on the screw shaft cannot be moved with respect to the front bar. And the nut is rotated so that the urging force of the coil spring can be adjusted.

According to a fifth aspect of the present invention, the wire drive shaft is provided at both ends of the winding shaft, and the winding diameter of the wire by the wire driving shaft is set to be larger than the winding diameter of the screen by the winding shaft. The moving length of the wire based on the rotation of the wire driving shaft is set longer than the moving length of the screen based on the rotation of the winding shaft, and the coil spring is used as absorbing means for absorbing a difference between the moving lengths of the wire and the screen.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In the skylight roll blind shown in FIG. 1, a winding shaft 2 is rotatably supported between support brackets 1a and 1b attached to one side of the skylight, and one end of a screen 3 is wound around the winding shaft 2. Is being worn.

A motor (not shown) is provided in the winding shaft 2.
The winding shaft 2 is rotated in the screen drawing direction or the screen winding direction by the operation of the motor.

The other end of the screen 3 is a front bar 4
The front bar 4 has a wire 5 mounted thereon. That is, the front bar 4 is formed in a groove shape in which the screen drawing direction is opened, and pulleys 6a and 6b are attached to both ends thereof.

One end of the wire 5 inserted into the front bar 4 is wound around one end of the winding shaft 2 via a pulley 7a attached to a window frame or the like in a screen drawing direction from the pulley 6a. Is being worn.

The other end of the wire 5 inserted into the front bar 4 passes through a pulley 7b attached to a window frame or the like from the pulley 6b in the screen pulling-out direction. It is wound around the end.

When the winding shaft 2 is rotated in the screen winding direction, the wire 5 is unwound from the winding shaft 2, and when the winding shaft 2 is rotated in the screen rewinding direction, the wire 5 It is configured to be wound around the winding shaft 2. The winding diameter of the wire 5 is set to be slightly larger than the winding diameter of the screen 3.

An adjusting device for adjusting the tension of the wire 5 is provided in the front bar 4. The specific configuration of the adjusting device will be described. As shown in FIG. 3, a base member 8 is disposed at an intermediate portion of the front bar 4, and the base member 8 has a screw 8 at the end on the pulley 6a side.
a is fixed to the front bar 4.

A fixed pulley 9 is immovably supported at the end of the base member 8 on the side of the pulley 6b. A guide groove 10 is formed in an intermediate portion of the base member 8 in a longitudinal direction of the front bar 4, and a movable base 11 is movably supported in the guide groove 10.

On the fixed pulley 9 side of the movable base 11, a movable pulley 12 is rotatably supported. As shown in FIG. 4, the fixed pulley 9 and the movable pulley 12 are composed of three consecutive pulleys.

One end of a coil spring 13 is attached to the side of the pulley 6 a of the moving base 11, and the other end of the coil spring 13 is hooked on a hook 14. A screw shaft 15 is formed at the bar-shaped base end of the hook 14, and the screw shaft 15 is inserted through the side of the base member 8 on the side of the pulley 6a. The nut 17 is screwed.

By rotating the adjusting nut 16 with the fixing nut 17 loosened, the hook 14 is moved in the longitudinal direction of the base member 8 and the coil spring 1 is moved.
The biasing force of No. 3 can be adjusted.

The wire 5 is guided into the front bar 4 via the pulley 6a, mounted on a fixed pulley 9, guided by a moving pulley 12, and moved from the moving pulley 12 to a pulley 6b.
To the outside of the front bar 4 via the pulley 6b. The wire 5 mounted in a loop between the fixed pulley 9 and the movable pulley 12 is mounted so as not to interfere with each other by the two pulleys 9 and 12 formed of a triple pulley.

Next, the operation of the electric window blind constructed as described above will be described. As shown in FIG. 1, when the screen 3 is wound around the winding shaft 2 and the front bar 4 is positioned near the winding shaft 2, the coil spring 1
3 is in a substantially contracted state, and the movable pulley 12 is located away from the fixed pulley 9.

In this state, when the take-up shaft 2 is rotated in the screen pull-out direction, the screen 3 is unwound from the take-up shaft 2 and the wire 5 is taken up by the take-up shaft 2, so that the screen 3 is pulled out. As shown in FIG. 5, the front bar 4 is pulled out to the vicinity of the pulleys 7a and 7b.

At this time, since the moving length of the wire 5 is longer than the moving length of the screen 3, the moving pulley 12 moves toward the fixed pulley 9 against the urging force of the coil spring 13, and Is stretched. The tension of the wire 5 is gradually increased by the urging force of the coil spring 13, and the screen 3 is tensioned between the front bar 4 and the winding shaft 2 by the tension of the wire 5.

When the winding shaft 2 is rotated in the screen winding direction, the screen 3 is wound on the winding shaft 2 and the wire 5 is unwound from the winding shaft 2. At this time, since the moving length of the wire 5 is longer than the moving length of the screen 3, the moving pulley 12 moves in a direction away from the fixed pulley 9, and the coil spring 13 contracts. Therefore, the coil spring 13 functions as an absorbing means for absorbing a difference in the movement length between the wire 5 and the screen 3.

When the fixing nut 17 is loosened and the adjustment nut 16 is rotated in the state shown in FIG. 1, the screw shaft 15 moves in the axial direction. As shown in FIG. 6, when the screw shaft 15 is moved toward the pulley 6a, the hook 14 moves in the same direction, and the coil spring 13 is extended. When the screw shaft 15 is moved toward the moving pulley 12, the hook 14 moves in the same direction and the coil spring 13 contracts.

By such an operation, the initial urging force of the coil spring 13, that is, the tension at the initial stage of winding the wire 5 is adjusted. After the adjustment operation, the fixing nut 17 is tightened to fix the adjustment nut 16 so that it cannot rotate.

With the roll blind constructed as described above, the following effects can be obtained. (1) The skylight can be opened and closed by pulling out the screen 3 from the winding shaft 2 or winding the screen 3 around the winding shaft 2. (2) The degree of tension of the wire 5 can be adjusted by operating the adjustment nut 16. (3) Even if the tension of the wire 5 is adjusted, the screen 3
Bar 4 and pulley 7a,
7b does not change, so the screen 3
It does not lower the aesthetics of the user in the state in which he is pulled out. (4) Since the adjusting device for adjusting the degree of tension of the wire 5 is accommodated in the front bar 4 and is not exposed to the outside, the appearance can be improved. (5) Since the wire 5 is looped between the fixed pulley 9 and the movable pulley 12, the coil spring 13
The wire 5 having a length twice as long as the moving distance of the moving pulley 12 can be moved and tensioned by the urging force.

The above embodiment can be modified as follows. -The winding shaft 2 may be rotatable by manual operation. -It is good also as a roll blind which raises and lowers the screen 3 vertically. As shown in FIG. 7, the degree of tension of the wire 5 may be adjustable without using the fixed pulley 9 and the movable pulley 12. That is, between the pulleys 6a and 6b in the front bar 4, the coil spring 18 and the tension adjusting device 19 may be interposed at an intermediate portion of the wire 5.

The tension adjusting device 19 includes a male screw shaft 20.
Are screwed into the female screw shaft 21, and both ends thereof are connected to the wire 5. The female screw shaft 21 is rotatably connected to the wire 5.

With this configuration, by operating the female screw shaft 21, the coil spring 18 can be expanded and contracted, and the degree of tension of the wire 5 can be adjusted. A male screw shaft 20 and a female screw shaft 21 of the tension adjusting device 19;
Alternatively, the tension of the wire 5 may be adjusted by using a worm mechanism, and winding or unwinding the wire 5 with the worm mechanism to expand and contract the coil spring 18.

[0033]

As described in detail above, the present invention can provide a roll blind capable of adjusting the degree of tension of a wire without adjusting the position of a pulley supported by a window frame or the like.

[Brief description of the drawings]

FIG. 1 is a plan view showing a roll blind for a skylight according to an embodiment.

FIG. 2 is a front view showing a skylight roll blind.

FIG. 3 is a plan view showing a wire tension adjusting device.

FIG. 4 is a front view showing the wire tension adjusting device.

FIG. 5 is a plan view showing a state where a screen is pulled out.

FIG. 6 is a plan view showing the operation of the wire tension adjusting device.

FIG. 7 is an explanatory diagram showing another example.

[Explanation of symbols]

 1a, 1b Support bracket 2 Winding shaft, wire drive shaft 3 Screen 4 Front bar 5 Wire 9 Fixed pulley 12 Moving pulley 13 Urging means (coil spring) 14 Adjusting device (hook) 16 Adjusting device (adjusting nut)

Claims (5)

[Claims] An end of a screen is wound around a winding shaft rotatably supported by a support bracket, a front bar is attached to the other end of the screen, and both ends are wound around a wire drive shaft. Connected wire to the front bar,
The take-up shaft and the wire drive shaft are rotationally driven by a common drive unit, and the screen is pulled out and taken up by rewinding one of the take-up shaft and the wire drive shaft during the take-up operation of the other. In the roll blind, the wire is inserted into the front bar, and the front bar includes an urging means for urging the wire in a tensioning direction, and an adjusting device for adjusting the urging force of the urging means. Roll blinds characterized by that. 2. A fixed pulley and a movable pulley are provided in the front bar, the wire is mounted on the fixed pulley and the movable pulley, and the movable pulley is attached in a direction away from the fixed pulley by the urging means. The roll blind according to claim 1, wherein the tension of the wire is adjusted by adjusting the urging force of the urging means with the adjusting device. 3. The adjusting device supports the movable pulley movably in a longitudinal direction of the front bar,
3. The moving pulley, wherein one end of a coil spring is connected, and the other end of the coil spring is supported on the front bar so as to be movable in a longitudinal direction thereof, so that an urging force can be adjusted. Roll blinds as described. 4. The other end of the coil spring is hooked on a hook, a screw shaft is formed at a base end of the hook, and a nut screwed on the screw shaft is immovably and rotated with respect to the front bar. The roll blind according to claim 3, wherein the roller blind is supported so as to be able to adjust the urging force of the coil spring by rotating the nut. 5. The wire driving shaft, wherein the wire driving shaft is provided at both ends of the winding shaft, and a winding diameter of the wire by the wire driving shaft is set to be larger than a winding diameter of a screen by the winding shaft. The moving length of the wire based on the rotation of the winding shaft is set to be longer than the moving length of the screen based on the rotation of the winding shaft, and the coil spring is an absorbing means for absorbing a difference in the moving length between the wire and the screen. The roll blind according to claim 3.