JPH07301067A - Roll screen - Google Patents

Abstract

PURPOSE:To prevent a downward operation of a screen from becoming heavy from an upper limit wind-up position by allowing a nut member to bump against a restriction member and to be coupled with the screws of a bolt shaft firmly when winding up the screen. CONSTITUTION:A wind-up upper limit position setting device is engaged with a bolt shaft laid out concentrically with a wind-up pipe 16 in such a fashion that it may move in the longitudinal direction and connected to the wind-up pipe 16 so that it may be rotated in one piece and provided with a nut member 54 having a magnet and a restricting member 56 which restricts that the nut member 54 may move in the longitudinal direction of the bolt shaft and which is formed with a magnet. The magnet 70 of the nut member 54 and the magnet of the restricting member are laid out so that their opposed sides may be the same polarity.

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 is constituted by a pressing member that presses the braking plate in the direction of the moving piece by elastic force and presses it. To set the screen winding upper limit position, first,
By removing the rotary cylinder from the bracket, rotating the moving piece with fingers etc., moving it on the stationary bolt, pressing it against the braking plate as much as possible, and installing it in the rotary cylinder of the screen wound to the desired position. Done. 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, so that the elastic force of the pressure contact body causes the braking plate to press the moving piece in the opposite direction to the above, and 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. The screen winding upper limit position setting device disclosed in Japanese Utility Model Publication No. 3-16400 discloses a fixed shaft for rotatably supporting a roll pipe, a bolt provided on an extension shaft portion of the fixed shaft, and a nut for the bolt. A device comprising a movable top that rotates with a roll pipe to move on a bolt and a brake that brakes the movable top, the brake being a brake drum provided in an extension of a fixed shaft, and a brake drum. It is composed of a coil spring that is freely wound around and has one end locked to the extension shaft portion of the fixed shaft and the other end that is free, and an engaging portion provided on the coil spring side of the movable top. The joint portion engages with the other end of the coil spring to fasten the coil spring to the brake drum, thereby stopping the rotation of the roll pipe. 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]

According to the present invention, the nut member has a magnet, and the restricting member is formed of a magnet, and the magnet of the nut member and the magnet of the restricting member have the same facing surface. The above problem is solved by arranging the electrodes so as to form the poles. That is, the roll screen of the present invention has a take-up pipe (16) rotatably supported at both ends by side plates (14) provided at both ends of the set frame (12) and one end side of the take-up pipe (16). A screen (18) that is connected so that it can be wound and unwound, a winding spring that constantly applies a force for rotating the winding pipe (16) in the winding direction of the screen (18), and the winding pipe (16). ) To screen (1
8) A winding upper limit position setting device capable of setting the winding upper limit position, wherein the winding upper limit position setting device is a bolt shaft arranged concentrically with the winding pipe (16). A nut member (54) having a magnet (70), 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 therewith. ) And a nut member (54) and a restricting member (56) formed of a magnet capable of restricting movement of the nut member (54) in the axial direction of the bolt shaft (52). The magnet (70) and the magnet of the regulating member (56) are characterized in that they are arranged so that the sides facing each other have the same pole. At the screw hole forming portion of the nut member (54), the magnet (7
0) may not be formed. Further, one or both of the magnet (70) of the nut member (54) and the magnet of the regulating member (56) may be an electromagnet. The code inside the brackets is
The corresponding members of the examples described below are shown.

[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, as the nut member moves on the bolt shaft in the direction of the restricting member, the repulsive force between the magnet of the nut member and the magnet of the restricting member increases, so the braking force of the nut member gradually increases, The speed at which the member moves on the bolt axis gradually decreases. As a result, when the nut member moves to the position closest to the regulating member, the braking force of the nut member becomes the strongest, so that a slight gap is generated between the nut member and the regulating member due to the repulsive force between the magnet of the nut member and the magnet of the regulating member. It stops in the state of forming, and further rotation is restrained. Therefore, the winding pipe is restrained from rotating. As a result, the raising of the screen stops at the set position. In this way, the braking force of the nut member gradually increases as it approaches the regulating member, and the braking force becomes stronger at the position where the nut member and the regulating member are closest to each other. It is possible to stop in a state where a slight gap is formed between the restriction member and the repulsive force.
As a result, it is possible to prevent the nut member from being firmly coupled to the thread of the bolt shaft. Further, when the nut member has a structure in which the magnet is not formed in the screw hole forming portion of the nut member, the strength of the screw hole can be increased as compared with the case where the magnet is subjected to the screw hole processing. Further, when one or both of the magnet of the nut member and the magnet of the regulating member is an electromagnet, the degree of freedom in setting the magnitude of the repulsive force can be increased.

[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 magnet regulating member 56 is fixed to the other end of the bolt shaft 52. The restriction member 56 is a nut member 54 described later.
Can be regulated. The bolt shaft 52 is provided with a nut member 54 so as to move in the axial direction of the bolt shaft 52 by its rotation.
Are intermeshed. As shown in FIG. 3, the nut member 54 has three protrusions 16 a, 16 b formed on the inner diameter portion of the winding pipe 16 at predetermined intervals in the circumferential direction.
And 16c, and three groove portions 54a, 54b and 54 formed in the outer diameter portion of the groove portion 16c at predetermined intervals in the circumferential direction.
c and are fitted to each other and connected so as to be integrally rotatable. The magnet 70 is attached to the nut member 54 so as to cover a portion other than the screw hole forming portion on the side facing the restricting member 56. The magnets 70 and the magnets of the regulating member 56 are arranged so that the sides facing each other have the same pole (for example, N poles). Through hole 2 of clutch drum 28
A spring controller 58 is detachably provided on the side plate 14 side of 8h. As shown in FIG. 4, the spring controller 58 is formed with protrusions 58a and 58b protruding in the outer diameter direction at symmetrical positions of the outer diameter portion thereof. 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. Is the protrusion 5
8c is formed so as to project in parallel with each other in the axial direction.
The projecting portion 58c can be relatively rotatably fitted into a 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, the drum receiving plate 26,
Clutch drum 28, clutch spring 32, main shaft 34, bolt shaft 52, nut member 54, magnet 70, regulating member 56.
The spring controller 58 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 so that the clutch drum 2 is not moved.
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 is rotated by the bolt shaft 52 so that the magnet 70 of the nut member 54 rotates.
And the bolt shaft 52 against the repulsive force of the magnet of the regulating member 56.
It moves in the direction of the regulating member 56 on the axis of. The repulsive force between the magnet 70 of the nut member 54 and the magnet of the restriction member 56 increases as the nut member 54 approaches the restriction member 56.
Therefore, when the nut member 54 moves to the position closest to the restricting member 56, the restricting member 5 is moved by the repulsive force between the magnet 70 and the magnet of the restricting member 56 as shown in FIG.
The movement is stopped in the state where a slight gap is formed between the bolt shaft 52 and
Begins to rotate together with. Therefore, the elastic force of the winding spring is overcome and the winding pipe 16 begins to rotate integrally with the nut member 54, so that the screen 18 is unwound. The screen 18 is lowered to the position shown in FIG. 6, and the spring controller 58 is moved to the clutch drum 28.
Remove from. As a result, the winding pipe 16 tries to rotate in the winding direction of the screen 18 due to the elastic force of the winding spring, so that the nut member 54 also tries to rotate in the winding direction of the screen 18. However, the nut member 54
When this is rotated in the winding direction of the screen 18, the
Although it will move in the middle right direction, it has already moved to the position closest to the restricting member 56, and since the clutch spring 32 is not pressed by the protrusion 58d of the spring controller 58, the clutch spring 32 expands and the clutch cap 22 extends. Since the clutch drum 28, the main shaft 34, and the bolt shaft 52 are engaged with each other and the rotation of the bolt shaft 52 is restricted, the nut member 5
4 cannot rotate. Therefore, the winding pipe 1
The rotation of 6 is also restrained. As a result, the winding upper limit position of the screen 18 is set to the position shown in FIG.
In this way, by inserting the spring controller 58 into the clutch drum 28 and rotating it, the screen 18
Since it is possible to set the winding upper limit position of, the setting work of the winding upper limit position of the screen 18 is easy. 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,
The nut member 54 rotates so that the bolt shaft 5
2 Move up in the left direction in FIG. As a result, the screen 18 is unwound from the winding pipe 16. After lowering the screen 18 to the lowest position shown in FIG. 7 and releasing the force of pulling the weight bar 20 downward,
The take-up pipe 16 tends to rotate in the take-up direction of the screen 18 due to the elastic force of the take-up spring. For this reason,
Since a rotational force in the winding direction of the screen 18 is applied to the grooved drum 40 via the stopper case 42, 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. 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, so that the clutch spring 32 engaged with the clutch cap 22 prevents the clutch drum 28 from rotating. Be detained. As a result, the rotation of the main shaft 34 is also restrained, so that the grooved drum 40
The rotation of the take-up pipe 16 is restrained via the stopper case 42. 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 unwinding direction of the screen 18 together with the winding pipe 16. As a result, the balls 48 are guided by the grooves 50 to move, and the stopper case 42 and the grooved drum 40 are moved.
Will be released. Therefore, the winding pipe 16 and the stopper case 42 rotate counterclockwise in FIG. 3 due to the elastic force of the winding spring. 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. As a result, the rotation of the bolt shaft 52 is also restrained, so that the nut member 54 that rotates integrally with the winding pipe 16 has the magnet 70.
And the bolt shaft 52 against the repulsive force of the magnet of the regulating member 56.
Move up in the right direction in FIG. At this time, the repulsive force between the magnet 70 and the magnet of the regulating member 56 increases as the nut member 54 moves rightward in FIG. 1 on the bolt shaft 52, so that the braking force of the nut member 54 gradually increases. As the strength increases, the speed at which the nut member 54 moves on the bolt shaft 52 gradually decreases. Thus, as shown in FIG. 5, when the nut member 54 moves to the position closest to the restricting member 56, the braking force of the nut member 54 becomes the strongest, so that the repulsive force between the magnet 70 and the magnet of the restricting member 56 causes the nut member 54 to move. It stops with a slight gap formed between the restriction member 56 and further rotation 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 braking force becomes stronger at the position where the nut member 54 and the regulating member 56 are closest to each other. By the repulsive force of the magnet of the restriction member 56 and the restriction member 56, it is possible to stop with a slight gap formed between the restriction member 56 and the restriction member 56. As a result, the nut member 54 will not be firmly joined to the thread of the bolt shaft 52.

By simply attaching a ring-shaped magnet to the nut member of the existing roll screen upper limit position setting device, forming the regulating member with the magnet, and arranging the magnets so that the opposing sides of both magnets have the same polarity. As such, existing roll screens can be very easily modified to the specifications of the present application.

Further, in the above embodiment, the magnet 70 of the nut member 54 and the magnet of the regulating member 56 are arranged such that their facing sides are N poles, but the present invention is not limited to this. It may be between the poles. Further, in the above-described embodiment, the magnet 70 is provided in addition to the screw hole forming portion of the nut member 54.
Is attached, but this is for increasing the strength of the screw hole because the screw hole is easily broken when the magnet material is subjected to the screw hole processing. However, if it is not necessary to consider the strength of the screw hole so much, the entire nut member may be formed of a magnet. In addition, the magnet 70 of the nut member 54
Also, one or both of the magnets of the regulating member 56 may be electromagnets.

[0012]

According to the present invention, the nut member has a magnet, and the restricting member is formed of a magnet, and the magnet of the nut member and the magnet of the restricting member have the same polarity on the opposite side. To arrange. 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, since the repulsive force between the magnet of the nut member and the magnet of the restricting member increases (that is, the braking force of the nut member gradually increases) as the nut member approaches the restricting member, The speed of movement on the bolt shaft gradually decreases. Therefore, when the nut member moves to the position closest to the regulating member,
Since the braking force is the strongest, it is possible to form a slight gap between the magnet of the nut member and the magnet of the restricting member and to stop the magnet due to the repulsive force. This allows
Since it is possible to prevent the nut member from being firmly coupled to the screw thread of the bolt shaft, 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 diagram showing a state in which a nut member and a regulating member are closest to 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.

[Explanation of symbols]

 12 set frame 14 side plate 16 winding pipe 18 screen 52 bolt shaft 54 nut member 56 regulating member 70 magnet

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). The bolt shaft (52) is engaged 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 therewith. 0) having a nut member (54), and a nut member (54) capable of restricting movement of the nut member (54) in the axial direction of the bolt shaft (52), and a restricting member (56) formed of a magnet. The magnet (70) of the nut member (54) and the regulating member (56)
The roll screen is characterized in that the magnets are arranged so that the sides facing each other have the same poles. 2. The roll screen according to claim 1, wherein the magnet (70) is not formed in a screw hole forming portion of the nut member (54). 3. The magnet (7) of the nut member (54).
The roll screen according to claim 1 or 2, wherein one or both of the magnets 0) and the restriction member (56) are electromagnets.