Balanced driving system and roller shutter comprising same

Abstract

The utility model discloses a balance driving system and a roller shutter comprising the same. The balance driving system comprises a fixing column, a receiving spool, a base, a spring assembly, an output spool and a transmission rope. The receiving bobbin is connected with the fixing column. And the base is clamped with the reel pipe and can rotate relative to the fixed column. The output spool and the spring assembly are arranged on the base and connected with each other, so that the output spool constantly bears an elastic force moment. And the transmission rope is wound on the receiving spool and / or the output spool and is kept in a tensioning state. When the stress of the curtain body is released, a receiving coil is formed when the transmission rope is wound on the receiving wire shaft by one circle; when the curtain body is stressed to be rolled up, the transmission rope is wound on the output wire shaft by one circle to form an output coil. The radiuses of the receiving coils and / or the output coils are gradually increased in the winding process, so that the downward pulling force of the weight of the shutter body acting on the reel pipe is balanced when the rolling shutter stops being stressed.

Description

Technical Field

[0001] This utility model relates to a balance drive system, and more particularly to a balance drive system applied to roller blinds, which enables the roller blind to come to a stop immediately after the external force is removed from the curtain after the curtain is moved by the external force. Background Technology

[0002] The operation of a cordless roller blind involves directly pulling down the curtain or pushing the end of the curtain upwards to retract it onto the roller. When the user stops pulling down or pushing up, the end of the curtain stops moving and remains stationary at its current position. Therefore, the user can unfold the curtain to any length and position it accordingly. The operating principle of a cordless roller blind utilizes a helical spring engaged with the roller. This helical spring is twisted and accumulates elasticity when the curtain is pulled down, and releases this elasticity when the end of the curtain is pushed up, allowing the user to easily retract the curtain onto the roller. Furthermore, when the user stops pulling down or pushing up, the elasticity of the helical spring also acts as a balancing torque to counteract the load and tension exerted on the roller by the weight of the curtain, helping the cordless roller blind maintain its position after the pulling down or pushing up action stops, preventing the curtain from unexpectedly rolling upwards or unfolding downwards after the user stops applying force. However, the material and manufacturing costs of helical springs are relatively high. Furthermore, the coil spring itself has a certain length, making it unsuitable for custom-sized curtains with narrower fabric widths.

[0003] To replace the coil spring, one design utilizes a more readily manufactured and inexpensive spiral spring, reversed in an S-shape and fixed to two rotating wheels as a power output module. This module is connected to the roller via a bevel gear mechanism to provide balancing torque. However, during each operation of a cordless roller blind, the user may want to stop the curtain end at different arbitrary positions, resulting in varying curtain unfolding lengths and requiring different balancing torques. This is because for roller blinds, the longer the curtain unfolds, the greater the load exerted on the roller by the curtain's weight. The coil spring can increase its twist as the curtain unfolds and release greater elasticity when the user stops applying force, achieving a balancing effect on the load tension and allowing the curtain end to come to rest. However, the balancing torque provided by the spiral spring-based power output module is approximately constant and cannot change accordingly with different curtain unfolding degrees. Other mechanisms must be included to balance the load tension variations caused by different curtain unfolding degrees. Therefore, there is room for improvement in the drive system of cordless roller blinds made with low-cost spiral springs. Utility Model Content

[0004] In view of the above-mentioned existing problems, one of the objectives of this utility model is to provide a balanced drive system and a roller blind including the same, which overcomes the problem that when a cordless roller blind uses a spiral spring instead of a helical spring, it cannot provide a corresponding balancing force to the roller according to the different degrees of unfolding of the curtain, and thus cannot achieve the operation of keeping the end of the curtain stationary at any position.

[0005] According to the purpose of this utility model, a balancing drive system and a roller blind including the same are provided. The roller blind includes a roller tube, a curtain body, and the balancing drive system, wherein the roller tube is fixed to a building by two supports respectively provided at its two ends and can rotate about a first axis. The balancing drive system includes a fixed post, a receiving spool, a base, a driving rotating component, a spiral spring, an output spool, and a transmission rope. The fixed post is provided at one end of the roller tube and connected to one of the two supports, and the fixed post cannot rotate relative to the corresponding support. The receiving spool is connected to the fixed post and has a first central axis, which is parallel to the first axis. The base is disposed in the cavity of the roller tube, engages the roller tube, and can rotate synchronously with the roller tube. The driving rotating component is rotatably disposed on the base relative to the base. One end of the spiral spring is fixed to the driving rotating component and is wound around or released from the driving rotating component depending on the different rotation directions of the driving rotating component. The output spool has a second central axis and is rotatably mounted on the base relative to the base. The output spool is movably connected to a drive rotating member to withstand a constant spring torque provided by the spiral spring.

[0006] The first end of the drive rope is fixed to a receiving spool, and the second end is fixed to an output spool. The drive rope is wound around at least one of the receiving and output spools and kept taut. Each turn of the drive rope on the receiving spool forms a receiving coil, and when the curtain is completely released from the roller tube, the drive rope forms multiple receiving coils on the receiving spool. Each turn of the drive rope on the output spool forms an output coil, and when the curtain is completely wound onto the roller tube, the drive rope forms multiple output coils on the output spool. The radius of the receiving coils and / or the output coils gradually increases during the winding process.

[0007] In one embodiment of this invention, the spring torque provided by the spiral spring to the output spool provides an upward force to the curtain body through the output spool, drive rope, receiving spool, and winding tube. The upward force increases with the length of the curtain body released and decreases with the length of the curtain body released. Simultaneously, at least the weight of the curtain body released from the winding tube generates a downward force acting on the winding tube; this downward force increases with the length of the curtain body released and decreases with the length of the curtain body released. When the curtain body is moved to any position by an external force and the external force is removed, the absolute value of the difference between the downward force and the upward force is always less than a system static friction force, causing the winding tube to come to rest. The system static friction force includes the frictional forces generated between at least the fixed post, the receiving spool, the drive rotating component, and the output spool, and between the winding tube and the two supports, which exhibit relative rotation when the curtain body is wound onto or released from the winding tube.

[0008] A receiving force arm is defined as the orthogonal distance from the position of the drive rope leaving the receiving spool to the first central axis; an output force arm is defined as the orthogonal distance from the position of the drive rope leaving the output spool to the second central axis. In one embodiment of this invention, when an external force is applied to cause the curtain to roll up or unroll, the winding tube rotates around the first axis and drives the base to rotate synchronously, causing a relative rotational motion between the receiving spool and the base. This results in the drive rope being pulled out from one of the receiving spool and the output spool and wound around the other. Simultaneously, the output spool rotates around the second central axis under the action of the rope tension and the elastic torque of the drive rope. As the length of the curtain that is released increases, the receiving force arm gradually increases, and the output force arm gradually decreases; conversely, as the length of the curtain that is released decreases, the receiving force arm gradually decreases, and the output force arm gradually increases.

[0009] In another embodiment of this utility model, as the length of the curtain released increases, the receiving lever arm gradually increases while the length of the output lever arm remains unchanged; as the length of the curtain released decreases, the receiving lever arm gradually shortens while the length of the output lever arm remains unchanged.

[0010] In another embodiment of this utility model, as the length of the curtain released increases, the length of the receiving lever arm remains constant while the length of the output lever arm gradually shortens; as the length of the curtain released decreases, the length of the receiving lever arm remains constant while the length of the output lever arm gradually increases.

[0011] In one embodiment of this invention, the receiving spool is fixedly connected to a fixing post and has a receiving groove. The receiving groove is annular and centered on a first central axis. The receiving groove restricts the drive rope from stacking to the next layer every X turns on the receiving spool. When the curtain is completely released from the roller tube, the stacked receiving coils formed by the drive rope on the receiving spool create multiple overlapping layers. During the application of the external force, the number of these receiving coils changes with the length of the curtain being released, thus changing the number of overlapping layers and consequently altering the length of the receiving lever arm. Preferably, X is 1, 2, or 3.

[0012] In one embodiment of this invention, the second central axis of the output spool is orthogonal to the first axis, and the output spool has an annular output groove centered on the second central axis. The output groove restricts the transmission rope from being stacked to the next layer every Y turns on the output spool, and when the curtain is completely wound onto the roller tube, the output coils formed by the transmission rope wound on the output spool form multiple stacked layers. During the application of the external force, the number of these output coils changes with the length of the curtain being released, thereby causing a change in the number of stacked layers and thus a change in the length of the output lever arm. Preferably, Y is 1, 2, or 3.

[0013] In one embodiment of this invention, the base includes two end faces facing each other. The receiving spool and the output spool each have their two ends rotatably mounted on the two end faces, such that the second central axis of the output spool is parallel to the first axis. The end of the fixing post extending into the winding tube cavity has a splined shaft portion. The receiving spool has a gear portion that meshes with the splined shaft portion of the fixing post. When an external force is applied to cause the curtain to retract or unfold, the gear portion of the receiving spool moves along the periphery of the splined shaft portion of the fixing post, causing the receiving spool to rotate relative to the base about the first central axis.

[0014] In one embodiment of this utility model, the receiving spool includes a conical cylinder centered on a first central axis and a receiving groove. The receiving groove is spirally distributed on the conical cylinder so that the transmission rope is wound around the receiving spool along the receiving groove. The transmission rope starts to wind around the conical cylinder from the end of the receiving groove near the small diameter end of the conical cylinder, so that the radius of the receiving coils gradually increases during the winding process, thereby creating a positive relationship between the length of the receiving lever arm and the release length of the curtain.

[0015] In one embodiment of this utility model, the output spool includes a tapered cylinder centered on a second central axis and an output groove. The output groove is spirally distributed on the tapered cylinder so that the transmission rope is wound around the output spool along the output groove. The transmission rope starts to wind around the tapered cylinder from the end of the output groove near the small diameter end of the tapered cylinder, so that the radius of the output coils gradually increases during the winding process, thereby making the length of the output lever arm have an inverse relationship with the curtain release length.

[0016] In a preferred embodiment of the present invention, the center of mass of the receiving spool, the base, the driving rotating member, the spiral spring, and the output spool is located on the first axis.

[0017] The present invention discloses a balance drive system and a roller blind containing the same, which replaces the existing helical spring system of roller blinds with a spiral spring, and has the following advantages:

[0018] (1) Reduce material and manufacturing costs, but maintain the balance force that varies with the degree of curtain unfolding for cordless roller blinds, so that the roller blind can stop and remain still after being moved to any position, providing users with a good operating experience.

[0019] (2) The structure of the balance drive system of this utility model is conducive to compressing the total length of space occupied in the roller blind, and can be applied to small-width curtains of customized size.

[0020] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Attached Figure Description

[0021] Figure 1 The first embodiment of this utility model is a balance drive system and a roller shutter including the same.

[0022] Figure 2 for Figure 1 A partial exploded view of the roller shutter.

[0023] Figure 3 for Figure 2 A partial three-dimensional cross-sectional view of the balance drive system in the diagram.

[0024] Figure 4 for Figure 2 The balance drive system in the image is shown in a stereoscopic view from another perspective, with the fixed column omitted.

[0025] Figure 5 for Figure 4 The exploded view of the balance drive system is shown, and the fixed column is also omitted.

[0026] Figure 6 for Figure 4 Balanced drive system along Figure 4 The diagram shows a front view of one side of the balance drive system, omitting the fixed column.

[0027] Figure 7 for Figure 4 A schematic diagram of the receiving spool in the diagram.

[0028] Figure 8 for Figure 4 A schematic diagram of the output spool in the diagram.

[0029] Figure 9 for Figure 6 The diagram shows a cross-sectional view of the balance drive system along section AA, and illustrates the position of the drive rope on the receiving spool when the curtain is fully wound onto the reel.

[0030] Figure 10 for Figure 6 The partial sectional view of the balance drive system along the BB section line shows the winding status of the drive rope on the output spool when the curtain is fully wound onto the roller tube, omitting the display of the receiving spool.

[0031] Figure 11 for Figure 10 Enlarged view of the output spool and drive rope.

[0032] Figure 12 for Figure 9 From the same perspective, this is a schematic diagram showing the winding status of the drive rope on the receiving spool when the curtain has been completely released from the roller.

[0033] Figure 13 for Figure 10 From the same perspective, this is a schematic diagram showing the condition of the drive rope on the output spool when the curtain has been completely released from the roller.

[0034] Figure 14 for Figure 13 Enlarged view of the output spool and drive rope.

[0035] Figure 15 for Figure 1 The diagram shows the side view of the roller blind, omitting the side support.

[0036] Figure 16 A graph illustrating the relationship between the lifting force provided by the balance drive system of the first embodiment of this utility model and the downward pulling force of the applied roller blind and the release length of the blind.

[0037] Figure 17 This is a perspective view of the balance drive system of the second embodiment of the present invention, showing the winding state of the drive rope on the receiving spool and the output spool when the curtain is completely rolled up on the roller tube.

[0038] Figure 18 for Figure 17 The balancing drive system in the image is viewed from a different perspective in a stereoscopic view.

[0039] Figure 19 for Figure 18 A partial cross-sectional view of the balance drive system in the image.

[0040] Figure 20for Figure 17 A schematic diagram of the structure of the fixed column.

[0041] Figure 21 for Figure 17 A schematic diagram of the structure of the second base component of the base.

[0042] Figure 22 for Figure 17 A schematic diagram of the receiving spool in the diagram.

[0043] Figure 23 for Figure 17 A schematic diagram of the output spool and the driving rotating component.

[0044] Figure 24 for Figure 17 The diagram shows a cross-sectional view of the balance drive system along the CC section line, and illustrates the winding status of the spiral spring on the drive rotating component and the spring storage column when the curtain is fully rolled up on the roller tube.

[0045] Figure 25 for Figure 17 The diagram shows a cross-sectional view of the balance drive system along the DD section line, and illustrates the winding status of the drive rope on the receiving and output spools when the curtain is fully wound onto the roller tube.

[0046] Figure 26 for Figure 18 The diagram shows a three-dimensional view of the balanced drive system, and illustrates the winding status of the drive rope on the receiving and output spools when the curtain has been completely released from the roller.

[0047] Figure 27 for Figure 26 The diagram shows a cross-sectional view of the balance drive system along the EE section line, and illustrates the winding status of the spiral spring on the drive rotating component and the spring storage column when the curtain has been completely released from the roller tube.

[0048] Figure 28 for Figure 26 The diagram shows a cross-sectional view of the balance drive system along the FF section line, and illustrates the winding status of the drive rope on the receiving and output spools when the curtain has been completely released from the reel.

[0049] Figure 29 A graph illustrating the relationship between the lifting force provided by the balance drive system of the second embodiment of the present invention, the pulling force of the applied roller blind, and the release length of the blind.

[0050] Figure 30 This is a perspective view of the balance drive system according to the third embodiment of this utility model.

[0051] Figure 31 for Figure 30Cross-sectional view of the balance drive system along the GG section line.

[0052] In the attached figures, the following labels are used:

[0053] 101: Pin

[0054] 102: Gearbox

[0055] 200: Roller blind

[0056] 202: Rolled Tube

[0057] 2021: Hollow Convex Pillar

[0058] 204: Curtain

[0059] 205, 206: Bracket

[0060] 208: Lower beam

[0061] 210: Sleeve

[0062] 210a: Connector

[0063] 10: Balanced Drive System

[0064] 11,21: Fixed Column

[0065] 111,211: Card slot

[0066] 212: Spline shaft

[0067] 12, 22, 32: Receiving spools

[0068] 121, 221, 321: Receiving cable tray

[0069] 222: Gear section

[0070] 223: First stop disc

[0071] 224: Second stop disc

[0072] 225: Conical cylinder

[0073] 226: End rod

[0074] 13,23,33: Base

[0075] 131: Engaging rib

[0076] 132: Protrusion

[0077] 133: Steering Components

[0078] 231, 331: First base component

[0079] 2311: First end face

[0080] 2312: Engaging groove

[0081] 232,332: Second base component

[0082] 2321: Second end face

[0083] 2321a: Mounting hole

[0084] 2322: Engaging notch

[0085] 2323: Spring Storage Pillar

[0086] 14, 24, 34: Drive rotating components

[0087] 15, 35: Spring storage wheel

[0088] 16, 25, 36: Spiral springs

[0089] 17, 26, 37: Output spools

[0090] 171: Cylinder

[0091] 172: Gear Disc

[0092] 1711,261: Output cable tray

[0093] 262,372: First limiting disk

[0094] 263,373: Second limiting disk

[0095] 264: Tapered Cylinder

[0096] 265: End Post

[0097] 374:Right cylinder

[0098] 375: Bevel gear section

[0099] 18, 27, 38: Transmission rope

[0100] 181,271: First end

[0101] 182,272: Second end

[0102] 183,273: Output coil

[0103] 184,274: Receiving coil

[0104] 39: Transmission wheel

[0105] 391: First Gear

[0106] 392: Second Gear

[0107] Ao,Ao': Output lever arm

[0108] Ar,Ar': Receiving force arm

[0109] C1, C1': First central axis

[0110] C2,C2',C2”: Second central axis

[0111] D1: First Direction

[0112] D2: Second Direction

[0113] Fd: Pull-down force

[0114] Fs: Static friction force of the system

[0115] Fu, Fu': lifting force

[0116] I: Initial value

[0117] P: Location

[0118] R1: First axis line

[0119] R2, R2': Second axis

[0120] S: Side view Detailed Implementation

[0121] The following examples, in conjunction with the accompanying drawings, further illustrate this utility model. Please refer to... Figure 1 and Figure 2In the first embodiment of this utility model, the balancing drive system 10 is applied to a roller blind 200, which includes a roller tube 202, a curtain body 204, two supports 205 and 206, a lower beam 208, and a sleeve 210. The roller tube 202 is an aluminum extrusion tube, with a hollow protrusion 2021 extending longitudinally from its inner circumferential surface to form a non-circular inner circumferential edge. The two supports 205 and 206 are respectively provided opposite to the two ends of the roller tube 202 to fix the roller tube 202 to the building, and the roller tube 202 can rotate relative to the two supports 205 and 206 about a first axis R1. One end edge of the curtain body 204 is connected to the roller tube 202, so that the curtain body 204 can be wound onto or released from the roller tube 202 in different rotation directions relative to the roller tube 202. In this embodiment, the curtain 204, other than the roller tube 202, is connected to the lower beam 208 at its other end, allowing the user to apply external force to move the other end of the curtain 204 to any position to adjust the desired light-blocking area. The balanced drive system 10 includes a fixed post 11, a receiving spool 12, a base 13, a drive rotating component 14, a spring storage wheel 15, a spiral spring 16, an output spool 17, and a transmission rope 18. The fixed post 11 has a slot 111 and is located at one end of the roller tube 202. The bracket 205 has a latch that inserts into the slot 111 of the fixed post 11, preventing the fixed post 11 from rotating relative to the bracket 205.

[0122] Please also refer to Figure 3 and Figure 7 One end of the receiving spool 12 is fixed to the fixing post 11, and the other end is rotatably connected to the base 13 via a pin 101. The receiving spool 12 has a first central axis C1 and a receiving groove 121. The orientation of the receiving spool 12 is such that the first central axis C1 is parallel to the first axis R1, and the parallelism includes both complete overlap and parallel but not overlapped states. The receiving groove 121 is annular and centered on the first central axis C1. In this embodiment, the fixing post 11 and the receiving spool 12 are presented as two independent components and cannot rotate relative to each other after assembly; in another embodiment, the fixing post and the receiving spool can also be integrally formed components, which can also achieve the function of not being able to rotate relative to each other.

[0123] Please also refer to Figures 2 to 5The base 13 is disposed within the cavity of the winding tube 202, and is generally rectangular in shape. It has multiple engaging ribs 131 and multiple protrusions 132 on its opposite sides, protruding outwards along a direction orthogonal to the first axis R1. The shape of each engaging rib 131 matches the hollow protrusion 2021 on the inner circumferential surface of the winding tube 202 and engages with both sides of the hollow protrusion 2021, thus preventing the base 13 from rotating arbitrarily within the winding tube 202. Furthermore, on the other side of the base 13, each protrusion 132 extends to abut against the inner circumferential surface of the winding tube 202, so that the engaging ribs 131 maintain a tight fit with the hollow protrusion 2021, thereby allowing the base 13 to rotate synchronously with the winding tube 202 relative to the fixing post 11 and the receiving spool 12. Figure 4 and Figure 5 As shown, the base 13 further includes a steering assembly 133. The steering assembly 133 is a roller, but not limited to this, as long as it has an arc-shaped structure, such as a metal shaft or an arc-shaped structure integrally formed with the base 13, and its function is to guide the extension direction of the transmission rope 18.

[0124] Please refer back to this. Figure 2 and Figure 3 The sleeve 210 is fitted onto the fixing post 11, and the outer circumferential surface of the sleeve 210 has a snap-fit ​​structure that engages with the hollow protrusion 2021 on the inner circumferential surface of the coil 202, allowing the sleeve 210 to rotate with the coil 202 and relative to the fixing post 11. The sleeve 210 is further fixed to the base 13 by a connector 210a. In another embodiment of the present invention, the sleeve and the connector are integrally formed. In yet another embodiment of the present invention, the shape of the fixing post can match the end of the coil on which the fixing post is located, eliminating the need for the sleeve and the connector.

[0125] Please see Figure 5 The driving rotating member 14 and the spring storage wheel 15 are rotatably mounted on the base 13, each being a rotating wheel. One end of the spiral spring 16 is fixed to the driving rotating member 14, and the other end is fixed to the spring storage wheel 15. In this embodiment, the spring storage wheel 15 is an idler wheel, and the driving rotating member 14 has a lower ring tooth (not shown) disposed on its bottom surface. As the driving rotating member 14 rotates in different directions, the spiral spring 16 unwinds from the spring storage wheel 15 and winds back onto the driving rotating member 14, or unwinds from the driving rotating member 14 and winds back onto the spring storage wheel 15. The spiral spring 16 is wound in opposite directions on the driving rotating member 14 and the spring storage wheel 15, forming an S-shape between them. The driving rotating member 14, the spring storage wheel 15, and the spiral spring 16 can be considered together as a spring assembly to continuously output a substantially constant elastic torque.

[0126] Please also refer to Figures 5 to 8 .like Figure 8 As shown, the output spool 17 has a second central axis C2. The output spool 17 also includes a cylindrical body 171 and a geared disc 172 integrally connected to the cylindrical body 171. An annular output cable groove 1711 is formed on the cylindrical body 171. (As shown...) Figure 5 As shown, the output spool 17 is rotatably mounted on the base 13 via a central column. Simultaneously, the gear 172 of the output spool 17 is connected to the lower ring gear (not shown) of the drive rotating member 14 via a speed-changing gear 102, ensuring that the output spool 17 is constantly subjected to the spring force torque provided by the spiral spring 16. In this embodiment, when the output spool 17 is mounted on the base 13, its second central axis C2 is perpendicular to the first axis R1.

[0127] See Figure 4 and Figure 5 The two ends of the drive rope 18 are fixed to the receiving spool 12 and the output spool 17, respectively. During the operation of the roller shutter 200, the drive rope 18 is wound around at least one of the receiving spool 12 and the output spool 17 and is always kept taut. After extending from the output spool 17, the drive rope 18 first winds around the arc surface of the steering assembly 133 of the base 13 and then extends to the receiving spool 12.

[0128] Here it is defined that the transmission rope 18 forms an output coil with each turn on the output spool 17, and that the transmission rope 18 forms a receiving coil with each turn on the receiving spool 12. This definition applies to all the following paragraphs and will not be repeated here.

[0129] Please also refer to Figures 8 to 11 ,in Figures 9 to 11 This shows the arrangement of the drive rope 18 on the receiving spool 12 and the output spool 17 when the curtain 204 is fully wound onto the winding tube 202. A first end 181 of the drive rope 18 (see...) Figure 9 The receiving groove 121 of the receiving spool 12 is fixed to the receiving spool 12, and the second end 182 of the transmission rope 18 is opposite to the first end 181 (see...). Figure 10The output wire groove 1711 is fixed to the output wire spool 17. When the curtain 204 is completely wound onto the winding tube 202, the drive rope 18 is approximately completely wound around the output wire groove 1711 of the output wire spool 17, forming multiple output coils 183. Furthermore, in this embodiment, the width of the output wire groove 1711 along the second central axis C2 is slightly larger than the diameter of the drive rope 18 but less than twice the diameter of the drive rope 18. This restricts the drive rope 18 from stacking to the next layer after each turn on the output wire groove 1711, allowing the output coils 183 to form multiple stacked layers around the bottom of the output wire groove 1711 as the axis, with the number of stacked layers corresponding to the number of output coils 183. The outermost layer of the output coil 183 has a larger radius. In other words, the radius of the output coils 183 increases sequentially with the order of winding to form the stacked layers.

[0130] Please see Figure 1 , Figure 2 and Figure 5When a user applies an external force to the curtain 204, causing the curtain 204 and the lower beam 208 to move to any position, the external force may cause the lower beam 208 to move upward, thus winding the curtain 204 onto the roller tube 202, or the lower beam 208 to move downward, thus releasing the curtain 204 from the roller tube 202. Taking the downward movement of the lower beam 208 as an example, the roller tube 202 will rotate around the first axis R1 in a first direction D1, driving the base 13 to rotate synchronously in the same direction, thus releasing the curtain 204, causing a relative rotational motion between the base 13 and the receiving spool 12. This relative rotational motion causes the transmission rope 18 to be pulled out from the output groove 1711 of the output spool 17 and wound onto the receiving groove 121 of the receiving spool 12. At this time, the external force causes the tension of the transmission rope 18 acting on the output spool 17 to be greater than the elastic torque borne by the output spool 17. Under the combined action of the rope tension and the elastic torque, the output spool 17 rotates in the positive direction around the second central axis C2, and drives the drive rotating member 14 to rotate, causing the spiral spring 16 to wind around the drive rotating member 14. On the other hand, when the external force causes the lower beam 208 to move upward, the external force causes the tension of the transmission rope 18 to decrease and become less than the elastic torque borne by the output spool 17. Then, the spiral spring 16 is unwound from the driving rotating member 14 and rolled back onto the spring storage wheel 15, driving the output spool 17 to rotate in the opposite direction around the second central axis C2. At the same time, under the combined action of the rope tension and the elastic torque, the transmission rope 18 is pulled out from the receiving groove 121 of the receiving spool 12 and rolled back onto the output groove 1711 of the output spool 17. This causes the base 13 and the receiving spool 12 to rotate relative to each other in another direction, causing the winding tube 202 to rotate around the first axis R1 in a second direction D2 and driving the base 13 to rotate synchronously and in the same direction and roll up the curtain 204.

[0131] Please see Figure 7 and Figures 12 to 14 ,in Figures 12 to 14This shows the configuration of the drive rope 18 on the receiving spool 12 and the output spool 17 when the curtain 204 is completely released from the winding tube 202. When the curtain 204 is completely released from the winding tube 202, the drive rope 18 is completely wound around the receiving groove 121 of the receiving spool 12 to form multiple receiving coils 184. In this embodiment, similar to the design of the output groove 1711, the groove width of the receiving groove 121 along the first central axis C1 is slightly larger than the diameter of the drive rope 18 but less than twice the diameter of the drive rope 18. This restricts the drive rope 18 from stacking to the next layer after each turn on the receiving groove 121, allowing the receiving coils 184 to form multiple overlapping layers around the bottom of the receiving groove 121, with the number of overlapping layers corresponding to the number of receiving coils 184. The outermost receiving coils 184 have a larger radius. In other words, the radius of the receiving coil 184 increases with each turn as the layers are wound to form the stacked layers.

[0132] Please refer back to this. Figures 9 to 14 The orthogonal distance from the position of the drive rope 18 away from the receiving spool 12 to the first central axis C1 is defined as a receiving force arm Ar, and the orthogonal distance from the position of the drive rope 18 away from the output spool 17 to the second central axis C2 is defined as an output force arm Ao. As described in the above paragraphs, as the curtain 204 is released from the winding tube 202, the drive rope 18 gradually unwinds from the output spool 17 and winds itself back onto the receiving spool 12. During this process, the number of output coils 183 gradually decreases, while the number of receiving coils 184 gradually increases. The decrease in the number of output coils 183 leads to a gradual decrease in the number of stacked layers, which in turn causes the orthogonal distance from the position of the drive rope 18 away from the output spool 17 to the second central axis C2 to gradually shorten, thus gradually shortening the length of the output force arm Ao. The increase in the number of receiving coils 184 leads to a gradual increase in the number of stacked layers, which in turn causes the orthogonal distance between the position of the transmission rope 18 away from the receiving spool 12 and the first central axis C1 to gradually increase, thus causing the length of the receiving force arm Ar to gradually increase. In short, as the length released by the curtain 204 increases, the length of the output force arm Ao gradually shortens, while the length of the receiving force arm Ar gradually increases.

[0133] Similarly, as described in the above paragraphs, as the curtain 204 is rolled back onto the winding tube 202, the drive rope 18 gradually unwinds from the receiving spool 12 and winds onto the output spool 17. During this process, the number of output coils 183 gradually increases, while the number of receiving coils 184 gradually decreases. The increase in the number of output coils 183 leads to a gradual increase in the number of stacked layers, which in turn causes the orthogonal distance from the position of the drive rope 18 away from the output spool 17 to the second central axis C2 to gradually increase, thus increasing the length of the output lever arm Ao. The decrease in the number of receiving coils 184 leads to a gradual decrease in the number of stacked layers, which in turn causes the orthogonal distance from the position of the drive rope 18 away from the receiving spool 12 to the first central axis C1 to gradually shorten, thus shortening the length of the receiving lever arm Ar. In short, as the length of the curtain 204 decreases, the length of the output force arm Ao gradually increases, while the length of the receiving force arm Ar gradually decreases.

[0134] Please also refer to Figure 2 , Figure 5 , Figure 15 and Figure 16 The balance drive system 10 of this invention uses the spring torque provided by the spiral spring 16 of the spring assembly to apply a vertically upward lifting force Fu to the curtain 204 through the output spool 17, the drive rope 18, the receiving spool 12, and the winding tube 202. When the external force that moved the lower beam 208 and the curtain 204 to any position is removed, the lifting force Fu can balance the downward pulling force Fd generated by at least the weight of the curtain 204 (especially the portion of the curtain 204 that has been released from the winding tube 202) and acting on the winding tube 202, causing the winding tube 202 to come to a stop. For example, the lifting force Fu and the downward pulling force Fd may act together at a position P after the curtain 204 has unwound from the winding tube 202 (see...). Figure 15 The downward force Fd is transmitted to the roller tube 202 through the rolled-up portion of the curtain body 204. It is known that for all roller blind types, the degree of curtain release is positively correlated with the magnitude of the downward torque exerted by the curtain weight on the roller. Therefore, when the external force that moved the lower beam 208 and the curtain body 204 to any position is removed, the longer the length of the curtain body 204 released, the greater the downward force Fd; the shorter the length of the curtain body 204 released, the smaller the downward force Fd. In this case, to ensure that the upward force Fu always balances the varying downward force Fd corresponding to the different lengths of the curtain body 204 released, the upward force Fu must be set to be as consistent as possible with the changing trend of the downward force Fd.

[0135] More specifically, after the external force that moved the lower beam 208 and the curtain 204 to any position is removed, the absolute value of the difference between the downward force Fd and the upward force Fu must be set to be less than a system static friction force Fs in order to make the roller tube 202 stop. The system static friction force Fs includes the friction between all the components of the roller blind 200 that are in contact with each other and have relative rotational motion during the process of the curtain 204 being moved by the external force and rolled onto or released from the roller tube 202, including but not limited to: the friction between the fixed post 11 and the sleeve 210, the friction between the receiving spool 12 and the base 13, the friction between each adjacent meshing pair in the output spool 17, the gear 102 and the drive rotating member 14, the friction between the transmission rope 18 and the steering assembly 133, the friction between the wound part and the unwound part of the curtain 204, etc. Furthermore, in this embodiment, since the lower edge of the curtain 204 is connected to the lower beam 208, the downward pulling force Fd also includes the force exerted by the weight of the lower beam 208 on the roller tube 202. Figure 16 In this context, the initial value I of the downward pulling force Fd represents the force exerted on the roller tube 202 by the weight of the lower beam 208 when the entire curtain 204 is wound around the roller tube 202.

[0136] In order to make the lifting force Fu vary with the release length of the curtain 204, the balance drive system of this invention makes at least one of the receiving force arm and the output force arm a variable force arm. The following will use a first embodiment to explain how the receiving force arm Ar and the output force arm Ao affect the magnitude of the lifting force Fu.

[0137] Please also refer to Figures 9 to 11 as well as Figure 16 The tension of the transmission rope 18 is affected by the downward force Fd and the receiving force arm Ar. Specifically, the value of the downward force Fd divided by the receiving force arm Ar is approximately the tension of the transmission rope 18. Furthermore, the rope tension and the output force arm Ao together generate a rope tension torque acting on the output spool 17. The direction of this rope tension torque is opposite to the direction of the elastic torque, and its magnitude is approximately the rope tension multiplied by the output force arm Ao. When the rope tension torque and the elastic torque are balanced, they together generate an upward force Fu on the reel 202. If the difference between the upward force Fu and the downward force Fd is less than a system static friction force Fs, or if the difference between the upward force Fu and the downward force Fd is less than the system static friction force Fs, then the reel 202 can come to rest after the external force is removed.

[0138] During the movement of the curtain 204 under the external force, the longer the length of the curtain 204 released, the longer the receiving force arm Ar becomes, suppressing the increase in the rope tension of the transmission rope 18. Simultaneously, the output force arm Ao shortens, suppressing the increase in the rope tension torque. Conversely, the shorter the length of the curtain 204 released, the shorter the receiving force arm Ar becomes, suppressing the decrease in the rope tension of the transmission rope 18. Simultaneously, the output force arm Ao lengthens, suppressing the decrease in the rope tension torque. In summary, the changes in the receiving force arm Ar and the output force arm Ao can suppress the trend of the rope tension torque increasing with the increase in the length of the curtain 204 released, and the trend of the rope tension torque decreasing with the decrease in the length of the curtain 204 released. In this way, regardless of when the external force is removed, the rope tension torque can be balanced with the elastic torque. The aforementioned balance refers to the fact that the difference between the upward force Fu provided by the elastic torque and the rope tension torque to the reel 202 and the downward force Fd is less than the static friction force Fs of the system, or the difference between the elastic torque and the rope tension torque and the downward force Fd is less than the static friction force Fs of the system. Therefore, after the external force is removed, the reel 202 can come to a complete stop, and the curtain 204 and the lower beam 208 will not experience any unexpected movement.

[0139] Please see Figure 16 In this embodiment, the radius of each of the output rope loops 184 and the receiving rope loops 183 changes after each loop or unloop, causing the lengths of the output lever arm Ao and the receiving lever arm Ar to change in a step-like manner relative to the length released from the curtain 204. Simultaneously, changes in the length of either the output lever arm Ao or the receiving lever arm Ar increase the upward force Fu. Therefore, the upward force Fu is positively correlated with the length released from the curtain 204 in a step-like manner, but this is not a limitation. In other embodiments, the upward force Fu may also be set to have a linear positive correlation or other non-linear positive correlation with the length released from the curtain 204.

[0140] In this embodiment, both the receiving arm Ar and the output arm Ao are variable arms. However, in other embodiments, setting only one of the receiving arm and the output arm as a variable arm and the other as a fixed arm can also achieve the effect of balanced drive. Furthermore, in this embodiment, the receiving groove 121 is designed to limit the transmission rope 18 from being stacked to the next stack layer after each turn on the receiving spool 12, and the output groove 1711 of the output spool 17 is designed to limit the transmission rope 18 from being stacked to the next stack layer after each turn, but this is not a limitation. The receiving groove 121 is defined to limit the transmission rope 18 from being stacked to the next layer after every X turns on the receiving spool 12, and the output groove 1711 is defined to limit the transmission rope 18 from being stacked to the next layer after every Y turns on the output spool 17. The number of stacked layers formed by X and the receiving coils 184 on the receiving spool 12, and the number of stacked layers formed by Y and the output coils 183 on the output spool 17, can be freely set according to the width, length, and weight of the curtain being used. Preferably, X is 1, 2, or 3, and / or Y is 1, 2, or 3.

[0141] The following describes another embodiment of this invention. In this embodiment, the output cable groove is designed to limit the transmission rope 18 to wrapping around the output spool three times before stacking to the next layer. Simultaneously, when the curtain 204 is fully retracted, the transmission rope 18 forms multiple stacked layers on the output spool. In other words, the output lever arm is a variable lever arm, and because the radius of the output coils changes at a low frequency, the change in the output lever arm is relatively gradual. Furthermore, the width of the receiving cable groove in this embodiment is designed to be much larger than the diameter of the transmission rope 18, so that the transmission rope 18 wraps around the receiving cable groove throughout the entire release of the curtain without creating any stacking on the receiving cable groove. In this way, the radius of the receiving coils formed by the transmission rope 18 winding around the receiving cable groove does not change with the winding sequence; that is, the receiving lever arm is a fixed lever arm. During the process of moving the curtain by applying the external force, the balance drive system of the embodiment adjusts the upward force solely by the change in the output lever arm, making its change trend approximate the change trend of the downward force. Furthermore, because the change range of the output lever arm is relatively small, the embodiment is suitable for roller blinds with narrow widths and long lengths. This is because when the roller blind is narrow or made of lightweight material, as the length of the curtain extends further, the downward force acting on the roller increases at a relatively slow rate. The balance drive system of the embodiment, due to the relatively gentle change range of its output lever arm, helps to provide an upward force similar to the change range of the downward force.

[0142] Please see Figures 17 to 19This illustrates a balancing drive system 20 according to a second embodiment of the present invention. The balancing drive system 20 includes a fixed column 21, a receiving spool 22, a base 23, a driving rotating component 24, a spiral spring 25, an output spool 26, and a transmission rope 27. This balancing drive system 20 can also be applied to applications such as... Figure 1 and Figure 2 The roller blind 20 shown applies a vertically upward lifting force Fu' to the blind body 204, and the balance drive system 20, like in the first embodiment, is disposed along the first axis R1 corresponding to one end of the roller tube 202. Therefore, when reading the following description of the second embodiment, please refer to it in conjunction with the description. Figure 1 and Figure 2 .

[0143] Please also refer to Figures 17 to 21 In this embodiment, the fixing post 21 has a slot 211 and is disposed at the end of the reel 202. The slot 211 engages with the bracket 205, preventing the fixing post 21 from rotating relative to the bracket 205. Furthermore, the end of the fixing post 21 extending into the cavity of the reel 202 has a splined shaft portion 212. The base 23 includes a separate first base component 231 and a second base component 232. The first base component 231 has a first end face 2311 and a locking groove 2312, which engages with the reel 202, allowing the first base component 231 to rotate with the reel 202. The second base component 232 has a second end face 2321, a locking recess 2322, and a spring storage post 2323. The second end face 2321 has a mounting hole 2321a. The engaging notch 2322 engages with the reel 202, allowing the second base component 232 to rotate together with the reel 202. The first end face 2311 of the first base component 231 and the second end face 2321 of the second base component 232 face each other.

[0144] Please see Figures 17 to 19 Please refer to the following as well. Figure 22 In this embodiment, the receiving spool 22 has a first central axis C1'. The receiving spool 22 also includes a receiving groove 221, a gear portion 222, a first stop disk 223, a second stop disk 224, a conical cylinder 225, and a two-end rod 226. The conical cylinder 225 is centered on the first central axis C1' and connected between the first stop disk 223 and the second stop disk 224. The receiving groove 221 is spirally distributed on the conical cylinder 225, and the starting and ending ends of the receiving groove 221 respectively abut against the second stop disk 224 and the first stop disk 223. The gear portion 222 connects to the first stop disk 223 and, as shown... Figure 18The spline shaft portion 212 that engages with the fixed post 21 is shown. The two-end rods 226 protrude outward from the gear portion 222 and the second stop disc 224, respectively, and are rotatably connected to the first end face 2311 and the second end face 2321.

[0145] Please see Figures 17 to 19 Please refer to the following as well. Figure 23 In this embodiment, the driving rotating member 24 is a cylinder integrally connected to one end of the output spool 26. The output spool 26 has a second central axis C2'. In this embodiment, the second central axis C2' is parallel to the first axis of the winding tube. The output spool 26 includes an output groove 261, a first limiting disk 262, a second limiting disk 263, a tapered cylinder 264, and an end post 265. The tapered cylinder 264 is centered on the second central axis C2' and connected between the first limiting disk 262 and the second limiting disk 263. The driving rotating member 24 is connected to the second limiting disk 263. The output groove 261 is spirally distributed on the tapered cylinder 264, and the starting end and the ending end of the output groove 261 respectively abut against the first limiting disk 262 and the second limiting disk 263. The end post 265 protrudes outward from the first limiting disk 262. The end post 265 and the second limiting disk 263 of the output spool 26 are rotatably connected to the mounting hole 2321a of the first end face 2311 of the first base component 231 and the second end face 2321 of the second base component 232, respectively, allowing the output spool 26 to rotate relative to the base 23 around the second central axis C2'. When the output spool 26 rotates around the second central axis C2', it drives the driving rotating member 24 to rotate relative to the base 23 around a second axis R2 parallel to the first axis R1. In this embodiment, the second axis R2 coincides with the second central axis C2'.

[0146] Please also refer to Figure 18 , Figure 19 and Figure 24 One end of the spiral spring 25 is fixed to the driving rotating member 24, and the other end is fixed to the spring storage column 2323 of the second base component 232. As the driving rotating member 24 rotates in different directions around the second axis R2, the spiral spring 25 unwinds from the spring storage column 2323 and winds back onto the driving rotating member 24, or unwinds from the driving rotating member 24 and winds back onto the spring storage column 2323. The spiral spring 25 is wound in opposite directions on the driving rotating member 24 and the spring storage column 2323, forming an S-shape between them. The driving rotating member 24, the spring storage column 2323, and the spiral spring 25 can be considered as a spring assembly, used to continuously output a substantially constant elastic torque to the output spool 26.

[0147] Please see Figure 18 , Figure 19 and Figure 25 Please refer to the following as well. Figures 26 to 28 The first end 271 of the transmission rope 27 (see...) Figure 25 The receiving groove 221 of the receiving spool 22 is fixed at the starting end, and the transmission rope 27 has a second end 272 opposite to the first end 271 (see...). Figure 28 The output cable 27 is fixed to the starting end of the output cable groove 261 on the output spool 26. During the operation of the roller shutter 200, the drive rope 27 is wound around at least one of the receiving spool 22 and the output spool 26 and is always kept taut. Figure 17 and Figure 25 As shown, when the curtain 204 is completely wound onto the roller tube 202, the drive rope 27 is completely wound around the output groove 261 of the output spool 26, forming multiple output coils 273. In this embodiment, the output groove 261 is spirally distributed on the tapered cylinder 264. The drive rope 27 is wound around the output spool 26 along the output groove 261, and the drive rope 27 begins to wind around the tapered cylinder 264 from the end of the output groove 261 near the small diameter end of the tapered cylinder 264. As the distribution path of the output groove 261 on the tapered cylinder 264 gradually moves away from the second central axis C2', the radius of the output coils 273 gradually increases during the winding process, and the change in the radius of the output coils 273 is continuous.

[0148] Please also refer to Figure 19 , Figure 24 and Figure 25When a user applies an external force to the curtain 204, causing it to move to any position, such as moving the lower beam 208 downwards to release the curtain 204, the roller 202 will rotate around the first axis R1 in the first direction D1, driving the first base component 231 and the second base component 232 to rotate synchronously and in the same direction relative to the fixed post 21. At this time, the receiving spool 22 is driven by the first base component 231 and the second base component 232, causing the gear part 222 to move along the periphery of the spline shaft part 212 of the fixed post 21. The reaction force of the spline shaft part 212 on the gear part 222 generates a torque, driving the receiving spool 22 to rotate around the first central axis C1' in the first direction D1, resulting in a relative rotational motion between it and the base 23. The relative rotational motion causes the transmission rope 27 to be pulled out from the output groove 261 of the output spool 26 and wound onto the receiving groove 221 of the receiving spool 22. At this time, the external force causes the tension of the transmission rope 27 acting on the output spool 26 to be greater than the elastic torque borne by the output spool 26. Under the combined action of the rope tension and the elastic torque, the output spool 26 is driven to rotate in the positive direction around the second central axis C2', and drives the drive rotating member 24 integrally connected to it to rotate around the second axis R2, so that the spiral spring 25 is wound around the drive rotating member 24.

[0149] On the other hand, when the external force causes the lower beam 208 to move upward, the external force causes the tension of the transmission rope to decrease and become less than the elastic torque of the spiral spring 25 of the spring assembly acting on the output spool 26. Under the combined action of the rope tension and the elastic torque, the spiral spring 25 is released from the driving rotating member 24 and wound around the spring storage column 2323, causing the driving rotating member 24 and the output spool 26 integral with it to rotate in the opposite direction around the second central axis C2', pulling the transmission rope 27 out from the receiving groove 221 of the receiving spool 22 and winding it back onto the output groove 261 of the output spool 26. At this time, the receiving spool 22 is driven by the first base component 231 and the second base component 232, causing the gear portion 222 to move along the periphery of the spline shaft portion 212 of the fixed column 21. This drives the receiving spool 22 to rotate around the first central axis C1' in the second direction D2, resulting in a relative rotational motion between it and the base 23 in another direction. Simultaneously, the first base component 231 and the second base component 232 rotate synchronously and in the same direction relative to the fixed column 21, driving the winding tube 202 to rotate around the first axis R1 in the second direction D2, thereby winding the curtain 204 onto the winding tube 202.

[0150] Please see Figures 26 to 28When the curtain 204 has been completely released from the roller, the drive rope 27 is completely wound around the receiving groove 221 of the receiving spool 22 to form multiple receiving coils 274. In this embodiment, the receiving groove 221 is spirally distributed on the conical cylinder 225. The drive rope 27 is wound around the receiving spool 22 along the receiving groove 221, and the drive rope 27 begins to wind around the conical cylinder 225 from the end of the receiving groove 221 near the small diameter end of the conical cylinder 225. As the distribution path of the receiving groove 221 on the conical cylinder 225 gradually moves away from the first central axis C1', the radius of the receiving coils 274 gradually increases during the winding process, and the change in the radius of the receiving coils 274 is continuous.

[0151] Please see Figure 18 , Figure 25 , Figure 26 and Figure 28 The orthogonal distance from the position of the transmission rope 27 away from the receiving spool 22 to the first central axis C1' is defined as a receiving force arm Ar' (see...). Figure 25 And define the orthogonal distance from the position of the transmission rope 27 leaving the output spool 26 to the second central axis C2' as an output lever arm Ao' (see...). Figure 28 As described in the preceding paragraphs, as the curtain 204 is released from the winding tube 202, the drive rope 27 gradually unwinds from the output spool 26 and winds itself onto the receiving spool 22. During this process, the position of the drive rope 27 leaving the output groove 261 gradually approaches the second central axis C2' on the tapered cylinder 264 of the output spool 26, while the position of the drive rope 27 entering the receiving groove 221 gradually moves away from the first central axis C1' on the conical cylinder 225 of the receiving spool 22. In other words, as the length of the curtain 204 released increases, the length of the output lever arm Ao' gradually shortens, while the length of the receiving lever arm Ar' gradually increases.

[0152] Similarly, as described in the above paragraphs, as the curtain 204 is rolled back onto the winding tube 202, the drive rope 27 gradually unwinds from the receiving spool 22 and winds onto the output spool 26. During this process, the position of the drive rope 27 leaving the receiving groove 221 gradually approaches the first central axis C1' on the conical cylinder 225 of the receiving spool 22, while the position of the drive rope 27 entering the output groove 261 gradually moves away from the second central axis C2' on the tapered cylinder 264 of the output spool 26. In other words, as the length of the curtain 204 released decreases, the length of the output lever arm Ao' gradually increases, while the length of the receiving lever arm Ar' gradually decreases.

[0153] Please also refer to Figure 1 , Figure 2 as well as Figures 17 to 29 The balancing drive system 20 causes the spring torque provided by the spiral spring 25 of the spring assembly to apply a vertically upward lifting force Fu' to the curtain 204 through the output spool 26, the drive rope 27, the receiving spool 22, and the winding tube 202. Figure 29 As shown, the absolute value of the difference between the downward pulling force Fd and the upward force Fu' is less than the static friction force Fs of the system. Therefore, when the external force that moved the lower beam 208 and the curtain 204 to any position is removed, the upward force Fu' can balance the downward pulling force Fd generated by the weight of the curtain 204 and acting on the winding tube 202, causing the winding tube 202 to come to rest. In this embodiment, both the output spool 26 and the receiving spool 22 have a gradually tapering shape, causing the spiral grooves distributed on them to guide the winding radius of the transmission rope 27 to change continuously during the winding process. More specifically, the output coils 273 formed by the transmission rope 27 wound on the output groove 261 of the output spool 26, and the receiving coils 274 formed by the transmission rope 27 wound on the receiving groove 221 of the receiving spool 22, wherein the radius of each output coil 273 or receiving coil 274 changes continuously during the winding or unwinding process, that is, the length of the output lever arm Ao' and the receiving lever arm Ar' changes linearly, so that the lifting force Fu' is also linearly positively correlated with the length of the curtain 204 released.

[0154] In this embodiment, the base 23 includes a separate first base component 231 and a second base component 232, and the first end face 2311 and the second end face 2321 facing each other are respectively located on the first base component 231 and the second base component 232, but this is not a limitation. In another embodiment of this invention, the base is a single body and has a recessed portion. The recessed portion has two sidewalls facing each other. The first end face and the second end face are respectively located on the two sidewalls, and the receiving spool and the output spool are disposed therebetween.

[0155] Please see Figure 30 and Figure 31This illustration shows a balance drive system according to a third embodiment of the present invention. In this embodiment, the balance drive system 30 includes a fixed column, a receiving spool 32, a base 33, a drive rotating component 34, a spring storage wheel 35, a spiral spring 36, an output spool 37, a transmission rope 38, and a transmission wheel 39. The receiving spool 32 is generally tapered and has a receiving groove 321 spirally distributed thereon. The base 33 includes a first base component 331 and a second base component 332. The main differences between this embodiment and the second embodiment lie in the different structures of the spring assembly and the different shapes and configurations of the output spool 37.

[0156] In this embodiment, the output spool 37 includes a first limiting disk 372, a second limiting disk 373, a straight cylinder 374, and a bevel gear portion 375. The straight cylinder 374 is a cylindrical body of equal diameter connected between the first limiting disk 372 and the second limiting disk 373. The bevel gear portion 375 is connected to the second limiting disk 373, and the second limiting disk 373 is rotatably mounted on the second base component 332.

[0157] In this embodiment, the output spool 37 is a spring assembly consisting of the drive rotating member 34, the spring storage wheel 35, and the spiral spring 36, connected by the transmission wheel 39. The drive rotating member 34, the spring storage wheel 35, and the transmission wheel 39 are each rotatably mounted on the second base component 332 of the base 33. The transmission wheel 39 further includes a first gear 391 and a second gear 392. The first gear 391 meshes with the bevel gear portion 375 of the output spool 37, and the second gear 392 meshes with the drive rotating member 34. With this configuration, the output spool 37 is movably connected to the drive rotating member 34. When the output spool 37 rotates, it drives the drive rotating member 34 to rotate relative to the second base component 332 about a second axis R2' orthogonal to the first axis R1, thereby winding or releasing the spiral spring 36.

[0158] In this embodiment, when the transmission rope 38 unwinds from the output spool 37 and winds onto the receiving groove 321 of the receiving spool 32, or unwinds from the receiving groove 321 of the receiving spool 32 and winds onto the output spool 37, the transmission rope 38 directly unwinds from or winds onto the straight column 374 of the output spool 37 and is confined between the first limiting disk 372 and the second limiting disk 373. Furthermore, the position of the transmission rope 38 on the straight column 374 of the output spool 37 always maintains an equidistant relationship with the second central axis C2". Therefore, in this embodiment, the output force arm is a fixed force arm. The balance drive system 30 adjusts the lifting force solely by changing the receiving force arm, making its changing trend approximate the changing trend of the downward force.

[0159] In a preferred embodiment of this invention, the center of mass of the receiving spool, the base, the driving rotating component, the spiral spring, and the output spool is located on the first axis R1. This configuration allows the components to operate more stably when the curtain 204 is subjected to the external force, avoiding swaying during the operation of the roller blind 200 that could cause a jerky feel or noise.

[0160] The above description is only an embodiment of this utility model. Any equivalent changes made by applying the specification and claims of this utility model should be included within the patent scope of this utility model.

[0161] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the claims of this utility model.

Claims

1. A balanced drive system suitable for a roller blind, the roller blind having a roller tube and a curtain body, the roller tube being fixed to a building by two supports respectively disposed at its two ends and rotatable about a first axis, one end edge of the curtain body being connected to the roller tube so that the curtain body can be wound onto or released from the roller tube, characterized in that, The balance drive system includes A fixed post is provided at one end of the reel and connected to one of the two supports, and the fixed post cannot rotate relative to the corresponding support. A receiving spool is connected to the fixed post and has a first central axis, which is parallel to the first axis. A base is provided in a cavity of the tube, which is snapped into the tube and can rotate synchronously with the tube; A drive rotating component is rotatably disposed on the base relative to the base; A spiral spring, one end of which is fixed to the driving rotating component, winds around the driving rotating component or is released from the driving rotating component as the driving rotating component rotates in different directions. An output spool having a second central axis and rotatably mounted on the base relative to the base, the output spool being movably connected to the drive rotating member to withstand a spring torque constantly provided by the spiral spring; and A drive rope has a first end and a second end opposite to the first end. The first end is fixed to a receiving spool, and the second end is fixed to an output spool. The drive rope is wound around at least one of the receiving spool and the output spool and maintained in a taut state. Each turn of the drive rope on the receiving spool forms a receiving coil, and when the curtain is completely released from the roller tube, the drive rope is wound around the receiving spool to form a plurality of receiving coils. Each turn of the drive rope on the output spool forms an output coil, and when the curtain is completely wound onto the roller tube, the drive rope is wound around the output spool to form a plurality of output coils. The radius of at least one of the receiving coils and the output coils gradually increases during the winding process.

2. The balancing drive system according to claim 1, characterized in that, The elastic torque provides an upward force to the curtain body through the output spool, the drive rope, the receiving spool, and the winding tube. The upward force increases as the length of the curtain body released increases, and decreases as the length of the curtain body released decreases. At least the weight of the curtain body released from the winding tube generates a downward pulling force on the winding tube. The downward pulling force increases as the length of the curtain body released increases, and decreases as the length of the curtain body released decreases. When the curtain body is wound onto or released from the winding tube, frictional forces exist between at least the fixed post, the receiving spool, the drive rotating component and the output spool, and between the winding tube and the two supports, which are in relative rotation. At least these frictional forces constitute a system of static friction. When the curtain body is moved to any position by an external force and the external force is removed, the absolute value of the difference between the downward pulling force and the upward force is always less than the system of static friction, causing the winding tube to come to rest.

3. The balancing drive system according to claim 1, characterized in that, A first orthogonal distance from the position of the drive rope away from the receiving spool to the first central axis is defined as a receiving force arm, and a second orthogonal distance from the position of the drive rope away from the output spool to the second central axis is defined as an output force arm. When an external force is applied to cause the curtain to be wound onto or released from the roller tube, the roller tube rotates around the first axis and drives the base to rotate synchronously. At this time, a relative rotational motion is generated between the receiving spool and the base, and the drive rope is pulled out from one of the receiving spool and the output spool and wound onto the other. At the same time, the output spool rotates around the second central axis under the action of the rope tension and the elastic torque of the drive rope. As the length of the curtain released increases, at least the receiving force arm gradually increases or the output force arm gradually decreases; as the length of the curtain released decreases, at least the receiving force arm gradually decreases or the output force arm gradually increases.

4. The balancing drive system according to claim 3, characterized in that, The receiving spool is fixed to the fixed post and has a receiving groove, which is annular and centered on the first central axis. The second central axis of the output spool is orthogonal to the first axis, and the output spool has an output groove that is annular and centered on the second central axis. The receiving groove restricts the drive rope from stacking to the next layer every X turns on the receiving spool. When the curtain is completely released from the roller, the receiving coils formed by the drive rope on the receiving spool stack to form multiple layers. During the application of the external force, the number of receiving coils changes with the length of the curtain being released. This leads to a change in the number of stacked layers, causing the first orthogonal distance to gradually shorten or increase accordingly, thus changing the length of the receiving force arm; the output groove restricts the transmission rope from being stacked to the next layer every Y turns on the output spool, and when the curtain is completely rolled up on the roller tube, the output coils formed by the transmission rope being wound on the output spool form multiple stacked layers; during the application of the external force, the number of output coils changes with the length of the curtain being released, thus causing a change in the number of stacked layers, causing the second orthogonal distance to gradually shorten or increase accordingly, thus changing the length of the output force arm.

5. The balancing drive system according to claim 4, characterized in that, X is 1, 2, or 3, and Y is 1, 2, or 3.

6. The balancing drive system according to claim 2, characterized in that, The base further includes a steering assembly having an arc surface, through which the drive rope, after leaving the output spool, first passes the arc surface of the steering assembly and then extends to the receiving spool.

7. The balancing drive system according to claim 6, characterized in that, The frictional force that constitutes the static friction of the system also includes the frictional force between the drive rope and the steering assembly.

8. The balancing drive system according to claim 3, characterized in that, The base further includes two end faces facing each other, and the two ends of the receiving spool are rotatably disposed on the two end faces; the two ends of the output spool are rotatably disposed on the two end faces, and the second central axis of the output spool is parallel to the first axis; one end of the fixing post extending into the cavity of the winding tube has a spline shaft portion, and the receiving spool has a gear portion that meshes with the spline shaft portion of the fixing post; when the external force is applied, the gear portion of the receiving spool moves along the periphery of the spline shaft portion of the fixing post and the receiving spool rotates around the first central axis.

9. The balancing drive system according to claim 8, characterized in that, The receiving spool includes a conical cylinder and a receiving groove. The conical cylinder is centered on the first central axis, and the receiving groove is spirally distributed on the conical cylinder so that the transmission rope can be wound around the receiving spool along the receiving groove. The transmission rope starts to be wound around the conical cylinder from the receiving groove near the small diameter end of the conical cylinder.

10. The balancing drive system according to claim 8, characterized in that, The output spool includes a tapered cylinder and an output groove. The tapered cylinder is centered on the second central axis. The output groove is spirally distributed on the tapered cylinder so that the transmission rope can be wound around the output spool along the output groove. The transmission rope starts to be wound around the tapered cylinder from the end of the output groove near the small diameter end of the tapered cylinder.

11. The balancing drive system according to claim 8, characterized in that, The drive rotating component can rotate relative to the base about a second axis parallel to the first axis, and the second axis coincides with the second central axis.

12. The balancing drive system according to claim 8, characterized in that, It further includes a transmission wheel, which is rotatably mounted on the base and has a first gear and a second gear. The output spool has a bevel gear portion that meshes with the first gear of the transmission wheel. The driving rotating member is rotatable relative to the base about a second axis orthogonal to the first axis and meshes with the second gear of the transmission wheel. The output spool is movably connected to the driving rotating member through the transmission wheel.

13. The balancing drive system according to claim 8, characterized in that, The base further includes a separate first base component and a second base component, each of which engages with the reel, and the two end faces of the base are respectively located on the first base component and the second base component.

14. The balancing drive system according to claim 1, characterized in that, The receiving spool, the base, the driving rotating component, the spiral spring, and the output spool all have a common center of mass located on the first axis.

15. A roller blind, characterized in that, It includes: a roller tube that can rotate about a first axis and is fixed to a building by two brackets respectively provided at the two ends of the roller tube; a curtain body whose one end edge is connected to the roller tube so that the curtain body can be rolled up on the roller tube or released from the roller tube. And the balance drive system as described in any one of claims 1 to 14.

Images