JP7068045B2 - Cloaking device - Google Patents

Description

The present invention relates to a shielding device such as a pleated screen, a horizontal blind, and a raised curtain that allows the bottom rail and the intermediate rail to be raised and lowered, respectively, and a driving device that can be used in the shielding device.

The pleated screen suspends and supports a screen that can be bent in a zigzag shape in the vertical direction from a head box, and raises and lowers the screen by an operating device to appropriately adjust the amount of lighting.

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

In Patent Document 1, when the load of the intermediate rail does not act on the first drive shaft for raising and lowering the intermediate rail, the first drive shaft is rotationally driven in conjunction with the second drive shaft for raising and lowering the bottom rail. The configuration to be made is disclosed. According to such a configuration, the occurrence of slackening of the elevating cord of the intermediate rail is suppressed.

Japanese Unexamined Patent Publication No. 2011-94458

In the configuration described in Patent Document 1, it is difficult to avoid the occurrence of slack in the elevating cord because the slack is detected after the elevating cord of the intermediate rail is slightly slackened.

The present invention has been made in view of such circumstances, and provides a drive device capable of avoiding slack in the elevating cord of the intermediate rail.

According to the present invention, it is a drive device including the first and second drive shafts and a clutch device, wherein the clutch device includes a clutch and first and second moving members, and the clutch is in a non-connected state. Then, the rotation of the second drive shaft is not transmitted to the first drive shaft, the rotation of the second drive shaft is transmitted to the first drive shaft in the connected state, and the first and second moving members are the first and the first, respectively. 2 It moves along the axis of the first and second drive shafts with the rotation of the drive shaft, and in the unconnected state, the second moving member is moved with the rotation of the second drive shaft to move the first movement. When the member is pressed to slide the first moving member in one direction along the axis of the first drive shaft, the clutch slides along with the slide movement to bring the clutch into the connected state. Provided.

In the present invention, the transmission / non-transmission of rotation from the second drive shaft to the first drive shaft is switched as the clutch slides. According to such a configuration, the clutch can be switched between connected and unconnected at any timing, so that the rotation from the second drive shaft to the first drive shaft can be performed before the elevating cord of the intermediate rail is slackened. It is possible to start the transmission, and it is possible to avoid the occurrence of slack in the elevating cord of the intermediate rail.

Hereinafter, various embodiments of the present invention will be illustrated. The embodiments shown below can be combined with each other.
Preferably, the drive device according to the above description, wherein the clutch device includes first and second gears, the second gear rotates with the rotation of the second drive shaft, and the first gear is a second gear. The clutch is a drive device that rotates with the rotation of the gear, does not rotate with the rotation of the first gear in the unconnected state, and rotates with the rotation of the first gear in the connected state.
Preferably, the drive device according to the above description, wherein the clutch device includes a clutch push, the clutch push slides with the clutch with the slide movement of the first moving member, and the clutch push is: It rotates with the rotation of the first drive shaft, and the clutch push is connected to the clutch via a coupling mechanism, and the coupling mechanism transmits the one-way rotation of the clutch to the clutch push. It is a drive device that does not transmit the one-way rotation of the clutch push to the clutch, or transmits it with a delay.
Preferably, the driving device according to the above description, wherein the clutch device includes an urging means, and the urging means urges the clutch and the clutch push toward a direction away from the first gear. It is a device.
Preferably, the shielding device includes an intermediate rail, a bottom rail, first and second elevating cords, first and second take-up shafts, and a drive device, wherein the drive device is the drive device described above. The first and second elevating cords suspend and support the intermediate rail and the bottom rail, respectively, and the first and second drive shafts take up the first and second elevating cords, respectively. It is a shielding device configured to switch the clutch from the unconnected state to the connected state when the second take-up shaft is rotationally driven to raise the bottom rail and the intermediate rail at the same time.

It is a front view of the pleated screen of one Embodiment of this invention. It is a right side view of the pleated screen of FIG. It is a top view of the pleated screen of FIG. It is sectional drawing which shows the detailed structure of operation apparatus 13. FIG. 5A shows a state in which the first moving member 39 is separated from the second moving member 40, FIG. 5A shows a detailed configuration of the clutch device 38, and FIG. 5B shows the intermediate rail 3 and the bottom rail 5 corresponding to FIG. 5A. It is a schematic diagram which shows the arrangement. The state in which the first moving member 39 is in contact with the second moving member 40 is shown, and FIGS. 6A to 6B are views corresponding to FIGS. 5A to 5B. The first moving member 39 presses the second moving member 40 to slide and move the clutch 41, and FIGS. 7A to 7B are views corresponding to FIGS. 5A to 5B. 8A to 8B show a state in which the diameter of the rotary spring 45 is reduced and lengthened by the rotation of the clutch 41, and FIGS. 8A to 8B are views corresponding to FIGS. 5A to 5B. 9A to 9B show a state in which the intermediate rail 3 and the bottom rail 5 are raised at the same time, and FIGS. 9A to 9B are views corresponding to FIGS. 5A to 5B. 9A to 9B show a state in which the intermediate rail 3 and the bottom rail 5 have their own weight lowered to the lower limit position, and FIGS. 9A to 9B are views corresponding to FIGS. 5A to 5B.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Various features in the embodiments shown below can be combined with each other. In addition, the invention is independently established for each characteristic item.

1. 1. Configuration of the pleated screen In the pleated screen shown in FIGS. 1 to 4, the upper screen 2 is suspended and supported from the head box 1 and the intermediate rail 3 is attached to the lower end of the upper screen 2. There is. The lower screen 4 is suspended and supported from the intermediate rail 3, and the bottom rail 5 is attached to the lower end of the lower screen 4.

The upper screen 2 is a semi-transparent fabric such as a lace fabric that can be folded in a zigzag shape, and the lower screen 4 is a fabric having a light-shielding property that can be folded in a zigzag shape.

The first and second elevating cords 6 and 7 are inserted on both sides of the upper screen 2 in the width direction, and the lower end of the first elevating cord 6 is attached to the intermediate rail 3. The second elevating cord 7 penetrates the intermediate rail 3 and is further inserted into the lower screen 4, and the lower end thereof is attached to the bottom rail 5.

The upper ends of the first and second elevating cords 6 and 7 are wound around the first and second winding shafts 9 and 10, which are rotatably supported by the support member 8 in the head box 1, respectively. That is, as shown in FIG. 3, the support members 8 are in a state where the first and second take-up shafts 9 and 10 are horizontally parallel to each other at positions above the first and second elevating cords 6 and 7 in the head box 1. It is rotatably supported.

Then, the upper end of the first elevating cord 6 is wound around the first take-up shaft 9, the upper end of the second elevating cord 7 is wound around the second take-up shaft 10, and the first and second elevating cords 6 are wound. , 7 are wound around the first and second winding shafts 9 and 10 in opposite directions to each other. 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 rod-shaped first drive shaft 11 is inserted into the first take-up shaft 9 so as to be relatively non-rotatable, and a hexagonal rod-shaped second drive shaft 12 is inserted into the second take-up shaft 10 so as to be relatively non-rotatable. .. Then, when the first drive shaft 11 is rotated in the winding direction of the first elevating cord 6, the first elevating cord 6 is wound around the first winding shaft 9, and the second drive shaft 12 is the second elevating cord. When rotated in the winding direction of 7, the second elevating cord 7 is wound around the second winding shaft 10.

An operating device 13 for rotationally driving 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 in the case 14 of the operating device 13, and an endless ball chain 16 is hooked on the pulley 15 and hung downward. There is. Then, the pulley 15 can be rotationally driven by operating the ball chain 16.

A gear 15a is integrally formed on 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 rotatably supported by the case 14 are meshed with the transmission gear 17 on both radial sides of the transmission gear 17. Then, 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 housed on the tip 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 clutch gears 18, It is fitted in the center of 19. 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 the rotation of the input shaft 22 in one direction to each output shaft 23, and the rotation directions of transmission are opposite to each other. 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 fitted to the output shaft 23 of the second transmission clutch 21.

With such a configuration, when the ball chain 16 is operated in the direction of arrow A shown in FIG. 2, for example, only the second drive shaft 12 is rotated, and the second take-up shaft 10 moves in the take-up direction of the second elevating cord 7. It is rotated.

Further, 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 take-up shaft 9 is rotated in the take-up direction of the first elevating cord 6.

The first and second drive shafts 11 and 12 are inserted into the stopper device 24 at the intermediate portion of the head box 1. The stopper device 24 has a known function of preventing the weight of the intermediate rail 3 and the bottom rail 5 from dropping when the ball chain 16 is released after the operation of pulling up the intermediate rail 3 or the bottom rail 5.

As shown in FIGS. 1 and 3, the first and second drive shafts 11 and 12 are inserted into the governor device 36 on the side of the stopper device 24, respectively. Each governor device 36 suppresses the rotation speeds of the first and second drive shafts 11 and 12 to a predetermined value or less, and suppresses the descent speed of the intermediate rail 3 and the bottom rail 5 when their own weight is lowered to a predetermined speed or less.

A clutch device 38 is disposed at the other end of the head box 1. As shown in FIG. 5A, the clutch device 38 includes a clutch 41, first and second moving members 39, 40, first and second gears 42, 43, a clutch push 44, and a rotary spring (“coupling mechanism”. (Example) 45, a coil spring (an example of the "urging means") 46, first and second screw shafts 47 and 48, and a case 49. The drive device of the present embodiment is configured by the first and second drive shafts 11 and 12 and the clutch device 38.

The clutch 41 does not transmit the rotation of the second drive shaft 12 to the first drive shaft 11 in the unconnected state, and transmits the rotation of the second drive shaft 12 to the first drive shaft 11 in the connected state.

The first and second moving members 39 and 40 are screwed to the first and second screw shafts 47 and 48, respectively, so as not to rotate with the rotation of the first and second screw shafts 47 and 48, respectively. It is configured. Therefore, the first and second moving members 39 and 40 are rotated along the first and second screw shafts 47 and 48 by the screw feed mechanism as the first and second screw shafts 47 and 48 rotate, respectively. Moving. The first and second screw shafts 47 and 48 have the same axis as the first and second drive shafts 11 and 12, respectively, and rotate with the rotation of the first and second drive shafts 11 and 12, respectively. Therefore, the first and second moving members 39 and 40 move along the axes of the first and second drive shafts 11 and 12, respectively, as the first and second drive shafts 11 and 12 rotate. ..

As shown in FIG. 5A, the second moving member 40 includes a rotatable member 40b, a slide member 40c, and a connecting spring 40d. The rotatable member 40b is screwed onto the second screw shaft 48. The connecting spring 40d is composed of a coil spring and is frictionally engaged with the rotatable member 40b by tightening the tubular portion 40b1 of the rotatable member 40b. Further, one end of the connecting spring 40d is engaged with the slide member 40c. The slide member 40c is non-rotatable and is configured to be slidable along the second screw axis. When the second screw shaft 48 rotates, the rotatable member 40b tries to rotate accordingly, but the force is transmitted to the slide member 40c via the connecting spring 40d, so that the rotation of the rotatable member 40b is prevented. To. Therefore, as the second screw shaft 48 rotates, the second moving member 40 moves along the second screw shaft 48 as a whole by the screw feed mechanism.

On the other hand, when the rotatable member 40b is gripped and a rotational force exceeding the frictional force between the rotatable member 40b and the connecting spring 40d is applied to the rotatable member 40b, the rotatable member 40b acts on the connecting spring 40d. By sliding, the rotatable member 40b rotates relative to the sliding member 40c and the connecting spring 40d. As a result, the rotatable member 40b can be moved along the second screw shaft 48 without rotating the second screw shaft 48. Further, since the slide member 40c and the connecting spring 40d also move with the movement of the rotatable member 40b, they can be moved along the second moving member 40 without rotating the second screw shaft 48. This function is available to adjust the lower limit position of the bottom rail 5 after assembling the product. For example, after assembling the product, the lower limit position of the bottom rail 5 can be lowered by grasping and rotating the rotatable member 40b to move the second moving member 40 to the left.

The second moving member 40 includes a contact portion 40a. When the second moving member 40 moves toward the first moving member 39, the abutting portion 40a abuts on the first moving member 39, and when the second moving member 40 is further moved in that state, the abutting portion 40a becomes a contact portion 40a. The first moving member 39 is pressed to slide the first moving member 39 in one direction (to the left in this embodiment) along the axis of the first drive shaft 11.

Since the first moving member 39 is screwed to the first screw shaft 47, the first screw shaft 47 also slides and moves with the sliding movement of the first moving member 39. Further, since the clutch push 44 is integrated with the first screw shaft 47, the clutch push 44 also slides and moves with the slide movement of the first screw shaft 47.

Further, the clutch push 44 is connected to the clutch 41 via a rotary spring 45. One end 45a of the rotary spring 45 is connected to the clutch push 44, and the other end 45b of the rotary spring 45 is connected to the clutch 41. The rotary spring 45 connects the clutch push 44 and the clutch 41 so that the clutch push 44 and the clutch 41 move integrally in the direction along the axis of the first drive shaft 11. Therefore, as the clutch push 44 slides, the clutch 41 also slides. Further, the rotary spring 45 transmits the one-way rotation of the clutch 41 to the clutch push 44, delays the one-way rotation of the clutch push 44, and transmits the one-way rotation to the clutch 41.

The first and second gears 42 and 43 are always in mesh with each other. The second gear 43 rotates with the rotation of the second drive shaft 12, and the first gear 42 rotates with the rotation of the second gear 43.

The clutch 41 has an engaging protrusion 41a. When the clutch 41 slides toward the first gear 42, the engaging projection 41a engages with the first gear 42, so that the clutch 41 shifts from the unengaged state to the engaged state, and the rotation of the first gear 42 rotates. It will be transmitted to the clutch 41.

The coil spring 46 urges the clutch 41 and the clutch push 44 in a direction away from the first gear 42. When the second moving member 40 is moved away from the first moving member 39 from the state where the second moving member 40 is pressing the first moving member 39, the first moving member 39 by the second moving member 40 is moved. The pressure is released. Then, the urging force of the coil spring 46 causes the clutch 41 and the clutch push 44 to move in a direction away from the first gear 42, and the engagement protrusion 41a and the first gear 42 are disengaged, so that the clutch 41 is disengaged. Transition from the connected state to the unconnected state.

2. 2. Operation of pleated screen Here, the operation of the pleated screen configured as described above will be described.

As shown in FIG. 5B, the initial state is a state in which the bottom rail 5 is in the lower limit position and the intermediate rail 3 is located substantially in the center of the head box 1 and the bottom rail 5. The intermediate rail 3 is held at the position shown in FIG. 5B by the self-weight drop prevention operation of the stopper device 24. The second moving member 40 moves to the right as the bottom rail 5 descends, but as shown in FIG. 5A, the right side of the second moving member 40 is in contact with the case 49, so that the second moving member 40 is in contact with the case 49. 40 cannot move further to the right. Therefore, the bottom rail 5 cannot be lowered any further, and the bottom rail 5 is held at the lower limit position.

When the ball chain 16 is pulled down in the direction of arrow A from the state shown in FIG. 5, only the second drive shaft 12 is rotated, the second elevating cord 7 is wound around the second take-up shaft 10, and the bottom rail 5 is pulled up. As shown in FIG. 6A, the second moving member 40 moves to the left with the rotation of the second drive shaft 12, and when the bottom rail 5 approaches or comes into contact with the intermediate rail 3, the second moving member 40 The contact portion 40a comes into contact with the first moving member 39. At this point, the rotation of the second drive shaft 12 is transmitted to the second gear 43 and the first gear 42, but since the clutch 41 and the first gear 42 are not connected, the first gear 42 The rotation of is not transmitted to the clutch 41. Therefore, the rotation of the second drive shaft 12 is not transmitted to the first drive shaft 11.

When the ball chain 16 is further pulled down in the direction of arrow A from the state of FIG. 6A, the second moving member 40 moves further to the left, and the contact portion 40a moves the first moving member 39 to the left, as shown in FIG. 7A. Press to slide to move. As the first moving member 39 slides, the clutch push 44, the rotary spring 45, and the clutch 41 also slide to the left, and the clutch 41 and the first gear 42 are engaged with each other to be in a connected state.

When the ball chain 16 is further pulled down in the direction of arrow A from the state of FIG. 7A, the rotation of the second drive shaft 12 is transmitted to the second gear 43, the first gear 42, the clutch 41, and the other end 45b of the rotary spring 45. At this time, as shown in FIG. 8A, the diameter of the rotary spring 45 is reduced and lengthened, so that the engagement between the clutch 41 and the first gear 42 becomes stronger. When the ball chain 16 is further pulled down in the direction of arrow A from this state, the rotation transmitted to the other end 45b of the rotary spring 45 is transmitted to the first drive shaft 11 via the clutch push 44. Then, as the first drive shaft 11 rotates, the first elevating cord 6 is wound around the first take-up shaft 9.

As described above, in the present embodiment, the second moving member 40 slides the first moving member 39 to switch the clutch 41 from the unconnected state to the connected state. Therefore, it is possible to start winding the first elevating cord 6 before the bottom rail 5 pushes up the intermediate rail 3 to cause slack in the first elevating cord 6. Therefore, according to the present embodiment, it is possible to avoid the occurrence of slack in the first elevating cord 6 of the intermediate rail 3.

When the ball chain 16 is further pulled down in the direction of arrow A from the state of FIG. 8, the rotation of the second drive shaft 12 is transmitted to the first drive shaft 11 and the first and second elevating cords 6 and 2 are transmitted as shown in FIG. The bottom rail 5 and the intermediate rail 3 rise at the same time while the 7 is wound around the first and second winding shafts 9 and 10.

Then, when the ball chain 16 is released after the bottom rail 5 and the intermediate rail 3 are pulled up to a desired height, as shown in FIG. 9, the bottom rail 5 and the intermediate rail 3 are at the desired height due to the self-weight drop prevention operation of the stopper device 24. It is held in the rail.

From this state, when the ball chain 16 is slightly pulled in the direction of arrow A, the first and second drive shafts 11 and 12 rotate slightly, and then when the ball chain 16 is released, the first and second drive shafts 16 and 2 are rotated. The self-weight drop prevention operation of both the stopper devices 24 of the drive shafts 11 and 12 is released, and the bottom rail 5 and the intermediate rail 3 are self-weight descent.

As the bottom rail 5 and the intermediate rail 3 drop by their own weight, the first and second moving members 39 and 40 move to the right, and as shown in FIG. 10, the second moving member 40 hits the case 49. At the time of contact, the descent of the bottom rail 5 and the intermediate rail 3 stops.

When the ball chain 16 is pulled down in the direction of arrow B from this state, the first drive shaft 11 is rotated, the first elevating cord 6 is wound around the first take-up shaft 9, and the intermediate rail 3 is pulled up. The rotation of the first drive shaft 11 is transmitted to the clutch push 44, one end 45a of the rotary spring 45, and the first screw shaft 47.

Immediately before the rotation is transmitted to one end 45a of the rotary spring 45, the diameter of the rotary spring 45 is reduced, and when the rotation is transmitted to one end 45a of the rotary spring 45, the diameter of the rotary spring 45 is reduced. Is returned to its natural size. During this period, the rotation applied to one end 45a of the rotary spring 45 is not transmitted to the clutch 41. After the rotary spring 45 returns to its natural size, the rotation applied to one end 45a of the rotary spring 45 is transmitted to the clutch 41 while the rotary spring 45 is further expanded in diameter. Therefore, the rotary spring 45 delays and transmits the rotation applied to one end 45a of the rotary spring 45. Further, since the rotary spring 45 is expanded in diameter, the rotary spring 45 is shortened, so that the clutch 41 and the first gear 42 are loosely engaged.

Further, when the first moving member 39 moves relative to the left direction with respect to the first screw shaft 47 with the rotation of the first screw shaft 47, the first moving member 39 by the second moving member 40 is correspondingly moved. The urging force of the coil spring 46 causes the clutch push 44, the rotary spring 45, the clutch 41, and the first screw shaft 47 to move to the right, and the clutch 41 and the first gear 42 are engaged with each other. Is released, and the clutch 41 and the first gear 42 are disconnected. Therefore, the rotation of the first drive shaft 11 is not transmitted to the second drive shaft 12.

When the ball chain 16 is further pulled down in the direction of arrow B, the first drive shaft 11 is rotated, the first elevating cord 6 is wound around the first take-up shaft 9, and the intermediate rail 3 is pulled up, as shown in FIG. It becomes a state.

When the ball chain 16 is released in this state, the intermediate rail 3 is held at a desired height by the self-weight drop prevention operation of the stopper device 24.

When the ball chain 16 is pulled in the direction of arrow B and then released from this state, the self-weight drop prevention operation of the stopper device 24 is released, and the intermediate rail 3 descends by its own weight. The weight of the intermediate rail 3 is lowered by either the intermediate rail 3 abuts on the bottom rail 5, the first moving member 39 abuts on the second moving member 40, or the ball chain 16 is operated to lower the weight of the stopper device 24. It can be stopped by activating the preventive action.

By the above method, the bottom rail 5 and the intermediate rail 3 can be held at arbitrary height positions.

3. 3. Other Embodiments-It can also be applied to shielding devices other than pleated screens (eg, horizontal blinds, raised curtains).
-The driving means of the first and second drive shafts may be electric.
-As the connecting mechanism, a one-way clutch may be provided instead of the rotary spring 45. In this case, in the one-way clutch, the one-way rotation of the clutch 41 (rotation of the intermediate rail 3 in the ascending direction) is transmitted to the clutch push 44, but the one-way rotation of the clutch push 44 (rotation of the intermediate rail 3 in the ascending direction) is transmitted. It is configured not to transmit to the clutch 41.
The second moving member 40 may be composed of one component.

1: Headbox 2: Upper screen 3: Intermediate rail 4: Lower screen 5: Bottom rail 6: 1st elevating cord 7: 2nd elevating cord 8: Support member 9: 1st take-up shaft 10: 2nd take-up shaft 11: 1st drive shaft 12: 2nd drive shaft 13: Operating device 14: Case 15: Pulley 15a: Gear 16: Ball chain 17: Transmission gear 18: 1st clutch gear 19: 2nd clutch gear 20: 1st transmission Clutch 21: Second transmission clutch 22: Input shaft 23: Output shaft 24: Stopper device 36: Governor device 38: Clutch device 39: First moving member 40: Second moving member 40a: Contact portion 40b: Rotable member 40b1 : Cylinder 40c: Slide member 40d: Connecting spring 41: Clutch 41a: Engagement protrusion 42: 1st gear 43: 2nd gear 44: Clutch push 45: Rotating spring 46: Coil spring 47: 1st screw shaft 48: 2nd Screw shaft 49: Case

Claims (4)

A cloaking device including an intermediate rail, a bottom rail, first and second elevating cords, first and second take-up shafts, and a drive device.
The drive device includes first and second drive shafts and a clutch device .
The clutch device includes a clutch and first and second moving members.
The clutch does not transmit the rotation of the second drive shaft to the first drive shaft in the unconnected state, but transmits the rotation of the second drive shaft to the first drive shaft in the connected state.
The first and second moving members move along the axes of the first and second drive shafts as the first and second drive shafts rotate, respectively.
In the unconnected state, the second moving member is moved along with the rotation of the second drive shaft to press the first moving member, and the first moving member is slid in one direction along the axis of the first drive shaft. When it is moved, the clutch slides along with this slide movement and becomes the connected state.
The first and second elevating cords suspend and support the intermediate rail and the bottom rail, respectively.
The first and second drive shafts rotationally drive the first and second take-up shafts that wind up the first and second lift cords, respectively.
A shielding device configured to switch the clutch from the unconnected state to the connected state when the bottom rail and the intermediate rail are raised at the same time . The shielding device according to claim 1.
The clutch device comprises first and second gears.
The second gear rotates with the rotation of the second drive shaft,
The first gear rotates with the rotation of the second gear,
The clutch is a shielding device that does not rotate with the rotation of the first gear in the unconnected state, but rotates with the rotation of the first gear in the engaged state. The shielding device according to claim 2.
The clutch device comprises a clutch push.
The clutch push slides with the clutch as the first moving member slides.
The clutch push rotates with the rotation of the first drive shaft, and
The clutch push is connected to the clutch via a coupling mechanism.
The coupling mechanism is a shielding device that transmits one-way rotation of the clutch to the clutch push, and does not transmit the one-way rotation of the clutch push to the clutch, or transmits it with a delay. The shielding device according to claim 3.
The clutch device comprises an urging means and
The urging means is a shielding device that urges the clutch and the clutch push in a direction away from the first gear.

Images