Upper daylighting roller shutter

Abstract

The utility model relates to an upper daylighting roller shutter which comprises a reel and curtain cloth connected with the reel, movable pulleys are arranged at the two ends of the reel, the upper daylighting roller shutter comprises traction ropes and tensioning wheel assemblies which are symmetrically arranged on the two sides, and the traction rope on each side is provided with a fixed first end and a fixed second end. The tensioning wheel assembly on each side comprises a first tensioning wheel and a second tensioning wheel, the pulling rope winds around the movable pulley from the lower portion of the first end to form an upward lifting section for pulling the pulley upwards, and the pulling rope winds around the movable pulley from the upper portion of the second end to form a downward pulling section for pulling the pulley downwards. The lifting and rotation of the movable pulley on one side of the roller shutter are reliably, simply and conveniently transmitted to the opposite side of the roller shutter by fixing the two ends of the traction rope and taking the reel as a transmission part. Therefore, the two sides of the rolling shaft are kept balanced and horizontally lifted while the rolling shaft rotates, and the upper lighting effect of the roller shutter is achieved. The integral structure of the lifting reel type roller shutter is greatly simplified, the mounting operation is very convenient, the operation is more reliable and smoother, and the product cost is obviously reduced.

Description

Technical Field

[0001] This application relates to the field of roller blind technology, and in particular to a top-lit roller blind. Background Technology

[0002] Roller blinds are convenient to use and aesthetically pleasing, making them widely used in homes and offices. The most common method for using roller blinds is to fix the roller to the top of the window; rotating the roller rolls up or down the curtain. These blinds open from the bottom of the window, allowing light to pass through while blocking light from the top. When open, the bottom of the window should not obstruct the view, and the top should not allow light in.

[0003] In real life, private spaces such as bedrooms, meeting rooms, and bathrooms, as well as school classrooms and some offices, often require the lower half of windows to block the view while utilizing the upper half for natural light. This necessitates a type of roller blind that allows light to pass through from above.

[0004] Chinese patent ZL201810513089.X discloses a roller blind that can open and close freely from top to bottom. This patent uses a tensioning wheel and a movable pulley system to allow the movable pulley on one side of the blind to rotate while rising and falling. Embodiments of this patent disclose a winding-driven operation mode and a drive-wheel-driven operation mode in a closed-loop state of the traction rope. The patent also discloses a technical solution where "the traction rope and traction device are symmetrically arranged, and the traction devices on both sides are coaxially connected." In actual blind installation, the symmetrical arrangement of the traction rope and traction device, and the coaxial connection of the traction devices on both sides, is crucial for ensuring synchronous operation on both sides of the roller blind and maintaining the horizontal balance of the roller shaft. However, this solution requires a transmission rod parallel to the roller shaft outside the roller shaft, making the overall blind system structure complex, difficult to install, and costly, thus preventing it from becoming a commercially viable product for a long time. Utility Model Content

[0005] Therefore, it is necessary to provide a top-lit roller blind to address the technical problem of how to easily and accurately transmit the lifting and rotation of the pulley on one side of the roller blind to the other side of the roller blind.

[0006] The overhead light-transmitting roller blind includes a roller and a curtain fabric connected to the roller. Two movable pulleys are provided at both ends of the roller. The overhead light-transmitting roller blind includes symmetrically arranged traction ropes and tension wheel assemblies on both sides. Each traction rope has a fixed first end and a fixed second end. Each tension wheel assembly includes a first tension wheel and a second tension wheel. The traction rope passes under the movable pulley from the first end to form an upward lifting section that pulls the movable pulley upwards. The traction rope passes over the movable pulley from the second end from above to form a downward pulling section that pulls the movable pulley downwards. The upward lifting section passes over the first tension wheel and connects with the downward pulling section that passes over the second tension wheel. The overhead light-transmitting roller blind includes a drive mechanism that drives one tension wheel on one side to rotate. When the drive mechanism is activated, it drives the movable pulley on one side to rise and fall while simultaneously rotating, which in turn drives the movable pulley on the other side to rise and fall while simultaneously rotating via the roller.

[0007] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0008] Optionally, the axes of the tensioning wheel and the movable pulley have an included angle of 70-110 degrees.

[0009] Optionally, the axes of the tensioning wheel and the movable pulley have an included angle of 90 degrees.

[0010] Optionally, the traction rope is a beaded chain, and the tensioning pulley and the movable pulley are sprockets that cooperate with the beaded chain.

[0011] Optionally, the drive mechanism is a motor.

[0012] Optionally, the drive mechanism is a manual sprocket, which is connected to the tension wheel via a connecting mechanism.

[0013] Optionally, the connecting mechanism is a planetary gear reduction mechanism or a spring anti-rotation mechanism.

[0014] Optionally, it includes two transparent panels, with the roller and the curtain disposed between the two transparent panels.

[0015] Optionally, it includes two guide rails, each guide rail having a lifting cavity that is clearance-fitted with the movable pulley and a driving cavity that is clearance-fitted with the tensioning wheel assembly. The lifting cavity has an opening slot that allows the connection between the movable pulley and the reel to pass through.

[0016] Optionally, the lower end of the curtain is provided with a lower rod, and an elastic connector or a sliding connector that slides with the guide rail is provided between the lower rod and the lower end of the guide rail.

[0017] Optionally, the lifting cavity and the driving cavity partially intersect and overlap in the longitudinal space; more preferably, they intersect and overlap perpendicularly.

[0018] The light-transmitting roller blinds in this application have at least the following technical effects:

[0019] When one of the tensioning pulleys in the tensioning pulley assembly on one side rotates under the action of the drive mechanism, the tensioning pulley drives the traction rope to rotate and simultaneously raise and lower the movable pulley on the same side, since both ends of the traction rope are fixed. Because the movable pulleys are coaxially and fixedly connected to both ends of the roller, they transmit their rotation to the roller and the movable pulley on the opposite side. Since the traction rope on the opposite side is also fixed at both ends, the movable pulley on the opposite side actively winds the traction rope due to its rotation, causing both movable pulleys to rise and fall synchronously, thus achieving horizontal balance in the raising, lowering, and rotating of the roller. When the roller rises and falls horizontally, its rotation causes the curtain to be rolled up and released, achieving the upward lighting effect of the roller blind.

[0020] The advantages of this invention are: by fixing both ends of the traction rope and using the roller itself as the transmission component, the transmission rod that connects the traction devices on both sides coaxially and is arranged parallel to the roller is omitted. This reliably and easily transmits the lifting and rotation of the pulley on one side of the roller blind to the opposite side. This allows the roller to lift and rotate in a balanced manner while simultaneously rotating, achieving the upward lighting effect of the roller blind. This invention greatly simplifies the overall structure of roller blinds with lifting rollers, making installation and operation very convenient, operation more reliable and smooth, and significantly reducing product costs. Attached Figure Description

[0021] Figure 1 This is a front view of a light-transmitting roller blind according to an embodiment of this application;

[0022] Figure 2 This is a side view of the traction rope, tension wheel, and movable pulley on one side of a light-transmitting roller blind according to an embodiment of this application;

[0023] Figure 3 This is a top view schematic diagram of the axially perpendicular arrangement of the tension wheel and the movable pulley in a light-transmitting roller blind according to an embodiment of this application;

[0024] Figure 4 This is a top view schematic diagram of the relative positions of the movable pulley, tensioning wheel, and manual sprocket in a light-transmitting roller blind according to an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the manual drive mechanism in a skylight roller blind according to an embodiment of this application;

[0026] Figure 6 This is a front view of a light-transmitting roller blind according to an embodiment of this application, comprising two layers of transparent panels;

[0027] Figure 7 A top view of a guide rail configured for a light-transmitting roller blind according to an embodiment of this application;

[0028] Figure 8 This is a side view of a light-transmitting roller blind with a guide rail according to an embodiment of this application, wherein an elastic connector is provided between the lower end of the curtain and the lower end of the guide rail;

[0029] Figure 9 This is a side view of a light-transmitting roller blind with a guide rail according to an embodiment of this application, wherein a sliding connector is provided between the lower end of the curtain and the guide rail;

[0030] The annotations in the figure are explained as follows:

[0031] 11. Movable pulley; 12. Movable pulley;

[0032] 21. Towing rope; 211. Lifting section; 212. Pulling section; 22. Towing rope; 23. Beaded chain;

[0033] 31. Tensioner; 32. Tensioner; 33. Tensioner; 34. Tensioner; 35. Manual sprocket; 36. Connecting mechanism;

[0034] 41. Fixed end; 42. Fixed end; 43. Fixed end; 44. Fixed end;

[0035] 5. Roller; 6. Curtain; 61. Lower rod; 7. Drive mechanism; 8. Transparent sheet;

[0036] 82. Guide rail; 821. Lifting chamber; 822. Drive chamber; 823. Opening slot; 9. Axial angle;

[0037] 101. Flexible connector; 102. Sliding connector. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] It should be noted that when a component is said to be "connected" to another component, it can be directly connected to the other component or it can be connected to a component in between. When a component is said to be "set on" another component, it can be directly set on the other component or it may be set to a component in between.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] In this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number or order of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a system, product, or device that includes a series of units is not necessarily limited to those units that are explicitly listed, but may include other units that are not explicitly listed or that are inherent to such products or devices.

[0043] In this application, the terms "corresponding," "matching," "adapted," such as "B corresponding to A," "B corresponding to A," "A and B corresponding," or "B and A corresponding," indicate that B and A have a corresponding relationship in shape, position, or function, and that B can be determined based on A. Determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information.

[0044] In this application, terms such as "center," "length," "width," "thickness," "top," "bottom," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," "outer," "axial," and "circumferential" indicate orientation or positional relationships based on the orientation or positional relationships shown in certain accompanying drawings, or based on the spatial posture of the product under normal use. Of course, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the location or original object must have a specific orientation, or a specific structure and operation. Therefore, they should not be construed as limitations on this application.

[0045] Example 1

[0046] See Figure 1 and Figure 2 One embodiment of this application provides a top-lit roller blind. Figure 1 This is a front view of a skylight roller blind. Figure 2 for Figure 1The side view on the right further illustrates its structure. The overhead light-transmitting roller blind includes a roller 5 and a curtain 6 connecting the roller 5. The roller 5 is equipped with movable pulleys at both ends. The overhead light-transmitting roller blind includes traction ropes and tension wheel assemblies symmetrically arranged on both sides.

[0047] The movable pulleys include movable pulley 11 and movable pulley 12 symmetrically connected to both ends of the reel 5. The movable pulleys are not rotatable relative to the reel 5; they can only rotate synchronously. The movable pulleys and the reel 5 can be detachably connected. The traction ropes include traction ropes 21 and 22 that respectively cooperate with movable pulleys 11 and 12. The tensioning pulley assembly includes a first tensioning pulley assembly and a second tensioning pulley assembly that respectively cooperate with traction ropes 21 and 22. The first tensioning pulley assembly includes tensioning pulleys 31 and 32, and the second tensioning pulley assembly includes tensioning pulleys 33 and 34.

[0048] The traction rope on each side of the overhead light-transmitting roller blind has a fixed first end and a fixed second end. Specifically, the upper and lower ends of the traction rope on each side are fixed to form a first end and a second end, respectively. Among them, the first end and the second end of the traction rope 21 that is coupled to the movable pulley 11 are fixed ends 41 and 42, respectively, and the first end and the second end of the traction rope 22 that is coupled to the movable pulley 12 are fixed ends 43 and 44, respectively.

[0049] The following text is in the format of Figure 1 Taking the right side as an example, the winding method of the traction rope is explained in detail. The traction rope 21 passes around the movable pulley 11 from below from the first end 41 to form an upward lifting section 211 that pulls the movable pulley 11 upward. The traction rope 21 passes around the movable pulley 11 from above from the second end 42 to form a downward pulling section 212 that pulls the movable pulley 11 downward. After the upward lifting section 211 passes around the first tensioning wheel 31, it is connected to the downward pulling section 212 that passes around the second tensioning wheel 32. The tensioning wheel assembly acts on the traction rope 21 to keep it in a taut state.

[0050] The overhead light-transmitting roller blind includes a drive mechanism that rotates a tension wheel on one side, for example... Figure 1 The tension wheel 31 on the right side is connected to a drive mechanism 7 that drives its rotation. The drive mechanism can be a motor, a manual sprocket, or other power device. When the drive mechanism is activated, it drives the movable pulley 11 to rise and fall while rotating. Since the movable pulleys on both sides are coaxially connected to the roller 5, the power is transmitted through the roller 5, and the movable pulley 12 at the other end can rise and fall synchronously while rotating.

[0051] When the tension wheel 31 rotates under the action of the drive mechanism 7, the tension wheel 31 drives the traction rope 21 to drive the movable pulley 11 to rotate. Since the two movable pulleys are coaxially and fixedly connected to both ends of the reel 5, the movable pulley 11 transmits its rotation to the reel 5 and the movable pulley 12 on the opposite side. The reel 5 and the movable pulley 12 on the opposite side will also rotate synchronously, while simultaneously winding the traction rope 22, causing the movable pulley 12 to rise and fall synchronously. The whole system achieves horizontal balanced raising and lowering of the reel, while the reel rotates simultaneously.

[0052] When the roller spool 5 rises horizontally, its rotation is configured to release the curtain 6, closing the roller blind upwards. When the roller spool 5 descends horizontally, its rotation is configured to retract the curtain 6, opening the roller blind downwards to achieve upward lighting. When the diameters of the pulleys on both sides are approximately the same as those of the roller spool 5, the lower end of the curtain 6 can remain essentially stationary during retraction and release.

[0053] In this embodiment, the top-lit roller blind uses tensioned traction ropes fixed at both ends to make the roller shaft rise and fall horizontally and rotate simultaneously, thereby achieving the top-lit effect of the roller blind. The overall structure is simple, the operation is reliable and smooth, and it is simple and lightweight.

[0054] The traction rope can be a beaded chain, and the tension pulley and movable pulley can be sprockets that cooperate with the beaded chain. The tension pulley assembly includes a first tension pulley and a second tension pulley, meaning that the movable pulley on the same side is stabilized by the upper and lower tension pulleys on each side. For example, Figure 1 The first tension wheel assembly on the right side includes tension wheel 31 and tension wheel 32, and each tension wheel can use a fixed pulley.

[0055] Example 2

[0056] Chinese patent document ZL201810513089.X discloses a technical solution where "the traction rope and traction device are symmetrically arranged, and the traction devices on both sides are coaxially connected." According to this solution, the axial direction of the tension wheel and the axial direction of the movable pulley can only be coaxially connected if they are arranged parallel to each other. This allows for synchronous operation on both sides by connecting symmetrical winders or drive wheels via a dedicated transmission rod. This not only requires the installation of a transmission rod but is also very difficult. When side rails are installed, their width needs to be increased; insufficient width will cause the traction rope to twist, potentially leading to friction between the upward and downward traction ropes, resulting in less smooth system operation. Since this invention eliminates the need for a dedicated transmission rod, improvements can be made in this embodiment to address the above-mentioned drawbacks.

[0057] In one embodiment, the axes of the tensioning pulley and the movable pulley are at an angle of 70-110 degrees, meaning their axes are approximately perpendicular to each other. This arrangement makes the installation structure of the overhead light-transmitting roller blind more compact, avoids twisting of the traction rope, and makes the entire system operate more smoothly.

[0058] like Figure 3 As shown, there is a 90-degree angle between the axes of the tensioning pulley 31 and the movable pulley 11.

[0059] Example 3

[0060] like Figure 4 As shown, the drive mechanism uses a manual sprocket, and the manual sprocket 35 is connected to the tension wheel 31 via a connecting mechanism 36. Figure 5 As shown, pulling the bead chain 23 drives the manual sprocket 35 to rotate, which in turn drives the tension wheel 31 to rotate via the connecting mechanism 36, further driving the entire roller blind system. To prevent the movable pulley from rotating under the weight of the curtain fabric and causing the tension wheel 31 to also rotate, the connecting mechanism 36 can be a planetary gear reduction mechanism or a spring anti-rotation mechanism. Both planetary gear reduction mechanisms and spring anti-rotation mechanisms are commonly used anti-rotation mechanisms in existing roller blinds and are well-known to those skilled in the industry. In existing roller blinds, this connecting mechanism is used to directly connect the manual sprocket and one end of the roller shaft. However, in this invention, this connecting mechanism connects between the manual sprocket and the driving tension wheel.

[0061] Example 4

[0062] like Figure 6 As shown, the overhead light-transmitting roller blind comprises two layers of transparent panels 8, with the roller 5 and curtain 6 positioned between the two layers of transparent panels 8. In this configuration, the overhead light-transmitting roller blind forms an adjustable overhead light-transmitting screen.

[0063] Example 5

[0064] like Figure 8 As shown, the top-lit roller blind includes two mirror-arranged guide rails 82. Each guide rail has a lifting cavity 821 that is clearance-fitted with a movable pulley, and a driving cavity 822 that is clearance-fitted with a tensioning wheel assembly. The clearance fit between the lifting cavity 821 and the driving cavity 822 improves the stability of the roller 5's lifting and lowering. The lifting cavity has an opening slot 823 that allows the connection between the movable pulleys (movable pulleys 11 and 12) and the roller 5 to pass through. The movable pulleys on both sides and the roller 5 can be configured to have essentially the same diameter. In this case, the lower end of the curtain 6 can remain essentially stationary during the rolling up and down process, achieving top-lit illumination from the roller blind.

[0065] The first and second ends of the traction rope can be correspondingly fixed to the upper and lower top ends of the two lifting chambers 821 on both sides, respectively. The two lifting chambers 821 arranged in a mirror image are used to lift the movable pulley 11 and the movable pulley 12, respectively. The two drive chambers 822 arranged in a mirror image are used to assemble the first tensioning pulley assembly and the second tensioning pulley assembly, respectively. The figure shows the tensioning pulley 31 of the first tensioning pulley assembly and the tensioning pulley 33 of the second tensioning pulley assembly.

[0066] like Figure 7 As shown, in order to make the spatial structure more compact, the lifting cavity 821 and the driving cavity 822 partially intersect and overlap in the longitudinal space. Since the tension wheel and the movable pulley are at different heights on the guide rail, their operation will not interfere with each other. A more preferred design is that the lifting cavity 821 and the driving cavity 822 intersect and overlap vertically, which can keep the rotation axes of the movable pulley and the tension wheel perpendicular.

[0067] Example 6

[0068] In this invention, when the roller blind 5 is raised and lowered, the lower end of the curtain will rise and fall to a certain extent. In order to maintain the stability of the lower end of the curtain and increase the tension of the curtain 6, such as... Figure 8 As shown, a lower rod 61 is provided at the lower end of the curtain fabric, and an elastic connector 101 is provided between the lower rod 61 and the lower end of the guide rail 82. In some cases, the lifting range of the lower rod 61 is increased, in which case a sliding connector 102 is provided between the lower rod 61 and the guide rail 82, such as... Figure 9 As shown, the sliding connector 102 is connected to the lower curtain rod 61 on one side, and slides up and down within the opening groove 823 of the guide rail 82 on the other side. The sliding connector 102 stabilizes the lower end of the curtain, making it less susceptible to swaying in the wind.

[0069] The top-lit roller blinds provided in the embodiments of this application can provide light from above and can be used in many scenarios such as offices, hotels, and hospitals. After repeated testing, the structure is simple and lightweight, and the operation is smooth and reliable.

[0070] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0071] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A top lighting roller shade, characterized by, The upper light-shielding roller blind comprises two symmetrically arranged traction ropes and a tension pulley assembly on each side, each traction rope has a fixed first end and a second end, and each tension pulley assembly comprises a first tension pulley and a second tension pulley, the traction rope passes through the movable pulley from below at the first end to form an upward pulling section of the movable pulley, and the traction rope passes through the movable pulley from above at the second end to form a downward pulling section of the movable pulley, the upward pulling section is connected to the downward pulling section after passing through the first tension pulley and the second tension pulley, the upper light-shielding roller blind comprises a driving mechanism for driving one tension pulley to rotate, and when the driving mechanism operates, the movable pulley on one side rotates while lifting, and the movable pulley on the other side rotates while lifting synchronously through the roller.

2. The raised light shade according to claim 1, wherein, The angle between the axis of the tension pulley and the axis of the movable pulley is 70-110 degrees.

3. The raised light shade according to claim 1, wherein, The traction rope is a bead chain, and the tension pulley and the movable pulley are sprockets matched with the bead chain.

4. The raised light shade according to claim 1, wherein, The driving mechanism is a motor.

5. The raised light shade according to claim 1, wherein, The driving mechanism is a manual sprocket connected to the tension pulley through a connecting mechanism.

6. The raised light shade according to claim 5, wherein, The connecting mechanism is a planetary gear reduction mechanism or a spring anti-rotation mechanism.

7. The uplighting roller shade of claim 1, wherein, The roller and the curtain cloth are arranged between two layers of transparent plates.

8. The uplighting roller shade of claim 1, wherein, The roller and the curtain cloth are arranged between two layers of transparent plates.

9. The uplighting roller shade of claim 8, wherein, The roller and the curtain cloth are arranged between two layers of transparent plates.

10. The raised light shade according to claim 8, wherein, The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates. The roller and the curtain cloth are arranged between two layers of transparent plates.

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