JP2022164420A - switching device - Google Patents

Abstract

To provide technology allowing an operative mechanism executing operations on closing/opening a shield device according to the state of a shield material.SOLUTION: A switching device 6 provided at a shield device opening/closing a shield material comprises a gear shaft 62 into which a rotation of a drive shaft lifting/lowering the shield material is input, a movable part 65 moving in an axial direction of the gear shaft 62 according to a rotation of the gear shaft 62, a transmission part 66 transmitting rotational force to an operational mechanism 67 executing operations on lifting/lowering or opening/closing of the shield material, or transmitting force generated at the operational mechanism 67 to the drive shaft, and a switching part 64 switching between a transmission state where the transmission is executed by the transmission part 66 and a non-transmission state where the transmission is released according to the movement of the movable part 65.SELECTED DRAWING: Figure 6

Description

This embodiment relates to a switching device for a shielding device that opens and closes a shielding material.

2. Description of the Related Art Conventionally, as a technology for braking the movement of a shielding material in a shielding device, a braking device that limits the rotation speed of a drive shaft that raises and lowers the shielding material to a predetermined speed or less is known (see Patent Document 1). According to this braking device, when the shielding material descends due to its own weight, it is possible to prevent members such as the weight bar and the bottom rail at the lowest end of the shielding device from vigorously colliding with the floor surface. However, according to this technique, since the rotation of the drive shaft is constantly braked, a situation may arise in which the shielding material does not descend to the desired position due to its own weight.

JP-A-2001-112616

Provided is a technique capable of switching and operating an operating mechanism that performs operations related to opening and closing of a shielding device according to the state of a shielding material.

In order to solve the above-described problems, one aspect of the present invention is a switching device provided in a shielding device that opens and closes a shielding material, comprising: a gear shaft to which rotation of a drive shaft for raising and lowering the shielding material is input; a moving part that moves in the axial direction of the gear shaft according to the rotation of the gear shaft; a transmission portion that transmits the force generated in the mechanism to the drive shaft; and a transmission state in which transmission is performed by the transmission portion according to the movement of the moving portion, and a non-transmission state in which the transmission is canceled. and a switching unit.

ADVANTAGE OF THE INVENTION According to this invention, the operation|movement mechanism which performs the operation|movement regarding opening and closing of a shielding apparatus can be switched according to the state of a shielding material, and can be operated.

It is a front view which shows the structure of the shielding apparatus which concerns on 1st Embodiment. 1 is a schematic perspective plan view showing the configuration of a shielding device according to a first embodiment; FIG. FIG. 4 is a front view showing the shielding device with the bottom rail raised; FIG. 4 is a schematic plan perspective view showing the shielding device with the first drive shaft rotated; It is a perspective view which shows the external appearance of a brake device. It is a perspective view which shows the internal structure of a brake device. It is a right view which shows the internal structure of a brake device. It is a perspective view which shows the structure of a moving part. It is a perspective view which shows the structure of a transmission part. It is a left view which shows the brake device in a non-transmitting state. It is a left view which shows the brake equipment in a transmission state. FIG. 4 is a front view showing the shielding device in a state where only the first brake is actuated; It is a perspective view which shows a brake device in a non-transmission state. FIG. 13 is a cross-sectional view taken along line AA of FIG. 12; It is a front view which shows a shielding apparatus in the state in which the 1st brake and brake equipment act|operate. It is a perspective view which shows a brake device in a transmission state. FIG. 16 is a cross-sectional view taken along line BB of FIG. 15; It is a schematic diagram showing the configuration of a shielding device according to a second embodiment. It is a schematic plan view which shows the structure of the brake device which concerns on 2nd Embodiment. Fig. 3 is a schematic side view of the shielding device with the bottom rail in the lower end position; Fig. 10 is a schematic side view of a shielding device with rotated slats; FIG. 4 is a schematic side view of the shielding device with raised slats; Fig. 10 is a schematic side view showing the shielding device with the bottom rail in the upper limit position; FIG. 4 is a schematic side view showing the shielding device in a lowered operation; It is a schematic side view which shows the shielding apparatus which a bottom rail descend|falls by dead weight. FIG. 4 is a schematic side view of a shielding device with interlocking slats; Fig. 2 is a schematic side view of the shielding device with the slats fully closed and the bottom rail in the lower end position;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, a shielding device in which the present invention is applied to a pleated screen provided with two types of vertically movable screens as a shielding material will be described as an example. In this embodiment, when the shielding device is installed, the indoor side is the front, the outdoor side is the back, the direction consisting of the front and back is the front-back direction, and the longitudinal direction of the shielding device is the left-right direction. hereinafter, will be described. Further, in the present specification and drawings, constituent elements having substantially the same functions are denoted by the same reference numerals, thereby omitting redundant description.

<First embodiment>
(overall structure)
The overall configuration of the shielding device according to the first embodiment will be described. 1 and 2 are a front view and a schematic perspective plan view, respectively, showing the configuration of a shielding device according to this embodiment. Note that FIG. 1 shows the shielding device with the bottom rail lowered to the lower end position, and only the inside of the headbox is shown.

As shown in FIGS. 1 and 2, the shielding device 1 according to this embodiment includes a head box 2, a bottom rail 31 as a first moving member, and two lifting cords formed in a string or tape shape. 32, a screen 33 as a first shielding material, an intermediate bar 41 as a second moving member, two string-like or tape-like dimming cords 42, and a screen 43 as a second shielding material. and an operation unit 5.

The head box 2 is formed in a substantially rectangular parallelepiped shape defining an accommodation space inside, and is fixed to a window frame or the like (not shown) via a plurality of brackets 21 . Inside the head box 2 are a first drive shaft 201A, two first winding drums 202A, a first stopper 203A, a first brake 204A, a second drive shaft 201B, and two second winding drums. 202B, the second stopper 203B, the second brake 204B, the interlocking gear 205, and the braking device 6 are accommodated.

The first drive shaft 201A, the two first winding drums 202A, the first stopper 203A, and the first brake 204A constitute a first drive system for moving the bottom rail 31 up and down. Also, the second drive shaft 201B, the two second winding drums 202B, the second stopper 203B, and the second brake 204B constitute a second drive system for moving the intermediate bar 41 up and down. The interlocking gear 205 is configured to interlock the second drive system with the first drive system under predetermined conditions. In this embodiment, the first drive system is arranged on the rear side, the second drive system is arranged on the front side, and the first drive system and the second drive system are arranged side by side in the front-rear direction with their positions different from each other. be. For example, the first drive system and the second drive system may be arranged side by side so that their positions are different in the vertical direction. You can do it.

The first drive shaft 201A and the second drive shaft 201B are prismatic members that extend in the left-right direction, and are rotatably supported in the head box 2 with the axial direction in the left-right direction. Here, the axial center of the first drive shaft 201A and the axial center of the second drive shaft 201B are located at the same position and rearward in the vertical direction, and the positions of the axial centers are different in the front-rear direction.

Each of the two first winding drums 202A is penetrated by the first driving shaft 201A so as to rotate integrally with the first driving shaft 201A, and one end of the corresponding lifting cord 32 of the two lifting cords 32 is wound and wound. They are connected so that they can be unwound. Each of the two second winding drums 202B is penetrated by the second drive shaft 201B so as to rotate integrally with the second drive shaft 201B, and one end of the corresponding dimming cord 42 out of the two dimming cords 42 is wound. It is connected so that it can be taken up and unwound.

The first stopper 203A restricts rotation of the first drive shaft 201A in the unwinding direction. The second stopper 203B restricts rotation of the second drive shaft 201B in the unwinding direction. Further, the first stopper 203A and the second stopper 203B are configured to be switchable between a state of restricting rotation of the first drive shaft 201A and the second drive shaft 201B and a state of allowing the rotation thereof.

The first brake 204A reduces the rotational speed of the first drive shaft 201A in the unwinding direction. The second brake 204B reduces the rotational speed of the second drive shaft 201B in the unwinding direction. The first brake 204A and the second brake 204B decelerate the rotational speeds of the first drive shaft 201A and the second drive shaft 201B, respectively, thereby reducing the impact caused when the bottom rail 31 and the intermediate bar 41 descend to the lower end positions. relieve force.

The bottom rail 31 is connected to the other end of the two lifting cords 32, is suspended from the head box 2 so as to be positioned at the lowermost end of the shielding device 1, and is elongated in the left-right direction. is. The intermediate bar 41 is connected to the other ends of the two dimming cords 42 and is suspended from the head box 2 so as to be positioned between the head box 2 and the bottom rail 31 in the vertical direction. It is a member formed in a long length.

The screen 33 has an upper end connected to the lower surface of the intermediate bar 41 and a lower end connected to the upper surface of the bottom rail 31. The screen 33 is formed in a pleated shape that can be folded vertically. It is a shielding member inserted in the direction. The screen 43 has an upper end connected to the lower surface of the head box 2 and a lower end connected to the upper surface of the intermediate bar 41, and is formed in a pleated shape that can be folded vertically. It is a shielding member inserted vertically.

The operation unit 5 has an endless operation cord 51 configured as, for example, a ball chain, and operates as a first driving unit to raise and lower the bottom rail 31 and the intermediate bar 41 according to the user's elevation operation on the operation cord 51 . The shaft 201A and the second drive shaft 201B are rotated.

(Configuration of brake device)
A configuration of the brake device will be described. FIG. 3 is a front view showing the shielding device with the bottom rail raised. FIG. 4 is a schematic plan perspective view showing the shielding device with the first drive shaft rotated. FIG. 5 is a perspective view showing the appearance of the brake device. 6 and 7 are a perspective view and a right side view, respectively, showing the internal configuration of the braking device. 8 and 9 are perspective views showing the structures of the moving part and the transmitting part, respectively. 10 and 11 are left side views showing the braking device in the non-transmitting state and the transmitting state, respectively.

As shown in FIG. 3, when the operation cord 51 of the operation unit 5 is pulled a predetermined distance and then released while the bottom rail 31 is raised, the rotation of the first drive shaft 201A is restricted by the first stopper 203A. As shown in FIG. 1, the bottom rail 31 descends to the lower end position due to its own weight. The brake device 6 is connected to the first drive shaft 201A, as shown in FIG. 4, and reduces the rotation speed of the first drive shaft 201A before the bottom rail 31 reaches the lower end position. While the first brake 204A always decelerates the rotation of the first drive shaft 201A in the unwinding direction, the brake device 6 operates according to the position of the bottom rail 31, specifically, the amount of rotation of the first drive shaft 201A. to slow down. The amount of rotation here means the amount of rotation of the first drive shaft 201A required to lower the bottom rail 31 from the reference position to the current position. That is, the amount of rotation of the first drive shaft 201A at the reference position is zero. Also, the reference position may be the upper limit position or may be a predetermined position.

As shown in FIGS. 5 to 7, the brake device 6 includes a housing member 60, an input gear 61, a gear shaft 62, a support shaft 63, a switching portion 64, a moving portion 65, a transmission portion 66, and a brake 67. The housing member 60 is formed in a substantially rectangular parallelepiped shape as a whole, defines a housing space, and is a member that is fixed to one end (left side in FIGS. 1 to 4) in the head box 2 . An input gear 61 , a gear shaft 62 , a support shaft 63 , a switching portion 64 , a moving portion 65 , a transmission portion 66 and a brake 67 are accommodated in the accommodation space of the accommodation member 60 .

The input gear 61 is a gear that is pivotally supported so as to rotate about an axis directed in the left-right direction. Also, the input gear 61 is connected to the first drive shaft 201A so as to be able to rotate integrally therewith, and receives the rotational force of the first drive shaft 201A. The gear shaft 62 is positioned on the front side of the input gear 61, is rotatably supported by the housing member 60 so that its axial direction is oriented in the left-right direction, and is formed with a tooth profile extending substantially in the left-right direction. is. Further, the gear shaft 62 is provided so as to mesh with the input gear 61 on the inner side in the left-right direction.

The support shaft 63 is positioned on the front side of the gear shaft 62 and has a shaft portion 630 and a projecting portion 631 . The shaft portion 630 is a member that extends in the left-right direction, has its axial direction oriented in the left-right direction, and has a thread groove formed in its outer peripheral wall. The protruding portion 631 is formed to protrude inward in the lateral direction (bottom right in FIG. 6) from a wall portion that extends radially outward in the lateral direction (upper left in FIG. 6) of the shaft portion 630. .

The switching portion 64 is a member that is generally formed in a substantially plate shape extending in the front-rear direction and the left-right direction, and is provided in the housing member 60 so as to be movable only in the front-rear direction. A guide portion 641 is formed in the switching portion 64 , and a bearing portion 642 (see FIG. 7) is formed behind the guide portion 641 . The guide portion 641 is formed as a slit that extends in the left-right direction and penetrates in the up-down direction. and a transition region R3 located between the non-transmission region R1 and the transmission region R2 in the left-right direction. The non-transmitting region R1 is a slit linearly extending in the horizontal direction for a predetermined distance. The transmission region R2 is a slit that is located in front of the non-transmission region R1 and extends substantially linearly in the horizontal direction for a predetermined distance. The transition region R3 is a slit that connects the non-transmission region R1 and the transmission region R2.

The moving part 65 has a slide gear 651 and a slider 652, as shown in FIG. The slide gear 651 is a gear that is inserted through and supported by the shaft portion 630 of the support shaft 63 and is formed to mesh with the gear shaft 62, and is formed with an engagement groove 651a, an insertion hole 651b, and a protrusion 651c. be. The slider 652 is a member formed to move along the guide portion 641 of the switching portion 64 by being pushed by the slide gear 651, and has an engaged portion 652a and a guided portion 652b.

The engagement groove 651 a is a groove formed so as to be recessed radially inward along the entire circumference of the slide gear 651 . In a state where the slide gear 651 is supported by the support shaft 63 and the slider 652 is attached to the switching portion 64, the engaged portion 652a of the slider 652 is positioned within the engaging groove 651a. The engaged portion 652a is formed in a substantially U-shape corresponding to the engaging groove 651a. The contact area can be increased.

The insertion hole 651b is a hole through which the shaft portion 630 of the support shaft 63 can be inserted, whereby the slide gear 651 is rotatably supported by the support shaft 63. The inner peripheral wall of the slide gear 651 formed by the insertion hole 651b is formed with a screw thread that engages with the thread groove formed in the outer peripheral wall of the shaft portion 630 . As a result, as shown in FIG. 6, the slide gear 651 is rotated to move in the left-right direction. As shown in FIG. 7, the input gear 61 meshes with the gear shaft 62, and the gear shaft 62 meshes with the slide gear 651. Therefore, the gear shaft 62 rotates in the direction opposite to the input gear 61, and the slide gear 651 rotates with the input gear 61. Rotate in the same direction. In the present embodiment, when the first drive shaft 201A rotates in the unwinding direction, the slide gear 651 rotates clockwise when viewed from the right side and moves outward in the left-right direction.

The guided portion 652b is formed at the lower end of the slider 652 and is formed so as to be able to pass through and slide along the guiding portion 641 formed as a slit. When the slide gear 651 is moved in the left-right direction, the slider 652 is pushed by the slide gear 651 via the engaged portion 652a engaged with the engagement groove 651a, and the slider 652 is guided by the switching portion 64. It moves left and right along the portion 641 .

The projecting portion 651c is formed on the laterally outward side surface of the slide gear 651 so as to protrude outwardly in the lateral direction. When the slide gear 651 is moved laterally outward and reaches the laterally outer end of the support shaft 63, the projecting portion 651c and the projecting portion 631 of the support shaft 63 are engaged in the rotational direction of the slide gear 651. , the rotation of the slide gear 651 and further outward movement in the left-right direction are prevented.

The transmission portion 66 has an annular portion 660, a first arm portion 661, a second arm portion 662, and an intermediate gear 663, as shown in FIG. The annular portion 660 is formed in an annular shape, and is rotatably attached to the gear shaft 62 about an axis extending in the left-right direction by inserting a cylindrical portion formed at the left-right direction outer end of the gear shaft 62 . Supported. The first arm portion 661 is a member extending radially from the annular portion 660 so as to be connectable with the switching portion 64 located below the annular portion 660. A connecting shaft 661a extending inward in the left-right direction provided in The second arm portion 662 is positioned behind the first arm portion 661 and radially extends from the annular portion 660 so as to form a predetermined angle with the first arm portion 661 with the center of the annular portion 660 as the vertex. A support shaft 662a, which is a member and extends inward in the left-right direction, is provided at the tip.

The brake 67 is configured as a centrifugal brake in this embodiment and has a body portion 670 and a driven gear 671 . The body portion 670 is a member that defines a space inside, and in this space, the brake shoe is configured to slidably contact the inner wall of the body portion 670 by centrifugal force, and rotates around an axis directed in the left-right direction. A rotating body (not shown) is accommodated. The driven gear 671 is connected to the rotating body in the body portion 670 so as to be able to rotate integrally therewith, and is configured to mesh with the intermediate gear 663 . It should be noted that the brake 67 may be any device as long as it generates a braking force that decelerates the rotational force, and may be another type of speed reducer. As this type of speed reducer, for example, there is an oil brake that generates a braking force by the resistance force of highly viscous oil.

The intermediate gear 663 is rotatably supported by the support shaft 662a, is formed to mesh with the gear shaft 62 and the driven gear 671 of the brake 67, and is provided so as to mesh with the gear shaft 62 at all times. The transmission portion 66 is connected to the switching portion 64 with the connecting shaft 661a rotatably fitted in the bearing portion 642 of the switching portion 64, whereby the transmission portion 66 rotates according to the movement of the switching portion 64 in the front-rear direction. be done.

In the second arm portion 662, the intermediate gear 663 and the driven gear 671 are separated from each other when the switching portion 64 is positioned forward as shown in FIG. 10, and the switching portion 64 is moved rearward as shown in FIG. In this case, the intermediate gear 663 is moved upward and meshed with the driven gear 671 . By meshing the intermediate gear 663 and the driven gear 671 , the brake 67 decelerates the first drive shaft 201 A via the intermediate gear 663 , the gear shaft 62 and the input gear 61 .

The gear shaft 62, the support shaft 63, and the slide gear 651 of the moving portion 65 constitute a regulation mechanism. This restriction mechanism restricts the range of movement of the slide gear 651 on the shaft portion 630 of the support shaft 63 to restrict the range of rotation of the first drive shaft 201A. And the range of elevation of the screen 33 can be limited. In this embodiment, the lower end position of the bottom rail 31 is set by the regulation mechanism.

Further, the switching portion 64, the slider 652 of the moving portion 65, and the transmission portion 66 constitute a switching mechanism. This switching mechanism moves the moving portion 65 in the front-rear direction when the slider 652 of the moving portion 65 is guided to a region shifted in the front-rear direction from other portions of the guide portion 641 of the switching portion 64, The braking device 6 is switched between a transmission state and a non-transmission state. When the brake device 6 is in the transmission state, the intermediate gear 663 of the transmission portion 66 meshes with the driven gear 671 of the brake 67, thereby transmitting the braking force of the brake 67 to the first drive shaft 201A. On the other hand, when the brake device 6 is in the non-transmission state, transmission of the braking force of the brake 67 to the first drive shaft 201A is released. In this embodiment, the brake device 6 is set to be in the transmission state in the range (transmission region R2) corresponding to the lower end position of the bottom rail 31 set by the regulation mechanism.

(Operation of brake device)
The operation of the braking device will be explained. 12 and 15 are front views showing the shielding device in a state in which only the first brake is actuated and a state in which the first brake and the braking device are actuated, respectively. 13 and 16 are perspective views showing the braking device in the non-transmission state and transmission state, respectively. 14 is a cross-sectional view taken along the line AA of FIG. 12. FIG. 17 is a cross-sectional view taken along line BB of FIG. 15. FIG.

As shown in FIG. 12, in the shielding device 1, when the bottom rail 31 is lowered by its own weight and is at a position relatively separated from the lower end position, the slider 652 of the moving part 65 is moved as shown in FIG. It is positioned within the non-transmission region R1 in the guide portion 641 of the switching portion 64 . At this time, as shown in FIG. 14, the intermediate gear 663 and the driven gear 671 are separated from each other, and the first drive shaft 201A is not connected to the brake 67 in the brake device 6. In the non-transmitting state, the rotation of the first drive shaft 201A in the shielding device 1 is slowed down only by the first brake 204A.

On the other hand, as shown in FIG. 15, in the shielding device 1, when the bottom rail 31 is lowered by its own weight and is relatively close to the lower end position, as shown in FIG. It moves beyond the transition region R3 at 641 into the transfer region R2. At this time, as shown in FIG. 17 , the brake device 6 enters a transmission state in which the intermediate gear 663 and the driven gear 671 are meshed and the first drive shaft 201A is connected to the brake 67 . In the transmission state, the rotation of the first drive shaft 201A in the shielding device 1 is further slowed down by the braking device 6 .

Thus, according to the brake device 6 according to the present embodiment, by switching the transmission state between the intermediate gear 663 and the driven gear 671 according to the rotation amount of the first drive shaft 201A, the position of the bottom rail 31 can be changed. By using the brake 67, the rotation of the first drive shaft 201A can be decelerated. That is, the rotation of the first drive shaft 201A can be decelerated by the brake 67 according to the position of the bottom rail 31 by cooperation between the regulation mechanism and the switching mechanism.

In this embodiment, the present invention is applied to the shielding device 1 having two screens 33 and 43 as shielding materials. Applicable to all shielding devices.

Further, by appropriately changing the slit shape of the guide portion 641 in this embodiment, the position of the bottom rail 31 at which the rotation of the first drive shaft 201A is further decelerated by the brake 67 can be arbitrarily determined. device design becomes possible.

Further, in this embodiment, when the bottom rail 31 descends to a predetermined position (near the lower end position), the brake 67 further decelerates the rotation of the first drive shaft 201A. It can also be applied to other shielding devices with configurations. For example, when the shielding device to be applied is a roll screen, when the screen is wound on the winding pipe and the weight bar at the end of the screen rises to a predetermined position (near the upper end position), the same restriction mechanism and switching mechanism A brake may be operated in cooperation with to decelerate the rotation of the winding pipe. As a result, it is possible to prevent the weight bar from jumping up due to the screen being vigorously wound up.

<Second embodiment>
(Constitution)
The configurations of the shielding device and the clutch device according to the second embodiment will be described. FIG. 18 is a schematic diagram showing the configuration of the shielding device according to this embodiment. FIG. 19 is a schematic plan view showing the configuration of the brake device according to this embodiment.

As shown in FIG. 18, the shielding device 1A according to this embodiment differs from the first embodiment in that it is configured as a horizontal blind and that it includes a clutch device 6A instead of the braking device 6. As shown in FIG. The shielding device 1A includes a headbox 7, an operation unit 9 provided in the headbox 7, a bottom rail 81, and a plurality of slats 82. Inside the head box 7 are a first drive shaft 701 and a second drive shaft 702, two elevating drums 703 rotated by the first drive shaft 701, and two rotary drums 704 rotated by the second drive shaft 702. and a clutch device 6A.

The operation unit 9 is provided inside the head box 7 on the right side in FIG. The operation unit 9 rotates the first drive shaft 701 when the operation cord 91 is pulled, and rotates the second drive shaft 702 when the operation rod 92 is rotated around the axis. The operating cord 91 is configured to maintain its lower end position and be wound up within the operating unit 9 . The operation unit 9 rotationally drives the first drive shaft 701 when the operation cord 91 is pulled more than a predetermined distance. Further, the operation unit 9 restricts the rotation of the first drive shaft 701 when the operation cord 91 is not operated, and this restriction is released when the operation cord 91 is pulled below a predetermined distance. .

A plurality of slats 82 are supported by ladder cords 84 between the headbox 7 and the bottom rail 81 so as to be vertically arranged. The ladder cord 84 has one end connected to the rotating drum 704 and hangs down from the head box 7, and the other end connected to the bottom rail 81. The ladder cord 84 is arranged in front and rear of the slat 82 so as to sandwich the slat 82 individually. to support. The slats 82 are tilted by the relative movement of the front and rear ladder cords 84 along the vertical direction in accordance with the rotation of the rotating drum 704, and are rotated in a fully closed, horizontal (fully open), or anti-fully closed state. do.

The bottom rail 81 is suspended and supported so as to be positioned at the lowest end of the shielding device 1A by connecting to the other end of a lifting cord 83 whose one end is connected to the lifting drum 703 so as to be wound and unwound. . As the lifting cord 83 is wound and unwound by the lifting drum 703, the bottom rail 81 is moved up and down, and the plurality of slats 82 are also moved up and down.

The clutch device 6A differs from the brake device 6 in that the input gear 61 is omitted, the gear shaft 62A is provided instead of the gear shaft 62, and the clutch 68 is provided instead of the brake 67. The clutch 68 has a body portion 680 and a driven gear 681 . The driven gear 681 meshes with the intermediate gear 663 and inputs rotational force to the body portion 680 . The body portion 680 is connected to the second driving shaft 702 and transmits only one-directional rotational force among the rotational force input from the driven gear 681 to the second driving shaft 702 .

In this embodiment, the clutch 68 transmits to the second drive shaft 702 only the torque in the direction of rotation when the bottom rail 81 is lowered. Further, since the input gear 61 is omitted and the gear shaft 62A is connected to the first drive shaft 701 so as to rotate integrally therewith, when the rotation of the first drive shaft 701 is transmitted to the second drive shaft 702, the first drive shaft 62A is rotated. The shaft 701 and the second drive shaft 702 are rotated in the same direction.

(motion)
The operation of the shielding device according to the second embodiment will be described. 20 to 27 are schematic side views showing the shielding device, respectively, with the bottom rail at the lower end position, the slats rotated, the slats raised, and the bottom rail at the upper limit position. A certain state, a state in which a lowering operation has been performed, a state in which the bottom rail is lowered by its own weight, a state in which the slats are interlocked and rotated, and a state in which the slats are fully closed and the bottom rail is at the lower end position.

As shown in FIG. 20, in a state in which the slat 82 has stopped moving up and down, when the operating rod 92 is rotated around the axis by the operator as shown in FIG. 704 is rotated and slat 82 is tilted.

Further, as shown in FIG. 22, when the operator pulls the operation cord 91 by a distance greater than a predetermined distance, the rotation of the first drive shaft 701 causes the lifting drum 703 to rotate and the bottom rail 81 to rise. When this pulling operation is performed a plurality of times, the bottom rail 81 is raised to the upper end position as shown in FIG.

Further, as shown in FIG. 24, when the operating cord 91 is pulled by the operator by a predetermined distance or less, the restraint of the first drive shaft 701 is released, and the bottom rail 81 is lowered by its own weight, and as shown in FIG. When the bottom rail 81 reaches the vicinity of the lower end, the slider 652 in the clutch device 6A moves over the transition area R3 in the guide portion 641 and into the transmission area R2. As a result, the intermediate gear 663 and the driven gear 681 of the clutch device 6</b>A are engaged with each other, and the first drive shaft 701 is connected to the clutch 68 in a transmission state.

In the transmission state, the rotation of the first drive shaft 701 in the shielding device 1A is transmitted to the second drive shaft 702 via the clutch 68, and as shown in FIG. As a result, the bottom rail 81 descends and the slats 82 are tilted. As shown in FIG. 27, the bottom rail 81 stops at the lower end position and the shielding device 1A is fully closed.

Thus, the switching mechanism can switch not only the brake 67 but also the clutch 68 . That is, the switching mechanism transmits force to the driving shaft for moving up and down the shielding material to the operating mechanism that performs the operation related to the lifting or rotating of the shielding material, that is, the opening and closing of the shielding material, or transmits the force to the drive shaft by the operating mechanism. can be switched. In addition, the rotation range of the first drive shaft 701 does not necessarily have to be restricted, and the gear shaft 62, the switching portion 64, the moving portion 65, the transmission portion 66, and the support shaft 63 that does not restrict the movement range of the slide gear 651 can transmit A switching device may be configured to switch states.

The invention may be embodied in various other forms without departing from its spirit or essential characteristics. Therefore, the above-described embodiments are merely examples in all respects and should not be construed in a restrictive manner. The scope of the present invention is indicated by the claims and is not restricted by the text of the specification. Furthermore, all modifications, various improvements, substitutions and modifications that fall within the equivalent scope of claims are within the scope of the present invention.

1 Shielding device 6 Brake device 61 Input gears 62, 62A Gear shaft 63 Support shaft 64 Switching part 65 Moving part 66 Transmission part 67 Brake 68 Clutch

Claims (5)

A switching device provided in a shielding device that opens and closes a shielding material,
a gear shaft to which rotation of a drive shaft for raising and lowering the shielding material is input;
a moving part that moves in the axial direction of the gear shaft as the gear shaft rotates;
a transmission unit that transmits the rotational force of the drive shaft to an operating mechanism that performs an operation related to raising and lowering or opening and closing the shielding material, or that transmits the force generated in the operating mechanism to the drive shaft;
A switching device comprising: a switching unit that switches between a transmission state in which transmission is performed by the transmission unit and a non-transmission state in which the transmission is canceled according to movement of the moving unit. the actuation mechanism has a driven gear for operating the actuation mechanism;
2. The switching device according to claim 1, wherein the transmission unit has an intermediate gear that meshes with the gear shaft and meshes with the driven gear when the switching device is in the transmission state. The switching portion is provided movably in an orthogonal direction orthogonal to the axial direction, and is provided with a guide portion that guides the moving portion, and the guide portion guides the moving portion along the axial direction. a transmission region, and a transmission region that guides the moving part along the axial direction at different positions on one side in the orthogonal direction with respect to the non-transmission region,
3. The switching device according to claim 2, wherein the transmission section engages the intermediate gear and the driven gear when the switching section is moved in the opposite direction in the orthogonal direction. 4. The switching according to claim 3, wherein the moving portion has a slide gear that meshes with the gear shaft, and a slider that is pushed by the slide gear and moves in the axial direction along the guide portion. Device. further comprising a support shaft that rotatably supports the slide gear;
5. The switching device according to claim 4, wherein the slide gear moves in the axial direction of the support shaft by being rotated.

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