JP6971741B2 - Roll screen - Google Patents

Description

The present invention relates to a roll screen that is suspended and supported by stacking a plurality of screens, and more particularly to a roll screen that can adjust the amount of lighting in a room by adjusting the overlapping of the screens.

Conventionally, there is known a roll screen in which a double-stacked screen can be relatively moved in the vertical direction to adjust the amount of lighting in the room.

In such a roll screen, a translucent portion that partially transmits light and a light-shielding portion that blocks light are alternately formed in a striped pattern on the screen, and the screen is suspended and supported in a state where the screens are doubly overlapped. Has been done. Then, by operating the operating means, the front and rear screens are relatively moved in the vertical direction to adjust the degree of overlap between the translucent portion and the light-shielding portion, so that the amount of light collected can be adjusted.

In particular, there is disclosed a roll screen in which two screens are overlapped and the upper end of each screen is wound or rewound on a separate winding shaft so that the screen can be raised and lowered (for example, Patent Document 1). reference). In the roll screen disclosed in Patent Document 1, each take-up shaft is always rotated in the same direction in synchronization by the operation of the operation string, and the two screens are raised and lowered at the same time. In addition, when adjusting the amount of lighting, if the operation string is operated in the opposite direction after raising and lowering the screen, only one winding shaft is rotated within a predetermined rotation angle, and the translucent part and the light-shielding part are in the vertical direction. By moving relative to the light-transmitting part, the overlap width of the light-shielding part with respect to the light-transmitting part can be adjusted to adjust the amount of lighting. In the roll screen disclosed in Patent Document 1, the relative movement range of the screen can be adjusted from the outside.

On the other hand, there is disclosed a roll screen in which two screens are overlapped and the upper end of each screen is wound or rewound by a winding shaft having a double structure so that the screen can be raised and lowered (for example, Patent Document). 2). In the technique of Patent Document 4, two weight bars are individually attached to the lower end of each screen, a single cover for accommodating the two weight bars is provided, and the cover is applied to the two weight bars. It is configured to be relatively movable by its own weight, and when the overlapping width of the light-shielding portion with respect to the translucent portion is adjusted, the relative vertical movement of the two weight bars is performed inside the cover.

Japanese Patent No. 5539836 Japanese Patent No. 4800876

In the technique disclosed in Patent Document 1, there is a problem that the height of the weight bar provided at the lower limit of the screen moves up and down when adjusting the overlapping width of the light-shielding portion with respect to the translucent portion to adjust the amount of lighting. There is. When the height of the weight bar moves up and down like this, problems such as light leakage from the lower end of the weight bar and impaired airtightness occur.

Further, in the technique disclosed in Patent Document 2, there is a problem that a single cover accommodating two weight bars becomes larger in the height direction by the amount necessary for adjusting the amount of lighting, and the design is impaired. ..

For this reason, when adjusting the amount of lighting by the relative movement of the front and rear double screens, and when switching the elevating operation, the weight bar is prevented from moving up and down while suppressing the increase in size of the weight member (weight bar and bottom cover). In particular, a technique is desired in which a weight member at the lower limit position prevents light leakage from below in a manner in which the amount of daylighting can be adjusted, and a technique for enhancing airtightness in a manner in which the amount of airflow can be adjusted.

In view of the above-mentioned problems, an object of the present invention is to move the weight member up and down while suppressing an increase in size when adjusting the amount of lighting by relative movement of the front and rear double screens and when switching the elevating operation. The purpose is to provide a roll screen that can prevent this.

The roll screen of the present invention is a roll screen that suspends the front and rear double screens, and is used during a dimming operation for adjusting the overlap between the two winding shafts and the front and rear double screens. When one screen is wound by the winding shaft of, the other screen is rewound by the other winding shaft, and when the one screen is rewound by the one winding shaft, the other winding shaft is used. It is characterized by comprising a rotation direction switching mechanism capable of switching the rotation directions of the two winding shafts by winding the other screen.

Further, in the roll screen of the present invention, the rotation direction switching mechanism simultaneously rotates the two winding shafts in opposite directions during the dimming operation, and raises and lowers the front and rear double screens. In this case, the two take-up shafts are rotated in the same direction in the same direction, and when the dimming operation is changed to the elevating operation and the elevating operation is continuously changed to the dimming operation, the two take-up shafts are rotated. It is characterized in that it is configured to continuously switch the rotation direction of each other.

Further, in the roll screen of the present invention, the rotation direction switching mechanism is a drive gear that rotates in synchronization with the rotation of one of the take-up shafts, and a dimming operation and an elevating operation based on the rotation of the drive gear. The driven gear unit of the rotation direction switching type for switching the rotation direction of the other winding shaft with time and interlocking rotation is provided, and the rotation direction switching type driven gear unit has a first convex portion. The other winding shaft has an internal gear that rotates in conjunction with the rotation of the drive gear, and a second convex portion that causes a state of contact / non-contact with the first convex portion by a rotational action. a sun gear coupling to rotate, said to sun gear and meshed, and having a planetary gear meshing with the inner teeth formed on the internal gear, said internal gear and said sun gear and carrier rotates coaxially A braking member that applies a predetermined braking torque to the rotation of the carrier is provided, and by switching between contact and non-contact between the first convex portion of the internal gear and the second convex portion of the sun gear. It is characterized by being able to continuously switch between dimming operation and elevating operation.

Further, in the roll screen of the present invention, the dimming operation is enabled when the first convex portion of the internal gear maintains a non-contact state with the second convex portion of the sun gear, and the dimming operation is performed. At times, the carrier brakes within the range of the predetermined braking torque, and the sun gear operates so as to rotate synchronously in the opposite direction with respect to the internal gear via the planetary gear provided on the carrier. The elevating operation is possible when the first convex portion of the internal gear is maintained in contact with the second convex portion of the sun gear, and the carrier is opposed to the predetermined braking torque during the elevating operation. Further, the sun gear is integrally operated so as to rotate synchronously with the internal gear in the same direction.

Further, in the roll screen of the present invention, a weight member is provided at the lower end of the front and rear double screens, and the weight member pulls out the lower end of one of the screens from the weight member in response to an elevating operation and a dimming operation. When the lower end of the other screen is pulled into the weight member, and when the lower end of the other screen is pulled out from the weight member, the lower end of the one screen is pulled into the weight member. The amount of rotation related to switching between contact and non-contact between the convex portion of 1 and the second convex portion of the sun gear and the pull-in or pull-out amount of the weight member are determined by each of the front and rear double screens. It is characterized in that it corresponds to one pitch of a translucent portion and a light-shielding portion that are continuous at equal intervals.

According to the present invention, when the front-rear double screen is relatively moved, in particular, when the amount of lighting is adjusted by the relative movement of the front-rear double screen, and when the elevating operation is switched, the size of the weight member is suppressed. While it is possible to prevent the vertical movement of the weight member.

It is a front view which shows the schematic structure of the roll screen of one Embodiment by this invention. It is sectional drawing which shows the schematic structure of the roll screen of one Embodiment by this invention. It is sectional drawing which shows the schematic structure of the operation apparatus provided with the rotation direction switching mechanism of one Example in the roll screen of one Embodiment by this invention. (A), (b), and (c) are perspective views schematically showing the configuration of the rotation direction switching mechanism of one embodiment according to the present invention, respectively. It is an exploded perspective view which shows the schematic structure of the operation apparatus provided with the rotation direction switching mechanism of one Example in the roll screen of one Embodiment by this invention. (A) and (b) are side views which show the operation of the gear which concerns on the reversal switching of the rotation direction switching mechanism of one Embodiment which concerns on this invention, respectively. (A), (b), and (c) schematically show the operations during the lowering operation, the dimming operation by reverse switching, and the ascending operation of the rotation direction switching mechanism of one embodiment according to the present invention, respectively. It is a cross-sectional side view. (A), (b), and (c) are cross-sectional side views schematically showing the operations during the lowering operation, the dimming operation by inversion switching, and the ascending operation of the roll screen according to the embodiment of the present invention, respectively. Is.

Hereinafter, the roll screen of each embodiment according to the present invention will be described with reference to the drawings. In the specification of the present application, with respect to the front view of the roll screen shown in FIG. 1, the upper side and the lower side in the drawing are upward (or upper) and lower (or lower), respectively, according to the hanging direction of the screen. It will be defined and described by defining the left direction in the figure as the left side of the roll screen and the right direction in the figure as the right side of the roll screen. Further, in the example described below, the side to be visually recognized is the front side (or the indoor side) and the opposite side is the rear side (or the outdoor side) with respect to the front view of the roll screen shown in FIG.

(Structure of roll screen)
First, a roll screen according to an embodiment of the present invention will be described with reference to the drawings. In the roll screen of one embodiment shown in FIGS. 1 and 2, support brackets 3 are attached to both ends of a frame 2 attached to a mounting surface such as a window frame via the mounting bracket 1, and the support brackets 3 are attached to the support brackets 3. The two take-up shafts 4a and 4b are rotatably supported.

The take-up shafts 4a and 4b are supported by the support bracket 3 at predetermined intervals in the vertical direction and are supported in a state of being slightly offset in the front-rear direction.

The upper end of the first screen 5a on the outdoor side is attached to the take-up shaft 4a, and the upper end of the second screen 5b on the indoor side is attached to the take-up shaft 4b. The first and second screens 5a and 5b are hung so as to be overlapped with each other in close proximity to the take-up shafts 4a and 4b, respectively.

The take-up shafts 4a and 4b illustrated in FIG. 2 are configured to support the first and second screens 5a and 5b from the outdoor side thereof, respectively.

In the take-up shafts 4a and 4b, a spring motor 41 that reduces the operating force during hoisting of the first and second screens 5a and 5b, and a predetermined braking force are applied to the rotational torque of the take-up shafts 4a and 4b, respectively. The brake unit 42 and the like to be applied are housed.

The lower ends of the first and second screens 5a and 5b are attached to the weight bar 6 (see FIG. 2), and both ends of the weight bar 6 are rotatably supported by the bottom cover 7 having an upper opening. ing. Then, the first and second screens 5a and 5b are guided upward from the inside of the bottom cover 7 to the opening thereof. Such a weight bar 6 and a bottom cover 7 are configured as a weight member. Therefore, this weight member does not simply fix the lower ends of the first and second screens 5a and 5b to cause a weight action, but lower ends of the first screen 5a according to the elevating operation and the dimming operation. When pulling out the lower end of the second screen 5b from the bottom cover 7, pull the lower end of the second screen 5b into the bottom cover 7, and conversely, when pulling out the lower end of the second screen 5b from the bottom cover 7, pull the lower end of the first screen 5a into the bottom cover 7. The weight bar 6 is suspended and supported so as to be pulled into the screen to cause a weight action.

In the first and second screens 5a and 5b, a light-transmitting portion 8 that transmits light and a light-shielding portion 9 that blocks light are formed in a striped shape in the vertical direction at equal intervals. When the translucent portions 8 of the first and second screens 5a and 5b overlap each other in the front-rear direction, external light can be taken in from the translucent portion 8, and the translucent portions 8 and the first screen 5a of the first screen 5a can take in external light. When the light-shielding portion 9 of the two screens 5b overlaps in the front-rear direction and the light-shielding portion 9 of the first screen 5a and the translucent portion 8 of the second screen 5b overlap each other in the front-rear direction, external light can be blocked.

The translucent portions 8 provided on the first and second screens 5a and 5b can be configured to have high air permeability, and the light shielding portions 9 can be configured to have low air permeability. Therefore, the air permeability can be adjusted by adjusting the overlapping width of the light-shielding portion 9 with respect to the light-transmitting portion 8.

An operating device 10 is attached to the right support bracket 3 shown in FIG. 1, and an endless ball chain 11 is hung from the operating device 10. Then, by operating the ball chain 11, the winding shafts 4a and 4b can be synchronously rotated in the same direction at the same speed, and the first and second screens 5a and 5b can be raised and lowered collectively. There is.

The ball chain 11 is connected by a connector 12 to form an endless shape, and the regulating members 13a and 13b that regulate the elevating range of the first and second screens 5a and 5b are attached.

Then, when the first and second screens 5a and 5b are pulled up to the upper limit, the regulating member 13a abuts on the back surface side of the case 14 of the operating device 10, and further operation of the ball chain 11 in the same direction is performed. Be blocked. Further, when the first and second screens 5a and 5b are lowered to the lower limit, the regulating member 13b abuts on the front surface side of the case 14 to prevent further operation of the ball chain 11 in the same direction.

The connector 12 is composed of a ball locking portion for locking the ball of the ball chain 11 and a connecting portion for connecting the ball locking portion, and when pulled with a force equal to or higher than a preset tensile force, the connector 12 engages with the ball. The stop is designed to come off the connection.

By the way, in the roll screen of the present embodiment, when the ball chain 11 is pulled in the opposite direction after the first and second screens 5a and 5b are moved up and down, the take-up shafts 4a and 4b are moved in opposite directions within a predetermined rotation angle. The first and second screens 5a and 5b can be relatively moved up and down in opposite directions by rotating them synchronously at the same speed, thereby adjusting the degree of overlap between the light-transmitting portion 8 and the light-shielding portion 9. A dimming operation that allows the amount of light to be collected can be adjusted.

Switching between the elevating operation of rotating the take-up shafts 4a and 4b in the same direction and the dimming operation of rotating the take-up shafts 4a and 4b in opposite directions is possible by continuous operation, and the rotation direction described in detail later. This is realized by providing the switching mechanism 30 with respect to the rotating shafts of the take-up shafts 4a and 4b. That is, the rotation direction switching mechanism 30 rotates both the winding shafts 4a and 4b in the same direction by synchronous rotation when the first and second screens 5a and 5b are moved up and down, and the first and second screens 5a and 5b are rotated. At the time of dimming operation, the winding shafts 4a and 4b are rotated in opposite directions by synchronous rotation, and the elevating operation and the dimming operation can be switched in continuous operation.

Therefore, in the roll screen of the present embodiment, the first and second screens 5a and 5b are both wound or rewound by the same direction rotation of both the winding shafts 4a and 4b during the raising and lowering operation, and dimming is performed. At the time of operation, it is assumed that the winding operation of the other shaft is performed according to the winding operation of one of the winding shafts 4a and 4b (note that the winding operation of the other shaft is performed according to the rewinding operation of one shaft. In other words), it is possible to switch between the elevating operation and the dimming operation in a continuous operation.

(Rotation direction switching mechanism)
More specifically, the configuration of the rotation direction switching mechanism 30 will be described with reference to FIGS. 3 to 6. In the example of the present embodiment, as shown in FIGS. 3 and 4, the rotation direction switching mechanism 30 is incorporated in the operating device 10 having the pulley 15 for hooking the ball chain 11. However, the rotation direction switching mechanism 30 may be provided separately from the operating device 10 having the pulley 15, for example, the operating device 10 is provided on the right end side of the take-up shafts 4a and 4b as shown in FIG. At this time, the rotation direction switching mechanism 30 may be provided on the left end side of the take-up shafts 4a and 4b.

First, in the present embodiment, as shown in FIG. 1, a pulley 15 is rotatably supported in the case 14 of the operating device 10, and a ball chain 11 is mounted on the pulley 15. Then, the pulley 15 is rotated in the forward and reverse directions by the operation of the ball chain 11.

The rotation direction switching mechanism 30 in the present embodiment includes a drive gear 16, a transmission gear 17, and a rotation direction switching type driven gear unit 20. However, the rotation direction switching mechanism 30 may be configured not to have the transmission gear 17 or to be provided in a plurality of transmission gears 17. For example, when changing the distance or position of the take-up shafts 4a, 4b, or the hanging positions of the first and second screens 5a, 5b from the take-up shafts 4a, 4b (in this embodiment, all of them hang down from the outdoor side). In such cases, the necessity, number, and position of the transmission gear 17 are set as appropriate.

In this embodiment, as shown in FIG. 3, the drive gear 16 is rotatably supported by the columnar shaft portion 141 in the case 14 of the operating device 10. The drive gear 16 rotates integrally with the pulley 15. The rotation direction switching type driven gear unit 20 is rotatably supported by a columnar shaft portion 143 in the case 14. Then, the transmission gear 17 is rotatably supported by the columnar shaft portion 142 in the case 14, and the rotation of the drive gear 16 is transmitted to the driven gear unit 20 of the rotation direction switching type.

The central axis of the drive gear 16 is coaxial with the central axis of the take-up shaft 4b, and the drive gear 16 is located on the right end side of the take-up shaft 4b and is engaged with each other so as not to rotate relative to each other. Further, the central axis of the rotational direction switching type driven gear unit 20 is coaxial with the central axis of the take-up shaft 4a, and is a member constituting a part of the rotational direction switching type driven gear unit 20 (sun gear described later). 22) is located on the right end side of the take-up shaft 4a and is engaged so as not to rotate relative to each other.

The number of teeth of the drive gear 16 and the rotary direction switching type driven gear unit 20 is the same, and the tooth portions (the tooth portions 211 of the internal gear 21) in the drive gear 16, the transmission gear 17, and the rotary direction switching type driven gear unit 20. ) Are meshed with each other, and a rotational force is applied from the drive gear 16 that is rotated based on the operation of the ball chain 11 to the driven gear unit 20 that can switch the rotation direction via the transmission gear 17.

The transmission gear 17 has a central shaft hole 171 as shown in FIG. 4 (b), and the central shaft hole 171 is rotatably supported by a columnar shaft portion 142 extending from the case 14 (see FIG. 5).

In this example, the drive gear 16 is integrally formed with the pulley 15 as shown in FIG. 4 (c), has a central shaft hole 161 and the central shaft hole 161 is formed by a columnar shaft portion 141 extending from the case 14. It is rotatably supported (see FIG. 5). A pair of fan-shaped engaging recesses 162 are formed on the peripheral surface of the central shaft hole 161, and the pair of engaging recesses 162 are formed on the right end side of the take-up shaft 4b. Engages with the portion 43 (see FIG. 5), whereby the take-up shaft 4b is non-rotatably connected to the drive gear 16 and becomes rotatable integrally with the pulley 15.

Here, as shown in FIG. 4A, the rotational direction switching type driven gear unit 20 is composed of an internal gear 21, a sun gear 22, a carrier 23, a planetary gear 24, and a brake spring 25. This will be described with reference to FIG.

(Rotation direction switching type driven gear unit)
With reference to FIG. 5, the rotation direction switching type driven gear unit 20 is arranged in the accommodating portion 144 of the case 14. The brake spring 25 is engaged so as to tighten the peripheral wall of the columnar shaft portion 143 extending from the case 14, and the inner wall 232 of the cylindrical shaft cylinder portion 231 of the carrier 23 accommodates the brake spring 25. Is placed. At this time, both ends 25a and 25b of the brake spring 25 are engaged with a pair of holes 233 formed in the barrel portion 231 of the carrier 23, respectively. By the action of the brake spring 25, the carrier 23 is non-rotatably supported by the case 14 within a range of a predetermined braking torque, and when a rotational force exceeding the predetermined braking torque is applied to the carrier 23, the carrier 23 is subjected to. It becomes rotatable with respect to the case 14. Therefore, the pair of holes 233 engage the both end portions 25a and 25b of the brake spring 25 with a predetermined play, respectively, and the tightening force of the brake spring 25 with respect to the columnar shaft portion 143 extending from the case 14. Is designed to be relaxed.

The carrier 23 has an outer peripheral wall 234 that surrounds the axle cylinder portion 231 apart from each other, and a gear groove 234a is formed between the axle cylinder portion 231 and the outer peripheral wall 234. In this example, the outer peripheral wall 234 is formed with three planetary gear support portions 235 for arranging the three planetary gears 24 in rotational symmetry. The planetary gear support portion 235 penetrates the outer peripheral wall 234, and each planetary gear support portion 235 can rotate each planetary gear 24 by axially supporting the shaft pin 24a of each planetary gear 24 with a pin hole 236. I support it.

In each of the planetary gears 24 rotatably supported by the outer peripheral wall 234 in this way, the teeth of each planetary gear 24 slightly protrude inside and outside the outer peripheral wall 234.

The sun gear 22 has a shaft hole 221 in which the shaft hole 221 is rotatably supported by a cylindrical shaft cylinder portion 231 of the carrier 23, and is rotatable relative to the carrier 23. At this time, the sun gear 22 is placed in the gear groove 234a of the carrier 23, and the tooth portion of the sun gear 22 meshes with the tooth portion of each planetary gear 24 slightly protruding toward the gear groove 234a. .. A pair of fan-shaped engaging recesses 222a are formed on the peripheral surface of the cylindrical shaft cylinder portion 222 protruding to the left in the drawing from the sun gear 22 while having the shaft hole 221, and the pair of engaging recesses 222a are formed. , Engages with a pair of engaging protrusions 44 formed on the right end side of the take-up shaft 4a, whereby the take-up shaft 4a is non-rotatably connected to the sun gear 22 and is connected to the sun gear 22. It becomes possible to rotate as a unit.

Further, a convex portion 223 protruding in the out-of-diameter direction is formed on a part of the peripheral surface of the barrel portion 222 of the sun gear 22, and the convex portion 223 rotates along the top of the outer peripheral wall 234 in the carrier 23. It is movable.

The internal gear 21 has a shaft hole 210, and the shaft hole 210 allows the winding shaft 4a to engage with the sun gear 22 by penetrating the pair of engaging convex portions 44 in the winding shaft 4a. .. The internal gear 21 is placed so as to wrap around the sun gear 22 and the carrier 23, and the inner tooth portions 212 formed on the internal gear 21 slightly protrude outward from the carrier 23 with the tooth portions of the planetary gears 24. By meshing, they are individually and rotatably supported by both the sun gear 22 and the carrier 23.

Further, a convex portion 213 protruding in the radial direction is formed in a part of the shaft hole 210 of the internal gear 21, and the convex portion of the internal gear 21 is formed depending on the relative rotation position between the internal gear 21 and the sun gear 22. A state in which the 213 is in contact with the convex portion 223 of the sun gear 22 and a state in which the 213 is not in contact with the convex portion 223 are generated.

In the driven gear unit 20 of the rotation direction switching type, the tooth portion 211 of the internal gear 21 is the tooth portion of the transmission gear 17 with respect to the case 14 in which the tooth portion of the transmission gear 17 meshes with the drive gear 16 and is housed. It is arranged in the accommodating portion 144 of the case 14 so as to mesh with each other. Therefore, the internal gear 21 rotates in conjunction with the rotation of the drive gear 16.

As described above, the rotation direction switching mechanism 30 of the present embodiment is configured to include the drive gear 16, the transmission gear 17, and the driven gear unit 20 of the rotation direction switching type, and the rotation of the pulley 15 is the drive gear 16 and the transmission gear. It is transmitted to the tooth portion 211 of the internal gear 21 in the driven gear unit 20 of the rotation direction switching type via 17.

In the driven gear unit 20 of the rotation direction switching type, the carrier 23 generates a predetermined braking torque with respect to the case 14 by the action of the brake spring 25.

Therefore, when the convex portion 213 of the internal gear 21 maintains the non-contact state with the convex portion 223 of the sun gear 22, the rotation of the internal gear 21 (including forward / reverse rotation) is such that the carrier 23 with respect to the case 14. Braking is performed within the predetermined braking torque range without relative rotation, and the sun gear 22 is operated to rotate synchronously in the opposite direction with respect to the internal gear 21 via the planetary gear 24 provided on the carrier 23.

That is, the convex portion 213 of the internal gear 21 maintains a non-contact state with the convex portion 223 of the sun gear 22 and the internal gear 21 rotates in the direction of the solid line arrow A shown in FIGS. 6A and 6B. When the carrier 23 is in the range of the predetermined braking torque with respect to the case 14, the carrier 23 does not rotate relative to the case 14, and the sun gear 22 is in the opposite direction to the internal gear 21 via the planetary gear 24. Operates to rotate synchronously. As a result, the take-up shafts 4a and 4b can be synchronously rotated in opposite directions at the same speed, and the first and second screens 5a and 5b can be relatively moved up and down in opposite directions, that is, the translucent portion 8 and the light shielding portion 8 are shielded from light. It is possible to perform a dimming operation that adjusts the degree of overlap with the unit 9 so that the amount of light collected can be adjusted.

On the other hand, the rotation (including forward and reverse rotation) of the internal gear 21 when the convex portion 213 of the internal gear 21 maintains the state of being in contact with the convex portion 223 of the sun gear 22 is a carrier against the predetermined braking torque. The 23 and the sun gear 22 are integrally operated so as to rotate synchronously with the internal gear 21 in the same direction.

That is, when the internal gear 21 rotates while maintaining the state in which the convex portion 213 of the internal gear 21 is in contact with the convex portion 223 of the sun gear 22 in the direction of the solid line arrow A shown in FIGS. 6A and 6B. Is prevented from rotating the planetary gear 24, and the carrier 23 and the sun gear 22 are integrally rotated against the predetermined braking torque in the direction of the broken line arrow A which is the same direction as the internal gear 21. do. As a result, the winding shafts 4a and 4b can be synchronously rotated in the same direction at the same speed, and the first and second screens 5a and 5b can be moved up and down collectively.

Then, the convex portion 213 of the internal gear 21 can be continuously changed from the state of being in contact with the convex portion 223 of the sun gear 22 to the state of being non-contact, or from the state of being non-contact to the state of being in contact. Therefore, the rotation direction switching mechanism 30 of the present embodiment can not only continuously switch from the elevating operation to the dimming operation by switching the forward / reverse rotation of the pulley 15, but also the pulley 15 can switch the forward / reverse rotation. When continuously rotating in the forward or reverse direction, the rotation of the sun gear 22 is switched (always rotating) with respect to the rotation of the internal gear 21 without stopping, whereby the first and first rotations are performed. The dimming operation can be continuously switched to the elevating operation without causing undesired slack in the two screens 5a and 5b.

Therefore, the rotation direction switching mechanism 30 of the present embodiment simultaneously rotates the take-up shafts 4a and 4b in opposite directions to the rotation of the pulley 15 related to the dimming operation and the elevating operation during the dimming operation, and at the time of the elevating operation. The take-up shafts 4a and 4b are rotated in the same direction in the same direction, and the rotation of the take-up shafts 4a and 4b is stopped when the dimming operation is continuously changed to the elevating operation and the elevating operation is changed to the dimming operation. The rotation directions of the take-up shafts 4a and 4b can be continuously switched without any problem.

(Overall operation of the roll screen)
Here, the overall operation of the roll screen will be described with reference to FIGS. 7 and 8. Here, an example of continuously shifting from the descending operation to the ascending operation through the dimming operation will be described.

[During the descent operation]
FIG. 7A schematically shows the operation of the rotation direction switching mechanism 30 according to the present invention during the lowering operation, and FIG. 8A shows the lowering operation of the roll screen of the present embodiment. It outlines the behavior of the time.

First, during the lowering operation of the first and second screens 5a and 5b shown in FIG. 7A, the drive gear 16 rotates integrally with the rotation of the pulley 15 (see FIG. 4C). The take-up shaft 4b engaged with the drive gear 16 rotates in the rewinding direction of the second screen 5b (see FIG. 8A). The rotation of the drive gear 16 is transmitted to the internal gear 21 in the driven gear unit 20 of the rotation direction switching type via the transmission gear 17, and the internal gear 21 rotates in the same direction as the drive gear 16 at the same speed.

At this time, in the rotary direction switching type driven gear unit 20, the carrier 23 generates a predetermined braking torque with respect to the case 14 due to the action of the brake spring 25 (see FIG. 5), but the internal gear 21 is convex. The portion 213 maintains a state of being in contact with the convex portion 223 of the sun gear 22, the rotation of the planetary gear 24 is prevented, and the carrier 23 and the sun gear 22 are integrated against the predetermined braking torque. It rotates synchronously with the internal gear 21 in the same direction.

Therefore, when the first and second screens 5a and 5b shown in FIG. 7A are lowered, the sun gear 22 rotates in the same direction as the drive gear 16 at the same speed, and the sun gear 22 rotates at the same speed. The take-up shaft 4a that engages with the first screen 5a rotates in the rewinding direction (see FIG. 8A).

Then, when the first and second screens 5a and 5b are lowered, the light-transmitting portion 8 of the first screen 5a and the light-shielding portion 9 of the second screen 5b overlap in the front-rear direction, and the light-shielding portion 9 of the first screen 5a is overlapped. And the translucent portion 8 of the second screen 5b are maintained to overlap in the front-rear direction, and the first and second screens 5a and 5b are lowered. Therefore, for example, as shown in FIG. 8A, the bottom cover 7 is on the floor. By lowering from the surface to the lower limit position where the height h (≧ 0), the shielded state can be obtained.

[During dimming operation]
FIG. 7 (b) schematically shows an operation during a dimming operation switched from the lowering operation of the rotation direction switching mechanism 30 of the embodiment according to the present invention, and FIG. 8 (b) shows the present embodiment. The operation during the dimming operation switched from the lowering operation of the roll screen of is schematically shown. In particular, FIG. 8B schematically shows the operation during the dimming operation from the lower limit positions of the first and second screens 5a and 5b shown in FIG. 8A.

First, during the dimming operation of the first and second screens 5a and 5b shown in FIG. 7B, the drive gear 16 that rotates in the opposite direction as a switch from the lowering operation shown in FIG. 7A is used. It rotates integrally with the rotation of the pulley 15 (see FIG. 4 (c)), and the take-up shaft 4b engaged with the drive gear 16 rotates in the take-up direction of the second screen 5b (FIG. 8 (b)). reference). The rotation of the drive gear 16 is transmitted to the internal gear 21 in the driven gear unit 20 of the rotation direction switching type via the transmission gear 17, and the internal gear 21 rotates in the same direction as the drive gear 16 at the same speed.

At this time, in the rotary direction switching type driven gear unit 20, the carrier 23 generates a predetermined braking torque with respect to the case 14 by the action of the brake spring 25 (see FIG. 5), and the convex portion of the internal gear 21. When the internal gear 21 rotates while maintaining the state in which the 213 is not in contact with the convex portion 223 of the sun gear 22, the carrier 23 is within the range of the predetermined braking torque with respect to the case 14 and rotates relative to the case 14. Instead, the sun gear 22 rotates synchronously in the opposite direction to the internal gear 21 via the planetary gear 24.

Therefore, during the dimming operation of the first and second screens 5a and 5b shown in FIG. 7B, the sun gear 22 rotates at the same speed in the opposite direction to the drive gear 16 and the sun gear 22. The take-up shaft 4a that engages with 22 rotates in the rewinding direction of the first screen 5a (see FIG. 8B).

In this way, since the first screen 5a is rewound according to the winding amount of the second screen 5b, the weight bar 6 and the bottom cover 7 do not move up and down. Then, the first and second screens 5a and 5b can be relatively moved up and down in opposite directions, that is, a dimming operation that can adjust the degree of overlap between the translucent portion 8 and the light shielding portion 9 to adjust the amount of lighting. It will be possible.

As long as the convex portion 213 of the internal gear 21 is not in contact with the convex portion 223 of the sun gear 22, the weight bar 6 can be rotated in the forward and reverse directions of the pulley 15 (that is, the drive gear 16). Since the bottom cover 7 does not move up and down, the usability of the dimming operation is improved.

Further, the lower ends of the first and second screens 5a and 5b are attached to the weight bar 6, and both ends of the weight bar 6 are rotatably supported by the bottom cover 7 having an upper opening. Such a weight bar 6 and a bottom cover 7 are configured as a weight member, and the weight member does not simply fix the lower ends of the first and second screens 5a and 5b to cause a weight action, but moves up and down. When the lower end of the first screen 5a is pulled out from the bottom cover 7 according to the operation and the dimming operation, the lower end of the second screen 5b is pulled into the bottom cover 7, and conversely, the lower end of the second screen 5b is pulled out from the bottom cover 7. When pulling out from the screen, the lower end of the first screen 5a is pulled into the bottom cover 7 to suspend and support the weight bar 6 to cause a weight action.

The rotation amount and the rotation amount (pull-in or pull-out amount) of the weight bar 6 related to the switching between the contact / non-contact between the convex portion 213 of the internal gear 21 and the convex portion 223 of the sun gear 22 are the first and the first. Each of the second screens 5a and 5b corresponds to one pitch of the translucent portion 8 and the light-shielding portion 9 which are continuous at predetermined intervals. In this example, one pitch is formed by setting the vertical length of the light-shielding portion 9 to be about twice the vertical length of the light-transmitting portion 8.

[At the time of ascending operation]
FIG. 7 (c) schematically shows the operation of the rotation direction switching mechanism 30 according to the present invention during the ascending operation, which continuously shifts from the dimming operation, and FIG. 8 (c) shows. The operation during the ascending operation, which continuously shifts from the dimming operation of the roll screen of the present embodiment, is schematically shown.

First, during the ascending operation of the first and second screens 5a and 5b shown in FIG. 7C, the drive gear 16 that rotates in the direction opposite to the descending operation shown in FIG. 7A is the pulley 15. It rotates integrally with the rotation (see FIG. 4 (c)), and the take-up shaft 4b engaged with the drive gear 16 rotates in the take-up direction of the second screen 5b (see FIG. 8 (c)). The rotation of the drive gear 16 is transmitted to the internal gear 21 in the driven gear unit 20 of the rotation direction switching type via the transmission gear 17, and the internal gear 21 rotates in the same direction as the drive gear 16 at the same speed.

At this time, in the rotary direction switching type driven gear unit 20, the carrier 23 generates a predetermined braking torque with respect to the case 14 due to the action of the brake spring 25 (see FIG. 5), but the internal gear 21 is convex. The portion 213 maintains a state of being in contact with the convex portion 223 of the sun gear 22, the rotation of the planetary gear 24 is prevented, and the carrier 23 and the sun gear 22 are integrated against the predetermined braking torque. It rotates synchronously with the internal gear 21 in the same direction.

Therefore, when the first and second screens 5a and 5b shown in FIG. 7C are raised, the sun gear 22 rotates in the same direction as the drive gear 16 at the same speed, and the sun gear 22 rotates at the same speed. The take-up shaft 4a that engages with the first screen 5a rotates in the take-up direction (see FIG. 8C).

Then, the first and second screens 5a and 5b can be raised to a desired height to be in the released state.

The amount of rotation and the amount of rotation of the weight bar 6 related to switching between contact and non-contact between the convex portion 213 of the internal gear 21 and the convex portion 223 of the sun gear 22 are the first and second screens 5a and 5b. Each of them corresponds to one pitch of the translucent portion 8 and the light-shielding portion 9 which are continuous at predetermined intervals. Therefore, assuming that the winding shafts 4a and 4b have the same diameter, the point A on the peripheral surface of the winding shaft 4a and the point B on the peripheral surface of the winding shaft 4b shown in FIG. 8A can be referred to. As shown in FIG. 8B, the dimming operation is performed within a range in which the take-up shaft 4a rotates clockwise as shown in the figure, and the take-up shaft 4b rotates counterclockwise as shown in synchronization with this. The degree of overlap between the translucent portion 8 and the light-shielding portion 9 can be adjusted. Further, in the ascending operation, as shown in FIG. 8C, the phase difference (rotation angle difference) between the point A on the peripheral surface of the winding shaft 4a and the point B on the peripheral surface of the winding shaft 4b is maintained. Both the take-up shafts 4a and 4b rotate in the take-up direction of the first and second screens 5a and 5b in synchronization with each other. Therefore, the translucent portions 8 of the first and second screens 5a and 5b overlap each other in the front-rear direction without causing the first and second screens 5a and 5b to loosen during this ascending operation, and the light-shielding portions 9 also overlap. The first and second screens 5a and 5b are raised while maintaining the overlapping state in the front-rear direction.

Further, since the same operation is performed when the dimming operation is continuously shifted to the lowering operation, the first and second screens 5a and 5b are not slackened in the lowering operation, for example, as shown in FIG. 8A. The translucent portion 8 of the first screen 5a and the light-shielding portion 9 of the second screen 5b overlap in the front-rear direction up to the lower limit position of the bottom cover 7 shown, and the light-shielding portion 9 of the first screen 5a and the light-transmitting portion 9 of the second screen 5b are transparent. The first and second screens 5a and 5b are lowered while maintaining the state in which the portions 8 overlap each other in the front-rear direction.

As described above, in the present embodiment, when the ball chain 11 is operated in the reverse direction and the drive gear 16 is rotated in the reverse direction after the first and second screens 5a and 5b are collectively moved up and down. By the action of the rotation direction switching mechanism 30, the take-up shaft 4a is rotated in the direction opposite to the take-up shaft 4b, and the dimming operation becomes possible. Therefore, the first screen 5a is rewound or rewound according to the winding amount of the second screen 5b by the dimming operation by rotating the winding shaft 4a in the direction opposite to the winding shaft 4b. Since the first screen 5a is wound according to the rewinding amount of the two screens 5b, the weight bar 6 and the bottom cover 7 hardly move up and down.

Therefore, the roll screen of the present embodiment can adjust the amount of lighting without moving the weight bar 6 and the bottom cover 7 up and down.

Since the dimming operation in the roll screen of the present embodiment operates in the same manner regardless of whether the weight bar 6 and the bottom cover 7 are in the lower limit position, the weight bar 6 and the bottom cover 7 are operated at arbitrary positions. It is possible to realize a roll screen having a dimming function or a ventilation adjustment function.

In particular, when the bottom cover 7 is in the lower limit position, it is possible to prevent light leakage from below the bottom cover 7 in a manner in which the amount of light collected can be adjusted, and from below the bottom cover 7 in a manner in which the amount of airflow can be adjusted. Can increase the airtightness of.

Further, it contributes to the miniaturization of the weight bar 6 and the bottom cover 7 rather than the configuration in which the bottom cover 7 can be moved relative to the weight bar 6.

In particular, in the present embodiment, the front and rear double first and second screens 5a and 5b are configured to be closer to each other or in close contact with each other without moving the weight bar 6 and the bottom cover 7 up and down, and the first and first screens are first and second. Since the lighting amount can be adjusted without causing the two screens 5a and 5b to loosen, the usability is improved.

Although the present invention has been described above with reference to examples of specific embodiments, the present invention is not limited to the examples of the above-described embodiments, and can be variously modified without departing from the technical idea. For example, in the example of the above-described embodiment, the operation using the ball chain for the rotation operation of the take-up shafts 4a and 4b has been described as an example, but the rotation operation may be performed by the string-shaped operation code.

Further, in the example of the above-described embodiment, the example in which the rotation direction switching mechanism 30 is incorporated in the operating device 10 has been mainly described, but the rotation direction switching mechanism 30 is separated from the operating device 10 having the pulley 15. For example, when the operating device 10 is provided on the right end side of the take-up shafts 4a and 4b as shown in FIG. 1, the rotation direction switching mechanism 30 is provided on the left end side of the take-up shafts 4a and 4b. May be good.

Further, in the example of the above-described embodiment, the example in which the rotation direction switching mechanism 30 mainly includes the drive gear 16, the transmission gear 17, and the rotation direction switching type driven gear unit 20 has been described, but the rotation direction switching mechanism 30 has been described. Can be configured not to provide the transmission gear 17, or may be configured to provide a plurality of transmission gears 17.

Further, in the example of the above-described embodiment, an example in which the brake spring 25 is used as a braking member in order to mainly generate a predetermined braking torque in the carrier 23 has been described, but the carrier 23 is generated in a predetermined braking torque. However, for example, a rubber material may be used.

Further, in the example of the above-described embodiment, the rotation direction switching mechanism 30 mainly synchronizes the take-up shafts 4a and 4b in opposite directions with respect to the rotation of the pulley 15 related to the dimming operation and the elevating operation during the dimming operation. The take-up shafts 4a and 4b are rotated in the same direction during the elevating operation, and the take-up shafts 4a and 4b are continuously rotated from the dimming operation to the elevating operation and from the elevating operation to the dimming operation. The rotation direction switching type driven gear unit 20 associated with the rotation of the take-up shaft 4a has a main function of continuously switching the rotation directions of the take-up shafts 4a and 4b without stopping the rotation of the take-up shaft 4a. An example has been described, but it is not necessary to limit it to this. For example, the gear that rotates the take-up shaft 4a is composed of a mere spur gear driven gear, and the rotation of the take-up shaft 4b is provided with the same function as the rotation direction switching type driven gear unit 20 to provide the same function as the rotation direction switching type driven gear unit 20. Transmission that constitutes the switching mechanism 30 and transmits the rotation of the drive gear 16 that rotates integrally with the rotation of the take-up shaft 4b to a driven gear of a mere spur gear for rotating the take-up shaft 4a. It is also possible to configure the rotation direction switching mechanism 30 by giving the gear the same function as the driven gear unit 20.

According to the present invention, it is possible to prevent the weight member from moving up and down while suppressing the enlargement of the weight member when adjusting the amount of lighting by the relative movement of the front and rear double screens and when switching the elevating operation. It is useful for roll screen applications with double screens.

1 Mounting bracket 2 Frame 3 Support bracket 4a, 4b Winding shaft 5a 1st screen 5b 2nd screen 6 Weight bar 7 Bottom cover 8 Translucent part 9 Light-shielding part 10 Shading part 10 Operating device 11 Ball chain 14 Operating device case 16 Drive gear 17 Transmission gear 20 Rotational direction switching driven gear unit 21 Internal gear 22 Sun gear 23 Carrier 24 Planetary gear 25 Brake spring 30 Rotational direction switching mechanism

Claims (5)

It is a roll screen that hangs double screens in the front and back.
Two take-up shafts and
When winding one screen with one winding shaft during the dimming operation to adjust the overlap of the front and rear double screens, the other screen is rewound with the other winding shaft, and the other screen is wound. When the one screen is rewound by the take-up shaft, the other take-up shaft is used to take up the other screen, so that the rotation directions of the two take-up shafts can be switched. ,
A roll screen characterized by being equipped with. The rotation direction switching mechanism simultaneously rotates the two winding shafts in opposite directions during the dimming operation, and winds the two winding shafts when raising and lowering the front and rear double screens. When the shafts are rotated synchronously in the same direction and the dimming operation is continuously changed to the elevating operation and the elevating operation is continuously changed to the dimming operation, the rotation directions of the two take-up shafts are continuously rotated. The roll screen according to claim 1, wherein the roll screen is configured to be switched. The rotation direction switching mechanism is a drive gear that rotates in synchronization with the rotation of one of the take-up shafts, and the other take-up shaft during a dimming operation and an elevating operation based on the rotation of the drive gear. Equipped with a rotation direction switching type driven gear unit for switching the rotation direction of
The rotation direction switching type driven gear unit is
An internal gear having a first convex portion and rotating in conjunction with the rotation of the drive gear,
A sun gear having a second convex portion that causes a contact / non-contact state with the first convex portion by a rotational action and connecting the other winding shaft so as to rotate.
A carrier aforementioned sun gear and meshed, and having a planetary gear meshing with the inner teeth formed on the internal gear and rotates coaxially with the internal gear and the sun gear,
A braking member that applies a predetermined braking torque to the rotation of the carrier is provided.
The feature is that the dimming operation and the elevating operation can be continuously switched by switching the contact / non-contact between the first convex portion of the internal gear and the second convex portion of the sun gear. The roll screen according to claim 1 or 2. A dimming operation is possible when the first convex portion of the internal gear maintains a non-contact state with respect to the second convex portion of the sun gear, and the carrier performs the predetermined braking during the dimming operation. It brakes within the range of torque, and operates so that the sun gear rotates synchronously in the opposite direction with respect to the internal gear via the planetary gear provided on the carrier.
The elevating operation is possible when the first convex portion of the internal gear is maintained in contact with the second convex portion of the sun gear, and the carrier is opposed to the predetermined braking torque during the elevating operation. The roll screen according to claim 3 , wherein the sun gear is integrally operated so as to rotate synchronously with the internal gear in the same direction. A weight member is provided at the lower end of the front and rear double screens, and the weight member uses the lower end of the other screen when the lower end of the one screen is pulled out from the weight member in response to an elevating operation and a dimming operation. When it is pulled into the weight member and the lower end of the other screen is pulled out from the weight member, the lower end of the one screen is pulled into the weight member.
The amount of rotation related to switching between contact and non-contact between the first convex portion of the internal gear and the second convex portion of the sun gear and the pull-in or pull-out amount of the weight member are double front and rear. The roll screen according to claim 3 or 4, wherein each of the screens corresponds to one pitch of a translucent portion and a light-shielding portion that are continuous at equal intervals.

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