JP6313486B2 - Shielding device - Google Patents

Description

  The present invention relates to an elevating device that elevates and lowers a screen, a slat, a curtain, and the like with a pleated screen, a horizontal blind, a hoisting curtain, and the like that can raise and lower a bottom rail and an intermediate rail.

  The pleated screen suspends and supports a screen that can be bent in a zigzag shape in the vertical direction, and adjusts the amount of light appropriately by moving the screen up and down with an operating device.

  As one type of such a pleated screen, a bottom rail and an intermediate rail are provided, an intermediate rail is attached to the lower end of the upper screen supported by suspension from the head box, and the lower screen supported by suspension from the intermediate rail. Some have a bottom rail attached to the bottom. The upper screen is made of a semi-permeable cloth that partially transmits light, such as a lace cloth, and the lower screen is made of a cloth having a light shielding property.

And the operation device which raises / lowers an intermediate rail and a bottom rail is each provided, and the intermediate rail and the bottom rail can be raised / lowered independently by each operation device.
With such a configuration, when the bottom rail and the intermediate rail are lowered to the lower limit, it is possible to cover the window surface with a semi-permeable upper screen, and the bottom rail is lowered to the lower limit and the intermediate rail can be raised to the upper limit. For example, it is possible to cover the window surface with a lower screen having light shielding properties.

  If the bottom rail is lowered to the lower limit and the intermediate rail is lowered to the intermediate position, the upper part of the window surface can be covered with a semi-transparent screen and the lower part of the window surface can be covered with a light-shielding screen.

Utility model registration No. 3131044 JP 2008-163578 A JP 2009-2121 A

  In the pleated screen described in Patent Document 1, it is possible to simultaneously raise and lower the intermediate rail and the bottom rail by operating one operation cord. The bottom rail cannot be raised or lowered. Further, since the bottom rail and the intermediate rail cannot be lowered due to their own weight lowering, the lowering operation becomes complicated.

On the other hand, the lifting operation of the intermediate rail requires an operation of reversely winding the lifting / lowering cord around the winding pipe, and the operation procedure is difficult for the operator to understand.
In the pleated screen described in Patent Document 2, it is necessary to perform the lifting operation of the intermediate rail and the bottom rail and the lowering operation of the intermediate rail and the bottom rail by different operation means. Therefore, the operation becomes complicated.

  Further, the lowering operation of the intermediate rail and the bottom rail can be performed independently, but during the lifting operation, the lifting operation of only the intermediate rail and the lifting operation of only the bottom rail cannot be performed independently. Therefore, the raising / lowering operation for raising / lowering the intermediate rail and the bottom rail to a desired height becomes complicated.

  In the pleated screen described in Patent Document 3, it is necessary to perform a lifting operation of the intermediate rail and the bottom rail and a lowering operation of the intermediate rail and the bottom rail by different operation means. Moreover, in order to perform the raising operation of the bottom rail, it is necessary to raise the intermediate rail to the upper limit in advance, so that the operation for raising and lowering the bottom rail and the intermediate rail to a desired height becomes complicated.

  An object of the present invention is to provide a shielding device in which an intermediate rail and a bottom rail can be moved up and down independently with a common operation cord.

In the first aspect, the intermediate rail and the bottom rail are suspended and supported from the head box so as to be lifted and lowered, and at least the shielding material is suspended and supported between the intermediate rail and the bottom rail, and the intermediate rail is suspended and supported. The first lifting / lowering cord and the second lifting / lowering cord that suspends and supports the bottom rail are wound or unwound in the head box to raise and lower the intermediate rail and the bottom rail. In the shielding device including an elevating device that can be pulled out or folded in the vertical direction, the elevating device includes an endless operation cord hanging from the head box and a first winding for winding the first elevating cord. A winding shaft, a second winding shaft that winds up the second lifting / lowering cord, a first drive shaft that rotationally drives the first winding shaft, and a second winding shaft that rotates. A second drive shaft to be driven; a selection operation means for allowing the intermediate rail to be moved up and down by an operation to one of the operation cords; An intermediate clutch that rotates the first drive shaft and winds the first lifting / lowering cord around the first winding shaft when the bottom rail and the intermediate rail are pulled up together by pushing up the rail; The intermediate clutch includes a drive gear that rotates integrally with the second drive shaft, a driven gear that meshes with the drive gear, a gear shaft that is integral with the first drive shaft, and the gear shaft that is driven by Biasing means for biasing in the axial direction of the gear, and pushing up the intermediate rail with the bottom rail to
When the intermediate rail is pulled up collectively, the gear shaft is interlocked with the driven gear by the biasing force of the biasing means, the driven gear and the first drive shaft are interlocked, and the second drive The rotation of the shaft is transmitted to the first drive shaft.

According to a second aspect of the present invention, the intermediate clutch includes a one-way clutch that transmits only the rotation in the pulling direction of the bottom rail of the second drive shaft to the drive gear .

According to a third aspect of the present invention, the selection operation means is provided at one end portion of the head box, and the other end portion of the head box has the second lifting / lowering cord from the second winding shaft. A lower limit device is provided for setting the maximum rewind amount and setting the lower limit position of the bottom rail .

According to a fourth aspect of the present invention, the intermediate clutch is held in the case .
In claim 5, further comprising a stopper device that shifts to an operation of preventing the weight of the intermediate rail and the bottom rail from dropping when the operation cord is released after the lifting operation of the intermediate rail and the bottom rail.
The stopper device is incorporated in the intermediate clutch.
According to a sixth aspect of the present invention, the drive gear is provided at two locations with respect to the second drive shaft, and the driven gear is also provided at two locations corresponding to the drive gear.
In the seventh aspect of the present invention, the intermediate clutch is interlocked with the driven gear by the urging force of the urging means when the load of the intermediate rail is not applied to the first winding shaft. .
In the eighth aspect of the present invention, the intermediate clutch is configured such that when the load of the intermediate rail is applied to the first winding shaft, the intermediate force between the gear shaft and the driven gear against the biasing force of the biasing means. The linkage is cancelled.

  According to the present invention, it is possible to provide a shielding device in which the intermediate rail and the bottom rail can be moved up and down independently with a common operation cord.

It is a front view which shows a pleat screen. It is a side view which shows a pleat screen. It is a top view which shows a pleat screen. It is sectional drawing which shows an operating device. It is sectional drawing which shows a stopper apparatus. It is an expanded view which shows the guide groove of a drum. (A)-(c) is explanatory drawing which shows the raising / lowering operation | movement of a screen. It is a front view which shows the pleat screen of 2nd embodiment. It is a top view which shows the pleats screen of 2nd embodiment. It is sectional drawing which shows an intermediate clutch. It is sectional drawing which shows an intermediate clutch. It is a disassembled perspective view which shows an intermediate clutch. (A) (b) is sectional drawing which shows operation | movement of an intermediate clutch. It is sectional drawing which shows the intermediate clutch of 3rd embodiment. It is a side view which shows the intermediate clutch of 3rd embodiment. It is an expanded view which shows the guide groove of the stopper apparatus of 3rd embodiment. It is sectional drawing which shows the intermediate clutch of 4th embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the pleated screen shown in FIGS. 1 to 3, an upper screen 2 is suspended and supported from a head box 1, and an intermediate rail 3 is attached to the lower end of the upper screen 2. A lower screen 4 is suspended from the intermediate rail 3 and a bottom rail 5 is attached to the lower end of the lower screen 4.

  The upper screen 2 can fold a semi-permeable fabric such as a lace fabric in a zigzag shape, and the lower screen 4 can fold a light-shielding fabric in a zigzag shape.

  First and second lifting / lowering cords 6 and 7 are inserted on both sides of the upper screen 2 in the width direction, and a lower end of the first lifting / lowering cord 6 is attached to the intermediate rail 3. The second lifting / lowering cord 7 passes through the intermediate rail 3, is further inserted through the lower screen 4, and has a lower end attached to the bottom rail 5.

  The upper ends of the first and second lifting / lowering cords 6 and 7 are wound around first and second winding shafts 9 and 10 that are rotatably supported by a support member 8 in the head box 1, respectively. ing. That is, as shown in FIG. 3, the first and second winding shafts 9, 10 are arranged in the horizontal direction in the head box 1 above the first and second lifting cords 6, 7. The support member 8 is rotatably supported.

  And the upper end part of the 1st raising / lowering cord 6 is wound around the 1st winding shaft 9, The upper end part of the 2nd raising / lowering cord 7 is wound around the 2nd winding shaft 10, and the 1st and 1st The second lifting cords 6 and 7 are wound around the first and second winding shafts 9 and 10 in opposite directions. Further, the first and second elevating cords 6 and 7 are spirally wound or rewound based on the rotation of the first and second winding shafts 9 and 10.

  A hexagonal bar-shaped first drive shaft 11 is inserted into the first winding shaft 9 in a relatively non-rotatable manner. A second hexagonal bar-shaped second drive shaft 12 is relatively unrotatable in the second winding shaft 10. Is inserted. When the first drive shaft 11 is rotated in the winding direction of the first lifting / lowering cord 6, the first lifting / lowering cord 6 is wound around the first winding shaft 9, and the second driving shaft When 12 is rotated in the winding direction of the second lifting / lowering cord 7, the second lifting / lowering cord 7 is wound around the second winding shaft 10.

  An operating device 13 for rotating the first and second drive shafts 11 and 12 is attached to one end of the head box 1. As shown in FIG. 4, a pulley 15 is rotatably supported on the base end side of the case 14 of the operating device 13, and an endless ball chain 16 is hooked on the pulley 15 and suspended downward. ing. The pulley 15 can be driven to rotate by operating the ball chain 16.

  A gear 15a is integrally formed with the pulley 15, and a transmission gear 17 rotatably supported by the case 14 is meshed with the gear 15a. Therefore, when the pulley 15 is rotated, the transmission gear 17 is rotated.

  A pair of first and second clutch gears 18 and 19 that are rotatably supported by the case 14 are meshed with the transmission gear 17 on both radial sides of the transmission gear 17. When the transmission gear 17 is rotated, the first and second clutch gears 18 and 19 are rotated in the same direction.

  The first and second transmission clutches 20 and 21 having the same configuration are accommodated at the front end side of the case 14, and the input shafts 22 of the first and second transmission clutches 20 and 21 are the first and second transmission clutches. The clutch gears 18 and 19 are fitted at the center. Therefore, when the first and second clutch gears 18 and 19 are rotated, the input shafts 22 of the first and second transmission clutches 20 and 21 are rotated in the same direction.

  The first and second transmission clutches 20 and 21 have a known function of transmitting only rotation in one direction of the input shaft 22 to each output shaft 23, and the rotation directions of transmission are opposite to each other. Then, the end of the first drive shaft 11 is fitted to the output shaft 23 of the first transmission clutch 20, and the end of the second drive shaft 12 is connected to the output shaft 23 of the second transmission clutch 21. It is inserted.

  With such a configuration, when the ball chain 16 is operated in the direction of the arrow A shown in FIG. 2, for example, only the second drive shaft 12 is rotated and the second winding shaft 10 is wound around the second lifting / lowering cord 7. It is rotated in the taking direction.

When the ball chain 16 is operated in the direction of arrow B shown in FIG. 2, only the first drive shaft 11 is rotated, and the first winding shaft 9 is rotated in the winding direction of the first lifting / lowering cord 6. The
The first and second drive shafts 11 and 12 are inserted through a stopper device 24 at an intermediate portion of the head box 1. The stopper device 24 has a known function for preventing the weight drop of the intermediate rail 3 and the bottom rail 5 when the ball chain 16 is released after the intermediate rail 3 or the bottom rail 5 is lifted.

  A specific configuration of the stopper device 24 will be described. A case 25 of the stopper device 24 is fixed in the head box 1, and two cylindrical portions 26a and 26b are formed as shown in FIG. A first drum 27 and a second drum 28 are rotatably held in the cylindrical portions 26a and 26b. The first and second drums 27 and 28 can be inserted into the cylindrical portions 26a and 26b from opposite directions.

  The first drive shaft 11 is inserted into the first drum 27 so as not to be relatively rotatable, and the second drive shaft 12 is inserted into the second drum 28 so as not to be relatively rotatable. The first drum 27 rotates integrally with the first drive shaft 11, and the second drum 28 rotates integrally with the second drive shaft 12.

  A slide groove 29 having a semicircular cross section is formed along the axial direction of the first and second drive shafts 11 and 12 on the inner peripheral surfaces of the cylindrical portions 26a and 26b. A clutch ball 30 formed of a sphere is supported so as to be movable along the slide groove 29.

  A guide groove 31 having a semicircular cross section for guiding the clutch ball 30 is formed on the outer peripheral surfaces of the first and second drums 27 and 28. When the first and second drums 27 and 28 are rotated, the clutch ball 30 circulates along the guide groove 31 while moving along the slide groove 29.

  The guide grooves 31 of the first and second drums 27, 28 have the same configuration, and the first and second drums 27, 28 rotate in the left-right direction with respect to the case 25. It corresponds to the difference. With respect to the first drum 27, the configuration of the guide groove 31 will be described in a developed state shown in FIG.

  In FIG. 6, when the first drum 27 is rotated in the direction in which the intermediate rail 3 descends, the clutch ball 30 moves in the direction of the arrow C relatively along the guide groove 31. Further, when the first drum 27 rotates in the direction in which the intermediate rail 3 rises, the clutch ball 30 moves in the arrow D direction relatively along the guide groove 31.

  Downward grooves 32a and 32b are formed on both sides of the peripheral surface of the first drum 27, and an upward groove 33 is formed in the center. When the first drum 27 is rotated in the downward direction of the intermediate rail 3 with the clutch ball 30 positioned in the upward groove 33, the upward movement of the clutch ball 30 after a slight rotation. A blocking portion 34 for blocking is formed in communication. The locking portions 34 are formed at four locations at equal intervals in the circumferential direction.

  Further, when the first drum 27 is rotated in the upward direction of the intermediate rail 3 from the state where the clutch ball 30 is engaged with the locking portion 34, the clutch ball 30 is moved to any of the lower grooves 32a and 32b. It will be guided to crab.

  When the first drum 27 is rotated in the upward direction of the intermediate rail 3 from the state in which the clutch ball 30 is positioned in one of the downward grooves 32a and 32b, Four return grooves 35 for guiding 30 to the rising groove 33 are formed at equal intervals in the circumferential direction.

  The operation of the stopper device 24 including the first drum 27 will be described. The first drive shaft 11 is rotated in the winding direction of the first lifting / lowering cord 6 by the operation of the ball chain 16, and the intermediate rail 3. Is lifted, the clutch ball 30 is relatively moved in the direction of the arrow D in the rising groove 33.

  When the ball chain 16 is released after the intermediate rail 3 is pulled up to a desired height, the clutch ball 30 moves in the rising groove 33 in the direction of the arrow C due to the weight of the intermediate rail 3 and engages with the locking portion 34. Then, the movement of the clutch ball 30 in the direction of arrow C is blocked, the rotation of the first drum 27 is blocked, and the weight drop of the intermediate rail 3 is blocked.

  From this state, when the ball chain 16 is operated and the intermediate rail 3 is slightly lifted, the clutch ball 30 moves from the locking portion 34 to one of the descending grooves 32a and 32b. When the ball chain 16 is released in this state, the clutch ball 30 goes around one of the descending grooves 32a and 32b in the direction of arrow C, and the intermediate rail 3 falls by its own weight.

  Further, when the ball chain 16 is operated in the pulling direction of the intermediate rail 3 after the intermediate rail 3 is lowered to the lower limit or during the lowering operation, the clutch ball 30 is lifted from any one of the lower grooves 32a and 32b via the return groove 35. Move to the groove 33. Then, the clutch ball 30 circulates in the rising groove 33 in the direction of arrow D, and the intermediate rail 3 is pulled up.

The stopper device 24 has a function similar to the function for the lifting operation of the intermediate rail 3 with respect to the lifting operation of the bottom rail 5 by the operation of the second drum 28.
As shown in FIGS. 1 and 3, on the side of the stopper device 24, the first and second drive shafts 11 and 12 are inserted through governor devices 36 and 37, respectively. Each governor device 36, 37 suppresses the rotational speed of the first and second drive shafts 11, 12 to a predetermined value or less, and lowers the descending speed when the intermediate rail 3 and the bottom rail 5 are lowered by their own weight. To suppress.

  A lower limit for setting the maximum rewinding amount of the second lifting / lowering cord 7 from the second winding shaft 10 and setting the lower limit position of the bottom rail 5 at the other end of the head box 1. A device 38 is provided.

  As shown in FIG. 2, a pitch holding cord 39 is disposed on the back side of the upper screen 2 and the lower screen 4 at the insertion positions of the first and second lifting cords 6 and 7. The pitch holding code 39 operates so as to make the pitch of the folds of the upper screen 2 and the lower screen 4 constant.

  Next, the operation of the pleated screen configured as described above will be described. When the ball chain 16 is pulled down in the direction of arrow A, only the second drive shaft 12 is rotated, the second lifting / lowering cord 7 is wound around the second winding shaft 10, and the bottom rail 5 is pulled up. When the ball chain 16 is released after the bottom rail 5 is pulled up to a desired height, the bottom rail 5 is held at the desired height by the self-weight drop prevention operation of the stopper device 24.

From this state, when the ball chain 16 is pulled in the direction of arrow A and then released, the operation of preventing the weight of the stopper device 24 from falling is released, and the bottom rail 5 is lowered by its own weight.
When the ball chain 16 is pulled down in the direction of arrow B, only the first drive shaft 11 is rotated, the first lifting / lowering cord 6 is wound around the first winding shaft 9, and the intermediate rail 3 is pulled up. When the ball chain 16 is released after the intermediate rail 3 is pulled up to the desired height, the intermediate rail 3 is held at the desired height by the self-weight drop prevention operation of the stopper device 24.

From this state, when the ball chain 16 is pulled in the direction of the arrow B and then released, the operation for preventing the weight reduction of the stopper device 24 is released, and the intermediate rail 3 is lowered by its own weight.
As shown in FIG. 7 (a), when the intermediate rail 3 is held in the middle of the lifting range and the bottom rail 5 is pulled up from the state where the bottom rail 5 is located near the lower limit, When the bottom rail 5 is pulled up to the middle, the bottom rail 5 is in a state of pushing up the middle rail 3.

  Next, when the bottom rail 5 is further lifted, the intermediate rail 3 is pushed up together with the bottom rail 5, and the ball chain 16 is released with the bottom rail 5 and the intermediate rail 3 pulled up to the upper limit as shown in FIG. Then, the bottom rail 5 and the intermediate rail 3 are held directly under the head box 1.

  From this state, when the ball chain 16 is pulled in the direction of arrow A and released, the action of preventing the self-weight drop of the bottom rail 5 of the stopper device 24 is released, so that the bottom rail 5 falls by its own weight.

  At this time, the intermediate rail 3 is lowered by its own weight together with the bottom rail 5 and, after being lowered to the height shown in FIG. It is held at that height.

In the pleated screen configured as described above, the following operational effects can be obtained.
(1) By operating the common ball chain 16, the intermediate rail 3 and the bottom rail 5 can be moved up and down independently.
(2) The intermediate rail 3 and the bottom rail 5 can be easily lowered by an independent weight lowering operation.
(3) When the bottom rail 5 is lifted, the bottom rail 5 can be pulled up while pushing up the intermediate rail 3. Therefore, by pulling up the bottom rail 5, the intermediate rail 3 can be pulled up collectively.
(4) The bottom rail 5 and the intermediate rail 3 pulled together can be held at desired positions by the operation of the stopper device 24.
(5) When the bottom rail 5 and the intermediate rail 3 are pulled together and then the bottom rail 5 is lowered by its own weight, the bottom rail 5 and the intermediate rail 3 can be lowered collectively. Then, the operation of the stopper device 24 can automatically stop the lowering operation of the intermediate rail 3 at the position where the bottom rail 5 starts to push up.
(Second embodiment)
8 to 13 show a second embodiment. In this embodiment, when the intermediate rail 3 is pushed up by the bottom rail 5, the first lifting / lowering cord 6 that winds and supports the intermediate rail 3 by the first winding shaft 9 is wound up. An intermediate clutch 41 is provided to prevent loosening in the head box 1 or between the folds of the upper screen 2. The configuration other than the intermediate clutch 41 is the same as that of the first embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  As shown in FIGS. 8 and 9, an intermediate clutch 41 is disposed on one side of one support member 8. As shown in FIGS. 10 and 12, the intermediate clutch 41 has a driving drum 43 rotatably supported at the rear portion of the case 42, and the second clutch hole is formed in a hexagonal hole formed at the center of the driving drum 43. The drive shaft 12 is inserted so as not to be relatively rotatable. Accordingly, the drive drum 43 rotates integrally with the second drive shaft 12.

  An inner cylinder portion 44 and an outer cylinder portion 45 are formed at the distal end portion of the drive drum 43, and the base end portion of the transmission shaft 46 is rotatably fitted to the outer peripheral surface of the inner cylinder portion 44. A coil-like slip spring 47 is fitted on the outer peripheral surface of the base end portion of the transmission shaft 46, and one end of the slip spring 47 is engaged with a locking groove 48 of the drive drum 43. The drive drum 43 and the transmission shaft 46 are always rotated integrally by friction between the slip spring 47 and the transmission shaft 46.

  A drive gear 49 is rotatably supported by the case 42 at the distal end side of the transmission shaft 46, and a one-way clutch 50 is interposed between the drive gear 49 and the transmission shaft 46.

  When the second drive shaft 12 and the transmission shaft 46 are rotated in the pulling direction of the bottom rail 5, the one-way clutch 50 is locked and transmits the rotational torque in the same direction to the drive gear 49. Further, when the second drive shaft 12 and the transmission shaft 46 are rotated in the lowering direction of the bottom rail 5, the second drive shaft 12 and the transmission shaft 46 are in a free state and do not transmit rotational torque to the drive gear 49.

  The slip spring 47 idles the drive drum 43 with respect to the transmission shaft 46 when a torque is applied to rotate the second drive shaft 12 in the pulling direction of the bottom rail 5 while the rotation of the drive gear 49 is blocked. Thus, the operation of the one-way clutch 50 is prevented.

A driven gear 51 that meshes with the drive gear 49 is rotatably supported at a front portion in the case 42, and a gear shaft 52 is inserted into the central portion of the driven gear 51 so as to be relatively rotatable. Further, a switching spring 53 constituted by a coil spring is disposed between the gear shaft 52 and the case 42, and the gear shaft 52 is moved by the biasing force of the switching spring 53 as a biasing means with the case 42 as a fulcrum. It is always urged in the direction of arrow E shown in FIG.

  A T-shaped engagement protrusion 54 is formed on the outer peripheral surface of the gear shaft 52, and the engagement protrusion when the gear shaft 52 moves in the direction of arrow E while rotating on the inner peripheral surface of the driven gear 51. An engaging recess 55 is formed to engage with 54. When the engagement protrusion 54 engages with the engagement recess 55, the gear shaft 52 rotates integrally with the driven gear 51.

  The base end portion of the cam shaft 56 is fitted to the distal end of the gear shaft 52 so that the cam shaft 56 rotates integrally with the gear shaft 52. On the outer peripheral surface of the cam shaft 56, a protrusion 57 is formed that protrudes in a line symmetrical manner in the radial direction.

  The distal end portion of the cam shaft 56 is fitted to the proximal end portion of the cam cylinder 58. A guide hole 59 for guiding the protrusion 57 of the cam shaft 56 is formed in the cam cylinder 58 in an oblique direction, and the cam shaft 56 moves in the axial direction of the first drive shaft 11 while rotating with respect to the cam cylinder 58. It is possible.

  The tip of the cam cylinder 58 is fitted on the first winding shaft 9 so that the cam cylinder 58 and the first winding shaft 9 rotate together. A hexagonal hole 60 is formed at the center of the camshaft 56, and the first drive shaft 11 is inserted into the hexagonal hole 60 so as not to be relatively rotatable. The first drive shaft 11 is inserted into the gear shaft 52 and the central portion of the cam cylinder 58 so as to be relatively rotatable.

  A brake spring 61 is disposed around the base end side of the driven gear 51 and is fitted to the inner peripheral surface of a metal sliding cylinder 62 fixed to the case 42 so as not to rotate. The brake spring 61 is constituted by a torsion coil spring, one end of which is hooked on the driven gear 51, and when the driven gear 51 is rotated in the downward direction of the intermediate rail 3, the diameter thereof is increased and the sliding is performed. Friction with the cylinder 62 is increased to prevent the driven gear 51 from rotating in the same direction (brake device).

  Further, when the driven gear 51 is rotated in the pulling direction of the intermediate rail 3, the brake spring 61 reduces the friction with the sliding cylinder 62 and allows the driven gear 51 to rotate in the same direction. Yes.

  In the intermediate clutch 41 configured as described above, when the load of the intermediate rail 3 is applied to the first winding shaft 9, the operation of the cam shaft 56 and the cam cylinder 58 is performed as shown in FIG. As a result, the cam shaft 56 is moved in the direction of the arrow F. In this state, as shown in FIG. 13A, the engagement between the engagement protrusion 54 of the gear shaft 52 and the engagement recess 55 of the driven gear 51 is released, and the driven gear 51 and the gear shaft 52 are independent. Rotate.

  In this state, when the second drive shaft 12 is rotated in the lifting direction of the bottom rail 5, the drive gear 49 and the driven gear 51 are rotated, but the rotation of the driven gear 51 is not transmitted to the gear shaft 52.

When the first drive shaft 11 is rotated, the gear shaft 52 is rotated via the cam shaft 56, but the rotation is not transmitted to the driven gear 51.
On the other hand, when the load of the intermediate rail 3 does not act on the first winding shaft 9 while the second drive shaft 12 is rotated in the pulling direction of the bottom rail 5, the biasing force of the switching spring 53, The gear shaft 52 moves in the direction of arrow E shown in FIG. 10 by the action of the cam shaft 56 and the cam cylinder 58 (cam mechanism).

  Then, as shown in FIG. 13B, the engagement protrusion 54 of the gear shaft 52 engages with the engagement recess 55 of the driven gear 51, and the driven gear 51 and the gear shaft 52 rotate integrally. Thus, the first drive shaft 11 and the first winding shaft 9 are rotated in the pulling direction of the intermediate rail 3 based on the rotation of the drive gear 49 (transmission device). As a result, the intermediate rail 3 and the bottom rail 5 are pulled up simultaneously.

Next, the operation of the pleated screen provided with the intermediate clutch 41 as described above will be described.
When the intermediate rail 3 is lifted and lowered independently and the bottom rail 5 is lifted and lowered independently, the operation is the same as that of the first embodiment, and the intermediate clutch 41 includes the first and second drive shafts 11, No effect on 12 rotations.

  When the intermediate rail 3 is pushed up by the bottom rail 5 and the bottom rail 5 and the intermediate rail 3 are pulled together, the load of the intermediate rail 3 does not act on the first winding shaft 9. Then, the gear shaft 52 moves in the direction of arrow E shown in FIG. 10 and engages with the driven gear 51, and rotates together with the driven gear 51.

  As a result, the first winding shaft 9 is rotated in the winding direction of the first lifting / lowering cord 6, and the first lifting / lowering cord 6 is wound around the first winding shaft 9. When the bottom rail 5 is pulled up to a desired height and the ball chain 16 is released, the bottom rail 5 is prevented from falling by the operation of the stopper device 24, and the intermediate rail 3 is held on the bottom rail 5.

  When the bottom rail 5 is lowered from the state where the bottom rail 5 and the intermediate rail 3 are collectively lifted, the ball chain 16 is slightly pulled in the direction of arrow A shown in FIG. The prevention operation is released, and the bottom rail 5 falls by its own weight.

At this time, the rotation of the second drive shaft 12 is not transmitted to the drive gear 49 due to the operation of the one-way clutch 50.
When the bottom rail 5 is lowered by its own weight, it is desirable to hold the intermediate rail 3 in the lifted position. However, the stopper device 24 is not effective in preventing its own weight drop, and the clutch ball 30 is placed in one of the lower grooves 32a and 32b. It may exist.

  However, since the rotation of the driven gear 51 in the lowering direction of the intermediate rail 3 is always blocked by the brake spring 61, the intermediate rail 3 will not drop by its own weight (self-weight drop limiting device). When the ball chain 16 is operated in the direction of arrow B shown in FIG. 2 to rotate the first drive shaft 11, the engagement between the gear shaft 52 and the driven gear 51 is released, and the intermediate rail 3 is independently It returns to the state where it can move up and down.

  When the bottom rail 5 and the intermediate rail 3 are collectively lifted, then the bottom rail 5 is lowered by its own weight, and then the bottom rail 5 is lifted, the gear shaft 52 and the driven gear 51 are still in an engaged state, The rail 3 may also be raised.

  When the intermediate rail 3 is pulled up to the upper limit, the first drive shaft 11 can no longer be rotated in the same direction, and the rotation of the drive gear 49 is prevented. In this state, if the second drive shaft 12 is further rotated in the same direction to pull up the bottom rail 5, the slip spring 47 slips and the drive drum 43 rotates idly with respect to the transmission shaft 46 (transmission torque limiting device). ). As a result, damage to the one-way clutch 50 due to excessive torque is prevented.

In the pleated screen including the intermediate clutch 41 as described above, the following operational effects can be obtained in addition to the operational effects obtained in the first embodiment.
(1) When the bottom rail 5 is pulled up and the bottom rail 5 and the intermediate rail 3 are pulled together, the first lifting / lowering cord 6 can be wound up by the first winding shaft 9. Accordingly, it is possible to prevent the first lifting / lowering cord 6 from slacking in and out of the head box 1, so that the first lifting / lowering cord 6 is caught in the head box 1, protrudes from the folded upper screen 2, etc. Can be prevented in advance.
(2) When the bottom rail 5 is lowered by its own weight after the bottom rail 5 and the intermediate rail 3 are pulled together, the simultaneous lowering of the weight of the intermediate rail 3 can be prevented.
(3) When the bottom rail 5 and the intermediate rail 3 are pulled together, then the bottom rail 5 is lowered by its own weight, and then the bottom rail 5 is pulled up, the bottom rail is prevented from being lifted. The one-way clutch 50 can be prevented from being damaged even if it is forcibly pulled up.
(Third embodiment)
14 to 15 show a third embodiment. This embodiment includes an intermediate clutch 71 different from the intermediate clutch 41 of the second embodiment, and is a partial modification of the configuration of the stopper device 24. Other configurations are the same as those of the first and second embodiments. It is the same. The same components as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  In an intermediate clutch 71 shown in FIG. 14, a drive gear 73 is rotatably supported by a case 72, and a one-way clutch 74 is accommodated on one side of the drive gear 73. A one-way clutch shaft 75 is inserted through the central portion of the one-way clutch 74, and a hexagonal hole 76 is formed in the central portion of the one-way clutch shaft 75. The second drive shaft 12 is inserted through the hexagonal hole 76.

  The one-way clutch 74 does not transmit the rotation of the second drive shaft 12 in the arrow F direction shown in FIG. 15, that is, the bottom rail lowering direction, to the drive gear 73, and in the arrow G direction shown in FIG. The rotation of the shaft 12 in the direction of raising the bottom rail is transmitted to the drive gear 73.

  On the side of the drive gear 73, a first spring clutch shaft 77 is rotatably supported by the case 72, and a driven gear 78 that meshes with the drive gear 73 on the first spring clutch shaft 77 is rotatable. It is supported.

  A shaft portion 79 on the base end side of the driven gear 78 and a base end portion 80 of the first spring clutch shaft 77 are formed with substantially the same diameter, and the outer peripheral surface of the shaft portion 79 and the base end portion 80 is formed on the outer peripheral surface. A clutch spring 81 is fitted. The first spring clutch shaft 77 is made of metal, and the outer diameter of the base end portion 80 is slightly smaller than the outer diameter of the shaft portion 79 of the driven gear 78 made of synthetic resin. And the base end portion 80 of the first spring clutch shaft 77 are set to be smaller than the friction between the clutch spring 81 and the shaft portion 79 of the driven gear 78.

  In a state where the load of the intermediate rail 3 is applied to the first spring clutch shaft 77, the clutch spring 81 idles with respect to the first spring clutch shaft 77 even when the driven gear 78 is rotated, and the driven gear is driven. The rotation of 78 is not transmitted to the first spring clutch shaft 77.

  On the other hand, in a state where the load of the intermediate rail 3 is not applied to the first spring clutch shaft 77, the driven gear 78 rotates due to friction between the base end portion 80 of the first spring clutch shaft 77 and the clutch spring 81. It is transmitted to the first spring clutch shaft 77 via the clutch spring 81.

  On the proximal end side of the first spring clutch shaft 77, a one-way clutch 84 is disposed between a support cylinder 82 provided on the case 72 and a housing 83 positioned around the support cylinder 82. The one-way clutch 84 operates with the support cylinder 82 as a fulcrum, and allows the housing 83 to rotate in the direction indicated by the arrow H shown in FIG. 15, that is, in the pulling direction of the intermediate rail 3. Prevent the rotation of.

  A second spring clutch shaft 86 is rotatably supported between the housing 83 and an engagement piece 85 extending to the proximal end portion of the first spring clutch shaft 77, and the center of the second spring clutch shaft 86. A hexagonal hole 87 is formed in the part. And the said 1st drive shaft 11 is penetrated by the hexagon hole 87 so that relative rotation is impossible. The first drive shaft 11 is inserted into the first spring clutch shaft 77 and the support cylinder 82 so as to be relatively rotatable.

  A clutch spring 88 is fitted on the outer peripheral surface of the second spring clutch shaft 86, and both ends of the clutch spring 88 can be engaged with the engaging piece 85 of the first spring clutch shaft 77 and the housing. ing. In addition, a predetermined idling angle is secured until the first spring clutch shaft 77 rotates and the engagement piece 85 contacts the end of the clutch spring 88 (idling means).

  The friction between the clutch spring 88 and the second spring clutch shaft 86 is set to be smaller than the friction between the clutch spring 81 and the first spring clutch shaft 77.

  In this embodiment, the configuration of the guide groove of the second drum through which the second drive shaft 12 is inserted among the drums accommodated in the stopper device 24 is different from those of the first and second embodiments.

  FIG. 16 shows the guide groove 89 of the second drum 28. The guide groove 89 allows the second drive shaft 12 to be moved to the bottom rail in order to release the weight lowering operation from the state where the clutch ball 30 is locked by the locking portion 34 to prevent the bottom rail 5 from dropping its own weight. A locking portion (restricting means) 34a for restricting the rotation angle of the second drive shaft 12 is formed when the second drive shaft 12 is rotated in the pulling direction 5 (arrow D direction in FIG. 16). Other configurations are the same as those of the guide groove 31 of the embodiment.

  Then, from the state where the clutch ball 30 is positioned at the locking portion 34 and the bottom rail 5 is prevented from falling under its own weight, the ball chain 16 is operated to move the second drive shaft 12 in the lifting direction of the bottom rail 5. The clutch ball 30 is rotated to move to the locking portion 34a, and the ball chain 16 is released in this state.

Then, the clutch ball 30 moves in one of the descending grooves 32a and 32b, and the bottom rail 5 falls by its own weight.
The rotation angle of the second drive shaft 12 required for moving the clutch ball 30 from the locking portion 34 to the locking portion 34a by the second drum 28 is set as follows. That is, the idling angle until the first spring clutch shaft 77 comes into contact with the end of the clutch spring 88, and the first drum 27 causes the clutch ball 30 to move from the locking portion 34 to any of the descending grooves 32a and 32b. It is set so as to be smaller than the sum of the angles required for guiding the crab.

Next, the operation of the pleated screen provided with the intermediate clutch 71 configured as described above will be described.
When the intermediate rail 3 and the bottom rail 5 are moved up and down independently, the first spring clutch shaft 77 is connected to the intermediate rail 3 via the first drive shaft 11, the second spring clutch shaft 86 and the clutch spring 88. A load is acting.

  In this state, when the ball chain 16 is operated to rotate the first drive shaft 11 in the pulling direction of the intermediate rail 3, the rotation of the first drive shaft 11 in the intermediate clutch 71 causes the second spring clutch shaft 86 to rotate. Is transmitted to the driven gear 78 via the clutch spring 88, the first spring clutch shaft 77 and the clutch spring 81, and the drive gear 73 is rotated. However, the one-way clutch 74 is idled and the rotation of the drive gear 73 is not transmitted to the second drive shaft 12. As a result, when the intermediate rail 3 is pulled up and the ball chain 16 is released, the intermediate rail 3 is held at a desired height by the operation of the stopper device 24.

  From this state, when the operation of the stopper device 24 with respect to the first drive shaft 11 is released by operating the ball chain 16, the load of the intermediate rail 3 acts on the first drive shaft 11. Since the one-way clutch 84 prevents the rotation of the housing 83 in the lower direction of the intermediate rail 3, a slip is generated between the second spring clutch shaft 86 and the clutch spring 88 due to the load of the intermediate rail 3, and the first The drive shaft 11 and the second spring clutch shaft 86 rotate. As a result, the intermediate rail 3 falls by its own weight.

  When the ball chain 16 is operated to rotate the second drive shaft 12 in the pulling direction of the bottom rail 5, the drive gear 73 is rotated through the one-way clutch 74 and the driven gear 78 is rotated in the intermediate clutch 71.

  Since the load of the intermediate rail 3 is acting on the first spring clutch shaft 77, the rotation of the driven gear 78 is not transmitted to the first spring clutch shaft 77. Therefore, the intermediate rail 3 cannot be pulled up.

  When the operation of the stopper device 24 releases the weight lowering prevention operation for the second drive shaft 12 of the stopper device 24 by operating the ball chain 16 from the state where the bottom rail 5 is held at a desired height, the bottom rail 5 The second drive shaft 12 is rotated by the load, and the bottom rail 5 falls by its own weight.

At this time, in the intermediate clutch 71, the second drive shaft 12 can be freely rotated by the one-way clutch 74, and the drive gear 73 is not rotated.
When the intermediate rail 3 is prevented from falling by the stopper device 24, when the intermediate rail 3 is pushed up by the bottom rail 5 and the bottom rail 5 and the intermediate rail 3 are collectively lifted, the second drive shaft 12 The rotation is transmitted to the driven gear 78 via the drive gear 73.

  Based on the rotation of the driven gear 78, the clutch spring 81 is rotated integrally with the driven gear 78. Since the load of the intermediate rail 3 does not act on the first spring clutch shaft 77, the driven gear 78 and the first spring clutch shaft 77 are rotated together via the clutch spring 81, and the second spring The clutch shaft 86 is rotated integrally with the first spring clutch shaft 77.

As a result, the first drive shaft 11 is rotated in the pulling direction of the intermediate rail 3, and the first lifting / lowering cord 6 is wound around the first winding shaft 9.
When the ball chain 16 is released after the bottom rail 5 and the intermediate rail 3 are collectively lifted to a desired height, the stopper device 24 prevents the bottom rail 5 from falling under its own weight, so that the bottom rail 5 and the intermediate rail 3 have the desired height. Retained.

  From this state, the ball chain 16 is operated, and the second drive shaft 12 is operated in the direction in which the bottom rail 5 is pulled up. As shown in FIG. When the ball chain 16 is released by moving from 34 to the locking portion 34a, the bottom rail 5 falls by its own weight.

  At this time, in the first drum 27, the clutch ball 30 does not reach any of the descending grooves 32a and 32b, and the clutch ball 30 returns to the locking portion 34 by releasing the ball chain 16, so Simultaneous weight drop of the rail 3 is prevented.

In the pleated screen including the intermediate clutch 71 and the stopper device 24 as described above, the following operational effects can be obtained in addition to the operational effects obtained in the first embodiment.
(1) When the bottom rail 5 is pulled up and the bottom rail 5 and the intermediate rail 3 are pulled together, the first lifting / lowering cord 6 can be wound up by the first winding shaft 9. Accordingly, it is possible to prevent the first lifting / lowering cord 6 from slacking in and out of the head box 1, so that the first lifting / lowering cord 6 is caught in the head box 1, protrudes from the folded upper screen 2, etc. Can be prevented in advance.
(2) When the bottom rail 5 is lowered by its own weight after the bottom rail 5 and the intermediate rail 3 are pulled together, the simultaneous lowering of the weight of the intermediate rail 3 can be prevented.
(3) When the bottom rail 5 and the intermediate rail 3 are pulled up at the same time, even if the bottom rail 5 is forcibly lifted in a state where the lifting of the intermediate rail 3 is prevented, the driven gear 78 with respect to the first spring clutch shaft 77. Is idle, so that the intermediate clutch 71 can be prevented from being damaged.
(Fourth embodiment)
FIG. 17 shows a fourth embodiment. This embodiment includes an intermediate clutch 91 different from the intermediate clutch 41 of the second embodiment, and is a partial modification of the configuration of the stopper device 24. Other configurations are the same as those of the first and second embodiments. It is the same. The same components as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the intermediate clutch 91 shown in FIG. 17, clutch drums 93a and 93b are rotatably supported on both sides of a case 92, and drive gears 94a and 94b are rotatably supported at the tip ends of the clutch drums 93a and 93b.

  Clutch springs 95a and 95b composed of torsion coil springs are fitted on the outer peripheral surfaces of the clutch drums 93a and 93b, and one ends of the clutch springs 95a and 95b engage with the drive gears 94a and 94b. ing.

  The second drive shaft 12 is fitted into the clutch drums 93a and 93b so as not to be relatively rotatable. Accordingly, the clutch drums 93a, 93b are rotated integrally with the second drive shaft 12.

  The clutch springs 95a and 95b transmit the rotation to the drive gears 94a and 94b when the second drive shaft 12 is rotated in the pulling direction of the bottom rail 5, and the second drive shaft 12 is When the rail 5 is rotated in the descending direction, it rotates idly with respect to the clutch drums 93a and 93b.

  The driven gear 96a meshing with the drive gear 94a is rotatably supported by one end portion of a stopper case 97 constituting the stopper device 104 of the intermediate rail 3, and one end of the stopper case 97 is connected to the driven gear 96a. An engaging clutch spring 98 is fitted. The stopper case 97 is supported so as to be rotatable within a range of 90 degrees with respect to the case 92 of the intermediate clutch 91.

  The stopper case 97 accommodates a drum 99 in which a guide groove 31 similar to the first drum 27 of the stopper device 24 of the first embodiment is formed, and the drum 99 and the inner peripheral surface of the stopper case 97. A clutch ball 30 that moves along the guide groove 31 is disposed between them. The first drive shaft 11 is inserted into the drum 99, and the drum 99 rotates integrally with the first drive shaft 11.

  A cam shaft 101 is rotatably supported in a cylindrical portion 100 formed at the other end portion of the stopper case 97, and the hexagonal hole formed in the central portion of the cam shaft 101 has the first drive shaft. 11 is inserted and the cam shaft 101 rotates integrally with the first drive shaft 11.

  In the cylindrical portion 100, a guide hole 102 in an oblique direction is formed in the same manner as the guide hole 59 formed in the cam cylinder 58 of the second embodiment. A protrusion 103 protruding into the guide hole 102 is formed at the base end portion of the cam shaft 101. When the stopper case 97 is rotated, the projection 103 is guided along the guide hole 102 so that the cam shaft 101 moves in the arrow K direction while rotating.

  A driven gear 96b that meshes with the drive gear 94b is rotatably supported by the case 92. When the cam shaft 101 moves in the arrow K direction, the locking piece 105 of the cam shaft 101 is engaged with the driven gear 96b, so that the driven gear 96b and the cam shaft 101 are rotated together. Yes.

  The second drive shaft 12 is inserted outside the intermediate clutch 91 into a drum having a self-weight drop prevention function similar to the second drum 28 of the stopper device 24 of the first embodiment. Further, since the first drive shaft 11 is a drum 99 and has a self-weight drop prevention function, a separate stopper device is not required.

  Next, the operation of the intermediate clutch 91 configured as described above will be described. When the bottom chain 5 is lifted by operating the ball chain 16, when the second drive shaft 12 is rotated in the bottom rail 5 pulling direction, the drive gears 94a, 94b are moved via the clutch drums 93a, 93b. It is rotated.

  The driven gear 96a is rotated based on the rotation of the drive gear 94a. Since the load of the intermediate rail 3 acts on the stopper case 97 from the first drive shaft 11 via the drum 99 and the clutch ball 30, the clutch The spring 98 is idle with respect to the stopper case 97, and the stopper case 97 is not rotated.

  The rotation of the drive gear 94b is transmitted to the driven gear 96b, but the driven gear 96b is not engaged with the cam shaft 101. Accordingly, the intermediate clutch 91 does not function at all when the bottom rail 5 is lifted.

  When the bottom rail 5 is lowered, the operation of the ball chain 16 releases the self-weight drop prevention operation of the stopper device, and the second drive shaft 12 is rotated in the downward direction of the bottom rail 5. At this time, the rotation of the second drive shaft 12 is not transmitted to the drive gears 94a and 94b, and the intermediate clutch 91 does not function at all.

  During the lifting operation of the intermediate rail 3, the first drive shaft 11 is rotated in the lifting direction of the intermediate rail 3. Then, the drum 99 is rotated and the clutch ball 30 moves along the guide groove 31 of the drum 99. When the ball chain 16 is released, the intermediate rail 3 is held at a desired height by the stopper device 104.

  When the first drive shaft 11 is rotated by the operation of the ball chain 16 to release the self-weight drop prevention operation of the stopper device 104, the first drive shaft 11 is rotated in the lowering direction of the intermediate rail 3, and the intermediate rail 3 falls by its own weight.

  When the intermediate rail 3 is pushed up by the bottom rail 5 and the bottom rail 5 and the intermediate rail 3 are collectively lifted, the load of the intermediate rail 3 does not act on the stopper case 97. When the second drive shaft 12 is rotated in the pulling direction of the bottom rail 5 in this state, the drive gears 94a and 94b are rotated, and the driven gears 96a and 96b engaged with the drive gear 94b are rotated.

  When the driven gear 96a is rotated, the stopper case 97 is rotated 90 degrees via the clutch spring 98. Then, the cam shaft 101 moves in the direction of the arrow K and enters a state of rotating integrally with the driven gear 96b. As a result, the rotation of the second drive shaft 12 is transmitted to the first drive shaft 11, and the first lifting / lowering cord 6 is wound around the first winding shaft 9 as the intermediate rail 3 rises.

In the pleated screen including the intermediate clutch 91 and the stopper device 104 as described above, the following operational effects can be obtained.
(1) When the bottom rail 5 is pulled up and the bottom rail 5 and the intermediate rail 3 are pulled together, the first lifting / lowering cord 6 can be wound up by the first winding shaft 9. Accordingly, it is possible to prevent the first lifting / lowering cord 6 from slacking in and out of the head box 1, so that the first lifting / lowering cord 6 is caught in the head box 1, protrudes from the folded upper screen 2, etc. Can be prevented in advance.

You may implement the said embodiment in the following aspects.
・ In addition to the lifting device that lifts and lowers the screen, slats, curtains, etc. with pleated screens, horizontal blinds, curtains, etc. You may utilize for lifting devices, such as an insect screen.

  DESCRIPTION OF SYMBOLS 1 ... Head box, 2 ... Shielding material (upper screen), 3 ... Intermediate rail, 4 ... Shielding material (lower screen), 5 ... Bottom rail, 6 ... 1st raising / lowering cord, 7 ... 2nd raising / lowering cord, 13 ... operating device, 16 ... operating code (ball chain).

Claims (8)

An intermediate rail and the bottom rail and liftably suspended supporting from the head box, the shielding material is suspended supporting at least between the intermediate rail the bottom rail, the first lift of suspended supporting the intermediate rail code and draws the shielding material by lifting the winding the second lift cord supporting hanging the bottom rail in the head box, or a rewind the intermediate rail the bottom rail in the vertical direction or In the shielding device equipped with a lifting device that can be folded,
The lifting device is
An endless operation cord hanging from the head box;
A first winding shaft for winding the first lifting cord;
A second winding shaft for winding the second lifting cord;
A first drive shaft for rotationally driving the first winding shaft;
A second drive shaft that rotationally drives the second winding shaft;
A selection operation means that allows the intermediate rail to be raised and lowered by an operation to one of the operation codes, and allows the bottom rail to be raised and lowered by an operation to the other;
When the intermediate rail is pushed up by the bottom rail and the bottom rail and the intermediate rail are pulled up together, the first lifting / lowering cord rotates the first drive shaft to the first winding shaft. With an intermediate clutch to wind,
The intermediate clutch is
A drive gear that rotates integrally with the second drive shaft;
A driven gear meshing with the drive gear;
A gear shaft integral with the first drive shaft;
Urging means for urging the gear shaft in the axial direction of the driven gear,
When the intermediate rail is pushed up by the bottom rail and the bottom rail and the intermediate rail are collectively lifted, the gear shaft is interlocked with the driven gear by the urging force of the urging means, and the driven gear and the first Interlocks with one drive shaft and transmits the rotation of the second drive shaft to the first drive shaft
Shielding device. The intermediate clutch includes a one-way clutch that transmits only the rotation in the pulling direction of the bottom rail of the second drive shaft to the drive gear.
The shielding apparatus according to claim 1.   The selection operation means is provided at one end of the head box,
  A lower limit device is provided at the other end of the head box to set the maximum rewind amount of the second lifting / lowering cord from the second winding shaft and set the lower limit position of the bottom rail. Is installed
  The shielding apparatus of Claim 1 or 2.   The intermediate clutch is held in the case
  The shielding apparatus of any one of Claims 1 thru | or 3.   When the operation cord is released after the lifting operation of the intermediate rail and the bottom rail, it further comprises a stopper device that shifts to a self-weight drop prevention operation of the intermediate rail and the bottom rail,
  The stopper device is incorporated in the intermediate clutch.
  The shielding apparatus according to claim 1.   The drive gear is provided at two locations with respect to the second drive shaft,
  The driven gear is also provided at two locations corresponding to the driving gear.
  The shielding apparatus according to claim 1.   In the intermediate clutch, the gear shaft is interlocked with the driven gear by the urging force of the urging means when the load of the intermediate rail is not applied to the first winding shaft.
  The shielding apparatus according to claim 1.   The intermediate clutch releases the interlock between the gear shaft and the driven gear against the urging force of the urging means when the load of the intermediate rail is acting on the first winding shaft. Have
  The shielding apparatus of Claim 1 or 7.