JPH11311079A - Roll screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll screen that can relax impact sound and impact force caused by a weight bar in a screen winding final stage. SOLUTION: This roll screen is provided with a second brake 26. The second brake 26 is composed of a screw shaft 30 fixedly supported to a side plate 14; a clutch case 32 disposed to be axially movable and relatively nonrotatable to a winding pipe 16, and moving on the screw shaft 30 in association with the rotation of the winding pipe 16; and a brake part 34 provided at the end side of the screw shaft 30. The clutch case 32 is engaged with the brake part 34 from a screen winding final stage to actuate the brake part 34, thus reducing the screen winding speed. When the screen is finally wound, the clutch case 32 is always positioned in a place where it is moved to a nonthreaded shaft 31 from the screw shaft 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll screen, and more particularly, to a roll screen capable of reducing a screen winding speed.

[0002]

2. Description of the Related Art Conventionally, as this kind of roll screen, there is one disclosed in Japanese Utility Model Publication No. 58-31616.

[0003] This is a stationary screw disposed and fixed on a rotation axis of a winding pipe of a screen, a movable coupler movable on the stationary screw with rotation of the winding pipe, and provided inside the winding pipe. The hydraulic damper comprises a piston rod and a piston that moves in the axial direction of the stationary screw following the moving coupler, and a cylinder fixed to the winding pipe. Then, the piston rod pushes oil in the hydraulic damper with the winding of the screen, and the brake is operated.

[0004]

However, in a roll screen provided with a brake as described above, the hydraulic damper always operates at the time of winding except for the start of winding, so that the screen winding speed is reduced. In the final stage of winding, the winding diameter of the screen increases,
Since the load on the screen is also reduced, the winding speed cannot be fully controlled.
There is a problem that an impact sound is generated by the weight bar when completely wound, and the impact force becomes excessive.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and the invention according to claims 1 to 5 reduces the impact noise and impact force caused by the weight bar at the final stage of winding the screen, and also reduces the screen winding. It is an object of the present invention to provide a roll screen that can reliably perform positioning at the final stage of taking.

[0006]

According to the present invention, there is provided a roll screen comprising:
A spring is housed inside a take-up pipe rotatably supported by a side plate, and the screen is wound around the take-up pipe by the energy stored by the spring, and the screen is taken up by a brake device built into the take-up pipe. In a roll screen having a reduced speed, the brake device is provided with a screw shaft fixedly supported on the side plate, and a winding pipe disposed so as to be axially movable with respect to the winding pipe and relatively non-rotatable. A clutch case that moves on the screw shaft with the rotation of the screw shaft, and a brake unit provided on the end side of the screw shaft, and when the screen is completely wound, the axis of the clutch case with respect to the winding pipe. Positioning means for positioning in the direction is further provided.

According to a second aspect of the present invention, in the roll screen according to the first aspect, the winding speed of the screen is reduced before the final stage of winding the screen. The brake unit is actuated by engaging with the, and the winding speed of the screen is further reduced.

According to a third aspect of the present invention, there is provided a roll screen, wherein the positioning means has a non-screw shaft connected to a screw shaft and having no screw.
Just before the screen is completely wound, the clutch case moves from the screw shaft to the non-screw shaft.

In a roll screen according to a fourth aspect, the positioning means according to the third aspect further includes a push spring for pushing a clutch case on a non-screw shaft to a screw shaft.

According to a fifth aspect of the present invention, there is provided a roll screen, wherein the positioning means according to the first or second aspect is formed at an end of a screw shaft to prevent movement of the clutch case, and is provided inside the clutch case. And a clutch spring interposed between a slip ring screwed to the screw shaft and a clutch case, the clutch spring comprising:
At the end of the screw shaft, the clutch case idles in the winding direction of the winding pipe.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a roll screen according to an embodiment of the present invention. A roll screen 10 mainly includes a pair of side plates 14 attached to a set frame 12 fixed to a window frame or the like, and a pair of side plates 14. A winding pipe 16 whose both ends are rotatably supported by the side plate 14, a screen 18 having one end connected to the winding pipe 16, wound around the winding pipe 16, and suspended to be able to be unwound, and a screen 18. A weight bar 17 attached to the lower end of the screen 18 and a puller 19 also attached to the lower end of the screen 18 are provided.

The coil spring 2 is provided in the winding pipe 16.
0 is housed, one end of the coil spring 20 is indirectly fixed to the side plate 14, and the other end is the first
It is fixed to the winding pipe 16 via the brake 22. When the take-up pipe 16 is rotated in the screen unwinding direction, the other end of the coil spring 20 is connected to the take-up pipe 16.
When the rotation of the winding pipe 16 in the winding direction is allowed, the winding force of the coil spring 20 causes the winding pipe 16 to rotate in the winding direction. The screen 1 is constantly decelerated by the
8 is wound up.

Further, a stopper device 24 is provided in the winding pipe 16 for stopping the rotation of the winding pipe 16 against the accumulated force of the coil spring 20 and stopping the screen 18 at a desired position. .

Further, a second brake 26 (brake device) for reducing the screen winding speed from the final stage of screen winding is provided in the winding pipe 16.

As shown in detail in FIG. 2, the second brake 26 mainly includes a screw shaft 30 fixedly supported on the side plate 14 via a stopper shaft 28 fixed on the side plate 14. The clutch case 32 includes a clutch case 32 that moves on the screw shaft 30 in accordance with the rotation of the winding pipe 16, and a brake portion 34 provided at an end of the screw shaft 30. The clutch case 32 has grooves 32a and 32b (see FIG. 3) formed on the outer peripheral surface thereof, the grooves 32a and 32b protruding in the inner diameter direction of the winding pipe 16 and fitting with a plurality of protrusions extending in the longitudinal direction. It is movable axially with respect to the pipe 16 and is not rotatable relative to the pipe 16. Further, the center hole thereof is a screw hole, and is screwed to the screw shaft 30. Therefore, when the winding pipe 16 rotates, the clutch case 32 that rotates together with the winding pipe 16 moves on the screw shaft 30 along the screw shaft 30 in the axial direction of the winding pipe 16. In FIG. 2, the winding pipe 16
Is rotated in the unwinding direction, the clutch case 32 moves to the left, and when the winding pipe 16 rotates in the winding direction, the clutch case 32 moves to the right.

A non-screw shaft 31 having a circular cross section, on which no screw is formed, is continuously connected to the screw shaft 30.
The outer diameter of 1 is set to the same outer diameter as the root of the screw of the screw shaft 30. Then, the winding pipe 16 is completely moved to the screen 18.
Is wound, the clutch case 32 is
And is set to be on the non-screw shaft 31. A bush plate 54 is provided on the outer peripheral side of the non-screw shaft 31.
The enlarged diameter portion 31 provided on the non-screw shaft 30 side of the non-screw shaft 31
The bush spring 56 is interposed between the bush spring 56 and a.
As will be described later, the non-screw shaft 31 and the bush spring 56 constitute positioning means for positioning the clutch case 32 in the winding pipe 16 in the axial direction.

The brake section 34 mainly includes a rotary brake 38 and a brake case 40 having a brake pin 40a which accommodates the rotary brake 38 and extends in the axial direction toward the clutch case 32 side. The two brake pins 40a are provided 180 degrees apart in the circumferential direction.

The rotary brake 38 includes a non-screw shaft 31,
It is attached to a fixed shaft 36 fixedly supported on the side plate 14 via a screw shaft 30 and a stopper shaft 28, and is constituted by, for example, an oil brake. That is, the oil brake includes a stator 42 fixed to the fixed shaft 36, a rotor 44 disposed on the outer peripheral side of the stator 42 and fixed to the brake case 40,
Two O-rings 46 which are fitted between the outer peripheral surface of the rotor 2 and the inner peripheral surface of the rotor 44 and are separated from each other in the axial direction; It consists of a viscous fluid 48 such as silicone oil filled in the space defined by the inner peripheral surface.

As shown in FIG. 3, the clutch case 32 has a clutch piece 50 whose one end is axially attached to the case body 32c by a pin 51, and a direction in which the clutch piece 50 is always opened to the outside of the clutch case 32. And a biasing torsion coil spring 52. Clutch piece 50 is pin 5
1 and can be swung about a torsion coil spring 52.
Always pulls one end of the clutch piece 50 toward the axial center, so that the other end of the clutch piece 50 comes into contact with the inner wall of the groove 32 b, and the clutch piece 50 is in a position opened to the outside of the clutch case 32. At the other end of the clutch piece 50, a concave engaging portion 50a capable of engaging with the brake pin 40a is formed. The radial relative positional relationship between the clutch piece 50 and the brake pin 40a is set so that the clutch piece 50 can be engaged with the brake pin 40a at a position opened to the outside of the clutch case 32. . The direction of the concave opening of the engagement portion 50a is set so that the engagement portion 50a can engage with the brake pin 40a only when the clutch case 32 is rotating together with the winding pipe 16 in the winding direction. 32 is rotating in the unwinding direction, the brake pin 40 wraps around the arc-shaped outer peripheral portion of the clutch piece 50, and the brake pin 40a
Is pivoted inward against the spring force of the torsion coil spring 52, so that the engaging portion 50a does not engage with the brake pin 40a.

The first brake 22 can be constituted by an oil brake similar to the rotary brake 38.

The operation of the roll screen configured as described above will be described.

The puller 19 attached to the lower end of the screen 18 is pulled to pull the screen 18 to the winding pipe 16
The winding pipe 16 rotates and the coil spring 20 accumulates a spring reaction force while the screen 1 is unwound.
8 goes down. At this time, the winding pipe 16 rotates while its speed is reduced by the first brake 22.
After the screen 18 has been lowered to the desired height in this way, when the stopper device 24 is actuated, the rotation of the winding pipe 16 is prevented against the stored force of the coil spring 20, and the screen 18 stops.

Next, when the screen 18 is raised, the stopper device 24 is released, and the winding pipe 16 is rotated in the winding direction by the accumulated force of the coil spring 20, and the screen 18 is wound. At this time,
The winding speed of the winding pipe 16 is reduced by the first brake 22. However, if only the first brake 22 is operated continuously from the initial stage of winding, the winding speed of the screen is increased in the final stage of winding of the screen 18, and the weight bar 17 is completely wound. The impact sound and the impact force due to are excessive. Therefore, the second brake 26 operates at the final stage of winding.

That is, the clutch case 32 moves rightward in FIG. 2 on the screw shaft 30 with the rotation of the winding pipe 16 in the winding direction.
When three turns are reached, as shown in FIG. 4, the clutch case 32 reaches a position where the clutch case 32 engages with the brake pin 40a. In the final stage of this winding, the clutch case 3
2 while the engaging portion 50a of the clutch piece 50 is rotating.
Engaging with one of the two brake pins 40a. As a result, the brake case 40 and the rotor 44 rotate together with the clutch case 32 and the winding pipe 16, while the stator 42 remains fixed.
The winding pipe 16 is decelerated via the rotor 44 by viscous resistance of the viscous fluid 48 filled between the stator 4 and the stator 42. By operating the second brake 26 at the final winding stage in this way, the winding speed of the screen 18 can be reduced, and the impact noise and impact force of the weight bar 17 can be reduced.

The clutch case 32 moves on the screw shaft 30 while the clutch piece 50 is engaged with the brake pin 40a while the clutch piece 50 slides on the brake pin 40a until the screen 18 is completely wound. I do. Then, immediately before the screen 18 is completely wound, the clutch case 32 is
4, while moving from the screw shaft 30 to the non-screw shaft 31, and spins on the non-screw shaft 31. For example, even if the axial position of the clutch case 32 in the take-up pipe 16 is shifted from the design position, and the timing at which the clutch case 32 moves from the screw shaft 30 to the non-screw shaft 31 is earlier, Only when the number of slips on the shaft 31 increases does the clutch case 32 always move from the screw shaft 30 to the non-screw shaft 31 when the screen 18 is finally completely wound up. . Next, when the take-up pipe 16 is rotated in the unwinding direction, the clutch case 32 is pressed by the push plate 54 in the screw shaft 30 direction, so that the clutch case 32 is screwed with the screw shaft 30, and leftward in FIGS. 2 and 4. Move to. Thus, the position of the clutch case 32 is calibrated.

At the time of unwinding, the clutch case 32 rotates in the direction opposite to the previous direction.
The engagement between the brake pin 40a and the brake pin 40a is disengaged, and the clutch piece 50 passes while passing the brake pin 40a outward. After a few turns, the clutch case 32 is completely separated from the brake pin 40a, and moves the screw shaft 30 in a direction away from the brake portion 34.

As described above, the second brake 26 operates only at the final stage of screen winding.

FIGS. 5 and 6 are views corresponding to FIG. 3 showing a second embodiment of the clutch piece in the clutch case of the present invention.

The clutch case 32 has a clutch piece 50 whose one end is pivotally mounted on the case body 32c by a pin 51.
And a spiral spring 57 for urging the clutch piece 50 in a direction to always close the clutch piece 32 toward the axis of the clutch case 32.
The clutch piece 50 can swing about the pin 51, and can be opened to the outside of the clutch case 32 until it comes into contact with the inner wall of the groove 32b at the maximum. Clutch piece 5
0 is the diameter of the clutch piece 50 and the diameter of the brake pin 40a so that the engaging portion 50a can engage with the brake pin 40a when the clutch case 32 is fully opened to the outside as shown in FIG. Direction relative positional relationship is set.

The clutch case 32 thus configured
In the final winding stage, when the winding speed is higher than the predetermined speed, as shown in FIG. 6, the clutch piece 50 of the clutch case 32 causes the spiral spring 5 to move by the centrifugal force.
As a result, the clutch portion 32 is opened outwardly against the spring force of 2, and the engaging portion 50a is engaged with one of the two brake pins 40a while rotating. Thus, by operating at the final stage of winding, the winding speed of the screen 18 can be reduced.

On the other hand, if the winding speed of the screen 18 does not reach a predetermined speed or more at the final stage of winding because the screen 18 is wound from a state where it is stopped at an intermediate position in the vertical direction, a large centrifugal force is applied to the clutch piece 50. As a result, the clutch piece 50 does not enter the maximum open state. Therefore, the engaging portion 50a does not engage with the brake pin 40a, and the rotary brake 38 does not operate. Since the second brake 26 does not operate as described above, it is possible to prevent the screen 18 from being decelerated too much so that the screen 18 cannot be completely wound.

When the clutch case 32 rotates in the unwinding direction, the engaging portion 50a of the clutch piece 50 and the brake pin 40
6a, the clutch piece 50 closes inwardly of the clutch case 32 by the spring force of the spiral spring 57. As shown in FIG.
State.

Thus, only when the second brake 26 is at the final stage of screen winding and the winding speed is higher than a predetermined speed,
It will work.

Next, the third embodiment of the present invention will be described with reference to FIGS.
An embodiment will be described. In the figure, the same components as those of the first embodiment are denoted by the same reference numerals, and the detailed description thereof will be omitted.

As in the second embodiment, the clutch case 58 of this embodiment has a clutch piece 50 whose one end is pivotally mounted on the case body by a pin 61, and a clutch piece wound around the pin 61. And a coil spring 62 that constantly pulls the clutch 50 toward the axis of the clutch case 58. A slip ring 64 is housed inside the clutch case 58 on the side opposite to the brake portion 34, and only the center hole of the slip ring 64 is a screw hole and is screwed to the screw shaft 30. A clutch spring 66 is provided between the outer periphery of the boss 64 a of the slip ring 64 and the inner periphery of the clutch case 58.
Is interposed. One end 66a of the clutch spring 66 is
Notch 5 provided at one place on the inner periphery of clutch case 58
8a.

The end of the screw shaft 30 is a non-threaded portion 70 where no screw is formed, and the outer diameter of the non-screwed shaft 70 is set to the same outer diameter as the threaded portion of the screw shaft 30. You.
The non-screw shaft 70 constitutes positioning means for positioning the clutch case 58 together with the clutch spring 66.

As in the first embodiment, the winding pipe 1
6 is rotated in the winding direction and the clutch case 58 is moved rightward in FIG.
0a, and the brake portion 34 operates to reduce the winding speed. At this time, the clutch case 58 is
If it moves to the rightmost end of FIG. 6 of FIG. 6, it cannot move to the non-screw shaft 70, so that the slip ring 64 cannot rotate and stops there. On the other hand, the clutch case 58 continues
As shown in FIG. 7, one end 66a of the clutch spring 66 pushes the clutch spring 66 in a direction to loosen the clutch spring 66, so that the clutch spring 66 is rotated.
Idles with the clutch case 58. Thus, when the screen 18 is finally completely wound, the clutch case 58 is positioned at the end of the screw shaft 30. Next, when the clutch case 58 rotates in the unwinding direction along with the winding pipe 16, one end 66a of the clutch spring 66 is pressed in a direction to tighten the clutch spring 66, so that the clutch spring 66 is fastened to the slip ring 64, and the clutch case 66 is closed. 5
8 and the slip ring 64 move leftward on the screw shaft 30 while integrally rotating.

In this manner, each time the screen 18 is completely wound around the winding pipe 16, the clutch case 58
Can be calibrated.

In each of the above embodiments, an oil brake is used as a rotary brake. However, the present invention is not limited to this, and a centrifugal brake may be used.
As the centrifugal brake, for example, the one described in Japanese Utility Model Laid-Open Publication No. 59-24893 can be used. When the clutch case is engaged with the brake pin, the first centrifugal brake rotates in the same direction as the winding pipe. A second rotating body that rotates in a different direction or at a different speed from the drum;
A centrifugal member attached to the rotating body of the
And a braking member provided between the rotating members.

The first brake 22 may be configured to always operate, but may be configured to operate only at the time of winding by providing a clutch mechanism.
As in 6, a centrifugal brake can be used.

[0042]

As described above, claims 1 to 5
According to the described invention, the clutch case moves on the screw shaft and engages with the brake portion, so that the screen winding speed can be surely reduced at the final stage of screen winding, and the impact noise caused by the weight bar is reduced. And impact force can be reduced. The positioning means performs the axial positioning of the clutch case when the screen is completely wound, so that the screen is automatically wound completely without fine adjustment of the axial position of the clutch case. Thus, the position of the clutch case is calibrated, and the final position of the screen winding can be reliably determined. In addition, the positioning of the clutch case can be easily adjusted during the installation work or when the screen is replaced and reinstalled.

[Brief description of the drawings]

FIG. 1 is a front view showing a roll screen according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the roll screen of FIG.

3 is an arrow view of the clutch case of FIG. 2 as viewed from the direction of arrow 3. FIG.

FIG. 4 is a view corresponding to FIG. 2, showing the operation of the roll screen of FIG. 1;

FIG. 5 shows a second embodiment of the clutch case.
FIG.

FIG. 6 shows a second embodiment of the clutch case.
FIG.

FIG. 7 is a sectional view of a main part showing a roll screen according to a third embodiment of the present invention.

FIG. 8 is a view of the clutch case of FIG. 7 as viewed from the direction of arrow 8;

[Explanation of symbols]

 Reference Signs List 10 roll screen 14 side plate 16 winding pipe 18 screen 20 spring 26 second brake (brake device) 30 screw shaft 31 non-screw shaft 32 clutch case 34 brake section 38 rotary brake 40 brake case 40a brake pin 56 push spring 58 clutch case 64 Slip ring 66 Clutch spring 70 Non-screw shaft (non-screw part)

Claims (5)

[Claims] 1. A brake device in which a spring is housed inside a take-up pipe rotatably supported by a side plate, and a screen is wound around the take-up pipe by the accumulating force of the spring. In a roll screen in which the take-up speed of the screen is reduced by using a screw device, the brake device is arranged so as to be axially movable and non-rotatable relative to a take-up pipe with a screw shaft fixedly supported by a side plate. A clutch case that moves on the screw shaft with the rotation of the take-up pipe, and a brake unit provided at the end of the screw shaft. When the screen is completely wound, the clutch case A roll screen further provided with positioning means for positioning the winding pipe in the axial direction. 2. A screen winding speed is reduced from before a screen winding final stage, and in a screen winding final stage, a clutch unit is engaged with a brake unit to operate a brake unit, and the screen winding speed is reduced. 2. The roll screen according to claim 1, wherein the speed is further reduced. 3. The positioning means has a non-screw shaft connected to the screw shaft and having no screw formed thereon, and the clutch case moves from the screw shaft to the non-screw shaft immediately before the screen is completely wound. The roll screen according to claim 1 or 2, wherein the roll screen is formed. 4. The roll screen according to claim 3, wherein said positioning means further comprises a push spring for pushing a clutch case on a non-screw shaft to a screw shaft. 5. A non-threaded portion formed at an end of a screw shaft for preventing movement of a clutch case, a slip ring inside the clutch case and screwed to the screw shaft, and a clutch case. 3. The roll screen according to claim 1, further comprising: a clutch spring interposed between the screw case and the clutch spring that causes the clutch case to idle at the end of the screw shaft in the winding direction of the winding pipe.