JP6817036B2 - Cloaking device - Google Patents

Description

The present invention relates to a cloaking device, and more particularly to a cloaking device including a braking device that can be used to appropriately slow down the movement of the lifting cord.

Conventionally, there is a shielding device that pulls up a shielding member by pulling an elevating cord and lowers the shielding member by its own weight. Some such shielding devices are provided with a braking device that decelerates the movement of the elevating cord, and can reduce the momentum of the shielding member descending. For example, Patent Document 1 discloses a braking device (brake device) in which a movable pulley and a fixed pulley form a pair of sandwiching bodies, and the movable pulley approaches the fixed pulley to suppress the moving speed of the elevating cord. There is.

JP-A-10-140950

However, in the shielding device as described in the above cited document 1, the shielding member may be tilted during the ascending / descending operation.

The present invention has been made in view of such circumstances, and provides a braking device capable of suppressing the inclination of the shielding member.

According to the present invention, the shielding device includes a plurality of elevating cords, a shielding member that elevates and lowers with the movement of the plurality of elevating cords, and a braking device that applies a braking force to the plurality of elevating cords. Provided is a shielding device provided with individual resistance applying means for individually applying resistance to the movement of each of the plurality of elevating cords for each elevating cord.

The present inventors have conducted diligent studies in order to obtain a shielding device capable of suppressing the inclination of the shielding member, and found that the cause of the inclination of the shielding member is that the braking device brakes a plurality of elevating cords. It was found that the braking force for each lifting cord of the braking device was different. Therefore, he came up with the idea of providing individual resistance-imparting means for individually giving resistance to the movement of each of the plurality of elevating cords, and completed the present invention. With this configuration, even when the braking force of each lifting cord by the braking device is different, the braking force for each cord can be adjusted, and the inclination of the shielding member can be suppressed.

Hereinafter, various embodiments of the present invention will be illustrated. The embodiments shown below can be combined with each other.

Preferably, the braking device includes a pair of narrowing members that collectively sandwich the plurality of elevating cords.

Preferably, the pair of sandwiching members has a second sandwiching position in which the plurality of lifting cords are sandwiched, and a second sandwiching member in which the distance between the pair of sandwiching members is narrower than that in the first sandwiching state. It is movable to and from the pinching position, and the braking device is configured to apply a braking force to the elevating cord when the pair of pinching members are in the second pinching position.

Preferably, the plurality of elevating cords are hung down and a head box for holding the braking device is provided, the individual resistance applying means is arranged corresponding to each elevating cord, and each elevating cord is placed in the head box. Each of the guide members has a different resistance force to each of the corresponding elevating cords.

Preferably, the guide member is a guide pulley that is rotatably supported by the head box and rotates with the movement of the elevating cord.

Preferably, the guide pulley is configured to give a rotational resistance to the rotation of the guide pulley, and the rotational resistance gives resistance to the movement of the elevating cord.

Preferably, the guide pulley is configured to be provided with rotational resistance by a damper, and the resistance of the damper is made different for each guide pulley corresponding to each elevating cord.

Preferably, the guide pulley is formed so as to have a different diameter for each of the corresponding elevating cords, and the resistance applied to each of the elevating cords is made different due to the difference in the diameter.

Preferably, the braking device includes a housing, and the individual resistance applying means is a groove formed in the housing corresponding to each elevating cord and passing each elevating cord, and the groove is each elevating and lowering. The resistance given to the cord was different.

Preferably, the groove is a through hole formed in the housing corresponding to each elevating cord and through which each elevating cord is passed, and resistance given to each elevating cord by making the diameter of each through hole different. The powers were different.

Preferably, each of the through holes is substantially circular and is connected to share a portion of the circle.

Further, according to the invention, it is a shielding device including a plurality of elevating cords and a shielding member that elevates and elevates with the movement of the plurality of elevating cords, and individually resists the movement of each of the plurality of elevating cords. A shielding device is provided, which is provided with individual resistance applying means for each elevating cord.

It is a front view which shows the shielding device which concerns on 1st Embodiment of this invention. It is an exploded perspective view of the braking device of the shielding device of FIG. 2 is an assembly view of the braking device of FIG. 2, where FIG. 2A is a front perspective view, FIG. 2B is a rear perspective view, and FIG. 2C is a left side view. 2 is an assembly view of the braking device of FIG. 2, where FIG. 2A is a plan view and FIG. 2B is a bottom view. It is an assembly drawing which removed the case from the braking device of FIG. 2, (a) is a front perspective view, (b) is a rear perspective view. It is an assembly drawing which further removed the slider from FIG. 4A, FIG. 4A is a front perspective view, and FIG. 4B is a rear perspective view. FIG. 3C is a cross-sectional view taken along the line AA of FIG. 3 (c). FIG. 4A is a cross-sectional view taken along the line BB of FIG. 4A. 7A and 7B are views showing how the braking device of FIG. 2 brakes the elevating cord. FIG. 7A shows a state in which no tension is applied to the elevating cord (steady state), and FIG. 7B shows tension on the elevating cord. Is given, and the elevating cord is sandwiched between a pair of sandwiching members (pinching state), and (c) is a diagram summarizing the rotation directions of each member when the state changes from (a) to (b). Is. It is a figure which shows the operation of the braking device of FIG. It is a schematic view which shows the guide pulley arranged in the head box of the shielding device of FIG. 1, (a) is a plan view, (b) is a front view. It is explanatory drawing which shows the state which the shielding member of the shielding device of FIG. 1 is inclined. It is a figure which shows the braking device of the shielding device which concerns on 2nd Embodiment of this invention, (a) is a front perspective view, (b) is a rear perspective view, (c) is a front view which shows a through hole.

Hereinafter, preferred embodiments of the shielding device according to the present invention will be described in detail with reference to the drawings.

1 First Embodiment 1-1 Overall Configuration As shown in the front view of FIG. 1, the shielding device 100 according to the first embodiment has a plurality of stages of slats 103 from a head box 101 via a plurality of ladder cords 102. It is suspended and supported, and a bottom rail 103a is suspended and supported at the lower end of the ladder cord 102. Hereinafter, the slat 103 and the bottom rail 103a are collectively referred to as a shielding member 103. Further, in FIG. 1, the front-back direction of the drawing is the front-back direction, and the left-right direction is the width direction.

A plurality of support members 110 are arranged in the head box 101, and the tilt drum 104 is rotatably supported by the support members. The upper end of the ladder cord 102 is attached to the tilt drum 104, and a shaft 105 extending in the longitudinal direction of the head box 101 is fitted into all the tilt drums 104 at the center of the tilt drum 104. Therefore, when the shaft 105 is rotated, all the tilt drums 104 are rotated, and one of the warp threads of the ladder cord 102 is pulled up with the rotation of the tilt drum 104, so that each slat 103 and the bottom rail 103a are moved. The angle is adjusted in the same phase.

An operation rod 106 made of a tubular body is suspended and supported at one end of the head box 101, and an operation portion 106a is provided at the lower end of the operation rod 106. Then, when the operation unit 106a is gripped and the operation rod 106 is rotated, the shaft 105 is rotated via the gear mechanism arranged in the head box 101. Therefore, the angle of each shielding member 103 can be adjusted by rotating the operating rod 106.

Further, in the present embodiment, three elevating cords CDa, CDb, and CDc are suspended from the head box 101, and one end of each elevating cord CD is attached to the bottom rail 103a. Here, the one that supports the bottom rail 103a at the position farthest from the braking device 1000 is the elevating cord CDa, the one that supports the bottom rail 103a at the intermediate position is the elevating cord CDb, and the bottom rail 103a is the position closest to the braking device 1000. What is supported is an elevating cord CDc.

In addition, as shown in FIG. 11, on the support member 110 described above, guide pulleys 109a to 109c as guide members for guiding the three elevating cords CDa to CDc into the head box 101 are axes in the front-rear direction. The elevating cords CDa to CDc, which are pivotally supported by the cores 111a to 111c and introduced into the headbox 101, can be turned and guided in the width direction of the headbox (right direction in FIGS. 1 and 11). The guide pulleys 109a to 109c are configured to rotate as the elevating cords CDa to CDc move. The guide pulleys 109a to 109c are preferably formed of a material having a large frictional resistance so that the elevating cords CDa to CDc do not slip with respect to the guide pulleys 109a to 109c. For example, the guide pulleys 109a to 109c are preferably formed of an elastic body. Further, each support member 110 has a space through which another elevating cord CD can pass in the left-right direction. Here, in FIG. 11, the description of the tilt drum 104 and the shaft 105 supported by the support member 110 is omitted.

In the present embodiment, the guide pulleys 109a to 109c also have a function as individual resistance imparting means for imparting resistance to the movement of the corresponding elevating cords CDa to CDc. Specifically, dampers (oil dampers and the like) (not shown) are built in the guide pulleys 109a to 109c of the present embodiment, and rotational resistance is imparted to the rotation of the guide pulleys 109a to 109c. As a result, this point of rotation with the movement of the elevating cords CDa to CDc will be described later.

Then, the elevating cord CD is pulled out from the cord outlet 101a at the end of the headbox 101 via the lock portion 107 and the braking device 1000 installed in the headbox 101, inserted into the tubular operation rod 106, and the tip thereof. Is connected to a cord equalizer 108 provided below the operation unit 106a. Therefore, when the cord equalizer 108 is pulled downward and the elevating cord CD is pulled out from the head box 101, the bottom rail 103a is pulled up, so that each slat 103 is sequentially pulled up.

The lock portion 107 is used to prevent the shielding member 103 from dropping its own weight, and in the present embodiment, a known heart cam stopper is used. Although detailed description is omitted, when the cord equalizer 108 is pulled downward once from the locked state and released, the lock is released and the shielding member 103 is lowered, and the cord equalizer 108 is pulled again in this state. When pulled downward, the elevating cord CD is locked to prevent its own weight from dropping.

Further, the braking device 1000 brakes the movement of the elevating cord CD and reduces the momentum of the shielding member descending. Hereinafter, the braking device 1000 will be described in detail with reference to FIGS. 2 to 10.

1-2 Braking device <Structure of braking device>
In the braking device 1000 according to the present embodiment, the motion conversion unit DT that converts the movement of the elevating cord CD into rotational motion and the resistance imparting section RA that imparts rotational resistance to this rotational motion are connected in a substantially vertical direction. Become. In the present embodiment, as shown in the perspective view of FIG. 2, the slider 20, the coil spring SP, the tension transmission roller 30 including the shaft 31 and the roller portion 32, and the ring-shaped members 33 arranged above and below the roller portion 32, 34, an idle roller 40 including a shaft 41 and a roller portion 42, a carrier with internal teeth 260, a planetary gear 280, and a part of the case 10A form a motion conversion unit DT, and a weight 340, a weight holder 320 with a sun gear, and a base 70. And a part of the case 10A constitutes the resistance imparting portion RA. Further, in the present embodiment, the tension transmission roller 30 and the idle roller 40 form a pair of sandwiching members for sandwiching the elevating cord CD, and the pair of narrowing members are held by the slider 20 as a holding member. .. Hereinafter, each member will be described. In the description of the braking device 1000, the directions of the arrows shown in FIG. 3A are front-back, left-right, and up-down, respectively. That is, the direction in which the elevating cord CD extends is the front-rear direction, and more specifically, the direction in which the distance between the first top wall groove 16 and the second top wall groove 17, which will be described later, becomes narrower is the front direction. Width direction), determine the vertical direction.

As shown in FIGS. 2A and 2B, the alignment member 200 inserts a plurality of elevating cord CDs and aligns the plurality of elevating cord CDs in the same direction with each other. The aligning member 200 can be formed of, for example, a resin such as plastic.

The alignment member 200 has a configuration in which two substantially rectangular insertion portions 201 for inserting the elevating cord CD are formed in front of and behind the substantially rectangular parallelepiped frame 200a penetrating in the vertical direction. By passing the three elevating cord CDs through the insertion portion 201 and the upper part of the insertion portion 201, the elevating cord CDs are sandwiched between the pair of sandwiching members in a state of being aligned at substantially equal intervals in the vertical direction. It will be.

Next, the case 10A will be described with reference to FIGS. 2 to 4. The case 10A constitutes a housing together with the base 70, and contains a slider 20, a coil spring SP, a tension transmission roller 30 including a shaft 31 and a roller portion 32, ring-shaped members 33, 34, a shaft 41, and a roller portion 42. Holds an idle roller 40, a pinion gear 50, a carrier 260 with internal teeth, a planetary gear 280, a plate 300, a weight holder 320 with a sun gear, and a weight 340.

As shown in FIGS. 3A and 3B, the case 10A has a top wall portion 11 having a substantially square outer shape, a side wall portion 12 extending downward from the front, rear, left and right ends of the top wall portion 11, and a ceiling. Mainly, a flange portion 13 facing the wall portion 11 and extending radially from the side wall portion 12, a cylindrical portion 13C connected to the flange portion 13, and a cover portion 112 connected to the cylindrical portion 13C. It has as a structure.

Guide grooves 113 are formed on the front-rear surfaces of the side wall portions 12, respectively. These two guide grooves 113 face each other in the front-rear direction. These guide grooves 113 are grooves for inserting the elevating cord CD in the front-rear direction, and in the present embodiment, three elevating cord CDs are inserted in the vertical direction (see FIG. 3).

Further, a support groove 114 is provided on the surface in the left-right direction above the side wall portion 12. As shown in FIG. 2, the support groove 114 supports the protrusion 230 provided on the slider 20 when the case 10A holds the slider 20 inside. This makes it possible to support the slider 20, which will be described later, with its bottom floating.

As shown in FIGS. 3 (a) and 4 (a), the top wall portion 11 is formed with a first top wall groove 16 and a second top wall groove 17. The first top wall groove 16 and the second top wall groove 17 are formed obliquely with respect to the longitudinal direction of the elevating cord CD, that is, the front-rear direction, respectively, and as they go forward, which is one longitudinal direction of the elevating cord CD, The distance between the first top wall groove 16 and the second top wall groove 17 is reduced.

Specifically, the first top wall groove 16 is formed in an arc shape, and the arc of the first top wall groove 16 is concentric with the inner peripheral surface of the carrier 260 with internal teeth shown in FIG. 5 in a plan view. (See FIG. 3). On the other hand, the second top wall groove 17 is formed in a gently curved shape, has a substantially linear shape on the front side, and is curved in a direction away from the first top wall groove 16 toward the rear ( (See FIG. 3). This is because, when the second top wall groove 17 is made substantially linear, the first top wall groove 16 is an arc that approaches the elevating cord CD from the rear to the front, so that, for example, the shaft 31 and the shaft 41 are respectively. This is to prevent the vertical displacement of the elevating cord CD from being different between the shaft 31 and the shaft 41 when moving along the first top wall groove 16 and the second top wall groove 17.

By making the displacements of the shaft 31 and the shaft 41 with respect to the vertical direction close to each other in this way, the roller portion 32 and the roller portion 42 can appropriately sandwich the elevating cord CD.

As shown in FIGS. 3 (a), 3 (b) and 4 (a), the edge of the first top wall groove 16 is outside the case 10A in the first top wall groove 16 in the plan view of the case 10A. A first guide wall 16A that projects substantially vertically upward from the first top wall groove 16 is provided at least at a part of the position along the edge of the above. The purpose of the first guide wall 16A is to reduce the surface pressure of the shaft 31 moving along the first top wall groove 16, and it is possible to prevent the case 10A from being scraped by the pressure from the shaft 31. ing.

Further, at least a part of the position along the outer edge of the case 10A in the second top wall groove 17, a second guide wall 17A protruding upward from the second top wall groove 17 substantially vertically is provided. Provided. Then, the surface pressure of the shaft 41 can be reduced by the second guide wall 17A, which makes it possible to prevent the case 10A from being scraped by the pressure from the shaft 41.

As shown in FIG. 3, the flange portion 13 and the cylindrical portion 13C are formed below the side wall portion 12, and have a pinion gear 50, a carrier with internal teeth 260, a planetary gear 280, a weight holder 320 with a sun gear, and a weight 340 inside. Is placed. The cylindrical portion 13C has a substantially cylindrical shape, and a ring-shaped inner peripheral gear 115 (see FIG. 7) that meshes with the planetary gear 280 is formed on the inner surface.

The cover portion 112 is a portion connected to the cylindrical portion 13C and fitted with the base 70. In the first embodiment, the outer edge of the cover portion 112 is a substantially square shape.

As shown in FIG. 5, the slider 20 holds the tension transmission roller 30 and the idle roller 40 inside, and is configured to move together with the tension transmission roller 30 and the idle roller 40 along the support groove 114 of the case 10A. Will be done. The slider 20 has a top wall portion 21, a rear side wall portion 22, a front side wall portion 24, and a bottom wall portion 23. Further, a pair of grooves, a first top wall groove 26 and a second top wall groove 27, are formed in the top wall portion 21, and the top wall portion 21 has a first bottom wall groove at a position facing these in the vertical direction. 28 and a second bottom wall groove 29 (see FIGS. 5 and 10) are formed.

Further, the top wall portion 21 is provided with protrusions 230 at its four corners so as to project to the left and right of the top wall portion 21. The protrusion 230 is housed in the support groove 114 of the case 10A in the assembled state, and supports the slider 20 in a floating state inside the case 10A. That is, the slider 20 is held in a non-contact state with the carrier 260 with internal teeth located below.

With such a configuration, the slider 20 can be supported in a floating state inside the case 10A, and the slider 20 is prevented from coming into contact with other parts such as a carrier with internal teeth 260 to increase resistance. It can be reduced.

Through holes 25 are formed in the front side wall portion 24 and the rear side wall portion 22, respectively. The through hole 25 penetrates the front side wall portion 24 and the rear side wall portion 22 in the front-rear direction at substantially the center in the width direction of the front side wall portion 24 and the rear side wall portion 22, and has a substantially oval shape long in the vertical direction. The shape is such that the lifting cord CDs of the books can be inserted in a vertically aligned state.

Further, as shown in FIG. 5B, the rear side wall portion 22 is formed with recesses 231 formed from the outer surface of the rear side wall portion 22 on both sides of the through hole 25, and the recesses 231 are filled with recesses 231. The coil spring SP is arranged. One end of the coil spring SP projects from the recess 231. In FIG. 5B, the portion of the coil spring SP protruding from the recess 231 is omitted.

The size of the slider 20 having such a shape in the left-right direction is substantially the same as the distance between the inner walls in the width direction of the case 10A, and the size of the slider 20 in the front-rear direction is between the inner walls in the front-rear direction of the case 10A. Is made smaller than the distance of. Therefore, when the slider 20 is arranged in the space of the case 10A, the side surfaces of the top wall portion 21 and the bottom wall portion 23 of the slider 20 abut on the inner wall surface in the width direction of the case 10A, and the slider 20 is brought into the case 10A. On the other hand, movement is regulated in the width direction. In this state, since the guide groove 113 of the case 10A and the through hole 25 of the slider 20 are lined up in the front-rear direction, the elevating cord CD can be inserted into the slider 20. On the other hand, in a state where the slider 20 is arranged in the space of the case 10A, a gap is generated in the front-rear direction between the slider 20 and the inner wall surface of the case 10A, and the slider 20 moves in the front-rear direction with respect to the case 10A. be able to. Further, with the slider 20 arranged in the space of the case 10A, the coil spring SP protruding from the recess 231 of the rear side wall portion 22 of the slider 20 presses the inner wall behind the side wall portion 12 of the case 10A. Therefore, with the slider 20 arranged in the space of the case 10A, the slider 20 is located on the front side and is pressed forward in the case 10A.

Next, using FIGS. 2, 5, 6, and 8, the tension transmission roller 30, which is one of the pair of narrowing members, the idle roller 40, which is the other of the pair of narrowing members, and the pinion gear 50. explain.

The tension transmission roller 30 has a shaft 31 and a cylindrical roller portion 32 that covers the outer peripheral surface of the shaft 31. The roller portion 32 is attached to one end side of the shaft 31, and a pinion gear 50 is inserted into the other end of the shaft 31. The roller portion 32 is preferably formed of an elastic body, and is preferably made of urethane rubber (PUR), for example. Since the roller portion 32 is an elastic body, it is possible to prevent the lifting cord CD from being worn. Further, when sandwiching a plurality of elevating cord CDs, even if there is a dimensional error in the diameter of the elevating cord CDs, the difference in narrowing force for each elevating cord CD can be reduced.

The pinion gear 50 is attached to the shaft 31 by press fitting, and rotates around the shaft 31 together with the tension transmission roller 30. Further, the pinion gear 50 and the tension transmission roller 30 are separated to such an extent that the bottom wall portion 23 of the slider 20 can intervene. Although not particularly shown, a washer or the like for reducing friction may be interposed between the pinion gear 50 and the bottom wall portion 23 of the slider 20.

On the other hand, the idle roller 40 has a shaft 41 parallel to the shaft 31 of the tension transmission roller 30, and a roller portion 42 that covers the outer peripheral surface of the shaft 41. Therefore, the rotation axis of the tension transmission roller 30 and the rotation axis of the idle roller 40 are parallel to each other. The outer diameter of the roller portion 42 of the idle roller 40 is larger than the outer diameter of the roller portion 32 of the tension transmission roller 30. In the present embodiment, the outer peripheral surface of the roller portion 42 of the idle roller 40 is made of resin, and the friction coefficient is higher than that of the flat surface of metal. Further, both ends of the shaft 41 are exposed from the roller portion 42. The roller portion 42 of the idle roller 40 may also be formed of an elastic body such as urethane rubber (PUR), like the roller portion 32 of the tension transmission roller 30.

As shown in FIG. 8, the roller portion 32 of the tension transmission roller 30 and the roller portion 42 of the idle roller 40 are held inside the slider 20, and the pinion gear 50 is held outside the slider 20. That is, when the braking device 1000 is assembled, the roller portion 32 and the pinion gear 50 are configured to sandwich the bottom wall portion 23 of the slider 20.

In addition, as shown in FIGS. 2 and 8, the shaft 31 is located between the lower surface of the top wall portion 21 of the slider 20 and the upper surface of the roller portion 32, and between the upper surface of the bottom wall portion 23 and the lower surface of the roller portion 32, respectively. The ring-shaped members 33 and 34 passed through the are arranged. The ring-shaped members 33 and 34 are thin and thin to reduce friction between the roller portion 32 and the slider 20 when the tension transmission roller 30 (roller portion 32) rotates and moves relative to the slider 20. It is a member. The ring-shaped members 33 and 34 are preferably made of a material that is more slippery than the roller portion 32, and is preferably made of a material having a hardness higher than that of the roller portion 32. Similar ring-shaped members may be provided on both sides of the roller portion 42 of the idle roller 40 in the axial direction.

Next, the carrier 260 with internal teeth and the planetary gear 280 will be described with reference to FIGS. 6 and 7. In the first embodiment, the carrier 260 with internal teeth has a substantially donut shape in a plan view. The carrier 260 with internal teeth includes a flange 262 that projects outward from the cylindrical portion 264 in a plan view.

An internal gear 261 that meshes with the pinion gear 50 is formed on the inner peripheral surface of the cylindrical portion 264. Then, the flange 262 is formed with a support shaft 263 that projects downward in the vertical direction (see also FIG. 2). The support shafts 263 are preferably at equal intervals, and in the present embodiment, four support shafts 263 are provided at equal intervals.

A planetary gear 280 is rotatably supported on each of the support shafts 263. The planetary gear 280 meshes with the sun gear 323, which will be described later, and the inner peripheral gear 115 provided inside the case 10A. Then, it is possible to revolve around the central portion of the internal gear 261. Therefore, the rotation of the pinion gear 50 is transmitted to the internal gear 261 to rotate the carrier with internal teeth 260, and the carrier 260 with internal teeth is rotatably supported by the support shaft 263 provided on the flange 262 of the carrier 260 with internal teeth. The rotation of the planetary gear 280 makes it possible to accelerate the rotation caused by the pinion gear 50.

Next, the weight holder 320 with the sun gear and the weight 340 will be described with reference to FIGS. 2, 7, and 8. As shown in FIG. 2, the weight holder 320 with a sun gear is formed with convex portions 321 and concave portions 322 arranged alternately toward the outside of the ring-shaped ring portion 324. As shown in FIG. 7, a sun gear 323 meshing with the planetary gear 280 is provided on the outer outer peripheral surface of the ring portion 324 so that the rotation axis faces substantially perpendicular to the extending direction of the convex portion 321. Be done. A weight 340 is arranged in each recess 322. That is, it can be said that the weight holder 320 with the sun gear is a member that holds the weight 340 in each of the concave portions 322 with the convex portion 321 as a boundary when the braking device 1000 is assembled. The number of weights 340 is arbitrary, but it is preferably evenly spaced from the viewpoint of balance during rotation. In the first embodiment, eight weights 340 are used as an example. Therefore, eight convex portions 321 and eight concave portions 322 are also provided.

Further, as shown in FIG. 8, each weight 340 is provided with a protrusion 341 on the base 70 side. The protrusion 341 makes it possible to reduce the resistance at the time of contact with the base 70. The number of protrusions 341 is arbitrary, but in the first embodiment, four protrusions 341 are provided as an example.

During rotation caused by the pinion gear 50, the weight 340 moves in a direction away from the center of the internal gear 261 due to centrifugal force, and abuts on the inner peripheral wall of the case 10A to provide resistance as a centrifugal brake to rotation. It is to be given. Therefore, the resistance-imparting portion RA is formed by the inner peripheral wall of the case 10A, the weight holder 320 with the sun gear, and the weight 340. Then, in the present embodiment, the motion conversion unit DT and the resistance imparting unit RA are provided so as to be positioned substantially vertically.

When assembling the braking device 1000, the carrier 260 with internal teeth and the weight holder 320 with sun gears are assembled via the plate 300 shown in FIG. Specifically, the cylindrical portion 264 of the carrier 260 with internal teeth is assembled so as to be inserted into the ring portion 324 of the weight holder 320 with a sun gear. Therefore, the diameter of the cylindrical portion 264 is designed to be slightly smaller than the diameter of the ring portion 324. The plate 300 has a function of preventing the planetary gear 280 from tilting and preventing interference between the planetary gear 280 and the weight 340.

Next, the base 70 will be described with reference to FIGS. 2, 4 (b) and 5. As shown in FIG. 1, at substantially the center of the base 70, a cylindrical portion 708 that is bulkier than the surroundings and has a concave lower side is provided. Further, as shown in FIG. 3B, a first base groove 706, a first guide wall 706A, a second base groove 707, and a second guide wall 707A are provided on the upper surface of the cylindrical portion 708.

The first base groove 706 and the first guide wall 706A correspond to the first top wall groove 16 and the first guide wall 16A provided in the case 10A, respectively, and the lower ends of the shaft 31 are the first base groove 706 and the first guide wall 706A. It comes into contact with the first guide wall 706A formed on the edge thereof. Similarly, the second base groove 707 and the second guide wall 707A correspond to the second top wall groove 17 and the second guide wall 17A provided in the case 10A, respectively, and the lower ends of the shaft 41 correspond to the second base groove 707 and the second guide wall 707A, respectively. It comes into contact with the second guide wall 707A formed on the edge thereof.

By denting the lower side by providing the cylindrical portion 708 in this way, it is possible to prevent the lower ends of the shaft 31 and the shaft 41 from coming into contact with the mounting surface on which the braking device 1000 is mounted, and the shaft 31 and The lower end of the shaft 41 can be appropriately inserted (see FIG. 8).

Further, as shown in FIG. 3B, a mounting cylinder 702 used when arranging the braking device 1000 in the head box 101 is provided on the outside of the bottom surface of the base 70. Then, by fitting the mounting cylinder 702 into the upwardly projecting mounting shaft provided on the bottom surface of the head box 101, the braking device 1000 can be stably arranged in the head box.

<Assembly of braking device>
Next, the state in which the braking device 1000 is assembled will be described with reference to FIGS. 2 and 3. FIG. 3 is an assembly drawing of the braking device 1000 configured by combining the above-mentioned members. As shown in FIG. 2, such assembly is performed in a state where the central axes of the members are overlapped in the vertical direction.

Specifically, the carrier 260 with internal teeth and the weight holder 320 with a sun gear holding the weight 340 are assembled via the plate 300. At this time, the planetary gear 280 provided on the carrier 260 with internal teeth and the sun gear 323 provided on the weight holder 320 with sun gears are made to mesh with each other.

Then, the shaft 31 is slid horizontally in the first top wall groove 26 and the first bottom wall groove 28 of the slider 20, and the roller portion 32 is housed in the slider 20. At this time, ring-shaped members 33 and 34 are arranged above and below the roller portion 32 as described above. At this time, the pinion gear 50 is located outside the slider 20. Further, the shaft 41 is moved horizontally to the second top wall groove 27 and the second bottom wall groove 29, and the roller portion 42 is housed inside the slider 20. Then, the slider 20 and the carrier 260 with internal teeth are moved relative to each other so that the internal gear 261 and the pinion gear 50 provided on the carrier 260 with internal teeth mesh with each other.

After that, the base 70 is arranged under these members, and the case 10A is covered from above. Then, the first engaging groove 111A and the second engaging groove 111B provided in the case 10A and the first engaging plate portion 701A and the second engaging plate portion 701B provided in the base 70 are engaged with each other (FIG. 3). (See), the case 10A and the base 70 are fixed, and finally, the alignment member 200 is covered from above the housing composed of the case 10A and the base 70. The alignment member 200 can be fixed, for example, by engaging a claw portion provided on the alignment member 200 with an engagement hole (not shown) provided on the case 10A.

The braking device 1000 assembled in this way is shown in FIG. Then, after the assembly of the braking device 1000 is completed, three elevating cord CDs are placed in front of and behind the insertion portion 201 and the insertion portion 201 of the alignment member 200, the guide grooves 113 provided in front of and behind the case 10A, and the slider 20. It is passed through the provided through hole 25. As a result, the state shown in FIGS. 3 (a) and 3 (b) is obtained.

FIG. 3C is a left side view of the braking device 1000, that is, a side view seen from the arrow X direction of FIG. 3A. As shown in FIG. 3C, in the braking device 1000, the case 10A, the alignment member 200, and the base 70 can be visually recognized from above in the side view. Further, it can be seen that the protrusion 230 is supported by the support groove 114.

Further, as shown in FIGS. 3 (a), 3 (b) and 4 (a), the upper ends of the shaft 31 and the shaft 41 are provided in the case 10A from the first top wall groove 26 provided in the slider 20. The first top wall groove 16 is inserted and exposed to the outside of the case 10A. Similarly, the upper end of the shaft 41 is exposed to the outside of the case 10A by inserting the second top wall groove 17 provided in the case 10A through the second top wall groove 27 provided in the slider 20. Since the shafts 31 and 41 are exposed to the outside of the cover 10 in this way, these shafts can be easily moved. Therefore, even when the tension transmission roller 30 and the idle roller 40, which are a pair of narrowing members, are urged in a direction close to the elevating cord CD, the elevating cord CD can be easily inserted.

Further, as shown in FIG. 4B, the base 70 has a lower end of the shaft 31 inserted through the first base groove 706 and a lower end of the shaft 41 inserted through the second base groove 707 in the bottom view. Can be visually recognized. In addition, in the surface where the mounting cylinder 702 is provided, the shaft 31 and the lower ends of the shaft 41 may be covered from the outside by covering the top of the cylindrical portion 708 with the surface.

<Operation of braking device>
Next, the operation of the braking device 1000 according to the first embodiment will be described with reference to FIGS. 9 and 10. FIG. 9A shows a state in which the lifting cord CD is not moving and no tension is applied to the lifting cord CD (steady state), and FIG. 9B shows a state in which tension is applied to the lifting cord CD and the roller portion 32 and A state in which the elevating cord CD is sandwiched between the roller portions 42 (sandwiched state), FIG. 9 (c) summarizes the rotation directions of each member when the state changes from FIG. 9 (a) to FIG. 9 (b). It is a figure. Note that both FIGS. 9A and 9B are cross-sectional views taken along the line AA of FIG. 3C, similarly to FIG. 7. Here, for convenience of explanation, the outer circumference of the roller portion 42, which does not appear in the cross-sectional view, is displayed on the periphery of the shaft 41, and the outer circumference of the roller portion 32 is displayed on the periphery of the shaft 31.

As shown in FIG. 10A, in a steady state, as described above, the coil spring SP comes into contact with the inner wall behind the case 10A and presses the slider 20 forward. Therefore, the slider 20 is located in front of the case 10A. Therefore, the position is regulated by the shaft 31 whose position is regulated by the first top wall groove 26 and the first bottom wall groove 28 of the slider 20, and the position is regulated by the second top wall groove 27 and the second bottom wall groove 29. The shaft 41 and the shaft 41 move forward together with the slider 20. Further, the first top wall groove 16 and the second top wall groove 17 provided in the case 10A held on the upper part of the slider 20 are closer to each other toward the front. Similarly, the distance between the first base groove 706 and the second base groove 707 provided in the base 70 decreases toward the front. Therefore, the distance between the roller portion 42 rotatably supported by the shaft 41 and the roller portion 32 rotatably supported by the shaft 31 is also reduced. Further, since the first top wall groove 16 and the first base groove 706 are formed concentrically with the center point of the inner peripheral surface of the carrier 260 with internal teeth in a plan view, the shaft 31 moves in each groove. However, the pinion gear 50 can continue to mesh with the internal gear 261 provided on the carrier 260 with internal teeth.

As described above, when the distance between the roller portion 32 and the roller portion 42 becomes smaller, the roller portion 32 is pressed by the roller portion 42, and the elevating cord CD is narrowed between the roller portion 32 and the roller portion 42. At this time, the roller portion 32 and the roller portion 42 are separated from each other by the diameter of the elevating cord CD in a state where the elevating cord CD is narrowly attached to the roller portion 32 and the roller portion 42. The position at this time, that is, the position of the tension transmission roller 30 (roller portion 32) and the idle roller 40 (roller portion 42) in the steady state is set as the first narrowing position.

Then, it is assumed that in the braking device 1000 in the steady state, tension is applied to the elevating cord CD in the direction (forward) of the arrow D1. Then, the roller portion 32 rotates counterclockwise and the roller portion 42 rotates clockwise due to the frictional force generated between the elevating cord and the CD. That is, the tension transmission roller 30 provided with the roller portion 32 and the idle roller 40 provided with the roller portion 42 come into contact with the elevating cord CD extending linearly, so that the elevating cord CD can be rotated by moving in the longitudinal direction. It can be said that. Then, due to the rotation of the roller portion 32, the pinion gear 50 that shares and is fixed to the same shaft 31 also rotates (rotates) in the same direction (counterclockwise) as the roller portion 32. At this time, as shown in FIG. 10B, the shaft 31 and the shaft 41 move forward in a plan view, and the pinching guide slope 16a and the second top wall groove of the first top wall groove 16 of the case 10A By being guided by the pinching guide slope 17a of 17, the roller portion 32 and the roller portion 42 approach each other in the left-right direction, and the pinching force of the elevating cord CD by the roller portion 32 and the roller portion 42 becomes stronger. 32 will surely rotate.

Then, when the roller portion 32 and the pinion gear 50 connected to the roller portion 32 rotate, as shown in FIG. 5, the pinion gear 50 meshes with the internal gear 261. Therefore, the force given by the teeth of the pinion gear 50 is applied. As a result, the internal gear 261 rotates (rotates) counterclockwise. As a result, the carrier 260 with internal teeth also rotates (rotates) counterclockwise together with the internal gear 261. Therefore, the planetary gear 280 provided on the carrier 260 with internal teeth also rotates (revolves) counterclockwise. Here, since the planetary gear 280 meshes with the sun gear 323 and the inner peripheral gear 115 fixed by the case 10A, it revolves counterclockwise while rotating in the direction opposite to the revolution direction (clockwise). Will be done. Therefore, the sun gear 323 that meshes with the planetary gear 280 inside the planetary gear 280 rotates (rotates) in the opposite direction (counterclockwise) to the rotation of the planetary gear 280. At this time, the planetary gear 280 accelerates the rotation of the sun gear 323. As a result, the weight 340 held by the weight holder 320 with the sun gear that rotates together with the sun gear 323 also starts to rotate.

Then, as shown in FIG. 9B, when the roller portion 32 and the roller portion 42 approach the limit, the roller portion 32 continues to rotate, but the movement of the roller portion 32 along the internal gear 261 stops. At this time, the positions of the tension transmission roller 30 and the idle roller 40 in a state where the tension transmission roller 30 (roller portion 32) and the idle roller 40 (roller portion 42) are close to the limit are sandwiched between the second sandwiches within the scope of claims. The landing position. At the second pinching position, the distance between the pair of pinching members is narrower than that of the first pinching position described above, and the elevating cord CD is pinched tighter than the first pinching position. At this time, the rotation of other members due to the rotation of the roller portion 32 is continued. Then, the weight 340 comes into contact with the inner peripheral wall of the case 10A due to the centrifugal force, so that a resistance force is generated against rotation. That is, as the moving speed of the elevating cord CD increases, the rotation speed increases, which increases the centrifugal force. Then, as the centrifugal force increases, the weight 340 comes into contact with the inner peripheral wall of the case 10A more strongly, and the resistance force increases. As a result, the moving speed of the elevating cord CD can be suppressed, and the falling speed of the shielding member 103 can be suppressed.
Here, in FIG. 1, when the shielding member 103 suspended to be lifted and lowered by the lifting cord CD freely falls, the tension applied to the lifting cord CD and the resistance force of the weight 340 and the inner peripheral wall of the case 10A are balanced. , The moving speed of the elevating cord CD becomes substantially constant. Therefore, the braking device 1000 makes it possible to slowly lower the shielding member 103.

FIG. 9 (c) summarizes the rotation directions of each member (for the pinion gear 50, the front-rear direction and the tightening direction in a plan view) for the changes from the steady state to the pinched state described above. is there.

On the other hand, when tension is applied to the elevating cord CD in the direction opposite to the arrow D1 (rearward), the roller portion 32 and the roller portion 42 rotate in the opposite direction to the above. As a result, the shaft 31 and the shaft 41 are guided by the release guide slope 16b of the first top wall groove 16 and the release guide slope 17b of the second top wall groove 17, and move so as to be separated from each other. Then, the pinching force of the roller portion 32 with respect to the elevating cord CD is weakened, and the elevating cord CD can be pulled with a weak force. Therefore, when the braking device 1000 is provided in the head box 101 as shown in FIG. 1, the direction in which tension is applied to the elevating cord CD in the front in FIG. 9 is the descending direction of the shielding member 103, and the elevating cord is rearward. It is preferable that the direction in which tension is applied to the CD is the direction in which the shielding member 103 rises.

Next, the movement of the slider 20 when the state changes between the steady state and the pinched state will be described with reference to FIG. FIG. 10 (a) corresponds to FIG. 9 (a), and FIG. 10 (b) corresponds to FIG. 9 (b).

When changing from the steady state of FIG. 10 (a) to the sandwiched state of FIG. 10 (b), the shaft 41 and the roller portion 42, and the shaft 31 and the roller portion 32 are shown in the drawing due to the frictional force between the elevating cord CD. Move in front of. At this time, since the shaft 41 is in contact with the second top wall groove 27 and the second bottom wall groove 29, the second top wall groove 27 and the second bottom wall groove are accompanied by the forward movement of the shaft 41. A force is applied forward to 29. Further, since the shaft 31 is in contact with the first top wall groove 26 and the first bottom wall groove 28, the first top wall groove 26 and the first bottom wall groove 28 are moved as the shaft 31 moves forward. Force is applied forward. Therefore, when the shafts 31 and 41 move forward by Δ, the slider 20 also moves forward by Δ.

1-3 Arrangement of the braking device As shown in FIG. 1, the braking device 1000 described above is arranged so as to be sandwiched between the mounting surface in the head box 101 and the shaft 105. That is, the slider 20 and the sandwiching members 30 and 40 of the braking device 1000 move in the horizontal direction (horizontal direction in FIG. 16) in the head box 101, and the rotation axis of the planetary gear 280 is vertical in the head box 101. Arranged to face in the direction. At this time, the front-rear direction (horizontal direction in the figure) of the braking device 1000 is such that when the cord equalizer 108 is pulled and the shielding member 103 is pulled up, the lifting cord CD is released from being pinched, and the cord equalizer 108 is released to release the shielding member 103. Is oriented so that the lifting cord CD is sandwiched when the vehicle is lowered by its own weight. Further, as shown in FIGS. 1 and 11, the lock portion 107 is arranged in front of the braking device 1000 (on the left side in the drawing).

Since the braking device 1000 is mounted in such an orientation, when the cord equalizer 108 is pulled downward in a state where the shielding member 103 is fully lowered, that is, in a closed state of the shielding device 100, the tension transmission roller 30 and the idle roller 30 are used. It is separated from the 40 and the lifting cord CD can be pulled with a small resistance. On the other hand, when the shielding member 103 is not fully lowered, the elevating cord CD is released while the elevating cord CD is not locked by the lock portion 107. Then, the shielding member 103 is lowered by its own weight, and the elevating cord CD is pulled toward the front of the braking device 1000. Then, as described with reference to FIG. 10 and the like, a braking force is applied to the elevating cord CD. Therefore, the descending speed of the shielding member 103 is suppressed. Therefore, it is possible to suppress damage or the like due to the descending speed of the shielding member 103 being exceeded.

1-4 Individual resistance imparting means By the way, when the shielding device 100 includes a braking device 1000 and the braking device 1000 brakes the movement of the elevating cord CD as in the present embodiment, FIG. 12A shows. As described above, when the shielding member 103 is lowered by its own weight, the shielding member 103, particularly the bottom rail 103a, may be tilted.

The present inventors have diligently studied this problem, and found that when the braking device 1000 brakes a plurality of lifting cord CDs (in the case of the present embodiment, the three lifting cords CDa to CDc), the braking device 1000 is used. It was found that the different braking force for each elevating cord CD is the cause of the bottom rail 103a being tilted. Specifically, the pinching force for sandwiching the three lifting cords CDa to CDc by the tension transmission roller 30 and the idle roller 40, which are a pair of sandwiching members of the braking device 1000, is slightly different for each lifting cord. The braking force with respect to the elevating cords CDa to CDc is different, and the bottom rail 103a is tilted.

Therefore, in the present embodiment, guide pulleys 109a to 109c are provided separately from the braking device 1000 as individual resistance applying means for individually giving resistance to the shielding device 100 for each of the elevating cords CDa to CDc, and the elevating cords CDa to CDc are provided with the guide pulleys 109a to 109c. The total braking force is the same so that the bottom rail 103a does not tilt.

Specifically, the guide pulleys 109a to 109c of the present embodiment have a built-in damper (oil damper or the like) (not shown), and when the guide pulleys 109a to 109c rotate as the lifting cords CDa to CDc move. A rotational resistance is given to the rotation, and a braking force is given to the movement of the elevating cords CDa to CDc.

Then, for example, as shown in FIG. 12A, when the braking force on the elevating cord CDa is weaker than the braking force on the elevating cord CDc and the side far from the braking device 1000 of the bottom rail 103a is lowered (in the case of lowering to the left), As shown in FIG. 11, the braking forces Ra to Rc given to the elevating cords CDa to CDc by the guide pulleys 109a to 109c are set to Ra> Rb> Rc. As a result, the total braking force of the braking device 1000 and the guide pulleys 109a to 109c for each of the elevating cords CDa to CDc is made substantially the same, and the bottom rail 103a is kept horizontal as shown in FIG. 12B. It is possible to lower its own weight.

1-5 Action / Effect The following actions / effects can be obtained by the shielding device 100 according to the first embodiment.
(1) Since the shielding device 100 includes a braking device 1000 that collectively sandwiches a plurality of elevating cords CDa to CDc and applies a braking force to them, the moving speed of the shielding member 103 when the weight is lowered can be determined. It can be suppressed.
(2) In the braking device 1000, the tension transmission roller 30 and the idle roller 40, which are a pair of narrowing members, move from the first sandwiching position separated from each other to the second sandwiching position having a narrower spacing. Since the elevating cords CDa to CDc are sandwiched, the braking force can be applied only when the shielding member 103 is lowered by its own weight.
(3) Since the guide pulleys 109a to 109c are provided as individual resistance imparting means for individually giving resistance to each movement of the elevating cords CDa to CDc, the braking force of the elevating cords CDa to CDc by the braking device 1000 is different. Even in such a case, the braking force for each of the elevating cords CDa to CDc can be adjusted, and the inclination of the shielding member 103 can be suppressed.

The present embodiment can also be implemented in the following aspects.

In the above embodiment, the shielding device 100 includes a braking device 1000 that collectively brakes the movement of the plurality of elevating cords CDa to CDc, and has two braking devices 1000 and guide pulleys 109a to 109c as individual resistance imparting means. The structure was such that the movement of the elevating cords CDa to CDc was braked by means. However, it is also possible that the shielding device is not provided with a braking device and resistance is applied to each elevating cord only by individual resistance applying means. With such a configuration, even when the shielding member 103 is tilted due to a factor other than the braking device, the shielding member can be prevented from tilting by applying an appropriate resistance force to each elevating cord by the individual resistance applying means. It will be possible.

Further, in the above embodiment, the rotation of the tension transmission roller 30 is transmitted to the resistance applying portion RA, and the rotation resistance is imparted from the resistance applying portion RA. However, as in the configuration disclosed in Patent Document 1. The elevating cord CD may be bent by the roller moving with the movement of the elevating cord CD, and a braking force may be applied to the elevating cord CD by the bending resistance.

In the above embodiment, the guide pulleys 109a to 109c are configured so that the rotation resistance is given by the damper, and the braking force with respect to the elevating cords CDa to CDc is adjusted by making the rotation resistance of the guide pulleys 109a to 109c by the damper different. However, the dampers of the guide pulleys 109a to 109c have the same resistance, and the frictional resistance between the guide pulleys 109a to 109c and the elevating cords CDa to CDc is different by making the diameters of the guide pulleys 109a to 109c different. Therefore, the braking force for each of the elevating cords CDa to CDc may be different. Specifically, if the diameter of the guide pulley is increased, the contact area with the elevating cord CD increases and the braking force increases, and if the diameter of the guide pulley is decreased, the contact area with the elevating cord CD decreases and the braking force decreases. Will be done. Even with such a configuration, the braking force for each elevating cord CD can be adjusted.

Further, in the above embodiment, as the guide members for guiding the three elevating cords CDa to CDc into the head box 101, the guide pulleys 109a to 109c rotating around the axis 111a to 111c are used. The member may have a structure that does not rotate. In this case, the braking force can be adjusted by adjusting the frictional resistance of the contact portion with the elevating cord.

In the above embodiment, the horizontal blind has been described as an example of the shielding device 100, but the shielding device of the present invention may have a configuration different from that of the above embodiment. For example, the shielding device of the present invention may be a pleated curtain or a roll curtain on which a curtain cloth is wound.

2 Second Embodiment Next, the shielding device 100 according to the second embodiment will be described with reference to FIG. The shielding device 100 of the second embodiment differs from the first embodiment only in the shape of the case 10A of the braking device 1000 and the configuration of the individual resistance applying means. Therefore, only the differences will be described below.

As shown in FIGS. 13 (a) and 13 (b), the braking device 1000 of the shielding device 100 according to the present embodiment has a different configuration of the case 10A of the housing, but the first embodiment is generally inside the case 10A. A member similar to the braking device 1000 according to the embodiment is arranged.

Similar to the first embodiment, the top wall portion 11 of the case 10A is formed with the first top wall groove 16 and the second top wall groove 17, and the shaft 31 is formed from the first top wall groove 16. The shaft 41 is exposed to the outside of the case 10A from the top wall groove 17. A tension transmission roller 30 is rotatably supported on the shaft 31, and an idle roller 40 is rotatably supported on the shaft 41 (not shown).

Further, as shown in FIG. 13B, two support shafts 202 are provided on the rear side of the case 10A. The support shaft 202 is supported by two sets of support grooves 125 formed in a support wall 124 continuous from the side wall portion 12 of the case 10A. The support groove 125 is open upward, and the support shaft 202 can be introduced from above. Then, the elevating cord CD is supported by the support shaft 202. That is, the support shaft 202 has the same function as the alignment member 200 according to the first embodiment. That is, the case 10A does not need to be separately provided with the alignment member 200, and the support shaft 202 having the same function as the alignment member 200 can be attached to the case 10A itself.

In addition, through holes 123 are formed at two locations in the front-rear direction of the case 10A. The through hole 123 corresponds to the guide groove 113 of the first embodiment, but as shown in FIG. 13 (c), three substantially circular through holes 123a to 123c through which the elevating cords CDa to CDc are passed are formed. The circles are connected so as to share a part. The through holes 123a to 123c have different diameters, and are designed to give different resistance to the movement of the elevating cords CDa to CDc to be passed through, and in the present embodiment, the through holes 123a to 123c have different diameters. The through holes 123a to 123c correspond to the individual resistance imparting means in the claims.

Specifically, as shown in FIG. 13C, the through hole 123a through which the elevating cord CDa passes has the smallest diameter, and the through hole 123c through which the elevating cord CDc passes has the largest diameter. The braking forces Ra to Rc applied to the elevating cords CDa to CDc are Ra> Rb> Rc. As a result, for example, as shown in FIG. 12A, even when the braking force on the elevating cord CDa is weaker than the braking force on the elevating cord CDc and the side far from the braking device 1000 of the bottom rail 103a is lowered (in the case of lowering to the left). , The total braking force of the braking device 1000 and the through holes 123a to 123c for each of the elevating cords CDa to CDc is made substantially the same, and the bottom rail 103a is kept horizontal as shown in FIG. It becomes possible to make it.

The present embodiment can also be implemented in the following aspects.

In the above embodiment, the braking force applied to the elevating cords CDa to CDc is different by changing the diameter of the through hole 123, but the material of the wall surface that comes into contact with the elevating cords CDa to CDc of the through holes 123a to 123c or By making the shape different, it is also possible to make the braking force applied to each of the elevating cords CDa to CDc different.

The present invention is not limited to the above embodiment, and various modifications and changes can be made within the scope of the gist of the invention.

30: Tension transmission roller (narrowing member), 40: Idle roller (pinching member), 109a to 109c: Guide pulley (individual resistance applying means), 100: Shielding device, 103: Shielding member, 1000: Braking device, CDa ~ CDc: Lifting cord

Claims (12)

A shielding device including a plurality of elevating cords, a shielding member that elevates and lowers with the movement of the plurality of elevating cords, and a braking device that applies a braking force to the plurality of elevating cords.
Each elevating cord is provided with individual resistance imparting means that individually gives resistance to the movement of each of the plurality of elevating cords .
A shielding device in which the resistance force given to the elevating cord by the individual resistance applying means differs for each individual resistance applying means . The shielding device according to claim 1, wherein the braking device includes a pair of narrow-fitting members that collectively sandwich the plurality of elevating cords. The pair of clamping members, a first clamping position of the clamped said plurality of lift cords, spacing is narrow second clamping position of the pair of clamping members than the first clamping position Can be moved to and from
The shielding device according to claim 2, wherein the braking device is configured to apply a braking force to the elevating cord when the pair of sandwiching members are in the second sandwiching position. A head box for hanging the plurality of lifting cords and holding the braking device is provided.
The individual resistance applying means, a and the respective lift cords are arranged corresponding to the respective lifting cord Ru guide member der to guide in the head box, the shielding device according to any one of claims 1 to 3 .. The shielding device according to claim 4, wherein the guide member is a guide pulley that is rotatably supported by the head box and rotates with the movement of the elevating cord. The shielding device according to claim 5, wherein the guide pulley is configured to give a rotation resistance to the rotation of the guide pulley, and gives resistance to the movement of the elevating cord by the rotation resistance. The shielding device according to claim 6, wherein the guide pulley is configured so that rotational resistance is given by a damper, and the resistance of the damper is made different for each guide pulley corresponding to each elevating cord. The shielding device according to claim 6, wherein the guide pulley is formed so as to have a different diameter for each of the corresponding elevating cords, and the resistance force given to each elevating cord is made different due to the difference in the diameter. The braking device includes a housing and
The individual resistance applying means, Ru groove der that corresponding to each lift cord passing and the lifting cord is formed in the housing, the shielding device according to any one of claims 1 to 3. The groove is a through hole formed in the housing corresponding to each elevating cord and through which each elevating cord is passed.
The shielding device according to claim 9, wherein the resistance force given to each of the elevating cords is made different by making the diameter of each through hole different. The shielding device according to claim 10, wherein each of the through holes is substantially circular and is connected so as to share a part of the circle. A shielding device including a plurality of elevating cords and a shielding member that elevates and elevates with the movement of the plurality of elevating cords, and an individual resistance imparting means that individually gives resistance to the movement of each of the plurality of elevating cords. provided for each lift cord,
A shielding device in which the resistance force given to the elevating cord by the individual resistance applying means differs for each individual resistance applying means .