JPH07233684A - Rolling screen device - Google Patents

Abstract

PURPOSE:To prevent breakage and malfunction by pushing a clutch adapter toward a clutch spring retainer when the clutch adapter and the clutch spring retainer is fastened together by a one-way clutch spring. CONSTITUTION:When a control cord 22a is pulled, a pulley 26 is rotated intermediarily clockwise. At this time, the pulley 26 and a clutch 28 is rotated integrally with each other since a cut-out part 54a and a leg part 60c make contact with each other. Accordingly, the clutch 28 and a clutch adapter 32 are rotated by a designated angle, relative to each other so that an engage part 62 of the clutch adapter 32 and an engage part 64 of the adapter 32 are made into contact with each other. Accordingly, the adapter 32 is coupled to a clutch spring retainer 36 while a pushing force is instantly applied to the adapter 32 in a direction toward the retainer 36. Accordingly, a torque is applied to the adapter 32 in an unwinding direction so that a one-way clutch spring 34 is expanded so as to release the fastening between the adapter 32 and the retainer 36, and accordingly, the rotation of the adapter 32 is allowed. Accordingly, the pulley, the clutch and the adapter are rotated integrally with one another. Thereby it is possible to prevent breakage.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a conventional roll screen device,
For example, the rotation of the pulley is directly transmitted to the winding pipe, and the pulley is continuously rotated by repeatedly pulling the ball chain wound around the pulley to wind the screen and wind it. There is a chain type roll screen device for performing unwinding operation. Also, a clutch mechanism is provided between the pulley and the winding pipe,
A chain-type one-touch winding that activates the clutch mechanism and automatically winds the screen on the winding pipe by keeping the winding side of the ball chain wound around the pulley in a pulled state. There is also a take-up roll screen device.

[0003]

However, the conventional roll screen device described above has the following problems. That is, in the case of the chain type roll screen device, since the winding and unwinding of the screen are performed by repeating the pulling operation of the ball chain, there is a problem that the operation is troublesome. Further, in the case of the chain type one-touch winding roll screen device, there is a problem that the ball chain must be kept in a pulled state while the screen is being wound. As a solution to the above problem, the applicant has previously filed Japanese Patent Application No. 5
No. 193052. In the roll screen device shown therein, a winding pipe is provided with a clutch device capable of applying the elastic force of the winding spring. The clutch device includes a fixed shaft fixed to the side plate, a pipe receiver rotatably supported by the fixed shaft and integrally rotatably connected to the winding pipe, and a relative rotation of the fixed shaft. The fitted pulley, the rotary cylinder that can rotate relative to the pulley by a predetermined angle and can be connected to rotate integrally, and the rotary cylinder and the pipe receiver can be connected and connected by the relative rotation of the pulley and the rotary cylinder. The ball that can be released and one end is connected to the rotary cylinder, and when the rotary cylinder rotates in the direction to unwind the screen, it is expanded and the fastening between the rotary cylinder and the fixed shaft is released,
When the rotary cylinder rotates in the direction of winding the screen, the one-way clutch spring is tightened to fasten the rotary cylinder and the fixed shaft,
Have. However, the above-mentioned Japanese Patent Application No. 5-193052
In the one shown in No. 1, if you try to stop the screen while winding the screen, the one-way clutch spring that was in the released state during the winding of the screen is momentarily fixed when the operation to stop the screen is performed. Since the shaft is tightened, the inertial force of the rotary cylinder concentrates on one end of the one-way clutch spring connected to the rotary cylinder. Therefore, there is a problem that one end of the one-way clutch spring may be damaged. Also, Japanese Patent Laid-Open No. 14939/1992 discloses a device which reduces a load applied to one end of a one-way clutch spring.
There is one disclosed in Japanese Patent No. 0. That is, the clutch device provided at one end of the winding shaft includes a spring shaft supported by a support bracket, a first spring drum and a second spring drum rotatably supported adjacent to the spring shaft, It has a clutch spring provided over the first spring drum and the second spring drum, and a clutch arm whose intermediate portion is rotatably supported by the first spring drum and which is rotatable by rotation of a pulley. The clutch spring has one end locked to the first spring drum and the other end locked to the tip of the clutch arm. When the first spring drum rotates in the screen unwinding direction of the winding shaft via the pulley, the clutch spring tightens the first and second spring drums, so that the first and second spring drums rotate integrally. , When the pulley rotates in the opposite direction and the tip of the clutch arm rotates in the predetermined direction, the clutch spring and the second
The frictional force between the second spring drum and the spring drum is reduced, and the second spring drum can idle in the clutch spring.
However, even in the one disclosed in JP-A-4-149390, when a large torque is momentarily applied when the clutch spring tightens the first and second spring drums, the diameter of the clutch spring is reduced to a predetermined amount or more. , The clutch spring bites into the joint between the first spring drum and the second spring drum,
There is a problem that malfunction may occur. The present invention is intended to solve such a problem.

[0004]

SUMMARY OF THE INVENTION According to the present invention, when the clutch adapter and the clutch spring receiver are fastened by a one-way clutch spring, the clutch adapter is pushed out in the clutch spring receiving direction. To solve. That is, in the roll screen device of the present invention, both ends of the winding pipe (16) are rotatably supported by the side plates (14) at both ends of the set frame (12), and the winding pipe (16) includes: Screen (1
One end side of 8) is connected so that it can be wound and unwound, and a winding spring that constantly applies a force to rotate the screen (18) in the winding direction is provided to the winding pipe (16). ), The operation code (2
2) A clutch device (24) capable of transmitting the rotation of a pulley (26) operable by means of 2) and capable of exerting an elastic force of a winding spring is provided. In the clutch device (24), , A fixed shaft (4) which is non-rotatably attached to the side plate (14).
4), a pipe receiver (40) rotatably supported by a fixed shaft (44) and integrally rotatably connected to the winding pipe (16), and a fixed shaft (44).
The pulley (2
6) and a pulley (26) that can rotate relative to each other by a predetermined angle and that can be connected to the clutch (2).
8), an engagement element (30) capable of connecting and disconnecting the clutch (28) and the pipe receiver (40) by relative rotation of the pulley (26) and the clutch (28), and the clutch (28). And can rotate relative to a predetermined angle,
A clutch adapter (3 that can be coupled so as to rotate integrally while being pushed out in the axial direction opposite to the clutch (28)
2), a clutch spring receiver (36) which is non-rotatably supported by a fixed shaft (44), and a clutch adapter (32) of which is relatively rotatably fitted, and a clutch adapter (32). And a one-way clutch spring (34) capable of engaging and disengaging the clutch spring receiver (36) depending on the direction of rotation. The numbers in parentheses indicate the corresponding members in the examples described later.

[0005]

When the screen is lowered, the screen lowering operation side of the operation cord is pulled downward and the pulley is rotated in the screen unwinding direction. As a result, the pulley and the clutch rotate integrally, so that the clutch rotates relative to the clutch adapter relative to the clutch adapter by a predetermined angle, and then instantaneously applies a pushing force in the clutch spring receiving direction to the clutch adapter to rotate integrally with the clutch adapter. Connected to. For this reason, since a rotational force in the screen winding direction is applied to the clutch adapter, the one-way clutch spring is expanded and the clutch adapter and the clutch spring receiver are disengaged, allowing the clutch adapter to rotate. As a result, the pulley, the clutch and the clutch adapter rotate together. Further, since the engagement element is located at a position where the clutch and the pipe receiver can be connected to each other, the pipe receiver also rotates together with the winding pipe together with the pulley. Therefore, the take-up pipe unwinds the screen. To stop the screen from descending, remove your hand from the operation code and stop the pulley rotation. As a result, the take-up pipe tries to rotate in the screen take-up direction together with the pipe receiver due to the elastic force of the take-up spring. Also, since the pipe receiver and the clutch are connected by the engaging element, the clutch also tries to rotate together with the pipe receiver, but the clutch is connected after rotating relative to the clutch adapter by a predetermined angle, and the clutch is connected to the clutch adapter. The pushing force in the spring receiving direction and the rotating force in the screen winding direction are instantly applied. As a result, the one-way clutch spring is tightened without biting into the joint between the clutch adapter and the clutch spring receiver, and the clutch adapter and the clutch spring receiver are fastened, so that the rotation of the clutch adapter is restrained. Therefore, since the rotation of the clutch is also restricted, the rotation of the pipe receiver connected to the clutch is also restricted. As a result, the rotation of the winding pipe is stopped. To raise the screen, the screen raising operation side of the operation cord is pulled downward, the pulley is slightly rotated in the screen winding direction, and the pulley and the clutch are relatively rotated by a predetermined angle. As a result, the engagement element moves to a position where the coupling between the clutch and the pipe receiver is released. For this reason, the pipe receiver becomes rotatable, so even if you stop pulling down the operation cord and release your hand.
The winding pipe rotates by the elastic force of the winding spring to wind the screen. When the screen is stopped in the middle of ascending, the screen lowering operation side of the operation cord is pulled downward, the pulley is slightly rotated in the screen unwinding direction, and the pulley and the clutch are relatively rotated by a predetermined angle. As a result, the engagement element moves to a position that connects the clutch and the pipe receiver. Therefore, the clutch tries to rotate in the screen winding direction together with the pipe receiver, but at this time, since the pushing force in the clutch spring receiving direction and the rotating force in the screen winding direction are instantaneously applied to the clutch adapter, The one-way clutch spring is tightened without digging into the joint between the clutch adapter and the clutch spring receiver, and the clutch adapter is fastened to the clutch spring receiver. As a result, the rotation of the clutch is restrained, so that the pipe receiver also becomes unrotatable, and the rotation of the winding pipe is stopped.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the entire roll screen device 10 embodying the present invention. Side plates 14 are provided at both ends of a set frame 12 for attaching the roll screen device 10 to a window frame. The winding pipe 16 is rotatably supported by the side plate 14.
One end of a screen 18 is connected to the winding pipe 16 so that the screen 18 can be wound and unwound. The winding pipe 16 is
A winding spring (not shown) constantly applies a force in the winding direction of the screen 18. The other end of the screen 18 is connected to the weight bar 20. A wheel cover 46 is provided at the left end of the winding pipe 16 in FIG.
Is provided, from which an operation chain (operation code) 22 that can drive the winding pipe 16 to rotate is derived. The operation chain 22 is an endless ball chain.

FIG. 2 is an exploded perspective view of the clutch device 24 arranged at the left end of the winding pipe 16 in FIG. The clutch device 24 includes a fixed shaft 44, a pulley 26, a clutch 28, an engagement element 30, a clutch adapter 32, a one-way clutch spring 34, a clutch spring receiver 36, a first E ring 38, and a pipe receiver 40. And the second E ring 4
2 and. The fixed shaft 44 projects toward the inside of the take-up pipe 16 on the support piece 14b of the side plate 14 that is composed of a connecting piece 14a that can be connected to the set frame 12 and a support piece 14b that supports the take-up pipe 16. Let it be fixed. The fixed shaft 44 includes a mounting portion 44a mounted on the side plate 14 and a shaft portion 44b protruding from the mounting portion 44a. Shaft 44b
Is a circular cross section from the mounting portion 44a to a predetermined position in the axial direction, and the other parts are cut at a 180 ° circular cross section from the center of the circle along a straight line of a predetermined dimension to alternate a curved surface and a flat surface on the outer circumference. Each of them has a circular shape and a non-circular shape. Further, in the shaft portion 44b, a groove portion 43 into which the first E ring 38 and the second E ring 42 can be elastically fitted at two positions which are spaced apart by a predetermined distance in the axial direction of the cross section partially circular portion partially non-circular portion. And 45 are formed. The wheel cover 4 is attached to the mounting portion 44a of the fixed shaft 44.
6 is rotatably fitted. In addition, the fixed shaft 44
The mounting portion 44a has a notch 44 at the upper portion in FIG.
c is formed. A lever 48 is arranged in the cutout portion 44c. Bottom of lever 48 and notch 4
Between the bottom surface of 4c, the lever 48 is always attached to the mounting portion 44a.
Is provided with a spring 50 that presses in the direction of the outer diameter of the. As a result, the lever 48 has the shoulder portion 4 formed on it.
A part of the wheel cover 46 is constantly pressed upward by 8a in FIG. The wheel cover 46 is restrained from rotating by being pressed by the shoulder portion 48a of the lever 48. The pulley 26 has a large-diameter portion 26a formed with an unevenness around the entire circumference of which the balls of the operation chain 22 can be hooked,
It is composed of a small diameter portion 26b having a smaller radial dimension than the large diameter portion 26a protruding from the large diameter portion 26a in the axial direction. Grooves 52 are formed in the small-diameter portion 26b at three locations at predetermined intervals in the circumferential direction. In addition, the large diameter portion 26a has a small diameter portion 26b from both ends of the predetermined groove portion 52, respectively.
Two notches 54a and 54b are formed along the outer periphery of the. The size of each of the cutouts 54a and 54b is a size including the portion of the small diameter portion 26b where the groove 52 is not formed and the groove 52 adjacent to both sides of the predetermined groove 52, respectively. . Pulley 26
A through hole 56 is rotatably fitted in the circular section of the shaft portion 44b of the fixed shaft 44 at the center of rotation. Holes 58 into which the ball-shaped engagement elements 30 can be inserted are formed in the clutch 28 at three positions facing the three groove portions 52 of the pulley 26. From between the predetermined two hole portions 58, the leg portion 6 guided by the groove portion 54b of the pulley 26 and movably fitted.
0a projects in the axial direction. Further, from both ends of the other hole 58, leg portions 60b and 60c, which are guided by the cutout portion 54a of the pulley 26 and are movably fitted, respectively project in the axial direction. On the surface of the clutch 28 opposite to the pulley 26 side, there are formed taper-shaped engaging portions 62 having taper-shaped axially protruding surfaces at two circumferentially symmetrical positions. The clutch adapter 32 is the clutch 2
8, a large-diameter portion 32a having the same outer diameter as the outer diameter, and a large-diameter portion 3
And a small diameter portion 32b having a smaller radial dimension than 2a. On the surface of the large diameter portion 32a facing the clutch 28, the clutch 28 is provided at two circumferentially symmetrical positions.
A tapered engagement portion 64 similar to the above is formed. The clutch 28 and the clutch adapter 32 are rotatable relative to each other by a predetermined angle, and are configured to integrally rotate after the respective tapered engagement portions 62 and 64 contact each other. On the surface (the surface on the back side in the drawing) opposite to the surface (the surface on the front side in the drawing) on which the tapered engagement portion 64 of the large-diameter portion 32a is formed, a one-way clutch spring 34 described later is provided. Claw 6
An insertion hole 66 into which 8 can be fitted is formed. In this embodiment, the one-way clutch spring 34 is a coil spring, and a pawl portion 68 is formed by bending one end of the one-way clutch spring 34 in the axial direction. The clutch spring receiver 36 is
The outer diameter of the small diameter portion 36a, the medium diameter portion 36b,
Shoulders 70 and 72 are formed in the order of the large-diameter portion 36c, and the shape changes in three stages. At the center of the clutch spring receiver 36, a through hole 7 having a shape that fits axially in the axial portion 44b of the shaft portion 44b of the shaft portion 44b in a partial circular shape and a non-circular shape.
4 are formed. The pipe receiver 40 is formed in a tubular shape having an internal space composed of a large-diameter housing portion 40b and a small-diameter through hole 76, and the through hole 76 is provided at the tip of the shaft portion 44b of the fixed shaft 44. It is adapted to be rotatably fitted to a partly circular and partially non-circular cross section. The accommodating portion 40b of the pipe receiver 40 forms a shoulder portion 80 at a predetermined axial position from the opening end portion of the accommodating portion 40b, and has a slightly smaller radial dimension. Further, a spline hole-shaped engaging portion 82 is formed over the entire circumference on the inner peripheral surface of the pipe receiver 40 from the opening end portion to the shoulder portion 80. A flange 84 is formed at the open end of the pipe receiver 40. On the outer peripheral surface of the pipe receiver 40, a spline shaft-shaped engaging portion 78 is formed over the entire circumference.

FIG. 3 shows a sectional view of the assembled clutch device 24. The side plate 14 is a connecting piece 1 of this.
4 a is connected to the set frame 12. The pulley cover 46 and the lever 48 are assembled to the fixed shaft 44 of the side plate 14 as described above. Pulley 26
The through hole 56 is fitted in the circular section of the shaft portion 44b of the fixed shaft 44 so as to be relatively rotatable. The operation chain 22 is wound around the outer circumference of the large diameter portion 26a of the pulley 26. The clutch spring receiver 36 has a small diameter portion 36 a adjacent to the pulley 26 and has a through hole 74.
Is non-rotatably fitted to a part of the shaft portion 44b of the fixed shaft 44 which is circular and partially non-circular. The small diameter portion 36a of the clutch spring receiver 36 has a clutch 2 on the front end side thereof.
8 is relatively rotatably fitted, and a clutch adapter 32 is relatively rotatably fitted adjacent to the clutch 28. The clutch 28 and the clutch adapter 32 are
As shown in FIG. 4, the tapered protrusions 62 and 64 are arranged adjacent to each other, and one tapered protrusion and the other portion in which the tapered protrusion is not formed are in contact with each other. There is. Since the clutch 28 and the clutch adapter 32 are in contact with the pulley 26 at the end of the clutch 28 and in contact with the shoulder 70 of the clutch spring receiver 36 at the end of the clutch adapter 32 on the side of the small diameter portion 32b, they are mutually axial. Movement in the direction is restricted. A one-way clutch spring 34 is fitted over the small diameter portion 32b of the clutch adapter 32 and the middle diameter portion 36b of the clutch spring receiver 36. Pawl 6 of one-way clutch spring 34
8 is fitted in the insertion hole 66 of the clutch adapter 32. The one-way clutch spring 34 has one end in contact with the large-diameter portion 32a of the clutch adapter 32 and the other end in contact with the shoulder 72 of the clutch spring receiver 36, so that the one-way clutch spring 34 moves in the axial direction. Have been detained. In the one-way clutch spring 34, the clutch adapter 32 has the screen 1
When the clutch adapter 32 is rotated in the unwinding direction, the clutch adapter 32 and the clutch spring receiver 36 are unfastened, and the clutch adapter 32 is rotated in the direction in which the screen 18 is wound. Fasten the receiver 36. Clutch spring receiver 36
The first E-ring 38 so as to come into contact with the end surface of the large diameter portion 36c of
Is elastically fitted in the groove 43 of the fixed shaft 44. As a result, the movement of the clutch spring receiver 36 in the axial direction is restricted. The pipe receiver 40 accommodates the clutch 28, the clutch adapter 32, the clutch spring receiver 36, the one-way clutch spring 34, and the first E ring 38 in the housing portion 40b of the pipe receiver 40, and the through hole 76 of the pipe receiver 40 has the fixed shaft 44.
The shaft portion 44b is fitted in a partially circular and partially non-circular cross section so as to be relatively rotatable. The second E ring 42 is elastically fitted into the groove portion 45 of the fixed shaft 44 in contact with the end surface of the pipe receiver 40 on the right side in FIG. 3. Pipe receiver 40
3 has its flange 84 in contact with the large-diameter portion 26a of the pulley 26 to restrain its movement in the left direction in FIG. 3, and the movement in the right direction in FIG. End face is 2E
It is restrained by being in contact with the ring 42.
The pipe receiver 40, as shown in FIG.
The protrusions 86 formed on the inner diameter portion of the winding pipe 16 are fitted to each other and are connected to the winding pipe 16 so as to be integrally rotatable. The take-up pipe 16 has a brim 8 at its side end.
4, and the movement in the left direction in FIG. 3 is restricted.

Next, the operation of this embodiment will be described.
First, when lowering the screen 18 from the stopped state shown in FIG. 5, the lowering operation side 22a of the operation chain 22 is pulled downward. This causes the pulley 26 to rotate clockwise in FIG. At this time, with respect to the pulley 26 and the clutch 28, the lower end of the cutout portion 54b of the pulley 26 in FIG. 6 and the leg portion 60a of the clutch 28 are in contact with each other, and the cutout portion 54a of the pulley 26 is illustrated. 6. Since the middle upper end portion and the leg portion 60c of the clutch 28 are in contact with each other, they try to rotate integrally. As a result, the clutch 28 rotates relative to the clutch adapter 32 by a predetermined angle, and when the tapered engagement portion 62 and the tapered engagement portion 64 of the clutch adapter 32 come into contact with each other, as indicated by an arrow in FIG. To
The clutch adapter 32 is coupled so as to rotate integrally with the clutch adapter 32 while instantaneously applying a pushing force toward the clutch spring receiver 36. For this reason, since a rotational force in the unwinding direction of the screen 18 is applied to the clutch adapter 32, the one-way clutch spring 34 is expanded and the fastening between the clutch adapter 32 and the clutch spring receiver 36 is released, and the clutch adapter 32 of the clutch adapter 32 is released. Rotation is allowed. As a result, the pulley 26, the clutch 28, and the clutch adapter 32 rotate together. Further, since the pulley 26 and the clutch 28 are connected so as to rotate integrally, the respective engagement elements 30 are located on the outer peripheral surface of the pulley 26, and a part of each of them is projected from the outer diameter portion of the clutch 28. , The state of being in contact with the engaging portion 82 of the pipe receiver 40 is maintained. Therefore, the pipe receiver 40
Also rotates together with the winding pipe 16 together with the pulley 26. Therefore, the winding pipe 16 unwinds the screen 18.

Next, when stopping the descent of the screen 18, the hand is released from the descent operation side 22a, and the pulley 26
To stop the rotation of. As a result, the winding pipe 16 tends to rotate in the winding direction of the screen 18 (that is, the counterclockwise direction in FIG. 5) together with the pipe receiver 40 by the elastic force of the winding spring. Further, since the engagement element 30 is in contact with the engagement portion 82 of the pipe receiver 40, the clutch 28
Also tries to rotate integrally with the pipe receiver 40, but the clutch 28 rotates relative to the clutch adapter 32 by a predetermined angle, and then the tapered engagement portion 62 and the clutch adapter 3 of the clutch 28.
Since the second taper engaging portion 64 comes into contact with the clutch adapter 32, as shown by an arrow in FIG. 4, the pushing force in the direction of the clutch spring receiver 36 and the rotational force in the direction of winding the screen 18 are instantaneously applied to the clutch adapter 32. Will be added to. For this reason, the one-way clutch spring 34 is tightened without biting into the joint between the clutch adapter 32 and the clutch spring receiver 36, and the clutch adapter 32 and the clutch spring receiver 36 are fastened. As a result, the clutch adapter 3
The rotation of 2 is restricted. Therefore, since the rotation of the clutch 28 is also restricted, the rotation of the pipe receiver 40 in which the engaging portion 82 is in contact with the engagement element 30 is also restricted. As a result, the rotation of the winding pipe 16 is stopped in the state shown in FIGS. 5 and 6.

Next, when raising the screen 18, the raising operation side 22b is pulled downward from the stopped state shown in FIG. 5, and the pulley 26 is slightly rotated counterclockwise in FIG. As a result, in the pulley 26, as shown in FIG. 8, the leg portion 60a comes into contact with the upper end portion of the notch portion 54b, and the leg portion 60b is placed at the lower end portion of the notch portion 54a. The clutch 28 rotates relative to the contact position. Thus, as shown in FIG. 7, the pulley 26
The groove portion 52 moves to a position facing the hole portion 58 of the clutch 28. Therefore, the pulley 28 causes the clutch 28
Since the engaging element 30 pushed out in the direction of the outer diameter moves to the direction of the inner diameter of the clutch 28 and is inserted into the groove 52, the connection between the clutch 28 and the pipe receiver 40 is released. As a result, the pipe receiver 40 becomes rotatable, so that the winding pipe 16 rotates counterclockwise in FIG. 7 due to the elastic force of the winding spring even if the pulling down of the raising operation side 22b is stopped and the hand is released. Then, the screen 18 is wound up.

Next, when the screen 18 is stopped in the middle of ascending, the descending operation side 22a is pulled downward and the pulley 26 is slightly rotated clockwise in FIG. This allows
As shown in FIG. 6, in the pulley 26, the leg portion 60a contacts the lower end portion of the cutout portion 54b in FIG. 6 and the leg portion 60a contacts the upper end portion of the cutout portion 54a in FIG. Part 60
The clutch 28 rotates relative to the position where b comes into contact.
As a result, the engaging element 30 located in the groove portion 52 of the pulley 26 is pushed up toward the outer peripheral surface by the inclined surface of the groove portion 52 and moves in the hole portion 58 of the clutch 28 toward the outer diameter portion, as shown in FIG. As shown, it is arranged at a position where it can come into contact with the engaging portion 82 of the pipe receiver 40. On the other hand, the pipe receiver 40 rotates counterclockwise in FIG. 5 together with the take-up pipe 16 due to the elastic force of the take-up spring. The receiver 40 and the clutch 28 are integrally rotatably connected. As a result, the clutch 28 tends to rotate counterclockwise in FIG. 5 together with the pipe receiver 40. At this time, the clutch adapter 32 pushes the clutch spring 32 toward the clutch spring 36 and the screen 18 winding direction. Since the rotational force is applied instantly, the one-way clutch spring 34 is tightened without biting into the joint between the clutch adapter 32 and the clutch spring receiver 36, and the clutch adapter 3
2 and the clutch spring receiver 36 are fastened. This allows
Since the rotation of the clutch 28 is restricted, the pipe receiver 40
Also becomes a non-rotatable state, and the rotation of the winding pipe 16 is stopped.

[0013]

According to the present invention, one end is connected to a clutch adapter which can be rotated relative to the clutch by a predetermined angle and can be integrally rotated while being pushed out in the axial direction opposite to the clutch. At the same time, a one-way clutch spring is provided so as to be arranged across the clutch adapter and the clutch spring receiver that fits the clutch adapter so as to be relatively rotatable. As a result, the rotational force in the screen winding direction is transmitted to the clutch adapter through the clutch, and when the one-way clutch spring is tightened, the clutch adapter is pushed axially by the clutch and pressed against the clutch spring receiver. A part of the one-way clutch spring is prevented from biting into the joint between the clutch adapter and the clutch spring receiver. As a result, damage to the one-way clutch spring, the connecting portion between the one-way clutch spring and the clutch adapter, the joint between the clutch adapter and the clutch spring receiver, and malfunction of the clutch device can be prevented.

[Brief description of drawings]

FIG. 1 is an overall view of a roll screen device embodying the present invention.

FIG. 2 is an exploded perspective view of a clutch device.

3 is a cross-sectional view near the left end of FIG.

FIG. 4 is a diagram showing an operating state of a clutch device.

5 is a sectional view taken along line 5-5 of FIG.

6 is a sectional view taken along line 6-6 of FIG.

FIG. 7 is a diagram showing a state when the screen of FIG. 5 is wound.

FIG. 8 is a diagram showing a state when the screen of FIG. 6 is wound.

[Explanation of symbols]

 12 set frame 14 side plate 16 winding pipe 18 screen 22 operation chain (operation code) 24 clutch device 26 pulley 28 clutch 32 clutch adapter 34 one-way clutch spring 36 clutch spring bearing 40 pipe bearing 44 fixed shaft

Claims (1)

[Claims] 1. Both ends of a winding pipe (16) are rotatably supported by side plates (14) at both ends of a set frame (12), and the winding pipe (16) includes a screen (18). The one end side is connected so that it can be wound and unwound, and a winding spring that constantly applies a rotating force to the screen (18) in the winding direction is provided on the winding pipe (16). In a roll screen device, which is provided with a clutch device (24) capable of transmitting rotation of a pulley (26) operable by an operation cord (22) and capable of exerting elastic force of a winding spring, The clutch device (24) is rotatably supported by a fixed shaft (44) fixed to the side plate (14) in a non-rotatable manner. A pipe receiver (40) integrally rotatably connected to the take-up pipe (16), the pulley (26) relatively rotatably fitted to a fixed shaft (44), and a pulley. A clutch (28) capable of rotating relative to (26) by a predetermined angle and being coupled so as to rotate integrally, and the clutch (28) and the pipe receiver (40) by the relative rotation of the pulley (26) and the clutch (28). ) And an engaging element (30) capable of connecting and disconnecting with each other and a clutch (28) are rotatable relative to each other by a predetermined angle, and are integrally rotated while being pushed out in an axial direction opposite to the clutch (28). Is fixed to the fixed shaft (44) so that it cannot rotate, and the clutch adapter (32) is fitted in a relatively rotatable manner. A clutch spring receiver (36), and a one-way clutch spring (34) capable of engaging and disengaging the clutch adapter (32) with the clutch spring receiver (36) according to the rotation direction thereof. A roll screen device characterized by the above.