JP6720024B2 - Roll screen - Google Patents

Description

The present invention relates to a roll screen that suspends and supports a plurality of screens in a stacked state, and particularly relates to a roll screen that is capable of adjusting the amount of light to enter the room by adjusting how the screens overlap.

BACKGROUND ART Conventionally, there has been proposed a roll screen in which double-overlaid screens are relatively moved in the vertical direction so that the amount of daylight can be adjusted into the room (see, for example, Patent Document 1).

In such a roll screen, a light-transmitting portion that partially transmits light and a light-shielding portion that blocks light are alternately formed on the screen in a striped pattern, and the screen is suspended and supported in a state of being double-laid. 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 light-transmitting portion and the light-shielding portion, whereby the amount of light can be adjusted.

Further, there is disclosed a roll screen in which two screens are superposed, and the upper end portions of the screens are wound or unwound on separate winding shafts so that the screens can be moved up and down (for example, Patent Document 2). reference). In the roll screen disclosed in Patent Document 2, the winding shafts are always rotated in the same direction in synchronization with each other by the operation of the operation string, and the two screens are simultaneously moved up and down. When adjusting the amount of light, if the operating string is operated in the opposite direction after the screen is raised or lowered, only one winding shaft will be rotated within the specified rotation angle, and the light-transmitting part and the light-shielding part will move in the vertical direction. By relatively moving to, the overlapping width of the light-shielding portion with respect to the light-transmitting portion can be adjusted and the amount of light can be adjusted. In the roll screen disclosed in Patent Document 2, 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 superposed and the upper end of each screen is wound or unwound by a winding shaft having a double structure so that the screens can be moved up and down (for example, Patent Document 1). 3). In the technique of Patent Document 3, two weight bars are individually attached to the lower end portions of the respective screens, a single cover for accommodating the two weight bars is provided, and the cover is provided for 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 light transmitting portion is adjusted, relative vertical movement of the two weight bars is performed inside the cover.

Japanese Patent No. 3349812 Patent No. 5539836 Japanese Patent No. 4800876

In the techniques disclosed in Patent Documents 1 and 2, when adjusting the overlapping width of the light-shielding portion with respect to the light-transmitting portion to adjust the amount of light, the height of the weight bar provided at the lower limit of the screen moves up and down. There is a problem. When such a vertical movement of the weight bar occurs, problems such as light leakage from the lower end portion of the weight bar and impairing the airtightness occur.

Further, in the technique disclosed in Patent Document 3, there is a problem that a single cover that accommodates the two weight bars is upsized in the height direction by an amount necessary for adjusting the lighting amount, and the design is impaired. ..

For this reason, when adjusting the amount of light by relative movement of the front and rear double screens, and when switching between lifting and lowering operations, the vertical movement of the weight bar is prevented while preventing the weight bar from moving up and down, especially at the lower limit position. Therefore, a technique for preventing light leakage from the lower side in a manner in which the amount of light collected can be adjusted and for enhancing airtightness in a manner in which the amount of ventilation can be adjusted is desired.

In view of the above-mentioned problem, an object of the present invention is to move the weight bar up and down while suppressing an increase in the size of the weight bar when adjusting the amount of lighting by relative movement of the front and rear double screens, and when switching the lifting operation. It is to provide a roll screen capable of preventing such a situation.

The roll screen of the present invention is a roll screen for suspending a front and rear double screen, in which the upper ends of the first and second screens of the front and rear double screen are idled so as to have a predetermined relative movement range. A winding means capable of winding or rewinding, and a weight member for stretching the front and rear double screens, the weight member including a bottom frame for fixing a lower end portion of the first screen. A rotating member for preliminarily holding the lower end portion of the second screen so that the lower end portion can be taken in and out.

Further, in the roll screen of the present invention, the weight member further includes an urging means for urging the rotating member so as to preliminarily hold the lower end portion of the second screen in a length corresponding to the relative movement range. It is characterized by being provided.

Further, in the roll screen of the present invention, the rotating member is arranged adjacent to the bottom frame or is housed in the bottom frame.

Further, in the roll screen of the present invention, each of the first screen and the second screen has a light-transmitting portion and a light-shielding portion, and it is possible to switch between a light-transmitting state and a light-shielding state in the front and rear double screens. It is characterized by being configured.

Further, the roll screen of the present invention is characterized in that the predetermined relative movement range is set to be equal to or larger than a range which enables switching between a light-transmitting state and a light-shielding state in the front and rear double screens.

Further, in the roll screen of the present invention, the winding means is configured to provide the two winding shafts respectively suspending the first screen and the second screen and the front and rear double screens with the relative movement range. It is characterized by having an idling mechanism for idling.

Further, in the roll screen of the present invention, the first screen and the second screen are staggered patterns including a parallel pattern in which a light-transmitting portion and a light-shielding portion are alternately repeated at the same pitch, an oblique parallel pattern, or a checkered pattern, or When the weight member is at the lower limit position, one or both of a predetermined upper end vicinity area and a lower end vicinity area have a multi-region pattern having a plurality of regions capable of switching between a light-transmitting state and a light-shielding state. And

According to the present invention, the vertical movement of the weight bar can be prevented when the front and rear double screens are relatively moved. In particular, when adjusting the amount of lighting by relative movement of the front and rear double screens, and further when switching the lifting operation, it is possible to prevent the weight bar from moving up and down while suppressing an increase in size of the weight bar.

It is a front view showing a schematic structure of a roll screen of a 1st embodiment by the present invention. It is a sectional side view showing a schematic structure of a roll screen of a 1st embodiment by the present invention. (A), (b) is a cross-sectional side view which shows the schematic structure of the operating device in the roll screen of 1st Embodiment by this invention, and an exploded perspective view which shows the structure of the driven gear, respectively. (A), (b) is a perspective view and a sectional side view which partially show the schematic structure of the weight bar of one example in the roll screen of a 1st embodiment by the present invention, respectively. (A), (b), and (c), (d) are sectional side views of a driven gear and a weight bar, respectively, for explaining the operation of the weight bar in the roll screen of the first embodiment according to the present invention. .. (A), (b) is a perspective view which shows partially the schematic structure of the weight bar of the 1st modification in the roll screen of 1st Embodiment by this invention, and a corresponding cross-sectional side view, respectively. (A), (b) is a perspective view which shows partially the schematic structure of the weight bar of the 2nd modification in the roll screen of 1st Embodiment by this invention, and a corresponding cross-sectional side view, respectively. (A), (b) is a cross-sectional side view which shows schematic structure of the roll screen of 2nd Embodiment by this invention, and schematic structure of an operating device, respectively. (A) thru|or (d) are the perspective views and sectional side views which show schematic structure of the winding shaft of the modification respectively applicable to the roll screen of each embodiment by this invention. (A) thru|or (c) are front views which show the schematic structure of the screen which has the cloth|dough of the modification applicable to the roll screen of each embodiment by this invention, respectively.

A roll screen according to each embodiment of the present invention will be described below 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 respectively referred to as an upward direction (or an upper side) and a downward direction (or a lower side) in accordance with the hanging direction of the screen. The left direction of the drawing is defined as the left side of the roll screen, and the right direction of the drawing is defined as the right side of the roll screen. Further, in the example described below, with respect to the front view of the roll screen shown in FIG. 1, the visually recognizable side is the front side (or the indoor side) and the opposite side is the rear side (or the outdoor side).

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

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

The upper end of the outdoor first screen 5a is attached to the winding shaft 4a, and the upper end of the indoor second screen 5b is attached to the winding shaft 4b. The first and second screens 5a and 5b are suspended from the winding shafts 4a and 4b so as to closely overlap with each other.

In this example, in particular, as shown in FIG. 2, the take-up shafts 4a and 4b are configured to support the first and second screens 5a and 5b from the outdoor side thereof, respectively.

In the winding shafts 4a and 4b, a spring motor 41 for reducing the operating force at the time of winding the first and second screens 5a and 5b, respectively, and a predetermined braking force to the rotation torque of the winding shafts 4a and 4b are provided. The brake unit 42 to be applied is accommodated.

The weight bar 7 is mainly composed of a bottom frame 7a and a bottom pipe 7b that extend substantially parallel to the winding shafts 4a and 4b, and the left and right ends of the bottom frame 7a and the bottom pipe 7b are predetermined in the vertical direction on the side cap 7c. It is supported with a space between.

Then, the lower end of the first screen 5a is attached to the bottom frame 7a forming a part of the weight bar 7, and the lower end of the second screen 5b forms a pre-holdable bottom forming a part of the weight bar 7. It is attached to the pipe 7b. In this example, the bottom pipe 7b is vertically adjacent to the bottom frame 7a.

The bottom frame 7a is fixed to the left and right side caps 7c so as not to rotate relative to each other.

On the other hand, the bottom pipe 7b is supported rotatably relative to the left and right side caps 7c. A spring motor 71 is housed inside the bottom pipe 7b, and this spring motor 71 always keeps the lower end of the second screen 5b so that the second screen 5b hanging from the winding shaft 4b is not bent. The part is preliminarily held (preliminary winding in this example). Therefore, from the viewpoint of the weight bar 7, the bottom pipe 7b is configured as a rotating member that preliminarily holds the lower end of the second screen 5b so that it can be taken in and out.

In the first and second screens 5a and 5b, a light-transmitting portion 8 that transmits light and a light-shielding portion 9 that shields light are formed in a vertical stripe pattern at equal intervals. Then, in a state where the translucent portions 8 of the first and second screens 5a and 5b overlap, external light can be taken in from the translucent portions 8 and the translucent portions 8 of the first and second screens 5a and 5b. External light can be blocked in a state where the light blocking portions 9 overlap each other.

The light-transmitting portion 8 provided on the first and second screens 5a and 5b can be configured to have high air permeability, and the light shielding portion 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 are rotated in the same direction at the same speed, and the first and second screens 5a and 5b can be collectively lifted and lowered.

Further, 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, only the lower winding shaft 4b is rotated only by a predetermined angle, and the first and second screens 5a and 5a. , 5b can be moved relative to each other in the vertical direction.

The ball chain 11 is connected by a connector 12 and is formed into an endless shape, and also has restricting members 13a and 13b for restricting an ascending/descending range of the first and second screens 5a and 5b.

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

The connector 12 includes a ball locking portion that locks the ball of the ball chain 11 and a connecting portion that connects the ball locking portion. When the connector 12 is pulled with a force equal to or more than a preset pulling force, the ball engaging The stop is designed to come off the connection.

Next, a specific configuration of the operating device 10 will be shown. As shown in FIG. 1, a pulley 15 is rotatably supported in a case 14 of an operating device 10, and a ball chain 11 is mounted on the pulley 15. The pulley 15 is rotated in the forward and reverse directions by operating the ball chain 11.

The operating device 10 has a function of adjusting the degree of overlap between the light-transmitting portion 8 and the light-shielding portion 9 when the first and second screens 5a and 5b are moved up and down by the structure shown in FIG. There is.

As shown in FIG. 3A, a drive gear 16 is formed integrally with the pulley 15, and a transmission gear 17 meshing with the drive gear 16 is rotatably supported by the case 14.

A driven gear 31 meshing with the transmission gear 17 is rotatably supported by the case 14 above the case 14. The driving gear 16 and the driven gear 31 have the same number of teeth, and the driven gear 31 is rotated in the same direction as the driving gear 16 at the same speed based on the rotation of the driving gear 16.

A rotational force is applied to the driven gear 31 rotatably supported in the case 14 from the drive gear 16 rotated based on the operation of the ball chain 11 via the transmission gear 17, and the drive gear 16 and the driven gear 31 are rotated. Are rotated in the same direction at the same speed.

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 the non-rotatable relative. The center axis of the driven gear 31 is coaxial with the center axis of the winding shaft 4a, and the driven gear 31 is composed of a gear portion 32 and a transmission shaft portion 33, as shown in FIG. 3(b). The gear portion 32 is rotatably supported by the transmission shaft portion 33. The engaging hole 34 formed in the central portion of the transmission shaft portion 33 engages with the right end portion of the winding shaft 4a so that the transmission shaft portion 33 and the winding shaft 4a rotate integrally. There is.

A transmission piece 35 that projects in a fan shape in the radial direction is formed in the gear portion 32, and a transmission piece 36 that projects in a fan shape in the radial direction is provided on the transmission shaft portion 33 on the rotation locus of the transmission piece 35. The transmission pieces 35 and 36 are each formed within a range of 60 degrees with respect to the center. Therefore, the gear portion 32 can idle around the transmission shaft portion 33 within a range of 240 degrees at the maximum. This angle is an angle determined by the vertical width of the transparent portion 8 and the diameters of the winding shafts 4a and 4b.

A screw hole 37 is formed at one end of the gear portion 32, and a screw shaft 38 is screwed into the screw hole 37. A hexagonal hole 39 is formed at the tip of the screw shaft 38 so that a hexagonal wrench can be fitted therein. By rotating the screw shaft 38 with a hexagon wrench, the protruding length of the screw shaft 38 from the screw hole 37 can be adjusted.

The tip of the screw shaft 38 contacts the transmission piece 36 based on the rotation of the gear portion 32. Therefore, by adjusting the protruding length of the screw shaft 38, it is possible to adjust the idling angle until the transmission piece 35 of the gear portion 32 contacts the transmission piece 36 of the transmission shaft portion 33.

As shown in FIG. 3A, a visual hole 40 for confirming the rotational position of the transmission piece 35 of the gear 32 from the outside is formed on the outer surface of the case 14. Further, an operation hole 41 into which a hexagon wrench can be inserted is formed on the rear side surface of the case 14, and when the transmission piece 35 reaches a position where it can be seen through the visual hole 40, the hexagon wrench inserted through the operation hole 41 is inserted into the hexagonal hole 39. Can be easily fitted to the driven gear 31, which makes it possible to adjust the protruding length of the screw shaft 38 from the screw hole 37 and rotates via the transmission gear 17 with respect to the rotation of the drive gear 16. The idle angle can be easily adjusted.

Therefore, when the take-up shaft 4b is rotated based on the rotation of the drive gear 16 and the driven gear 31 is rotated with the idle angle through the transmission gear 17 based on the rotation of the drive gear 16, the take-up shaft 4b is rotated. 4a rotates at the same speed in the same direction.

That is, as shown in FIG. 2, when the drive gear 16 that rotates the winding shaft 4 b rotates in the direction of arrow A, the rotation of the driven gear 31 is within the angular range until the transmission piece 36 contacts the transmission piece 35. When the transmission piece 36 contacts the transmission piece 35 without being transmitted to the winding shaft 4a, the winding shaft 4a is transmitted so as to rotate in the arrow A direction.

Similarly, as shown in FIG. 2, when the drive gear 16 that rotates the winding shaft 4b rotates in the direction of the arrow B, the rotation of the driven gear 31 within the angular range until the transmission piece 36 contacts the transmission piece 35. Is not transmitted to the winding shaft 4a, and when the transmission piece 36 contacts the transmission piece 35, the winding shaft 4a is transmitted to rotate in the arrow B direction.

With such an operation, when the screens 5a and 5b are collectively lifted and lowered, and then the ball chain 11 is operated in the reverse direction to rotate the drive gear 16 in the reverse direction, the driven gear 31 moves approximately 240 degrees. The winding shaft 4a does not rotate until it rotates, and only the winding shaft 4b rotates.

Here, when the weight bar 7 is lowered to the lower limit position, the first and second screens 5a and 5b are configured so that an extra winding of a predetermined rotation (for example, one rotation) remains with respect to the winding shafts 4a and 4b. It is attached. In this way, the take-up shafts 4a and 4b can wind or rewind by rotating the upper ends of the first screen 5a and the second screen 5b of the front and rear double screens so as to have a predetermined relative movement range. Is configured to.

The configuration of the operating device 10 described above is merely an example, and may be the same as the configuration of the various operating devices 10 disclosed in Patent Document 2, for example.

(Example of weight bar)
Next, a specific configuration of the weight bar 7 according to the embodiment of the present invention will be described. As shown in FIG. 1, the weight bar 7 is mainly configured by a bottom frame 7a and a bottom pipe 7b that extend substantially parallel to the winding shafts 4a and 4b, and the left and right ends of the bottom frame 7a and the bottom pipe 7b are side walls, respectively. The cap 7c is supported at a predetermined interval in the vertical direction.

More specifically, as shown in FIGS. 4A and 4B, in the weight bar 7 of this embodiment, the lower end portion of the first screen 5a is attached to the bottom frame 7a forming a part of the weight bar 7. The lower end of the second screen 5b is attached to a pre-holdable bottom pipe 7b forming a part of the weight bar 7. Therefore, from the viewpoint of the weight bar 7, the bottom pipe 7b is configured as a rotating member that preliminarily holds the lower end of the second screen 5b so that it can be taken in and out.

The bottom frame 7a is formed in a pipe shape in this example, and is fixed to the left and right side caps 7c such that it cannot rotate relative to the side caps 7c. Particularly, from the viewpoint of design, the lower end of the second screen 5b is wound around and fixed to the bottom frame 7a so that the surface of the bottom frame 7a is not exposed.

On the other hand, the bottom pipe 7b is also similarly configured in a pipe shape, but has a cross-sectional diameter larger than that of the pipe-shaped bottom frame 7a of this example, and is relatively rotatable with respect to the left and right side caps 7c. Supported by. The bottom pipe 7b has a cross-sectional diameter sufficient to at least preliminarily hold one pitch of the light-transmitting portion 8 and the light-shielding portion 9 of the second screen 5b.

A spring motor 71 is housed inside the bottom pipe 7b, and this spring motor 71 always keeps the lower end of the second screen 5b so that the second screen 5b hanging from the winding shaft 4b is not bent. A biasing force (a broken line arrow shown in FIG. 4B) for preliminarily holding the portion is working.

That is, as described above, when the drive gear 16 for rotating the winding shaft 4b shown in FIG. 2 rotates in the direction of arrow A, in the angular range until the transmission piece 36 of the driven gear 31 comes into contact with the transmission piece 35, Since the rotation of the driven gear 31 is not transmitted to the winding shaft 4a, only the winding shaft 4b rotates and the winding shaft 4a does not rotate.

At this time, in the weight bar 7, as shown in FIG. 4B, the first screen 5a hanging from the winding shaft 4a does not move, and the second screen 5b hanging from the winding shaft 4b does not move. It moves upward as shown in (b). Then, the bottom pipe 7b rotates in the A direction against the biasing force of the spring motor 71, and the lower end portion of the second screen 5b preliminarily held by the bottom pipe 7b is pulled out from the weight bar 7 (by the bottom pipe 7b. The lower end of the second screen 5b that is pre-wound is unwound. This makes it possible to adjust the degree of overlap between the light-transmitting portion 8 and the light-shielding portion 9 on the first and second screens 5a and 5b, and to adjust the amount of light collected.

Further, since the first and second screens 5a and 5b are stretched by the weight of the weight bar 7, the second screen 5b does not bend when the second screen 5b moves upward.

After moving the second screen 5b in the upward direction, when the drive gear 16 for rotating the winding shaft 4b shown in FIG. 1 again rotates in the direction of the arrow B, the angle at which the transmission piece 36 contacts the transmission piece 35. In the range, since the rotation of the driven gear 31 is not transmitted to the winding shaft 4a, only the winding shaft 4b rotates and the winding shaft 4a does not rotate.

At this time, in the weight bar 7, as shown in FIG. 4B, the first screen 5a hanging from the winding shaft 4a does not move, and the second screen 5b hanging from the winding shaft 4b does not move. It moves downward as shown in (b). Then, the bottom pipe 7b is rotated in the B direction by the urging force of the spring motor 71, and the lower end portion of the second screen 5b is drawn into the weight bar 7 so as to be preliminarily held by the bottom pipe 7b (preliminarily wound by the bottom pipe 7b. The lower end of the second screen 5b is wound up). As a result, the degree of overlap between the light-transmitting portion 8 and the light-shielding portion 9 on the first and second screens 5a and 5b can be adjusted again, and the amount of light collected can be adjusted.

The first and second screens 5a and 5b are stretched by the weight of the weight bar 7 and are preliminarily held by the bottom pipe 7b by the urging force of the spring motor 71. Even in the downward movement of 5b, the second screen 5b does not bend.

Further, even if the operation of adjusting the amount of light collection within the angular range until the transmission piece 36 of the driven gear 31 comes into contact with the transmission piece 35 is repeated, the relative movement amount of the second screen 5b with respect to the first screen 5a is Since it is possible to adjust the preliminary holding amount (preliminary winding amount in this example) in the bottom pipe 7b, it is possible to perform the operation of adjusting the light amount without vertically moving the weight bar 7.

For example, at the relative angular position between the transmission piece 36 and the transmission piece 35 in the driven gear 31 shown in FIG. 5A, the weight bar 7 at the height h shown in FIG. It is assumed that the light-transmitting portion 8 and the light-shielding portion 9 of the first and second screens 5a and 5b are overlapped in the front-rear direction. In this state, as shown in FIG. 5C, the gear portion 32 is rotated around the transmission shaft portion 33 in the range of about 240 degrees, and the transmission piece 36 of the driven gear 31 is moved to the other end portion of the transmission piece 35. By rotating the weight bar 7 relative to each other at the height h without moving the weight bar 7 up and down, as shown in FIG. 5D, the light-transmitting portions of the first and second screens 5a and 5b are transmitted. 8 and the light shielding portion 9 can be made substantially parallel to each other in the front-rear direction.

In this way, by configuring the first screen 5a and the second screen 5b, which form the front and rear double screens, to have the light transmitting portion 8 and the light shielding portion 9, respectively, the light transmitting state of the front and rear double screens It is possible to switch between the light blocking state and As a result, the amount of light can be adjusted by the relative movement of the first and second screens 5a and 5b. Further, the light transmitting portion 8 can be configured to have high air permeability, and the light shielding portion 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.

The relative movement operation of the first and second screens 5a and 5b operates similarly regardless of whether or not the weight bar 7 is at the lower limit position. In particular, the relative movement range of the relative movement operation is set to be equal to or larger than the range that allows switching between the light-transmitting state and the light-shielding state in the front and rear double screens. Therefore, it is possible to realize a roll screen having a dimming function with a high degree of freedom of setting or a ventilation adjusting function at an arbitrary position of the weight bar 7.

In particular, when the weight bar 7 is at the lower limit position, it is possible to prevent light leakage from below the weight bar 7 in a manner that allows the amount of light to be adjusted, and to prevent light leakage from below the weight bar 7 in a manner that allows the ventilation amount to be adjusted. The airtightness of can be increased.

Then, the ball chain 11 is operated to adjust the amount of light in the direction in which the transmission piece 36 and the transmission piece 35 in the driven gear 31 come into contact with each other, and then further rotate in the same direction, whereby the take-up shafts 4a, 4b. Rotate at the same speed, and the first and second screens 5a and 5b can be raised and lowered by winding or rewinding the first and second screens 5a and 5b.

Further, the take-up shafts 4a and 4b allow the upper ends of the first screen 5a and the second screen 5b in the front and rear double screens to be idled so as to have a predetermined relative movement range, and can be taken up or rewound. Then, the bottom pipe 7b is provided with a spring motor 71 capable of preliminarily holding a length corresponding to the relative movement range.

Therefore, the surplus amount adjusted by the relative movement of the first and second screens 5a and 5b is wound up by the bottom pipe 7b, which also contributes to downsizing of the weight bar 7.

(First modification of weight bar)
Next, a specific configuration of the weight bar 7 of the first modified example according to the present invention will be described with reference to FIGS. The same components as those of the weight bar 7 described above in FIG. 4 are designated by the same reference numerals. As shown in FIGS. 6A and 6B, also in the weight bar 7 of the present modification, the lower end portion of the first screen 5a is attached to the bottom frame 7a forming a part of the weight bar 7, The lower end of the 2 screen 5b is attached to a pre-holdable bottom pipe 7b forming a part of the weight bar 7. Therefore, from the viewpoint of the weight bar 7, the bottom pipe 7b is configured as a rotating member that preliminarily holds the lower end portion of the second screen 5b so that it can be taken in and out.

However, in the weight bar 7 of the present modification, the bottom frame 7a has a shape in which the bottom pipe 7b extending substantially parallel to the winding shafts 4a and 4b is accommodated so as to be relatively rotatable, and the bottom frame 7a and the bottom pipe 7b are accommodated. The left and right ends are respectively supported by the side caps 7c.

More specifically, as shown in FIGS. 6(a) and 6(b), the bottom frame 7a is configured as a bottom cover that is open at the top and accommodates the bottom pipe 7b, and is rotated relative to the left and right side caps 7c. It is fixed to be impossible. Then, as shown in FIG. 6B, the lower end portion of the first screen 5a is attached to the mounting portion 72 of the bottom frame 7a (in this example, the inner wall of the bottom frame 7a) using a surface fastener or the like. It is fixed.

On the other hand, the bottom pipe 7b is configured as a pipe-shaped weight member as in the embodiment described above with reference to FIG. 4, and is supported so as to be rotatable relative to the left and right side caps 7c. The bottom pipe 7b has a cross-sectional diameter sufficient to at least preliminarily hold one pitch of the light-transmitting portion 8 and the light-shielding portion 9 of the second screen 5b.

A spring motor 71 is housed inside the bottom pipe 7b in the same manner as in the embodiment described above with reference to FIG. 4, so that the spring motor 71 is prevented from bending in the second screen 5b hanging from the winding shaft 4b. Due to 71, the biasing force (broken line arrow shown in FIG. 6B) for preliminarily holding the lower end portion of the second screen 5b is always exerted.

Then, the first and second screens 5a and 5b are guided upward through an opening above a bottom frame 7a configured as a bottom cover.

The weight bar 7 of the modified example shown in FIG. 6 configured as described above includes all the advantages of the weight bar 7 of the embodiment described above with reference to FIG.

That is, as described above, when the drive gear 16 for rotating the winding shaft 4b shown in FIG. 2 rotates in the direction of arrow A, in the angular range until the transmission piece 36 of the driven gear 31 comes into contact with the transmission piece 35, Since the rotation of the driven gear 31 is not transmitted to the winding shaft 4a, only the winding shaft 4b rotates and the winding shaft 4a does not rotate.

At this time, in the weight bar 7, as shown in FIG. 6B, the first screen 5a hanging from the winding shaft 4a does not move, and the second screen 5b hanging from the winding shaft 4b does not move. It moves upward as shown in (b). Then, the bottom pipe 7b rotates in the A direction against the biasing force of the spring motor 71, and the lower end of the second screen 5b preliminarily held by the bottom pipe 7b is rewound. This makes it possible to adjust the degree of overlap between the light-transmitting portion 8 and the light-shielding portion 9 on the first and second screens 5a and 5b, and to adjust the amount of light collected.

In addition, the first and second screens 5a and 5b are stretched by the weight of the weight bar 7, and the bottom pipe 7b is preliminarily wound by the biasing force of the spring motor 71. When the second screen 5b rotates in the B direction and moves downward, the amount of light can be similarly adjusted. Therefore, the second screen 5b does not bend even when the second screen 5b is moved in either the up or down direction.

Further, even if such an operation of adjusting the amount of light is repeated, the relative movement amount of the second screen 5b with respect to the first screen 5a can be adjusted by the preliminary holding amount (the preliminary winding amount in this example) in the bottom pipe 7b. Therefore, the operation of adjusting the amount of light can be performed without moving the weight bar 7 up and down.

The relative movement operation of the first and second screens 5a and 5b operates similarly regardless of whether or not the weight bar 7 is at the lower limit position. Therefore, the dimming function at an arbitrary position of the weight bar 7, or A roll screen with a ventilation adjustment function can be realized.

In particular, when the weight bar 7 is at the lower limit position, it is possible to prevent light leakage from below the weight bar 7 in a manner that allows the amount of light to be adjusted, and to prevent light leakage from below the weight bar 7 in a manner that allows the ventilation amount to be adjusted. The airtightness of can be increased.

Further, since the surplus amount adjusted by the relative movement of the first and second screens 5a and 5b is wound up by the bottom pipe 7b, it contributes to downsizing of the weight bar 7.

In addition, the weight bar 7 of the first modification shown in FIG. 6 has the following advantages.

First, since the bottom frame 7a is configured as a bottom cover for the bottom pipe 7b, the weight bar 7 can be further reduced in size to further contribute.

Further, since the first and second screens 5a and 5b are guided upward through the upper opening of the bottom frame 7a which is configured as a bottom cover, the width of the opening in the front-rear direction can be reduced. , A state in which the front and rear double first and second screens 5a and 5b can be brought closer or closer to each other, and the light transmitting portion 8 and the light shielding portion 9 of the first and second screens 5a and 5b overlap in the front and rear direction. In that case, the light shielding performance can be further enhanced.

(Second modification of weight bar)
Next, a specific configuration of the weight bar 7 of the second modified example according to the present invention will be described with reference to FIGS. The same components as those of the weight bar 7 described above in FIG. 4 are designated by the same reference numerals. As shown in FIGS. 7A and 7B, in the weight bar 7 of this modification, the lower end portion of the first screen 5a is attached to the bottom frame 7a forming a part of the weight bar 7. The lower end of the second screen 5b is attached to a plate-like bottom bar 7d that constitutes a part of the weight bar 7 and can be preliminarily held. Therefore, from the viewpoint of the weight bar 7, the bottom bar 7d is configured as a rotating member that preliminarily holds the lower end of the second screen 5b so that it can be taken in and out.

More specifically, as shown in FIGS. 7(a) and 7(b), the bottom frame 7a is configured as a bottom cover that is open at the top and accommodates the bottom bar 7d, and is not rotatable relative to the left and right side caps 7c. It is fixed to. Then, as shown in FIG. 7B, the lower end portion of the first screen 5a is attached to the mounting portion 72 of the bottom frame 7a (in this example, the inner wall of the bottom frame 7a) using a surface fastener or the like. It is fixed.

On the other hand, the bottom bar 7d is configured as a plate-shaped weight member, one side of which is supported rotatably relative to the side caps 7c on the left and right sides, and the other side of which is attached to the lower end of the second screen 5b. The rotation range of the bottom bar 7d is set to a diameter sufficient to preliminarily wind one pitch of the light transmitting portion 8 and the light shielding portion 9 of the second screen 5b. In particular, in the weight bar 7 of this modification, the guide member 7e is provided in the longitudinal direction thereof. The guide member 7e is formed in a curved plate shape so that the lower end of the second screen 5b is preliminarily held in a circular shape, and is supported by the side caps 7c on both left and right sides. The shape of the guide member 7e is not limited to the illustrated example, but it is necessary to preliminarily hold the lower end portion of the second screen 5b by providing the curved bar-shaped guide member 7e on the weight bar 7. It is possible to earn a great travel distance.

A spring 71a, instead of the spring motor 71, is housed on one side (or both sides) of the bottom bar 7d in the same manner as in the embodiment described above with reference to FIG. 4, and on the second screen 5b hanging from the winding shaft 4b. The mainspring 71a constantly applies a biasing force (a broken line arrow shown in FIG. 7B) for preliminarily holding the lower end portion of the second screen 5b so as to prevent the bending. However, in this example, the mainspring 71a is used for the purpose of downsizing, but a spring motor may be arranged so as to bias the rotating shaft of the bottom bar 7d.

Then, the first and second screens 5a and 5b are guided upward through an opening above a bottom frame 7a configured as a bottom cover.

The weight bar 7 of the modified example shown in FIG. 7 configured as described above includes all the advantages of the weight bar 7 of the embodiment described above with reference to FIG.

That is, as described above, when the drive gear 16 for rotating the winding shaft 4b shown in FIG. 2 rotates in the direction of arrow A, in the angular range until the transmission piece 36 of the driven gear 31 comes into contact with the transmission piece 35, Since the rotation of the driven gear 31 is not transmitted to the winding shaft 4a, only the winding shaft 4b rotates and the winding shaft 4a does not rotate.

At this time, in the weight bar 7, as shown in FIG. 7B, the first screen 5a hanging from the winding shaft 4a does not move, and the second screen 5b hanging from the winding shaft 4b does not move. It moves upward as shown in (b). Then, the bottom bar 7d rotates in the A direction against the biasing force of the mainspring 71a, and the lower end portion of the second screen 5b preliminarily held by the bottom bar 7d is discharged. This makes it possible to adjust the degree of overlap between the light-transmitting portion 8 and the light-shielding portion 9 on the first and second screens 5a and 5b, and to adjust the amount of light collected.

Further, the first and second screens 5a and 5b are stretched by the weight of the weight bar 7 and are preliminarily held by the bottom bar 7d by the urging force of the mainspring 71a. Therefore, the bottom bar 7d moves in the B direction. When the second screen 5b rotates and moves downward, the amount of light can be adjusted in the same manner. Therefore, the second screen 5b does not bend even when the second screen 5b is moved in either the up or down direction.

Further, even if such an operation of adjusting the amount of light is repeated, the relative movement amount of the second screen 5b with respect to the first screen 5a can be adjusted by the preliminary holding amount of the bottom bar 7d. It is possible to perform the operation of adjusting the amount of light without moving up and down.

The relative movement operation of the first and second screens 5a and 5b operates similarly regardless of whether or not the weight bar 7 is at the lower limit position. Therefore, the dimming function at an arbitrary position of the weight bar 7, or A roll screen with a ventilation adjustment function can be realized.

The weight bar 7 of the second modification shown in FIG. 7 includes all the advantages of the weight bar 7 of the first modification shown in FIG.

[Second Embodiment]
Next, with reference to FIG. 8, a roll screen of the second embodiment will be described. The same components as those of the roll screen of the first embodiment described above are designated by the same reference numerals. When the light-transmitting portion 8 and the light-shielding portion 9 of the first and second screens 5a and 5b are overlapped in the front-rear direction, the front-rear double first and second screens 5a An air layer is positively provided between the 5b so that the heat insulating function is exerted. However, it is desirable that both the light-transmitting portion 8 and the light-shielding portion 9 have low air permeability in order to exert a heat insulating effect.

That is, as shown in FIG. 8A, in the present embodiment, the winding shaft 4a supports the first screen 5a from the outside thereof, and the winding shaft 4b supports the second screen 5b from the inside thereof. With the configuration, the first and second screens 5a and 5b are each hung substantially vertically.

However, in this embodiment, the winding shafts 4a and 4b are configured to be rotatable in opposite directions at the same speed. Therefore, for example, as shown in FIG. 8B, two transmission gears 17 are provided between the drive gear 16 and the driven gear 31 in the case 14 of the operating device 10. The two transmission gears 17 have the same number of teeth, and the drive gear 16 and the driven gear 31 have the same number of teeth as shown in FIG.

The structures of the driving gear 16 and the driven gear 31 are the same as those shown in FIG. 3, respectively. The center axis of the driving gear 16 is coaxial with the center axis of the winding shaft 4b, and the driving gear 16 is wound. It is located on the right end side of the shaft 4b and engaged with it so that it cannot rotate relative to it. Further, the center axis of the driven gear 31 is coaxial with the center axis of the winding shaft 4a, and the driven gear 31 is composed of a gear portion 32 and a transmission shaft portion 33, as in the case shown in FIG. 3(b). The gear portion 32 is rotatably supported by the transmission shaft portion 33. The engaging hole 34 formed in the central portion of the transmission shaft portion 33 engages with the right end portion of the winding shaft 4a so that the transmission shaft portion 33 and the winding shaft 4a rotate integrally. There is.

Therefore, in the present embodiment, the take-up shaft 4b is rotated based on the rotation of the drive gear 16, and based on the rotation of the drive gear 16, the driven gear having a predetermined idling angle via the two transmission gears 17. When 31 rotates, the winding shaft 4a rotates at the same speed in the opposite direction.

On the other hand, the weight bar 7 has, for example, a box-like shape that accommodates a bottom pipe 7b that extends substantially parallel to the winding shafts 4a and 4b with respect to the bottom frame 7a so as to be relatively rotatable. Both ends are respectively supported by the side caps 7c.

More specifically, as shown in FIG. 8A, the bottom frame 7a is configured as, for example, a box-shaped bottom cover that accommodates a bottom pipe 7b that opens upward, and rotates relative to the left and right side caps 7c. It is fixed to be impossible. The lower end of the first screen 5a is attached and fixed to the mounting portion 72 of the bottom frame 7a (inner wall of the bottom frame 7a in this example) using a surface fastener or the like.

On the other hand, the bottom pipe 7b is formed in a pipe shape as in the embodiment described above with reference to FIG. 4, and is supported so as to be rotatable relative to the side caps 7c on the left and right sides. In addition, the cross-sectional diameter of the bottom pipe 7b is set to a diameter sufficient to at least preliminarily hold one pitch of the light transmitting portion 8 and the light shielding portion 9 of the second screen 5b, as in the example of the first embodiment.

A spring motor 71 is housed inside the bottom pipe 7b as in the example of the first embodiment described above with reference to FIG. 4, so that the second screen 5b hanging from the winding shaft 4b is not bent. The spring motor 71 constantly exerts a biasing force for preliminarily holding the lower end of the second screen 5b.

Then, the first and second screens 5a and 5b are guided upward through an opening above a bottom frame 7a configured as a box-shaped bottom cover, for example.

In the embodiment illustrated in FIG. 8, in order to improve the understanding of the basic structure thereof, the first and second screens 5a and 5b are respectively suspended by the winding shafts 4a and 4b in a substantially vertical direction, and the weight bar Regarding the bottom frame 7a in No. 7, an example is described in which it is configured as a box-shaped bottom cover having an opening at the top.

However, in practice, a member having an opening is provided below the support bracket 3 in order to bring the front and rear double first and second screens 5a and 5b closer to each other below the winding shaft 4b. It is configured to guide the hanging of the front and rear double first and second screens 5a and 5b. Further, the structure of the weight bar 7 is configured as shown in FIG. 6 or 7, and the weight bar 7 is upwardly moved through an opening portion above the bottom frame 7a which constitutes the first and second screens 5a and 5b as a bottom cover. It is preferable to be configured to guide.

Therefore, when the air layer is positively provided between the front and rear double first and second screens 5a and 5b, the distance between the first and second screens 5a and 5b can be arbitrarily set.

In the weight bar 7 in the embodiment shown in FIG. 8, when the light-transmitting portion 8 and the light-shielding portion 9 in the first and second screens 5a and 5b overlap each other in the front-rear direction, the front-rear double first and Since the air layer is positively provided between the second screens 5a and 5b, the heat insulating function is exerted rather than the light shielding performance thereof is improved. However, other aspects are exemplified in the above-described first embodiment. The advantages of the weight bar 7 are included.

That is, as described above, when the drive gear 16 for rotating the winding shaft 4b shown in FIG. 8 rotates in the direction of the arrow A, the transmission piece 36 in the driven gear 31 is transmitted as described above with reference to FIG. In the angular range until it comes into contact with 35, since the rotation of the driven gear 31 is not transmitted to the winding shaft 4a, only the winding shaft 4b rotates and the winding shaft 4a does not rotate. When the drive gear 16 for rotating the winding shaft 4b rotates in the arrow A direction and the transmission piece 36 contacts the transmission piece 35, the winding shaft 4a is transmitted so as to rotate in the arrow A direction.

Similarly, when the drive gear 16 for rotating the winding shaft 4b shown in FIG. 1 rotates in the direction of the arrow B, the transmission piece 36 of the driven gear 31 comes into contact with the transmission piece 35 as described above with reference to FIG. In the angular range up to, since the rotation of the driven gear 31 is not transmitted to the winding shaft 4a, only the winding shaft 4b rotates and the winding shaft 4a does not rotate. The drive gear 16 that rotates the winding shaft 4b rotates in the direction of arrow B, and when the transmission piece 36 contacts the transmission piece 35, the winding shaft 4a is transmitted so as to rotate in the direction of arrow B.

Therefore, it is possible to adjust the degree of overlap between the light-transmitting portion 8 and the light-shielding portion 9 on the first and second screens 5a and 5b, and it is possible to adjust the amount of light collected.

The first and second screens 5a and 5b are stretched by the weight of the weight bar 7 and preliminarily held by the bottom pipe 7b by the biasing force of the spring motor 71. The second screen 5b does not bend when it is moved in either the up or down direction.

Further, even if the operation of adjusting the amount of light collection within the angular range until the transmission piece 36 of the driven gear 31 comes into contact with the transmission piece 35 is repeated, the relative movement amount of the second screen 5b with respect to the first screen 5a is Since it is possible to adjust by the preliminary holding amount in the bottom pipe 7b, it is possible to perform the adjusting operation of the light amount without moving the weight bar 7 up and down.

Since the relative movement operation of the first and second screens 5a and 5b operates similarly regardless of whether the weight bar 7 is at the lower limit position, it has a dimming function at an arbitrary position of the weight bar 7. It is possible to realize a rolled screen.

In particular, when the weight bar 7 is at the lower limit position, it is possible to prevent light leakage from below the weight bar 7 in a manner in which the amount of light collected can be adjusted.

Further, since the surplus amount adjusted by the relative movement of the first and second screens 5a and 5b is wound up by the bottom pipe 7b, it contributes to downsizing of the weight bar 7.

In addition, in the weight bar 7 of the present embodiment illustrated in FIG. 8, since the air layer is positively provided between the first and second screens 5a and 5b, a roll screen that exerts a heat insulating function is configured. can do.

(Modifications of the winding shafts 4a and 4b)
Next, a modified example of the winding shafts 4a and 4b will be described with reference to FIG. In the roll screens of the above-described first and second embodiments, the two first and second screens 5a and 5b are overlapped with each other, and the upper ends of the respective first and second screens 5a and 5b are provided above and below, respectively. The example has been described in which the first and second screens 5a and 5b can be moved up and down by winding or rewinding with the winding shafts 4a and 4b. Accordingly, the relative movement of the first and second screens 5a and 5b is the same regardless of whether or not the weight bar 7 is at the lower limit position, so that the weight bar 7 has a dimming function at an arbitrary position. It is possible to realize a rolled screen.

On the other hand, from a practical point of view, when it is only necessary to provide the dimming function when the weight bar 7 is at the lower limit position, the take-up shafts 4a and 4b having the double structure as shown in FIG. Can be That is, the two first and second screens 5a and 5b are superposed on each other by the winding shafts 4a and 4b having the double structure, and the upper ends of the respective first and second screens 5a and 5b are wound or wound. By returning it, the first and second screens 5a and 5b can be configured to be movable up and down.

More specifically, as shown in FIG. 9A, the take-up shaft 4a has a double structure in which the take-up shaft 4a and the take-up shaft 4b house the take-up shaft 4b with the rotation center axes of the take-up shafts 4a and 4b on the same axis. The winding shaft 4a is provided with an opening 47 extending in the axial direction, and a space 48 is provided on the outer surface of the winding shaft 4b and the inner surface of the winding shaft 4a. The space portion 48 is an area sufficient to preliminarily hold at least one pitch of the light transmitting portion 8 and the light shielding portion 9 of the second screen 5b by the winding shaft 4b.

Further, a transmission piece 45 is formed at one end of the take-up shaft 4a so as to project in a fan shape in the radial direction, and a transmission piece 46 is formed at the end of the take-up shaft 4b in the same direction so as to project in a fan shape in the radial direction. It is provided on the locus of rotation of 45.

Although not shown, the other end of the winding shaft 4a is provided with a friction material that generates a constant braking force within a range that does not hinder the dimming operation as a relative rotation with respect to the winding shaft 4a. Inside the take-up shaft 4b, although not shown, a spring motor for reducing the operating force at the time of hoisting the first and second screens 5a, 5b, and a predetermined braking force for the rotation torque of each take-up shaft 4a, 4b. A brake unit or the like for applying the is stored.

The transmission pieces 45 and 46 in this example are each formed within a range of 60 degrees with respect to the center. Therefore, the winding shaft 4b is allowed to idle around the winding shaft 4a within a maximum range of 240 degrees. This angle is an angle determined by the vertical width of the transparent portion 8 and the diameters of the winding shafts 4a and 4b.

Thus, the pulley that is rotated based on the operation of the ball chain is integrally and rotatably attached to the winding shaft 4b, so that the winding shaft 4b can be rotated. When the winding shaft 4b rotates, the winding shaft 4a has a predetermined idling angle and rotates in the same direction at the same speed.

In particular, in the example shown in FIG. 9A, the winding shafts 4a and 4b themselves are configured to have an idle rotation mechanism that idles so as to have the relative movement range in the front and rear double screens. As a result, the light control operation (including the ventilation adjustment operation) and the raising/lowering operation of the first screen 5a and the second screen 5b can be collectively performed by the operation of the ball chain or the like. It also contributes to downsizing of the operating device for rotating the winding shafts 4a and 4b.

The operation of the winding shafts 4a and 4b having the double structure shown in FIG. 9A will be described. The structure of the weight bar 7 can be applied to any of the examples and modifications described in the first and second embodiments described above.

First, FIG. 9B schematically shows a cross-sectional view of the winding shafts 4a and 4b when the weight bar 7 is at the lower limit position.

As shown in FIG. 9B, the first screen 5a hangs from the winding shaft 4a, and the second screen 5b hangs from the winding shaft 4b through the opening 47 of the winding shaft 4a. When one end of the transmission piece 45 is in contact with one end of the transmission piece 46, the light-transmitting portion 8 and the light-shielding portion 9 in the first and second screens 5a and 5b are substantially parallel to each other in the front-rear direction. To do.

Subsequently, as shown in FIG. 9C, the winding shaft 4b is rotated based on the operation of the ball chain, and the winding shaft 4b is moved until the other end of the transmission piece 46 contacts the other end of the transmission piece 45. The winding shaft 4a is made to idle. In this state, the light-transmitting portion 8 and the light-shielding portion 9 of the first and second screens 5a and 5b overlap each other in the front-rear direction.

Further, as shown in FIG. 9D, the winding shaft 4b is further rotated in the same direction with the other end of the transmission piece 46 in contact with the other end of the transmission piece 45 based on the operation of the ball chain. By doing so, the first and second screens 5a and 5b are wound at the same time. Alternatively, with the one end of the transmission piece 45 in contact with the one end of the transmission piece 46, the winding shaft 4b is further rotated in the same direction, whereby the first and second screens 5a and 5b are simultaneously rewound.

Accordingly, when the weight bar 7 is at the lower limit position, by configuring the roll screen to which the weight bar 7 in each of the examples and the modifications described in the above-described first and second embodiments is applied, The first and second screens 5a and 5b can be moved up and down, and the operation of adjusting the amount of light can be performed without moving the weight bar 7 up and down. Can be realized.

(Modification of screen)
In the example of the above-described embodiment, the first and second screens 5a and 5b are provided with the light-transmitting portion 8 that transmits light and the light-shielding portion 9 that shields light formed in stripes in the vertical direction at equal intervals. Although an example has been described, it is not necessary to be limited to this.

For example, as a modified example of the first and second screens 5a and 5b in the roll screen shown in FIG. 1, as illustrated in FIG. 10A, the first and second screens 5a and 5b and the weight bar 7 have a lower limit. A roll screen that allows the amount of light to be adjusted when the first and second screens 5a and 5b are in the position and only the predetermined regions of the upper and lower ends are the light transmitting parts 8 and the other regions are the light shielding parts 9. can do.

Further, as illustrated in FIG. 10B, the light transmitting portion 8 and the light shielding portion 9 can be the first and second screens 5a and 5b in a checkered (or zigzag) shape.

Further, as illustrated in FIG. 10C, the light-transmitting portion 8 and the light-shielding portion 9 may be first and second screens 5a and 5b in which stripes are obliquely parallel to each other.

In summary, the roll screen according to the present invention can be wound or rewound by idling the upper ends of the first screen 5a and the second screen 5b in the front and rear double screens so as to have a predetermined relative movement range. The winding means (the winding shafts 4a and 4b and the operating device 10 in the example shown in FIGS. 2 and 8 and the winding shafts 4a and 4b themselves in the example shown in FIG. 9) for stretching and the front and rear double screens are stretched. And a weight bar 7 for The weight bar 7 is provided with a bottom frame 7a for fixing the lower end of the first screen 5a and a rotating member (bottom pipe 7b or bottom bar 7d) for preliminarily holding the lower end of the second screen 5b so that it can be taken in and out. Composed. Thereby, when the front and rear double screens are relatively moved, the vertical movement of the weight bar can be prevented.

Further, in the roll screen according to the present invention, the weight bar 7 can preliminarily hold the lower end portion of the second screen 5b with a length corresponding to the relative movement range with respect to the rotating member (bottom pipe 7b or bottom bar 7d). The spring motor 71, the mainspring 71a, and other urging means are provided. As a result, the surplus amount adjusted by the relative movement of the first and second screens 5a and 5b is preliminarily held by the rotating member, so that the first and second screens 5a and 5b do not bend, and yet. It also contributes to downsizing of the weight bar 7.

Further, in the roll screen according to the present invention, the rotary member (bottom pipe 7b or bottom bar 7d) is arranged adjacent to the bottom frame 7a, thereby contributing to downsizing. More preferably, the rotary member (bottom pipe 7b or bottom bar 7d) is configured to be housed in the bottom frame 7a, which contributes to further downsizing, and the first screen 5a and the first screen 5a which form a double screen. It is possible to bring the two screens 5b closer to each other and improve the performance of adjusting the amount of light.

In addition, in the roll screen according to the present invention, the first screen 5a and the second screen 5b, which form a double-sided screen, have a light-transmitting portion 8 and a light-shielding portion 9, respectively. It is configured to enable switching between a light-transmitting state and a light-blocking state in. As a result, the amount of light can be adjusted by the relative movement of the first and second screens 5a and 5b.

Further, in the roll screen according to the present invention, the relative movement range is set to be equal to or larger than the range that allows switching between the light-transmitting state and the light-shielding state in the front and rear double screens. This makes it possible to realize a roll screen having a dimming function (including a ventilation adjusting function) with a high degree of freedom in setting.

Further, in the roll screen according to the present invention, the winding shafts 4a and 4b are configured to suspend the first screen 5a and the second screen 5b, respectively, and the operating device 10 or the winding shafts 4a and 4b themselves are the front and rear. It is configured to have an idle rotation mechanism that idles the double screen so as to have the relative movement range. As a result, the light control operation (including the ventilation adjustment operation) and the raising/lowering operation of the first screen 5a and the second screen 5b can be collectively performed by the operation of the ball chain or the like.

Further, in the roll screen according to the present invention, the first screen 5a and the second screen 5b are staggered including a parallel pattern, a diagonal parallel pattern, or a checkered pattern in which the light transmitting portions 8 and the light shielding portions 9 are alternately repeated at the same pitch. A pattern, or a multi-region pattern having a plurality of regions in which one or both of a predetermined upper end region and a lower end region when the weight bar 7 is at the lower limit position can switch between a light-transmitting state and a light-shielding state. Configured to have. As a result, the roll screen can be configured to be dimmable with various fabric types.

Although the present invention has been described above with reference to the example of the specific embodiment, the present invention is not limited to the example of the above-described embodiment, and various modifications can be made without departing from the technical idea thereof. For example, in the example of the above-described embodiment, the operation by the ball chain is described as an example for the rotation operation of the winding shafts 4a and 4b, but the rotation operation may be performed by a cord-shaped operation code, or the winding shaft 4a. , 4b may be a roll screen for electrically rotating.

Further, in the example of the embodiment described above, the example in which the spring motor 71 is provided in the bottom pipe 7b of the weight bar 7 has been described, but a spring may be used instead of the spring motor 71, that is, the second motor. Any biasing means capable of preliminarily holding the lower end of the screen 5b may be used.

Further, in the example of the above-described embodiment, the specific example in which the bottom frame 7a of the weight bar 7 has a pipe shape or constitutes a bottom cover has been described, but the bottom frame 7a is the lower end of the first screen 5a. Any shape and structure can be adopted as long as the portion can be attached and fixed.

According to the present invention, it is possible to prevent the weight bar from moving up and down while suppressing an increase in the size of the weight bar when adjusting the amount of lighting by relative movement of the front and rear double screens, and further when switching the lifting operation. It is useful for roll screen applications with dual screens.

1 mounting bracket 2 frame 3 support brackets 4a, 4b winding shaft 5a first screen 5b second screen 7 weight bar (weight member)
7a Bottom frame 7b Bottom pipe 7c Side cap 7d Bottom bar 8 Light transmitting part 9 Light shielding part 10 Operating device 11 Ball chain 71 Spring motor 71a Mainspring

Claims (7)

It is a roll screen that hangs a double front and rear screen,
Winding means capable of idling and rewinding each upper end of the first screen and the second screen in the front and rear double screen so as to have a predetermined relative movement range,
A weight member for stretching the front and rear double screens,
The weight member is
A bottom frame for fixing the lower end of the first screen,
A rotating member for preliminarily holding the lower end of the second screen so that it can be taken out and put in;
A roll screen comprising: The weight member further comprises an urging means for urging the rotating member so as to preliminarily hold the lower end portion of the second screen with a length corresponding to the relative movement range. 1. The roll screen according to 1. The roll screen according to claim 1 or 2, wherein the rotating member is disposed adjacent to the bottom frame or is configured to be housed in the bottom frame. The first screen and the second screen each have a light-transmitting portion and a light-shielding portion, and are configured to enable switching between a light-transmitting state and a light-shielding state in the front and rear double screens. The roll screen according to any one of claims 1 to 3. 5. The predetermined relative movement range is set to be equal to or larger than a range that allows switching between a light-transmitting state and a light-shielding state in the front and rear double screens. Roll screen described in. The winding means includes two winding shafts respectively suspending the first screen and the second screen, and an idling mechanism for idling the front and rear double screens to have the relative movement range. The roll screen according to any one of claims 1 to 5. The first screen and the second screen are parallel patterns in which light-transmitting portions and light-shielding portions are alternately repeated at the same pitch, a staggered pattern including a checkerboard pattern, or when the weight member is at the lower limit position. 7. One or both of a predetermined upper end vicinity region and a lower end vicinity region have a multi-region pattern having a plurality of regions capable of switching between a light-transmitting state and a light-shielding state. The roll screen according to any one of items.