Roller shutter structure

Abstract

The invention relates to a roller shutter structure. A roller shutter structure comprises a winding drum wound with curtain cloth, and a winding drum supporting piece, a torque assembly and an end supporting piece are arranged in the winding drum. The torque assembly enables the winding drum to bear torsion N; a force conversion part is arranged between the winding drum supporting piece and the end supporting piece, and the force conversion part can change the friction force F between the winding drum supporting piece and the end supporting piece by changing the pressure P in the axial direction; gravity G, torsion N and friction force F of the curtain cloth are simultaneously applied to the winding drum, N = G + / -F in the up-down movement process of the curtain cloth, and the curtain cloth is made to be static at any position without external force. The roller shutter structure can be installed by directly utilizing axial pressure, can adapt to installation of roller shutters with different widths and different fabrics, and is convenient to adjust and good in stability.

Description

Technical Field

[0001] This invention relates to a roller blind structure. Background Technology

[0002] One type of existing roller blind uses a beaded chain to wind the roller, and simultaneously uses the beaded chain to self-lock the roller at the desired position to fix the opening degree of the curtain. This type of roller blind requires force to pull the beaded chain during use, but this can easily cause the chain to break. Once the chain breaks, the roller blind can no longer be used. Furthermore, when the curtain is pulled down, the weight of the curtain exerts a certain torque on the roller, and during the self-locking process, the brake head constantly bears this torque, which can easily damage the brake head. This type of roller blind requires hanging a beaded chain or rope, which not only affects aesthetics but also poses a significant safety hazard as it can easily cause children to get tangled in it. Another type of roller blind is driven by a motor. The motor rotates, driving the roller, and simultaneously uses the motor shaft to limit the self-locking position of the roller. The weight of the curtain exerts a certain torque on the roller, and this torque acts entirely on the motor shaft, placing a huge load on the motor. Although there are structures that do not require external parts to raise and lower the roller blind, adjusting the balance of these roller blinds is too complex and inconvenient, lacks stability, and is also affected by the width of the window frame during installation. Summary of the Invention

[0003] This invention addresses the aforementioned problems by providing a roller blind structure that allows manual raising or lowering of the curtain to the desired position based on actual usage needs, with self-locking. During the self-locking process, the roller itself and the limiting components are not subjected to excessive torque, thus preventing irreversible damage. Furthermore, it eliminates the need for drilling, allowing for direct installation using axial pressure. This structure is adaptable to roller blinds of different widths and fabrics, and offers convenient adjustment and good stability.

[0004] The objective of this invention is mainly achieved through the following solution: a roller blind structure, comprising a roller with a curtain fabric wound on it, roller support members provided at both ends inside the roller, the roller support members rotating synchronously with the roller. Inside the drum, there is also a torque component that applies a torque N to the drum. At the same time, end supports are provided at both ends of the drum, and at least one end of the end support is provided with a force adjustment component, which adjusts the axial pressure P between the end support and the wall surface. A force conversion component is provided between the drum support and the end support. The force conversion component can change the frictional force F between the drum support and the end support by changing the axial pressure P. The roller is simultaneously subjected to the weight G, torque N, and friction F of the curtain. During the up-and-down movement of the curtain, N=G±F, allowing the curtain to remain stationary at any position without any external force.

[0005] Once the curtains are installed, the force-converting components are under load, generating predictable rotational resistance, which acts as a brake on the roller blind.

[0006] The end support component and the roller support component are rotatable relative to each other. A force conversion component is placed between them, which provides a control mechanism for the rotational friction between the two components. Specifically, the axial pressure P is adjusted by the force adjustment component, thereby changing the magnitude of the friction force F, allowing the roller blind to achieve force balance even with different fabric installations. Simultaneously, the adjustment component also allows the roller blind to be installed to accommodate different window frame widths, firmly securing both ends of the roller blind to the wall. Installation and friction adjustment can be completed in a single operation, making it simple to use.

[0007] The curtain is wound onto a roller. When the curtain needs to be wound upwards, the curtain is pushed upwards, and the external force breaks the balance of torque, friction, and gravity. The roller rotates, causing the curtain to wind onto it and retract. Once the curtain is wound in place, the external force is removed, and the curtain is rebalanced by torque, friction, and gravity, remaining stationary. When the curtain needs to be pulled down, the same process occurs when the curtain is wound upwards. An external force breaks the balance, causing the curtain to move. Once the position is determined, the torque of the spring, the friction between the end support and the roller support, and the weight of the hanging portion of the curtain reach equilibrium, automatically locking the curtain at the desired position. The entire roller blind can be pulled down according to actual usage needs. After being pulled down to the desired position, it automatically locks. During the locking process, the torque of the spring, the friction between the end support and the roller support, and the weight of the hanging portion of the curtain reach equilibrium, preventing other components of the roller blind from being overloaded.

[0008] Preferably, the force conversion component includes rolling elements and pressure plates located on both sides of the rolling elements. The two pressure plates are respectively connected to the drum support and the end support. The pressure plates can be integral with the drum support and the end support, or they can be separate structures. The rolling elements between the two pressure plates can be rollers or balls. This allows the drum support and the end support to rotate relative to each other. However, when the two pressure plates are subjected to axial force, the friction between the pressure plates and the rolling elements increases, thereby increasing the friction between the drum support and the end support, which is used to adjust the force changes on the drum.

[0009] Preferably, the force conversion component is a planar thrust bearing disposed between the drum support and the end support. The torque assembly includes a spring providing torque, with both ends of the spring fixed to the inner ring of the drum and the end support at one end, respectively. Because the drum and the end support rotate relative to each other, the spring twists and generates torque when the drum rotates. The adjustment component can be placed at both ends or only at one end. To facilitate the installation and arrangement of the spring, the adjustment component can be placed at one end, while a spool can be connected to the end support at the other end, where no adjustment component is placed, and then the spring is sleeved on the spool. The planar thrust bearing has a simple structure and can convert the axial force acting on it into frictional force. The planar thrust bearing is sleeved on the end support, which has a groove in which a retaining ring is installed, abutting against the end face of the drum support. Through the force conversion component, force conversion is achieved while also providing support for the spool, improving the stability of the structure. The structure is simple. The relative positions of the end support and the drum support are fixed by the cooperation of the slot and the retaining ring, which facilitates assembly and adjustment. The end support is a cylinder with an annular end face, which facilitates the installation of the planar thrust bearing. The annular end face positions the planar thrust bearing.

[0010] Preferably, the adjusting component includes a pressure adjusting component and a clamping component, with the pressure adjusting component and the clamping component threadedly connected. When the pressure adjusting component is rotated, the clamping component moves axially, contacting the wall surface. The axial pressure P between the end support component and the wall surface changes with the axial movement of the pressure adjusting component. At the end with the adjusting component, the clamping component is in contact with the wall surface; at the end without the adjusting component, the end support component is in contact with the wall surface. However, after the adjusting component adjusts the axial pressure, the end support component at the other end is also pressed against the wall surface, resulting in axial pressure on both sides of the roller shutter. This axial pressure is transmitted to the force conversion component. After the force conversion component is subjected to axial pressure, the friction between the relatively rotatable end support components and the roller support component on both sides of the force conversion component increases, thereby adjusting the force on the roller. The pressure adjusting component and the clamping component are threadedly connected, so rotating the pressure adjusting component is sufficient to press the clamping component against the wall. Meanwhile, the cylindrical part of the second end support has a cavity inside, which can be used to install an axial preload spring. The axial preload spring abuts against the clamping part to provide preload for the installation of the clamping part. Then, the pressure adjustment part is used to tighten it, so that the roller can be installed on window frames of different widths.

[0011] Preferably, the torque assembly includes a spool and a coil spring sleeved on the spool. The spool is located inside a drum. One end of the coil spring is fixed, and the other end rotates with the drum. A coil spring preload adjustment device is also provided inside the drum. The preload adjustment device includes a preload adjuster and a stop. The stop is fixed to the spool and limits the travel of the preload adjuster. The preload adjuster is radially fixed to the drum. As the drum rotates, the coil spring relaxes or tightens, thereby changing the torque.

[0012] During pre-tensioning, first insert the adjusting member and the stop member into the drum. The adjusting member is now in contact with the stop member and cannot move relative to it. Then, rotate the inner ring of the drum, which fixes one end of the coil spring, to tighten the coil spring, giving it a pre-tension force. After tightening, when placing the inner ring of the coil spring, the drum shaft, the coil spring, the end support member (without the adjusting member), and the drum support member into the drum, because the adjusting member is relatively fixed to the drum, and the stop member is fixed to the drum shaft, the drum will not move when the drum shaft is stationary. Therefore, the coil spring installed in the drum is in a pre-tensioned state. When operating the curtain, the adjusting member disengages from the stop member and moves axially with the drum.

[0013] Preferably, a compression spring is provided between the stop and the preload adjustment component. A gap is left between the stop and the adjustment component. When the preload is too large or unsuitable, the rotating drum drives the adjustment component to move further towards the stop, further compressing the compression spring. The rotation of the drum drives the inner ring of the coil spring to rotate, thereby loosening the coil spring by a few turns and reducing the preload.

[0014] Preferably, the stop component includes a stop plate and a screw rod. A nut, serving as a preload adjustment element, is fitted onto the screw rod. The stop plate and screw rod are integrally formed. One end between the stop plate and screw rod is a smooth shaft, on which a compression spring is fitted. One end of the compression spring abuts against the nut, and the other end abuts against the stop plate. The integrally formed structure is simple and easy to install. The smooth shaft design allows the nut to rotate freely after being removed from the screw rod, while also providing support. After the preload adjustment is completed, the compression spring re-engages the nut against the threaded section. The screw and nut assembly is structurally simple. The screw provides the nut, acting as an adjustment element, with sufficient travel space.

[0015] Preferably, when the curtain is fully wound onto the drum, a pretensioning belt is installed outside the curtain. The length of the pretensioning belt is proportional to the pretensioning force on the drum. Before use, the pretensioning belt is pulled to pretension the torque assembly inside the drum.

[0016] Preferably, the preload of the assembled torque assembly can be manually adjusted, leaving a gap between the roller blind and the window frame. The roller can be manually rotated to tighten or release the spring torque of the torque assembly inside the roller.

[0017] Preferably, the bottom of the curtain fabric on the roller has a bottom rod cavity, within which multiple layers of bottom rod pieces are installed. These bottom rod pieces are curved. The curved pieces offer good strength and are easily formed into straight pieces, preventing the bottom rod pieces from tilting. The multi-layered structure of the bottom rod allows customers to easily cut it to fit the width of their windows, simplifying the process.

[0018] Therefore, the roller blind structure of the present invention has the following advantages: the entire roller blind can be pulled down according to actual usage needs, and after being pulled down to the desired position, it can automatically lock. During the locking process, the torque of the coil spring, the friction between the end support and the roller support, and the weight of the hanging part of the curtain are balanced, preventing other parts of the roller blind from being subjected to load; moreover, no drilling is required, allowing for direct installation, and the axial pressure of the end caps at both ends is converted into balancing friction. The roller blind does not require pre-tensioning and can be pre-tensioned by a pre-tensioning device or manually, facilitating the transportation of the roller blind. Attached Figure Description

[0019] Figure 1 This is an exploded view of one structure of the present invention.

[0020] Figure 2 yes Figure 1 A cross-sectional view with the curtain fabric removed.

[0021] Figure 3 yes Figure 1 A three-dimensional view of the end support member at the first end.

[0022] Figure 4 yes Figure 2 Enlarged view of point A in the middle.

[0023] Figure 5 This is a three-dimensional view of the end support component at the second end.

[0024] Figure 6 This is a perspective view of removing the roller and curtain in Example 2.

[0025] Figure 7 This is a 3D view of the adjustment component.

[0026] Figure 8 This is a 3D view of the stop component.

[0027] Figure 9 This is an exploded view of Example 3.

[0028] Figure 10 This is a cross-sectional view of Example 3 with the curtain removed.

[0029] Figure 11 This is a schematic diagram of Example 4. Detailed Implementation

[0030] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0031] Example 1: like Figure 1 and 2 As shown, a roller blind structure includes a roller 1, on which a curtain 50 is wound. A bottom rod is integrally formed at the bottom end of the curtain 50. The bottom rod includes a bottom rod cavity 11 and several bottom rod pieces 12 located in the bottom rod cavity 11. The bottom rod pieces are arc-shaped pieces with a certain curvature.

[0032] Cylindrical drum support members 2 are inserted into both ends of the drum 1. The outer circumferential surface of the drum support member 2 is formed with raised ribs, which, through an interference fit with the inner wall of the drum 1, ensure synchronous rotation between the drum support member 2 and the drum 1. A cavity is provided at the center of the drum support member 2, and a through hole is opened at the bottom of the cavity. An end support member is inserted into the through hole. The end support member includes a shaft-shaped section and a positioning member located at one end of the shaft-shaped section. A planar thrust bearing 10 is sleeved on the shaft-shaped section, with both ends of the planar thrust bearing 10 contacting the end face of the positioning member of the end support member and the bottom surface of the cavity of the drum support member, respectively. A retaining groove is provided on the shaft-shaped section of the end support member, and a retaining ring is installed in the groove to fix the relative position of the drum support member and the end support member.

[0033] like Figure 3 As shown, a spool 5 is installed at the center of the spool 1. One end of the spool 5 is fixed to the end support 6 at the first end. The shaft-like component of the end support 6 at the first end includes two sections, one of which is a first optical shaft section 16. A slot 15 is formed on the first optical shaft section 16 to fix the retaining ring 20. A support rib condition 14 is formed on one side of the first optical shaft section 16. The support rib condition 14 forms a cylinder that connects with the inner ring of the spool support 2. A planar thrust bearing 10 abuts against the end face of the support rib condition 14. An end face plate 13 is formed on one side of the support rib condition 14. A pressure pad 9 is installed in the end face plate 13 and connects to the wall. A tapered thread section is formed on the other side of the first optical shaft section 15 to facilitate the installation of the coil spring. A spool hole 17 is opened at the center of the end support of the first section. The spool hole 17 is an irregularly shaped hole as shown in the figure. When the spool rotates, it drives the end support of the first end to rotate.

[0034] A coil spring 3, providing torque, is sleeved on the spool 5. One end of the coil spring 3 is fixed to the end support 6 at the first end, and the other end of the coil spring 3 is fixed to the inner ring 4 of the drum. The inner ring 4 is sleeved on the spool 5, but does not rotate synchronously with the spool 5. The outer circumferential surface of the inner ring 4 is formed with raised ribs, which, through an interference fit with the inner wall of the drum 1, ensure that the inner ring 4 rotates synchronously with the drum 1.

[0035] like Figure 4 and5 As shown, the second-end end support 7 is a movable end support, coaxial with the drum support 2 at this end. The second-end end support 7 includes a second optical axis section 22, with an annular positioning disk 23 formed at one end of the second optical axis section 22. A planar thrust bearing 10 is sleeved on the second optical axis section 22 inside the drum support 2, and the planar thrust bearing 10 is in contact with both the positioning disk 23 and the bottom surface of the cavity of the drum support 2. A groove 15 is formed on the second optical axis section, and a retaining ring 20 is installed in the groove 15 to determine the relative position of the drum support 10 and the second-end end support 7.

[0036] A cavity is formed within the end support member at the second end, and a preload spring 19 is installed within the cavity. The preload spring 19 is sleeved on a stud 18, which is inserted into the cavity from one end of the end support member 7 at the second end. One end of the preload spring 19 abuts against the bottom of the cavity, and the other end abuts against the end face of the clamping member 21. The clamping member 21 includes a threaded section and an end face plate, and a pressure pad 9 is installed within the end face plate. The outer circumferential surface of the threaded section is threaded, and the cross-section of the threaded section is racetrack-shaped. A clamping member insertion hole 24 is formed at the center of the positioning plate 23 of the end support member 7 at the second end, and the shape of the clamping member insertion hole 24 is the same as the cross-sectional shape of the threaded section. A pressure adjusting member 8 is installed between the positioning plate 23 and the end face plate. The pressure adjusting member 8 includes a threaded connection section and a rotating plate. The rotating plate is located outside the drum support member, and the end face plate is located inside the rotating plate. The end face of the threaded connection abuts against the positioning plate 23 of the end face support of the second end. A threaded hole is opened in the center of the threaded connection section. The clamping member 21 passes through the threaded hole of the pressure adjusting member 8, and the clamping member 21 is threadedly connected to the pressure adjusting member 8. Rotating the rotating plate of the pressure adjusting member 8 causes the clamping member 21 to move axially, pressing the pressure pad top 9 against the wall. At the same time, the pressure adjusting member 8 generates an axial thrust on the end support 7 of the second end. The thrust acts on the planar thrust bearing 10, thereby changing the magnitude of the frictional force F between the planar thrust bearing 10 and the end support 7 and the drum support 2.

[0037] In use, because the bottom of the curtain and the bottom rod are made of thin sheets, the bottom rod can easily pass through the gap between the curtain and the window frame. Initially, the roller can be manually rotated to apply force to the spring inside. Then, by adjusting the pressure adjustment device, the curtain can be installed according to the length of the window frame. Simultaneously, axial pressure acts on the planar thrust bearing 10, increasing the friction between the end supports on both sides of the planar thrust bearing and the roller support. According to the force analysis on the roller, it is simultaneously subjected to the weight G of the curtain, torque N, and friction F. With a constant torque, a higher friction prevents the roller blind from rotating with the roller. Therefore, during the up-and-down movement of the curtain, N=G±F, achieving the function of raising and lowering the roller blind without external ropes. At the same time, the axial tensioning device allows the roller blind to be installed without drilling.

[0038] Example 2: like Figure 6 As shown, unlike Embodiment 1, a spring preload adjustment device is installed on the spool. The spring preload adjustment device includes a preload adjustment member 26 and a stop member 25.

[0039] like Figure 7 As shown, the pre-tightening adjusting member 26 is cylindrical, with evenly distributed raised ribs 29 formed on its outer circumferential surface. The raised ribs 29 are press-fitted with the inner wall of the drum 1, ensuring that the pre-tightening adjusting member 26 rotates synchronously with the drum 1. A through hole is formed in the center of the adjusting member, and a thread 28 is formed at one end of the through hole. A wedge-shaped fixing protrusion 27 is formed on the end face of the adjusting member.

[0040] like Figure 8 As shown, the stop member 25 includes a stop plate 30 and a screw 33 integrally formed with the stop plate 30. The screw 33 passes through the through hole of the pre-tightening adjustment member 26, and the pre-tightening adjustment member 26 is threadedly connected to the screw 33. A shaped hole, as shown in the figure, is formed in the center of the stop member. A spool 5 is inserted into the shaped hole to ensure that the spool 5 and the stop member 25 rotate synchronously. A radial fixing hole 31 is formed on the stop plate 30, and the stop member 25 is fixed to the spool 5 by screws. A groove 34 is formed on the end face of the stop plate 30. The groove 34 cooperates with the fixing protrusion 27 on the adjustment member. When the pre-tightening adjustment member 26 moves onto the stop member 25, the relative position of the two is fixed by the cooperation of the groove 34 and the fixing protrusion 27, ensuring that the pre-tightening adjustment member 26 can no longer rotate.

[0041] When installing the roller 5 into the drum 1, first align the adjusting piece with the groove and fixing protrusion of the stop plate, and fix them relative to each other. Then, place it into the drum 1, rotate the inner ring 4 of the drum to pre-tighten the coil spring 3, and after pre-tightening, place the roller 5, the end support 1 at the first end, and the drum support 2 into the drum 1. Then, install the roller blind onto the window frame. Then, pull the blind up and down. When the blind rises to the top, the nut also abuts against the stop plate, at which point the coil spring has pre-tightening force. The drum will not continue to rotate due to the coil spring.

[0042] Example 3: like Figure 9 and 10 As shown, unlike Embodiment 2, the section between the stop plate and the screw is a light shaft 32, on which a compression spring 37 is sleeved. One end of the compression spring 37 abuts against the preload adjustment member 26, and the other end of the compression spring 37 abuts against the stop plate 30.

[0043] When the roller blind is too wide, the user can manually cut off the excess length of the roller and fabric. In this case, the preload provided by the spring inside the roller is no longer suitable for the cut blind structure, requiring manual adjustment of the preload. At this point, the nut is held in place by the compressed spring and will not rotate; therefore, the roller cannot move. To adjust the spring preload, the roller can be manually rotated, causing the nut to compress the spring. This moves the nut from the threaded section to the smooth shaft section, where it is no longer constrained, allowing the spring preload to be adjusted. After adjustment, the roller is rotated in the opposite direction, returning the nut to the threaded rod and limiting the next movement of the roller.

[0044] Example 4: like Figure 11 As shown, a pre-tensioning band 38 is adhered to the outside of the curtain fabric. The length of the pre-tensioning band 38 is designed according to the required pre-tensioning force. When the spring on the roller has no pre-tensioning force, manually pulling the pre-tensioning band 38 causes the curtain fabric and roller to rotate. The bottom rod 21 at the bottom of the curtain fabric is flat, and its thickness is less than the distance from the top of the wound curtain fabric to the upper mounting surface 39. Therefore, when the pre-tensioning band is pulled, the bottom rod 40 can pass through the gap above, and pulling the pre-tensioning band drives the roller to rotate, thus achieving pre-tensioning of the coil spring. The number of rotations of the roller is determined by the length of the pre-tensioning band, which in turn determines the magnitude of the pre-tensioning force.

[0045] The specific embodiments described herein are merely illustrative of the concept of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A roller blind structure, comprising a roller (1) with a curtain fabric wound around it, characterized in that: Inside the drum (1), there are drum support members (2) at both ends, and the drum support members (2) rotate synchronously with the drum (1); Inside the drum (1), there is also a torque component that subjectes the drum to a torque N. At the same time, end supports are provided at both ends of the drum (1), and at least one end of the end support is provided with a force adjustment component, and the axial pressure P between the end support and the wall is adjusted by the force adjustment component. A force conversion component is provided between the drum support (2) and the end support. The force conversion component can change the frictional force F between the drum support and the end support by changing the pressure P in the axial direction. The roller is simultaneously subjected to the weight G, torque N, and friction F of the curtain. During the up-and-down movement of the curtain, N=G±F, allowing the curtain to remain stationary at any position without any external force.

2. The roller blind structure according to claim 1, characterized in that: The force conversion component includes a rolling element and pressure plates located on both sides of the rolling element. The two pressure plates are respectively connected to the drum support and the end support.

3. The roller blind structure according to claim 1, characterized in that: The force conversion component is a planar thrust bearing (10) disposed between the drum support (2) and the end support. The torque assembly includes a spring that provides torque, with the two ends of the spring fixed to the inner ring (4) inside the drum and the end support at one end, respectively.

4. A roller blind structure according to claim 1, characterized in that: The force adjustment component includes a pressure adjustment component (8) and a clamping component (21). The pressure adjustment component (8) and the clamping component (21) are threaded together. When the pressure adjustment component (8) is rotated, the clamping component (21) moves axially and is in contact with the wall. The axial pressure P between the end support and the wall changes with the axial movement of the pressure adjustment component (8).

5. A roller blind structure according to claim 1, characterized in that: The torque assembly includes a spool (5) and a coil spring (3) sleeved on the spool (5). The spool (5) is located inside the drum (1). One end of the coil spring (3) is fixed, and the other end of the coil spring (3) rotates with the drum (1). A coil spring preload adjustment device is also provided inside the drum. The coil spring preload adjustment device includes a preload adjustment member (26) and a stop member (25). The stop member (25) is fixed on the spool (5). The stop member limits the travel of the preload adjustment member (26). The preload adjustment member (26) is radially fixed to the drum (1).

6. A roller blind structure according to claim 5, characterized in that: A compression spring is provided between the stop (25) and the preload adjustment (26).

7. A roller blind structure according to claim 5, characterized in that: The stop (25) includes a stop plate (30) and a screw (33). A nut serving as a preload adjustment component (26) is sleeved on the screw (33). The stop plate (30) and the screw (33) are integrally formed. One end between the stop plate (30) and the screw (33) is a light shaft (32). A compression spring (37) is sleeved on the light shaft (32). One end of the compression spring (37) abuts against the nut, and the other end of the compression spring (37) abuts against the stop plate (30).

8. A roller blind structure according to claim 1, characterized in that: When the curtain is fully wound onto the drum, a pretensioner is installed outside the curtain. The length of the pretensioner is proportional to the pretension force on the drum. Before use, the pretensioner is pulled to pretension the torque assembly inside the drum.

9. A roller blind structure according to claim 1, characterized in that: The preload of the assembled torque assembly can be manually adjusted. A gap is left between the roller blind and the window frame. The roller is manually rotated to tighten or release the spring torque of the torque assembly inside the roller.

10. A roller blind structure according to claim 1, characterized in that: The bottom of the curtain on the roller is provided with a bottom rod cavity, and multiple layers of bottom rod pieces are installed in the bottom rod cavity. The bottom rod pieces are arc-shaped pieces.

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