JPH07301066A - Roll screen - Google Patents

Abstract

PURPOSE:To lower a screen smoothly by laying out a bolt shaft concentrically with a wind-up pipe and connecting a nut member to the winding-up pipe so as to rotate in one piece and restricting the nut member so that is may not move in the longitudinal direction of the bolt shaft and permitting a coil spring to act in such a fashion that its pushing force may be increased in the direction in which the nut member separates from a restrict member. CONSTITUTION:In the case when a screen 18 is set to an upper limit wind-up position, it is arranged that a projected part 58c of a spring controller 58 is caught in a penetration hole 28h of a clutch drum 28 while a projected part 58d is caught in between the ends 32 end 32d of a clutch spring 32 in a state in which the screen 18 is thoroughly wound up around a wind-up pipe 16 and they are rotated together. A nut member 54 is transferred to a position nearest to a regulation member 56 and then the spring controller 58 is removed from the clutch drum 8. After the screen 18 is set to the upper limit wind-up position, the screen 18 is lowered to the lowest drop position. When a downward drawing force is canceled at that time, the rotary motion of a main shaft 34 is subjected to restrictions so that the rotary motion of the winding-up pipe 16 is restricted, thereby halting the movement of the screen 18.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventional winding screen upper limit position setting devices include those disclosed in Japanese Utility Model Publication No. 58-21919 and Japanese Utility Model Publication No. 3-16400.
That is, the winding upper limit position setting device for a screen disclosed in Japanese Utility Model Publication No. 58-21919 includes a stationary bolt arranged and fixed on the rotation axis of the winding barrel of the screen.
A movable piece that is engaged with the stationary bolt and is connected to the take-up cylinder, is movable and rotatable in the axial direction of the stationary bolt, a braking plate that is attached to the stationary bolt and presses against the movable piece, and a stationary bolt. Is arranged so as to overlap with the braking plate on the axis of, and the pressing plate elastically presses the braking plate in the direction of the moving top to make pressure contact. To set the upper limit position for winding the screen, first remove the rotary cylinder from the bracket, rotate the moving piece with your fingers, etc., move it on the stationary bolt, press it fully against the braking plate, and set it to the desired position. It is carried out by mounting it in the rotating cylinder of the screen wound up to. As a result, when the screen that has been pulled down is wound up to a desired position, the moving piece moving on the stationary bolt collides with the braking plate. Therefore, the brake plate moves against the elastic force of the pressure contact body by being pressed by the moving piece that is about to move further on the stationary bolt. As a result, the pressure contact body is compressed, and the elastic force of the pressure contact body causes the braking plate to press the moving piece in the opposite direction to the above, so that the movement of the moving piece is stopped. Therefore, the winding of the screen is stopped because the rotation of the winding cylinder is stopped. Also, actual fairness 3
Japanese Patent Application Laid-Open No. 16400 discloses a screen winding upper limit position setting device in which a fixed shaft for rotatably supporting a roll pipe, a bolt provided on an extension shaft portion of the fixed shaft, and a roll pipe attached to the bolt as a nut. It is a device that consists of a movable top that rotates with the bolt and moves on the bolt, and a brake that brakes the movable top.The brake is a brake drum provided in an extension of the fixed shaft, and can be tightened and loosened on the brake drum. It consists of a coil spring that is wound and has one end locked to the extension shaft of the fixed shaft and the other end that is free, and an engaging portion that is provided on the coil spring side of the movable top. The rotation of the roll pipe is stopped by engaging with the other end of the coil spring and fastening the coil spring to the brake drum. To set the upper limit position for winding the screen, first remove the roll pipe from the bracket,
On the roll pipe with the screen wound up to a desired position, with the moving top moved to a position where the engaging portion of the moving top engages with the other end of the coil spring to fix the coil spring on the brake drum. It is done by mounting. As a result, even if the roll pipe rapidly rotates and the movable top moves while rapidly rotating on the bolt, when the screen is wound up to the desired position and stopped, the movable top is shocked by the coil spring. Can be absorbed and stopped.

[0003]

However, the conventional winding upper limit position setting device for a screen described above has the following problems. That is, in the one disclosed in Japanese Utility Model Publication No. 58-21919, when the moving piece moves to the winding upper limit position, the impact force is somewhat absorbed by the elastic force of the pressure contact body, but suddenly due to these. Since the braking force is applied, a considerably large impact force is generated. Therefore, the moving piece is firmly connected to the thread of the stationary bolt, and there is a problem that the descending operation becomes heavy when descending the screen from the winding upper limit position.
In addition, what is disclosed in Japanese Utility Model Publication No. 3-16400 is
The moving top is frictionally engaged with the inner surface of the coil spring to absorb the impact force, but when the impact force is particularly large, the moving top is inserted into the inner diameter of the coil spring while expanding the coil spring by its conical surface. To go. Therefore, there is a problem that the coil spring gets over the maximum diameter portion of the conical surface of the movable top to firmly fasten the movable top, and the lowering operation becomes heavy when lowering the screen from the winding upper limit position. . The present invention is to solve the above problems.

[0004]

SUMMARY OF THE INVENTION According to the present invention, the above-mentioned problems are solved by providing the nut member with a coil spring that increases the pushing force in the direction of separating the nut member from the restricting member as the nut member approaches the restricting member. Solve. That is, the roll screen of the present invention has a winding pipe (16) whose both ends are rotatably supported by side plates (14) provided at both ends of the set frame (12).
A screen (18) whose one end side is connected to the winding pipe (16) so that the winding pipe can be wound and unwound; and a force for constantly rotating the winding pipe (16) in the winding direction of the screen (18). Winding spring and winding pipe (1
And a winding upper limit position setting device capable of setting a winding upper limit position of the screen (18) to the screen 6), wherein the winding upper limit position setting device is concentric with the winding pipe (16). A bolt shaft (52) arranged,
The nut member (54), which is meshed with the bolt shaft (52) so as to be movable in the axial direction and is connected to the winding pipe (16) so as to rotate integrally, and the nut member (54) are A restriction member (56) capable of restricting axial movement of (52) and a nut member (54).
Becomes closer to the restricting member (56), the nut member (5
4) The coil spring (70) that acts so as to increase the pushing force in the direction of separating the regulating member (56) from the regulating member (56). The coil spring (70)
Can also be formed so that the pitch changes from coarse to dense from the end portion on the nut member (54) side to the end portion on the regulating member (56) side.
Further, the coil spring (70) is formed such that the pitch changes from coarse to dense to coarse from the end portion on the nut member (54) side to the end portion on the regulating member (56) side. It can also be set. The reference numerals in parentheses indicate the corresponding members in the embodiments described later.

[0005]

When the screen is raised, the take-up pipe rotates in the screen take-up direction by the elastic force of the take-up spring, the nut member also rotates integrally with the take-up pipe, and moves on the bolt shaft toward the regulating member. To go. At this time, since the degree of compression of the coil spring increases as the nut member moves on the bolt shaft in the direction of the restricting member, the braking force of the nut member gradually increases and the nut member moves on the bolt shaft. The speed gradually decreases. As a result, when the nut member moves to the position closest to the regulating member, it makes light contact with the regulating member, and further rotation is restricted. Therefore, the rotation of the take-up pipe is restricted. As a result, the raising of the screen stops at the set position. As described above, the braking force of the nut member gradually increases as the nut member approaches the restricting member, and becomes the strongest at the position where the nut member comes into contact with the restricting member. Therefore, the nut member can contact the restricting member without colliding. This prevents the nut member from being firmly connected to the thread of the bolt shaft. When using a coil spring whose pitch is changed from coarse to dense, or from coarse to dense and then to coarse, the braking force of the nut member at the beginning of screen winding is reduced as much as possible, and when the screen is stopped. Since the large braking force acts on the nut member, the rising speed does not slow down so much and the collision at the time of stop can be reduced.

[0006]

EXAMPLE FIG. 1 shows a roll screen 1 embodying the present invention.
A part of 0 is shown. Side plates 1 are provided on both ends of a set frame 12 for attaching the roll screen 10 to the window frame.
4 is provided (the side plate at the right end in FIG. 1 is not shown). A winding pipe 16 is rotatably supported on the side plate 14. Winding pipe 16
As shown in FIG. 3, one end side of a screen 18 is connected by a screen stop plate 17 so that the screen 18 can be wound and unwound. The take-up pipe 16 is constantly applied with a force in a direction for taking up the screen 18 by a take-up spring (not shown). The other end of the screen 18 is connected to the weight bar 20. As shown in FIG. 6, a pull cord 72 hangs down at the center of the weight bar 20 in the longitudinal direction, and a knob 74 is connected to the lower end of the pull cord 72. The clutch cap 22 is attached to the side plate 14 at the left end in FIG.
It is fixed to the opening end of this with a connecting portion 22d formed so as to project in the outer diameter direction. Clutch cap 22
Is a cylindrical large-diameter portion 22a formed from an opening end of the connecting portion 22d side to a predetermined position in the axial direction, and a large-diameter portion 22a.
A cylindrical small-diameter portion 22b having a smaller radial dimension, a side wall 22c connecting the large-diameter portion 22a and the small-diameter portion 22b,
It consists of Connection part 2 of clutch cap 22
As shown in FIG. 2, notches 22e are formed in 2d at intervals of 90 degrees in the circumferential direction. The drum receiving plate 26 having a substantially cylindrical shape is provided with 90
Projecting pieces 26a are formed at regular intervals. The protruding piece 26a of the drum receiving plate 26 is immovably fitted in the notch 22e of the clutch cap 22. The drum receiving plate 26 has a circular space portion 14 a formed in the side plate 14 by protruding the other end side of which the edge portion is bent in the inner diameter direction from the left end surface of the side plate 14 in FIG. 1. It is fitted. Clutch cap 2
A clutch drum 28 is arranged inside the unit 2. The clutch drum 28 includes a tip diameter portion 28f and a tip diameter portion 28f.
It is formed by forming a shoulder portion 28g from f, and a large diameter portion 28a having a diameter larger than the tip diameter portion 28f and a large diameter portion 28a and a shoulder portion 28d are formed. Smaller diameter than the middle diameter portion 28b and the middle diameter portion 28b to the shoulder portion 28
e is formed, and a small diameter portion 28c having a smaller diameter than the middle diameter portion 28b is formed. The clutch drum 28 is rotatably fitted to the edge portion on the other end side of the drum receiving plate 26 with its tip diameter portion 28f. The clutch drum 28 is formed with a through hole 28h having a cross section that is partially square and partially circular, which penetrates the axis of the clutch drum 28.
The through hole 28h has a circular cross section arranged on the side plate 14 side. As shown in FIG. 2, the clutch drum 28 has a notch 28i at a predetermined position in the circumferential direction from the tip diameter portion 28f to the small diameter portion 28c.
Are formed. The clutch drum 28 has a medium-diameter portion 28b arranged axially at the same position as the large-diameter portion 22a of the clutch cap 22, and a small-diameter portion 28 thereof.
c is fitted to the small diameter portion 22b of the clutch cap 22 so as to be relatively rotatable. Also, the clutch drum 28
The shoulder 28e of the side wall 2 of the clutch cap 22.
1c is restrained from moving to the right in FIG. 1, and the shoulder 28g is in contact with the drum receiving plate 26 to restrain from moving to the left in FIG. A clutch spring 32 is provided between the large diameter portion 22a of the clutch cap 22 and the medium diameter portion 28b of the clutch drum 28. As shown in FIG. 2, both ends 32a and 32b of the clutch spring 32 are bent in the inner diameter direction and arranged in the cutout portion 28i of the clutch drum 28. The clutch spring 32 is provided on the shoulder portion 2 of the clutch drum 28.
It is sandwiched between 8d and the side wall 22c of the clutch cap 22 to restrain movement in the axial direction. The clutch spring 32 can be fastened to and released from the inner peripheral surface of the clutch cap 22. Through hole 28h of clutch drum 28
In the rectangular section of the cross section, one end 34 of the rectangular section of the spindle 34 is
a is rotatable integrally with this and is fitted so as not to be relatively movable in the axial direction. A stopper device 38 is provided on the circular section of the main shaft 34. The stopper device 38 includes a grooved drum 40 and a stopper case 42.
A stopper case cap 44, a clutch spring 46, and a ball 48. The grooved drum 40 is relatively rotatably fitted to the outer diameter portion of the main shaft 34, and a groove 40a for guiding the movement of the ball 48 is formed on the outer peripheral surface thereof. The stopper case 42 is relatively rotatably fitted to the outer diameter portion of the grooved drum 40 with the ball 48 interposed therebetween, and the outer diameter portion of the stopper case 42 is fixed so as to rotate integrally with the winding pipe 16. . The grooved drum 40 and the stopper case 42 are integrally rotatably connected depending on the position of the ball 48 which is guided and moved in the groove 40a by the relative rotation of the grooved drum 40 and the stopper case 42.
The connection may be released. Stopper case cap 44
Is provided at one end of the stopper case 42, and connects the stopper case 42 to the main shaft 34 so as to be relatively rotatable. The clutch spring 46 has a grooved drum 40 at one end.
Is provided on the outer diameter portion of the main shaft 34, and when the grooved drum 40 rotates in the unwinding direction of the screen 18, the grooved drum 40 is expanded to release the fastening between the grooved drum 40 and the main shaft 34. When the grooved drum 40 rotates in the winding direction of the screen 18, the grooved drum 40 is fastened to fasten the grooved drum 40 and the main shaft 34. One end of a bolt shaft 52 is coaxially connected to the other end of the main shaft 34 so as to be integrally rotatable.
A nut member 54 is engaged with the bolt shaft 52 so as to move in the axial direction of the bolt shaft 52 when it is rotated. The nut member 54, as shown in FIG.
Three protrusions 16a, 16b and 16c are formed on the inner diameter portion of the inner peripheral portion 6 at predetermined intervals in the circumferential direction, and three protrusions 16a, 16b and 16c are formed on the outer diameter portion of the inner peripheral portion at predetermined intervals in the circumferential direction. The grooves 54a, 54b and 54c are fitted to each other,
They are connected so that they can rotate together. A restricting member 56 that restricts the movement of the nut member 54 is provided at the other end of the bolt shaft 52. On the opposite sides of the nut member 54 and the regulating member 56, projecting portions 54a and 56a each having a smaller radial dimension than the radial dimension of the outer diameter portion are formed so as to be able to contact each other and project in the axial direction. . Between the nut member 54 and the regulating member 56, these protrusions 54a are provided.
Both ends are fitted to the outer diameter portions of 56 and 56a so as to be rotatable relative to each other, and the coil spring 70 is provided in the inner diameter portion of the bolt spring 52 so as to penetrate therethrough. The coil spring 70 is in a steady state (that is, a state in which it is not compressed and expanded) when the nut member 54 and the restricting member 56 are at the farthest positions, and the nut member 54 and the restricting member 56 are closest to each other. When in the position, it is set to be in the most compressed state. Further, the coil spring 70 is formed with a constant pitch over its entire length. A spring controller 58 is provided on the side of the through hole 28h of the clutch drum 28 on the side plate 14 side.
Is detachably installed. Spring controller 58
As shown in FIG. 4, projections 58a and 58b projecting in the outer diameter direction are formed at symmetric positions of the outer diameter portion of the member. Further, the spring controller 58 is formed with a protrusion 58c having a circular cross section in the axial center thereof so as to protrude in the axial direction, and a protrusion 58d having a substantially fan-shaped cross section at a position radially spaced from the protrusion 58c. Are formed so as to project in parallel with the projecting portion 58c in the axial direction. Protruding part 5
8c can be relatively rotatably fitted into the circular cross section of the through hole 28h of the clutch drum 28. Further, the protrusion 58d can be inserted between the ends 32a and 32b of the clutch spring 32 so as to be relatively rotatable by a predetermined angle. The clutch cap 22, drum receiving plate 26, clutch drum 28, clutch spring 32, main shaft 34, bolt shaft 5
2, the nut member 54, the regulating member 56, the coil spring 70, and the spring controller 58 constitute a winding upper limit position setting device.

Next, a method of setting the winding upper limit position of the screen 18 will be described. First, in a state in which the screen 18 is completely wound around the winding pipe 16, the protrusion 58c of the spring controller 58 is in the through hole 28h of the clutch drum 28, and the protrusion 58d is the end 3 of the clutch spring 32.
The protrusions 58a and 58b of the spring controller 58 are respectively inserted between 2a and 32b, and they are rotated in the arrow direction (unwinding direction of the screen 18) in FIG. As a result, the protrusion 58d of the spring controller 58 rotates in the clockwise direction in FIG. 2 (the arrow direction in FIG. 2) to come into contact with the end portion 32a of the clutch spring 32, and the end portion 32a.
Is pressed clockwise in FIG. Therefore, the clutch spring 32 is contracted, so that the clutch spring 32 and the clutch cap 22 are disengaged from each other, and the clutch spring 32 becomes rotatable. As a result, the end portion 32a of the clutch spring 32 is pressed by the protrusion 58d and the end portion 32a of the clutch spring 32 is moved to the clutch drum 2.
When the end of the notch 28i of No. 8 is contacted, the clutch spring 3
2. The clutch drum 28 and the main shaft 34 rotate integrally. Therefore, the bolt shaft 52 rotates integrally with the main shaft 34, but the elastic force of the winding spring causes the winding pipe 16 to rotate.
Does not rotate in the unwinding direction of the screen 18, the rotation of the nut member 54 is restricted. As a result, the nut member 54 causes the coil spring 70 to rotate due to the rotation of the bolt shaft 52.
While the coil spring 70 is being compressed against the elastic force of, the bolt shaft 52 is moved in the direction of the regulating member 56 on the shaft. The nut member 54, as shown in FIG.
These protrusions 5 move to the position closest to
Since 4a and 56a come into contact with each other and cannot move any further, they start rotating integrally with the bolt shaft 52. Therefore, the elasticity of the winding spring is overcome and the winding pipe 1
6 starts to rotate integrally with the nut member 54, so that the screen 18 is unwound. After lowering the screen 18 to the position shown in FIG. 6, the spring controller 58 is removed from the clutch drum 28. This allows
Since the winding pipe 16 tries to rotate in the winding direction of the screen 18 by the elastic force of the winding spring, the nut member 54 also tries to rotate in the winding direction of the screen 18. However, the nut member 54 is
When it rotates in the winding direction, it moves to the right in FIG. 1, but it is already in contact with the restricting member 56, and the clutch spring 32 has the protrusion 58 of the spring controller 58.
Since it is not pressed by d, it spreads and the clutch cap 2
Since the clutch drum 28, the main shaft 34, and the bolt shaft 52 are fastened to each other, the nut member 54 cannot rotate. Therefore, the rotation of the winding pipe 16 is also restricted. This allows screen 1
The winding upper limit position of 8 is set to the position shown in FIG. As described above, since the upper limit position of winding the screen 18 can be set only by inserting the spring controller 58 into the clutch drum 28 and rotating the same, it is easy to set the upper limit position of winding the screen 18. Further, fine adjustment of the set position can be easily performed. Although the upper limit position for winding the screen 18 is set to the position shown in FIG. 6 in the above embodiment, the present invention is not limited to this and can be set to a desired position.

When the screen 18 is to be lowered after setting the winding upper limit position of the screen 18, the knob 74 is held and pulled down. This allows the pull cord 72
Since the weight bar 20 is pulled down via the winding bar 16, the winding pipe 16 rotates counterclockwise in FIG. 4 (direction of arrow in FIG. 4). As a result, the winding pipe 16 rotates the nut member 54 clockwise in FIG. 3 and rotates the stopper case 42 clockwise in FIG. By the rotation of the stopper case 42, the stopper case 42 and the grooved drum 40 are fastened via the ball 48, and the grooved drum 40 also rotates in the screen 18 unwinding direction, but the grooved drum 40 unwinds the screen 18 unwinding. When rotated in the direction,
The clutch spring 46 is expanded and the grooved drum 4
Since the fastening between 0 and the main shaft 34 is released, the main shaft 34 does not rotate. Therefore, the bolt shaft 52 also does not rotate,
As the nut member 54 rotates, the nut member 54 moves leftward in FIG. 1 on the bolt shaft 52 while extending the coil spring 70. As a result, the screen 18 is unwound from the winding pipe 16. The screen 18 is shown in FIG.
Lower the weight bar 20 to the lowest position shown in.
When the pulling force is released, the winding pipe 16 tries to rotate in the winding direction of the screen 18 by the elastic force of the winding spring. Therefore, a rotational force in the winding direction of the screen 18 is applied to the grooved drum 40 via the stopper case 42, so that the clutch spring 46 is closed and the grooved drum 40 and the main shaft 34 are fastened. As a result, the main shaft 34 rotates counterclockwise in FIG. 2, so that the clutch drum 28 also rotates counterclockwise in FIG. 2. However, the clutch drum 28 rotates a predetermined angle and then the end of the cutout portion 28i is rotated. The end portion 32a of the clutch spring 32 is contacted and the end portion 32a is pressed counterclockwise in FIG. Since the pressing force applied to the clutch spring 32 is a force in the direction of pushing the clutch spring 32 and engaging it with the clutch cap 22, the clutch spring 32 engaged with the clutch cap 22 causes the clutch drum 28 to rotate.
Rotation is restricted. As a result, the rotation of the main shaft 34 is also restrained, so that the grooved drum 40 and the stopper case 42 are
The winding of the take-up pipe 16 is restrained from rotating. This causes the screen 18 to stop. In the above embodiment, the case where the screen 18 is lowered to the lowest position has been described. However, when the screen 18 is lowered to a desired position, the screen 18 is stopped in the same manner as above.

Next, when raising the screen 18, the knob 74 is held and pulled down slightly.
Thereby, the weight bar 20 is pulled through the pull cord 72.
Is slightly lowered downward, so that the stopper case 42 rotates slightly in the screen unwinding direction together with the winding pipe 16. As a result, the ball 4 is guided by the groove 40a.
8 moves, and the fastening between the stopper case 42 and the grooved drum 40 is released. Therefore, the take-up pipe 16 and the stopper case 42 are moved by the elastic force of the take-up spring as shown in FIG.
Rotate counterclockwise. On the other hand, the rotation of the main drum 34 is restrained because the rotation of the clutch drum 28 is restrained by the clutch spring 32 fastened to the clutch cap 22 as described above. This allows
Since the rotation of the bolt shaft 52 is also constrained, the nut member 54 that rotates integrally with the winding pipe 16 has a coil spring 7
While gradually compressing the coil spring 70 against the elastic force of 0, the bolt shaft 52 moves rightward in FIG.
At this time, since the degree of compression of the coil spring 70 increases as the nut member 54 moves on the bolt shaft 52 in the right direction in FIG. 1, the braking force of the nut member 54 gradually increases, and the nut member 54 increases. Moves on the bolt shaft 52 gradually decreases. As a result, the nut member 54, as shown in FIG.
When it is moved to the position closest to, the braking force thereof is the strongest and the moving speed thereof is the slowest, so that the protruding portion 54a and the protruding portion 56a of the restricting member 56 are in light contact with each other, and further rotation is required. Is restrained. Therefore, the winding pipe 16 is restricted from rotating. As a result, the raising of the screen 18 is stopped at the position shown in FIG. The position at which the screen 18 is stopped is the winding upper limit position of the screen 18 set previously. As described above, the braking force of the nut member 54 gradually increases as it approaches the regulating member 56, and the protruding portion 5 of the nut member 54 increases.
4a and the protruding portion 56a of the regulation member 56 come into contact with each other at the position where the braking force is strongest, and the moving speed on the bolt shaft 52 becomes the slowest. it can. As a result, the nut member 54 will not be firmly joined to the thread of the bolt shaft 52.

In the above embodiment, the coil spring 70 having a constant pitch over the entire length is used, but the present invention is not limited to this, and the pitch may be set from coarse to dense or from coarse to dense as shown in FIG. It is also possible to use the coil spring 80 which is changed to coarse after that. As a result, the braking force of the nut member 54 at the beginning of winding the screen 18 is minimized and the nut member 54 is stopped when the screen 18 is stopped.
Since a large braking force can be applied to the vehicle, the ascending speed does not become too slow and the collision at the time of stopping can be reduced. In the above embodiment, the nut member 5
Although the coil spring 70 is provided between the No. 4 and the regulating member 56,
The present invention is not limited to this. For example, at a position adjacent to the side opposite to the nut member side of the regulating member, a protruding piece protruding inward from the inner peripheral surface of the winding pipe is formed, and the nut member and the protruding piece are formed. The nut member may be pushed in a direction away from the regulating member by providing a coil spring between them. Further, according to the present invention, the existing upper limit position setting device for the roll screen is provided with the nut member 54 as the nut member 54 approaches the restricting member 56.
Since it is only necessary to provide the coil spring 70 that acts so as to increase the pushing force in the direction away from, it is possible to easily apply the present invention to an existing roll screen.

[0011]

According to the present invention, the coil spring is provided on the nut member so that the force for pushing the nut member away from the restriction member gradually increases as the nut member approaches the restriction member. As a result, when the screen is raised, the take-up pipe rotates in the screen take-up direction by the elastic force of the take-up spring, and the nut member also rotates together with the take-up pipe and moves on the bolt shaft toward the regulating member. However, as the nut member approaches the regulating member, the force of pushing the nut member away from the regulating member by the coil spring gradually increases (that is, the braking force of the nut member gradually increases). The speed at which the nut member moves on the bolt shaft gradually decreases. Therefore, since the moving speed of the nut member becomes the slowest when the nut member moves to the position closest to the restricting member, the nut member can come into contact with the restricting member without colliding. As a result, it is possible to prevent the nut member from being firmly coupled to the thread of the bolt shaft, and therefore the descent operation of the screen from the winding upper limit position can be performed lightly.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a roll screen embodying the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a side view of a roll screen.

FIG. 5 is a view showing a state where a nut member and a regulating member are in contact with each other.

FIG. 6 is a view showing a state in which the screen is wound up to a winding upper limit position.

FIG. 7 is a diagram showing a state in which the screen is unwound to the lowest position.

FIG. 8 is a diagram showing another embodiment.

[Explanation of Codes] 12 Set Frame 14 Side Plate 16 Winding Pipe 18 Screen 52 Bolt Shaft 54 Nut Member 56 Controlling Member 70 Coil Spring

Claims (3)

[Claims] 1. A take-up pipe (16) whose both ends are rotatably supported by side plates (14) provided at both ends of a set frame (12), and one end side of which is taken up and taken up by the take-up pipe (16). A screen (18) connected to the winding pipe (18), a winding spring which constantly applies a force for rotating the winding pipe (16) in the winding direction of the screen (18), and a screen for the winding pipe (16). (18) A roll-up upper limit position setting device capable of setting the roll-up upper limit position, wherein the roll-up upper limit position setting device is arranged concentrically with the roll-up pipe (16). A nut portion that is engaged with the bolt shaft (52) such that the bolt shaft (52) can move in the axial direction, and that is connected to the winding pipe (16) so as to rotate integrally therewith. (54) and a restricting member (56) capable of restricting movement of the nut member (54) in the axial direction of the bolt shaft (52), and as the nut member (54) approaches the restricting member (56), A roll screen, comprising: a coil spring (70) that acts so as to increase the force of pushing the nut member (54) away from the regulating member (56). 2. The coil spring (70) is arranged such that an end portion of the coil spring (70) on the nut member (54) side extends from the regulating member (56).
The roll screen according to claim 1, wherein the roll screen is formed so that the pitch changes from coarse to dense toward the end portion on the side. 3. The regulating member (56) of the coil spring (70) extends from the end of the coil spring (70) on the nut member (54) side.
The roll screen according to claim 1, wherein the roll screen is formed so that the pitch changes from coarse to dense and then to coarse toward the end portion on the side.