JP7361553B2 - Detection device and shielding device - Google Patents

Description

The present invention relates to a sensing device and a shielding device.

A conventional shielding device equipped with a detection device has been proposed (for example, see Patent Document 1). In the detection device of Patent Document 1, when the bottom rail collides with an obstacle while automatically lowering the shielding material using its own weight, the obstacle detection function is activated and stops the descent of the shielding material. It exhibits a descent stop function. The detection device of Patent Document 1 includes a winding cone, a clutch, and a rotating drum. A lifting cord is suspended from the winding cone, and the winding cone and clutch are rotatably supported by a support member.

In Patent Document 1, the rotating drum has a sliding protrusion, and the clutch has a sliding hole in which the sliding protrusion is slidably provided. When the rotating drum and the clutch rotate relative to each other, the sliding protrusion contacts the edge of the sliding hole and moves from one side of the sliding hole to the other, causing the detection device to detect an obstacle. function is demonstrated. This causes the clutch to move in the axial direction so that the clutch engages with the braking protrusion of the support member, the lowering stop function of the detection device is performed, and the take-up cone becomes unable to rotate.

Japanese Patent Application Publication No. 2005-179994

Not only types of shielding devices that automatically lower the shielding material using the weight of bottom rails, etc., but also types that lower the shielding material by the user operating an operation code have been proposed. . It is also possible to equip a shielding device of this type with a detection device. In this case, if the user suddenly operates the operating cord, the rotating drum may rotate relative to the clutch against the user's will, and the obstacle detection function of the detection device may be activated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a detection device that can prevent the obstacle detection function from being performed against the user's will.

According to the present invention, the invention includes a winding member, a rotating drum, and a clutch, the winding member is configured to be able to wind up and unwind the lifting cord, and the rotating drum is configured to be able to wind up and unwind the lifting cord. The winding member is configured such that movement in the axial direction is restricted, and is rotatable relative to the winding member within a predetermined angular range, and rotates integrally with the winding member beyond that range. The clutch is configured to rotate integrally with the winding member and to be movable relative to the winding member by rotation of the rotating drum, and one of the clutch and the rotating drum has a play portion. There is provided a detection device, wherein the play portion is configured so that the clutch does not move relative to the winding member even when the rotating drum rotates.

According to the present invention, one of the clutch and the rotating drum has a play portion configured to prevent the clutch from moving relative to the winding member even when the rotating drum rotates. Therefore, even if the lifting shaft and the rotary drum that rotates integrally with it suddenly rotate due to the user suddenly operating the operating code, the clutch is prevented from moving relative to the winding member. As a result, according to the present invention, it is possible to prevent the obstacle detection function from being performed against the user's will.

Various embodiments of the present invention will be illustrated below. The embodiments shown below can be combined with each other.
One of the clutch and the rotating drum has a sliding hole, the other of the clutch and the rotating drum has a sliding protrusion, and the sliding hole has a slope and a sliding hole. , the sliding protrusion is inserted into the sliding hole, and the inclined portion extends obliquely with respect to the central axis of the rotating drum; A detection device is provided in which the play portion is provided on an end side of the inclined portion and extends in the circumferential direction along the rotational direction of the elevating shaft.

According to an embodiment of another aspect of the present invention, the winding member includes a winding member, a rotating member, a clutch, a lifting shaft, a lifting cord, and a braking body, and the winding member supports the lifting cord. The rotating member is configured to be able to take up and unwind, the rotating member is configured to rotate integrally with the lifting shaft, the clutch is configured to be able to rotate integrally with the winding member, and the clutch is configured to be able to rotate integrally with the winding member. The lifting shaft can be engaged with the braking body so as not to rotate in the rewinding direction of the lifting cord, and when the clutch engages the braking body, the rotation of the lifting shaft is prevented from rotating from the rotating member. The transmission is directly or indirectly transmitted to the clutch, and at least one of the winding member, the rotating member, and the clutch is provided with a play part, and the play part is configured to transmit the signal within a predetermined non-transmission angle range. A shielding device is provided that is configured so that even if the rotating member rotates, the rotation of the rotating member is not directly or indirectly transmitted to the clutch.
Preferably, the rotating member includes a rotating drum, and the rotating drum is configured to rotate integrally with the lifting shaft, and movement in the axial direction with respect to the winding member is restricted. and is capable of relative rotation with respect to the winding member within a predetermined angular range, and rotates integrally with the winding member beyond that range, and the clutch is configured to rotate with the winding member. The play section is configured to move relative to the winding member due to relative rotation with the drum and to be able to engage with the brake body, and the play section is provided on one of the clutch and the rotating member, and the play section is configured to be able to engage with the brake body. is configured such that the clutch does not move relative to the winding member even if the rotating drum rotates relative to the clutch within the non-transmission angle range, and A shielding device is provided, wherein when the rotating drum rotates relative to the clutch, the clutch moves relative to the take-up member and the clutch engages the brake body. Ru.
Preferably, one of the clutch and the rotating drum has a sliding hole, the other of the clutch and the rotating drum has a sliding protrusion, and the sliding hole includes: It has an inclined part and the play part, and the sliding protrusion is inserted into the sliding hole, and the inclined part extends so as to be inclined with respect to the central axis of the rotating drum. A shielding device is provided in which the play portion is provided on an end side of the inclined portion and extends in the circumferential direction along the rotation direction of the rotating drum.
Preferably, the rotating member includes a rotating drum and a play member, and the rotating drum is configured to be limited in axial movement with respect to the winding member, and the rotating drum is configured to be limited in axial movement relative to the winding member. The clutch is rotatable relative to the winding member within a predetermined angular range, and rotates integrally with the winding member beyond that range, and the clutch rotates relative to the winding member by rotation of the rotating drum. The play member is configured to be movable and engageable with the brake body, the play member has the play portion, and is configured to rotate together with the elevating shaft, and the play member is configured to be able to move in the non-transmission angle range. The play member is configured to rotate relative to the rotating drum within the range, and when the play member rotates relative to the rotating drum beyond the non-transmission angle range, the play member rotates relative to the rotating drum. A shielding device is provided, the shielding device being configured to rotate integrally with the winding member so that the clutch moves relative to the winding member and the clutch engages the brake body.
Preferably, the take-up member and the clutch are configured to rotate together, the rotating member has a play member, the braking body is movable between first and second positions, and the first and second positions are movable. In the position, the brake body cannot engage with the clutch, in the second position, the brake body can engage with the clutch, and the play member has the play part and is connected to the lifting shaft. The play section is configured to rotate integrally with the winding member, and is configured to have limited movement in the axial direction with respect to the winding member, and when the brake body is located at the second position, the play portion When the play member is configured to rotate relative to the take-up member within an angular range, and when the play member rotates relative to the take-up member beyond the non-transmission angle range, the play member rotates relative to the take-up member. There is provided a shielding device configured to rotate integrally with the winding member and the clutch so that the clutch engages the brake body.
Preferably, the elevator shaft further includes an operation cord and a bottom rail, and the elevating shaft is configured to rotate when the operation cord is operated, and the bottom rail is rotated from when the bottom rail is located at the top. A shielding device is provided, configured such that the bottom rail is lowered by a pull-down motion on the operating cord until it is located in the lowest position.
Preferably, the shielding material further includes a slat, and the slat has first and second edges, and the first and second edges extend in the longitudinal direction of the slat. A shielding device is provided in which the lifting cord is inserted through the first edge or the second edge or is arranged to face the first edge or the second edge.
Preferably, the right winding member further includes a head box, a right winding member, a left winding member, a right lifting cord, and a left lifting cord, and the right winding member moves the right side up and down as the lifting shaft rotates. The left winding member is configured to be able to wind up and unwind the lifting cord, the left winding member is configured to be able to wind up and unwind the left lifting cord as the lifting shaft rotates, and the head box includes: The winding member, the right winding member, and the left winding member are mounted, and the winding member includes a shielding device disposed between the right winding member and the left winding member. provided.

FIG. 1A is a front view of the horizontal blind 100. FIG. 1B is a right side view of the horizontal blind 100 shown in FIG. 1A. FIG. 5 is an exploded perspective view of the detection device 50. 3A is a perspective view of the rotating drum 4 and the clutch 5, and FIG. 3B is an exploded perspective view of FIG. 3A. FIG. 5 is an explanatory diagram of a sliding hole portion 5c of the clutch 5. FIG. 5A shows a state in which the rotating drum 4 and the clutch 5 are attached to the winding member 3, and FIG. 5B shows a state in which the rotating drum 4 and the clutch 5 are removed from the winding member 3. 5A and 5B, for convenience of explanation, the winding member 3 is shown cut along a plane that is parallel to the axial direction and passes through the engaging protrusions 3d and 3e. FIG. 6A is a perspective view of the elevating shaft 21, the winding member 3, the rotating drum 4, and the clutch 5 in a state where the descent stop function is not exerted. In FIG. 6A, for convenience of explanation, the winding member 3, rotating drum 4, and clutch 5 are cut along a cross section perpendicular to the axial direction. In FIG. 6A, for convenience of explanation, a part of the brake cylinder part 3c of the winding member 3 is cut off so that the sliding protrusion 4a2 and the sliding hole part 5c can be seen (the broken line part corresponds to the cut part). ). FIG. 6B is a perspective view showing the sliding protrusion 4a2 sliding from the position shown in FIG. 6A through the play portion 5c2 of the sliding hole 5c and reaching the stepped portion t3. FIG. 6C is a perspective view showing how the sliding protrusion 4a2 slides through the sliding hole 5c from the position shown in FIG. 6A and reaches the other end t2 side. FIG. 6C shows a state in which the descent stop function is activated. FIG. 7A is a perspective view showing the clutch 5, rotating drum 4, play member 6, and winding member 3 according to the second embodiment. FIG. 7B is an exploded perspective view of FIG. 7A. In FIGS. 7A and 7B, for convenience of explanation, the winding member 3 is shown partially cut off. FIG. 8A is a side view of the clutch 5, rotating drum 4, and play member 6 according to the second embodiment. FIG. 8A shows a cross-sectional view of the play member 6 for convenience of explanation. FIG. 8B is a BB end view shown in FIG. 8A. FIG. 9A is a perspective view of a detection device 50 according to the third embodiment. FIG. 9B is a cross-sectional view of the detection device 50 in a plane passing through points P1 and P3 shown in FIG. 9A. FIG. 9B is a diagram of the detection device 50 viewed in the direction of arrow Ar shown in FIG. 9A. 9C shows that the slide member 1g shown in FIG. 9B moves from the disengaged position Ps1 (first position) to the engageable position Ps2 (second position), and the brake pawl 5d of the clutch 5 and the slide member 1g are engaged. It shows that the conditions match. FIG. 10A is a perspective view showing the lifting shaft 21, play member 6, and winding member 3 according to the third embodiment. In FIG. 10A, for convenience of explanation, illustration of a part of the winding member 3 is omitted, and the omitted part is schematically shown with a broken line. FIG. 10B is an exploded perspective view of the play member 6 and the take-up member 3.

Embodiments of the present invention will be described below. Various features shown in the embodiments described below can be combined with each other. Further, the invention can be realized independently for each feature.

1. First embodiment 1-1. Overall Configuration As shown in FIGS. 1A and 1B, a horizontal blind 100 (corresponding to a shielding device) is provided with a loop-shaped operating cord 19 hanging from a head box 10 installed in a building or the like. Although the operation cord 19 is a ball chain in the embodiment, it is not limited to this. The horizontal blind 100 includes a plurality of slats 15 (corresponding to shielding materials) extending in the horizontal direction. Then, in a state where the plurality of slats 15 are lowered from the head box 10, the plurality of slats 15 are arranged vertically.

The horizontal blind 100 includes a head box 10, a bracket (not shown), a pulley 12, a power transmission device (not shown), a slat 15, a lifting cord 16, a ladder cord 17, a bottom rail 18, and an operation It includes a cord 19, a lift shaft 21 (see FIGS. 6A to 6C), and a tilt shaft (not shown).

Note that a power transmission device (not shown) is provided within the head box 10 and is connected to the lift shaft 21 and the tilt shaft. This power transmission device has a function of transmitting input (rotation) from the pulley 12 to the lifting shaft 21 and the tilt shaft. Further, the lift shaft 21 and a tilt shaft (not shown) are provided inside the head box 10 and extend in the longitudinal direction of the head box 10. As the lifting shaft 21 rotates, a winding member 3 (corresponding to the winding member) described later rotates (see FIG. 2), and the lifting cord 16 is wound up and rewound to the winding member 3, and the tilt shaft The rotation causes a tilt drum (not shown) to rotate, the ladder cord 17 to be displaced, and the slat 15 to rotate.

As shown in FIG. 2, the horizontal blind 100 includes a detection device 50. The detection device 50 has a function of detecting that the bottom rail 18 has collided with an obstacle when the slat 15 and the bottom rail 18 are lowered (obstacle detection function), and a function of detecting that the bottom rail 18 has collided with an obstacle. It has a function of stopping the rotation of the elevating shaft 21 (descending stop function).

Here, the horizontal blind 100 includes three sets each of a support member 1, a tilt drum (not shown), a ladder cord 17, a winding member 3, and a lifting cord 16. Each set consisting of the support member 1, the tilt drum, the ladder cord 17, the winding member 3, and the elevating cord 16 is arranged so as to be lined up in the longitudinal direction of the head box 10. Note that the tilt drum is attached to each set of support members 1 described above.

Further, the horizontal blind 100 includes one set of a rotating drum 4 and a clutch 5 (see FIG. 2). This one set of rotating drum 4 and clutch 5 is provided in the central set of winding members 3 among the three sets of winding members 3 described above. In the embodiment, the detection device 50 includes a support member 1 , a winding member 3 , a rotating drum 4 , and a clutch 5 . The support member 1 and the winding member 3 of the detection device 50 correspond to the support member 1 and the winding member 3 of the central set among the three sets described above. The rotating drum 4 in the first embodiment corresponds to a rotating member.

A bracket (not shown) fixes the head box 10 to an object to be attached, such as an upper frame of a window. Thereby, the horizontal blind 100 is fixed to the object to be attached. A pulley 12 to which an operating cord 19 is hung is provided within the head box 10. When the operator operates the operation cord 19 to rotate the pulley 12, the rotation of the pulley 12 is transmitted to the tilt shaft and the lift shaft 21 via the power transmission device.

As shown in FIG. 1B, the slats 15 are suspended and supported by the head box 10. Specifically, as shown in FIG. 1B, the ladder cord 17 includes a pair of warp threads (a front warp thread 17f and a rear warp thread 17b) and a plurality of weft threads sandwiched between them, and the slat 15 is supported by each weft thread. ing. As shown in FIG. 1B, the front warp 17f and the rear warp 17b of the ladder cord 17 are each pulled out from the head box 10. The ladder cord 17 is attached to a tilt drum (not shown), and the ladder cord 17 is configured to be able to be displaced following the rotation of the tilt drum. That is, when the tilt drum is rotated, for example, counterclockwise when viewed from the right side, the front warp 17f is displaced to be pulled out downward, and the rear warp 17b is displaced so as to be pulled back upward. As a result, the slat 15 rotates so that its front edge 15f (corresponding to the first edge) faces downward. If the rotation direction of the tilt drum is reversed, the slat 15 rotates so that the rear edge 15b (corresponding to the second edge) faces upward.

As shown in FIG. 1B, the lifting cord 16 is pulled out from the head box 10. One end of the lifting cord 16 is attached to the winding member 3 (see FIG. 2), and the lifting cord 16 can be wound around and unwound onto the winding member 3. Furthermore, a bottom rail 18 is attached to the lower ends of the lift cord 16 and the ladder cord 17. When the lifting cord 16 is wound around the winding member 3, the slat 15 rises together with the bottom rail 18, and when the lifting cord 16 is wound back around the winding member 3, the slat 15 moves down together with the bottom rail 18.

1-2. Description of detection device 50
As shown in FIG. 2, the detection device 50 includes a support member 1, a winding member 3, a rotating drum 4, and a clutch 5.

The horizontal blind 100 includes three sets each of a support member 1, a tilt drum, a ladder cord 17, a winding member 3, and a lifting cord 16. In addition, although the embodiment has been described using an example in which three sets of these are provided, the present invention is not limited to this, and five or seven sets of these may be provided. Here, the central winding member 3 corresponds to a winding member, and the left and right winding members 3 correspond to a left winding member and a right winding member, respectively. In addition, the lifting cord 16 suspended from the central winding member 3 corresponds to the lifting cord, and the lifting cords 16 suspended from the left and right winding members 3 correspond to the left lifting cord and the right lifting cord, respectively. do. The rotating drum 4 and the clutch 5 are provided in the central winding member 3 among the three sets of winding members 3 described above.

The horizontal blind 100 is configured such that the slats 15 are lowered when the operation cord 19 is pulled down from the time when the bottom rail 18 is located at the uppermost position until the time when the bottom rail 18 is located at the lowermost position. be done. In other words, the horizontal blind 100 does not have a dead weight lowering function based on a clutch mechanism. In other words, the horizontal blind 100 is configured such that the user manually lowers the bottom rail 18 from the top to the bottom. Note that the dead weight lowering function is a function in which the slats 15 and the bottom rail 18 automatically lower to the lowest position when the user turns off the clutch of the clutch mechanism.

1-2-1. Support member 1
As shown in FIG. 2, the support member 1 includes a winding member accommodating portion 1a and a brake protrusion 1c. The brake protrusion 1c corresponds to a brake body.

As shown in FIG. 2, the winding member accommodating portion 1a is configured to be able to accommodate the winding member 3, and the winding member accommodating portion 1a is provided with shaft support portions 1a1 and 1a2. The shaft support part 1a1 is configured in an annular shape. The cylinder part 5a of the clutch 5 is inserted into the shaft support part 1a1, and the shaft support part 1a1 rotatably supports the cylinder part 5a. The shaft support part 1a2 is formed in the shape of a notch in the winding member accommodating part 1a, and the shaft support part 1a2 rotatably supports the cap part 3b of the winding member 3.

The brake protrusion 1c shown in FIG. 2 has a function of engaging the brake pawl 5d of the clutch 5 to stop the rotation of the lifting shaft 21. The braking protrusion 1c is provided at the lower part of the shaft support part 1a1.

1-2-2. Winding member 3
As shown in FIGS. 2 and 5B, the winding member 3 includes a winding part 3a, a cap part 3b, a brake cylinder part 3c, and a locking cylinder part 3f.

The winding member 3 is configured to be able to wind up and unwind the lifting cord 16. When the slat 15 is pulled up or down, the winding member 3 rotates together with the lifting shaft 21. On the other hand, when the bottom rail 18 hits an obstacle, the winding member 3 and the lifting shaft 21 can rotate relative to each other. The operation of the winding member 3 will be explained in detail later.

As shown in FIG. 2, the winding part 3a has a tapered shape that gradually becomes thinner from the distal end side (shaft support part 1a1 side) to the base end side (shaft support part 1a2 side). Therefore, the lifting cord 16 wound at the distal end side can easily move toward the proximal end side.
The cap portion 3b is engaged with the base end side of the winding portion 3a, and the cap portion 3b is rotatably supported by the shaft support portion 1a2.

As shown in FIGS. 2 and 5B, the brake cylinder part 3c is formed in a cylindrical shape, and the brake cylinder part 3c is connected to the distal end side of the winding part 3a. A clutch 5 is arranged inside the brake cylinder portion 3c. Furthermore, engaging protrusions 3d and 3e are formed inside the brake cylinder portion 3c. The engaging protrusions 3d, 3e are formed so as to protrude toward the center (axis) side of the brake cylinder part 3c, and the engaging protrusions 3d, 3e are formed so as to extend in the axial direction. The engaging protrusions 3d and 3e are inserted into the moving slit 5e of the clutch 5. Thereby, the winding member 3 engages with the clutch 5, and the winding member 3 and the clutch 5 can rotate together.

As shown in FIGS. 5A and 5B, the locking tube portion 3f is formed in a cylindrical shape, and the locking tube portion 3f is formed inside the winding portion 3a. A locking portion 4c of the rotating drum 4 is inserted into the locking tube portion 3f, and the locking tube portion 3f engages with this locking portion 4c.

1-2-3. Rotating drum 4
The rotating drum 4 includes a drum main body 4a, a regulating protrusion 4b, and a locking part 4c.

The drum body 4a is formed in a substantially cylindrical shape, and as shown in FIG. 6A, a regular hexagonal insertion hole 4a3 is formed in the center of the drum body 4a. An elevating shaft 21 having the same size and a hexagonal cross section is passed through the insertion hole 4a3, and the rotary drum 4 rotates together with the elevating shaft 21.
Two notches are formed in the drum body 4a along the axial direction, and arm portions 4a1 are formed by these notches. A sliding protrusion 4a2 that protrudes radially outward of the rotating drum 4 is formed at the tip of the arm portion 4a1. The sliding protrusion 4a2 is formed on the outer periphery of the drum body 4a. The rotating drum 4 is assembled so that the sliding protrusion 4a2 is accommodated inside the sliding hole 5c of the clutch 5, as shown in FIGS. 3A and 3B. The arm portion 4a1 has flexibility in the radial direction of the rotating drum 4, and when an operator assembles the rotating drum 4 inside the clutch 5, the tip of the arm portion 4a1 is attached to the rotating drum 4 together with the sliding protrusion 4a2. It is designed to bend toward the center. The sliding protrusion 4a2 has a substantially cylindrical shape and is formed to be slidable within the sliding hole 5c of the clutch 5.

As shown in FIGS. 3B and 6A, a regulating protrusion 4b that protrudes radially outward is formed on the locking portion 4c side of the drum body 4a. The regulating protrusion 4b is arranged at a position substantially opposite to the sliding protrusion 4a2 in the circumferential direction of the drum body 4a. Further, the regulating protrusion 4b is formed to extend within a predetermined angular range in the circumferential direction of the drum body 4a. When the rotating drum 4 rotates relative to the winding member 3, it comes into contact with the engagement protrusions 3d and 3e of the winding member 3. As shown in FIG. 6A, the rotating drum 4 is assembled to the winding member 3 such that the regulating projection 4b is disposed between the engaging projection 3d and the engaging projection 3e of the winding member 3. . Therefore, the rotating drum 4 and the winding member 3 can move relative to each other only within the range in which the regulating projection 4b moves between the engaging projection 3d and the engaging projection 3e of the winding member 3. .

The locking portions 4c are connected to the drum body 4a, and in the embodiment, the rotating drum 4 has three locking portions 4c. The distal end of the locking portion 4c is formed into a claw shape, and the locking portion 4c is configured to be able to engage with the locking cylinder portion 3f of the winding member 3. By engaging the locking portion 4c with the locking cylinder portion 3f of the winding member 3, the rotating drum 4 and the winding member 3 are prevented from moving relative to each other in the axial direction.

1-2-4. clutch 5
As shown in FIGS. 3A and 3B, the clutch 5 includes a cylindrical portion 5a and a braking portion 5b formed to have a larger diameter than the cylindrical portion 5a. The clutch 5 is formed into a substantially cylindrical shape. The clutch 5 is configured to be relatively movable in the axial direction of the winding member 3. In the embodiment, the clutch 5 is engaged with the rotating drum 4 so as to move relative to the winding member 3 in the axial direction as the rotating drum 4 rotates. Specifically, when the sliding protrusion 4a2 moves within the sliding hole 5c while contacting the edge of the sliding hole 5c of the clutch 5, which will be described later, the clutch 5 moves along the sliding protrusion 4a2 (rotating drum). 4), the winding member 3 is relatively moved in the axial direction.

The cylindrical portion 5a is inserted into and supported by the shaft support portion 1a1 of the support member 1. The cylindrical portion 5a is connected to the distal end side of the brake portion 5b.

The diameter of the outer peripheral surface of the brake part 5b is set to a size that allows it to slide on the inner peripheral surface of the brake cylinder part 3c of the winding member 3. A brake pawl 5d is formed at the end of the brake portion 5b on the cylindrical portion 5a side. The brake pawl 5d protrudes in a sawtooth shape toward the axial direction, and can engage with the brake protrusion 1c of the support member 1. The brake pawl 5d is prevented from rotating in the circumferential direction by engaging with the brake protrusion 1c, and the support member 1 and the clutch 5 are unable to rotate relative to each other. A plurality of brake pawls 5d are formed at equal angular intervals along the circumferential direction of the brake portion 5b.

As shown in FIGS. 3A and 3B, a sliding hole 5c and a moving slit 5e as a cam structure are formed in the side wall of the brake part 5b.

The sliding hole portion 5c has an inclined portion 5c1 and a play portion 5c2. The sliding hole portion 5c is formed with one end portion t1, the other end portion t2, and a stepped portion t3.
The inclined portion 5c1 extends from one end t1 to the other end t2 so as to be inclined with respect to the elevating shaft 21 (the central axis of the rotating drum 4). As shown in FIG. 4, the inclined portion 5c1 extends so as to be inclined with respect to the axis ax of the brake portion 5b. The central axis of the rotating drum 4 is located on the same straight line as the axis ax of the brake part 5b. Normally, the sliding protrusion 4a2 is located at one end t1. When the bottom rail 18 collides with an obstacle while the user is lowering the slat 15 by operating the operation cord 19, the rotating drum 4 rotates relative to the clutch 5, and the sliding protrusion 4a2 moves from the one end t1. Move to the other end t2 side.
The play portion 5c2 is provided on the one end t1 side of the inclined portion 5c1. Furthermore, the play portion 5c2 extends in the circumferential direction bx of the braking portion 5b of the clutch 5 along the rotational direction of the lifting shaft 21 (the rotating direction of the lifting shaft 21 when pulling down the slat 15). As described above, the inclined part 5c1 extends so as to be inclined with respect to the axis ax of the brake part 5b, but the play part 5c2 is not inclined with respect to the axis ax of the brake part 5b, and extends so as to be inclined with respect to the axis ax of the brake part 5b. Extends parallel to the direction of rotation. The play portion 5c2 extends from the one end portion t1 to the stepped portion t3.

The formation range of the play portion 5c2 extends in the circumferential direction bx of the braking portion 5b of the clutch 5. Here, the formation range of the play portion 5c2 corresponds to the non-transmission angle range. Even if the rotating drum 4 rotates within the range in which the play portion 5c2 is formed, the rotation of the rotating drum 4 is not transmitted to the clutch 5. More specifically, even if the rotating drum 4 rotates relative to the clutch 5 within the range in which the play portion 5c2 is formed, the clutch 5 does not move relative to the winding member 3 in the axial direction. Further, when the rotating drum 4 rotates relative to the clutch 5 beyond the range in which the play portion 5c2 is formed, the clutch 5 moves relative to the winding member 3 in the axial direction, and the clutch 5 engages with the braking protrusion 1c. match.

The moving slit 5e is formed along the axial direction of the brake portion 5b. As shown in FIGS. 3A and 3B, the moving slit 5e is formed to correspond to the positions of the engaging protrusions 3d and 3e of the winding member 3, and the engaging protrusions 3d and 3e are aligned with the moving slit 5e. , the clutch 5 and the winding member 3 are engaged with each other, and the clutch 5 and the winding member 3 are assembled so that they cannot rotate relative to each other and are movable relative to each other along the axial direction.
As the clutch 5 moves relative to the support member 1 (see FIGS. 6A and 6C), the brake pawl 5d engages with the brake protrusion 1c of the support member 1 (see FIG. 2), and the clutch 5 moves relative to the support member 1. Therefore, relative rotation becomes impossible. On the other hand, when the engagement between the brake pawl 5d and the brake protrusion 1c is released, the clutch 5 can rotate relative to the support member 1.

1-3. Operation explanation 1-3-1. Initial state when the operation code 19 is not operated When the operation code 19 is not operated, the states of the winding member 3, rotating drum 4, and clutch 5 are as shown in FIG. 6A. The state shown in FIG. 6A is also referred to as an initial state below.

The winding member 3 is engaged with the rotating drum 4 by the engaging protrusions 3 d and 3 e of the winding member 3 and the regulating protrusion 4 b of the rotating drum 4 engaging with each other. Since the elevating shaft 21 is inserted into the rotating drum 4, the rotating drum 4 rotates together with the elevating shaft 21. Here, since the bottom rail 18 and the slats 15 are suspended from the lifting cord 16, tension is applied to the lifting cord 16. Therefore, normally, a rotational force (torque) that lowers the bottom rail 18 and the slats 15 continues to act on the winding member 3. The rotational force of the winding member 3 is transmitted to the lifting shaft 21 via the rotating drum 4. More specifically, as shown in FIG. 6A, the engagement protrusion 3d of the winding member 3 engages with the regulating protrusion 4b of the rotating drum 4, so that the rotational force of the winding member 3 causes the rotating drum 4 to move. It will be transmitted to the lifting shaft 21 via.

Here, the elevating shaft 21 is connected to a power transmission device (not shown). A brake mechanism (not shown) is provided in the power transmission device to prevent the lifting shaft 21 from rotating even if rotational force due to the weight of the bottom rail 18 and the slats 15 acts on the lifting shaft 21. ing. In other words, normally, a rotational force (torque) that lowers the bottom rail 18 and slats 15 continues to act on the winding member 3, but unless the user operates the operation cord 19, the winding member 3 rotates. However, the lifting cord 16 is not rewound.

1-3-2. When pulling up the slats 15 When the user operates the operation cord 19 to pull up the slats 15 and the bottom rail 18, the lifting shaft 21 and the rotating drum 4 move from the initial state shown in FIG. 6A in the opposite direction to the R direction shown in FIG. 6A. Rotate in the direction. At this time, the regulating protrusion 4b of the rotating drum 4 pushes the engagement protrusion 3d of the winding member 3, and the engagement protrusion 3d pushes the brake part 5b. Therefore, the winding member 3, rotating drum 4, and clutch 5 rotate integrally in the direction opposite to the R direction. When the winding member 3 rotates in the direction opposite to the R direction, the lifting cord 16 is wound around the winding portion 3a of the winding member 3, and the slat 15 and the bottom rail 18 rise.

1-3-3. When pulling down the slat 15 1-3-3-1. Normal operation When the user operates the operation cord 19 to pull down the slats 15 and bottom rail 18, the elevating shaft 21 and the rotating drum 4 rotate in the R direction shown in FIG. 6A from the initial state shown in FIG. 6A. That is, the rotating drum 4 rotates in the R direction so that the regulating protrusion 4b escapes from the engaging protrusion 3d. However, as described above, the rotational force (torque) that lowers the bottom rail 18 and the slats 15 continues to act on the winding member 3. Therefore, when the regulating protrusion 4b tries to escape from the engaging protrusion 3d, the winding member 3 rotates in the R direction until the engaging protruding part 3d catches up with the regulating protruding part 4b. Note that since the winding member 3 is engaged with the clutch 5 through the engagement protrusions 3d and 3e, when the winding member 3 rotates, the clutch 5 similarly rotates in the R direction. That is, when the rotating drum 4 rotates in the R direction, the winding member 3 also rotates in the R direction, the lifting cord 16 is unwound from the winding part 3a of the winding member 3, and the slats 15 and bottom rail 18 are lowered. .

1-3-3-2. Operation of Obstacle Detection Function and Descent Stop Function Assume that when the user operates the operation cord 19 to pull down the slats 15 and the bottom rail 18, the bottom rail 18 collides with an obstacle. At this time, the bottom rail 18 rides on the obstacle, so the tension of the lifting cord 16 decreases. As a result, the rotational force (torque) that lowers the bottom rail 18 and the slats 15 no longer acts on the winding member 3, and the rotation of the winding member 3 in the R direction is stopped. On the other hand, since the user is operating the operation cord 19, the elevating shaft 21 and the rotating drum 4 continue to rotate in the R direction. As a result, the rotating drum 4 rotates relative to the winding member 3, and the rotating drum 4 shifts from the state shown in FIG. 6A to the state shown in FIG. 6C.

In the process of the rotating drum 4 transitioning from the state shown in FIG. 6A to the state shown in FIG. 6C, the sliding protrusion 4a2 moves from one end t1 to the other end while contacting the edge of the inclined part 5c1 of the sliding hole 5c. Move to part t2 side. Note that since the rotating drum 4 cannot move relative to the winding member 3 in the axial direction, the rotating drum 4 is only rotating and not moving in the axial direction. While the sliding protrusion 4a2 moves while contacting the edge of the inclined portion 5c1, the clutch 5 receives a force reaction from the sliding hole 5c, and the clutch 5 moves in the axial direction. In this manner, the rotating drum 4 rotates relative to the winding member 3 and the clutch 5 moves in the axial direction, thereby exerting the obstacle detection function of the detection device 50.

Then, when the rotating drum 4 rotates relative to the winding member 3 and the clutch 5 moves in the axial direction, the brake pawl 5d of the clutch 5 engages with the brake protrusion 1c (see FIG. 2), and the clutch 5 becomes unable to rotate. When the clutch 5 becomes unable to rotate, the regulating protrusion 4b of the rotating drum 4 abuts against the engagement protrusion 3e, as shown in FIG. 6C. Here, since the clutch 5 is not rotatable, the winding member 3 does not rotate in the R direction even if the regulating protrusion 4b pushes the engagement protrusion 3e. That is, the winding member 3 and the rotary drum 4 become unable to rotate in the R direction from the state shown in FIG. 6C. As a result, even if the user attempts to lower the slats 15 and bottom rail 18 by operating the operating cord 19, the winding member 3, rotating drum 4, and clutch 5 do not rotate. In this way, the restricting protrusion 4b and the engaging protrusion 3e engage with each other, thereby exerting the function of stopping the detection device 50 from descending.

1-3-3-3. Operation when the operation cord 19 is suddenly operated When the user suddenly operates the operation cord 19 when lowering the slat 15, the elevating shaft 21 and the rotating drum 4 suddenly rotate, and the winding member 3 is moved to the rotating drum 4. may not be able to follow sudden rotations. Since the winding member 3 is engaged with the clutch 5, if the winding member 3 cannot follow the rotation of the rotary drum 4 and a rotation delay occurs in the winding member, a rotation delay will also occur in the clutch 5. Become. As a result, the rotating drum 4 rotates relative to the clutch 5, as shown in FIG. 6B.

Here, since the sliding hole portion 5c has a play portion 5c2, even if the rotating drum 4 rotates relative to the clutch 5, the sliding protrusion 4a2 only moves from the one end portion t1 to the step portion t3 side. It is. At this time, since the sliding protrusion 4a2 is not moving along the inclined part 5c1, the clutch 5 does not receive the reaction of the force in the axial direction from the sliding protrusion 4a2, and the clutch 5 moves in the axial direction (relative movement). )do not. Therefore, in the embodiment, it is possible to prevent the descent stop function from being activated when the operation cord 19 is suddenly operated. Further, since the step portion t3 is formed in the sliding hole portion 5c, the sliding protrusion 4a2 is prevented from easily moving from the play portion 5c2 to the inclined portion 5c1.

1-4. Effects of embodiment 1-4-1. About the play part The sliding hole part 5c of the clutch 5 of the horizontal blind 100 according to the embodiment has a play part 5c2, so that when the user suddenly operates the operation cord 19, the lifting shaft 21 and the rotating shaft are rotated together with the same. Even if the rotating drum 4 suddenly rotates, the clutch 5 is prevented from moving in the axial direction, and as a result, it is possible to prevent the descending stop function from being performed against the user's will.

In addition, in the case where the sliding hole portion 5c of the clutch 5 does not include the play portion 5c2, it is conceivable to increase the weight of the bottom rail 18. With this means, as the tension of the lifting cord 16 increases, the winding member 3 can more easily follow the rapid rotation of the rotary drum 4. However, with this method, when the user pulls up the slats 15 and the bottom rail 18, the force increases, increasing the operational burden on the user.
Further, it is also possible to consider a method of increasing the reduction ratio of the power transmission device so that even if the user suddenly operates the operation cord 19, the amount of rotation of the elevating shaft 21 and the rotary drum 4 is suppressed. However, with this means, the amount of operation by the user increases during the pull-up and pull-down operations, increasing the user's operational burden.
In the horizontal blind 100 according to the embodiment, a play portion 5c2 is formed in the sliding hole 5c of the clutch 5, thereby preventing the descending stop function from being performed against the user's will. In other words, the horizontal blind 100 according to the embodiment can prevent the descent stop function from being performed against the user's will while not increasing the operational burden on the user.

1-4-2. Arrangement of the lifting cord 16 with respect to the slat 15 The lifting cord 16 is arranged so as to face the rear edge 15b. In other words, the lift cord 16 is arranged behind the rear edge 15b. That is, in the embodiment, a hole is formed in the center of the slat 15 in the lateral direction, and the lifting cord is not passed through the hole. This is because, with such a configuration, light leaks from the holes and the light-shielding properties of the slats 15 are reduced. Here, if the lifting cord 16 is arranged to face the rear edge 15b, the lifting cord 16 will come into contact with the rear edge 15b, and the load on the lifting cord 16 (due to the weight of the bottom rail 18) load) is dispersed to the ladder cord 17, and as a result, the rotational force (torque) acting on the winding member 3 is reduced. When this rotational force decreases, it becomes more difficult for the winding member 3 to follow the rapid rotation of the rotating drum 4, and the rotating drum 4 becomes more likely to rotate relative to the clutch 5. However, the sliding hole portion 5c of the clutch 5 of the horizontal blind 100 according to the embodiment has a play portion 5c2. For this reason, even if the horizontal blind 100 adopts a configuration in which the load of the lift cord 16 is distributed to the ladder cord 17 in order to avoid a reduction in light blocking performance, the descent stop function may not work against the user's will. It is possible to avoid being exposed.

In addition, the horizontal blind 100 can obtain the same effect even when the lifting cord 16 is arranged so as to face the front edge 15f.
Alternatively, a configuration may be adopted in which a hole is formed in the front edge 15f or the rear edge 15b of the slat 15 and the lifting cord 16 is passed through the hole. In this configuration, since the holes are formed at the edges of the slats 15, reduction in light shielding properties is suppressed. It is also effective to apply this embodiment to this configuration.
Although the light-shielding property of the horizontal blind 100 is reduced, in this embodiment, a hole may be formed in the center of the slat 15 in the lateral direction, and a lifting cord may be passed through the hole.

1-4-3. Arrangement of Detection Device 50 For example, some conventional horizontal blinds are equipped with detection devices at the left end and right end of the head box, respectively. Here, when the obstacle is on the right end side of the bottom rail, when the bottom rail collides with the obstacle, the bottom rail tilts around the obstacle. Then, when the left end side of the bottom rail 18 descends a predetermined distance h after the obstacle collides with the right end side of the bottom rail 18, the detection device on the left end side exhibits a descent stopping function. In other words, after the bottom rail collides with an obstacle, when the lifting cord is rewound by a predetermined distance h, the descent stopping function is activated.

The horizontal blind 100 according to the embodiment includes a detection device 50 at a position where the winding member 3 (center winding member 3) is provided between the left and right winding members 3. Here, if an obstacle hits, for example, the right end of the bottom rail 18, the left end of the bottom rail 18 must descend by twice the predetermined distance h after the obstacle hits the right end of the bottom rail 18. , the detection device 50 does not perform the descent stop function. This is because when the left end of the bottom rail 18 descends twice the predetermined distance h after the obstacle collides with the right end of the bottom rail 18, the center portion of the bottom rail 18 descends the predetermined distance h. In other words, the horizontal blind 100 according to the embodiment can suppress the effectiveness of the descent stop function.

1-5. Modification 1-5-1. Application to Various Shielding Devices In the embodiment, the shielding device is a horizontal blind, but the present invention is not limited to this. The detection device 50 of the embodiment can also be applied to, for example, a pleated screen.

1-5-2. Winding Drum and Tape-shaped Lifting Cord In the embodiment, a configuration is described in which the detection device 50 includes a winding member (winding member 3) having a tapered shape, but the present invention is not limited to this. do not have. For example, the horizontal blind 100 includes a tape-like lifting cord 16 instead of the string-like lifting cord 16, and the detecting device 50 uses a winding part that does not have a tapered shape instead of the winding member 3. A take-up drum (corresponding to the take-up member) may be provided. Note that the tape-shaped lifting cord 16 is thinner and wider than the string-shaped lifting cord 16 shown in the embodiment. Further, tape-shaped lifting cords 16 are wound around the winding drum in an overlapping manner. Even with this form, effects similar to those of the embodiment can be obtained.

1-5-3. Modification example of play part 1: Deformation of sliding protrusion
In the embodiment, the play portion 5c2 (sliding hole portion) is provided in the clutch 5, but the present invention is not limited to this. The function of the play part may be provided in the rotating drum 4 instead of the clutch 5. For example, with the following configuration, the rotary drum 4 can be provided with the function of a play section.
The sliding hole portion 5c does not have a play portion 5c2, but has an inclined portion 5c1. Further, the rotating drum 4 is configured such that the sliding protrusion 4a2 is elastically deformed when the sliding protrusion 4a2 comes into contact with the sliding hole 5c. Here, the sliding protrusion 4a2 can be made of a material that is easily elastically deformed. Moreover, a depression may be formed in the arm portion four a1 around the sliding protrusion four a2 so that the sliding protrusion four a2 is easily deformed.

1-5-4. Modification example 2 of play part: Rotating drum 4 includes a sliding hole part (play part)
In the embodiment, the rotary drum 4 has the sliding protrusion 4a2, and the clutch 5 has the sliding hole 5c (the inclined part 5c1 and the play part 5c2), but the present invention is not limited to this. do not have. The rotating drum 4 may have a sliding hole, and the clutch 5 may have a sliding protrusion. Specifically, the rotating drum 4 is formed with a sliding hole portion (an inclined portion and an idle portion). On the other hand, the rotating drum 4 is not formed with the sliding protrusion 4a2 or the arm portion 4a1. The play portion of the sliding hole portion of the rotary drum 4 is provided on the end side of the inclined portion, and extends in the circumferential direction of the rotary drum 4 along the rotational direction of the elevating shaft 21. Furthermore, a sliding protrusion that protrudes toward the center axis of the clutch 5 is formed on the inner circumferential surface of the clutch 5 . On the other hand, the clutch 5 does not have a sliding hole 5c formed therein. Even in such a form, the same effects as in the embodiment can be obtained.

2. Second Embodiment In the second embodiment, descriptions of contents common to the first embodiment will be omitted as appropriate, and different parts will be mainly described. In the first embodiment, the clutch 5 is provided with the play portion 5c2, but in the second embodiment, the clutch 5 is not provided with the play portion 5c2. The detection device according to the second embodiment further includes a play member 6. This play member 6 includes a play portion 6b.

2-1. Configuration Description The detection device according to the second embodiment includes a winding member 3, a rotating drum 4, a clutch 5, and a play member 6, as shown in FIGS. 7A and 7B. Although not shown, the detection device of the second embodiment includes the support member 1 similarly to the first embodiment. The rotating drum 4 and play member 6 in the second embodiment correspond to rotating members.

2-1-1. Winding member 3
As shown in FIG. 7B, the winding member 3 includes a locking protrusion 3g instead of the locking tube portion 3f (see FIG. 5B). The locking protrusion 3g is also formed at the inner peripheral portion of the connection portion between the winding portion 3a and the brake cylinder portion 3c of the winding member 3. The locking protrusion 3g is a portion that engages with the rotating drum 4. Otherwise, the configuration of the winding member 3 according to the second embodiment is the same as the configuration of the winding member 3 according to the first embodiment.

2-1-1. Rotating drum 4
As shown in FIGS. 7B and 8A, the rotating drum 4 further includes an engaging cylindrical portion 4d and an engaging portion 4e in addition to the drum body 4a and the regulating protrusion 4b. Note that the rotating drum 4 according to the second embodiment does not include the locking portion 4c described in the first embodiment.

As shown in FIG. 8A, the drum body 4a further includes a protrusion 4a4 and a surface 4a5. A plurality of protrusions four a4 are provided in the circumferential direction of the rotating drum 4. The surface portion 4a5 is formed at a stepped portion between a portion of the drum body 4a having a large outer diameter and a portion of the drum body 4a having a small outer diameter. A locking projection 3g (see FIG. 7B) of the winding member 3 is inserted between the projection portion four a4 and the surface portion four a5. As a result, the rotating drum 4 and the winding member 3 are engaged with each other, and the rotating drum 4 does not move relative to the winding member 3 in the axial direction.

The engaging cylinder portion 4d is connected to the drum body 4a, as shown in FIG. 8A, and the engaging cylinder portion 4d is inserted into the play member 6. A groove portion 4d1 is formed in the engaging cylinder portion 4d. The groove portion 4d1 is formed in an annular shape in the engagement cylinder portion 4d, and can be engaged with the play member 6. In the state where the groove portion 4d1 and the play member 6 are engaged, the rotating drum 4 and the play member 6 can rotate relative to each other.

As shown in FIG. 8A, the engaging portion 4e is configured to engage with a play portion 6b of a play member 6, which will be described later. As shown in FIG. 8B, the engaging portion 4e has first and second end surfaces 4e1 and 4e2. In normal times, the first end surface 4e1 is in contact with the play portion 6b. On the other hand, when an obstacle is detected, the second end surface 4e2 comes into contact with the play portion 6b.

2-1-2. clutch 5
As shown in FIG. 8A, the clutch 5 includes a cylindrical portion 5a and a braking portion 5b. Although the structure of the brake part 5b according to the second embodiment is different from the structure of the brake part 5b according to the first embodiment, the other parts are the same. Specifically, as shown in FIG. 8A, the sliding hole portion 5c of the brake portion 5b has an inclined portion 5c1, but does not have an idle portion 5c2. That is, in the second embodiment, the function of the play section is not performed by the clutch 5 but by the play member 6, which will be described later.

2-1-3. Play member 6
As shown in FIGS. 7B, 8A, and 8B, the play member 6 includes a play member main body 6a, a play portion 6b, and an engagement protrusion 6c.
In the first embodiment, the rotating drum 4 was configured to be able to rotate integrally with the lifting shaft 21, but in the second embodiment, the play member 6 is configured to be able to rotate integrally with the lifting shaft 21. That is, the elevating shaft 21 is inserted into the play member 6. The rotation of the lifting shaft 21 is directly transmitted to the play member 6.

As shown in FIG. 8A, the play member main body 6a is formed in a cylindrical shape, and the engaging cylinder portion 4d of the rotary drum 4 is rotatably inserted into the play member main body 6a. A play portion 6b and an engagement protrusion 6c are provided on the inner peripheral portion of the play member main body 6a. In the second embodiment, the play portion 6b and the engagement protrusion 6c are integrally formed with the play member main body 6a.

The play portion 6b protrudes toward the center (central axis) of the play member 6, as shown in FIG. 7B. The play portion 6b is formed at the entrance portion of the play member main body 6a on the side into which the engagement cylinder portion 4d of the rotary drum 4 is inserted. The play member 6 rotates relative to the rotating drum 4 within a range 6b1 (see FIG. 8B) in which the play portion 6b is not formed. Furthermore, when the play member 6 rotates relative to the rotating drum 4 beyond the range 6b1 in which the play portion 6b is not formed, the play member 6 rotates integrally with the rotary drum 4, and the clutch 5 engages the winding member 3. The clutch 5 is moved relative to the brake protrusion 1c in the axial direction, and the clutch 5 engages with the brake protrusion 1c. A range 6b1 in which the play portion 6b is not formed corresponds to a non-transmission angle range.

The engagement protrusion 6c protrudes toward the center (central axis) of the play member 6, as shown in FIG. 8A. The engagement protrusion 6c is inserted into the groove 4d1 of the rotating drum 4. By inserting the engaging protrusion 6c into the groove 4d1, the engaging protrusion 6c and the groove 4d1 engage with each other. Although the rotating drum 4 and the play member 6 can rotate relative to each other, the rotating drum 4 and the play member 6 do not move relative to each other in the axial direction.

2-2. Operation explanation 2-2-1. When the slat 15 is pulled up, the operation will be explained with reference to FIG. 1 described in the first embodiment. When the user operates the operation cord 19 shown in FIG. 1 to pull up the slat 15 and the bottom rail 18, the lifting shaft 21 and the play member 6 rotate in the direction opposite to the R direction shown in FIG. 8B. At this time, the play part 6b of the play member 6 pushes the engagement part 4e of the rotary drum 4, so that the rotary drum 4 rotates in the direction opposite to the R direction, and the regulating protrusion 4b of the rotary drum 4 pushes the engagement part 4e of the rotary drum 4. 3, and the engaging protrusion 3d also pushes the brake part 5b. Therefore, the winding member 3, rotating drum 4, clutch 5, and play member 6 rotate integrally in the direction opposite to the R direction.

2-2-2. When pulling down the slat 15 2-2-3-1. Normal operation When the user operates the operation cord 19 shown in FIG. 1 to pull down the slat 15 and bottom rail 18, the lifting shaft 21 and the play member 6 rotate in the R direction shown in FIG. 8B. That is, the play member 6 rotates in the R direction so that the play part 6b escapes from the engagement part 4e. Here, a rotational force (torque) that lowers the bottom rail 18 and the slats 15 continues to act on the winding member 3. Therefore, when the play part 6b tries to escape from the engagement part 4e, the winding member 3 rotates in the R direction until the engagement part 4e catches up with the play part 6b.

2-2-3-2. Operation of Obstacle Detection Function and Descent Stop Function Assume that when the user operates the operation cord 19 to pull down the slats 15 and the bottom rail 18, the bottom rail 18 collides with an obstacle. At this time, the bottom rail 18 rides on the obstacle, so the tension of the lifting cord 16 decreases. As a result, the rotational force (torque) that lowers the bottom rail 18 and the slats 15 no longer acts on the winding member 3, and the rotation of the winding member 3 in the R direction is stopped. On the other hand, since the user is operating the operation cord 19, the elevating shaft 21 and the play member 6 continue to rotate in the R direction. As the play member 6 rotates, the play portion 6b shown in FIG. 8B rotates and moves from the position of the first end surface 4e1 to the position of the second end surface 4e2, and the play portion 6b comes into contact with the second end surface 4e2. As a result, the play member 6 rotates in the R direction together with the rotating drum 4.

When the rotating drum 4 rotates in the R direction, the sliding protrusion 4a2 (see FIG. 8A) of the rotating drum 4 moves from one end of the sliding hole 5c to the other end while contacting the edge of the sliding hole 5c. Move to the side. While the sliding protrusion 4a2 moves while contacting the edge of the inclined portion 5c1, the clutch 5 receives a force reaction from the sliding hole 5c, and the clutch 5 moves in the axial direction. In this manner, the rotating drum 4 rotates relative to the winding member 3 and the clutch 5 moves in the axial direction, thereby exerting the obstacle detection function of the detection device 50. Then, when the rotating drum 4 rotates relative to the winding member 3 and the clutch 5 moves in the axial direction, the brake pawl 5d of the clutch 5 engages with the brake protrusion 1c (see FIG. 2), and the clutch 5 becomes unable to rotate, and the detection device 50 functions to stop the descent.

2-2-3-3. Operation when the operation cord 19 is suddenly operated When the user suddenly operates the operation cord 19 when lowering the slat 15, the lifting shaft 21 and the play member 6 suddenly rotate, and the rotating drum 4 moves from the play member 6. It may become impossible to follow sudden rotations. However, even when the play portion 6b rotates, there is a delay (play) until the play portion 6b contacts the second end surface 4e2 of the engaging portion 4e of the rotating drum 4. Therefore, even if the play member 6 suddenly rotates, the rotating drum 4 is prevented from rotating together with the play member 6 at that time. That is, since the rotating drum 4 is not rotating, the clutch 5 moves in the axial direction, and the brake pawl 5d of the clutch 5 does not come into contact with the brake protrusion 1c.

2-3. Effects of the second embodiment The second embodiment has the same effects as the first embodiment.

3. Third Embodiment In the third embodiment, descriptions of common contents with the first embodiment will be omitted as appropriate, and different parts will be mainly described.
In the first embodiment, the clutch 5 is provided with the play portion 5c2, but in the third embodiment, the clutch 5 is not provided with the play portion 5c2, as in the second embodiment. The detection device according to the third embodiment further includes a play member 6, and the play member 6 includes a play part 6b.
Further, in the third embodiment, the rotating drum 4 described in the first and second embodiments is not provided, and instead, the winding member 3 is provided with an inner cylindrical portion 3h.

3-1. Configuration description The detection device 50 according to the third embodiment includes a support member 1, a winding member 3, a clutch 5, and a play member 6, as shown in FIGS. 9A, 10A, and 10B. . The play member 6 in the third embodiment corresponds to a rotating member.

3-1-1. Support member 1
As shown in FIGS. 9A to 9C, the support member 1 includes a base portion 1d, first and second support portions 1e and 1f, a slide member 1g, and an elastic member 1h.

As shown in FIG. 9A, first and second support parts 1e and 1f are erected on the base part 1d. Further, a slide member 1g is slidably provided on the base portion 1d. As shown in FIG. 9B, an open part 1d1 is formed in the base part 1d, and the lifting cord (not shown) is passed from the winding member 3, through the open part 1d1 of the support member 1, and from the support member 1. It also hangs downward.

The first support portion 1e rotatably supports the winding member 3. Furthermore, a groove (not shown) is formed in the first support portion 1e, into which the spiral groove of the winding member 3 is inserted. Thereby, by rotating the winding member 3, the winding member 3 can be moved in the axial direction. The second support part 1f rotatably supports the clutch 5. On the other hand, the second support part 1f supports the clutch 5 so that the clutch 5 does not move in the axial direction.

As shown in FIG. 9B, an insertion hole 1g1 is formed in the slide member 1g, and a lifting cord (not shown) is inserted into the insertion hole 1g1. Further, the slide member 1g has a brake protrusion 1g2, and the brake protrusion 1g2 engages with a brake pawl 5f of the clutch 5, which will be described later. The brake protrusion 1g2 corresponds to a brake body. As shown in FIGS. 9B and 9C, the slide member 1g can slide between a non-engaging position Ps1 (first position) and an engaging position Ps2 (second position). As shown in FIG. 9C, when the slide member 1g is located at the non-engaged position Ps1, even if the clutch 5 rotates, the clutch 5 cannot engage with the slide member 1g. On the other hand, as shown in FIG. 9B, when the slide member 1g moves to the engageable position Ps2, the clutch 5 rotates, so that the brake pawl 5f of the clutch 5 can engage with the brake protrusion 1g2 of the slide member 1g. be.

The elastic member 1h can be composed of, for example, a spring. The elastic member 1h engages with the slide member 1g so as to press the slide member 1g in a direction from the non-engaging position Ps1 toward the engageable position Ps2. One end of the elastic member 1h is provided on the base portion 1d, and the other end of the elastic member 1h is provided on the slide member 1g.

3-1-2. Winding member 3
As shown in FIG. 10B, the winding member 3 includes a winding portion 3a and an inner cylindrical portion 3h. The winding portion 3a has a spiral groove formed therein, and this spiral groove can wind up the lifting cord. Unlike the first and second embodiments, the winding member 3 is movable in the axial direction. By moving the winding member 3 toward the clutch 5 side, the winding member 3 enters into the clutch 5. The winding member 3 is provided so as to be able to engage with the play member 6.

As shown in FIGS. 10A and 10B, the inner cylinder portion 3h is arranged inside the winding portion 3a. The inner cylinder portion 3h includes a groove portion 3h1 and an engaging portion 3h2.
The function of the groove portion 3h1 is similar to the function of the groove portion 4d1 of the rotating drum 4 described in the second embodiment. The groove portion 3h1 is formed in an annular shape in the inner cylindrical portion 3h, and can be engaged with the play member 6. In the state where the groove portion 3h1 and the play member 6 are engaged, the winding member 3 and the play member 6 can rotate relative to each other.
The function of the engaging portion 3h2 is similar to that of the engaging portion 4e of the rotating drum 4 described in the second embodiment. The engaging portion 3h2 is configured to engage with the play portion 6b of the play member 6. The engaging portion 3h2 has a first end surface 3h21 (see FIG. 10B) and a second end surface (not shown) similarly to the engaging portion 4e of the second embodiment.

3-1-3. clutch 5
The clutch 5 is a cylindrical member formed to accommodate the winding member 3. The clutch 5 is configured to rotate together with the winding member 3. The end portion of the winding member 3 is formed in a polygonal shape, and the inner peripheral portion of the clutch 5 is also formed in a polygonal shape corresponding to the polygonal shape. Thereby, the rotation of the winding member 3 is transmitted to the clutch 5. As shown in FIG. 9B, a brake pawl 5d is formed on the clutch 5, and the brake pawl 5d is formed to be able to engage with the slide member 1g.

3-1-4. Play member 6
The configuration of the play member 6 is similar to the configuration of the play member 6 described in the second embodiment. As shown in FIGS. 10A and 10B, the play member 6 includes a play member main body 6a, a play portion 6b, and an engagement protrusion (see engagement protrusion 6c in FIG. 8A). Further, the play member 6 is configured to rotate integrally with the elevating shaft 21, similarly to the second embodiment. Note that in the third embodiment, the play member 6 is engaged with the inner cylindrical portion 3h of the winding member 3.

The play member 6 rotates relative to the winding member 3 within a range 6b1 (see FIG. 10B) where the play portion 6b is not formed. Further, when the play member 6 rotates relative to the winding member 3 beyond the range 6b1 where the play part 6b is not formed, the play member 6 rotates integrally with the winding member 3 and the clutch 5, and the clutch 5 slides. It engages with the member 1g (braking protrusion 1g2). A range 6b1 in which the play portion 6b is not formed corresponds to a non-transmission angle range.

3-2. Operation explanation 3-2-1. When the slat 15 is pulled up, the operation will be explained with reference to FIG. 1 described in the first embodiment. When the user operates the operation cord 19 shown in FIG. 1 to pull up the slat 15 and the bottom rail 18, the elevating shaft 21 and the play member 6 rotate in a direction opposite to the R direction shown in FIGS. 10A and 10B. At this time, the play part 6b of the play member 6 pushes the engagement part 3h2 of the inner cylinder part 3h, so that the inner cylinder part 3h rotates in the direction opposite to the R direction. Thereby, the winding member 3, the clutch 5, and the play member 6 rotate integrally in the direction opposite to the R direction.

3-2-2. When pulling down the slat 15 3-2-3-1. Normal operation When the user operates the operation cord 19 shown in FIG. 1 to pull down the slat 15 and bottom rail 18, the lifting shaft 21 and the play member 6 rotate in the R direction shown in FIGS. 10A and 10B. In other words, the play member 6 rotates in the R direction so that the play portion 6b escapes from the engagement portion 3h2. Here, a rotational force (torque) that lowers the bottom rail 18 and the slats 15 continues to act on the winding member 3. Therefore, when the play part 6b tries to escape from the engagement part 3h2, the winding member 3 rotates in the R direction until the engagement part 3h2 catches up with the play part 6b.

3-2-3-2. Operation of Obstacle Detection Function and Descent Stop Function It is assumed that when the user operates the operation cord 19 shown in FIG. 1 to pull down the slats 15 and the bottom rail 18, the bottom rail 18 collides with an obstacle. At this time, the bottom rail 18 rides on the obstacle, so the tension of the lifting cord 16 decreases.
When tension is applied to the lifting cord 16, the lifting cord 16 is in contact with the peripheral edge of the insertion hole 1g1 of the slide member 1g, and the sliding member 1g is pressed to the non-engaging position Ps1 by the lifting cord 16. ing. However, when the tension of the lifting cord 16 decreases, the slide member 1g receives the force of the elastic member 1h and moves from the non-engaging position Ps1 to the engaging position Ps2. In this way, by moving the slide member 1g from the non-engaging position Ps1 to the engaging position Ps2, the obstacle detection function of the detection device 50 is exhibited.

Further, when the tension of the lifting cord 16 decreases, the rotational force (torque) that lowers the bottom rail 18 and the slat 15 no longer acts on the winding member 3, and the rotation of the winding member 3 in the R direction is stopped. On the other hand, since the user is operating the operation cord 19, the elevating shaft 21 and the play member 6 continue to rotate in the R direction. Similarly to the second embodiment, when the play member 6 rotates, the play part 6b rotates, and from the position of the first end face 3h21 (see FIG. 10B) of the engagement part 3h2 to the position of the second end face (not shown). position, and the play portion 6b comes into contact with the second end surface. As a result, the play member 6 rotates in the R direction together with the winding member 3 (inner cylindrical portion 3h).

Since the winding member 3 and the clutch 5 rotate together, when the winding member 3 rotates in the R direction, the clutch 5 rotates together with the winding member 3. Since the slide member 1g has moved from the disengaged position Ps1 to the engageable position Ps2, when the clutch 5 rotates, the brake pawl 5d of the clutch 5 engages with the brake protrusion 1g2 of the slide member 1g, and the clutch 5 becomes unable to rotate, and the detection device 50 functions to stop the descent.

3-2-3-3. Operation when the operation cord 19 is suddenly operated When the user suddenly operates the operation cord 19 when lowering the slat 15, the lifting shaft 21 and the play member 6 suddenly rotate, and the inner cylinder part of the winding member 3 3h may not be able to follow the sudden rotation of the play member 6. However, even if the play portion 6b rotates, there is a delay (play) until the play portion 6b contacts the second end surface of the engagement portion 3h2 of the inner cylinder portion 3h. Therefore, even if the play member 6 suddenly rotates, the winding member 3 and the clutch 5 are prevented from rotating together with the play member 6 at that time.

3-3. Effects of the third embodiment The second embodiment has the same effects as the first embodiment.

4. Other Embodiments In the first to third embodiments and modified examples, the shielding device is operated manually (operation code 19), but the present invention is not limited to this embodiment. Even if the shielding device is electrically operated, the configurations of the first to third embodiments and modifications are useful.

When the shielding device operates electrically, the lift shaft 21 and the tilt shaft are driven by a motor. Here, when the motor drives the lifting shaft 21, the lifting cord 16 is unwound from the winding member 3, and the slats 15 and the bottom rail 18 are descending, the more the slats 15 and the bottom rail 18 descend, the more The load of the lifting cord 16 is easily transferred to the ladder cord 17. In other words, the lower the slats 15 and the bottom rail 18 are, the lower the tension of the lifting cord 16 is.
Furthermore, as the slats 15 and the bottom rail 18 descend, the contact area between the lifting cord 16 and the ladder cord 17 increases, and the frictional resistance between the lifting cord 16 and the ladder cord 17 increases, causing the slat 15 and the bottom rail 18 to lower. This may prevent the tension of the lifting cord 16 from further decreasing. Note that this decrease in tension may occur if the lifting cord 16 is arranged to face the front edge or rear edge of the slat 15 or if the lifting cord 16 touches the front edge or rear edge of the slat 15. This is likely to occur in shielding devices that have a form of penetration.
In the electrically operated shielding device, the slats 15 and the bottom rail 18 are moved up and down relatively slowly and at a constant speed. That is, the vertical movement of the bottom rail 18 and the like in an electrically operated shielding device is slower than the vertical movement of the bottom rail 18 and the like in a manually operated shielding device. Therefore, in the electrically operated shielding device, the obstacle detection function of the detection device 50 is suppressed even though the bottom rail 18 is not in contact with the obstacle, due to the decrease in the tension of the lifting cord 16 due to the descent described above. is likely to be exhibited.

Therefore, by providing the electrically operated shielding device with the detection device 50 described in the first to third embodiments and modified examples, it is possible to prevent the detection device 50 from failing even when the bottom rail 18 is not in contact with an obstacle. It is possible to prevent the object detection function from being activated.

1 : Support member 1a : Winding member storage part 1a1 : Shaft support part 1a2 : Shaft support part 1c : Braking protrusion (braking body)
1d: Base portion 1d1: Opening portion 1e: First support portion 1f: Second support portion 1g: Slide member 1g1: Through hole 1g2: Braking protrusion (braking body)
1h : Elastic member 3 : Winding member 3a : Winding part 3b : Cap part 3c : Brake cylinder part 3d : Engagement protrusion 3e : Engagement projection 3f : Locking cylinder part 3g : Locking projection 3h : Inner cylinder Part 3h1 : Groove part 3h2 : Engaging part 3h21 : First end face 4 : Rotating drum 4a : Drum body 4a1 : Arm part 4a2 : Sliding protrusion 4a3 : Insertion hole 4a4 : Protrusion part 4a5 : Surface part 4b : Regulation protrusion 4c : Locking portion 4d: Engagement tube portion 4d1: Groove portion 4e: Engagement portion 4e1: First end surface 4e2: Second end surface 5: Clutch 5a: Cylindrical portion 5b: Braking portion 5c: Sliding hole portion 5c1: Inclined portion 5c2: Playing portion 5d: Braking claw 5e: Moving slit 6: Playing member 6a: Playing member main body 6b: Playing portion 6b1: Range 6c: Engagement protrusion 10: Head box 12: Pulley 15: Slat 15b: Rear edge 15f: Front edge 16: Lifting cord 17: Ladder cord 17b: Rear warp 17f: Front warp 18: Bottom rail 19: Operation cord 21: Lifting shaft 50: Detection device 100: Horizontal blind ax: Axis bx: Circumferential direction t1: One end Part t2: Other end part t3: Step part

Claims (10)

Comprising a winding member, a rotating drum, and a clutch,
The winding member is configured to be able to wind up and unwind the lifting cord,
The rotating drum is configured such that its movement in the axial direction is restricted with respect to the winding member, and is rotatable relative to the winding member within a predetermined angular range. When the range is exceeded, it rotates integrally with the winding member,
The clutch is configured to rotate integrally with the winding member and to be movable relative to the winding member in an axial direction by rotation of the rotating drum,
One of the clutch and the rotating drum is provided with a play part,
The detection device is configured such that the play portion is configured so that the clutch does not move relative to the winding member in an axial direction even when the rotating drum rotates. The detection device according to claim 1,
One of the clutch and the rotating drum has a sliding hole,
The other of the clutch and the rotating drum has a sliding protrusion,
The sliding hole has an inclined part and the play part, and the sliding protrusion is inserted into the sliding hole,
The inclined portion extends so as to be inclined with respect to the central axis of the rotating drum,
In the detection device, the play portion is provided on an end side of the inclined portion and extends in a circumferential direction along a rotation direction of the rotary drum. Comprising a winding member, a rotating member, a clutch, an elevating shaft, an elevating cord, and a braking body,
The winding member is configured to be able to wind up and unwind the lifting cord,
The rotating member is configured to rotate together with the elevating shaft,
The clutch is configured to be able to rotate integrally with the winding member, and the clutch is engageable with the braking body so that the lifting shaft does not rotate in the rewinding direction of the lifting cord,
When the clutch engages the brake body, rotation of the lifting shaft is directly or indirectly transmitted from the rotating member to the clutch,
At least one of the winding member, the rotating member, and the clutch is provided with an idle portion,
The play portion is configured to prevent rotation of the rotating member from directly or indirectly being transmitted to the clutch even if the rotating member rotates within a predetermined non-transmission angle range. 4. The shielding device according to claim 3,
The rotating member has a rotating drum,
The rotating drum is configured to rotate integrally with the lifting shaft, is configured to be restricted from moving in the axial direction with respect to the winding member, and has a predetermined movement relative to the winding member. is capable of relative rotation within an angular range, and rotates integrally with the winding member beyond that range;
The clutch is configured to move relative to the winding member in an axial direction due to relative rotation between the clutch and the rotating drum and to be able to engage with the brake body,
The play portion is provided on one of the clutch and the rotating member,
The play part is
Even if the rotating drum rotates relative to the clutch within the non-transmission angle range, the clutch is configured not to move relative to the winding member in the axial direction , and
When the rotating drum rotates relative to the clutch beyond the non-transmission angle range, the clutch moves relative to the winding member in the axial direction , so that the clutch engages the brake body. consisting of a shielding device. 5. The shielding device according to claim 4,
One of the clutch and the rotating drum has a sliding hole,
The other of the clutch and the rotating drum has a sliding protrusion,
The sliding hole has an inclined part and the play part, and the sliding protrusion is inserted into the sliding hole,
The inclined portion extends so as to be inclined with respect to the central axis of the rotating drum,
The said play part is provided in the edge part side of the said inclined part, and is extended in the circumferential direction so that the rotation direction of the said rotating drum may be followed. 4. The shielding device according to claim 3,
The rotating member has a rotating drum and a play member,
The rotating drum is configured such that its movement in the axial direction is restricted with respect to the winding member, and is rotatable relative to the winding member within a predetermined angular range. When the range is exceeded, it rotates integrally with the winding member,
The clutch is configured to move relative to the winding member in an axial direction by rotation of the rotating drum and to be able to engage with the brake body,
The play member has the play part and is configured to rotate together with the lifting shaft,
The play part is
The play member is configured to rotate relative to the rotating drum within the non-transmission angle range, and
When the play member rotates relative to the rotating drum beyond the non-transmission angle range, the play member rotates integrally with the rotating drum, and the clutch moves relative to the winding member in the axial direction. . A shielding device, wherein the clutch is configured to engage the brake body. 4. The shielding device according to claim 3,
The winding member and the clutch are configured to rotate together,
The rotating member has a play member,
The braking body is movable to first and second positions, in the first position the braking body is disengageable with the clutch, and in the second position the braking body is engageable with the clutch. ,
The play member has the play portion, is configured to rotate integrally with the lifting shaft, and is configured to be restricted from moving in the axial direction with respect to the winding member,
The play portion is configured such that when the brake body is located in the second position,
The play member is configured to rotate relative to the winding member within the non-transmission angle range, and
When the play member rotates relative to the take-up member beyond the non-transmission angle range, the play member rotates together with the take-up member and the clutch, so that the clutch engages the brake body. A shielding device consisting of: The shielding device according to any one of claims 3 to 7,
It further includes an operation cord and a bottom rail,
The elevating shaft is configured to rotate when the operating code is operated,
The shielding is configured such that the bottom rail is lowered by a pull-down operation on the operation cord from when the bottom rail is located at the uppermost position to when the bottom rail is located at the lowermost position. Device. The shielding device according to any one of claims 3 to 8,
Further equipped with shielding material,
The shielding material is a slat,
the slat has first and second edges, the first and second edges extending in the longitudinal direction of the slat;
The shielding device, wherein the lifting cord passes through the first edge or the second edge or is arranged to face the first edge or the second edge. The shielding device according to any one of claims 3 to 8,
Further comprising a head box, a right side winding member, a left side winding member, a right side lifting cord, and a left side lifting cord,
The right side winding member is configured to be able to wind up and unwind the right side lifting cord as the lifting shaft rotates, and the left side winding member rotates the left side lifting cord as the lifting shaft rotates. Constructed so that the cord can be wound up and unwound,
The head box is equipped with the winding member, the right winding member, and the left winding member,
The said winding member is a shielding device arrange|positioned between the said right winding member and the said left winding member.