JPH0613825B2 - Roll blind elevating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a roll blind lifting device.

(Prior Art) Conventionally, a torsion coil spring is disposed in a winding shaft that winds a screen as one type of elevating device for elevating a roller blind, and when the screen is pulled down, the torsion coil spring stores energy to When pulling up, the power is used to automatically pull up. In such an elevating device, for example, a structure described in Japanese Patent Application Laid-Open No. 60-188591 has been proposed in order to suspend and support the screen at a desired position against the stored force of the torsion coil spring. That is, it is possible to select a state in which the cylindrical cam having a built-in spring clutch prevents rotation of the take-up shaft in the screen pulling direction by the stored force of the torsion coil spring and a state in which the rotation is permitted.

(Problems to be Solved by the Invention) However, in the above-described lifting device, in addition to the operating force for storing the torsion coil spring when pulling down the screen, the cylindrical cam resists the biasing force of the spring clutch. There is a problem that a large operating force is required because an operating force for rotating the is required.

Configuration of the Invention (Means for Solving Problems) In order to solve the above problems, the present invention is directed to a screen 5
Both ends of a winding shaft 4 for suspending and supporting the same are rotatably supported by a mounting bracket 3a, and the winding shaft is biased in a screen pulling direction by a biasing means. On the other hand, a brake drum 13 which is fixed so as not to rotate is provided, a guide groove 14 is provided in the circumferential direction of the outer peripheral surface of the brake drum 13, and a sliding body 16 that slides in the guide groove by rotation of the winding shaft is provided. A pull-down groove 17 on which the slide body slides when the winding shaft is rotated in the screen pulling direction, and a pull-up groove 19 on which the slide body slides when the winding shaft is rotated in the screen pulling direction.
And a stop groove 21 for preventing rotation of the winding shaft in the screen pulling direction, and when the winding shaft is rotated in the screen pulling direction from the state of rotating the winding shaft in the screen pulling direction, When the pull-down groove and the stop groove are connected so as to guide from the pull-down groove to the stop groove, and the take-up shaft is rotated in the screen pull-down direction from the state in which the slide body is located in the stop groove in the stop groove. A first return groove 22 for guiding the sliding body is connected, and the winding shaft is rotated in the screen pulling direction from a state in which the sliding body is located in the first returning groove. When the sliding member is guided to the pulling groove, the winding shaft is rotated in the screen pulling direction from the state where the sliding member is located in the first return groove. It The second return groove 23, which guides the slide body when the slide body is guided, is connected to the second return groove, and the second return groove is a slide body located in the second return groove when the winding shaft is rotated in the pulling down direction. It is configured to be guided to the pull-down groove and to guide the sliding body located in the second return groove to the pull-up groove when the winding shaft is rotated in the pull-up direction.

(Operation) By the above-mentioned means, the winding shaft 4 is rotated in the screen pull-down direction and the sliding body 16 is positioned in the pull-down groove 17, so that the winding shaft 4 is rotated in the screen pull-up direction by the urging force of the urging means. Then, the sliding body 16 is guided from the pull-down groove 17 to the stop groove 21. Therefore, the rotation of the winding shaft 4 in the screen pulling direction due to the urging force of the urging means is prevented.

When the winding shaft 4 is rotated in the screen pull-down direction from the state where the slide body 16 is located in the stop groove 21, the slide body 16 is guided to the first return groove 22 and the biasing means is applied from that state. When the winding shaft 4 is rotated in the screen pulling direction by the force, the sliding body 16 is guided to the pulling groove 19,
The winding shaft 4 becomes rotatable in the screen pulling direction.

From the state where the sliding body 16 is located in the first return groove 22,
When the winding shaft 4 is rotated in the screen pulling down direction, the sliding body 16 is guided by the pulling down groove 17 through the second return groove 23, and the winding shaft 4 is rotatable in the screen pulling down direction.

(Embodiment) An embodiment embodying the present invention will be described below with reference to the drawings. As shown in FIG. 2, a roller blind 1 has mounting brackets 3 on both sides of a frame body 2 fixed to an upper frame such as a window.
a and 3b are screwed, and their mounting brackets 3a and 3b
A take-up shaft 4 is rotatably supported between b, and a cloth screen 5 is suspended from and supported by the take-up shaft 4. As shown in FIG. 1, a torsion coil spring 6 as an urging means is disposed in the winding shaft 4, and one end of the torsion coil spring 6 is a drive plug 7.
Is fixed to the take-up shaft 4 via, and the other end (not shown) is fixed to the mounting bracket 3b via a connecting member.
Then, when the screen 5 is pulled down, the torsion coil spring 6 is energized, and the energizing force of the torsion coil spring 6 energizes the screen 5.
Is being raised.

On one side of the winding shaft, a clutch device 8 for suspending and supporting the screen 5 at a desired position against the stored force of the torsion coil spring 6 and a governor device 9 for appropriately suppressing the pulling speed of the screen 5 are provided. Is provided. The structure will be described in detail. The bracket shaft 10 is screwed to the lower portion of the mounting bracket 3a.
At 0, a shaft portion 11 that projects laterally in a cylindrical shape is formed. A base end portion of a substantially cylindrical clutch cap 12 is rotatably supported on the outer periphery of the shaft portion 11,
One end of the winding shaft 4 is fitted and fixed to the outer peripheral surface of the clutch cap 12.

The base end portion of the brake drum 13 is fitted and fixed to the inner circumference of the shaft portion 11 of the bracket shaft 10, and the outer peripheral surface of the brake drum 13 positioned inside the clutch cap 13 with a slight gap is a semi-section. Circular guide groove 1
4 are formed. A slide groove 15 having a semicircular cross section is also formed in the longitudinal direction on the inner peripheral surface of the clutch cap 12, and a clutch ball 16 as a sliding body is disposed between the slide groove 15 and the guide groove 14. Has been done. When the clutch cap 12 rotates, the clutch ball 16 moves in the guide groove 14 while moving in the slide groove 15 in the lateral direction of FIG.

The guide groove 14 will be described in the expanded state shown in FIG. 4. In the figure, when the screen 5 is lowered, the clutch ball 16 moves in the direction of arrow A, and when the screen 5 is pulled up, the clutch ball 16 moves in the direction of arrow B. Move to. A pull-down groove 17 is provided on the tip side of the brake drum 13.
Are formed in an annular shape in the circumferential direction, and in the pull-down groove 17, there are provided first bending portions 18 that bend toward the base end side of the brake drum at two equal intervals, that is, 180 with respect to the center of the brake drum 13.
It is formed at intervals of degrees. A pull-up groove 19 is formed in a circumferential annular shape on the base end side of the brake drum 13, and in the pull-up groove 19, second curved portions 20 that bend toward the brake drum front end side are formed at two equal intervals. . The curved portions 18 and 20 are positioned so as to be offset from each other in the circumferential direction.

A stop groove 21 is formed from the first curved portion 18 in the screen pulling direction, and an end point portion 21a thereof is obliquely bent toward the base end side of the brake drum 13.

The first return groove 22 connected to the end point portion 21a extends slightly in the screen pull-down direction and then extends obliquely to the pull-up groove 19 side,
From that position, it extends in the screen pulling direction and communicates with the second curved portion 20 of the pulling groove 19. The first return groove 22 communicates with the second return groove 23 from a position that extends obliquely to the pull-up groove 19 side, and the second return groove 23 communicates with the pull-down groove 17.

A planetary drum 24 and a governor drum 25 are fitted to the tip of the clutch cap 12. Both drums 24, 25
A support shaft 26 is passed through the center of the support shaft 26, one end of the support shaft 26 is supported and fixed to the brake drum 13, and the other end thereof is supported and fixed to the governor drum 25. A governor shaft 27 is rotatably supported by the support shaft 26, and a sun gear 28 is formed on the outer peripheral surface of the governor shaft 27 in the clutch cap 12.

Around the sun gear 28, four planet gears 30 are rotatably supported by the planet drum 24 via a gear shaft 29, and the planet gears 30 mesh with the sun gear 28.
The tip of the brake drum 13 is located around each planetary gear 30, internal teeth 31 are formed on the inner peripheral surface thereof, and the planetary gears 30 mesh with the internal teeth 31. Therefore, when the clutch cap 12 rotates, the planetary gears 30 rotate while meshing with the internal teeth 31 and the sun gear 28, so that the governor shaft 27 reversely rotates at a higher rotational speed than the clutch cap 12 via the sun gear 28. . The number of teeth of each gear 28, 30 is set so that the governor shaft 27 rotates in the reverse direction at a rotational speed four times the rotational speed of the clutch cap 12.

The governor shaft 27 is circumferentially extended in the governor drum 25 to form a disc portion 32. As shown in FIG. 5, a side face of the disc portion 32 is provided with a first guide shaft 33 on the center line. Two guide shafts 34 are provided at equal intervals from the center, and two second guide shafts 34 are provided at equal intervals from the center on a center line orthogonal to the center line. The distance between the first guide shafts 33 is slightly larger than the distance between the second guide shafts 34.

A pair of governor weights 35 are supported on each of the guide shafts 33 and 34 as a set of adjacent guide shafts. That is, the governor weight 35 is formed in a substantially crescent shape, and a first elongated hole 36 that curves along the outer peripheral surface is formed at one end thereof, and the first elongated hole 36 is formed.
A sliding portion 37 is projected on the outer peripheral surface in the vicinity. A second elongated hole 38 is formed at the other end of the governor weight 35. The second elongated hole 38 has a substantially triangular shape that widens toward the other end of the governor weight 35.
Is closest to the outer peripheral surface 39, and the wide portion 38b is formed in a direction away from the outer peripheral surface 39 and the top portion 38a. The first guide shaft 33 is movably inserted into the first elongated hole 36, and the second guide shaft 34 is movably inserted into the second elongated hole 38. Therefore,
When the governor shaft 27 is rotated in the arrow C direction in FIG. 5, that is, in the screen pulling down direction, both guide shafts 33, 34 are rotated.
Moves in the same direction in both slots 36 and 38, so that the governor weight 35 moves so that the second guide shaft 34 is located at the top 38a of the second slot 38 as shown in FIG. . That is, both governor weights 35 move in a direction in which they approach each other due to the inertial force, and the state shown in the same figure is obtained.
Further, when the governor shaft 27 moves in the direction of arrow D, that is, in the screen pulling direction, both guide shafts 33, 34 move in the same direction in both of the long holes 36, 38, so that the second guide as shown in FIG. The shaft 34 moves into the wide portion 38a of the second elongated hole 38, and the governor weight 35 is allowed to rotate outward with the first guide shaft 33 as a fulcrum. Then, in this state, when the rotation speed of the governor shaft 27 increases and the centrifugal force acting on the governor weight 35 increases, as shown in FIG.
7 is in sliding contact with the inner peripheral surface of the governor drum 25.

Next, the operation of the roller blind lifting device configured as described above will be described.

Now, when the screen 5 of this roll blind is pulled down against the biasing force of the torsion coil spring 6, the winding shaft 4
The clutch cap 12 is rotated via. At this time, the clutch ball 16 repeatedly moves in the direction of the arrow A in the pull-down groove 17 shown in FIG. Also, governor drum 2
5, the disc portion 32 of the governor shaft 27 is rotated in the direction of arrow C as shown in FIG. 5, so that the governor weight 35 is provided with the first and second elongated holes 36, 38 as shown in FIG.
Rotate while moving along. That is, since both guide shafts 33 and 34 move in both elongated holes 36 and 38, and especially the second guide shaft 34 moves to the top portion 38a of the second elongated hole 38, the sliding contact portion 37 of the governor weight 35. Moves away from the inner peripheral surface of the governor drum 25. Therefore, when the screen 5 is pulled down, friction does not occur between the governor drum 25 and the governor weight 35, and an operating force sufficient to store the torsion coil spring 9 is sufficient.

When the screen 5 is pulled down to a desired position and the hand is released, the screen 5 is slightly pulled up by the stored force of the torsion coil spring 6 and then its movement is stopped. That is,
In FIG. 4, the clutch ball 16 that has been moving in the pull-down groove 17 in the direction of the arrow A when the screen is pulled down moves backward into the pull-down groove 17, and due to its inertial force, moves from the first curved portion 18 into the stop groove 21. It enters and is locked at the end point 21a. In this state, the rotation of the winding shaft 4 and the clutch cap 12 in the screen pulling direction due to the stored force of the torsion coil spring 6 is blocked by the brake drum 13 via the clutch ball 16, so that the screen 5 is hung at that position. Supported.

When the screen 5 is slightly pulled down from this state, the clutch ball 16 moves from the first return groove 22 into the second return groove 23 due to its inertial force, and when the hand is released in this state, the clutch ball 16 twists. The stored force of the coil spring 6 causes the coil spring 6 to move from the second curved portion 20 into the pull-up groove 19, and the movable state in the pull-up groove 19 can be repeated. Therefore, the screen 5 is pulled up to the uppermost position by the stored force of the torsion coil spring 6.

When the screen 5 is pulled down from the state where the clutch ball 16 is located at the end point portion 21 of the stop groove 21, the clutch ball 16 returns from the first return groove 22 through the second return groove 23 into the pull-down groove 17. The state in which the pull-down groove 17 can be continuously moved is achieved. Therefore, when the screen 5 is pulled down from the state in which the clutch ball 16 is locked at the end portion 21a of the stop groove 21 and the screen 5 is prevented from being pulled up, the clutch ball 16 automatically pulls down.
Since it moves into the inside 7, the screen 5 can be further lowered.

On the other hand, when the clutch ball 16 continuously moves in the pull-up groove 19 and the screen 5 is pulled up, the rotation of the take-up shaft 4 rotates through the clutch cap 12, the planetary drum 24, the planetary gear 30, and the sun gear 28. Shaft 2
7, the disc portion 32 is rotated in the direction of arrow D in FIG. Then, as shown in FIG. 6, the first and second guide shafts 33 and 34 move in the first and second elongated holes 36 and 38, and the second guide shaft 34 becomes the second elongated hole 38. Wide part 3
Move to 8b. At this time, if the accumulated force of the torsion coil spring 6 is excessive and the pulling speed of the screen 5 is too fast,
The governor shaft 27 rotates faster, the centrifugal force acting on the governor weight 35 increases, and the governor weight 35 increases.
Rotates outward with the first guide shaft 33 as a fulcrum.

As a result, the sliding portion 37 of the governor weight 35 is in sliding contact with the inner peripheral surface of the governor drum 25 that rotates in the opposite direction at a quarter of the rotation speed of the governor weight 37, and rotation of the winding shaft 4 is suppressed. . Therefore, the pulling speed of the screen 5 is appropriately suppressed even when the stored force of the torsion coil spring 6 is excessive. The weight and shape of the governor weight 35 are set so that the governor weight 35 does not come into sliding contact with the governor drum 25 when the pulling speed of the screen 5 is not excessive.

As described above, in this lifting device, when the screen 5 is pulled down to the desired position and the hand is released, the clutch ball 16 is locked to the end point portion 21a of the stop groove 21 and the screen 5 is suspended and supported at that position. When the clutch ball 16 is moved to the first return groove 22 by slightly lowering the screen 5 and the hand is released, the screen 5 is twisted and the coil spring 6 is released.
It is pulled up to the highest position by the accumulated power of. On the other hand, when the screen 5 is pulled down from a state where the screen 5 is suspended and supported at a desired position, the clutch ball 16 automatically returns to the pull-down groove 17 through the first and second return grooves 22 and 23. Therefore, the torsion coil spring 6
The screen 5 can be pulled down only by the operation force that opposes the stored force.

Also, when the screen 5 is pulled up at an excessive speed by the governor device 9, the pulling speed can be appropriately suppressed, and when the screen 5 is pulled down, the governor device 9 operates even if the screen 5 is pulled down rapidly. Since it does not, the operation can be performed quickly and with a slight operation force.

Effect of the Invention As described in detail above, according to the present invention, when the rotation operation of the winding shaft 4 in the screen lowering direction is stopped, the movement of the sliding body 16 is blocked by the brake drum 13 via the stop groove 21. It is possible to prevent the screen 5 from being pulled down by the urging force of the urging means, and if the screen 5 is pulled down from this state, the screen 5 can be pulled down with a slight operating force that resists the urging force of the urging means. The take-up shaft 4 can be moved from the state where the movement of the sliding body 16 is blocked by the stop groove 21.
If the sliding member 16 is moved into the first return groove 22 by rotating the screen in the direction of pulling down the screen, it is possible to easily perform the pulling up operation of the screen 5 by the urging force of the urging means. To do.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a screen lifting device showing an embodiment of the present invention, FIG. 2 is a front view of a roller blind relating to the present invention, and FIG. 3 is a sectional view showing a brake drum portion of the lifting device. FIG. 4 is a developed view of the guide groove, and FIGS. 5 and 6 are sectional views showing the operation of the governor device. Mounting bracket 3a, winding shaft 4, screen 5, torsion coil spring 6, clutch cap 12, brake drum 13, guide groove 14, clutch ball 16, pull-down groove 17, pull-up groove 19, stop groove 21, first return groove. 22, second return groove 23.

Claims (1)

[Claims] 1. A winding shaft (4) for suspending and supporting a screen (5) is rotatably supported by mounting brackets (3a) at both ends, and the winding shaft is urged in a screen pulling direction by urging means. Then, a brake drum (13) fixed to the mounting bracket (3a) so as not to rotate is provided in the winding shaft, and a guide groove (14) is provided in the circumferential direction of the outer peripheral surface of the brake drum (13) to rotate the winding shaft. A slide body (16) for sliding in the guide groove is provided, and the guide groove includes a pull-down groove (17) with which the slide body slides when the winding shaft is rotated in a screen pull-down direction, and the winding groove. The take-up shaft is provided with a pull-up groove (19) on which the slide body slides when the take-up shaft is rotated in the screen pull-up direction, and a stop groove (21) for preventing rotation of the take-up shaft in the screen pull-up direction. How to pull the screen down When it is rotated in the screen pulling direction from the state of being rotated to, the pull-down groove and the stop groove are connected so as to guide the slide body from the pull-down groove to the stop groove, and the slide body is provided in the stop groove. A first return groove (22) for guiding the sliding body when the winding shaft is rotated in the screen pull-down direction from a state of being located in the stop groove is connected to the first return groove. Is configured to guide the slide body to the pull-up groove when the winding shaft is rotated in the screen pull-up direction from the state of being located in the first return groove, and the slide body is provided in the first return groove. Connects the second return groove (23) through which the sliding body is guided when the winding shaft is rotated in the screen pulling direction from the state where the second return groove is located in the first return groove. Rotate the take-up shaft in the pull-down direction The sliding body is located in said second return groove to guide the pull-down groove time,
A roll blind raising / lowering device, characterized in that when the winding shaft is rotated in a pulling direction, the sliding body located in the second return groove is guided to the pulling groove.